研究者総覧
永廣 秀子NAGAHIRO Hidekoナガヒロ ヒデコ
| ■所属部署名 | 研究院自然科学系物理学領域 | |||
| ■職名 | 准教授 | |||
Last Updated :2024/04/15
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プロフィール情報
姓
永廣, ナガヒロ名
秀子, ヒデコ
学位
研究キーワード
研究分野
経歴
- 2017年02月, 9999年, 大阪大学, 核物理研究センター 核物理理論研究部門, 特任准教授
- 2012年04月, 9999年, 奈良女子大学, 研究院 自然科学系 物理学領域, 准教授
- 2008年10月, 2012年03月, 奈良女子大学, 助教
- 2006年04月, 2008年10月, 大阪大学核物理研究センター 学振特別研究員
- 2005年04月, 2006年03月, 大阪大学核物理研究センター 特任研究員
学歴
担当経験のある科目（授業）
- パサージュ（２２Ｂ）, 奈良女子大学
- パサージュ（２２Ａ）, 奈良女子大学
- ハドロン物理学演習, 奈良女子大学
- 数物特別セミナーＢ, 奈良女子大学
- 力学１, 奈良女子大学
- ハドロン物理学, 奈良女子大学
- 数物特別セミナーＡ, 奈良女子大学
- 計算機処理演習, 奈良女子大学
- 計算機処理, 奈良女子大学
- 応用複素解析演習, 奈良女子大学
- 力学演習, 奈良女子大学
- 力学１演習, 奈良女子大学
- 原子核理論セミナー, 奈良女子大学
- 原子核物理学特論, 奈良女子大学
- シミュレーション物理, 奈良女子大学
- 力学1演習, 奈良女子大学
- 計算機物理, 奈良女子大学
所属学協会
Ⅱ．研究活動実績
論文
- 査読あり, 英語, Nature Physics 2023, Chiral symmetry restoration at high matter density observed in pionic atoms, Takahiro Nishi; Kenta Itahashi; DeukSoon Ahn; Georg P. A. Berg; Masanori Dozono; Daijiro Etoh; Hiroyuki Fujioka; Naoki Fukuda; Nobuhisa Fukunishi; Hans Geissel; Emma Haettner; Tadashi Hashimoto; Ryugo S. Hayano; Satoru Hirenzaki; Hiroshi Horii; Natsumi Ikeno; Naoto Inabe; Masahiko Iwasaki; Daisuke Kameda; Keichi Kisamori; Yu Kiyokawa; Toshiyuki Kubo; Kensuke Kusaka; Masafumi Matsushita; Shin’ichiro Michimasa; Go Mishima; Hiroyuki Miya; Daichi Murai; Hideko Nagahiro; Megumi Niikura; Naoko Nose-Togawa; Shinsuke Ota; Naruhiko Sakamoto; Kimiko Sekiguchi; Yuta Shiokawa; Hiroshi Suzuki; Ken Suzuki; Motonobu Takaki; Hiroyuki Takeda; Yoshiki K. Tanaka; Tomohiro Uesaka; Yasumori Wada; Atomu Watanabe; Yuni N; Watanabe; Helmut Weick; Hiroki Yamakami; Yoshiyuki Yanagisawa; Koichi Yoshida; piAF Collaboration, According to quantum chromodynamics, vacuum is not an empty space, because it is filled with quark–antiquark pairs. The pair has the same quantum numbers as the vacuum and forms a condensate because the strong interaction of the quantum chromodynamics is too strong to leave the vacuum empty. This quark–antiquark condensation, the chiral condensate, breaks the chiral symmetry of the vacuum. The expectation value of the chiral condensate is an order parameter of the chiral symmetry, which is expected to decrease at high temperatures or high matter densities where the chiral symmetry is partially restored. Head-on collisions of nuclei at ultra-relativistic energies have explored the high-temperature regime, but experiments at high densities are rare. Here we measure the spectrum of pionic 121Sn atoms and study the interaction between the pion and the nucleus. We find that the expectation value of the chiral condensate is reduced at finite density compared to the value in vacuum. The reduction is linearly extrapolated to the nuclear saturation density and indicates that the chiral symmetry is partially restored due to the extremely high density of the nucleus., 2023年03月23日, 19, 6, 788, 793, 研究論文（学術雑誌）, 10.1038/s41567-023-02001-x
- 査読あり, 英語, Physical Review D, Understanding the nature of Omega(2012) in a coupled-channel approach, Qi-Fang Lü; Hideko Nagahiro; Atsushi Hosaka, We perform a systematic analysis of the mass and strong decays of the ω(2012) resonance in a coupled-channel approach of a bare three-quark state and a composite meson-baryon state. Besides the coupling of the bare state and Ξ∗K̄ channel, the effective meson-baryon interactions are also included. We find a pole with a mass of 2008 MeV by solving the Bethe-Salpeter equation. The calculated decay widths and its ratios of branching fractions RΞK̄ΞπK̄ agree well with the new experimental measurement by the Belle Collaboration. Our results suggest that both three-quark core and Ξ∗K̄ channel are essential for the description of the ω(2012) resonance. We expect that present calculations can help us to better understand the nature of ω(2012) resonance., 2023年01月27日, 107, 1, 研究論文（学術雑誌）, 10.1103/physrevd.107.014025
- 査読あり, その他, Suplemento de la Revista Mexicana de Física, The decay of N∗ (1895) to light hyperon resonances, Kanchan Pradeepkumar Khemchandani; A. Martínez Torres; S.-H. Kim; S.-il Nam; H. Nagahiro; A. Hosaka, In this talk I review the findings of our recent works where we have studied the decay of N ∗ (1895) and the implications of such properties on the photoproduction of light hyperons. I discuss that meson-baryon interactions play an essential role in describing the nature of N ∗ (1895) and report the details of our investigation of its decays to different meson-baryon systems and to final states involving Λ(1405) and a proposed Σ(1400). We find that the width of N ∗ (1895) gets important contributions from the decay to light hyperon resonances. Such an information can be used to look for alternative processes to study N ∗ (1895) in experimental data., 2022年06月08日, 3, 3, 研究論文（国際会議プロシーディングス）, 10.31349/suplrevmexfis.3.0308063
- 査読あり, 英語, Physical Review D, Decay properties of $N^*(1895)$, Khemch; ani, K.P.; Martinez Torres, A.; Nagahiro, H.; Hosaka, A., The nature of nucleon resonances is still being debated, while much experimental data are accumulated. In this work, we focus on the negative parity resonance N∗(1895) which is located in the scattering region of various meson-baryon coupled channels, and such dynamics can be crucial in understanding its properties. To test the relevance of such hadron dynamics, we investigate the decay properties of N∗(1895) in detail. We examine how a two pole nature of N∗(1895) is compatible with its observed decay properties. Moreover, we find that the resonance decays into final states involving Λ(1405) and ς(1400), where the latter is not yet observed experimentally. Such decay processes can be useful to study the properties of the aforementioned hyperon resonances., 2020年10月, 103, 1, 研究論文（学術雑誌）, 10.1103/physrevd.103.016015
- 査読あり, 英語, Physical Review Letters, Search for η′ Bound Nuclei in the C12(γ,p) Reaction with Simultaneous Detection of Decay Products, N. Tomida; N. Muramatsu; M. Niiyama; J. K. Ahn; W. C. Chang; J. Y. Chen; M. L. Chu; S. Daté; T. Gogami; H. Goto; H. Hamano; T. Hashimoto; Q. H. He; K. Hicks; T. Hiraiwa; Y. Honda; T. Hotta; H. Ikuno; Y. Inoue; T. Ishikawa; I. Jaegle; J. M. Jo; Y. Kasamatsu; H. Katsuragawa; S. Kido; Y. Kon; T. Maruyama; S. Masumoto; Y. Matsumura; M. Miyabe; K. Mizutani; H. Nagahiro; T. Nakamura; T. Nakano; T. Nam; T. N. T. Ngan; Y. Nozawa; Y. Ohashi; H. Ohnishi; T. Ohta; K. Ozawa; C. Rangacharyulu; S. Y. Ryu; Y. Sada; M. Sasagawa; T. Shibukawa; H. Shimizu; R. Shirai; K. Shiraishi; E. A. Strokovsky; Y. Sugaya; M. Sumihama; S. Suzuki; S. Tanaka; A. Tokiyasu; Y. Tsuchikawa; T. Ueda; H. Yamazaki; R. Yamazaki; Y. Yanai; T. Yorita; C. Yoshida; M. Yosoi, We measured missing mass spectrum of the ^{12}C(γ,p) reaction for the first time in coincidence with potential decay products from η^{'} bound nuclei. We tagged an (η+p) pair associated with the η^{'}N→ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cosθ_{lab}^{ηp}<-0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η^{'} production rate. Our results indicate a small branching fraction of the η^{'}N→ηN process and/or a shallow η^{'}-nucleus potential., 2020年05月20日, 124, 20, 202501, 202501, 研究論文（学術雑誌）, 国際誌, 10.1103/physrevlett.124.202501
- 査読あり, その他, Acta Phys. Polon. B, Nuclear Deformation Effects to the Formation Cross Section of $η '$ Mesic Nucleus, Kinutani, S.; Hirao, M.; Nagahiro, H.; Hirenzaki, S., © 2020 Jagellonian University. All rights reserved. We study the nuclear deformation effects to the formation spectrum of the η0-mesic nucleus theoretically. We find that the deformation effects could significantly change the spectrum shape and the effects should be considered appropriately., 2020年, 51, 1, 333, 338, 研究論文（学術雑誌）, 10.5506/APhysPolB.51.333
- 査読あり, その他, Physical Review D, Three-body decay of $Λ_c^* (2765)$ and determination of its spin-parity, Arifi, A.J.; Nagahiro, H.; Hosaka, A.; Tanida, K., We study three-body decays of Λc∗(2765)→Λc+π+π- by using effective Lagrangians in a nonrelativistic framework. We consider the sequential decays through ςc(2455)π and ςc∗(2520)π in intermediate states which are dominant contributions. The coupling constants in the effective Lagrangians are computed in the quark model. We demonstrate that the ratio R=Γ(Λc∗→ςc∗(2520)π)/Γ(Λc∗→ςc(2455)π) and angular correlations are sensitive to the spin and parity of Λc∗(2765). Thus, the measurement of these observables in experimental facilities such as Belle and LHCb can provide useful constraints to determine the spin and parity of Λc∗(2765)., 2020年, 101, 9, 094023, 094023, 研究論文（学術雑誌）, 10.1103/PhysRevD.101.094023
- 査読あり, その他, Physical Review D, Roper-like resonances with various flavor contents and their two-pion emission decays, A. J. Arifi; H. Nagahiro; A. Hosaka; K. Tanida, We study the three-body decay of the newly observed bottom baryon Λb∗(6072) by LHCb; Λb∗(6072)→Λbππ. Its mass about 500 MeV above the ground state Λb and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon N(1440). In terms of sequential processes going through ςb and ςb∗, we find that the observed invariant mass distribution is reproduced assuming its spin and parity JP=1/2+. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy., 2020年06月16日, 101, 11, 111502, 111502, 研究論文（学術雑誌）, 10.1103/PhysRevD.101.111502
- 査読あり, その他, Phys. Rev. D, Three-body decay of $Λ_c^*(2595)$ and $Λ_c^*(2625)$ with the inclusion of a direct two-pion coupling, Arifi, A.J.; Nagahiro, H.; Hosaka, A., We investigate the three-body decays of Λc∗(2595) and Λc∗(2625) into Λcππ by including a direct process going through the two-pion coupling of Λc∗Λcππ in addition to the sequential processes going through Σc(2455) and Σc∗(2520). The strength of the direct coupling is related to that of the Yukawa coupling by the chiral partner structure between Λc's and Σc's, while the strength of the Yukawa coupling is estimated by the quark model. It is found that the direct process gives a considerable contribution especially in the decay of Λc∗(2625). A clear indication of the direct process is seen in an asymmetric pattern in the angular correlation between the two pions. We discuss the usefulness of the detailed analysis of the decays for the study of the structure of Λc∗., 2018年12月12日, 98, 11, 114007, 114007, 研究論文（学術雑誌）, 10.1103/PhysRevD.98.114007
- 査読あり, その他, Acta Phys. Polon. B, Spectroscopy of $η ^\prime $-mesic Nuclei with WASA at GSI/FAIR, Tanaka, Y.K.; others, We plan to conduct an experimental search for η0-mesic nuclei in order to investigate in-medium properties of the η0 meson. A 2.5 GeV proton beam is employed to produce η0-mesic 11C nuclei with the 12C(p,d)η0⊗11C reaction. Simultaneous measurements of the forward ejected deuterons and decay protons from η0-mesic nuclei will allow us to achieve high experimental sensitivity. The experiment will be performed at GSI by making full use of the fragment separator FRS and the WASA detector system. The plan of this proposed experiment is described., 2020年, 51, 1, 39, 44, 研究論文（学術雑誌）, 10.5506/APhysPolB.51.39
- 査読あり, その他, Physics Letters B, Constraining the optical potential in the search for η-mesic 4He, M. Skurzok; P. Moskal; N.G. Kelkar; S. Hirenzaki; H. Nagahiro; N. Ikeno, © 2018 The Author(s) A consistent description of the dd→ 4Heη and dd→ (4Heη)→boundX cross sections was recently proposed with a broad range of real (V0) and imaginary (W0), η−4He optical potential parameters leading to a good agreement with the dd→ 4Heη data. Here we compare the predictions of the model below the η production threshold, with the WASA-at-COSY excitation functions for the dd→ 3HeNπ reactions to put stronger constraints on (V0,W0). The allowed parameter space (with |V0|<∼ 60 MeV and |W0|<∼7 MeV estimated at 90% CL) excludes most optical model predictions of η−4He nuclei except for some loosely bound narrow states., 2018年07月, 782, 6, 12, 研究論文（学術雑誌）, 10.1016/j.physletb.2018.04.047
- 査読あり, その他, Few Body Syst., Multistrange Meson-Baryon Dynamics and Resonance Generation, Khemch; ani, K.P.; Mart\'\i{}nez Torres, A.; Hosaka, A.; Nagahiro, H.; Navarra, F.S.; Nielsen, M., In this talk I review our recent studies on meson-baryon systems with strangeness -1 and -2. The motivation of our works is to find resonances generated as a consequence of coupled channel meson-baryon interactions. The coupled channels are all meson-baryon systems formed by combining a pseudoscalar or a vector meson with an octet baryon such that the system has the strange quantum number equal to -1 or -2. The lowest order meson-baryon interaction amplitudes are obtained from Lagrangians based on the chiral and the hidden local symmetries related to the vector mesons working as the gauge bosons. These lowest order amplitudes are used as an input to solve the Bethe–Salpeter equation and a search for poles is made in the resulting amplitudes, in the complex plane. In case of systems with strangeness -1, we find evidence for the existence of some hyperons such as: Λ(2000) , Σ(1750) , Σ(1940) , Σ(2000). More recently, in the study of strangeness -2 systems we have found two narrow resonances which can be related to Ξ(1690) and Ξ(2120). In this latter work, we have obtained the lowest order amplitudes relativistically as well as in the nonrelativistic approximation to solve the scattering equations. We find that the existence of the poles in the complex plane does not get affected by the computation of the scattering equation with the lowest order amplitudes obtained in the nonrelativistic approximation., 2018年05月, 59, 3, 29, 29, 研究論文（学術雑誌）, 10.1007/s00601-018-1338-2
- 査読あり, その他, Physical Review Letters, Spectroscopy of Pionic Atoms in Sn122(d,He3) Reaction and Angular Dependence of the Formation Cross Sections, T. Nishi; K. Itahashi; G. P. A. Berg; H. Fujioka; N. Fukuda; N. Fukunishi; H. Geissel; R. S. Hayano; S. Hirenzaki; K. Ichikawa; N. Ikeno; N. Inabe; S. Itoh; M. Iwasaki; D. Kameda; S. Kawase; T. Kubo; K. Kusaka; H. Matsubara; S. Michimasa; K. Miki; G. Mishima; H. Miya; H. Nagahiro; M. Nakamura; S. Noji; K. Okochi; S. Ota; N. Sakamoto; K. Suzuki; H. Takeda; Y. K. Tanaka; K. Todoroki; K. Tsukada; T. Uesaka; Y. N. Watanabe; H. Weick; H. Yamakami; K. Yoshida, We observed the atomic 1s and 2p states of π- bound to Sn121 nuclei as distinct peak structures in the missing mass spectra of the Sn122(d,He3) nuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve a potential of discovery, which includes the capability of determining the angle-dependent cross sections with high statistics. The 2p state in a Sn nucleus was observed for the first time. The binding energies and widths of the pionic states are determined and found to be consistent with previous experimental results of other Sn isotopes. The spectrum is measured at finite reaction angles for the first time. The formation cross sections at the reaction angles between 0° and 2° are determined. The observed reaction-angle dependence of each state is reproduced by theoretical calculations. However, the quantitative comparison with our high-precision data reveals a significant discrepancy between the measured and calculated formation cross sections of the pionic 1s state., 2018年04月13日, 120, 15, 152505, 152505, 研究論文（学術雑誌）, 10.1103/physrevlett.120.152505
- 査読あり, その他, PoS, Understanding the properties of $Ξ(1690)$ and $Ξ(2120)$, Khemch; ani, K.P.; Mart\'\i{}nez Torres, A.; Hosaka, A.; Nagahiro, H.; Navarra, F.S.; Nielsen, M., 2018年02月16日, Hadron2017, 056, 056, 研究論文（学術雑誌）, 10.22323/1.310.0056
- 査読あり, その他, Phys. Rev. D, Why $Ξ(1690)$ and $Ξ(2120)$ are so narrow?, Khemch; ani, K.P.; Mart\'\i{}nez Torres, A.; Hosaka, A.; Nagahiro, H.; Navarra, F.S.; Nielsen, M., The Ξ baryons are expected to be naturally narrower as compared to their nonstrange and strange counterparts since they have only one light quark and, thus, their decay involves producing either a light meson and doubly strange baryon or both meson and baryon with strangeness which involves, relatively, more energy. In fact, some Ξ's have full widths of the order of even 10-20 MeV when, in principle, they have a large phase space to decay to some open channels. Such is the case of Ξ(1690), for which the width has been found to be of the order of 10 MeV in the latest BABAR and BELLE data. In this manuscript we study why some Ξ's are so narrow. Based on a coupled channel calculation of the pseudoscalar meson-baryon and vector meson-baryon systems with chiral and hidden local symmetry Lagrangians, we find that the answer lies in the intricate hadron dynamics. We find that the known mass, width, spin-parity, and branching ratios of Ξ(1690) can be naturally explained in terms of coupled channel meson-baryon dynamics. We find another narrow resonance which can be related to Ξ(2120). We also look for exotic states Ξ+ and Ξ - but find none. In addition we provide the cross sections for K̄Λ,K̄Σ→πΞ which can be useful for understanding the enhanced yield of Ξ reported in recent studies of heavy ion collisions., 2018年02月07日, 97, 3, 034005, 034005, 研究論文（学術雑誌）, 10.1103/PhysRevD.97.034005
- 査読あり, その他, Physical Review C, Missing-mass spectroscopy of the C12(p,d) reaction near the η′-meson production threshold, Y. K. Tanaka; K. Itahashi; H. Fujioka; Y. Ayyad; J. Benlliure; K.-T. Brinkmann; S. Friedrich; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knöbel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, Excitation-energy spectra of C11 nuclei near the η′-meson production threshold have been measured by missing-mass spectroscopy using the C12(p,d) reaction. A carbon target has been irradiated with a 2.5 GeV proton beam supplied by the synchrotron SIS-18 at GSI to produce η′-meson bound states in C11 nuclei. Deuterons emitted at 0 in the reaction have been momentum analyzed by the fragment separator (FRS), used as a high-resolution spectrometer. No distinct structure due to the formation of η′-mesic states is observed although a high statistical sensitivity is achieved in the experimental spectra. Upper limits on the formation cross sections of η′-mesic states are determined, and thereby a constraint imposed on the η′-nucleus interaction is discussed., 2018年01月12日, 97, 1, 015202, 015202, 研究論文（学術雑誌）, 10.1103/physrevc.97.015202
- 査読あり, 英語, Physical Review D, Structure of charmed baryons studied by pionic decays, Hideko Nagahiro; Shigehiro Yasui; Atsushi Hosaka; Makoto Oka; Hiroyuki Noumi, We investigate the decays of the charmed baryons aiming at the systematic understanding of hadron internal structures based on the quark model by paying attention to heavy quark symmetry. We evaluate the decay widths from the one-pion emission for the known excited states, Lambda(c)*(2595), Lambda(c)*(2625), Lambda(c)*(2765), Lambda(c)*(2880), and Lambda(c)*(2940), as well as for the ground states Sigma(c)*(2455) and Sigma(c)*(2520). The decay properties of the lower excited charmed baryons are well explained, and several important predictions for higher excited baryons are given. We find that the axial- vector- type coupling of the pion to the light quarks is essential, which is expected from chiral symmetry, to reproduce the decay widths especially of the low- lying. Lambda(c)* baryons. We emphasize the importance of the branching ratios of Gamma(Sigma(c)*pi)/Gamma(Sigma(c) pi) for the study of the nature of higher excited. Lambda(c)* baryons., 2017年01月23日, 95, 1, 研究論文（学術雑誌）, 10.1103/physrevd.95.014023
- その他, JPS Conf. Proc., Formation of Deeply Bound Pionic Atoms and Pion Properties in Nuclei, Ikeno, Natsumi; Yamagata-Sekihara, Junko; Nagahiro, Hideko; Hirenzaki, Satoru, 2017年, 13, 020016, 020016, 研究論文（学術雑誌）, 10.7566/JPSCP.13.020016
- その他, JPS Conf. Proc., Search for \ensuremathη' Mesic Nuclei in GSI/FAIR, Itahashi, K.; others, 2017年, 17, 082008, 082008, 研究論文（学術雑誌）, 10.7566/JPSCP.17.082008
- 査読あり, 英語, JPS Conf. Proc., Excitation Spectra of Carbon Nuclei near $η '$ Emission Threshold, Itahashi, Kenta; others, 2017年, 13, 020030, 020030, 研究論文（学術雑誌）, 10.7566/JPSCP.13.020030
- 査読あり, その他, Acta Physica Polonica B, First Results on the Experimental Search for $\eta ^\prime $-Mesic Nuclei with the $^{12}$C($p,d$) Reaction, Y.K. Tanaka; Y. Ayyad; J. Benlliure; K.-T. Brinkmann; S. Friedrich; H. Fujioka; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M.N. Harakeh; R.S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knöbel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H.J. Ong; S. Pietri; A. Prochazka; C. Rappold; M.P. Reiter; J.L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; Y.N. Watanabe; H. Weick; E. Widmann; J.S. Winfield; X. Xu; H. Yamakami; J. Zhao, We performed a missing-mass spectroscopy experiment of the 12C(p, d) reaction in order to search for η′-mesic nuclei. Excitation spectrum of 11C around the η′-meson production threshold was successfully obtained with a high-statistical sensitivity and sufficiently good energy resolution. Since no peak structure associated with the formation of η′-mesic nuclei was observed, we set constraints on the formation cross sections of η′-mesic states and on the η′-nucleus interaction., 2017年, 48, 10, 1813, 1813, 研究論文（学術雑誌）, 10.5506/aphyspolb.48.1813
- 査読あり, 英語, Eur. Phys. J. A, $η$-nucleus interaction from the $d+d$ reaction around the $η$ production threshold, Ikeno, N.; Nagahiro, H.; Jido, D.; Hirenzaki, S., The eta mesic nucleus is considered to be one of the interesting exotic many-body systems and has been studied since the 1980s theoretically and experimentally. Recently, the formation of the eta mesic nucleus in the fusion reactions of the light nuclei such as d + d -> (eta + alpha) -> X has been proposed and the experiments have been performed by WASA-at-COSY. We develop a theoretical model to evaluate the formation rate of the eta mesic nucleus in the fusion reactions and show the calculated results. We find that the eta bound states could be observed in the reactions in cases with the strong attractive and small absorptive eta-nucleus interactions. We compare our results with existing data of the d+ d -> eta + alpha and the d+ d -> He-3 + N + pi reactions. We find that the analyses by our theoretical model with the existing data can provide new information on the eta-nucleus interaction., 2017年, 53, 10, 194, 194, 研究論文（学術雑誌）, 10.1140/epja/i2017-12381-7
- 査読無し, 英語, JPS Conf. Proc., Charmed baryons and their interactions, Hosaka, Atsushi; Hiyama, Emiko; Kim, SangHo; Kim, Hyun-Chul; Nagahiro, Hideko; Noumi, Hiroyuki; Oka, Makoto; Shirotori, Kotaro; Yoshida, Tetsuya; Yasui, Shigehiro, 2017年, 17, 111002, 111002, 研究論文（学術雑誌）, 10.7566/JPSCP.17.111002
- 査読あり, その他, Physical Review Letters, Measurement of Excitation Spectra in the 12C(p,d) Reaction near the η′ Emission Threshold, Y. K. Tanaka; K. Itahashi; H. Fujioka; Y. Ayyad; J. Benlliure; K.-T. Brinkmann; S. Friedrich; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knöbel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, © 2016 American Physical Society. Excitation spectra of C11 are measured in the C12(p,d) reaction near the η′ emission threshold. A proton beam extracted from the synchrotron SIS-18 at GSI with an incident energy of 2.5 GeV impinges on a carbon target. The momenta of deuterons emitted at 0° are precisely measured with the fragment separator (FRS) operated as a spectrometer. In contrast to theoretical predictions on the possible existence of deeply bound η′-mesic states in carbon nuclei, no distinct structures are observed associated with the formation of bound states. The spectra are analyzed to set stringent constraints on the formation cross section and on the hitherto barely known η′-nucleus interaction., 2016年11月08日, 117, 20, 研究論文（学術雑誌）, 10.1103/physrevlett.117.202501
- 査読あり, 英語, Nuclear Physics A, Production and decay of charmed baryons, Atsushi Hosaka; Emiko Hiyama; SangHo Kim; Hyun-Chul Kim; Hideko Nagahiro; Hiroyuki Noumi; Makoto Oka; Kotaro Shirotori; Tetsuya Yoshida; Shigehiro Yasui, In this paper, we discuss reactions involving charmed baryons to explore their unique features. A well known phenomenon, the separation of the two internal motions of the rho and lambda types of a three-quark system is revisited. First we discuss the mass spectrum of low lying excitations as function of the heavy quark mass, smoothly connecting the SU(3) and heavy quark limits. The properties of these modes can be tested in the production and decay reactions of the baryons. For production, we consider a one step process which excites dominantly lambda modes. We find abundant production rates for some of the excited states. For decay, we study a pion emission process which provides a clean tool to test the structure of heavy quark systems due to the well controlled low energy dynamics of pions and quarks. Both production and decay of charmed baryons are issues for future experiments at J-PARC. (C) 2016 Elsevier B.V. All rights reserved., 2016年10月, 954, 341, 351, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2016.05.009
- その他, Acta Phys. Polon. B, Formation of $η '(958)$ Bound States by $(γ ,d)$ Reaction, Miyatani, Moeki; Ikeno, Natsumi; Nagahiro, Hideko; Hirenzaki, Satoru, We have investigated the 6Li(γ, d) reaction theoretically for the formation of the η′(958) mesic nucleus. We have reported the numerical results in this article., 2016年, 47, 2, 367, 372, 研究論文（学術雑誌）, 10.5506/APhysPolB.47.367
- 査読あり, 英語, AIP Conf. Proc., Decays of doubly charmed meson molecules, Molina, R.; Nagahiro, H.; Hosaka, A., If the X(3872), Y(3940) and X(4160) are D*(D) over bar + c.c., D*(D) over bar (S) and D-S*(D) over bar (S)* molecules, respectively, there should be doubly charmed mesons (D-(*D-)(()*())). In this talk we predict two states with J(P) = 1(+) in the charm = 2 sector, one DD* state around 3850 MeV, other D*D* state with mass around 3970 MeV, and other two similar states in the (charm = 2; strangeness = 1) sector. Besides that, we evaluate the decay widths of doubly charm mesons D*D*(1(+)), into DD pi and DD gamma. These decays are mediated by anomalous couplings D*D* - DD*, with the subsequent decay of D* into D pi or D gamma., 2016年, 1701, 1, 050011, 050011, 研究論文（学術雑誌）, 10.1063/1.4938651
- 査読あり, 英語, EPJ Web Conf., Precision spectroscopy of pionic atoms and chiral symmetry in nuclei, Itahashi, Kenta; others, We conduct an experimental project to make spectroscopy of deeply bound pionic atoms systematically over wide range of nuclei. We aim at studying the strong interaction in the low energy region, which has close connection to spontaneous chiral symmetry breaking and its partial restoration in nuclear matter. First experimental results show improved spectral resolution and much better statistical sensitivity than previous experiments. Present status of the experiment is reported., 2016年, 130, 01017, 01017, 研究論文（学術雑誌）, 10.1051/epjconf/201613001017
- 査読あり, 英語, EPJ Web of Conferences, Search for η ′ mesic nuclei by missing-mass spectroscopy of the 12C(p, d) reaction, Tanaka Y.K; Ayyad Y; Benlliure J; Brinkmann K.-T; Friedrich S; Fujioka H; Geissel H; Gellanki J; Guo C; Gutz E; Haettner E; Harakeh M.N; Hayano R.S; Higashi Y; Hirenzaki S; Hornung C; Igarashi Y; Ikeno N; Itahashi K; Iwasaki M; Jido D; Kalantar-Nayestanaki N; Kanungo R; Knoebel R; Kurz N; Metag V; Mukha I; Nagae T; Nagahiro H; Nanova M; Nishi T; Ong H.J; Pietri S; Prochazka A; Rappold C; Reiter M.P; Rodr{\'i}guez; S{\'a}nchez J.L; Scheidenberger C; Simon H; Sitar B; Strmen P; Sun B; Suzuki K; Szarka I; Takechi M; Tanihata I; Terashima S; Watanabe Y.N; Weick H; Widmann E; Winfield J.S; Xu X; Yamakami H; Zhao J, We performed a missing-mass spectroscopy experiment of the 12C(p, d) reaction at 2.5 GeV proton energy in order to search for η′ mesic nuclei. An excitation-energy spectrum of 11C was obtained around the η′ production threshold. As no significant peak structure was observed in the spectrum, upper limits of the formation cross section of η′ mesic nuclei have been determined. Preliminary results of the experiment as well as future prospects are given., 2016年, 130, 02010, 02010, 研究論文（学術雑誌）, 10.1051/epjconf/201613002010
- 査読あり, 英語, Eur. Phys. J. A, Formation of $η^\prime$ (958) meson bound states by the$^6$Li( $γ$ ,d) reaction, Miyatani, M.; Ikeno, N.; Nagahiro, H.; Hirenzaki, S., © 2016, SIF, Springer-Verlag Berlin Heidelberg. We have investigated the 6Li(γ,d) reaction theoretically for the formation of the ń(958) mesic nucleus close to the recoilless kinematics. We have developed the theoretical formula and reported the quantitative results of the formation spectra for various cases in this article. We have found that the formation cross sections are reduced by the effects of the fragile deuteron form factor., 2016年, 52, 7, 193, 193, 研究論文（学術雑誌）, 10.1140/epja/i2016-16193-y
- 査読あり, 英語, Chiral Symmetry in Hadrons and Nuclei, Decays of doubly charmed meson molecules, R. Molina; A. Hosaka; H. Nagahiro, The interaction between pseudoscalar and/or vector mesons can be studied using hidden gauge Lagrangians. In this framework, the interaction between charmed mesons has been studied. Furthermore, doubly charmed states are also predicted. These new states are near the D* D* and D* D-s* thresholds, and have spin-parity J(P) = 1(+). We evaluate the decay widths of these states, named as R-cc(3970) and S-cc(4100) (with strangeness), and obtain 44 MeV for the non-strangeness, and 24 MeV for the doubly charm-strange state. Essentially, the decay modes are DD(s)pi and DD(s)gamma, being the D pi and D gamma emitted by one of the D* meson which forms the molecule., 2015年, 124, 127, 研究論文（国際会議プロシーディングス）
- 査読あり, 英語, Acta Phys. Polon. B, Exotic atoms and exotic nuclei, Hirenzaki, S.; Nagahiro, H.; Ikeno, N.; Yamagata-Sekihara, J., In this article, we briefly review the study of the exotic atoms and exotic nuclei, and report on recent research activities of eta-mesic nucleus and kaonic atoms., 2015年, 46, 1, 121, 126, 研究論文（学術雑誌）, 10.5506/APhysPolB.46.121
- 査読あり, 英語, PTEP, Formation spectra of pionic atoms in the Green's function method, Ikeno, Natsumi; Yamagata-Sekihara, Junko; Nagahiro, Hideko; Hirenzaki, Satoru, We study the formation spectra of deeply bound pionic atoms in the (d, He-3) reactions using the Green's function method, stimulated by recent developments in experimental techniques. The Green's function method is considered to be a better theoretical formalism than the effective number approach to evaluate the formation rate of unstable systems. We compare the calculated results by the Green's function method with those by the effective number approach in various cases. We find that the differences between the results obtained by both methods are reasonably small and we can reaffirm that the effective number approach is a good theoretical method for the analyses of the previous experimental data with typical binding-energy errors of Delta B. E. greater than or similar to 20 keV for the deeply bound pionic atoms. On the other hand, we think that theoretical results using the Green's function method will be necessary in the near future to deduce precise information on the pion properties in nuclei from analyses of the pionic atom data with better accuracy than before., 2015年, 2015, 3, 033D01, 研究論文（学術雑誌）, 10.1093/ptep/ptv013
- 査読あり, 英語, Acta Phys. Polon. A, Formation of Deeply Bound Pionic Atoms and Pion Properties in Nuclei, Ikeno, N.; Yamagata-Sekihara, J.; Nagahiro, H.; Hirenzaki, S., We study theoretically the formation of deeply bound pionic atoms to deduce the pion properties in nuclei precisely from the observables. We show the theoretical formation spectra of deeply bound pionic atoms in the various cases. We consider the pionic atom formation on the even-even and neutron-odd nucleus targets. We also show the angular dependence of the formation spectra in the (d, He-3) reactions. Based on these theoretical results, we have found that we can obtain the systematic information on several deeply bound states for various nuclei. Actually, these observations have been performed in the experiments at RIBF/RIKEN., 2015年, 127, 5, 1568, 1570, 研究論文（学術雑誌）, 10.12693/APhysPolA.127.1568
- 査読無し, 英語, Acta Phys. Polon. B, Search for $η '$(958)-nucleus Bound States by $(p,d)$ Reaction at GSI and FAIR, Fujioka, H.; others, 2015年, 46, 1, 127, 132, 研究論文（学術雑誌）, 10.5506/APhysPolB.46.127
- 査読無し, 英語, Hyperfine Interact., Spectroscopy of $η'$-nucleus bound states at GSI and FAIR — very preliminary results and future prospects —, Fujioka, H.; others, The possible existence of eta'-nucleus bound states has been put forward through theoretical and experimental studies. It is strongly related to the eta' mass at finite density, which is expected to be reduced because of the interplay between the U (A) (1) anomaly and partial restoration of chiral symmetry. The investigation of the C(p,d) reaction at GSI and FAIR, as well as an overview of the experimental program at GSI and future plans at FAIR are discussed., 2015年, 234, 1-3, 33, 39, 研究論文（学術雑誌）, 10.1007/s10751-015-1145-9
- 査読あり, 英語, EPJ Web Conf., Meson properties from mesic atoms and mesic nuclei, Hirenzaki, Satoru; Ikeno, Natsumi; Nagahiro, Hideko; Higashi, Yuko, Meson properties are believed to have close connection to the fundamental theory, QCD, and have been studied for a long time both theoretically and experimentally. In this report, we study the recent activities in this field and consider the eta(958) mesic nuclei and the deeply bound pionic atoms. We summarize the possible formation of the eta(958) mesic nuclei by the (p, d) reactions and report the new possibilities of the spectroscopic study of the pionic atoms using the (d,He-3) reactions., 2014年, 81, 01026, 01026, 研究論文（学術雑誌）, 10.1051/epjconf/20148101026
- 査読あり, 英語, Phys. Lett. B, Experimental constraints on the \ensuremathω –nucleus real potential, Friedrich, S.; others, In a search for omega mesic states, the production of omega-mesons in coincidence with forward going protons has been studied in photon induced reactions on C-12 for incident photon energies of 1250-3100 MeV. The pi(0)gamma pairs from decays of bound or quasi-free omega-mesons have been measured with the CBELSA/TAPS detector system in coincidence with protons registered in the MiniTAPS forward array. Structures in the total energy distribution of the pi(0)gamma pairs, which would indicate the population and decay of bound omega B-11 states, are not observed. The pi(0)gamma cross section of 0.3 nbMeV(-1) sr(-1) observed in the bound state energy regime between -100 and 0 MeV may be accounted for by yield leaking into the bound state regime because of the large in-medium width of the omega-meson. A comparison of the measured total energy distribution with calculations suggests the real part V-0 of the omega B-11 potential to be small and only weakly attractive with V-0(rho = rho(0)) = -15 +/- 35(stat) +/- 20(syst) MeV in contrast to some theoretical predictions of attractive potentials with a depth of 100-150 MeV. (C) 2014 The Authors. Published by Elsevier B.V., 2014年, 736, 26, 32, 研究論文（学術雑誌）, 10.1016/j.physletb.2014.07.004
- 査読あり, 英語, Phys. Rev. C, Elementarity of composite systems, Nagahiro, Hideko; Hosaka, Atsushi, The "compositeness" or "elementarity" is investigated for s-wave composite states dynamically generated by energy-dependent and independent interactions. The bare mass of the corresponding fictitious elementary particle in an equivalent Yukawa model is shown to be infinite, indicating that the wave function renormalization constant Z is equal to zero. The idea can be equally applied to both resonant and bound states. In a special case of zero-energy bound states, the condition Z = 0 does not necessarily mean that the elementary particle has the infinite bare mass. We also emphasize arbitrariness in the "elementarity" leading to multiple interpretations of a physical state, which can be either a pure composite state with Z = 0 or an elementary particle with Z not equal 0. The arbitrariness is unavoidable because the renormalization constant Z is not a physical observable., 2014年, 90, 6, 065201, 065201, 研究論文（学術雑誌）, 10.1103/PhysRevC.90.065201
- 査読無し, 英語, Acta Phys. Polon. B, Meson Properties at Finite Density from Mesic Atoms and Mesic Nuclei, Hirenzaki, S.; Nagahiro, H., The properties of eta'(958) meson at finite nuclear density is considered to have close connection with the effects of U-A(1) anomaly at finite density. In this context, we are very much interested in the study of the eta'(958)mesic nuclei. As for the eta-mesic nuclei, which have been studied for a long time, we think it is interesting and important to consider both effects of the coupling of eta N system to N*(1535) and of the mixing of eta with eta'(958). In this article, we briefly summarize recent results of our studies concerning with eta'(958)- and eta-mesic nuclei., 2014年, 45, 3, 619, 619, 研究論文（学術雑誌）, 10.5506/APhysPolB.45.619
- 査読無し, 英語, Int. J. Mod. Phys. Conf. Ser., $N^*$'s and $Δ$'s generated in vector, pseudoscalar meson-baryon systems, Khemch; ani, K.P.; Martinez Torres, A.; Nagahiro, H.; Hosaka, A., 2014年, 26, 1460060, 1460060, 研究論文（学術雑誌）, 10.1142/S201019451460060X
- 査読無し, 英語, EPJ Web Conf., Missing Mass Spectroscopy of $η'$ Mesic Nuclei with the $(p,d)$ Reaction at GSI, Tanaka, Yoshiki K.; others, We plan a missing-mass spectroscopy experiment of eta' mesic nuclei with the C-12(p,d)eta'circle times C-11 reaction to study in-medium properties of the eta' meson. In nuclear medium, due to restoration of chiral symmetry, the mass of the eta' meson may be reduced, and 71 bound states in a nucleus may exist. The experiment will be started at GSI with a 2.5 GeV proton beam using FRS as a spectrometer and will be continued at Super-FRS at FAIR. The plan of the experiment and development of a Cherenkov detector and an optics mode are described., 2014年, 66, 09019, 09019, 研究論文（学術雑誌）, 10.1051/epjconf/20146609019
- 査読無し, 英語, EPJ Web Conf., Spectroscopy of eta-prime Mesic Nuclei via Semi-Exclusive Measurement at FAIR, Fujioka, Hiroyuki; others, In order to investigate a possible mass reduction of an eta' meson at finite density, a series of missing-mass spectroscopy experiments of rl-nucleus bound states with the C-12(p,d) reaction is planned at GSI and FAIR. A semi-exclusive measurement with the tagging of protons from eta' two-body absorption (eta'NN -> NN) will be a key feature in an experiment with Super-FRS at FAIR., 2014年, 66, 09006, 09006, 研究論文（学術雑誌）, 10.1051/epjconf/20146609006
- 査読無し, 英語, JPS Conf. Proc., Formation of $η′$(958) Bound States in Nuclei, Hirenzaki, Satoru; Nagahiro, Hideko; Jido, Daisuke, 2014年, 1, 013030, 013030, 研究論文（学術雑誌）, 10.7566/JPSCP.1.013030
- 査読あり, その他, Physical Review D - Particles, Fields, Gravitation and Cosmology, Role of vector and pseudoscalar mesons in understanding 1/2- N* and Δ resonances, Khemch; ani, K.P.; Mart{\'i}nez Torres, A.; Nagahiro, H.; Hosaka, A., 2013年12月03日, 88, 11, 114016, 114016, 研究論文（学術雑誌）, 10.1103/PhysRevD.88.114016
- 査読あり, 英語, Physical Review C - Nuclear Physics, Formation of η'(958)-mesic nuclei by the (p,d) reaction, Hideko Nagahiro; Daisuke Jido; Hiroyuki Fujioka; Kenta Itahashi; Satoru Hirenzaki, We calculate theoretically the formation spectra of η'(958)-nucleus systems in the (p,d) reaction for the investigation of in-medium modification of the η' mass. We show comprehensive numerical calculations based on a simple form of the η' optical potential in nuclei with various potential depths. We conclude that one finds evidence of a possible attractive interaction between η' and the nucleus as a peak structure appearing around the η' threshold in light nuclei such as 11C, when the attractive potential is stronger than 100 MeV and the absorption width is of order 40 MeV or less. Spectroscopy of the (p,d) reaction is expected to be performed experimentally at existing facilities, such as GSI. We also estimate the contributions from the ω and ρ mesons, which have masses close to the η' meson, concluding that the observation of the peak structure of the η'-mesic nuclei is not disturbed, although their contributions may not be small. © 2013 American Physical Society., 2013年04月02日, 87, 4, 研究論文（学術雑誌）, 10.1103/PhysRevC.87.045201
- その他, PoS, Formation of deeply bound pionic atoms and pion properties in nuclei, Ikeno, Natsumi; Yamagata-Sekihara, Junko; Nagahiro, Hideko; Hirenzaki, Satoru, 2013年, Hadron2013, 172, 172, 研究論文（学術雑誌）, 10.7566/JPSCP.13.020016
- その他, PoS, Meson Properties at Finite Density from Mesic Atoms and Mesic Nuclei = Recent Topics on $π$ and $η'(958)$ in Nuclei =, Hirenzaki, Satoru; Ikeno, Natsumi; Nagahiro, Hideko, © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We study the meson-nucleus systems as the very interesting objects to deduce the hadron properties precisely and to obtain new information on the aspects of the strong interaction at finite density. We briefly introduce the recent research activities on pionic atoms and η′ (958) mesic nuclei in this article. The (d,3 He) reactions for the formation of the pionic atoms are considered at finite angles and on the odd-neutron nuclear targets to develop the systematic and accurate studies of the pion properties at various nuclear densities. η′ (958)-nucleus systems are quite interesting in the context of the effects of the UA(1) anomaly at finite density. The possible formation of the nuclear bound states of the η′meson by the (p,d) reactions is discussed to deduce the information on the mass shift of the exceptionally heavy η′meson., 2013年, Hadron2013, 014, 014, 研究論文（学術雑誌）, 10.22323/1.205.0014
- その他, PoS, Spectroscopy of $η'$ mesic nuclei using $(p, d)$ reaction, Suzuki, K.; others, © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. The h-PRiME collaboration (Japan-Germany-Austria) searches for h0(958) meson-nucleus bound states. The mass of the h0 meson is much greater than the values if it were a pure Goldstone boson associated with spontaneously broken chiral symmetry. The extra mass is to be attributed to non-perturbative gluon dynamics and the QCD axial anomaly. The h0 in media will be influenced through chiral restoration and the axial U(1) dynamics, causing accordingly a sizable mass reduction and a strong binding to the nucleus, on which an observation of such states will provide valued information. The data taking (S437 experiment) using inclusive missing mass spectroscopy of (p;d) reaction off carbon target will take place in summer 2014 at the FRS spectrometer at GSI., 2013年, Hadron2013, 166, 166, 研究論文（学術雑誌）, 10.22323/1.205.0166
- 査読無し, 英語, PoS, Dynamical origin of nonstrange baryon resonances, Khemch; ani, K.P.; Martinez Torres, A.; Nagahiro, H.; Hosaka, A., 2013年, Hadron2013, 116, 116, 研究論文（学術雑誌）, 10.22323/1.205.0116
- 査読あり, 英語, Few Body Syst., Resonances generated by the vector meson-baryon dynamics, Khemch; ani, K.P.; Martinez Torres, A.; Kaneko, H.; Nagahiro, H.; Hosaka, A., We have recently studied vector meson-octet baryon (VB) interactions with the aim to find dynamical generation of resonances in such systems. For this, we consider the s-, t-, u-channel diagrams along with a contact interaction originating from the hidden local symmetry Lagrangian. We find the contribution from all these sources, except the s-channel, to be important. The amplitudes obtained by solving the coupled channel Bethe-Salpeter equations for the systems with total strangeness zero show generation of one isospin 3/2, spin 1/2 resonance and three isospin 1/2 resonances: two with spin 3/2 and one with spin 1/2. We identify these resonances with Δ (1900) S31, N*(2080) D13, N* (1700) D13, and N*(2090) S11, respectively. Further, we briefly discuss the results of our investigation of the VB systems when coupled to the pseudoscalar meson-baryon (PB) channels. We find that the low-lying resonances couple strongly to the VB channels, a result which can be useful in studying the reactions involving pseudoscalar and vector meson exchanges. In case of the higher mass resonances (in the 1,800-2,200 MeV region), we find that some of the states claimed as dynamically generated states in the VB system can disappear due to their coupling to the PB channels. We also find that new states can appear from PB-VB coupled channel dynamics for example, we find that a Σ resonance near 1,400 MeV gets developed due to such an effect. © 2012 Springer-Verlag., 2013年, 54, 1-4, 343, 346, 研究論文（学術雑誌）, 10.1007/s00601-012-0389-z
- 査読あり, 英語, Few Body Syst., Composite and elementary components in hadron resonances, Hosaka, Atsushi; Hyodo, Tetsuo; Jido, Daisuke; Nagahiro, Hideko; Nawa, Kanabu; Ohkoda, Shunsuke; Ozaki, Sho; Yamaguchi, Yasuhiro; Yasui, Shigehiro, In hadron resonances different structures of hadronic composite (molecule) and elementary (quark-intrinsic) natures may coexist. We sketch discussions based on our previous publications on the origin of hadron resonances (Hyodo et al. Phys. Rev. C 78:025203, 2008) on exotic D̄(B) meson-nucleons as candidates of hadronic composites (Yamaguchi et al. Phys. Rev. D 84:014032, 2011) and on a1 for the coexistence/mixing of the two different natures (Nagahiro et al. Phys. Rev. D 83:111504, 2011). © 2012 Springer-Verlag., 2013年, 54, 1-4, 19, 24, 研究論文（学術雑誌）, 10.1007/s00601-012-0375-5
- 査読あり, その他, PoS, Complex 2D Matrix Model and Its Application to $N_c$-dependence of Hadron Structures, Nawa, Kanabu; Ozaki, Sho; Nagahiro, Hideko; Jido, Daisuke; Hosaka, Atsushi, We study the internal structure of resonance states in a complex 2D matrix model. We show that the geometry with "exceptional points" in the complex-parameter space can be useful to discuss parameter dependence of the structures within real-parameter subspace. By applying the model to hadron physics, we consider the Nc-dependence of hadron structures from the geometry on the complex-Nc plane., 2013年, Hadron2013, 108, 108, 研究論文（学術雑誌）, 10.22323/1.205.0108
- 査読あり, 英語, Phys. Rev. C, Formation of $η^\prime(958)$-mesic nuclei by ($p,d$) reaction, Nagahiro, Hideko; Jido, Daisuke; Fujioka, Hiroyuki; Itahashi, Kenta; Hirenzaki, Satoru, We calculate theoretically the formation spectra of. n' (958)-nucleus systems in the (p,d) reaction for the investigation of in-medium modification of the. n' mass. We show comprehensive numerical calculations based on a simple form of the. n' optical potential in nuclei with various potential depths. We conclude that one finds evidence of a possible attractive interaction between. n' and the nucleus as a peak structure appearing around the. n' threshold in light nuclei such as C-11, when the attractive potential is stronger than 100 MeV and the absorption width is of order 40 MeV or less. Spectroscopy of the (p, d) reaction is expected to be performed experimentally at existing facilities, such as GSI. We also estimate the contributions from the omega and phi mesons, which have masses close to the. n' meson, concluding that the observation of the peak structure of the. n' -mesic nuclei is not disturbed, although their contributions may not be small., 2013年, 87, 4, 045201, 045201, 研究論文（学術雑誌）, 10.1103/PhysRevC.87.045201
- 査読あり, 英語, Phys. Rev. C, Composite and elementary nature of a resonance in the \ensuremathσ model, Nagahiro, Hideko; Hosaka, Atsushi, We analyze the mixing nature of the low-lying scalar resonance consisting of the pi pi composite and the elementary particle within the sigma model. A method to disentangle the mixing is formulated in the scattering theory with the concept of the two-level problem. We investigate the composite and elementary components of the sigma meson by changing a mixing parameter. We also study the dependence of the results on model parameters such as the cut-off value and the mass of the elementary sigma meson., 2013年, 88, 5, 055203, 055203, 研究論文（学術雑誌）, 10.1103/PhysRevC.88.055203
- 査読あり, 英語, PTEP, (d,3He) reaction on odd-neutron nuclear target for the formation of deeply bound pionic atoms, Ikeno, Natsumi; Yamagata-Sekihara, Junko; Nagahiro, Hideko; Hirenzaki, Satoru, We consider pionic atom spectroscopy by the (d,He-3) reaction on an odd-neutron nuclear target in this article, which has not yet been investigated. In the (d,He-3) reaction on the odd-neutron nuclear target, we can observe pionic states in the even-neutron nucleus with spin-parity 0(+). We expect that these pionic states do not have additional shifts due to the effects of the residual interaction between neutron-hole and pionic states. For the even-neutron nuclear target cases, we may have to take into account the residual interaction effects to deduce the binding energies of the pionic states precisely from the high-precision experimental data, since the final pionic states are pion-particle plus neutron-hole [pi circle times n(-1)] states. Thus, in addition to widening the domain of pionic atom spectroscopy on the nuclear chart, the present study of the (d,He-3) reaction on an odd-neutron target is considered to be important to deduce extremely precise information on the binding energies of the observed pionic states, and to clarify the pion properties and aspects of the symmetries of the strong interaction at finite density. We modify the formula of the even-even nuclear target case to study pionic atom formation spectra on the even-odd nuclear target and show the numerical results of the Sn-117 target case. This experiment will be performed at RIBF/RIKEN in the near future., 2013年, 2013, 6, 063D01, 1-15, 研究論文（学術雑誌）, 10.1093/ptep/ptt035
- 査読あり, 英語, PTEP, Complex 2D matrix model and geometrical map on the complex-$N_c$ plane, Nawa, Kanabu; Ozaki, Sho; Nagahiro, Hideko; Jido, Daisuke; Hosaka, Atsushi, We study the parameter dependence of the internal structure of resonance states by formulating a complex two-dimensional (2D) matrix model, where the two dimensions represent two levels of resonances. We calculate a critical value of the parameter at which a "nature transition" with character exchange occurs between two resonance states, from the viewpoint of geometry on complex-parameter space. Such a critical value is useful for identifying the internal structure of resonance states with variation of the parameter in the system.We apply the model to analyze the internal structure of hadrons with variation of the color number Nc from∞to a realistic value 3. By regarding 1/Nc as the variable parameter in our model, we calculate a critical color number of the nature transition between hadronic states in terms of a quark-antiquark pair and a mesonic molecule as exotics from the geometry on the complex-Nc plane. For large-Nc effective theory, we employ the chiral Lagrangian induced by holographic QCD with a D4/D8/D8 multi-D brane system in type IIA superstring theory. © The Author(s) 2013., 2013年, 2013, 8, 083D01, 1-13, 研究論文（学術雑誌）, 10.1093/ptep/ptt051
- 査読あり, 英語, Nucl. Phys. A, Formation of the $η^\prime$(958)-mesic nuclei in missing mass spectroscopies, Nagahiro, Hideko, We calculate the formation cross section of the eta'-mesic nuclei by (pi, N) and (p, d) reactions based on the latest theoretical considerations of the eta' properties in nucleus. The results shown here are important to give predictions and support for future experiments and to establish the connection between the eta' mesic nucleus formation spectra and the modifications of the eta' properties at finite density, which will give us new information on the eta' mass generation mechanism. (C) 2013 Elsevier B.V. All rights reserved., 2013年, 914, 360, 364, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2013.03.005
- 査読あり, 英語, Nucl. Phys. A, $η^\prime$ meson under partial restoration of chiral symmetry in nuclear medium, Jido, Daisuke; Sakai, Shuntaro; Nagahiro, Hideko; Hirenzaki, Satoru; Ikeno, Natsumi, In-medium modification of the eta' mass is discussed in the context of partial restoration of chiral symmetry in nuclear medium. We emphasize that the U-A (1) anomaly effects cause the eta'-eta mass difference necessarily through the chiral symmetry breaking. As a consequence, the eta' mass is expected to be reduced by order of 100 MeV in nuclear matter where about 30% reduction of chiral symmetry takes place. The strong attraction relating to the eta' mass generation eventually implies that there should be also a strong attractive interaction in the scalar channel of the eta'-N two-body system. We find that the attraction can be strong enough to form a bound state. (C) 2012 Elsevier B.V. All rights reserved., 2013年, 914, 354, 359, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2012.12.097
- 査読あり, 英語, Nucl. Phys. A, Nuclear density probed by anti-kaon-nucleus systems and anti-kaon-nucleus interaction, Yamagata-Sekihara, J.; Ikeno, N.; Nagahiro, H.; Jido, D.; Hirenzaki, S., Effective nuclear densities probed by anti-kaon-nucleus systems is studied theoretically both for bound and low energy scattering states. As for the bound states, we investigate kaonic atoms. We find that the effective density depends on the atomic states significantly and we have the possibility to obtain the anti-kaon properties at various nuclear densities by observing the several kaonic atom states. We also find the energy dependence of the probed density by scattering states. We find that the study of the effective nuclear density will help to find the proper systems to investigate the meson properties at various nuclear densities. (C) 2013 Elsevier B.V. All rights reserved., 2013年, 914, 344, 348, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2013.01.085
- 査読無し, 英語, Few Body Syst., Formation of $η'(958)$ Meson Bound States and Chiral Symmetry In-Medium, Nagahiro, Hideko, We theoretically discuss the feasibility to observe the eta'(958)-mesic nuclei by using the missing mass spectroscopy. We evaluate the eta'-nucleus optical potential including the contribution of lowest order in density together with the second order terms account for eta' absorption by two nucleons, based on a recent model of the eta'N interaction. We show the calculated formation cross section of the eta' bound states from (pi, N) reaction with pion beam momentum p (pi) = 1.8 GeV/c and (p, d) reaction with proton kinetic energy T (p) = 2.5 GeV., 2013年, 54, 7-10, 1565, 1568, 研究論文（学術雑誌）, 10.1007/s00601-012-0568-y
- 査読無し, 英語, Few Body Syst., Formation of Deeply Bound Pionic Atoms in Sn Isotopes, Ikeno, Natsumi; Nagahiro, Hideko; Hirenzaki, Satoru, We study the formation of deeply bound pionic atoms in the (d,He-3) reaction theoretically. At different scattering angles, we find that the different subcomponents dominate the formation spectra because of the matching condition of the reaction. We also find that the pionic 1s state which is free from the residual interaction effects appears clearly in Sn-117(d, He-3) spectra. We conclude that the observation of the (d,He-3) reaction for these new cases will provide more systematic and accurate information on the pionic bound states, and it will help to develop the study of the pion properties and the partial restoration of chiral symmetry in nuclei., 2013年, 54, 7-10, 1573, 1576, 研究論文（学術雑誌）, 10.1007/s00601-012-0556-2
- 査読無し, 英語, Few Body Syst., Spectroscopy of $η'$ mesic nuclei with $(p,d)$ reaction, Tanaka, Yoshiki K.; others, We are going to perform an inclusive spectroscopy experiment of eta' mesic nuclei with the C-12(p,d) reaction to study in-medium properties of the eta' meson. In nuclear medium, the eta' meson mass may be reduced due to partial restoration of chiral symmetry. In case of sufficiently large mass reduction and small absorption width of eta' at normal nuclear density, peak structures of eta' mesic states in C-11 will be observed near the eta' emission threshold even in an inclusive spectrum. The experiment will be carried out at GSI with proton beam supplied by SIS using FRS as a spectrometer. The detail of the experiment is described., 2013年, 54, 7-10, 1263, 1266, 研究論文（学術雑誌）, 10.1007/s00601-012-0589-6
- 査読無し, 英語, Few Body Syst., Dynamically Generated Resonances from Two Vectors in the Charm Sector and their Decays, Molina, R.; Nagahiro, H.; Hosaka, A.; Branz, T.; Oset, E., In this talk we study dynamically generated resonances from two-vector mesons within the hidden gauge formalism in a coupled channel unitary approach. We focus on the sectors with charm and/or strangeness and double charm, being some of them flavor exotic. Concretely, by looking for poles in the complex plane, we get three poles in the T-matrix around 2,460, 2,640 and 2,572 MeV that we identify with the and , coupling strongly to D*rho (the first two) and D*K* respectively. In addition, we obtain resonances in other exotic sectors such as (charm = 1; strangeness = -1), (charm = 2; strangeness = 0, 1). This 'flavor-exotic' states are interpreted as and molecular states and have not been observed yet. The observation of these peculiar states is a challenge for the experimentalist., 2013年, 54, 7-10, 1259, 1262, 研究論文（学術雑誌）, 10.1007/s00601-012-0583-z
- 査読あり, 英語, Physical Review D - Particles, Fields, Gravitation and Cosmology, Negative parity Λ and Σ resonances coupled to pseudoscalar and vector mesons, Khemch; ani, K.P.; Mart{\'i}nez Torres, A.; Nagahiro, H.; Hosaka, A., 2012年06月12日, 85, 11, 114020, 114020, 研究論文（学術雑誌）, 10.1103/PhysRevD.85.114020
- 査読あり, 英語, EPJ Web Conf., Formation of deeply bound pionic atoms in Sn isotopes, Ikeno, Natsumi; Nagahiro, Hideko; Jido, Daisuke; Hirenzaki, Satoru, We study the formation of deeply bound pionic atoms in the (d,He-3) reactions theoretically and show the energy spectra of the emitted He-3 at finite angles. We find that the different combinations of the pion-bound and neutron-hole states dominate the formation spectra at different scattering angles because of the matching condition of the reaction. We conclude that the observation of the (d,He-3) reaction at finite angles will provide the systematic information of the pionic bound states in each nucleus, and it will help to develop the study of the pion properties and the partial restoration of chiral symmetry in nuclei., 2012年, 37, 09018, 09018, 研究論文（学術雑誌）, 10.1051/epjconf/20123709018
- 査読あり, 英語, EPJ Web Conf., eta' meson under partial restoration of chiral symmetry in nuclear medium, Jido, Daisuke; Nagahiro, Hideko; Hirenzaki, Satoru; Sakai, Shuntaro, We shed light upon the eta ' mass in nuclear matter in the context of partial restoration of chiral symmetry, pointing out that the U-A ( 1) anomaly effects causes the eta '-eta mass difference necessarily through the chiral symmetry breaking As a consequence, it is expected that the eta ' mass is reduced by order of 100 MeV in nuclear matter where partial restoration of chiral symmetry takes place. The discussion given here is based on Ref. [1], 2012年, 37, 09019, 09019, 研究論文（学術雑誌）, 10.1051/epjconf/20123709019
- 査読あり, 英語, EPJ Web Conf., Formation of eta-prime(958) mesic nuclei, Hirenzaki, Satoru; Jido, Daisuke; Nagahiro, Hideko, In this report, we show the theoretical results of the formation spectra of the η′-nucleus systems in the (p,d) reactions based on the latest theoretical considerations of the η′ properties in nucleus. The results shown here are important to give predictions and supports to the future experiment, and to make clear relations between the η′ mesic nucleus formation spectra and the modifications of the η′ properties at finite density, which will give us new information on the η′ mass generation mechanism., 2012年, 37, 02001, 02001, 研究論文（学術雑誌）, 10.1051/epjconf/20123702001
- 査読あり, 英語, EPJ Web Conf., Hadron resonances with coexistence of different natures, Hosaka, Atsushi; Hyodo, Tetsuo; Jido, Daisuke; Nagahiro, Hideko; Nawa, Kanabu; Ohkoda, Shunsuke; Ozaki, Sho; Yamaguchi, Yasuhiro; Yasui, Shigehiro, We discuss coexistence/mixing of different natures of hadronic composite (molecule) and elementary (quark-intrinsic) ones in hadron resonances. The discussions here are based on our previous publications on the origin of hadron resonances [1], exotic $\\bar{D}$ meson-nucleons as hadronic composites containing one anti-heavy quark [2], and the study of a1 as a typical example to show explicitly the mixing of the two different natures [3]. In all cases, interactions are derived from the chiral dynamics of the light flavor sector. These interactions generate in various cases hadronic composite/molecule states, serving varieties of structure beyond the conventional quark model. © Owned by the authors, published by EDP Sciences, 2012., 2012年, 20, 01005, 01005, 研究論文（学術雑誌）, 10.1051/epjconf/20122001005
- 査読あり, 英語, EPJ Web of Conferences, Spectroscopy of η′ -nucleus bound states at GSI-SIS, Fujioka H; Itahashi K; Geissel H; Hayano R.S; Hirenzaki S; Itoh S; Jido D; Metag V; Nagahiro H; Nanova M; Nishi T; Okochi K; Outa H; Suzuki K; Suzuki T; Tanaka Y.K; Weick H, The η′ meson mass may be reduced due to partial restoration of chiral symmetry. If this is the case, an η′-nucleus system may form a nuclear bound state. We plan to carry out a missing-mass spectroscopy experiment with the 12C(p,d) reaction at GSI-SIS. Peak structures corresponding to such a bound state may be observed even in an inclusive measurement, if the decay width is narrow enough., 2012年, 37, 02005, 02005, 研究論文（学術雑誌）, 10.1051/epjconf/20123702005
- 査読あり, 英語, Prog. Theor. Phys., Feasibility Study of Observing eta' Mesic Nuclei with (p,d) Reaction, Itahashi, Kenta; others, A novel method is proposed to measure eta' (958) meson bound states in C-11 nuclei by missing mass spectroscopy of the C-12(p, d) reaction near the eta' production threshold. It is shown that peak structures will be observed experimentally in an inclusive measurement in case that the in-medium eta' mass reduction is sufficiently large and that the decay width of eta' mesic states is narrow enough. Such a measurement will be feasible with the intense proton beam supplied by the SIS synchrotron at GSI combined with the good energy resolution of the fragment separator FRS., 2012年, 128, 3, 601, 613, 研究論文（学術雑誌）, 10.1143/PTP.128.601
- 査読あり, 英語, Phys. Rev. C, Nuclear bound state of eta'(958) and partial restoration of chiral symmetry in the eta' mass, Jido, Daisuke; Nagahiro, Hideko; Hirenzaki, Satoru, The in-medium mass of the eta' meson is discussed in a context of partial restoration of chiral symmetry in nuclear medium. The eta' mass is expected to be reduced by an order of 100 MeV at the saturation density. The reduction is a consequence of the suppression of the anomaly effect on the eta' mass induced by partial restoration of chiral symmetry. This strong attraction in eta' nuclear systems does not accompany large absorption of eta' into nuclear matter. This leads to the possibility of so narrow bound states of the eta' meson in nuclei to be seen in hadronic reactions with light nuclear targets., 2012年, 85, 3, 032201, 032201, 研究論文（学術雑誌）, 10.1103/PhysRevC.85.032201
- 査読あり, 英語, Phys. Lett. B, eta-prime nucleus optical potential and possible eta-prime bound states, Nagahiro, H.; Hirenzaki, S.; Oset, E.; Ramos, A., Starting from a recent model of the eta'N interaction, we evaluate the eta'-nucleus optical potential, including the contribution of lowest order in density, t rho/2m(eta'), together with the second-order terms accounting for eta' absorption by two nucleons. We also calculate the formation cross section of the eta' bound states from (pi(+), p) reactions on nuclei. The eta'-nucleus potential suffers from uncertainties tied to the poorly known eta'N interaction, which can be partially constrained by the experimental modulus of the eta'N scattering length and/or the recently measured transparency ratios in eta' nuclear photoproduction. Assuming an attractive interaction and taking the claimed experimental value vertical bar a(eta'N)vertical bar = 0.1 fm, we obtain an eta' optical potential in nuclear matter at saturation density of V eta' = -(8.7 + 1.8i) MeV, not attractive enough to produce eta' bound states in light nuclei. Larger values of the scattering length give rise to deeper optical potentials, with moderate enough imaginary parts. For a value vertical bar a(eta'N)vertical bar = 0.3 fm, which can still be considered to lie within the uncertainties of the experimental constraints, the spectra of light and medium nuclei show clear structures associated to eta'-nuclear bound states and to threshold enhancements in the unbound region. (C) 2012 Elsevier B.V. All rights reserved., 2012年, 709, 1-2, 87, 92, 研究論文（学術雑誌）, 10.1016/j.physletb.2012.01.061
- 査読無し, 英語, J. Phys. Conf. Ser., Vector- and Pseudoscalar-baryon coupled channel systems, Khemchani, K.P.; Martinez Torres, A.; Kaneko, H.; Nagahiro, H.; Hosaka, A., In this manuscript, I will report the details of our recent work on the vector meson-baryon (VB) interaction, which we studied with the motivation of finding dynamical generation of resonances in the corresponding systems. We started our study by building a formalism based on the hidden local symmetry and calculating the leading order contributions to the scattering equations by summing the diagrams with: (a) a vector meson exchange in the t-channel (b) an octet baryon exchange in the s-, u-channels and (c) a contact interaction arising from the part of the vector meson-baryon Lagrangian which is related to the anomalous magnetic moment of the baryons. We find the contribution from all these sources, except the s-channel, to be important. The amplitudes obtained by solving the coupled channel Bethe-Salpeter equations for the systems with total strangeness zero, show generation of one isospin 3/2, spin 1/2 resonance and three isospin 1/2 resonances: two with spin 3/2 and one with spin 1/2. We identify these resonances with Delta (1900) S-31, N* (2080) D-13, N* (1700) D-13, and N* (2090) S-11, respectively. We have further extended our study by including pseudoscalar meson-baryon (PB) as the coupled channels of VB systems. For this, we obtain the PB -> VB amplitudes by using the Kroll-Ruddermann term where, considering the vector meson dominance phenomena, the photon is replaced by a vector meson. The calculations done within this formalism reveal a very strong coupling of the VB channels to the low-lying resonances like Lambda (1405) and Lambda (1670), which can have important implications on certain reactions producing them. In addition to this, we find that the effect of coupling the higher mass states to the lighter channels is not restricted to increasing the width of those states, it can be far more strong., 2012年, 374, 012007, 012007, 研究論文（学術雑誌）, 10.1088/1742-6596/374/1/012007
- 査読あり, 英語, The European Physical Journal A, Pionic atom spectroscopy in the (d,3 He) reaction at finite angles, N. Ikeno; H. Nagahiro; S. Hirenzaki, We study the formation of deeply bound pionic atoms in the (d, He-3) reactions theoretically and show the energy spectra of the emitted He-3 at finite angles, which are expected to be observed experimentally. We find that the different combinations of the pion-bound and neutron-hole states dominate the spectra at different scattering angles because of the matching condition of the reaction. We conclude that the observation of the (d, He-3) reaction at finite angles will provide the systematic information of the pionic bound states in each nucleus and will help to develop the study of the pion properties and the partial restoration of chiral symmetry in nuclei., 2011年12月, 47, 12, 161, 161, 研究論文（学術雑誌）, 10.1140/epja/i2011-11161-9
- 査読あり, 英語, Physical Review D - Particles, Fields, Gravitation and Cosmology, Coupling vector and pseudoscalar mesons to study baryon resonances, Khemch; ani, K.P.; Mart{\'i}nez Torres, A.; Kaneko, H.; Nagahiro, H.; Hosaka, A., 2011年11月15日, 84, 9, 094018, 094018, 研究論文（学術雑誌）, 10.1103/PhysRevD.84.094018
- 査読あり, 英語, AIP Conf. Proc., Vector meson-baryon interaction to study dynamical generation of resonances, Khemch; ani, K.P.; Hosaka, A.; Kaneko, H.; Nagahiro, H., With the motivation to find dynamical generation of resonances, we study vector-meson baryon interaction by taking s-, t-, u-channel diagrams and a contact interaction into account. A comparison of the different contributions obtained from these diagrams is done in the SU(2) limit, which shows that these diagrams could be equally important. We find it worthwhile to pay attention to the structure of the total interaction between the two non-zero spin particles which possess similar masses and find spin dependent interaction similar to the nucleon-nucleon case., 2011年, 1388, 1, 310, 313, 研究論文（学術雑誌）, 10.1063/1.3647396
- 査読あり, 英語, AIP Conf. Proc., A study of mixing properties of a1(1260) meson, Nagahiro, H.; Nawa, K.; Ozaki, S.; Jido, D.; Hosaka, A., We develop a practical method to analyze the mixing structure of hadrons consisting of two components of quark composite and hadronic composite by taking the a(1)(1260) meson as an example. We also make reference to the large N-c procedure and its limitation for the classification of such a mixed state., 2011年, 1388, 1, 302, 305, 研究論文（学術雑誌）, 10.1063/1.3647394
- 査読あり, 英語, AIP Conf. Proc., Structure and formation of eta- and pi-nucleus systems, Hirenzaki, Satoru; Ikeno, Natsumi; Jido, Daisuke; Nagahiro, Hideko, In this article, we review recent research activities on the structure and formation of the eta mesic nuclei and the pionic atoms., 2011年, 1388, 1, 495, 501, 研究論文（学術雑誌）, 10.1063/1.3647438
- 査読あり, 英語, Phys. Rev. D, Decay of vector-vector resonances into $γ$ and a pseudoscalar meson, Molina, R.; Nagahiro, H.; Hosaka, A.; Oset, E., We study the decay of dynamically generated resonances from the interaction of two vectors into a gamma and a pseudoscalar meson. The dynamics requires anomalous terms involving vertices with two vectors and a pseudoscalar, which renders it special. We compare our result with data on K(2)*(+) (1430) -> K(+) gamma and K(2)*(0) (1430) -> K(0) gamma and find a good agreement with the data for the K(2)*(+) (1430) case and a width considerably smaller than the upper bound measured for the K(2)*(0) (1430) meson. We also investigate the decay into pi(+) gamma of one a(2) state, tentatively associated to the a(2)(1320), obtaining qualitative agreement with data., 2011年, 83, 9, 094030, 094030, 研究論文（学術雑誌）, 10.1103/PhysRevD.83.094030
- 査読あり, 英語, Phys. Rev. D, Composite and elementary natures of $a_1(1260)$ meson, Nagahiro, H.; Nawa, K.; Ozaki, S.; Jido, D.; Hosaka, A., We develop a practical method to analyze the mixing structure of hadrons consisting of two components of quark composite and hadronic composite. As an example, we investigate the properties of the axial vector meson a(1)(1260) and discuss its mixing properties quantitatively. We also make reference to the large N-c procedure and its limitation for the classification of such a mixed state., 2011年, 83, 11, 111504, 111504, 研究論文（学術雑誌）, 10.1103/PhysRevD.83.111504
- 査読あり, 英語, Prog. Theor. Phys., Precision Spectroscopy of Deeply Bound Pionic Atoms and Partial Restoration of Chiral Symmetry in Medium, Ikeno, Natsumi; Kimura, Rie; Yamagata-Sekihara, Junko; Nagahiro, Hideko; Jido, Daisuke; Itahashi, Kenta; Geng, Li-Sheng; Hirenzaki, Satoru, We study theoretically the formation spectra of deeply bound pionic atoms expected to be observed by experiments with high energy resolution at RIBF/RIKEN, and we discuss in detail the possibilities to extract new information on the pion properties at finite density from the observed spectra, which may provide information on partial restoration of chiral symmetry in medium. We find that the non-yrast pionic states such as 2s are expected to be seen in the (d,He-3) spectra, which will be helpful to reduce uncertainties of the theoretical calculations in the neutron wave functions in nucleus. The observation of the 2s state with the ground is state is also helpful to reduce the experimental uncertainties associated in the calibration of the absolute excitation energy. We find that the nuclear densities probed by atomic pions are quite stable and almost constant for various atomic states and various nuclei. Effects of the pion wave function renormalization to the formation spectra are also evaluated., 2011年, 126, 3, 483, 509, 研究論文（学術雑誌）, 10.1143/PTP.126.483
- 査読あり, 英語, Phys. Rev. C, Formation of Heavy Meson Bound States by Two Nucleon Pick-up Reactions, Ikeno, N.; Yamagata-Sekihara, J.; Nagahiro, H.; Jido, D.; Hirenzaki, S., We develop a model to evaluate the formation rate of the heavy mesic nuclei in two-nucleon pick-up reactions and apply it to the (6)Li target cases for the formation of heavy meson-alpha bound states, as examples. The existence of the quasideuteron in the target nucleus is assumed in this model. It is found that mesic nuclei formation in recoilless kinematics is possible even for heavier mesons than the nucleon in two-nucleon pick-up reactions. We find the formation rate of the meson-alpha bound states can be around half of the elementary cross sections at the recoilless kinematics with small distortions., 2011年, 84, 5, 054609, 054609, 研究論文（学術雑誌）, 10.1103/PhysRevC.84.054609
- 査読無し, 英語, Int. J. Mod. Phys. A, A theoretical model for formation of eta- He-4 bound state by d + d reaction, Hirenzaki, Satoru; Nagahiro, Hideko; Jido, Daisuke, In this article, we consider theoretically the d+d reaction for the formation of the eta-He-4 bound state. We evaluate the formation rate and show expected spectra using a simple theoretical model with Green's function method., 2011年, 26, 3-4, 444, 449, 研究論文（学術雑誌）, 10.1142/S0217751X11051809
- 査読あり, 英語, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, Formation of η-mesic nuclei by (π, N) reaction at J-PARC, H. Nagahiro; S. Hirenzaki; D. Jido, We study the formations of of the η-nucleus systems in the (πN) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including the Japan Proton Accelerator Research Complex, to investigate the η-nucleus interaction. Based on the N*(1535) dominance in the ηN system, the η-mesic nuclei are suitable systems for the study of in-medium properties of the N*(1535) baryon resonance, such as reduction of the mass difference of N and N* in the nuclear medium, which affects the level structure of the η and N*-hole modes. We find that clear information on the in-medium N*- and η-nucleus interactions can be obtained through the formation spectra of the η-mesic nuclei., 2010年01月01日, 141, 149, 論文集(書籍)内論文, 10.1142/9789814313933_0018
- 査読あり, 英語, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, Regge approach in charged k* photoproduction, S. Ozaki; A. Hosaka; H. Nagahiro, We investigate ϒp → K*+A reaction within a Regge approach. For the gauge invariance of the scattering amplitude, we reggeize the s-channel and contact term amplitudes as well as the t-channel amplitude. We obtain the decreasing behavior of the total cross section as the CLAS's preliminary data show. We also calculate spin density matrices, and find clear differences between our Regge model and the previous Feynman (isobar) model., 2010年01月01日, 188, 192, 論文集(書籍)内論文, 10.1142/9789814313933_0024
- 査読あり, 英語, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, Meson properties in nuclear medium, S. Hirenzaki; N. Ikeno; H. Nagahiro; J. Yamagata-Sekihara, We discuss the interests and difficulties of the studies of the meson-nucleus bound systems. As recent topics, we briefly explain the research activities of the deeply bound pionic atoms, the η'(958) mesic nuclei, and the ϕ mesic nuclei., 2010年01月01日, 134, 140, 論文集(書籍)内論文, 10.1142/9789814313933_0017
- 査読あり, 英語, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, Deeply bound pionic states in Sn at RIKEN RI beam factory, N. Ikeno; H. Nagahiro; S. Hirenzaki; J. Yamagata-Sekihara; D. Jido, We study the structure of pionic atoms in l21Sn, for which a new experiment will be performed at RIKEN RI Beam Factory. We evaluate numerically the effective nuclear densities probed by pion and potential parameter dependence of the binding energies and widths., 2010年01月01日, 206, 210, 論文集(書籍)内論文, 10.1142/9789814313933_0028
- 査読あり, 英語, Phys. Rev. C, Charged K* Photoproduction in a Regge model, Ozaki, Sho; Nagahiro, Hideko; Hosaka, Atsushi, We investigate the gamma p -> K*(+)Lambda reaction within a Regge approach. For the gauge invariance of the scattering amplitude, we reggeize the s channel and contact-term amplitudes as well as the t-channel amplitude. We obtain a decreasing behavior of the total cross section as the CLAS's preliminary data show. We also calculate spin density matrices and find clear differences between our Regge model and the previous Feynman (isobar) model., 2010年, 81, 3, 035206, 035206, 研究論文（学術雑誌）, 10.1103/PhysRevC.81.035206
- 査読あり, 英語, Prog. Theor. Phys. Suppl., Theoretical study of formation rates of eta-, eta'- and omega-mesic nuclei induced by the pion beam, Nagahiro, Hideko, We present the theoretical study on formation rates of the eta-, eta'- and omega-meson-nucleus systems induced by the (pi, N) reactions on nuclear targets. For the eta-mesic nuclei, we can study the in-medium properties of the N*(1535) baryon resonance. As for the eta'(958) meson-nucleus system, the in-medium U(A) (1) anomaly effect might be observed. We can also know the in-medium behavior of the omega meson by the (pi, N) reaction with nuclear targets. We conclude that valuable information on mesons in the medium can be extracted from global structures of the missing mass spectra in the (pi, N) reaction., 2010年, 186, 186, 316, 324, 研究論文（学術雑誌）, 10.1143/PTPS.186.316
- 査読あり, 英語, Nucl. Phys. A, Phi photoproduction in a coupled-channel approach, Ozaki, S.; Nagahiro, H.; Hosaka, A.; Scholten, O., We investigate photoproduction of phi-mesons off protons within a coupled-channel effective-Lagrangian method which is based on the K-matrix approach. We take into account pi N, rho N, eta N, K Lambda, K Sigma, K Lambda (1520) and phi N channels. Especially we focus on K Lambda(1520) channel. We also introduce a nucleon resonance which couples to phi N and K Lambda (1520) channels. We find that coupled-channel effects are not sizable at very forward angle (theta = 0) and the resonance can reproduce a peak structure of the correct magnitude at the right energy. We also investigate the effects of coupled channels and the resonance on the angular distribution for phi-photoproduction., 2010年, 835, 1-4, 321, 324, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2010.01.209
- 査読無し, 英語, AIP Conf. Proc., Scalar, Axial-Vector and Tensor Resonances from the $ρ D^*$, $ω D^*$ Interaction in the Hidden Gauge Formalism, Molina, R.; Nagahiro, H.; Hosaka, A.; Oset, E., We apply a unitary approach together with a set of hidden-gauge Lagrangians to study the vector-vector interaction. We study the case of the p(omega)D* interaction within the model. In I = 1/2 we get strong enough attraction to bind the system. Concretely, we get one resonance for each spin J = 0,1,2. For J = 1 and 2 these resonances can be easily identified with the D* (2460) and D* (2640). Whereas the state for J = 0 with mass M similar to 2600 MeV is a prediction of the model. In I = 3/2 we get a repulsive interaction and hence no exotic dynamically generated states., 2010年, 1257, 1, 447, 451, 研究論文（学術雑誌）, 10.1063/1.3483368
- 査読無し, 英語, AIP Conf. Proc., Formation of eta mesic nuclei at JPARC and COSY, Hirenzaki, Satoru; Nagahiro, Hideko; Jido, Daisuke, In this article, we consider theoretically the formation reactions of the eta mesic nuclei at JPARC and COSY., 2010年, 1322, 1, 28, 35, 研究論文（学術雑誌）, 10.1063/1.3541994
- 査読無し, 英語, Acta Phys. Polon. B, Formation of \eta -Mesic Nuclei, Hirenzaki, Satoru; Nagahiro, Hideko; Jido, Daisuke, In this paper, we briefly introduce the interests and the recent research activities on the eta-mesic nuclei. We also mention the activities on the eta'(958)-mesic nucleus formation., 2010年, 41, 10, 2211, 2220, 研究論文（学術雑誌）
- 査読あり, 英語, Chin. Phys. C, Reaction dynamics for photoproductions of baryon resonances, Hosaka, A.; Hyodo, T.; Jido, D.; Kim, H.C.; Nagahiro, H.; Nam, S.I.; Oka, M.; Ozaki, S., The study of exotic structure of hadrons is fully achieved when reaction dynamics of the associated hadron productions is well understood. We employ as the standard mechanism the effective Lagrangian method and investigate several physical observables within the framework. The parameters are constrained by microscopic description of hadrons. We discuss photoproductions of kaon associated with the ground state Λ(1116) and its resonances Λ(1405) and Λ(1520). In the former example we emphasize the meson cloud effect which significantly renormalizes the phenomenological parameters, while in the latter we discuss the features of the standard method. Finally we discuss briefly the production of ηπ associated with the nucleon resonance N(1535) for the study of chiral symmetry of baryons. © 2009 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd., 2009年, 33, 12, 1167, 1174, 研究論文（学術雑誌）, 10.1088/1674-1137/33/12/019
- 査読あり, 英語, Phys. Rev. D, The gamma gamma decay of the f(0)(1370) and f(2)(1270) resonances in the hidden gauge formalism, Nagahiro, H.; Yamagata-Sekihara, J.; Oset, E.; Hirenzaki, S.; Molina, R., Using recent results obtained within the hidden gauge formalism for vector mesons, in which the f0(1370) and f2(1270) resonances are dynamically generated resonances from the ρρ interaction, we evaluate the radiative decay of these resonances into γγ. We obtain results for the width in good agreement with the experimental data for the f2(1270) state and a width about a factor 2 smaller for the f0(1370) resonance, which is also in agreement with the data of the Crystal Ball Collaboration and with the more recent ones from the Belle Collaboration, which, however, have a very large uncertainty. © 2009 The American Physical Society., 2009年, 79, 11, 114023, 114023, 研究論文（学術雑誌）, 10.1103/PhysRevD.79.114023
- 査読あり, 英語, Phys. Rev. C, Formation of eta-mesic nuclei by (pi,N) reaction and N*(1535) in medium, Nagahiro, Hideko; Jido, Daisuke; Hirenzaki, Satoru, We calculate formation spectra of the η-nucleus systems in the (π,N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including the Japan Proton Accelerator Research Complex, to investigate the η-nucleus interaction. Based on the N*(1535) dominance in the ηN system, the η-mesic nuclei are suitable systems for the study of in-medium properties of the N*(1535) baryon resonance, such as reduction of the mass difference of N and N* in the nuclear medium, which affects the level structure of the η and N*-hole modes. We find that clear information on the in-medium N*- and η-nucleus interactions can be obtained through the formation spectra of the η-mesic nuclei. We also discuss the experimental feasibilities by showing several spectra of the (π,N) reactions calculated with possible experimental settings. Coincident measurements of the Nπ pairs from the N* decays in nuclei help us to reduce backgrounds. © 2009 The American Physical Society., 2009年, 80, 2, 025205, 025205, 研究論文（学術雑誌）, 10.1103/PhysRevC.80.025205
- 査読あり, 英語, Phys. Rev. C, Formation spectra of light kaonic nuclei by in-flight (anti-K, N) reactions with chiral unitary amplitude, Yamagata-Sekihara, J.; Jido, D.; Nagahiro, H.; Hirenzaki, S., We study theoretically the in-flight (K-,N) reactions for the formation of light kaonic nuclear systems to get deeper physical insights on the spectra and to investigate the formation spectra of the reaction that will be observed at new facilities like the Japan Proton Accelerator Research Complex (J-PARC). We show the expected spectra for the formation of the K-pp, K-pn, K-nn, and K - B11 systems that are accessible by the (K-,N) experiments. By considering the conversion part of the Green's function, we show the missing mass spectra of the (K-,N) reactions in coincident with the particle emissions due to K̄ absorption. To calculate the cross sections, we use the so-called Tρ approximation to evaluate the optical potential. As for the amplitude T, we adopt the chiral unitary amplitude of K̄N channel in vacuum for simplicity. The effects of the p-wave optical potential of Σ(1385) channel and the contributions from K̄0 mixing in He3(K-,n) reaction are also evaluated numerically. We also study the behavior of the poles of kaon Green's function in nuclear matter. We conclude that He3(K-,n) and He3(K-,p) reaction spectra in coincident with the πΣ emission may show the structure in the kaon bound region indicating the existence of the unstable kaonic nuclear states. As for the C12(K-,p) spectra with the πΣ emission, we may also observe the structure in the bound region, however, we need to evaluate the medium effects carefully for larger nuclei. © 2009 The American Physical Society., 2009年, 80, 4, 045204, 045204, 研究論文（学術雑誌）, 10.1103/PhysRevC.80.045204
- 査読あり, 英語, Nucl. Phys. A, Meson and Baryon resonances, Oset, E.; others, In this talk I review recent advances on the structure of the meson and baryon resonances which can be dynamically generated from the interaction of mesons or mesons and baryons. Particular emphasis is put on results involving vector mesons, which bring new light into the nature of some of the observed higher mass mesons and baryons and make predictions for new states. © 2009 Elsevier B.V. All rights reserved., 2009年, 827, 1-4, 255C, 260C, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2009.05.050
- 査読あり, 英語, Physical Review D - Particles, Fields, Gravitation and Cosmology, Scalar, axial-vector, and tensor resonances from the ρd*, ωd* interaction in the hidden gauge formalism, Molina, R.; Nagahiro, H.; Hosaka, A.; Oset, E., 2009年, 80, 1, 014025, 014025, 研究論文（学術雑誌）, 10.1103/PhysRevD.80.014025
- 査読無し, 英語, Int. J. Mod. Phys. E, Formation of eta-mesic nuclei by (pi, N) reaction and chiral symmetry for baryons, Nagahiro, Hideko; Jido, Daisuke; Hirenzaki, Satoru, We calculate formation spectra of eta-nucleus systems in (pi, N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including J-PARC, in order to investigate eta-nucleus interactions. Based on the N*(1535) dominance in the eta N system, eta-mesic nuclei are suitable systems for study of in-medium properties of the N* (1535) baryon resonance, such as reduction of the mass difference of N and N* in nuclear medium, which affects level structure of the eta and N*-hole modes. We find that clear information on the in-medium N*- and eta-nucleus interactions can be obtained through the formation spectra of the eta-mesic nuclei., 2009年, 18, 10, 2202, 2206, 研究論文（学術雑誌）, 10.1142/S0218301309014561
- 査読あり, 英語, MODERN PHYSICS LETTERS A, Special Issue: Proceedings for the International Workshop on Chiral Symmetry in Hadron and Nuclear Physics (CHIRAL07) PREFACE, Atsushi Hosaka; Teiji Kunihiro; Takayuki Myo; Hideko Nagahiro, 2008年09月, 23, 27-30, V, VII
- 査読無し, 英語, Prog. Part. Nucl. Phys., Photo- and Electron-Production of Mesons on Nucleons and Nuclei, Oset, E.; others, In these lectures I will show some results obtained with the chiral unitary approach applied to the photo- and electro-production of mesons. The results for the photo-production of eta pi(0)p and K-0 pi(0)Sigma(+), together with related reactions will be shown, having with common denominator the excitation of the Delta(1700) resonance which is one of those dynamically generated in the chiral unitary approach. Then I will show the results obtained for the e(+)e(-) -> phi f(0)(980) reaction which reproduce the bulk of the data except for a pronounced peak, giving support to a new mesonic resonance, X(2175). Results will also be shown for the electromagnetic form factors of the N* (1535) resonance, also dynamically generated in this approach. Finally, I will show some results on the photo-production of the omega in the nuclei, showing that present experimental results claiming a shift of the omega mass in the medium are tied to a particular choice of background and are not conclusive. On the other hand, the same experimental results show unambiguously a huge increase of the omega width in the nuclear medium. (c) 2007 Elsevier B.V. All fights reserved., 2008年, 61, 1, 260, 275, 研究論文（学術雑誌）, 10.1016/j.ppnp.2007.12.024
- 査読あり, 英語, Modern Physics Letters A, Modern Physics Letters A: Preface, A. Hosaka; T. Kunihiro; T. Myo; H. Nagahiro, 2008年, 23, 27-30, v-vii
- 査読あり, 英語, Nucl. Phys. A, Level crossing of particle-hole and mesonic modes in eta mesic nuclei, Jido, D.; Kolomeitsev, E.E.; Nagahiro, H.; Hirenzaki, S., We study eta-meson properties in the infinite nuclear matter and in atomic nuclei with an emphasis on effects of the eta coupling to N* (1535)-nucleon-hole modes. The N* (1535) resonance, which dominates the low-energy eta-nucleon scattering, can be seen as a chiral partner of the nucleon. The change of the chiral mass gap between the N* and the nucleon in a nuclear medium has an impact on the properties of the eta-nucleus system. If the N*-nucleon mass gap decreases with a density increase (chiral symmetry restoration) the calculations show the existence of the resonance state at the energy about 60 MeV and two bound eta-nucleus states with the binding energies about - 80 MeV. These states can have strong effect on predicted cross sections of the 12C(γ, p)11B reaction with eta-meson production. © 2008 Elsevier B.V. All rights reserved., 2008年, 811, 1-2, 158, 178, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2008.07.012
- 査読あり, 英語, Mod. Phys. Lett. A, Structure and formation of kaonic atoms and kaonic nuclei, Yamagata, Junko; Hirenzaki, Satoru; Nagahiro, Hideko; Jido, Daisuke, We study theoretically the in-flight (K-, N) reactions for the formation of (K) over bar NN systems using the microscopic chiral unitary s-wave (K) over barN amplitude to get deeper physical insights on the expected spectra, and to investigate the experimental feasibility of the reaction at J-PARC facility. We show the missing mass spectra of the (K-, N) reactions accompanied by the particle emissions due to (K) over barK absorption in nucleus., 2008年, 23, 27-30, 2528, 2531, 研究論文（学術雑誌）, 10.1142/S0217732308029733
- 査読あり, 英語, Mod. Phys. Lett. A, Study of in-medium properties of N*(1535) and chiral symmetry for baryons through the eta-mesic nuclei formation at J-PARC, Nagahiro, Hideko; Jido, Daisuke; Hirenzaki, Satoru, We investigate the properties of eta-nucleus interaction by postulating the N*(1535) dominance for eta-N system. We evaluate the N*(1535) properties in the nuclear medium using two kinds of chiral models, and find that these two models provide qualitatively different eta-nucleus optical potentials reflecting the quite distinct properties of N*(1535) in these chiral models. Especially, in the chiral doublet model, we can expect to have the level crossing between eta and N*(1535)-hole which is expected to provide the characteristic features for the optical potential and the formation spectra. We find also that the difference of these models can be seen in the formation cross sections of the eta mesic nuclei with (pi(+),p) reaction expected to be performed at J-PARC project., 2008年, 23, 27-30, 2512, 2515, 研究論文（学術雑誌）, 10.1142/S0217732308029691
- 査読あり, 英語, Mod. Phys. Lett. A, The role of the QCD anomaly in kaon photoproduction, Ozaki, Sho; Nagahiro, Hideko; Hosaka, Atsushi, We study the kaon photoproduction associated with the production of the ground state Lambda. We investigate the role of K and K* exchange in the t-channel, which can be tested by the photon asymmetry in comparison with experimental data. We find a significant amount of contribution from the one-loop diagram induced by the gauged Wess-Zumino-Witten term for QCD anomaly. This enable us to use coupling constants which are determined in a microscopic way, unlike the previous phenomenological studies where the K* coupling strengths were treated as a free parameter., 2008年, 23, 27-30, 2325, 2328, 研究論文（学術雑誌）, 10.1142/S0217732308029307
- 査読あり, 英語, Phys. Lett. B, Magnetic interaction induced by the anomaly in kaon-photoproductions, Ozaki, S.; Nagahiro, H.; Hosaka, A., We study the role of magnetic interaction in the photoproduction of the kaon and hyperon. We find that the inclusion of a higher order diagram induced by the Wess-Zumino-Witten term has a significant contribution to the magnetic amplitude, which is compatible to the observed photon asymmetry in the forward angle region. This enables us to use the K* coupling constants which have been determined in a microscopic way rather than the phenomenological ones which differ largely from the microscopic ones. (C) 2008 Elsevier B.V. All rights reserved., 2008年, 665, 4, 178, 181, 研究論文（学術雑誌）, 10.1016/j.physletb.2008.06.020
- 査読あり, 英語, Physical Review C - Nuclear Physics, Formation of deeply bound kaonic atoms in (K-,N) reactions, J. Yamagata; H. Nagahiro; R. Kimura; S. Hirenzaki, We study theoretically the (K-,N) reactions for the formation of the deeply bound kaonic atoms, which were predicted to be quasistable with narrow widths, using the Green's function method. We systematically consider various cases with different target nuclei and energies and find clear signals in the theoretical spectra for all cases considered in this article. The signals show very interesting structures, such as a RESONANCE DIP instead of a resonance peak. We discuss the origins of the interesting structures and the possibilities of obtaining new information on the existence of kaonic nuclei from the spectra of atomic state formations. © 2007 The American Physical Society., 2007年10月31日, 76, 4, 研究論文（学術雑誌）, 10.1103/PhysRevC.76.045204
- その他, Photoproduction of omega and omega in the nuclear medium, Oset, E.; Kaskulov, M.; Nagahiro, H.; Hern; ez, E.; Hirenzaki, S., 2007年10月, 研究論文（学術雑誌）
- 査読あり, 英語, CONDENSED MATTER THEORIES, VOL 21, Exotic mesic atoms for a class of strongly correlated fermi systems, S. Hirenzaki; H. Nagahiro; J. Yamagata, 2007年, 21, 351, +, 研究論文（国際会議プロシーディングス）
- 査読あり, 英語, Phys. Rev. C, Formation of Deeply Bound Kaonic Atoms in (K-,N) Reactions, Yamagata, J.; Nagahiro, H.; Kimura, R.; Hirenzaki, S., We study theoretically the (K-,N) reactions for the formation of the deeply bound kaonic atoms, which were predicted to be quasistable with narrow widths, using the Green's function method. We systematically consider various cases with different target nuclei and energies and find clear signals in the theoretical spectra for all cases considered in this article. The signals show very interesting structures, such as a RESONANCE DIP instead of a resonance peak. We discuss the origins of the interesting structures and the possibilities of obtaining new information on the existence of kaonic nuclei from the spectra of atomic state formations., 2007年, 76, 4, 045204, 045204, 研究論文（学術雑誌）, 10.1103/PhysRevC.76.045204
- 査読あり, 英語, Phys. Rev. C, Study of possible omega bound states in nuclei with the (gamma,p) reaction, Kaskulov, M.; Nagahiro, H.; Hirenzaki, S.; Oset, E., We perform calculations for omega production in nuclei by means of the (gamma,p) reaction for photon energies and proton angles suited to currently running and future experiments in present laboratories. For some cases of possible omega optical potentials, we find that clear peaks are observable when a good resolution in the omega energy is available. We also study the inclusive production of pi(0)gamma in nuclei around the omega energy and find a double hump structure for the energy spectra, with a peak around a pi(0)gamma energy of m(omega)-100 MeV, which could easily be misidentified by a signal of an omega bound state in nuclei, while it is actually due to a different scaling of the uncorrelated pi(0)gamma production and omega production with subsequent pi(0)gamma decay., 2007年, 75, 6, 064616, 064616, 研究論文（学術雑誌）, 10.1103/PhysRevC.75.064616
- 査読あり, 英語, PHYSICAL REVIEW C, eta- and eta '-mesic nuclei and U-A(1) anomaly at finite density, Hideko Nagahiro; Makoto Takizawa; Satoru Hirenzaki, We discuss theoretically the possibility of observing the bound states of the eta and eta(')(958) mesons in nuclei. We apply the NJL model to study the eta and eta(') meson properties at finite density and calculate the formation cross sections of the eta and eta(') bound states with the Green function method for (gamma,p) reaction. We also discuss the experimental feasibility at photon facilities like SPring-8. The contributions due to the omega meson production are also included to obtain the realistic (gamma,p) spectra. We conclude that we can expect to observe resonance peaks in (gamma,p) spectra for the formation of meson bound states and we can deduce new information on eta and eta(') properties at finite density. These observations are believed to be essential to know the possible mass shift of eta(') and deduce new information on the effective restoration of the U-A(1) anomaly in the nuclear medium., 2006年10月, 74, 4, 045203, 研究論文（学術雑誌）, 10.1103/PhysRevC.74.045203
- 査読あり, 英語, Phys. Rev. C, eta- and eta-prime-mesic nuclei and U(A)(1) anomaly at finite density, Nagahiro, Hideko; Takizawa, Makoto; Hirenzaki, Satoru, We discuss theoretically the possibility of observing the bound states of the η and η'(958) mesons in nuclei. We apply the NJL model to study the η and η' meson properties at finite density and calculate the formation cross sections of the η and η' bound states with the Green function method for (γ,p) reaction. We also discuss the experimental feasibility at photon facilities like SPring-8. The contributions due to the ω meson production are also included to obtain the realistic (γ,p) spectra. We conclude that we can expect to observe resonance peaks in (γ,p) spectra for the formation of meson bound states and we can deduce new information on η and η' properties at finite density. These observations are believed to be essential to know the possible mass shift of η' and deduce new information on the effective restoration of the UA(1) anomaly in the nuclear medium. © 2006 The American Physical Society., 2006年, 74, 4, 045203, 045203, 研究論文（学術雑誌）, 10.1103/PhysRevC.74.045203
- 査読あり, 英語, Physical Review C - Nuclear Physics, In-flight (K-,p) reactions for the formation of kaonic atoms and kaonic nuclei using the Green function method, J. Yamagata; H. Nagahiro; S. Hirenzaki, We study theoretically the kaonic atom and kaonic nucleus formations in the in-flight (K-,p) reactions using the Green function method, which is suited to evaluate formation rates both of stable and unstable bound systems. We consider C12 and O16 as the targets and calculate the spectra of the (K-,p) reactions. We conclude that no peak structure resulting from kaonic nucleus formation is expected in the reaction spectra calculated with the chiral unitary kaon-nucleus optical potential. In the spectra with the phenomenological deep kaon-nucleus potential, it may be possible to observe some structures because of the formation of the kaonic nucleus states. For all cases, we find clear signals because of the kaonic atom formations in the reaction spectra, which show very interesting structures, such as the RESONANCE DIP instead of the resonance peak for the atomic 1s state formation. © 2006 The American Physical Society., 2006年, 74, 1, 研究論文（学術雑誌）, 10.1103/PhysRevC.74.014604
- 査読あり, 英語, AIP Conf. Proc., eta-prime(958)-mesic nuclei formation and U(1)A anomaly at finite density, Nagahiro, H.; Takizawa, M.; Hirenzaki, S., We discuss the possibility of producing the bound states of the eta'(958) meson in nuclei theoretically using the the Nambu-Jona-Lasinio (NJL) model. We calculate the formation cross section of the eta' bound states with the Green function method for the (gamma,p) reaction and discuss the experimental feasibility at photon facilities such as SPring-8. We conclude that we can expect to observe resonance peaks in (gamma,p) spectra for the formation of eta' bound states and we can deduce new information on eta' properties at finite density. These observations are believed to be essential to know the possible mass shift of eta' and deduce new information on the effective restoration of the chiral U-A (1) anomaly at finite density., 2006年, 842, 1, 228, 230, 研究論文（学術雑誌）, 10.1063/1.2220233
- 査読あり, 英語, Phys. Rev. C, In-flight (K-,p) reactions for the formation of kaonic atoms and kaonic nuclei in green function method, Yamagata, J.; Nagahiro, H.; Hirenzaki, S., We study theoretically the kaonic atom and kaonic nucleus formations in the in-flight (K-,p) reactions using the Green function method, which is suited to evaluate formation rates both of stable and unstable bound systems. We consider C-12 and O-16 as the targets and calculate the spectra of the (K-,p) reactions. We conclude that no peak structure resulting from kaonic nucleus formation is expected in the reaction spectra calculated with the chiral unitary kaon-nucleus optical potential. In the spectra with the phenomenological deep kaon-nucleus potential, it may be possible to observe some structures because of the formation of the kaonic nucleus states. For all cases, we find clear signals because of the kaonic atom formations in the reaction spectra, which show very interesting structures, such as the RESONANCE DIP instead of the resonance peak for the atomic 1s state formation., 2006年, 74, 1, 014604, 014604, 研究論文（学術雑誌）, 10.1103/PhysRevC.74.014604
- 査読無し, 英語, PROGRESS OF THEORETICAL PHYSICS, Formation of kaonic atoms and kaonic nuclei in in-flight (K-, p) reactions (vol 114, pg 301, 2005), J Yamagata; H Nagahiro; Y Okumura; S Hirenzaki, 2005年10月, 114, 4, 905, 905
- 査読あり, 英語, PHYSICAL REVIEW C, Residual interaction effects on deeply bound pionic states in Sn and Pb isotopes, N Nose-Togawa; H Nagahiro; S Hirenzaki; K Kume, We have studied the residual interaction effects theoretically on the deeply bound pionic states in Pb and Sn isotopes. We need to evaluate the residual interaction effects carefully to deduce the nuclear medium effects for pion properties, which are believed to provide valuable information on nuclear chiral dynamics. The s- and p-wave pi N interactions are used for the pion-nucleon residual interactions. We show that the complex energy shifts are around [(10-20) + i(2-7)] keV for 1s states in Sn, which should be taken into account in the analyses of the high precision data of deeply bound pionic 1s states in Sn isotopes., 2005年06月, 71, 6, 研究論文（学術雑誌）, 10.1103/PhysRevC.71.061601
- 査読あり, 英語, Pentaquark 04, Proceedings, Production of circle dot(+) hypernuclei with the (K+,pi(+)) reaction, H Nagahiro; S Hirenzaki; E Oset; MJV Vacas, We investigate the formation cross sections of the Theta(+)-hypernuclei theoretically. In the (K+,pi(+)) reaction, we obtain the excitation spectra with clearly differentiated peaks corresponding to the Theta(+) bound states., 2005年, 378, 385, 研究論文（国際会議プロシーディングス）
- 査読あり, 英語, Prog. Theor. Phys., Formation of kaonic atoms and kaonic nuclei by in-flight (K-,p) reactions, Yamagata, Junko; Nagahiro, Hideko; Okumura, Yuko; Hirenzaki, Satoru, We theoretically study kaonic atom and kaonic nucleus formation in in-flight (K-,p) reactions for C, O, Si and Ca targets. Deeply bound kaonic atoms were previously predicted to exist as quasi-stable states, and it is expected that they can be observed using certain well-suited experimental methods. Kaonic nuclear states have also been predicted to exist with large decay widths. We evaluate the formation cross sections of kaonic atoms and kaonic nuclei using an effective number approach. We show that indications of kaonic bound states can be observed in the outgoing proton energy spectra., 2005年, 114, 2, 301, 316, 研究論文（学術雑誌）, 10.1143/PTP.114.301
- 査読あり, 英語, Phys. Rev. C, Residual interaction effects on deeply bound pionic states in Sn and Pb isotopes, Nose-Togawa, N.; Nagahiro, H.; Hirenzaki, S.; Kume, K., We have studied the residual interaction effects theoretically on the deeply bound pionic states in Pb and Sn isotopes. We need to evaluate the residual interaction effects carefully to deduce the nuclear medium effects for pion properties, which are believed to provide valuable information on nuclear chiral dynamics. The s- and p-wave πN interactions are used for the pion-nucleon residual interactions. We show that the complex energy shifts are around [(10-20) + i(2-7)] keV for 1s states in Sn, which should be taken into account in the analyses of the high precision data of deeply bound pionic 1s states in Sn isotopes. © 2005 The American Physical Society., 2005年, 71, 6, 061601, 061601, 研究論文（学術雑誌）, 10.1103/PhysRevC.71.061601
- 査読あり, 英語, Nucl. Phys. A, In-medium properties of N*(1535) in chiral models and eta-nucleus interaction, Nagahiro, H.; Hirenzaki, S.; Jido, D., We investigate the properties of η-nucleus interaction by postulating the N*(1535) dominance for η-N system. We evaluate the N*(1535) properties in the nuclear medium using two kinds of chiral models, and find that these two models provide qualitatively different η-nucleus optical potential reflecting the quite distinct properties of N*(1535) in these chiral models. We find also that the difference of these models can be seen in the formation cross sections of the η mesic nuclei with (d, 3He) and (γ,p) reactions, which are expected to be distinguishable in experiments. © 2005 Elsevier B.V. All rights reserved., 2005年, 755, 1-4, 491, 494, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2005.03.061
- 査読あり, 英語, Phys. Rev. Lett., Formation of eta-prime(958) - mesic nuclei and axial U(A)(1) anomaly at finite density, Nagahiro, Hideko; Hirenzaki, Satoru, We discuss the possibility of producing the bound states of the eta(')(958) meson in nuclei theoretically. We calculate the formation cross sections of the eta(') bound states with the Green function method for the (gamma,p) reaction and discuss the experimental feasibility at photon facilities such as SPring-8. We conclude that we can expect to observe resonance peaks in (gamma,p) spectra for the formation of eta(') bound states and we can deduce new information on eta(') properties at finite density. These observations are believed to be essential to know the possible mass shift of eta(') and deduce new information on the effective restoration of the chiral U-A(1) anomaly in the nuclear medium., 2005年, 94, 23, 232503, 232503, 研究論文（学術雑誌）, 10.1103/PhysRevLett.94.232503
- 査読あり, 英語, Nucl. Phys. A, Formation of mesic nuclei by (gamma,p) reactions, Nagahiro, H.; Jido, D.; Hirenzaki, S., We present a theoretical study on formation rates of eta and omega meson-nucleus systems induced by (gamma, p) reactions on nuclear targets at ideal recoilless condition. We find that the smaller distortion effect in the (gamma, p) reaction enables us to investigate properties of the mesons created deeply inside nucleus more clearly. We also consider excitation of scalar-isoscalar (sigma) mode in nucleus in order to investigate spectral enhancement around two-pion threshold caused by partial restoration of chiral symmetry. We conclude that valuable information of meson-nucleus interactions can be extracted from global structure of the missing mass spectra in the (gamma, p) reaction. (c) 2005 Elsevier B.V. All rights reserved., 2005年, 761, 1-2, 92, 119, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2005.07.001
- 査読あり, 英語, Phys. Lett. B, Production of Theta+ hypernuclei with the (K+, pi+) reaction, Nagahiro, H.; Hirenzaki, S.; Oset, E.; Vicente Vacas, M.J., We present results on the production of bound states of Theta(+) in nuclei using the (K+, pi(+)) reaction. By taking into account the states obtained within a wide range of strength of the Theta(+) nucleus optical potential, plus the possibility to replace different nucleons of the nucleus, we obtain an excitation spectra with clearly differentiated peaks. The magnitude of the calculated cross sections is well within reachable range. (c) 2005 Elsevier B.V. All rights reserved., 2005年, 620, 3-4, 125, 130, 研究論文（学術雑誌）, 10.1016/j.physletb.2005.05.084
- 査読あり, 英語, Prog. Theor. Phys. Suppl., eta-mesic nuclei in chiral models, Nagahiro, H.; Jido, D.; Hirenzaki, S., The properties of η-nucleus interaction and their experimental consequences are investigated with η-nucleus optical potentials obtained by postulating the N*(1535) dominance for η-N system. The N*(1535) properties in the nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of N*(1535). We find that these two models provide qualitatively different optical potentials of the η meson, reflecting the different in-medium properties of N*(1535) expected in these two models. In order to compare these models in physical observables, we calculate spectra of (d,3He) reactions for the η mesic nucleus formation with various kinds of target nuclei. We show that the (d, 3He) spectra obtained in these models are significantly different and are expected to be distinguishable in experiments., 2004年, 153, 340, 343, 研究論文（学術雑誌）, 10.1143/PTPS.153.340
- 査読あり, 英語, Physical Review C, η-nucleus interactions and in-medium properties ofN*(1535)in chiral models, H. Nagahiro; D. Jido; S. Hirenzaki, The properties of [Formula Presented]-nucleus interaction and their experimental consequences are investigated with [Formula Presented]-nucleus optical potentials obtained by postulating the [Formula Presented] dominance for [Formula Presented] system. The [Formula Presented] properties in the nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of [Formula Presented] We find that these two models provide qualitatively different optical potentials of the [Formula Presented] meson, reflecting the in-medium properties of [Formula Presented] in these models. In order to compare these models in physical observables, we calculate spectra of [Formula Presented] reactions for the [Formula Presented] mesic nucleus formation with various kinds of target nuclei. We show that the [Formula Presented] spectra obtained in these models are significantly different and are expected to be distinguishable in experiments. © 2003 The American Physical Society., 2003年09月17日, 68, 3, 9, 研究論文（学術雑誌）, 10.1103/physrevc.68.035205
- 査読あり, 英語, Nucl. Phys. A, Medium effects to the N(1535) resonance and eta mesic nuclei, Jido, D.; Nagahiro, H.; Hirenzaki, S., The structure of η-nucleus bound systems (η mesic nuclei) is investigated as one of the tools to study in-medium properties of the N(1535) (N*) resonance. We show that, as a general consequence, the η-nucleus potential has a repulsive core at the nuclear center with an attractive part at the nuclear surface, if sufficient reduction of the mass difference of N and N* stems from the in-medium effects to N*. The (d,3He) spectra are evaluated for the formation of these bound states to investigate the experimental feasibility., 2003年, 721, 665, 668, 研究論文（学術雑誌）, 10.1016/S0375-9474(03)01148-5
- 査読あり, 英語, Physical Review C - Nuclear Physics, Medium effects to the [Formula Presented] resonance and [Formula Presented] mesic nuclei, D. Jido; H. Nagahiro; S. Hirenzaki, The structure of [Formula Presented]-nucleus bound systems [Formula Presented] mesic nuclei) is investigated as one of the tools to study in-medium properties of the [Formula Presented] resonance by using the chiral doublet model to incorporate the medium effects of the [Formula Presented] resonance in a chiral symmetric way. We find that the shape and depth of the [Formula Presented]-nucleus optical potential are strongly affected by the in-medium properties of the [Formula Presented] and nucleon. Especially, as a general feature of the potential, the existence of a repulsive core of the [Formula Presented]-nucleus potential at the nuclear center with an attractive part at the nuclear surface is concluded. We calculate the level structure of bound states in this “central-repulsive and surface-attractive” optical potential and find that the level structure is sensitive to the in-medium properties of the [Formula Presented] The [Formula Presented] spectra are also evaluated for the formation of these bound states to investigate the experimental feasibility. We also make comments on the possible existence of halo-like [Formula Presented] states in [Formula Presented]-unstable halo nuclei. © 2002 The American Physical Society., 2002年, 66, 4, 7, 研究論文（学術雑誌）, 10.1103/PhysRevC.66.045202
- 査読あり, 英語, Phys. Lett. B, Binding energy of scalar bound state by topologically massive interaction: fermion and anti-fermion system with heavy mass, Matsuyama, Toyoki; Nagahiro, Hideko, A bound state problem in a topologically massive quantum electrodynamics is investigated by using a non-perturbative method. We formulate the Bethe-Salpeter equation for scalar bound states composed of massive fermion and anti-fermion pair under the lowest ladder approximation. In a large mass expansion for the (anti-)fermion, we derive the Schrodinger equation and solve it by a numerical method. The energy eigenvalues of bound states are evaluated for various values of a topological mass and also a fermion mass. Then we find a novel logarithmic scaling behaviour of the binding energy m varying the topological mass, fermion mass and also a quantum number. There exists a critical value of the topological mass, beyond which the bound states disappear. As the topological mass decreases, the energy eigenvalues of the bound states, which are negative, also decrease with a logarithmic dependence on the topological mass. A Chern-Simons term gives the bound system a repulsive effect. (C) 2002 Elsevier Science B.V. All rights reserved., 2002年, 536, 1-2, 49, 58, 研究論文（学術雑誌）, 10.1016/S0370-2693(02)01810-5
- 査読あり, 英語, Nucl. Phys. A, Formation of sigma mesic nuclei in (d,t) and (d,He-3) reactions, Hirenzaki, S.; Nagahiro, H.; Hatsuda, T.; Kunihiro, T., We explore the possibility to observe an enhanced 2π correlation in the scalar-isoscalar (σ) channel in nuclei by (d, t) and (d, 3He) reactions to obtain new information on the partial restoration of chiral symmetry in the nuclear medium. The sensitivity of the reaction spectra on the change of the chiral condensate in the nuclear medium is examined. © 2002 Elsevier Science B.V. All rights reserved., 2002年, 710, 1-2, 131, 144, 研究論文（学術雑誌）, 10.1016/S0375-9474(02)01131-4
- その他, Grav. Cosmol., Topological mass versus dynamical mass: Novelty in (2+1)-dimensional space-time, Matsuyama, Toyoki; Nagahiro, Hideko, 2000年, 6, 145, 145, 研究論文（学術雑誌）
- その他, Soryushiron Kenkyu, Formation of sigma mesic nuclei as a probe of chiral restoration in nuclear medium, Hirenzaki, S.; Nagahiro, H.; Hatsuda, T.; Kunihiro, T., 2000年, 102, 5, 185, 190, 研究論文（学術雑誌）
- 査読あり, 英語, Nucl. Phys. A, Physics of mesic atoms and mesic nuclei: Structure and formation, Hirenzaki, S.; Hatsuda, T.; Kume, K.; Kunihiro, T.; Nagahiro, H.; Okumura, Y.; Oset, E.; Ramos, A.; Toki, H.; Umemoto, Y., We have studied the structure and formation of mesic atoms and mesic nuclei theoretically. The latest results on the deeply bound pionic atoms, the kaonic atoms and the sigma states are reported., 2000年, 663, 1-2, 553, 556, 研究論文（学術雑誌）, 10.1016/S0375-9474(99)00654-5
- その他, Phys. Rev. D, A Dynamical mass generation of a two component fermion in the Maxwell-Chern-Simons QED(3): The Lowest ladder approximation, Matsuyama, Toyoki; Nagahiro, Hideko; Uchida, Satoko, 1999年, 60, 105020, 105020, 研究論文（学術雑誌）, 10.1103/PhysRevD.60.105020
- その他, Exotics from Heavy Ion Collisions, Akira Ohnishi; Sungtae Cho; Takenori Furumoto; Tetsuo Hyodo; Daisuke Jido; Che Ming Ko; Su Houng Lee; Marina Nielsen; Takayasu Sekihara; Shigehiro Yasui; Koichi Yazaki; Atsushi Hosaka; Kanchan Khemchandani; Hideko Nagahiro; Kanabu Nawa, 2011年, 研究論文（国際会議プロシーディングス）, 10.1063/1.3647419
- その他, Physical Review C - Nuclear Physics, Erratum: Formation of η-mesic nuclei by the (π,N) reaction and properties of N*(1535) in medium (Physics Review C (2009) 80 (025205)), Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, 2009年09月14日, 80, 3, 研究論文（学術雑誌）, 10.1103/PhysRevC.80.039902
- その他, 2nd International EtaMesonNet Workshop, ETA 2007, η- and η′(958)-mesic nuclei formation and U
A (1) anomaly at finite density in Nambu-Jona-Lasinio model, H. Nagahiro; M. Takizawa; S. Hirenzaki, 2007年, 73, 74, 研究論文（国際会議プロシーディングス） - その他, Progress of Theoretical Physics, Erratum: Formation of kaonic atoms and kaonic nuclei in in-flight (K -, p) reactions (Progress of Theoretical Physics (2005) 114 (301)), Junko Yamagata; Hideko Nagahiro; Yuko Okumura; Satoru Hirenzaki, 2005年10月, 114, 4, 905, 研究論文（学術雑誌）, 10.1143/ptp.114.905
- 日本語, 日本物理学会講演概要集, 一般社団法人 日本物理学会, 結合チャネル効果を考慮したη'(958)中間子原子核, 川本 彩乃; 永廣 秀子; 比連崎 悟, 2018年, 73, 0, 293, 293, 10.11316/jpsgaiyo.73.1.0_293
- 日本語, 日本物理学会講演概要集, 一般社団法人 日本物理学会, 強いエネルギー依存性をもつη'(958)中間子原子核ポテンシャルと束縛状態, 川本 彩乃; 永廣 秀子; 比連崎 悟, 2017年, 72, 0, 179, 179, 10.11316/jpsgaiyo.72.2.0_179
- 日本語, 日本物理学会講演概要集, 一般社団法人 日本物理学会, 結合チャネル法を用いたη'(958)－核子間相互作用, 川本 彩乃; 永廣 秀子; 比連崎 悟,
本研究では、η'中間子と原子核の間のポテンシャルを導出することを目的として、η'N間の散乱についての研究を行う。具体的には、擬スカラー中間子－バリオンの系、ベクトル中間子－バリオンの系を考慮した結合チャネル法を用いて実験値と比較する。その際我々はシングレットのηと核子間の相互作用を導入して、その大きさの決定を試みる。また、中間子核子間に動的に生成されるいくつかの共鳴状態について調べ、どのような共鳴がη'Nチャネルへ強く結合するか議論する。
, 2017年, 72, 0, 210, 210, 10.11316/jpsgaiyo.72.1.0_210 - 査読あり, その他, Progress of Theoretical and Experimental Physics, Structure of double pionic atoms, Akari Tani; Natsumi Ikeno; Daisuke Jido; Hideko Nagahiro; Hiroyuki Fujioka; Kenta Itahashi; Satoru Hirenzaki, We study theoretically the structure of double pionic atoms, in which two negatively charged pions (π-) are bound in the atomic orbits. The double pionic atom is considered to be an interesting system from the point of view of the multi-bosonic systems. In addition, it could be possible to deduce valuable information on the isospin I = 2ππ interaction and the pion-nucleus strong interaction. In this paper, we take into account the ππ strong and electromagnetic interactions, and evaluate the effects on the binding energies by perturbation theory for the double pionic atoms in heavy nuclei. We investigate several combinations of two pionic states and find that the order of magnitude of the energy shifts due to the ππ interaction is around 10 keV for the strong interaction and around 100 keV for the electromagnetic interaction for the ground states., 2021年03月01日, 2021, 3, 研究論文（学術雑誌）, 10.1093/ptep/ptab023
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 21pCC-2 2核子移行反応によるη(958)中間子原子核生成, 宮谷 萌希; 池野 なつ美; 永廣 秀子; 比連崎 悟, 2015年, 70, 282, 282, 10.11316/jpsgaiyo.70.1.0_282
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 21pCC-5 原子核中におけるφ中間子の性質と観測量, 徳永 沙緒莉; 関原(山縣) 淳子; 永廣 秀子; 比連崎 悟, 2015年, 70, 284, 284, 10.11316/jpsgaiyo.70.1.0_284
- 日本語, 日本物理学会講演概要集, 一般社団法人 日本物理学会, Three Body Decay of Λ*c(2625) and Λ*c (2595) with Consideration of π Σ*c in Intermediate States, Arifi A. J.; Nagahiro Hideko; Hosaka Atsushi,
Three body charmed baryon strong decays of Λ*c(2625) and Λ*c(2595) into Λ+c π+ π- are studied in quark model. We take into account sequential processes going through Σc and Σ*c in intermediate states. The total decay rates are sensitive to the coupling of Λ*c with respect to Σc π open channel and to Σ*c π closed channel. Then, by comparing with the experimental data, we can obtain the information of Λ*c structure.
, 2016年, 71, 114, 114, 10.11316/jpsgaiyo.71.2.0_114 - 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22pAC-7 (γ,d)反応によるη'(958)中間子束縛状態の生成, 宮谷 萌希; 池野 なつ美; 永廣 秀子; 比連崎 悟, 2016年, 71, 266, 266, 10.11316/jpsgaiyo.71.1.0_266
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22pAC-5 核内φ中間子の性質の現象論的検討, 徳永 沙緒莉; 関原(山縣) 淳子; 永廣 秀子; 比連崎 悟, 2016年, 71, 265, 265, 10.11316/jpsgaiyo.71.1.0_265
- 英語, 素粒子論研究, 素粒子論グループ 素粒子論研究 編集部, Formation of σ Mesic Nuclei as a Probe of Chiral Restoration in Nuclear Medium(§6. Mesons in Nuclei,Possible Existence of the σ-Meson and Its Implications to Hadron Physics), Hirenzaki Satoru; Nagahiro Hideko; Hatsuda Tetsuo; KUNIHIRO Teiji, We investigate the possibility to observe the properties of the σ channel in nuclei by (d,t) reactions to obtain new information on the partial restoration of chiral symmetry in nuclear medium. The sensitivity of the (d,t) spectra on the chiral symmetry restoration is examined theoretically., 2001年, 102, 5, E185, E190, 10.24532/soken.102.5_E185
- その他, AIP Conference Proceedings, Precision Spectroscopy of Kaonic Helium-3 X-rays at J-PARC, T. Hashimoto; H. Bhang; M. Cargnelli; Seonho Choi; C. Curceanu; S. Enomoto; H. Fujioka; Y. Fujiwara; C. Guaraldo; R. S. Hayano; T. Hiraiwa; M. Iio; K. Inoue; T. Ishikawa; S. Ishimoto; T. Ishiwatari; K. Itahashi; M. Iwasaki; H. Kou; P. Kienle; J. Marton; Y. Matsuda; H. Noumi; H. Ohnishi; S. Okada; H. Outa; A. Romero Vidal; F. Sakuma; M. Sato; M. Sekimoto; H. Shi; D. Sirghi; F. Sirghi; T. Suzuki; K. Tanida; H. Tatsuno; M. Tokuda; D. Tomono; A. Toyoda; K. Tsukada; O. Vazquez Doce; E. Widmann; B. K. Wünschek; T. Yamazaki; J. Zmeskal; Atsushi Hosaka; Kanchan Khemchandani; Hideko Nagahiro; Kanabu Nawa, 2011年, 研究論文（国際会議プロシーディングス）, 10.1063/1.3647458
- その他, AIP Conference Proceedings, Spectroscopic study of Λ(1405) via the in-flight (K[sup −],n) reaction on deuteron, S. Enomoto; S. Ajimura; G. Beer; H. Bhang; M. Bragadireanu; P. Buehler; L. Busso; M. Cargnelli; S. Choi; C. Curceanu; D. Faso; H. Fujioka; Y. Fujiwara; T. Fukuda; C. Guaraldo; T. Hashimoto; R. Hayano; T. Hiraiwa; M. Iio; K. Inoue; N. Ishibashi; T. Ishikawa; S. Ishimoto; T. Ishiwatari; K. Itahashi; M. Iwai; M. Iwasaki; S. Kawasaki; P. Kienle; H. Kou; J. Marton; Y. Matsuda; Y. Mizoi; O. Morra; T. Nagae; H. Noumi; H. Ohnishi; S. Okada; H. Outa; Y. Sada; A. Sakaguchi; F. Sakuma; M. Sato; M. Sekimoto; H. Shi; D. Sirghi; F. Sirghi; S. Suzuki; T. Suzuki; H. Tatsuno; M. Tokuda; D. Tomono; A. Toyoda; K. Tsukada; E. Widmann; T. Yamazaki; H. Yim; K. Yoshida; J. Zmeskal; Atsushi Hosaka; Kanchan Khemchandani; Hideko Nagahiro; Kanabu Nawa, 2011年, 研究論文（国際会議プロシーディングス）, 10.1063/1.3647464
- その他, Physical Review C - Nuclear Physics, Erratum: Coupled-channel analysis for φ photoproduction with Λ(1520) (Phys. Rev. C (2009) 80 (035201)), S. Ozaki; A. Hosaka; H. Nagahiro; O. Scholten, 2010年05月13日, 81, 5, 研究論文（学術雑誌）, 10.1103/PhysRevC.81.059901
- 査読あり, その他, AIP Conference Proceedings, QCD Phase Diagram at Finite Baryon and Isospin Chemical Potentials, T. Sasaki; Y. Sakai; H. Kouno; M. Yahiro; Atsushi Hosaka; Kanchan Khemch; ani; Hideko Nagahiro; Kanabu Nawa, The phase structure of two-flavor QCD is explored for finite temperature T and finite baryon- and isospin-chemical potentials, μ and μ , by using the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model. The PNJL model with the scalar-type eight-quark interaction can reproduce lattice QCD data in the μ -T plane at μ =0. In the μ -μ -T space, the critical endpoint of the chiral phase transition in the μ -T plane at μ =0 moves to the tricritical point of the pion-superfluidity phase transition in the μ -T plane at μ =0 as μ increases. © 2011 American Institute of Physics. B I I B I B B I I B I, 2011年, 1388, 524, 526, 研究論文（学術雑誌）, 10.1063/1.3647444
- 査読あり, 英語, Nucl. Phys. A, Non-mesonic decay of the \ensuremathη -mesic 3He via pd\textrightarrow(3He-\ensuremathη)bound\textrightarrow 3He2\ensuremathγ(6\ensuremathγ) reaction, Skurzok, M.; Hirenzaki, S.; Kinutani, S.; Konishi, H.; Moskal, P.; Nagahiro, H.; Rundel, O., In this article a theoretical model for the η-mesic 3He non-mesonic decay channels is presented. We present the resultant relative momentum distribution of bound 3He-η as well as in-medium branching ratios of η→2γ and η→3π0, which are crucial for the Monte Carlo simulations of measured processes and thus for the experimental data interpretation. As an example we also apply the model for the estimation of the detection efficiency of the WASA-at-COSY detector., 2020年, 993, 121647, 121647, 研究論文（学術雑誌）, 10.1016/j.nuclphysa.2019.121647
- その他, Journal of Physics: Conference Series, Search for η'-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR, Y. K. Tanaka; S. Bagchi; J. Benlliure; T. Dickel; V. Drozd; H. Ekawa; H. Fujioka; H. Geissel; F. Goldenbaum; C. Guo; E. Haettner; M. N. Harakeh; R. S. Hayano; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; B. Kindler; R. Knöbel; D. Kostyleva; N. Kurz; N. Kuzminchuk; B. Lommel; Y. Ma; S. Y. Matsumoto; V. Metag; S. Minami; P. Moskal; I. Mukha; T. Nagae; H. Nagahiro; M. Nakagawa; H. J. Ong; H. Outa; S. Pietri; W. R. Plass; A. Prochazka; S. Purushothaman; C. Rappold; J. Ritman; J. L. Rodríguez-Sánchez; R. Ruber; O. Rundel; T. R. Saito; C. Scheidenberger; R. Sekiya; V. Serdyuk; H. Simon; B. Sitar; M. Skurzok; P. Strmen; B. Sun; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; H. Weick; A. Yamamoto; J. Zhao, We plan a semi-exclusive measurement of the 12C(p,dp) reaction to search for η'-mesic nuclei, aiming at investigating in-medium properties of the η′-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce η′-mesic 11C nuclei via the 12C(p,d)η′⊗11C reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the η′-mesic nuclei. for event selection will provide a high experimental sensitivity to observe η'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported., 2020年12月23日, 1643, 1, 研究論文（国際会議プロシーディングス）, 10.1088/1742-6596/1643/1/012181
- その他, Non-mesonic decay of the $η$-mesic $^3\hspace-0.03cm\mboxHe$ via $pd→(^3\hspace-0.03cm\mboxHe$-$η)_bound→$ $^3\hspace-0.03cm\mboxHe 2γ (6γ$) reaction, Skurzok, M.; Hirenzaki, S.; Kinutani, S.; Konishi, H.; Moskal, P.; Nagahiro, H.; Rundel, O., 2019年08月, 研究論文（学術雑誌）
- その他, Phys. Rev. C, Medium effects to N(1535) resonance and eta mesic nuclei, Jido, D.; Nagahiro, H.; Hirenzaki, S., 2002年, 66, 045202, 045202, 研究論文（学術雑誌）, 10.1103/PhysRevC.66.045202
- 査読あり, 英語, Physical Review D, Excitation spectra of heavy baryons in a quark-diquark model with relativistic corrections, S. Kinutani; H. Nagahiro; D. Jido, The excitation spectra of Λc and Λb baryons are investigated by using a quark-diquark model in which a single-heavy baryon is treated as the bound state of a heavy quark and a scalar diquark. We take two types of relativistic corrections into account for the quark-diquark potential. In the first type, we consider the one-gluon exchange between the heavy quark and one of the light quarks in the diquark. In the second, we consider the one-gluon exchange between a scalar particle and a heavy quark. We find that there is a large difference between the two types of corrections due to different treatments of the internal color structure of the diquark. The relativistic corrections are important for the solution to the string tension puzzle, particularly, the Darwin term makes a large contribution., 2023年11月07日, 108, 9, 研究論文（学術雑誌）, 10.1103/physrevd.108.094011
- その他, Few-Body Systems, Two-Pion Emission Decay of Roper-Like Heavy Baryons, Ahmad Jafar Arifi; Hideko Nagahiro; Atsushi Hosaka; Kiyoshi Tanida, The Roper resonance N(1440) has been a mysterious state in hadron physics for almost 60 years because of its incompatibility with the conventional quark model. In recent years, the candidates of Roper-like state in heavy baryon sectors, e.g., Λ c(2765) and Λ b(6072) , have been observed in experiments although their spin and parity are not directly measured. Interestingly, they share not only similar excitation energies but also decay properties, that may provide a new aspect of the Roper resonance. In this work, we focus on investigating the decay properties of Roper-like heavy baryons. In particular, we show how their two-pion emission decay can be helpful to determine their spin and parity. The experimental confirmation is required to further establish the existence of the Roper-like states. Such measurements can be principally done in the current experimental facilities such as LHC and B-factory experiments., 2021年09月, 62, 3, 研究論文（学術雑誌）, 10.1007/s00601-021-01625-0
MISC
- 査読無し, 日本語, 日本物理学会講演概要集(CD-ROM), 一般社団法人日本物理学会, (p,d)反応の分光によるη′中間子原子核の探索, 田中良樹; AYYAD Y; BENLLIURE J; BRINKMANN K.‐T; FRIEDRICH S; 藤岡宏之; GEISSEL H; GEISSEL H; GELLANKI J; GUO C; GUTZ E; HAETTNER E; HARAKEH M.N; 早野龍五; 東裕子; 比連崎悟; HORNUNG C; 五十嵐洋一; 池野なつ美; 池野なつ美; 板橋健太; 岩崎雅彦; 慈道大介; KALANTAR‐NAYESTANAKI N; KANUNGO R; KNOEBEL R; KNOEBEL R; KURZ N; METAG V; MUKHA I; 永江知文; 永廣秀子; NANOVA M; 西隆博; ONG H.J; PIETRI S; PROCHAZKA A; RAPPOLD C; REITER M.P; SANCHEZ J.L.R, 2015年03月24日, 70, 1, ROMBUNNO.21PCC-1, 281, 10.11316/jpsgaiyo.70.1.0_281
- 査読無し, 英語, AIP Conf. Proc., The structure of baryons. Proceedings, 12th International Conference, Baryons'10,, 永廣秀子, 2011年, 1388
- 査読無し, 英語, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, World Scientific Publishing Co., Preface, Atsushi Hosaka; Takayuki Myo; Hideko Nagahiro; Kanabu Nawa, 2010年01月01日, v, vi, その他, 10.1142/9789814313933_fmatter
- 査読無し, 英語, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, World Scientific Publishing Co., Hadron and nuclear physics 09: Osaka University, Japan, 16-19 November 2009, Atsushi Hosaka; Takayuki Myo; Hideko Nagahiro; Kanabu Nawa, This volume collects papers presented at the international workshop "Hadron-Nuclear Physics 09" held at Osaka, November 16-19, 2009. The series of this workshop has provided opportunities to discuss common interests of hadron and nuclear physics. Hadrons and nuclei show up different layers of phenomena governed by the same dynamics dictated by the fundamental law of the strong interaction, Quantum Chromodynamics (QCD). The basic building blocks of matter, quarks and gluons, are confined in hadrons, generating their masses dynamically and breaking chiral symmetry spontaneously. The latter is the origin of the presence of the pion which governs the essential part of the nuclear interaction. Therefore, the common key words are chiral symmetry and pions. This volume contains reports of current achievements in hadron physics including exotic multiquark states, meson production reactions and non-linear dynamics of hadrons, and those in nuclear physics clustering phenomena, exotic neutron rich nuclei and the pions in nuclei. As related subjects, applications to astronuclear physics, including accelerator physics and laser physics are also discussed comprehensively., 2010年01月01日, 1, 407, その他, 10.1142/7823
- 査読無し, 英語, World Scientific, Hadron and Nuclear Physics 09, Proceedings of International Workshop on Hadron and Nuclear Physics, "HNP09", 永廣秀子, 2010年
- 査読無し, 英語, Modern Physic Letters A, Chiral symmetry in hadron and nuclear physics. Proceedings, International Workshop, CHIRAL07, Osaka, Japan, November 13-16, 2007., 永廣秀子; 保坂淳他, 2008年, 23, 2201-2623
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aTB-5 深く束縛されたπ中間子原子による核内π中間子の性質の精密研究(27aTB 媒質効果・高エネルギー過程,理論核物理領域), 池野 なつ美; 山縣-関原 淳子; 永廣 秀子; 比連崎 悟, 2014年03月05日, 69, 1, 45, 45
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 30aTA-4 η'生成領域における^<12>C(p,d)反応の微視的輸送模型(JAM)による解析(30aTA 実験核物理領域,理論核物理領域合同 中間子生成・ハドロン構造(合同),実験核物理領域), 東 裕子; 池野 なつ美; 永廣 秀子; 比連崎 悟; 藤岡 宏之; 板橋 健太; 田中 良樹, 2014年03月05日, 69, 1, 101, 101
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 30aTA-3 FAIR Super-FRSにおけるη'中間子原子核の分光実験に関する検討(30aTA 実験核物理領域,理論核物理領域合同 中間子生成・ハドロン構造(合同),実験核物理領域), 藤岡 宏之; 永江 知文; 山上 大貴; 板橋 健太; 岩崎 雅彦; 應田 治彦; 鈴木 隆敏; 田中 良樹; 西 隆博; 早野 龍五; 渡辺 珠以; 五十嵐 洋一; 池野 なつ美; 永廣 秀子; 東 裕子; 比連崎 悟; 慈道 大介; Geissel Hans; Weick Helmut; Brinkmann Kai-Thomas; Friedrich Stefan; Metag Volker; Nanova Mariana; 鈴木 謙, 2014年03月05日, 69, 1, 101, 101
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22pSH-2 有効模型を用いたη'(958)核子間相互作用とη'(958)中間子原子核(エキゾチックハドロン,理論核物理領域), 日向 彩夏; 永廣 秀子; 比連崎 悟, 2013年08月26日, 68, 2, 44, 44
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22pSH-1 Formation spectra of deeply bound pionic atoms in Green's Function Method, 池野 なつ美; 山縣-関原 淳子; 永廣 秀子; 比連崎 悟, 2013年08月26日, 68, 2, 44, 44
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aHC-15 FAIRにおけるη'中間子束縛状態探索実験の概要(27aHC 実験核物理領域,理論核物理領域合同 ハイパー核・ストレンジネス・中間子生成・ハドロン構造(合同),実験核物理領域), 板橋 健太; Friedrich Stefan; 藤岡 宏之; Geissel Hans; 早野 龍五; 比連崎 悟; 伊藤 聖; 慈道 大介; Metag Volker; 永廣 秀子; Nanova Mariana; 西 隆博; 大河内 公太; 應田 治彦; 鈴木 謙; 鈴木 隆敏; 田中 良樹; Weick Helmut, 2013年03月26日, 68, 1, 87, 87
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 12pSA-9 Effective nuclear density probed by meson-nucleus systems, 山縣-関原 淳子; 池野 なつ美; 永廣 秀子; 慈道 大介; 比連崎 悟, 2012年08月24日, 67, 2, 39, 39
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 12pSA-8 奇核標的における中間子原子生成(12pSA ハイパー核・ストレンジネス,理論核物理領域), 池野 なつ美; 山縣-関原 淳子; 永廣 秀子; 比連崎 悟, 2012年08月24日, 67, 2, 39, 39
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aXC-8 GSIにおけるη'中間子原子核探索実験計画(27aXC 実験核物理領域,理論核物理領域合同 エキゾチック系・ハドロン構造(合同),実験核物理領域), 藤岡 宏之; 板橋 健太; 應田 治彦; Geissel H.; Weick H.; Metag V.; Nanova M.; 伊藤 聖; 大河内 公太; 鈴木 隆敏; 田中 良樹; 西 隆博; 早野 龍五; 永廣 秀子; 比連崎 悟; 慈道 大介; 鈴木 謙; Widmann E., 2012年03月05日, 67, 1, 112, 112
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aXC-6 η'(958)中間子原子核とカイラル対称性の部分的回復によるη'の質量変化(27aXC 実験核物理領域,理論核物理領域合同 エキゾチック系・ハドロン構造(合同),実験核物理領域), 比連崎 悟; 永廣 秀子; 慈道 大介, 2012年03月05日, 67, 1, 112, 112
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aXC-2 Pionic atom spectroscopy in the (d,^3He) reaction at finite angles(27aXC 実験核物理領域,理論核物理領域合同 エキゾチック系・ハドロン構造(合同),実験核物理領域), 池野 なつ美; 永廣 秀子; 比連崎 悟, 2012年03月05日, 67, 1, 111, 111
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aXC-7 η'(958)中間子に対する二核子吸収の評価とη'中間子原子核生成(27aXC 実験核物理領域,理論核物理領域合同 エキゾチック系・ハドロン構造(合同),実験核物理領域), 永廣 秀子; 比連崎 悟; Oset E.; Ramos A., 2012年03月05日, 67, 1, 112, 112
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 25aGC-13 η'核分光実験のための粒子識別用エアロジェルチェレンコフ検出器の開発(25aGC 測定器II・ターゲット,実験核物理領域), 田中 良樹; 伊藤 聖; 大河内 公太; 鈴木 隆敏; 西 隆博; 早野 龍五; 板橋 健太; 應田 治彦; 藤岡 宏之; Geissel H.; Weick H.; Metag V.; Nanova M.; 永廣 秀子; 比連崎 悟; 慈道 大介; 鈴木 謙; Widmann E.; 田端 誠, 2012年03月05日, 67, 1, 87, 87
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 16pRF-5 カイラル二重項模型によるη中間子原子核の構造と生成(ハドロン構造・反応,理論核物理), 永廣 秀子; 慈道 大介; 比連崎 悟, 2002年08月13日, 57, 2, 36, 36
- その他, 日本物理学会講演概要集(CD-ROM), LEPS2/BGOegg実験におけるη’中間子束縛核探索の実験結果, 冨田夏希; 村松憲仁; 新山雅之; TRAN N.; 橋本敏和; 松村裕二; 永廣秀子; 永廣秀子; 丸山智幸; 石川貴嗣; 小沢恭一郎; 清水肇; 水谷圭吾; 宮部学; 與曽井優, 2020年, 75, 1
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22aYE-5 有限密度系におけるU_A(1)対称性の回復について(22aYE 中間子原子核・ハドロン構造,理論核物理領域), 瀧澤 誠; 永廣 秀子; 比連崎 悟, 2007年08月21日, 62, 2, 43, 43
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22pYE-1 Kaon and Hyperon Photoproduction induced by Wess-Zumino-Witten term, 尾崎 翔; 永廣 秀子; 保坂 淳, 2007年08月21日, 62, 2, 47, 47
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22aYE-2 Possible ω bound states in nuclei produced with the (γ,p) reaction, 永廣 秀子; Kaskulov M.; Oset E.; 慈道 大介; 比連崎 悟, 2007年08月21日, 62, 2, 42, 42
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 21pSD-9 (K^-,N) reactions at J-PARC and Kaon-Nucleus systems, 山縣 淳子; 永廣 秀子; 比連崎 悟, 2006年08月18日, 61, 2, 40, 40
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 20pSC-8 Formation reaction of eta mesic nuclei induced by meson beam, 永廣 秀子; 慈道 大介; 比連崎 悟, 2006年08月18日, 61, 2, 7, 7
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 22aSC-6 有限密度系におけるストレンジ中間子の研究(22aSC ハドロン物質,理論核物理領域), 瀧澤 誠; 永廣 秀子; 比連崎 悟; 岡 真, 2006年08月18日, 61, 2, 18, 18
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 20pSC-7 Possible level crossing of eta and N^*-hole modes in nuclei, 慈道 大介; 永廣 秀子; 比連崎 悟; Kolomeitsev Evigeni E., 2006年08月18日, 61, 2, 7, 7
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 29pWD-3 Kaon bound states in In-flight (K^^-, N) spectra, 山縣 淳子; 永廣 秀子; 比連崎 悟, 2006年03月04日, 61, 1, 71, 71
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 23aBC-8 Pion Properties in Nuclei from Deeply Bound Atomic States(23aBC 実験核物理領域,理論核物理領域合同 ハドロン構造・相互作用・中間子生成(合同),実験核物理領域), 池野 なつ美; 山縣-関原 淳子; 永廣 秀子; 慈道 大介; 比連崎 悟, 2010年03月01日, 65, 1, 95, 95
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 28aZC-3 ベクトル中間子-核子束縛状態としての励起バリオンの研究(28aZC ハドロン相互作用・エキゾチック系,理論核物理領域), 金子 寛弥; 永廣 秀子; 保坂 淳, 2009年03月03日, 64, 1, 47, 47
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27pXF-12 (γ,d)反応による中間子原子核生成(ハイパー核・ストレンジネス(合同)II,27pXF 理論核物理領域,実験核物理領域合同,理論核物理領域), 池野 なつ美; 関原(山縣) 淳子; 永廣 秀子; 慈道 大介; 比連崎 悟, 2009年03月03日, 64, 1, 42, 42
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27pXF-6 Exclusive spectra of in-flight (K^-, N) reaction for light kaonic nucleus formation, 関原(山縣) 淳子; 関原 隆泰; 永廣 秀子; 慈道 大介; 比連崎 悟, 2009年03月03日, 64, 1, 40, 40
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aWG-7 有限密度系におけるスカラー中間子の性質の研究(27aWG ハドロン物質・クォーク物質,理論核物理領域), 瀧澤 誠; 永廣 秀子; 比連崎 悟; 岡 真, 2006年03月04日, 61, 1, 31, 31
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 29pWG-6 η'(958) mesic nuclei with NJL model and the effect of U_A(1) anomaly at finite density, 永廣 秀子; 瀧澤 誠; 比連崎 悟, 2006年03月04日, 61, 1, 43, 43
- その他, 日本物理学会講演概要集(CD-ROM), 中間子原子核生成反応における核構造変化の効果, 絹谷すずな; 平尾まい; 永廣秀子; 慈道大介; 比連崎悟, 2020年, 75, 1
- その他, 日本物理学会講演概要集(CD-ROM), (p,d)反応によるη(958)中間子原子核生成における核変形の効果, 絹谷すずな; 平尾まい; 永廣秀子; 比連崎悟, 2019年, 74, 1
- その他, 日本物理学会講演概要集(CD-ROM), 反陽子原子からの中間子-原子核束縛状態生成, 平尾まい; 絹谷すずな; 永廣秀子; 板橋健太; 比連崎悟, 2019年, 74, 2
- その他, 日本物理学会講演概要集(CD-ROM), 核変形効果を考慮したη(958)中間子原子核の(p,d)反応による生成スペクトル, 絹谷すずな; 平尾まい; 永廣秀子; 慈道大介; 比連崎悟, 2019年, 74, 2
- その他, 日本物理学会講演概要集(CD-ROM), ダブルπ中間子原子の構造, 谷明里; 池野なつ美; 池野なつ美; 比連崎悟; 慈道大介; 永廣秀子; 永廣秀子; 藤岡宏之; 板橋健太, 2019年, 74, 2
- その他, 日本物理学会講演概要集(CD-ROM), η中間子生成閾値付近でのd+d反応からのη-原子核相互作用, 池野なつ美; 永廣秀子; 慈道大介; 比連崎悟, 2017年, 72, 1
- その他, 原子核研究, η’生成領域における12C(p,d)反応の微視的輸送模型(JAM)による解析, 東裕子; 池野なつ美; 池野なつ美; 永廣秀子; 比連崎悟; 藤岡宏之; 板橋健太; 田中良樹, 2015年, 59, Supplement 1
- その他, 原子核研究, 中間子-原子核系で探る核内中間子の性質と強い相互作用の対称性, 比連崎悟; 池野なつ美; 池野なつ美; 永廣秀子, 2015年, 59, Supplement 1
- その他, 日本物理学会講演概要集, η’生成領域における12C(p,d)反応の微視的輸送模型(JAM)による解析, 東裕子; 池野なつ美; 永廣秀子; 比連崎悟; 藤岡宏之; 板橋健太; 田中良樹, 2014年, 69, 1
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 24pZH-2 Radiative decay into γP of the low lying axial-vector mesons, 永廣 秀子; Roca Luis; Oset Euloaio, 2008年02月29日, 63, 1, 53, 53
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aSB-12 偏極光子による核子からのKaon-Hyperon生成(27aSB ハドロン構造・原子核-メソン系,理論核物理領域), 尾崎 翔; 保坂 淳; 永広 秀子, 2007年02月28日, 62, 1, 43, 43
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 13aSE-11 D中間子原子核の生成(13aSE ハイパー核・ストレンジネス・中間子生成,理論核物理領域), 池野 なつ美; 永廣 秀子; 比連崎 悟, 2010年08月18日, 65, 2, 44, 44
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 11pSF-11 d+d反応によるη-^4He束縛状態の生成(11pSF 実験核物理領域,理論核物理領域合同 ストレンジネス・中間子生成・ハドロン構造(合同),実験核物理領域), 比連崎 悟; 永廣 秀子; 慈道 大介, 2010年08月18日, 65, 2, 60, 60
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 11aSB-8 A study of the admixture properties of the α_1(1260) meson, 永廣 秀子; 名和 要武; 尾崎 翔; 慈道 大介; 保坂 淳, 2010年08月18日, 65, 2, 24, 24
- 英語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 17pSG-10 Resonances generated by vector meson-Baryon dynamics, Khemchandani K. P.; Kaneko H.; Nagahiro H.; Hosaka A., 2011年08月24日, 66, 2, 45, 45
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 16pSG-8 核媒質中でのカイラル対称性の部分的回復とη'中間子原子核(16pSG 実験核物理領域,理論核物理領域合同,中間子生成・ハドロン構造(合同),実験核物理領域), 慈道 大介; 永廣 秀子; 比連崎 悟, 2011年08月24日, 66, 2, 69, 69
- 英語, 奈良教育大学紀要. 自然科学, 奈良教育大学, Bound States in Three-dimensional Quantum Electrodynamics with a Chern-Simons Term, Matsuyama Toyoki; Nagahiro Hideko, We investigate a bound state problem in three-dimensional quantum electrodynamics with a Chern-Simons term. The Behte-Salpeter equation is formulated for a fermion-anti-fermion system under a ladder approximation. In a large mass expansion, the Schrodinger equation is derived and solved by a numerical method. The wave functions of bound states and the energy eigenvalues are obtained for various values of a topological mass and also a fermion mass. By inspecting the results, we find interesting features of the bounc system: There exists a critical value of the topological mass, beyond which the bound state disappears. As the topological mass decreases, all the energy of the bound states also decrease logarithmically. The Chern-Simons term gives the bound states a repulsive effect., 2001年10月, 50, 2, 1, 14
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 30pSH-3 (K, N) 反応による K 中間子原子核生成(ハイパー核, 実験核物理), 山縣 淳子; 永廣 秀子; 比連崎 悟, 2004年08月25日, 59, 2, 68, 68
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 12aSH-3 Roper excitation in (d, d') reactions at Td=2.4GeV, 米澤 麻実; 永廣 秀子; 比連崎 悟, 2003年08月15日, 58, 2, 42, 42
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 12aSH-4 Formation of Mesic Nuclei by (γ, p) reactions, 永廣 秀子; 比連崎 悟, 2003年08月15日, 58, 2, 42, 42
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 28pSN-5 η中間原子核で見るバリオンのカイラル対称性と媒質効果, 永廣 秀子; 慈道 大介; 比連 崎悟, 2003年03月06日, 58, 1, 65, 65
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 28aSB-7 Sn 同位体における深く束縛されたπ中間子原子の残留相互作用効果, 外川 直子; 永廣 秀子; 比連崎 悟; 久米 健次, 2003年03月06日, 58, 1, 36, 36
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 28aSB-6 σ中間子-原子核束縛系, 比連崎 悟; 永廣 秀子, 2003年03月06日, 58, 1, 35, 35
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 24pWH-13 有限核密度中におけるU_A(1)anomalyの効果とη'(958)中間子原子核生成(ハドロン物質・クォーク物質,ハドロン構造・反応,理論核物理), 永廣 秀子; 比連崎 悟, 2005年03月04日, 60, 1, 39, 39
- 英語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aZA-10 (K,π)反応によるペンタハイパー核生成(理論核物理,実験核物理合同,エキゾチックハドロン,理論核物理), 比連崎 悟; 永廣 秀子; 0set E.; Vicente M. J.; Vacas A, 2005年03月04日, 60, 1, 53, 53
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27pZA-8 In-flight (K,N)反応によるK中間子-原子核束縛状態の生成(理論核物理,実験核物理合同エキゾチックハドロン,理論核物理), 山縣 淳子; 永廣 秀子; 比連崎 悟, 2005年03月04日, 60, 1, 56, 56
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 28pSJ-5 有限核媒質中におけるη′(958) 生成の可能性(ハドロン物質・クォーク物質, 理論核物理), 永廣 秀子; 比連崎 悟, 2004年08月25日, 59, 2, 34, 34
- 日本語, 日本物理学会講演概要集, 一般社団法人日本物理学会, 27aXC-5 Medium effects to N^*.resonance and η mesic nuclei, 慈道 大介; 永広 秀子; 比連崎 悟, 2002年03月01日, 57, 1, 28, 28
- 英語, 日本物理学会講演概要集, 一般社団法人 日本物理学会, 22pAC-8 GSIにおける(p, d)反応を用いたη'中間子原子核の分光実験, 田中 良樹; Gutz E.; Haettner E.; Harakeh M. N.; 早野 龍五; 東 裕子; 比連崎 悟; Hornung C.; 五十嵐 洋一; 池野 なつ美; 板橋 健太; Ayyad Y.; 岩崎 雅彦; 慈道 大介; Kalantar-Nayestanaki N.; Kanungo R.; Knoebel R.; Kurz N.; Metag V.; Mukha I.; 永江 知文; 永廣 秀子; Benlliure J.; Nanova M.; 西 隆博; Ong H. J.; Pietri S.; Prochazka A.; Rappold C.; Reiter M. P.; Sanchez J. L. R.; Scheidenberger C.; Simon H.; Brinkmann K.-T.; Sitar B.; Strmen P.; Sun B.; 鈴木 謙; Szarka I.; 武智 麻耶; 谷畑 勇夫; 寺嶋 知; 渡辺 珠以; Weick H.; Friedrich S.; Widmann E.; Winfield J. S.; Xu X.; 山上 大貴; Zhao J.; 藤岡 宏之; Geissel H.; Gellanki J.; Guo C., 2016年, 71, 0, 267, 267, 10.11316/jpsgaiyo.71.1.0_267
講演・口頭発表等
- Hideko Nagahiro, 国際, 6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan, Internal structure of Ω(2012) baryon in a coupled-channel approach, シンポジウム・ワークショップパネル（指名）, 英語
- 永廣秀子, Structures and Interactions of Heavy Quark Hadrons, Structure of charmed baryons studied by pionic decays, 2017年03月, 英語, 国際会議
- 永廣秀子; 酒井俊太郎; 保坂淳, 第72回日本物理学会年次大会, Effect of the final state interaction of eta'N on the eta' photoproduction off nucleon, 2017年03月, 日本語, 国内会議
- 永廣秀子, 2016 JAEA/ASRC Reimei Workshop : New exotic hadron matter at J-PARC, Structure of charmed baryons studied by pionic decays, 2016年10月, 英語, Korea, 国際会議
- 永廣秀子; 安井繁宏; 野海博之; 保坂淳, 岡真, 日本物理学会, チャームバリオン励起状態の構造とパイオン放出に崩壊, 2016年09月, 日本語, 国内会議
- 永廣秀子, The 10th APCTP-BLTP/JINR-RCNP-RIKEN Joint Workshop on Nuclear and Hadron Physics, Decays of charmed baryons through pion emission in the quark model, 2016年08月, 英語, RIKEN, 国際会議
- 永廣秀子, Seminar at IFIC, Valencia University, Decays of charmed baryons through pion emission in the quark model, 2016年07月, 英語, 国際会議
- 永廣秀子, The 14th Internatioanal Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016), Formation of possible eta'(958)-nucleus bound states and eta'N interaction, 2016年07月, 英語, 国際会議
- 永廣秀子; 安井繁宏; 吉田哲也; 野海博之; 保坂淳, 岡真, 日本物理学会 第71回年次大会, Decays of charmed baryons through pion emission in the quark model, 2016年03月, 日本語, 国内会議
- 永廣秀子, Mini-Workshop on hadron physics with a variety of flavors, Decays of charmed baryons through pion emission in the quark modek, 2016年02月, 英語, 国際会議
- 永廣秀子, 二国間交流事業共同研究／セミナー, チャームバリオンの崩壊／Mesic nuclei by missing mass specroscopy, 2016年02月, 日本語, 国内会議
- 永廣秀子, 原子核媒質中のハドロン研究 III, 結合チャネル計算によるeta'(958)核子相互作用, 2015年10月, 日本語, 国内会議
- 永廣秀子; 安井繁宏; 吉田哲也; 野海博之; 保坂淳, 岡真, 日本物理学会 2015年秋季大会, クォーク模型によるチャームバリオンの崩壊 --パイオン放出過程-, 2015年09月, 日本語, 国内会議
- 永廣秀子, 1st Hadron Spanish Network Days and Spanish-Japanese JSPS Workshop, eta'(958)-nucleon interaction and possible bound state of eta'N system, 2015年06月, 英語, 国際会議
- 永廣秀子, Hadrons and Hadron Interaction in QCD2015 -Effective Theory and Lattice -, Hadron properties at finite density and specroscopies of mesic nuclei, 2015年03月, 英語, 国際会議
- 永廣秀子, Workshop on "Bound states in QCD and beyond", Elementarity of composite systems, 2015年03月, 英語, St. Goar, Germany, 国際会議
- 永廣秀子, 4th Joint Meeting of the Nuclear Physics Division of the American Physical Society and The Physical Soci ety of Japan, Study for the elementarity of composite systems, 2014年10月, 英語, American Physical Society and Japan Physical Society, 国際会議
- 永廣秀子, EXA2014, Formation of eta'(958) mesic nuclei by (p,d) reaction, 2014年09月, 英語, 国際会議
- 永廣秀子, The 8th APCTP-BLTP JINR Joint Workshop, Do elementary particle survive composite systems ?, 2014年06月, 英語, 国際会議
- 永廣秀子, Hirschegg2014, International Workshop XLII on Gross Properties of Nuclei and Nuclear Excitations, Composite and elementary natures of hadron resonances, 2014年01月, 英語, Hirschegg, Kleinwalsertal, Austria, 国際会議
- 永廣秀子, YITP workshop on "Hadrons in Nucleus", eta'(958)-nucleus bound states and their formations by missing mass spectroscopies, 2013年11月, 英語, Maskawa Hall, Kyoto University, 国際会議
- 永廣秀子, MesonNet Meeting, eta'(958) mesic nuclei by (p,d) reaction, 2013年06月, 英語, Prague, Czech Republic, 国際会議
- 永廣秀子; 保坂淳, 第68回日本物理学会年次大会, Study of mixing properties of mesonic resonances, 2013年03月, 日本語, 広島大学東広島キャンパス, 国内会議
- 永廣秀子, ELPH研究会ダブルメソン生成とバリオン分光, Formation of eta'(958) nucleus bound state, 2012年11月, 日本語, 東北大学電子光理学研究センター, 宮城県仙台市東北大学, 国内会議
- 永廣秀子, XI International Conference on Hypernuclear and Strange Particle Physics, Formation of the eta'(958)-mesic nuclei in missing mass specroscopies, 2012年10月, 英語, Barcelona University, Barcelona, SPAIN, 国際会議
- 永廣秀子, Seminar talk at Technische Universitat Munchen, Formation of eta'(958) mesic nuclei by missing mass spectroscopy, 2012年10月, 英語, Technische Universitat Munchen, ドイツ・ミュンヘン, 国際会議
- 永廣秀子, Seminar talk at GSI, Formation of eta'(958) mesic nuclei by the (p,d) reaction at GSI, 2012年09月, 英語, GSI, ダルムシュタット、ドイツ, 国際会議
- 永廣秀子, The 20th International IUPAP Conference on Few-Body Problems in Physics (FB20), Formation of the eta'(958) meson bound states and chiral symmetry in-meidum, 2012年08月, 英語, IUPAP, Kyushu University, 福岡市国際会議場, 国際会議
- 永廣秀子, 新学術領域「素核宇宙融合」×「新ハドロン」クロスオーバー研究会--多彩な手法でせまるハドロン物理への挑戦--, Composite and elementary natures of mesonic resonances, 2012年07月, 日本語, 新学術領域素核宇宙融合、新ハドロン、名古屋大学, 名古屋大学, 国内会議
- 永廣秀子, 第67回日本物理学会年次大会, eta'(958)中間子に対する二核子吸収の評価とeta'中間子原子核生成, 2012年03月, 日本語, 国内会議
- 永廣秀子, eta' in-medium workshop, Formation spectra of eta' mesic nuclei by the (p,d) reaction, 2012年02月, 英語, 国際会議
- 永廣秀子, Workshop on:\nFuture Prospects of Hadron Physics at J-PARC\nand Large Scale Computational Physics, Formation of eta'(958) meson bound states in nuclei at J-PARC, 2012年02月, 英語, 国際会議
- 永廣秀子, Workshop on:_x000B_ "Elucidation of New Hadrons with a Variety of Flavors“_x000B_- Grant-in-Aid for Scientific Research on Innovative Areas ?, eta'(958) meson bound states and their formations, 2012年02月, 英語, 国際会議
- 永廣秀子, Composite and elementary natures of hadrons -- Study of mixing properties of a1(1260) --, Composite and elementary natures of hadrons -- Study of mixing properties of a1(1260) --, 2011年06月, 英語, 国際会議
共同研究・競争的資金等の研究課題
- 基盤研究(C), 2021年, 2023年, 21K03536, 研究代表者, 中間子原子核に反映される有限密度における対称性の効果
- 基盤研究(C), 2017年04月01日, 2020年03月31日, 17K05443, ハドロンの有限密度効果とQCDの対称性, 永廣 秀子, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 奈良女子大学, 3250000, 2500000, 750000, 当該年度においては、η'中間子と原子核の系について、強く影響を及ぼすことが考えられるη中間子と核子の相互作用についての数値計算を行った。具体的には、4He に束縛されると考えられるη中間子について、WASA-at-COSYの実験研究者と共同研究を行い、ηと原子核間に働く相互作用の大きさに制限が付けられるか検証を行った。COSYの実験データとの詳細な比較の結果、相互作用の上限を決定することが出来た。その成果は、Physics Letters B 782 (2018)6-12 に掲載された。これらの結果は、η'中間子と原子核の系において、η'中間子とη中間子との混合によりη'中間子にも反映されるべき結果である。 また、理論計算として、これまで行ってきた η'中間子を含む結合チャネルの計算を推し進め、含めるべき相互作用や、チャネル等の再検討を行った。またそれを用いて、現在、現在存在する実験データとの比較を行い、理論計算のパラメータを決定した。今後これらを用いてこれまでに提示されている実験データを再現することが出来る理論模型を完成させ、η'中間子についての予想される実験データの提示を行っていく。 さらに、SPring-8 にて行われている η'中間子原子核の生成実験について、実験研究者と密に議論を行った。これは当報告者が過去に提唱した実験に直に対応するものであり、理論研究者として、個別の実験条件を詳細に考慮した理論計算の提示を行った。研究成果の発表は現在準備中である。, kaken
- 基盤研究(C), 2014年04月01日, 2017年03月31日, 26400275, 中間子原子核束縛系で探るカイラル対称性と量子異常効果, 永廣 秀子, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 奈良女子大学, 3640000, 2800000, 840000, 本研究は，eta'(958)中間子の有限密度中における質量減少の実験的な実現に向けた理論研究を行ったものである。eta'(958)の中間子の質量はUA(1)量子異常の存在とカイラル対称性の自発的破れの効果があいまって決定されると考えられている。従って，有限密度中でカイラル対称性の自発的破れが部分的に回復すれば，eta'(958)の質量が軽くなると予想される。本研究期間中に，ドイツ重イオン研究所において検証実験が行われ，生成断面積及び質量減少の上限値が決定された。, url;kaken
- 基盤研究(C), 2012年04月01日, 2016年03月31日, 24540274, 中間子―原子核系で探る核媒質中での対称性の様相, 比連崎 悟; 慈道 大介; 永廣 秀子, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 奈良女子大学, 5070000, 3900000, 1170000, 本研究の目的は、中間子-原子核系の研究から有限密度での種々の中間子の性質を知ることによって、量子色力学の対称性の様相の研究を進めることである。対称性の破れと回復の様相を知るためには、様々な現象や中間子の性質の間の関係を知る必要がある。重イオン衝突による研究と相補的で特色ある研究であると言える。 本計画の主な研究成果としては、有限密度におけるeta(958)中間子の性質に基づくeta(958)--原子核束縛系の構造及び生成反応、深く束縛されたパイ中間子原子の精密分光、核内ベクトル中間子の性質と実験観測量、それぞれに関する研究の発展があげられる。, url;kaken
- 新学術領域研究(研究領域提案型), 2012年04月01日, 2014年03月31日, 24105707, ｅｔａ’原子核にみる有限密度でのカイラル対称性回復とＵＡ（１）量子異常効果の検証, 永廣 秀子, 日本学術振興会, 科学研究費助成事業 新学術領域研究(研究領域提案型), 奈良女子大学, 3510000, 2700000, 810000, 本研究は、擬スカラー中間子の一つであるeta-prime(958)中間子に注目し、その有限密度中での質量減少の実験的な検証に向けた理論研究である。eta-prime(958)中間子は、南部-Goldstone粒子としては、重すぎる質量を持っており、これはUA(1)量子異常の存在とカイラル対称性の自発的破れがあいまって決定されていると考えられている。このことを踏まえ、有限密度中でのeta-prime(958)中間子の質量減少を観測することが出来れば、有限密度中でのカイラル対称性の自発的破れ及びUA(1)量子異常の振る舞いなどに関する知見が得られると考え、その実験的検証を目指すものである。 本研究では、eta-prime(958)中間子を原子核の束縛させ、そのスペクトラムをピークとして観測することで、eta-prime(958)中間子の質量減少の観測をめざしたものである。本年度は具体的に、原子核に陽子を入射させ、重陽子を観測する(p,d)反応による束縛状態生成に関し、最適な入射エネルギー、標的原子核などの具体的検証を行い、論文発表を行った。また、光子を入射させ陽子を観測する(gamma,p)反応に関しても、最適な実験条件を探るための理論研究を行い、実験研究者と議論を行った。さらに、微視的な相互作用から結合チャネル法を用いたeta-prime原子核光学ポテンシャルを導出し、エネルギー依存性を考慮した形で検証を行い、束縛エネルギー及び崩壊幅の見積もりを行った。さらにこの結合チャネルにおけるベクトル中間子の寄与に関して詳細に議論を行った。, kaken
- 新学術領域研究(研究領域提案型), 2010年, 2011年, 22105510, 有限密度でのUA(1)量子異常とカイラル対称性回復の検証に関する理論研究, 永廣 秀子, 日本学術振興会, 科学研究費助成事業 新学術領域研究(研究領域提案型), 奈良女子大学, 2990000, 2300000, 690000, 本研究は、対称性を手がかりとしてハドロンの多彩なエネルギースペクトルを理解することを最終的な目的とした研究である。その一環として具体的には、有限媒質中でのUA(1)量子異常の振る舞いおよびカイラル対称性の部分的回復の徴候を観測することを目的として、原子核中でのeta-prime(958)中間子の質量減少を実験的に観測することを目指した理論研究を行った。eta-prime(958)中間子は、他の南部ゴールドストーン粒子に比べて遙かに重い質量を持っており、これはUA(1)量子異常項の存在により説明されると考えられている。重要なことは、その同じ理論体系がカイラル対称性の回復に伴う同粒子の質量減少を予言していることである。しかし、その実験的検証は現在の所皆無であり、この質量減少を実際に実験的に観測することは、カイラル対称性の部分的回復やハドロンの質量生成機構の解明につながる重要なファクターである。 本研究では、eta-prime(958)中間子原子核生成について、(pi,N)反応及び、(p,d)反応を用いた束縛状態の生成可能性を議論し、そのどちらでも束縛状態を生成し、観測可能であることを示した。更に、通常中間子原子核束縛状態は幅が広く、このことが束縛状態をピークとして観測する事を困難にしているが、本研究において、ハドロン有効理論を元に吸収幅の評価を行い、その幅は束縛状態がピークとして観測可能である程度に十分小さいことも示した。これらの理論計算に基づき、実験研究者と共に実験の実施可能性を議論し、共同でドイツ重イオン研究所にeta-prime(958)中間子原子核生成実験の提案を行った。, kaken
- 特別研究員奨励費, 2006年, 2008年, 06J08661, 原子核媒質中におけるハドロンの性質とカイラル対称性の回復, 永廣 秀子, 日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 3400000, 3400000, 本研究は、カイラル対称性の観点から、中間子や中間子と原子核が構成する系の構造・性質を明らかにすることを目指し、QCDで非常に重要な役割を果たすと思われるカイラル対称性とその破れの機構について明らかにすることを目的とした。本年度は、特にエキゾチックハドロンと呼ばれる共鳴状態に注目した。近年、従来考えられていたような単純な3quarkもしくは、quark-反quark対の描像では説明できない共鳴状態がいくつか実験的に発見されてきた。そのようなエキゾチックな状態は、4quark以上のマルチクォーク状態や、複数のよりエネルギーの低いハドロンの分子状態として記述されるのではないかと考えられている。本研究では、軸性ベクトル中間子に注目した。この中間子がカイラル対称性を持つ有効模型を用いてベクトル中間子と擬スカラー中間子の束縛状態として記述されるという立場に立ち、その光崩壊幅の評価を行うことで、こゐ軸性べクトル中間子がどのような状態であるべきなのか、その実験的な検証の可能性を探った。 また、カイラル対称性の回復と関係すると考えられているω中間子の質量変化を観測することを目的として、π中間子入射ビームを用いたω中間子原子核束縛系の生成可能性について評価を行い、それが現実の実験で観測可能であることを示した。具体的に実験研究者との議論を行い、当該実験の実現可能性についても議論を行った。, kaken
- 基盤研究(C), 2004年, 2006年, 16540252, ペンタクォークバリオンの構造と生成に関する理論研究, 保坂 淳; 土岐 博; 中野 貴志; 永廣 秀子, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 大阪大学, 3200000, 3200000, 本研究ではペンタクォーク粒子【○!-】^+の構造と生成崩壊反応に関する研究を行った。構造の研究としては、構成クォーク模型を採用し、5クォーク状態の構造を直感的に理解できる方法を提案した。そしてカイラルクォーク模型で得られていた結果を直感的に理解するとともに、クォークの波動関数によって、質量と崩壊幅がどのように現れるか詳しく解析した.特に、5体系の問題を散乱状態まで含めて正しく考察した。 一方実験で行われる生成反応からペンタクォークの性質を引き出すために、反応機構を調べた。我々は一貫して、有効ラグランジアンの方法を採用し、中間子とバリオンの結合パラメータは対称性から決めることで、パラメータにできるだけ依存しない方法に基づいた研究を行った。そして【○!-】^+のスピンとパリティーは未知量としてそれぞれの場合に期待される生成率、断面積の角度分布などを予言した。特に、pp反応で同種粒子の性質を用いて閾値近傍の生成率から【○!-】^+のパリティーを特定する方法を提案した。 さらにペンタクォークの物理に密接に関係した研究テーマとして、反対のストレンジネス量子数(S=-1)をもったハイペロンの励起状態、Λ(1405)およびΛ(1520)の研究を行った。前者はと強く結合することから以前から真性ではないものの5クォーク粒子の候補として、その性質を調べた。, kaken
- イータ(958)中間子原子核生成と有限密度中におけるUA(1)量子異常, 0, 0, 0, 競争的資金
- イータ中間子原子核生成と有限密度中におけるカイラル対称性回復, 0, 0, 0, 競争的資金
- ハドロン共鳴にみるエキゾチック構造, 0, 0, 0, 競争的資金
- eta'(958)mesic nuclei formation and UA(1) anomaly in medium, 0, 0, 0, 競争的資金
- eta mesic nuclei and partial restoration of chiral symmetry, 0, 0, 0, 競争的資金
- composite and elementary component of hadronic resonance, 0, 0, 0, 競争的資金
- 基盤研究(C), 2021年04月01日, 2024年03月31日, 21K03536, 中間子原子核に反映される有限密度における対称性の効果, 永廣 秀子, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 奈良女子大学, 2990000, 2300000, 690000, 本研究は、量子色力学が持つ対称性を手がかりとして、ハドロンの性質を統一的に理解することを最終的な目的として、その一環として、eta'(958)中間子の有限媒質中での性質変化の解明を目指すものである。そのために、eta'(958)中間子と原子核の束縛状態を生成する可能性を理論的に議論している。 特に、ηおよびη'(958)中間子と原子核の束縛状態を生成し、核中でのハドロンの性質変化を分光スペクトルにおけるピーク構造から探ることを目的としている。これらの中間子は同じ量子数を持ち、互いに混合する粒子であるが、カイラル対称性の部分的回復に対する応答メカニズムが異なっていると考えられる。本研究はこれらの束縛系を包括的に議論することにより、有限媒質中におけるカイラル対称性回復のシグナルがどのように得られるのかを解明することを目指す。 現在、eta'中間子と核子との相互作用を明らかにするため、eta'中間子と同じ量子数を持つ軽い擬スカラー中間子(π中間子、η中間子、K中間子)とバリオン(N, Λ, Σ)の結合チャネルを理論的に取り入れている。現在、これに、ベクトル中間子を加味し、eta'中間子生成の閾値近傍におけるeta'N散乱の実験データの記述を試みている。これは実施計画に記述した理論体系の強化に対応する。 研究の進行は順調であり、2022年度にはこれらの理論模型を用いて、eta'と原子核の系を記述する予定である。, kaken