永廣 秀子 (ナガヒロ ヒデコ)

Nonmesonic decay of the $η$mesic $^3He$ via $pd→(^3He$$η)_bound→$ $^3He 2γ (6γ$) reaction
2019年08月, Nuclear Physics A, 993, 121647研究論文（学術雑誌）
$η$nucleus interaction from the $d+d$ reaction around the $η$ production threshold
The eta mesic nucleus is considered to be one of the interesting exotic manybody 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 WASAatCOSY. 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 etanucleus interactions. We compare our results with existing data of the d+ d > eta + alpha and the d+ d > He3 + N + pi reactions. We find that the analyses by our theoretical model with the existing data can provide new information on the etanucleus interaction., 2017年, Eur. Phys. J. A, 53 (10), 194  194, doi;web_of_science研究論文（学術雑誌）
Decays of doubly charmed meson molecules
If the X(3872), Y(3940) and X(4160) are D*(D) over bar + c.c., D*(D) over bar (S) and DS*(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, AIP Conf. Proc., 1701 (1), 050011  050011, doi;web_of_science研究論文（学術雑誌）
Precision spectroscopy of pionic atoms and chiral symmetry in nuclei
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, EPJ Web Conf., 130, 01017  01017, doi;web_of_science研究論文（学術雑誌）
Search for η ′ mesic nuclei by missingmass spectroscopy of the ^{12}C(p, d) reaction
We performed a missingmass spectroscopy experiment of the 12C(p, d) reaction at 2.5 GeV proton energy in order to search for η′ mesic nuclei. An excitationenergy 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, EPJ Web of Conferences, 130, 02010  02010, doi;url;url研究論文（学術雑誌）
Decays of doubly charmed meson molecules
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* Ds* thresholds, and have spinparity J(P) = 1(+). We evaluate the decay widths of these states, named as Rcc(3970) and Scc(4100) (with strangeness), and obtain 44 MeV for the nonstrangeness, and 24 MeV for the doubly charmstrange 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, Chiral Symmetry in Hadrons and Nuclei, 124  127, web_of_science研究論文（国際会議プロシーディングス）
Formation spectra of pionic atoms in the Green's function method
We study the formation spectra of deeply bound pionic atoms in the (d, He3) 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 bindingenergy 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, PTEP, 2015 (3), 033D01, doi;web_of_science研究論文（学術雑誌）
Formation of Deeply Bound Pionic Atoms and Pion Properties in Nuclei
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 eveneven and neutronodd nucleus targets. We also show the angular dependence of the formation spectra in the (d, He3) 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, Acta Phys. Polon. A, 127 (5), 1568  1570, doi;web_of_science研究論文（学術雑誌）
Spectroscopy of $η'$nucleus bound states at GSI and FAIR — very preliminary results and future prospects —
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, Hyperfine Interact., 234 (13), 33  39, doi;web_of_science研究論文（学術雑誌）
Meson properties from mesic atoms and mesic nuclei
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,He3) reactions., 2014年, EPJ Web Conf., 81, 01026  01026, doi;web_of_science研究論文（学術雑誌）
Experimental constraints on the \ensuremathω –nucleus real potential
In a search for omega mesic states, the production of omegamesons in coincidence with forward going protons has been studied in photon induced reactions on C12 for incident photon energies of 12503100 MeV. The pi(0)gamma pairs from decays of bound or quasifree omegamesons 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 B11 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 inmedium width of the omegameson. A comparison of the measured total energy distribution with calculations suggests the real part V0 of the omega B11 potential to be small and only weakly attractive with V0(rho = rho(0)) = 15 +/ 35(stat) +/ 20(syst) MeV in contrast to some theoretical predictions of attractive potentials with a depth of 100150 MeV. (C) 2014 The Authors. Published by Elsevier B.V., 2014年, Phys. Lett. B, 736, 26  32, doi;web_of_science研究論文（学術雑誌）
Elementarity of composite systems
The "compositeness" or "elementarity" is investigated for swave composite states dynamically generated by energydependent 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 zeroenergy 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, Phys. Rev. C, 90 (6), 065201  065201, doi;web_of_science研究論文（学術雑誌）
Meson Properties at Finite Density from Mesic Atoms and Mesic Nuclei
The properties of eta'(958) meson at finite nuclear density is considered to have close connection with the effects of UA(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 etamesic 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 etamesic nuclei., 2014年, Acta Phys. Polon. B, 45 (3), 619  619, doi;web_of_science研究論文（学術雑誌）
Missing Mass Spectroscopy of $η'$ Mesic Nuclei with the $(p,d)$ Reaction at GSI
We plan a missingmass spectroscopy experiment of eta' mesic nuclei with the C12(p,d)eta'circle times C11 reaction to study inmedium 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 SuperFRS at FAIR. The plan of the experiment and development of a Cherenkov detector and an optics mode are described., 2014年, EPJ Web Conf., 66, 09019  09019, doi;web_of_science研究論文（学術雑誌）
Spectroscopy of etaprime Mesic Nuclei via SemiExclusive Measurement at FAIR
In order to investigate a possible mass reduction of an eta' meson at finite density, a series of missingmass spectroscopy experiments of rlnucleus bound states with the C12(p,d) reaction is planned at GSI and FAIR. A semiexclusive measurement with the tagging of protons from eta' twobody absorption (eta'NN > NN) will be a key feature in an experiment with SuperFRS at FAIR., 2014年, EPJ Web Conf., 66, 09006  09006, doi;web_of_science研究論文（学術雑誌）
Formation of η'(958)mesic nuclei by the (p,d) reaction
We calculate theoretically the formation spectra of η'(958)nucleus systems in the (p,d) reaction for the investigation of inmedium 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, Physical Review C  Nuclear Physics, 87 (4), doi研究論文（学術雑誌）
Resonances generated by the vector mesonbaryon dynamics
We have recently studied vector mesonoctet baryon (VB) interactions with the aim to find dynamical generation of resonances in such systems. For this, we consider the s, t, uchannel diagrams along with a contact interaction originating from the hidden local symmetry Lagrangian. We find the contribution from all these sources, except the schannel, to be important. The amplitudes obtained by solving the coupled channel BetheSalpeter 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 mesonbaryon (PB) channels. We find that the lowlying 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 1,8002,200 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 PBVB coupled channel dynamics for example, we find that a Σ resonance near 1,400 MeV gets developed due to such an effect. © 2012 SpringerVerlag., 2013年, Few Body Syst., 54 (14), 343  346, doi研究論文（学術雑誌）
Composite and elementary components in hadron resonances
In hadron resonances different structures of hadronic composite (molecule) and elementary (quarkintrinsic) 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) mesonnucleons 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 SpringerVerlag., 2013年, Few Body Syst., 54 (14), 19  24, doi;url;url研究論文（学術雑誌）
Formation of $η^\prime(958)$mesic nuclei by ($p,d$) reaction
We calculate theoretically the formation spectra of. n' (958)nucleus systems in the (p,d) reaction for the investigation of inmedium 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 C11, 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, Phys. Rev. C, 87 (4), 045201  045201, doi;web_of_science研究論文（学術雑誌）
Composite and elementary nature of a resonance in the \ensuremathσ model
We analyze the mixing nature of the lowlying 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 twolevel 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 cutoff value and the mass of the elementary sigma meson., 2013年, Phys. Rev. C, 88 (5), 055203  055203, doi;web_of_science研究論文（学術雑誌）
(d,3He) reaction on oddneutron nuclear target for the formation of deeply bound pionic atoms
We consider pionic atom spectroscopy by the (d,He3) reaction on an oddneutron nuclear target in this article, which has not yet been investigated. In the (d,He3) reaction on the oddneutron nuclear target, we can observe pionic states in the evenneutron nucleus with spinparity 0(+). We expect that these pionic states do not have additional shifts due to the effects of the residual interaction between neutronhole and pionic states. For the evenneutron 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 highprecision experimental data, since the final pionic states are pionparticle plus neutronhole [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,He3) reaction on an oddneutron 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 eveneven nuclear target case to study pionic atom formation spectra on the evenodd nuclear target and show the numerical results of the Sn117 target case. This experiment will be performed at RIBF/RIKEN in the near future., 2013年, PTEP, 2013 (6), 063D01, 115, doi;web_of_science研究論文（学術雑誌）
Complex 2D matrix model and geometrical map on the complex$N_c$ plane
We study the parameter dependence of the internal structure of resonance states by formulating a complex twodimensional (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 complexparameter 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 quarkantiquark pair and a mesonic molecule as exotics from the geometry on the complexNc plane. For largeNc effective theory, we employ the chiral Lagrangian induced by holographic QCD with a D4/D8/D8 multiD brane system in type IIA superstring theory. © The Author(s) 2013., 2013年, PTEP, 2013 (8), 083D01, 113, doi研究論文（学術雑誌）
Formation of the $η^\prime$(958)mesic nuclei in missing mass spectroscopies
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, Nucl. Phys. A, 914, 360  364, doi;web_of_science研究論文（学術雑誌）
$η^\prime$ meson under partial restoration of chiral symmetry in nuclear medium
Inmedium modification of the eta' mass is discussed in the context of partial restoration of chiral symmetry in nuclear medium. We emphasize that the UA (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 twobody 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, Nucl. Phys. A, 914, 354  359, doi;web_of_science研究論文（学術雑誌）
Nuclear density probed by antikaonnucleus systems and antikaonnucleus interaction
Effective nuclear densities probed by antikaonnucleus 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 antikaon 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, Nucl. Phys. A, 914, 344  348, doi;web_of_science研究論文（学術雑誌）
Formation of $η'(958)$ Meson Bound States and Chiral Symmetry InMedium
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, Few Body Syst., 54 (710), 1565  1568, doi;web_of_science研究論文（学術雑誌）
Formation of Deeply Bound Pionic Atoms in Sn Isotopes
We study the formation of deeply bound pionic atoms in the (d,He3) 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 Sn117(d, He3) spectra. We conclude that the observation of the (d,He3) 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, Few Body Syst., 54 (710), 1573  1576, doi;web_of_science研究論文（学術雑誌）
Spectroscopy of $η'$ mesic nuclei with $(p,d)$ reaction
We are going to perform an inclusive spectroscopy experiment of eta' mesic nuclei with the C12(p,d) reaction to study inmedium 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 C11 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, Few Body Syst., 54 (710), 1263  1266, doi;web_of_science研究論文（学術雑誌）
Dynamically Generated Resonances from Two Vectors in the Charm Sector and their Decays
In this talk we study dynamically generated resonances from twovector 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 Tmatrix 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 'flavorexotic' 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, Few Body Syst., 54 (710), 1259  1262, doi;web_of_science研究論文（学術雑誌）
Formation of deeply bound pionic atoms in Sn isotopes
We study the formation of deeply bound pionic atoms in the (d,He3) reactions theoretically and show the energy spectra of the emitted He3 at finite angles. We find that the different combinations of the pionbound and neutronhole 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,He3) 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, EPJ Web Conf., 37, 09018  09018, doi;web_of_science研究論文（学術雑誌）
eta' meson under partial restoration of chiral symmetry in nuclear medium
We shed light upon the eta ' mass in nuclear matter in the context of partial restoration of chiral symmetry, pointing out that the UA ( 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, EPJ Web Conf., 37, 09019  09019, arxiv;doi;web_of_science;url;url研究論文（学術雑誌）
Formation of etaprime(958) mesic nuclei
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, EPJ Web Conf., 37, 02001  02001, doi;url;url研究論文（学術雑誌）
Hadron resonances with coexistence of different natures
We discuss coexistence/mixing of different natures of hadronic composite (molecule) and elementary (quarkintrinsic) ones in hadron resonances. The discussions here are based on our previous publications on the origin of hadron resonances [1], exotic $\\bar{D}$ mesonnucleons as hadronic composites containing one antiheavy 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, EPJ Web Conf., 20, 01005  01005, arxiv;doi;url;url研究論文（学術雑誌）
Spectroscopy of η′ nucleus bound states at GSISIS
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 missingmass spectroscopy experiment with the 12C(p,d) reaction at GSISIS. 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, EPJ Web of Conferences, 37, 02005  02005, doi;url;url研究論文（学術雑誌）
Feasibility Study of Observing eta' Mesic Nuclei with (p,d) Reaction
A novel method is proposed to measure eta' (958) meson bound states in C11 nuclei by missing mass spectroscopy of the C12(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 inmedium 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, Prog. Theor. Phys., 128 (3), 601  613, web_of_science;doi研究論文（学術雑誌）
Nuclear bound state of eta'(958) and partial restoration of chiral symmetry in the eta' mass
The inmedium 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, Phys. Rev. C, 85 (3), 032201  032201, doi;web_of_science研究論文（学術雑誌）
etaprime nucleus optical potential and possible etaprime bound states
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 secondorder 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, Phys. Lett. B, 709 (12), 87  92, doi;web_of_science研究論文（学術雑誌）
Vector and Pseudoscalarbaryon coupled channel systems
In this manuscript, I will report the details of our recent work on the vector mesonbaryon (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 tchannel (b) an octet baryon exchange in the s, uchannels and (c) a contact interaction arising from the part of the vector mesonbaryon Lagrangian which is related to the anomalous magnetic moment of the baryons. We find the contribution from all these sources, except the schannel, to be important. The amplitudes obtained by solving the coupled channel BetheSalpeter 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) S31, N* (2080) D13, N* (1700) D13, and N* (2090) S11, respectively. We have further extended our study by including pseudoscalar mesonbaryon (PB) as the coupled channels of VB systems. For this, we obtain the PB > VB amplitudes by using the KrollRuddermann 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 lowlying 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, J. Phys. Conf. Ser., 374, 012007  012007, doi;web_of_science研究論文（学術雑誌）
Pionic atom spectroscopy in the (d,3 He) reaction at finite angles
We study the formation of deeply bound pionic atoms in the (d, He3) reactions theoretically and show the energy spectra of the emitted He3 at finite angles, which are expected to be observed experimentally. We find that the different combinations of the pionbound and neutronhole states dominate the spectra at different scattering angles because of the matching condition of the reaction. We conclude that the observation of the (d, He3) 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, The European Physical Journal A, 47 (12), 161  161, doi;web_of_science;url;url;url研究論文（学術雑誌）
Vector mesonbaryon interaction to study dynamical generation of resonances
With the motivation to find dynamical generation of resonances, we study vectormeson baryon interaction by taking s, t, uchannel 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 nonzero spin particles which possess similar masses and find spin dependent interaction similar to the nucleonnucleon case., 2011年, AIP Conf. Proc., 1388 (1), 310  313, doi;web_of_science研究論文（学術雑誌）
A study of mixing properties of a1(1260) meson
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 Nc procedure and its limitation for the classification of such a mixed state., 2011年, AIP Conf. Proc., 1388 (1), 302  305, doi;web_of_science;url;url研究論文（学術雑誌）
Decay of vectorvector resonances into $γ$ and a pseudoscalar meson
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, Phys. Rev. D, 83 (9), 094030  094030, doi;web_of_science研究論文（学術雑誌）
Composite and elementary natures of $a_1(1260)$ meson
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 Nc procedure and its limitation for the classification of such a mixed state., 2011年, Phys. Rev. D, 83 (11), 111504  111504, doi;web_of_science研究論文（学術雑誌）
Precision Spectroscopy of Deeply Bound Pionic Atoms and Partial Restoration of Chiral Symmetry in Medium
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 nonyrast pionic states such as 2s are expected to be seen in the (d,He3) 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, Prog. Theor. Phys., 126 (3), 483  509, doi;web_of_science研究論文（学術雑誌）
Formation of Heavy Meson Bound States by Two Nucleon Pickup Reactions
We develop a model to evaluate the formation rate of the heavy mesic nuclei in twonucleon pickup reactions and apply it to the (6)Li target cases for the formation of heavy mesonalpha 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 twonucleon pickup reactions. We find the formation rate of the mesonalpha bound states can be around half of the elementary cross sections at the recoilless kinematics with small distortions., 2011年, Phys. Rev. C, 84 (5), 054609  054609, doi;web_of_science研究論文（学術雑誌）
A theoretical model for formation of eta He4 bound state by d + d reaction
In this article, we consider theoretically the d+d reaction for the formation of the etaHe4 bound state. We evaluate the formation rate and show expected spectra using a simple theoretical model with Green's function method., 2011年, Int. J. Mod. Phys. A, 26 (34), 444  449, doi;web_of_science研究論文（学術雑誌）
Formation of ηmesic nuclei by (π, N) reaction at JPARC
We study the formations of of the ηnucleus 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 ηnucleus interaction. Based on the N*(1535) dominance in the ηN system, the ηmesic nuclei are suitable systems for the study of inmedium 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 inmedium N* and ηnucleus interactions can be obtained through the formation spectra of the ηmesic nuclei., 2010年01月01日, Hadron and Nuclear Physics 09: Osaka University, Japan, 1619 November 2009, 141  149, doi論文集(書籍)内論文
Regge approach in charged k* photoproduction
We investigate ϒp → K*+A reaction within a Regge approach. For the gauge invariance of the scattering amplitude, we reggeize the schannel and contact term amplitudes as well as the tchannel 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, Hadron and Nuclear Physics 09: Osaka University, Japan, 1619 November 2009, 188  192, doi論文集(書籍)内論文
Meson properties in nuclear medium
We discuss the interests and difficulties of the studies of the mesonnucleus 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, Hadron and Nuclear Physics 09: Osaka University, Japan, 1619 November 2009, 134  140, doi論文集(書籍)内論文
Deeply bound pionic states in Sn at RIKEN RI beam factory
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, Hadron and Nuclear Physics 09: Osaka University, Japan, 1619 November 2009, 206  210, doi;url;url論文集(書籍)内論文
Charged K* Photoproduction in a Regge model
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 contactterm amplitudes as well as the tchannel 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, Phys. Rev. C, 81 (3), 035206  035206, doi;web_of_science研究論文（学術雑誌）
Theoretical study of formation rates of eta, eta' and omegamesic nuclei induced by the pion beam
We present the theoretical study on formation rates of the eta, eta' and omegamesonnucleus systems induced by the (pi, N) reactions on nuclear targets. For the etamesic nuclei, we can study the inmedium properties of the N*(1535) baryon resonance. As for the eta'(958) mesonnucleus system, the inmedium U(A) (1) anomaly effect might be observed. We can also know the inmedium 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, Prog. Theor. Phys. Suppl., 186 (186), 316  324, doi;web_of_science研究論文（学術雑誌）
Phi photoproduction in a coupledchannel approach
We investigate photoproduction of phimesons off protons within a coupledchannel effectiveLagrangian method which is based on the Kmatrix 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 coupledchannel 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 phiphotoproduction., 2010年, Nucl. Phys. A, 835 (14), 321  324, doi;web_of_science研究論文（学術雑誌）
Scalar, AxialVector and Tensor Resonances from the $ρ D^*$, $ω D^*$ Interaction in the Hidden Gauge Formalism
We apply a unitary approach together with a set of hiddengauge Lagrangians to study the vectorvector 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, AIP Conf. Proc., 1257 (1), 447  451, web_of_science;doi研究論文（学術雑誌）
Formation of \eta Mesic Nuclei
In this paper, we briefly introduce the interests and the recent research activities on the etamesic nuclei. We also mention the activities on the eta'(958)mesic nucleus formation., 2010年, Acta Phys. Polon. B, 41 (10), 2211  2220, web_of_science研究論文（学術雑誌）
Reaction dynamics for photoproductions of baryon resonances
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, Chin. Phys. C, 33 (12), 1167  1174, doi;url;url研究論文（学術雑誌）
Formation of etamesic nuclei by (pi, N) reaction and chiral symmetry for baryons
We calculate formation spectra of etanucleus systems in (pi, N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including JPARC, in order to investigate etanucleus interactions. Based on the N*(1535) dominance in the eta N system, etamesic nuclei are suitable systems for study of inmedium 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 inmedium N* and etanucleus interactions can be obtained through the formation spectra of the etamesic nuclei., 2009年, Int. J. Mod. Phys. E, 18 (10), 2202  2206, doi;web_of_science研究論文（学術雑誌）
Special Issue: Proceedings for the International Workshop on Chiral Symmetry in Hadron and Nuclear Physics (CHIRAL07) PREFACE
2008年09月, MODERN PHYSICS LETTERS A, 23 (2730), V  VII, web_of_sciencePhoto and ElectronProduction of Mesons on Nucleons and Nuclei
In these lectures I will show some results obtained with the chiral unitary approach applied to the photo and electroproduction of mesons. The results for the photoproduction of eta pi(0)p and K0 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 photoproduction 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, Prog. Part. Nucl. Phys., 61 (1), 260  275, doi;web_of_science研究論文（学術雑誌）
Modern Physics Letters A: Preface
2008年, Modern Physics Letters A, 23 (2730), vviiStructure and formation of kaonic atoms and kaonic nuclei
We study theoretically the inflight (K, N) reactions for the formation of (K) over bar NN systems using the microscopic chiral unitary swave (K) over barN amplitude to get deeper physical insights on the expected spectra, and to investigate the experimental feasibility of the reaction at JPARC 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, Mod. Phys. Lett. A, 23 (2730), 2528  2531, web_of_science;doi研究論文（学術雑誌）
Study of inmedium properties of N*(1535) and chiral symmetry for baryons through the etamesic nuclei formation at JPARC
We investigate the properties of etanucleus interaction by postulating the N*(1535) dominance for etaN 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 etanucleus 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 JPARC project., 2008年, Mod. Phys. Lett. A, 23 (2730), 2512  2515, doi;web_of_science研究論文（学術雑誌）
The role of the QCD anomaly in kaon photoproduction
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 tchannel, which can be tested by the photon asymmetry in comparison with experimental data. We find a significant amount of contribution from the oneloop diagram induced by the gauged WessZuminoWitten 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, Mod. Phys. Lett. A, 23 (2730), 2325  2328, doi;web_of_science研究論文（学術雑誌）
Magnetic interaction induced by the anomaly in kaonphotoproductions
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 WessZuminoWitten 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, Phys. Lett. B, 665 (4), 178  181, doi;web_of_science研究論文（学術雑誌）
Formation of deeply bound kaonic atoms in (K,N) reactions
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, Physical Review C  Nuclear Physics, 76 (4), doi研究論文（学術雑誌）
Photoproduction of omega and omega in the nuclear medium
2007年10月研究論文（学術雑誌）
Exotic mesic atoms for a class of strongly correlated fermi systems
2007年, CONDENSED MATTER THEORIES, VOL 21, 21, 351  +, web_of_science研究論文（国際会議プロシーディングス）
Formation of Deeply Bound Kaonic Atoms in (K,N) Reactions
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, Phys. Rev. C, 76 (4), 045204  045204, doi;web_of_science研究論文（学術雑誌）
Study of possible omega bound states in nuclei with the (gamma,p) reaction
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, Phys. Rev. C, 75 (6), 064616  064616, doi;web_of_science研究論文（学術雑誌）
eta and eta 'mesic nuclei and UA(1) anomaly at finite density
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 SPring8. 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 UA(1) anomaly in the nuclear medium., 2006年10月, PHYSICAL REVIEW C, 74 (4), 045203, doi;web_of_science研究論文（学術雑誌）
eta and etaprimemesic nuclei and U(A)(1) anomaly at finite density
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 SPring8. 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, Phys. Rev. C, 74 (4), 045203  045203, doi研究論文（学術雑誌）
Inflight (K,p) reactions for the formation of kaonic atoms and kaonic nuclei using the Green function method
We study theoretically the kaonic atom and kaonic nucleus formations in the inflight (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 kaonnucleus optical potential. In the spectra with the phenomenological deep kaonnucleus 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, Physical Review C  Nuclear Physics, 74 (1), doi研究論文（学術雑誌）
etaprime(958)mesic nuclei formation and U(1)A anomaly at finite density
We discuss the possibility of producing the bound states of the eta'(958) meson in nuclei theoretically using the the NambuJonaLasinio (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 SPring8. 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 UA (1) anomaly at finite density., 2006年, AIP Conf. Proc., 842 (1), 228  230, web_of_science;doi研究論文（学術雑誌）
Inflight (K,p) reactions for the formation of kaonic atoms and kaonic nuclei in green function method
We study theoretically the kaonic atom and kaonic nucleus formations in the inflight (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 kaonnucleus optical potential. In the spectra with the phenomenological deep kaonnucleus 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, Phys. Rev. C, 74 (1), 014604  014604, doi;web_of_science研究論文（学術雑誌）
Formation of kaonic atoms and kaonic nuclei in inflight (K, p) reactions (vol 114, pg 301, 2005)
2005年10月, PROGRESS OF THEORETICAL PHYSICS, 114 (4), 905  905, web_of_scienceResidual interaction effects on deeply bound pionic states in Sn and Pb isotopes
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 pwave pi N interactions are used for the pionnucleon residual interactions. We show that the complex energy shifts are around [(1020) + i(27)] 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, PHYSICAL REVIEW C, 71 (6), doi;web_of_science研究論文（学術雑誌）
Production of circle dot(+) hypernuclei with the (K+,pi(+)) reaction
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, Pentaquark 04, Proceedings, 378  385, web_of_science研究論文（国際会議プロシーディングス）
Formation of kaonic atoms and kaonic nuclei by inflight (K,p) reactions
We theoretically study kaonic atom and kaonic nucleus formation in inflight (K,p) reactions for C, O, Si and Ca targets. Deeply bound kaonic atoms were previously predicted to exist as quasistable states, and it is expected that they can be observed using certain wellsuited 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, Prog. Theor. Phys., 114 (2), 301  316, doi;web_of_science研究論文（学術雑誌）
Residual interaction effects on deeply bound pionic states in Sn and Pb isotopes
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 pwave πN interactions are used for the pionnucleon residual interactions. We show that the complex energy shifts are around [(1020) + i(27)] 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, Phys. Rev. C, 71 (6), 061601  061601, doi研究論文（学術雑誌）
Inmedium properties of N*(1535) in chiral models and etanucleus interaction
We investigate the properties of ηnucleus interaction by postulating the N*(1535) dominance for ηN 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 ηnucleus 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, Nucl. Phys. A, 755 (14), 491  494, doi;url;url研究論文（学術雑誌）
Formation of etaprime(958)  mesic nuclei and axial U(A)(1) anomaly at finite density
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 SPring8. 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 UA(1) anomaly in the nuclear medium., 2005年, Phys. Rev. Lett., 94 (23), 232503  232503, doi;web_of_science研究論文（学術雑誌）
Formation of mesic nuclei by (gamma,p) reactions
We present a theoretical study on formation rates of eta and omega mesonnucleus 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 scalarisoscalar (sigma) mode in nucleus in order to investigate spectral enhancement around twopion threshold caused by partial restoration of chiral symmetry. We conclude that valuable information of mesonnucleus 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, Nucl. Phys. A, 761 (12), 92  119, doi;web_of_science研究論文（学術雑誌）
Production of Theta+ hypernuclei with the (K+, pi+) reaction
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, Phys. Lett. B, 620 (34), 125  130, doi;web_of_science研究論文（学術雑誌）
etamesic nuclei in chiral models
The properties of ηnucleus interaction and their experimental consequences are investigated with ηnucleus optical potentials obtained by postulating the N*(1535) dominance for ηN 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 inmedium 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, Prog. Theor. Phys. Suppl., 153, 340  343, doi;url;url研究論文（学術雑誌）
ηnucleus interactions and inmedium properties ofN*(1535)in chiral models
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 inmedium 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, Physical Review C, 68 (3), 9, doi;j_global;url;url研究論文（学術雑誌）
Medium effects to the N(1535) resonance and eta mesic nuclei
The structure of ηnucleus bound systems (η mesic nuclei) is investigated as one of the tools to study inmedium properties of the N(1535) (N*) resonance. We show that, as a general consequence, the ηnucleus 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 inmedium effects to N*. The (d,3He) spectra are evaluated for the formation of these bound states to investigate the experimental feasibility., 2003年, Nucl. Phys. A, 721, 665  668, arxiv;doi;url;url研究論文（学術雑誌）
Medium effects to the [Formula Presented] resonance and [Formula Presented] mesic nuclei
The structure of [Formula Presented]nucleus bound systems [Formula Presented] mesic nuclei) is investigated as one of the tools to study inmedium 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 inmedium 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 “centralrepulsive and surfaceattractive” optical potential and find that the level structure is sensitive to the inmedium 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 halolike [Formula Presented] states in [Formula Presented]unstable halo nuclei. © 2002 The American Physical Society., 2002年, Physical Review C  Nuclear Physics, 66 (4), 7, doi研究論文（学術雑誌）
Binding energy of scalar bound state by topologically massive interaction: fermion and antifermion system with heavy mass
A bound state problem in a topologically massive quantum electrodynamics is investigated by using a nonperturbative method. We formulate the BetheSalpeter equation for scalar bound states composed of massive fermion and antifermion 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 ChernSimons term gives the bound system a repulsive effect. (C) 2002 Elsevier Science B.V. All rights reserved., 2002年, Phys. Lett. B, 536 (12), 49  58, doi;web_of_science研究論文（学術雑誌）
Formation of sigma mesic nuclei in (d,t) and (d,He3) reactions
We explore the possibility to observe an enhanced 2π correlation in the scalarisoscalar (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, Nucl. Phys. A, 710 (12), 131  144, doi研究論文（学術雑誌）
Topological mass versus dynamical mass: Novelty in (2+1)dimensional spacetime
2000年, Grav. Cosmol., 6, 145  145研究論文（学術雑誌）
Formation of sigma mesic nuclei as a probe of chiral restoration in nuclear medium
2000年, Soryushiron Kenkyu, 102 (5), 185  190研究論文（学術雑誌）
EtaPrime Bound States in Nuclei and Partial Restoration of Chiral Symmetry
14th International Conference on Hadron Spectroscopy, arxiv;url;url(p,d)反応の分光によるη′中間子原子核の探索
2015年03月24日, 日本物理学会講演概要集(CDROM), 70 (1), ROMBUNNO.21PCC1, j_globalThe structure of baryons. Proceedings, 12th International Conference, Baryons'10,
2011年, AIP Conf. Proc., 1388Hadron and nuclear physics 09: Osaka University, Japan, 1619 November 2009
This volume collects papers presented at the international workshop "HadronNuclear Physics 09" held at Osaka, November 1619, 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 nonlinear 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., World Scientific Publishing Co., 2010年01月01日, Hadron and Nuclear Physics 09: Osaka University, Japan, 1619 November 2009, 1  407, doi;urlその他
Hadron and Nuclear Physics 09, Proceedings of International Workshop on Hadron and Nuclear Physics, "HNP09"
2010年, World ScientificChiral symmetry in hadron and nuclear physics. Proceedings, International Workshop, CHIRAL07, Osaka, Japan, November 1316, 2007.
2008年, Modern Physic Letters A, 23, 22012623Structure of charmed baryons studied by pionic decays
Structures and Interactions of Heavy Quark Hadrons, 2017年03月, trueEffect of the final state interaction of eta'N on the eta' photoproduction off nucleon
第72回日本物理学会年次大会, 2017年03月, falseStructure of charmed baryons studied by pionic decays
2016 JAEA/ASRC Reimei Workshop : New exotic hadron matter at JPARC, 2016年10月, Korea, true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
日本物理学会, 2016年09月, falseDecays of charmed baryons through pion emission in the quark model
The 10th APCTPBLTP/JINRRCNPRIKEN Joint Workshop on Nuclear and Hadron Physics, 2016年08月, RIKEN, trueDecays of charmed baryons through pion emission in the quark model
Seminar at IFIC, Valencia University, 2016年07月, trueFormation of possible eta'(958)nucleus bound states and eta'N interaction
The 14th Internatioanal Conference on MesonNucleon Physics and the Structure of the Nucleon (MENU2016), 2016年07月, trueDecays of charmed baryons through pion emission in the quark model
日本物理学会 第71回年次大会, 2016年03月, falseDecays of charmed baryons through pion emission in the quark modek
MiniWorkshop on hadron physics with a variety of flavors, 2016年02月, trueチャームバリオンの崩壊／Mesic nuclei by missing mass specroscopy
二国間交流事業共同研究／セミナー, 2016年02月, false結合チャネル計算によるeta'(958)核子相互作用
原子核媒質中のハドロン研究 III, 2015年10月, false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
日本物理学会 2015年秋季大会, 2015年09月, falseeta'(958)nucleon interaction and possible bound state of eta'N system
1st Hadron Spanish Network Days and SpanishJapanese JSPS Workshop, 2015年06月, trueHadron properties at finite density and specroscopies of mesic nuclei
Hadrons and Hadron Interaction in QCD2015 Effective Theory and Lattice , 2015年03月, trueElementarity of composite systems
Workshop on "Bound states in QCD and beyond", 2015年03月, St. Goar, Germany, trueStudy for the elementarity of composite systems
4th Joint Meeting of the Nuclear Physics Division of the American Physical Society and The Physical Soci ety of Japan, 2014年10月, American Physical Society and Japan Physical Society, trueFormation of eta'(958) mesic nuclei by (p,d) reaction
EXA2014, 2014年09月, trueDo elementary particle survive composite systems ?
The 8th APCTPBLTP JINR Joint Workshop, 2014年06月, trueComposite and elementary natures of hadron resonances
Hirschegg2014, International Workshop XLII on Gross Properties of Nuclei and Nuclear Excitations, 2014年01月, Hirschegg, Kleinwalsertal, Austria, trueeta'(958)nucleus bound states and their formations by missing mass spectroscopies
YITP workshop on "Hadrons in Nucleus", 2013年11月, Maskawa Hall, Kyoto University, trueeta'(958) mesic nuclei by (p,d) reaction
MesonNet Meeting, 2013年06月, Prague, Czech Republic, trueStudy of mixing properties of mesonic resonances
第68回日本物理学会年次大会, 2013年03月, 広島大学東広島キャンパス, falseFormation of eta'(958) nucleus bound state
ELPH研究会ダブルメソン生成とバリオン分光, 2012年11月, 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, falseFormation of the eta'(958)mesic nuclei in missing mass specroscopies
XI International Conference on Hypernuclear and Strange Particle Physics, 2012年10月, Barcelona University, Barcelona, SPAIN, trueFormation of eta'(958) mesic nuclei by missing mass spectroscopy
Seminar talk at Technische Universitat Munchen, 2012年10月, Technische Universitat Munchen, ドイツ・ミュンヘン, trueFormation of eta'(958) mesic nuclei by the (p,d) reaction at GSI
Seminar talk at GSI, 2012年09月, GSI, ダルムシュタット、ドイツ, trueFormation of the eta'(958) meson bound states and chiral symmetry inmeidum
The 20th International IUPAP Conference on FewBody Problems in Physics (FB20), 2012年08月, IUPAP, Kyushu University, 福岡市国際会議場, trueComposite and elementary natures of mesonic resonances
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, 2012年07月, 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, falseeta'(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
第67回日本物理学会年次大会, 2012年03月, falseFormation spectra of eta' mesic nuclei by the (p,d) reaction
eta' inmedium workshop, 2012年02月, trueFormation of eta'(958) meson bound states in nuclei at JPARC
Workshop on:\nFuture Prospects of Hadron Physics at JPARC\nand Large Scale Computational Physics, 2012年02月, trueeta'(958) meson bound states and their formations
Workshop on:_x000B_ "Elucidation of New Hadrons with a Variety of Flavors“_x000B_ GrantinAid for Scientific Research on Innovative Areas ?, 2012年02月, trueComposite 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, trueパサージュ（２２Ｂ）
パサージュ（２２Ａ）
ハドロン物理学演習
数物特別セミナーＢ
力学１
ハドロン物理学
数物特別セミナーＡ
計算機処理演習
計算機処理
応用複素解析演習
力学演習
力学１演習
原子核理論セミナー
原子核物理学特論
シミュレーション物理
力学1演習
計算機物理