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scattering parameters and possible 
bound state from 
photoproduction on the deuteron石川 貴嗣*; 土川 雄介; FOREST Collaboration*; 他48名*
Acta Physica Polonica B, 51(1), p.27 - 32, 2020/00
被引用回数：0 パーセンタイル：0.00(Physics, Multidisciplinary)Two physics programs, determination of low-energy scattering parameters between the eta meson () and nucleon (
), and search for a possible bound state between the eta prime meson (
) and deuteron (
), using photoproduction from the deuteron target are conducted at ELPH, Tohoku University. An experiment is carried out to determine the low-energy scattering parameters using a special kinematics. The measurement is currently in progress to determine the real part of the -neutron (
) scattering length. A possible bound state is theoretically predicted, and a structure corresponding to the state can be observed via the 
reaction at incident energies around 1.2 GeV. The angular differential cross sections are determined at backward emission angles. The tail of the corresponding peak is not observed, and the background level is much higher than predicted.
invariant-mass spectrum in the 
reaction?関原 隆泰; Oset, E.*; Ramos, A.*
Acta Physica Polonica B, 48(10), p.1869 - 1874, 2017/10
被引用回数：1 パーセンタイル：10.81(Physics, Multidisciplinary)In this contribution we theoretically investigate what is the origin of the peak structure observed in the E15 experiment at J-PARC. Since the peak exists near the 
threshold, we expect two scenarios to produce the peak. One is that the 
is generated but it does not correlate with 
, and the uncorrelated - system subsequently decays into . The other is that the 
quasi-bound state is indeed generated and decays into . We calculate the invariant mass spectrum of the reaction with these two scenarios and compare it with the experimental one to interpret the experimental peak structure.
Oset, E.*; 他10名*; 岡 眞
Acta Physica Polonica B, 47(2), p.357 - 365, 2016/02
被引用回数：3 パーセンタイル：25.43(Physics, Multidisciplinary)メソン複数個を含むエキゾチックハドロンに関する研究成果をレビューした。未発見の状態については、今後の実験による探索を示唆した。
