We investigate the two-body reaction π^-p→ K°A within the effective Lagrangian approach and the isobar model. In addition to the "background" contributions from t-channel K* exchange, u-channel N*(1192) a...We investigate the two-body reaction π^-p→ K°A within the effective Lagrangian approach and the isobar model. In addition to the "background" contributions from t-channel K* exchange, u-channel N*(1192) and ∑*(1385) exchanges, and s-channel nucleon pole terms, the contributions from the nucleon resonances N*(1535), N*(1650), and N* (1720) are investigated. It is shown that the inclusion of these nucleon resonances contributions leads to a good descrip- tion of the experimental totM and differential cross sections data at low energy region. The s-channel N* (1535), N* (1650), and N*(1720) resonances and the t-channel K* exchange give the dominant contributions below W = 1.76 GeV, while the s-channel nucleon pole, u-channel ∑(1192) and ∑*(1385) exchanges give the minor contributions.展开更多
基金Supported by the Ministry of Science and Technology of China under Grant No.2014CB845406the National Natural Science Foundation of China under Grant Nos.11105126,11375024,11175220+1 种基金the one Hundred Person Project of Chinese Academy of Science under Grant No.Y101020BR0the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry
文摘We investigate the two-body reaction π^-p→ K°A within the effective Lagrangian approach and the isobar model. In addition to the "background" contributions from t-channel K* exchange, u-channel N*(1192) and ∑*(1385) exchanges, and s-channel nucleon pole terms, the contributions from the nucleon resonances N*(1535), N*(1650), and N* (1720) are investigated. It is shown that the inclusion of these nucleon resonances contributions leads to a good descrip- tion of the experimental totM and differential cross sections data at low energy region. The s-channel N* (1535), N* (1650), and N*(1720) resonances and the t-channel K* exchange give the dominant contributions below W = 1.76 GeV, while the s-channel nucleon pole, u-channel ∑(1192) and ∑*(1385) exchanges give the minor contributions.