| Nucleon Resonances in the π~-p → K~0Λ Reaction near Threshold |
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| 基金项目： | Supported by the Ministry of Science and Technology of China under Grant No. 2014CB845406, the National Natural Science Foundation of China under Grant Nos. 11105126, 11375024, 11175220, the one Hundred Person Project of Chinese Academy of Science under Grant No. Y101020BR0, the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry |
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| 摘 要： |
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| 收稿时间： | 2014-09-25 |
Nucleon Resonances in the π-p→K0Λ Reaction near Threshold |
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| Authors: | WU Cheng-Zu L&# Qi-Fang XIE Ju-Jun CHEN Xu-Rong |
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| Institution: | 1. Department of Physics, Dalian University of Technology, Dalian 116024, China;
2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
3. Department of Physics, Zhengzhou University, Zhengzhou 450001, China;
4. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | We investigate the two-body reaction π-p→K0Λ within the effective Lagrangian approach and the isobar model. In addition to the "background" contributions from t-channel K* exchange, u-channel Σ(1192) and Σ*(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 total 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 Σ(1192) and Σ*(1385) exchanges give the minor contributions. |
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| Keywords: | nucleon resonances Lagrangian approach |
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