Role of t-channel meson exchanges in S-wave πN and KN scatterings  

作　　者：吴锋泉 张印杰 邹冰松 

机构地区：[1]Institute of High Energy Physics, Chinese Academy of Sciences

出　　处：《Chinese Physics C》2008年第8期629-633,共5页中国物理C（英文版）

基　　金：National Natural Science Foundation of China (10435080, 10521003);Chinese Academy of Sciences (KJCX3-SYW-N2)

摘　　要：The low-energy S-wave πN and KN scatterings are studied by using the K-matrix approach within the meson exchange framework. The t-channel meson exchanges, especially ρ and σ exchanges, are found to play a very important role in these two processes. The t-channel p exchange determines the isospin structure of the scattering amplitudes, it gives attractive force in the low isospin state but repulsive force in the high isospin state. The t-channel σ exchange gives a very large contribution in these two processes, while it is negligible in meson-meson S-wave scatterings.The low-energy S-wave πN and KN scatterings are studied by using the K-matrix approach within the meson exchange framework. The t-channel meson exchanges, especially ρ and σ exchanges, are found to play a very important role in these two processes. The t-channel p exchange determines the isospin structure of the scattering amplitudes, it gives attractive force in the low isospin state but repulsive force in the high isospin state. The t-channel σ exchange gives a very large contribution in these two processes, while it is negligible in meson-meson S-wave scatterings.

关 键 词：meson exchange K-MATRIX πK KN 

分 类 号：O572.33[理学—粒子物理与原子核物理]