Masses and Sigma Terms of Pentaquarks in Chiral Perturbation Theory  

作　　者：LI Xiao-Ya LU Xiao-Fu 

机构地区：[1]Department of Physics, Sichuan University, Chengdu 610064, China [2]Institute of Theoretical Physics, the Chinese Academy of Sciences, Beijing 100080, China [3]China Center of Advanced Science and Technology (World Laboratory), Beijing 100080, China

出　　处：《Communications in Theoretical Physics》2006年第4X期704-710,共7页理论物理通讯（英文版）

基　　金：The project supported in part by National Natural Science Foundation of China under Grant No. 90103018.

摘　　要：Assuming that the recently θ＋ and other exotic resonances belong to the pentaquark i0 of SU（3）I with J^P = 1/2, we constructed a relativistic effective lagrangian in the frame work of baryon chiral perturbation theory. The masses of pentaquarks under isospin symmetry is determined by calculating the propagator to one loop, where the extended on-mass-shell renormalization scheme is applied. Using the experimental data for masses of θ＋, Ξ and N, we estimated the mass of Σ and the a terms.

关 键 词：PENTAQUARK chiral perturbation theory σ term 

分 类 号：O571[理学—粒子物理与原子核物理]