The Three-Pion Decays of the a1(1260)  

作　　者：Xu Zhang Ju-Jun Xie 张旭;谢聚军(Institute of Modern Physics, Chinese Academy of Sciences;University of Chinese Academy of Sciences)

机构地区：Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China University of Chinese Academy of Sciences,Beijing 101408,China

出　　处：《Communications in Theoretical Physics》2018年第7期60-66,共7页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.11475227 and 11735003;supported by the Youth Innovation Promotion Association CAS(No.2016367)

摘　　要：We investigate the decay of a_1^+(1260) →π^+π^+π^-with the assumption that the a_1(1260) is dynamically generated from the coupled channel ρπ and KK~*interactions. In addition to the tree level diagrams that proceed via a_1^+(1260) →ρ~0π^+→π^+π^+π^-, we take into account also the final state interactions of ππ→ππ and KK →ππ. We calculate the invariant π^+π^-mass distribution and also the total decay width of a_1^+(1260) →π^+π^+π^-as a function of the mass of a_1(1260). The calculated total decay width of a_1(1260) is significantly different from other model calculations and tied to the dynamical nature of the a_1(1260) resonance. The future experimental observations could test of model calculations and would provide vary valuable information on the relevance of the ρπ component in the a_1(1260) wave function.

关 键 词：effective Lagagian approach axial-vector meson final state interactions 

分 类 号：O572.33[理学—粒子物理与原子核物理] TS255.3[理学—物理]