Study of the rare decay J/ψ→2γ+hadrons at the BESIII  

作　　者：Feng Zhang Jian-Xiong Wang 张丰;王建雄(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2022年第9期129-136,共8页中国物理C（英文版）

基　　金：the National Natural Science Foundation of China(12135013);National Key Research and Development Program of China(2020YFA0406400)。

摘　　要：The two-photon radiative decay process J/ψ→2γ+hadrons was studied,and the main contribution processes,J/ψ→2γ+ggg and J/ψ→2γ+qˉq,were calculated.With the specific conditions at the BESIII,this rare decay process and the main background process e+e?→γγ+hadrons(qˉq)were investigated.The results show that the ratio of signal to background can reach 1.24 with optimized selection criteria at the BESIII.In addition,distributions of the signal and background are presented.All the results show that the signal is large enough to be experimentally measured.

关 键 词：rare decay of J/ψ branch ratio BESIII 

分 类 号：O572.33[理学—粒子物理与原子核物理]