Sensitivity study of searching for τ^-→γμ^- at HIEPA

作     者：Yu-Bo Li Cheng-Ping Shen Chang-Zheng Yuan 

作者机构：School of Physics and Nuclear Energy Engineering Beihang University Institute of High Energy Physics Chinese Academy of Sciences 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2016年第61卷第4期

页      面：307-312页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：the National Natural Science Foundation of China (11235011) the National Basic Research Program of China (2015CB856701) CAS Center for Excellence in Particle Physics (CCEPP) 

主　　题：Charged lepton flavor violation Branching fraction New physics 

摘      要：The charged lepton flavor violation process is a clean and sensitive probe of new physics beyond the Standard Model. A sensitivity study is performed to the process τ^-→γμ^- based on a 3 fb^(-1) inclusive Monte Carlo sample of e^+e^- collisions at a center-of-mass energy of4.26 or 4.6 Ge V, in the framework of the BESIII software system. The 90 % confidence level upper limits on B(τ^-→γμ^-) are estimated assuming no signal is produced. We also obtain the sensitivity on B(τ^-→γμ^-) as a function of the integrated luminosity, to serve as a reference for the HIEPA being proposed in China. It is found that 6.34 ab^(-1) are needed to reach the current best upper limit of 4:4 10^(-8) and about 2510 ab^(-1) are needed to reach a sensitivity of 10^(-9) if the detector design is similar to that of BESIII.