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

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

机构地区：[1]School of Physics and Nuclear Energy Engineering, Beihang University [2]Institute of High Energy Physics, Chinese Academy of Sciences

出　　处：《Science Bulletin》2016年第4期307-312,共6页科学通报（英文版）

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)

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.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 of 4.26 or 4.6 GeV, 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.

关 键 词：Charged lepton flavor violation Branching fraction New physics 

分 类 号：O572.32[理学—粒子物理与原子核物理]