分类: 物理学 >> 核物理学 提交时间: 2016-09-14
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 of 4.26 or 4.6~GeV, in the framework of the BESIII software system. The 90\% confidence level upper limits on $\BR(\tau^- \to \gamma \mu^-)$ are estimated assuming no signal is produced. We also obtain the sensitivity on $\BR(\tau^- \to \gamma \mu^-)$ 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.