Sensitivity Study of Searching for τ- → γμ- at HIEPA

الأصل · EN

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 (τ- → γμ-) are estimated assuming no signal is produced. We also obtain the sensitivity on (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.