Sensitivity study of the charged lepton flavor violating process $\tau \to \gamma \mu$ at STCF

Author:

Teng Xiang, Xiao-Dong Shi, Da-Yong Wang, Xiao-Rong Zhou

Keyword:

High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex)

journal:

Eur.Phys.J.C 83 (2023) 10, 908

date:

2023-04-29 16:00:00

Abstract

A sensitivity study for the search for the charged lepton flavor violating process $\tau \to \gamma\mu$ at the Super $\tau$-Charm Facility is performed with a fast simulation. With the expected performance of the current detector design and an integrated luminosity of \SI{1}{ab^{-1}} corresponding to one-year of data taking, the sensitivity on the branching fraction (BF) of $\tau \to \gamma\mu$ is estimated to be at the level of \num{e-8}. The sensitivity under different detector performances are also studied. With ideal performance, the BF could be probed to be \num{2.8e-8} at \SI{90}{\percent} confidence level. The sensitivity is expected to scale with the square root of the luminosity, therefore with a total luminosity of \SI{10}{ab^{-1}} corresponding to ten-year of data taking, the sensitivity could reach \num{8.8e-9}, which is about one order of magnitude improvement upon the current best upper limit.

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