Regular Article - Experimental Physics
Feasibility study of decay and test of lepton flavor universality with leptonic decays at STCF
Henan Normal University, 453007, Xinxiang, People’s Republic of China
2 National Demonstration Center for Experimental Physics Education (Henan Normal University), 453007, Xinxiang, People’s Republic of China
3 Fudan University, 200443, Shanghai, People’s Republic of China
4 Key Laboratory of Nuclear Physics on Ion-Beam Application (MOE) and Institute of Modern Physics, Fudan University, 200443, Shanghai, People’s Republic of China
5 University of Science and Technology of China, 230026, Hefei, People’s Republic of China
6 State Key Laboratory of Particle Detection and Electronics, 230026, Hefei, People’s Republic of China
Accepted: 25 March 2022
Published online: 8 April 2022
We report a sensitive study of decay via with an integrated luminosity of 1 ab at the center-of-mass energy of 4.009 GeV at a future Super Tau Charm Facility (STCF). Under the help of the fast simulation software package, the statistical sensitivity for the absolute branching fraction of is determined to be . Combining with our previous prospect of , the ratio of the branching fractions for over can achieve a relative statistical precision of 0.5%, which will provide the most stringent test of the - lepton flavor universality in heavy quark decays. Taking the decay constant from lattice QCD calculations or the CKM matrix element from the CKMfitter group as an input, the relative statistical uncertainties for and are estimated to be 0.3% and 0.2%, respectively.
© The Author(s) 2022
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