https://doi.org/10.1140/epjc/s10052-022-10265-5
Regular Article - Experimental Physics
Feasibility study of
decay and test of lepton flavor universality with leptonic
decays at STCF
1
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
a
lihuijing@htu.edu.cn
b
luot@fudan.edu.cn
d
zxrong@ustc.edu.cn
Received:
19
October
2021
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
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Funded by SCOAP3