https://doi.org/10.1140/epjc/s10052-022-10260-w
Regular Article - Experimental Physics
Prospects of CKM elements
and decay constant
in
decay at STCF
1
University of South China, 421000, Hengyang, People’s Republic of China
2
State Key Laboratory of Particle Detection and Electronics, 230026, Hefei, People’s Republic of China
3
School of Physical Sciences, University of Science and Technology of China, 230026, Hefei, People’s Republic of China
4
Henan Normal University, 453007, Xinxiang, People’s Republic of China
5
National Demonstration Center for Experimental Physics Education, Henan Normal University, 453007, Xinxiang, China
d
zxrong@ustc.edu.cn
e
zhengb@usc.edu.cn
Received:
1
October
2021
Accepted:
25
March
2022
Published online:
19
April
2022
We report a feasibility study of pure leptonic decay by using a fast simulation software package at STCF. With an expected luminosity of
collected at STCF at a center-of-mass energy of 4.009 GeV, the statistical sensitivity of the branching fraction is determined to be 0.3%. Combining this result with the
quark mixing matrix element
determined from the current global Standard Model fit, the statistical sensitivity of
decay constant,
, is estimated to be 0.2%. Alternatively, combining the current results of
calculated by lattice QCD, the statistical sensitivity of
is determined to be 0.2%, which helps probe possible new physics beyond Standard Model. The unprecedented precision to be achieved at STCF will provide a precise calibration of QCD and rigorous test of Standard Model.
© The Author(s) 2022
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