Abstract
AbstractWe report a sensitive study of $$D_s^+ \rightarrow \tau ^+ \nu _{\tau }$$
D
s
+
→
τ
+
ν
τ
decay via $$\tau ^+ \rightarrow e^+ \nu _e \bar{\nu }_{\tau }$$
τ
+
→
e
+
ν
e
ν
¯
τ
with an integrated luminosity of 1 ab$$^{-1}$$
-
1
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 $$D_s^+ \rightarrow \tau ^+ \nu _{\tau }$$
D
s
+
→
τ
+
ν
τ
is determined to be $$2\times 10^{-4}$$
2
×
10
-
4
. Combining with our previous prospect of $$D_s^+ \rightarrow \mu ^+ \nu _{\mu }$$
D
s
+
→
μ
+
ν
μ
, the ratio of the branching fractions for $$D_s^+ \rightarrow \tau ^+ \nu _{\tau }$$
D
s
+
→
τ
+
ν
τ
over $$D_s^+ \rightarrow \mu ^+ \nu _{\mu }$$
D
s
+
→
μ
+
ν
μ
can achieve a relative statistical precision of 0.5%, which will provide the most stringent test of the $$\tau $$
τ
-$$\mu $$
μ
lepton flavor universality in heavy quark decays. Taking the decay constant $$f_{D_s^+}$$
f
D
s
+
from lattice QCD calculations or the CKM matrix element $$|V_{cs}|$$
|
V
cs
|
from the CKMfitter group as an input, the relative statistical uncertainties for $$|V_{cs}|$$
|
V
cs
|
and $$f_{D_s^+}$$
f
D
s
+
are estimated to be 0.3% and 0.2%, respectively.
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Reference65 articles.
1. D. Silverman, H. Yao, Phys. Rev. D 38, 214 (1988). https://doi.org/10.1103/PhysRevD.38.214
2. S.S. Gershtein, M.Y. Khlopov, JETP Lett. 23, 338 (1976)
3. M.Y. Khlopov, Sov. J. Nucl. Phys. 28, 583 (1978)
4. P. A. Zyla et al. (Particle Data Group), Prog. Theor. Exp. Phys. 2020, 083C01 (2020).https://pdg.lbl.gov/index.html
5. S. Aoki et al. (Flavour Lattice Averaging Group), Eur. Phys. J. C 80, 113 (2020). https://doi.org/10.1140/epjc/s10052-019-7354-7
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献