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01565nam a2200169Ia 4500 |
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10.1140-epjc-s10052-022-10265-5 |
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220425s2022 CNT 000 0 und d |
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|a 14346044 (ISSN)
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|a Feasibility study of Ds+→τ+ντ decay and test of lepton flavor universality with leptonic Ds+ decays at STCF
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|b Springer Science and Business Media Deutschland GmbH
|c 2022
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|z View Fulltext in Publisher
|u https://doi.org/10.1140/epjc/s10052-022-10265-5
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|a We report a sensitive study of Ds+→τ+ντ decay via τ+→ e+νeν¯ τ with an integrated luminosity of 1 ab- 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 Ds+→τ+ντ is determined to be 2 × 10 - 4. Combining with our previous prospect of Ds+→μ+νμ, the ratio of the branching fractions for Ds+→τ+ντ over Ds+→μ+νμ can achieve a relative statistical precision of 0.5%, which will provide the most stringent test of the τ-μ lepton flavor universality in heavy quark decays. Taking the decay constant fDs+ from lattice QCD calculations or the CKM matrix element | Vcs| from the CKMfitter group as an input, the relative statistical uncertainties for | Vcs| and fDs+ are estimated to be 0.3% and 0.2%, respectively. © 2022, The Author(s).
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|a Li, H.
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|a Luo, T.
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|a Shi, X.
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|a Zhou, X.
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|t European Physical Journal C
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