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Observation of the Leptonic Decay D+τ+ντ

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 123, 211802 – Published 22 November 2019

Abstract

We report the first observation of D+τ+ντ with a significance of 5.1σ. We measure B(D+τ+ντ)=(1.20±0.24stat±0.12syst)×103. Taking the world average B(D+μ+νμ)=(3.74±0.17)×104, we obtain Rτ/μ=Γ(D+τ+ντ)/Γ(D+μ+νμ)=3.21±0.64stat±0.43syst., which is consistent with the standard model expectation of lepton flavor universality. Using external inputs, our results give values for the D+ decay constant fD+ and the Cabibbo-Kobayashi-Maskawa matrix element |Vcd| that are consistent with, but less precise than, other determinations.

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  • Received 23 August 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.211802

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

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Vol. 123, Iss. 21 — 22 November 2019

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