Observation of the Leptonic Decay D + → τ + ν τ

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doi:10.1103/physrevlett.123.211802

Title: Observation of the Leptonic Decay $D^{+} \to τ^{+} ν_{τ}$

Journal Article · 22 November 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.123.211802 · OSTI ID:1575306

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Balossino, I.; Ban, Y.; Begzsuren, K.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

We report the first observation of D⁺ → τ⁺ν_τ with a significance of 5.1σ. We measure B(D⁺ → τ⁺ν_τ ) = (1.20 ± 0.24_stat ± 0.12_syst) × 10^–3. Taking the world average B(D⁺ → μ⁺ν_τ ) = (3.74 ± 0.17) × 10^–4, we obtain R_τ/μ = Γ(D⁺ → τ⁺ν_τ )/Γ(D⁺ → μ⁺ν_τ) = 3.21 ± 0.64_stat ± 0.43_syst, which is consistent with the Standard Model expectation of lepton flavor universality. Using external inputs, our results give values for the D⁺ decay constant f_D⁺ and the CKM matrix element |V_cd| that are consistent with, but less precise than, other determinations.

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Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC0010118; SC0012069

OSTI ID:: 1575306

Alternate ID(s):: OSTI ID: 1755649

Journal Information:: Physical Review Letters, Vol. 123, Issue 21; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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