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Observation of the Leptonic Decay D^{+}→τ^{+}ν_{τ}.
- Source :
-
Physical review letters [Phys Rev Lett] 2019 Nov 22; Vol. 123 (21), pp. 211802. - Publication Year :
- 2019
-
Abstract
- 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_{μ})=(3.74±0.17)×10^{-4}, we obtain R_{τ/μ}=Γ(D^{+}→τ^{+}ν_{τ})/Γ(D^{+}→μ^{+}ν_{μ})=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 Cabibbo-Kobayashi-Maskawa matrix element |V_{cd}| that are consistent with, but less precise than, other determinations.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 123
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 31809130
- Full Text :
- https://doi.org/10.1103/PhysRevLett.123.211802