Szczegóły publikacji
Opis bibliograficzny
Evidence for $B^{-} \to D^{**0}\tau^{-}\bar{\nu_{\tau}}$ decays / R. Aaij, [et al.], S. BASHIR, [et al.], M. FIRLEJ, [et al.], T. FIUTOWSKI, [et al.], W. GOMUŁKA, [et al.], S. HASHMI, [et al.], M. IDZIK, [et al.], P. KOPCIEWICZ, [et al.], M. W. MAJEWSKI, [et al.], J. MOROŃ, [et al.], A. OBŁĄKOWSKA-MUCHA, [et al.], J. RYŻKA, [et al.], K. ŚWIENTEK, [et al.], T. SZUMLAK, [et al.], A. UKLEJA, [et al.] // Physical Review Letters ; ISSN 0031-9007 . — 2025 — vol. 135 iss. 2 art. no. 021802, s. 021802-1–021802-15. — Bibliogr. s. 021802-7–021802-8, Abstr. — Publikacja dostępna online od: 2025-07-08
Autorzy (1160)
Dane bibliometryczne
| ID BaDAP | 163515 |
|---|---|
| Data dodania do BaDAP | 2025-10-20 |
| Tekst źródłowy | URL |
| DOI | 10.1103/rj9h-n4w1 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
The first evidence for the decay B-→D**0τ-ν¯τ is obtained using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb-1, at centre-of-mass energies of 7, 8, and 13 TeV. Here, the D**0 meson represents any of the three excited charm mesons D1(2420)0, D2*(2460)0, and D1′(2400)0. The B-→D**0τ-ν¯τ signal is measured with a significance of 3.5σ, including systematic uncertainties. The combined branching fraction B(B-→D1,2**0τ-ν¯τ)×B(D1,2**0→D*+π-), where D1,2**0 denotes both D1(2420)0 and D2*(2460)0 contributions, is measured to be [0.051±0.013(stat)±0.006(syst)±0.009(ext)]%, where the last uncertainty reflects that of the branching fraction of the normalization channel B-→D1,2**0Ds-(*). The ratio between the tauonic and muonic semileptonic B decays, with the latter taken from world average values, is also determined and found to be R(D1,2**0)=0.13±0.03(stat)±0.01(syst)±0.02(ext).
