Szczegóły publikacji
Opis bibliograficzny
Observation of the decay $\Lambda^{0}_{b} \to \Lambda^{+}_{c}\tau^{−}\bar{\nu}_{\tau}$ / A. Aaij, [et al.], S. BASHIR, [et al.], M. FIRLEJ, [et al.], T. FIUTOWSKI, [et al.], M. IDZIK, [et al.], S. H. KALAVAN KADAVATH, [et al.], P. KOPCIEWICZ, [et al.], W. KRUPA, [et al.], O. MADEJCZYK, [et al.], M. W. MAJEWSKI, [et al.], J. MOROŃ, [et al.], A. OBŁĄKOWSKA-MUCHA, [et al.], B. RACHWAŁ, [et al.], J. RYŻKA, [et al.], K. ŚWIENTEK, [et al.], T. SZUMLAK, [et al.] // Physical Review Letters ; ISSN 0031-9007. — 2022 — vol. 128 iss. 19 art. no. 191803, s. 191803-1–191803-11. — Bibliogr. s. 191803-6. — Publikacja dostępna online od: 2022-05-13. — S. Hashmi – w publikacji jako: S.H. Kalavan Kadavath
Autorzy (1008)
Dane bibliometryczne
| ID BaDAP | 140450 |
|---|---|
| Data dodania do BaDAP | 2022-06-14 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevLett.128.191803 |
| Rok publikacji | 2022 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
The first observation of the semileptonic b-baryon decay Λb0→Λc+τ-ν¯τ, with a significance of 6.1σ, is reported using a data sample corresponding to 3 fb-1 of integrated luminosity, collected by the LHCb experiment at center-of-mass energies of 7 and 8 TeV at the LHC. The τ- lepton is reconstructed in the hadronic decay to three charged pions. The ratio K=B(Λb0→Λc+τ-ν¯τ)/B(Λb0→Λc+π-π+π-) is measured to be 2.46±0.27±0.40, where the first uncertainty is statistical and the second systematic. The branching fraction B(Λb0→Λc+τ-ν¯τ)=(1.50±0.16±0.25±0.23)% is obtained, where the third uncertainty is from the external branching fraction of the normalization channel Λb0→Λc+π-π+π-. The ratio of semileptonic branching fractions R(Λc+)≡B(Λb0→Λc+τ-ν¯τ)/B(Λb0→Λc+μ-ν¯μ) is derived to be 0.242±0.026±0.040±0.059, where the external branching fraction uncertainty from the channel Λb0→Λc+μ-ν¯μ contributes to the last term. This result is in agreement with the standard model prediction.
