Szczegóły publikacji
Opis bibliograficzny
Measurement of the ratio of branching fractions $\beta(\bar{B}^{0} \to D*^{+}\tau^{-}\bar{\nu}_{\tau})$/$\beta(\bar{B}^{0} \to D*^{+}\mu^{-}\bar{\nu}_{\mu})$ / R. Aaij, [et al.], M. FIRLEJ, [et al.], T. FIUTOWSKI, [et al.], M. IDZIK, [et al.], W. KUCEWICZ, [et al.], P. MORAWSKI, [et al.], J. MOROŃ, [et al.], A. OBŁĄKOWSKA-MUCHA, [et al.], K. ŚWIENTEK, [et al.], T. SZUMLAK, [et al.] // Physical Review Letters ; ISSN 0031-9007. — 2015 — vol. 115 iss. 11, S. 111803-1–111803-10. — Bibliogr. s. 111803-6–111803-7. — W. Kucewicz – dod. afiliacja: Polish Academy of Sciences
Autorzy (3000)
Dane bibliometryczne
| ID BaDAP | 94493 |
|---|---|
| Data dodania do BaDAP | 2016-02-04 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevLett.115.111803 |
| Rok publikacji | 2015 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Review Letters |
Abstract
The branching fraction ratio R(D∗)≡B(B¯0→D*+τ−ν¯τ)/B(B¯0→D*+μ−ν¯μ) is measured using a sample of proton-proton collision data corresponding to 3.0 fb−1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τ−→μ−ν¯μντ. The semitauonic decay is sensitive to contributions from non-standard-model particles that preferentially couple to the third generation of fermions, in particular, Higgs-like charged scalars. A multidimensional fit to kinematic distributions of the candidate B¯0 decays gives R(D∗)=0.336±0.027(stat)±0.030(syst). This result, which is the first measurement of this quantity at a hadron collider, is 2.1 standard deviations larger than the value expected from lepton universality in the standard model.
