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Title: | Measurement of the Ratio of Branching Fractions B (Bc+ →j /ψτ+ντ)/ B (Bc+ →j /ψμ+νμ) |
Author: | Alfonso Albero, Alejandro Badalov, Alexey Calvo Gómez, Míriam Camboni, Alessandro Coquereau, Samuel Fernandez, G. Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 23-Mar-2018 |
Publisher: | American Physical Society |
Abstract: | A measurement is reported of the ratio of branching fractions R ( J / ψ ) = B ( B + c → J / ψ τ + ν τ ) / B ( B + c → J / ψ μ + ν μ ) , where the τ + lepton is identified in the decay mode τ + → μ + ν μ ¯ ν τ . This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb − 1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay B + c → J / ψ τ + ν τ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R ( J / ψ ) = 0.71 ± 0.17 ( stat ) ± 0.18 ( syst ) . This result lies within 2 standard deviations above the range of central values currently predicted by the standard model. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.120.121801 |
It is part of: | Physical Review Letters, 2018, vol. 120, num. 12, p. 121801 |
URI: | http://hdl.handle.net/2445/132496 |
Related resource: | https://doi.org/10.1103/PhysRevLett.120.121801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) |
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