Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/132496
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
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