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Title: | Measurement of the Ratio of Branching Fractions B(¯B0→D*+τ−¯ντ)/B(¯B0→D*+μ−¯νμ) |
Author: | Badalov, Alexey Calvo Gómez, Míriam Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 9-Sep-2015 |
Publisher: | American Physical Society |
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 μ ν τ . 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.115.111803 |
It is part of: | Physical Review Letters, 2015, vol. 115, num. 11, p. 111803 |
URI: | http://hdl.handle.net/2445/132872 |
Related resource: | https://doi.org/10.1103/PhysRevLett.115.111803 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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