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Title: | First Evidence for the Decay B0s→μ+μ− |
Author: | Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Domingo Bonal, Francesc Garrido Beltrán, Lluís Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Potterat, Cédric Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 7-Jan-2013 |
Publisher: | American Physical Society |
Abstract: | A search for the rare decays B 0 s → μ + μ − and B 0 → μ + μ − is performed with data collected in 2011 and 2012 with the LHCb experiment at the Large Hadron Collider. The data samples comprise 1.1 fb − 1 of proton-proton collisions at √ s = 8 TeV and 1.0 fb − 1 at √ s = 7 TeV . We observe an excess of B 0 s → μ + μ − candidates with respect to the background expectation. The probability that the background could produce such an excess or larger is 5.3 × 10 − 4 corresponding to a signal significance of 3.5 standard deviations. A maximum-likelihood fit gives a branching fraction of B ( B 0 s → μ + μ − ) = ( 3.2 + 1.5 − 1.2 ) × 10 − 9 , where the statistical uncertainty is 95% of the total uncertainty. This result is in agreement with the standard model expectation. The observed number of B 0 → μ + μ − candidates is consistent with the background expectation, giving an upper limit of B ( B 0 → μ + μ − ) < 9.4 × 10 − 10 at 95% confidence level. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.110.021801 |
It is part of: | Physical Review Letters, 2013, vol. 110, num. 2, p. 021801 |
URI: | http://hdl.handle.net/2445/133455 |
Related resource: | https://doi.org/10.1103/PhysRevLett.110.021801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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