Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/133455
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 (Electrònica)
Articles publicats en revistes (Física Quàntica i Astrofísica)

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