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Strong Constraints on the Rare Decays B0s→μ+μ− and B0→μ+μ− Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Domingo Bonal, Francesc Garrido Beltrán, Lluís Gascón Fora, David Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Pie Valls, B. (Blai) Potterat, Cédric Puig Navarro, Albert Roselló, M. Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Particle physics Experiments A search for B 0 s → μ + μ − and B 0 → μ + μ − decays is performed using 1.0     fb − 1 of p p collision data collected at √ s = 7     TeV with the LHCb experiment at the Large Hadron Collider. For both decays, the number of observed events is consistent with expectation from background and standard model signal predictions. Upper limits on the branching fractions are determined to be B ( B 0 s → μ + μ − ) < 4.5 ( 3.8 ) × 10 − 9 and B ( B 0 → μ + μ − ) < 1.0 ( 0.81 ) × 10 − 9 at 95% (90%) confidence level. 2019-05-22T11:03:22Z 2019-05-22T11:03:22Z 2012-06-05 2019-05-22T11:03:22Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/133691 618975 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.108.231801 Physical Review Letters, 2012, vol. 108, num. 23, p. 231801 https://doi.org/10.1103/PhysRevLett.108.231801 cc by (c) CERN; LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 8 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)