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First observation of the decay B+→π+μ+μ−

By LHCb Collaboration, Carlos Abellan Beteta, M. Calvo Gómez, Alessandro Camboni, Albert Comerma Montells, F. Domingo Bonal, Lluís Garrido Beltrán, David Gascón Fora, Marc Grabalosa Gándara, Ricardo Graciani Díaz, Eugeni Graugés Pous, E. Lopez Asamar, Antonio Pérez-Calero Yzquierdo, Eduardo Picatoste Olloqui, B. (Blai) Pie Valls, Cédric Potterat, Albert Puig Navarro, M. Roselló, Hugo (Ruiz Pérez) Ruiz, R. Vázquez Gómez and X. Vilasis-Cardona


A discovery of the rare decay B + → π + μ + μ − is presented. This decay is observed for the first time, with 5.2 σ significance. The observation is made using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, collected with the LHCb detector. The measured branching fraction is (2.3 ± 0.6 (stat.) ± 0.1 (syst.))×10−8, and the ratio of the B + → π + μ + μ − and B + → K + μ + μ − branching fractions is measured to be 0.053 ± 0.014 (stat.) ± 0.001 (syst.)

Topics: Teoria quàntica de camps, Partícules (Física nuclear), Hadrons, Física nuclear, Detectors de radiació, Quantum field theory, Particles (Nuclear physics), Hadrons, Nuclear physics, Nuclear counters
Publisher: Springer Verlag
Year: 2014
DOI identifier: 10.1007/JHEP12(2012)125
OAI identifier: oai:diposit.ub.edu:2445/56475

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