Alfonso Albero, AlejandroCalvo Gómez, MíriamCamboni, AlessandroCoquereau, SamuelGascón Fora, DavidGironella Gironell, PereGraciani Díaz, RicardoGraugés Pous, EugeniVilasis-Cardona, XavierLHCb CollaborationMarin Benito, Carla2020-05-252020-05-252019-08-131434-6044https://hdl.handle.net/2445/162206A search for the rare leptonic decay B+→μ+μ-μ+νμ is performed using proton-proton collision data corresponding to an integrated luminosity of 4.7fb-1 collected by the LHCb experiment. The search is carried out in the region where the lowest of the two μ+μ- mass combinations is below 980MeV/c2. The data are consistent with the background-only hypothesis and an upper limit of 1.6 × 10 - 8 at 95% confidence level is set on the branching fraction in the stated kinematic region.12 p.application/pdfengcc-by (c) Alfonso Albero, AlejandroA. et al., 2019http://creativecommons.org/licenses/by/3.0/esFísica de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6963702020-05-25info:eu-repo/semantics/openAccess