Search for the rare decay $${{{B} ^+}} \!\rightarrow {\mu ^+} {\mu ^-} {\mu ^+} {{\upnu } _\mu } $$ B + → μ + μ - μ + ν μ

• Main Authors: Aaij, R. (Author), Beteta, C. A (Author), Adeva, B. (Author), Adinolfi, M. (Author), Aidala, C. A (Author), Ajaltouni, Z. (Author), Akar, S. (Author), Albicocco, P. (Author), Albrecht, J. (Author), Alessio, F. (Author), Alexander, M. (Author), Albero, A. A (Author), Alkhazov, G. (Author), Cartelle, P. A (Author), Jr, A. A A (Author), Amato, S. (Author), Amerio, S. (Author), Amhis, Y. (Author), An, L. (Author), Anderlini, L. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2021-09-20T17:29:06Z.
• Subjects: Article
• Online Access: Get fulltext

Abstract A search for the rare leptonic decay $${{{B} ^+}} \!\rightarrow {\mu ^+} {\mu ^-} {\mu ^+} {{\upnu } _\mu } $$ B + → μ + μ - μ + ν μ is performed using proton-proton collision data corresponding to an integrated luminosity of $$4.7 \, {\hbox {fb}}^{-1}$$ 4.7 fb - 1 collected by the LHCb experiment. The search is carried out in the region where the lowest of the two $${\mu ^+\mu ^-} $$ μ + μ - mass combinations is below $$980 {\mathrm {\,MeV\!/}c^2} $$ 980 MeV / c 2 . The data are consistent with the background-only hypothesis and an upper limit of $$1.6 \times 10^{-8}$$ 1.6 × 10 - 8 at 95% confidence level is set on the branching fraction in the stated kinematic region.