Abstract
A search for the rare leptonic decay ${{{B} ^+}} \!\rightarrow {\mu ^+} {\mu ^-} {\mu ^+} {{\upnu } _\mu } $ is performed using proton-proton collision data corresponding to an integrated luminosity of $4.7 \, {\hbox {fb}}^{-1}$ collected by the LHCb experiment. The search is carried out in the region where the lowest of the two ${\mu ^+\mu ^-} $ mass combinations is below $980 {\mathrm {\,MeV\!/}c^2} $ . The data are consistent with the background-only hypothesis and an upper limit of $1.6 \times 10^{-8}$ at 95% confidence level is set on the branching fraction in the stated kinematic region.
Original language | English |
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Article number | 675 |
Journal | The European Physical Journal C |
Volume | C79 |
Issue number | 8 |
DOIs | |
Publication status | Published - 13 Aug 2019 |