Search for decays of neutral beauty mesons into four muons

Abstract

A search for the non-resonant decays $B_s^0\to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ and $B^0\to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$ is presented. The measurement is performed using the full Run 1 data set collected in proton-proton collisions by the LHCb experiment at the LHC. The data correspond to integrated luminosities of $1$ and $2{\mathrm{fb}}^{-1}$ collected at centre-of-mass energies of $7$ and $8\mathrm{TeV}$, respectively. No signal is observed and upper limits on the branching fractions of the non-resonant decays at $95\%$ confidence level are determined to be \mathcal{B}(B^0_s \rightarrow μ^{+}μ^{-}μ^{+}μ^{-}) & < 2.5 \times 10^{-9} \mathcal{B}(B^0 \rightarrow μ^{+}μ^{-}μ^{+}μ^{-}) & < 6.9 \times 10^{-10}.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-043.html

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