Search for decays of neutral beauty mesons into four muons
LHCb collaboration: R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S., Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez, Cartelle, A.A. Alves Jr, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini,, G. Andreassi, M. Andreotti, J.E. Andrews

TL;DR
This paper reports a search for rare four-muon decays of neutral beauty mesons using LHCb data, setting upper limits on their branching fractions due to no observed signal.
Contribution
First search for non-resonant four-muon decays of B mesons using full Run 1 LHCb data, establishing new upper limits on their branching fractions.
Findings
No signal observed for the decays.
Upper limits on branching fractions set at 95% confidence level.
Results constrain new physics models predicting these decays.
Abstract
A search for the non-resonant decays and 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 and collected at centre-of-mass energies of and , respectively. No signal is observed and upper limits on the branching fractions of the non-resonant decays at confidence level are determined to be \mathcal{B}(B^0_s \rightarrow \mu^{+}\mu^{-}\mu^{+}\mu^{-}) & < 2.5 \times 10^{-9} \mathcal{B}(B^0 \rightarrow \mu^{+}\mu^{-}\mu^{+}\mu^{-}) & < 6.9 \times 10^{-10}.
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