Searches for rare $B_s^0$ and $B^0$ decays into four muons

Abstract

Searches for rare $B_s^0$ and $B^0$ decays into four muons are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 ${\text{fb}}^{-1}$. Direct decays and decays via light scalar and $J/\ddot{I}ˆ$ resonances are considered. No evidence for the six decays searched for is found and upper limits at the 95% confidence level on their branching fractions ranging between $1.8\times 10^{-10}$ and $2.6\times 10^{-9}$ are set.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-039.html (LHCb public pages)