Speaker
Description
Searches for rare decays of $B$ mesons into final states including four or six muons are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 5.6 fb$^{-1}$. These decays are experimental signatures of hierarchical sectors beyond the Standard Model proceeding via flavor-violating heavy vectors and a set of light pseudo-Goldstone bosons $a_{1,2}$ spanning a range of lifetimes. The decay modes of interest are $B_s^0 \rightarrow \mu^+\mu^-\mu^+\mu^-$, $B^+ \rightarrow K^+\mu^+\mu^-\mu^+\mu^-$, $B_s^0 \rightarrow \mu^+\mu^-\mu^+\mu^-\mu^+\mu^-$ and $B^+ \rightarrow K^+\mu^+\mu^-\mu^+\mu^-\mu^+\mu^-$. Expected upper limits are set at the 95% confidence level on their branching fractions and in the event of a discovery, they will be measured.
