First measurement of the differential branching fraction and $CP$ asymmetry of the $B^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ decay

LHCb collaboration, R. Aaij, B. Adeva +723

The differential branching fraction with respect to the dimuon invariant mass squared, and the $CP$ asymmetry of the $B^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ decay are measured for the first time.…