Speaker
Description
In this talk, we consider the rare decay channel $B_s\rightarrow\mu\mu\gamma$, the radiative counterpart of the very rare $B_s\rightarrow\mu\mu$ decay, from both theoretical and experimental perspectives. This decay is sensitive to possible new vector couplings in the $b\rightarrow s\mu\mu$ interaction vertex. Using different form factors parametrizations of the $B_s\rightarrow\gamma$ transition, we study the differential and integrated branching fractions in the region of high invariant dimuon mass. Additionally, we consider the effective lifetime of $B_s\rightarrow\mu\mu\gamma$ as a new observable, sensitive to non-SM-like CP violation. In addition, we present the first experimental search of this channel in LHCb, through a partial reconstruction method, and we discuss the possibilities of improving and extending this measurement in Run 2 data, and the prospects using the upcoming Run 3 data.
