  The Bs to mu mu gamma decay offers sensitivity to a wider set of effective
operators than its non-radiative counterpart Bs to mu mu, and a set that is
interesting in the light of present-day discrepancies in flavour data. On the
other hand, the direct measurement of the Bs to mu mu gamma decay poses
challenges with respect to the Bs to mu mu one. We present a novel strategy to
search for Bs to mu mu gamma decays in the very event sample selected for Bs to
mu mu searches. The method consists in extracting the Bs to mu mu gamma
spectrum as a "contamination" to the Bs to mu mu one, as the signal window for
the latter is extended downward with respect to the peak region. We provide
arguments for the actual practicability of the method already on Run-2 data of
the LHC.

High Energy Physics - Phenomenology