Bs to mu mu gamma from Bs to mu mu

TL;DR

This paper proposes a novel method to search for the rare decay Bs to mu mu gamma by analyzing its spectrum as a contamination in Bs to mu mu searches, potentially enhancing sensitivity to new physics.

Contribution

It introduces a new strategy to detect Bs to mu mu gamma decays within existing Bs to mu mu datasets, leveraging the spectral overlap for improved analysis.

Findings

Method feasible with current LHC Run-2 data

Potential to probe wider set of effective operators

Enhances sensitivity to flavor physics discrepancies

Abstract

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.