Search for the rare decay $\Lambda_{c}^{+} \to p\mu^+\mu^-$

TL;DR

This paper reports a search for the rare decay $ ext{Lambda}_c^+ o p\, extmu^+ extmu^-$ using LHCb data, setting upper limits on its branching fraction and observing a first-time signal in the $ extomega$ mass region.

Contribution

The study provides the first observation of a signal in the $ extomega$ dimuon mass region and sets new upper limits on the decay's branching fraction.

Findings

No significant signal outside resonance regions.

First observation of a signal in the $ extomega$ mass region.

Upper limits on the branching fraction are established.

Abstract

A search for the flavor-changing neutral-current decay $\Lambda_{c}^{+} \to p\mu^+\mu^-$ is reported using a data set corresponding to an integrated luminosity of $3.0\rm fb^{-1}$ collected by the LHCb collaboration. No significant signal is observed outside of the dimuon mass regions around the $\phi$ and $\omega$ resonances and an upper limit is placed on the branching fraction of $\mathcal{B} (\Lambda_{c}^{+} \to p\mu^+\mu^-) < 7.7~(9.6)\times 10^{-8}~{\rm at}~90\%~(95\%)$ confidence level. A significant signal is observed in the $\omega$ dimuon mass region for the first time.