Search for Bs->mumu and Bd->mumu at LHCb

TL;DR

This paper reports a search for rare Bs->mumu and Bd->mumu decays using LHCb data, setting upper limits on their branching fractions due to no significant signal observed.

Contribution

First search for Bs->mumu and Bd->mumu decays at 7 TeV with LHCb, establishing new upper limits on their branching fractions.

Findings

No significant excess observed over background

Upper limits set: BR(Bs->mumu) < 5.6×10^{-8}

Upper limit for BR(Bd->mumu) < 1.5×10^{-8}

Abstract

A search for the decays Bs->mumu and Bd->mumu is performed with about 37 pb-1 of pp collisions at \sqrt(s) = 7 TeV collected by the LHCb experiment at the Large Hadron Collider at CERN. The observed numbers of events are consistent with the background expectations. The resulting upper limits on the branching fractions are BR(Bs->mumu) < 5.6 * 10^{-8} and B(Bd->mumu) <1.5 * 10^{-8} at 95% confidence level.