Search for the rare decay Bs->mumu

TL;DR

This paper reports a search for the rare decay Bs->mumu using Fermilab Tevatron data, setting an upper limit on its branching fraction due to no significant signal observed.

Contribution

The study provides the first comprehensive search for Bs->mumu at the Tevatron with the full D0 dataset, establishing a new upper limit on its branching ratio.

Findings

No significant excess of Bs->mumu events observed.

Set an upper limit on BR(Bs->mumu) < 15×10^(-9) at 95% confidence level.

Enhanced sensitivity achieved through multivariate analysis.

Abstract

We perform a search for the rare decay Bs->mumu using data collected by the D0 experiment at the Fermilab Tevatron Collider. This result is based on the full D0 Run II dataset corresponding to 10.4 fb^(-1) of ppbar collisions at sqrt(s) = 1.96 TeV. We use a multivariate analysis to increase the sensitivity of the search. In the absence of an observed number of events above the expected background, we set an upper limit on the decay branching fraction of BR(Bs->mumu) < 15x10^(-9) at the 95% C.L.