Search for Bs --> mu+mu- and Bd --> mu+mu- Decays with 2fb-1 of ppbar Collisions

TL;DR

This study searched for rare Bs and Bd meson decays into muon pairs using 2fb-1 of proton-antiproton collision data, setting upper limits on their branching fractions due to no significant signal detection.

Contribution

First search for Bs and Bd to mu+mu- decays at Fermilab with 2fb-1 data, establishing new upper limits on their branching fractions.

Findings

No significant excess observed over background.

Upper limit on B(Bs-->mu+mu-) < 5.8×10^-8.

Upper limit on B(Bd-->mu+mu-) < 1.8×10^-8.

Abstract

We have performed a search for Bs-->mu+mu- and Bd-->mu+mu- decays in ppbar collisions at sqrt(s) = 1.96TeV using 2fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron Collider. The observed number of Bs and Bd candidates is consistent with background expectations. The resulting upper limits on the branching fractions are B(Bs-->mu+mu-) < 5.8X10^-8 and B(Bd-->mu+mu-) < 1.8X10^-8 at 95% C.L.