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

TL;DR

The observed number of B(s)(0) and B0 candidates is consistent with background expectations and the resulting upper limits on the branching fractions are B(B(s)0) --> micro(+) micro(-)) <5.8 x 10(-8) and Fermilab Tevatron Collider, 95% C.L.

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.

Figures (2)

• Figure 1: Distributions of $\nu_{N}$ for simulated $B_s^0\rightarrow\mu^{+}\mu^{-}$ signal and observed sideband events.
• Figure 2: The $\mu^{+}\mu^{-}$ invariant mass distribution for events satisfying all selection criteria for the final three ranges of $\nu_{N}$.