$B^0_{(s)} \rightarrow \mu^+\mu^-$ at CMS

TL;DR

This paper reports on the CMS experiment's search for rare B meson decays into muon pairs, measuring their branching fractions and setting upper limits, consistent with Standard Model predictions, using data from 2011 and 2012.

Contribution

First measurement of B0_s to mu+mu- decay branching fraction at CMS, with combined results and future prospects discussed.

Findings

Measured B0_s to mu+mu- branching fraction: (3.0 +1.0 -0.9) x 10^-9

Set upper limit on B0 to mu+mu- decay: < 1.1 x 10^-9 at 95% CL

Combined results with LHCb improve sensitivity for rare decay searches

Abstract

The search for the rare \BMuMu and \BsMuMu decays in pp collisions at $\sqrt s = 7$~GeV and $\sqrt s = 8$~GeV, collected at the LHC in 2011 and 2012, is briefly reviewed. The data analyzed by CMS correspond to a total integrated luminosity of 5 and 20 $\rm fb^{-1}$, respectively. The time-integrated average branching fraction $\left<{\mathcal B }( { B^{0}_{s}\rightarrow \mu^+\mu^-} )\right>$ has been measured to be $(3.0 ^{+1.0}_{-0.9})\times 10^{-9}$ in accordance with the Standard Model predictions, while an upper limit $\left<{ \mathcal B }( B^{0}\rightarrow \mu^+\mu^-)\right> < 1.1\times 10^{-9}) $ has been placed on the other investigated decay at 95% CL. A preliminary combination with the results from LHCb is also presented for both channels, and prospects for the future are briefly discussed.