Search for the rare decay $B_s^0\to {\mu }^{+}{\mu }^{-}$

Abstract

We present the results of a search for the flavor changing neutral current decay $B_s^0\to {\mu }^{+}{\mu }^{-}$ using $6.1{\text{fb}}^{-1}$ of $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{TeV}$ collected by the D0 experiment at the Fermilab Tevatron Collider. The observed number of $B_s^0$ candidates is consistent with background expectations. The resulting upper limit on the branching fraction is $\mathcal{B}(B_s^0\to {\mu }^{+}{\mu }^{-})<5.1\times {10}^{-8}$ at the 95% C.L. This limit is a factor of 2.4 better than that of the previous D0 analysis and the best limit to date.