Search for the Flavor-changing neutral current decay B_s⁰→µ⁺µ^- in pp̅ Collisions at √s=1.96 TeV with the D0 detector

Abstract

We present the results of a search for the flavor-changing neutral current decay B_s⁰→µ⁺µ^- using a data set with integrated luminosity of 240 pb⁻¹ of pp̅ collisions at √s=1.96 TeV collected with the D0 detector in run II of the Fermilab Tevatron collider. We find the upper limit on the branching fraction to be B(B_s⁰→µ⁺µ^-)≤5.0×10⁻⁷ at the 95% C.L. assuming no contributions from the decay B_d⁰→µ⁺µ^- in the signal region. This limit is the most stringent upper bound on the branching fraction B_s⁰→µ⁺µ^- to date.