Search for the X (5568) State Decaying into Bs0 ?± in Proton-Proton Collisions at s =8 TeV
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A search for resonancelike structures in the Bs0?± invariant mass spectrum is performed using proton-proton collision data collected by the CMS experiment at the LHC at s=8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The Bs0 mesons are reconstructed in the decay chain Bs0?J/??, with J/???+?- and ??K+K-. The Bs0?± invariant mass distribution shows no statistically significant peaks for different selection requirements on the reconstructed Bs0 and ?± candidates. Upper limits are set on the relative production rates of the X(5568) and Bs0 states times the branching fraction of the decay X(5568)±?Bs0?±. In addition, upper limits are obtained as a function of the mass and the natural width of possible exotic states decaying into Bs0?±. © 2018 CERN.