Abstract: Results are presented from a search for the rare decays Bs0??+?- and B0??+? - in pp collisions at ?s=7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb-1, respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction B(Bs0??+?-)=(3.0-0.9+1.0) ×10-9, where the uncertainty includes both statistical and systematic contributions. An excess of Bs0??+?- events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B0??+?- an upper limit of B(B0??+?-)<1.1×10 -9 at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model.

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