Search for the rare decays Bs,d->mumu at LHCb

A search for the Bs->mumu and Bd->mumu decays is presented using ~300 pb-1 of pp collisions at sqrt{s} = 7 TeV collected by the LHCb experiment at the Large Hadron Collider at CERN. The measured upper limit for the branching ratio of the Bs->mumu decay is BR(Bsmumu) < 1.3 (1.6) x 10^{-8} at 90% (95%) confidence level (CL), while in the case of the Bd->mumu decay the measured upper limit is BR(Bdmumu) < 4.2 (5.1) x 10^{-9} at 90% (95%) CL. A combination with the 2010 dataset results in BR(Bsmumu) < 1.2 (1.5) x 10^{-8} at 90% (95%) CL.

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