A search for the rare decays Bs0→μ +μ - and B0→μ +μ - is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1 fb -1 of pp collisions at a center-of-mass energy of 7 TeV and 2 fb -1 at 8 TeV. An excess of Bs0→μ +μ - signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of B(Bs0→μ +μ -)=(2.9-1.0+1.1)×10 -9 is obtained and an upper limit of B(B0→μ +μ -)<7.4×10 -10 at 95% confidence level is set. These results are consistent with the standard model expectations.
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)