CMS Collaboration, Adair, A., Akgun, B., et al.. "Measurement of the B0s→μ+μ− Branching Fraction and Search for B0→μ+μ− with the CMS Experiment." Physical Review Letters, 111, no. 10 (2013) 101804. http://dx.doi.org/10.1103/PhysRevLett.111.101804.
Results are presented from a search for the rare decays B0s→μ+μ− and B0→μ+μ− 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(B0s→μ+μ−)=(3.0+1.0−0.9)×10−9, where the uncertainty includes both statistical and systematic contributions. An excess of B0s→μ+μ− events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B0→μ+μ− an upper limit of B(B0→μ+μ−)<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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