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Measurement of the B0s→μ+μ− branching fraction and search for B0→μ+μ− decays at the LHCb experiment
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Measurement of the B0s→μ+μ− branching fraction and search for B0→μ+μ− decays at the LHCb experiment. Physical Review Letters, Volume 111 (Number 10). Article number 101805. doi:10.1103/PhysRevLett.111.101805
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WRAP_LHCb_PhysRevLett.111.101805.pdf - Published Version Available under License Creative Commons Attribution. Download (474Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.111.101805
Abstract
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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