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Measurement of the CP asymmetry in B+→K+μ+μ− decays
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Pilar, T., Latham, Thomas, Poluektov, Anton, Reid, M. M., Wallace, Charlotte, Whitehead, M. (Mark), Williams, M. P. and Silva Coutinho, R.). (2013) Measurement of the CP asymmetry in B+→K+μ+μ− decays. Physical Review Letters, Volume 111 . Article Number 151801 . doi:10.1103/PhysRevD.84.092001
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WRAP_PhysRevLett.111.151801.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution. Download (481Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevLett.111.151801
Abstract
A measurement of the CP asymmetry in B+→K+μ+μ− decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb−1, recorded by the LHCb experiment during 2011 at a center-of-mass energy of 7 TeV. The measurement is performed in seven bins of μ+μ− invariant mass squared in the range 0.05<q2<22.00 GeV2/c4, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B+→J/ψK+ decay as a control mode. Averaged over all the bins, the CP asymmetry is found to be ACP=0.000±0.033 (stat)±0.005 (syst)±0.007 (J/ψK), where the third uncertainty is due to the CP asymmetry of the control mode. This is consistent with the standard model prediction.
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