Measurement of the CP Asymmetry in B[superscript +] → K[superscript +]μ[superscript +]μ[superscript -] Decays
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A measurement of the CP asymmetry in B[superscript +] → K[superscript +]μ[superscript +]μ[superscript −] decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb[superscript −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[superscript +]μ[superscript −] invariant mass squared in the range 0.05 < q[superscript 2] < 22.00 GeV[superscript 2]/c[superscript 4], excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B[superscript +] → J/ψK[superscript +] 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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Measurement of the CP Asymmetry in B[superscript +] → K[superscript +]μ[superscript +]μ[superscript -] Decays.” Physical Review Letters 111, no. 15 (October 2013). © 2013 CERN, for the LHCb Collaboration
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