Measurement of theCPAsymmetry inB+→K+μ+μ−Decays

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle (+647 others)
2013 Physical Review Letters  
A measurement of the C 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 centre-of-mass energy of 7 TeV. The measurement is performed in seven bins of μ^+ μ^- invariant mass squared in the range 0.05<q^2<22.00GeV^2/c^4, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B^+ → J/ψ K^+ decay as a control
more » ... . Averaged over all the bins, the C asymmetry is found to be A_C = 0.000± 0.033(stat.)±0.005 (syst.)± 0.007(J/ψ K^+), where the third uncertainty is due to the C asymmetry of the control mode. This is consistent with the Standard Model prediction.
doi:10.1103/physrevlett.111.151801 pmid:24160590 fatcat:yfdkkqo3tzboxiw25yite5lvdi