2013/08/31 by LHCb collaboration, R. Aaij, B. Adeva +666 · 1 citation
Physics and Astronomy · #Algorithm #Astrophysics #Asymmetry #Citation #Computer science #High-Energy Particle Collisions Research #Library science #Luminosity #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.111.151801
published as Phys. Rev. Lett. 111, 151801 (2013) · 16 pages including author list, 2 figures
openalex publication_date 2013/10/07 · arxiv created 2013/10/10 · arxiv updated 2016/03/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A measurement of the CP asymmetry in B+\ensuremath→K+\ensuremathμ+\ensuremathμ^\ensuremath- decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb^\ensuremath-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 \ensuremathμ+\ensuremathμ^\ensuremath- invariant mass squared in the range 0.05<q2<22.00 GeV2/c4, excluding the J/\ensuremathψ and \ensuremathψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B+\ensuremath→J/\ensuremathψK+ decay as a control mode. Averaged over all the bins, the CP asymmetry is found to be ACP=0.000\ifmmode±\else\textpm\fi0.033 (stat)\ifmmode±\else\textpm\fi0.005 (syst)\ifmmode±\else\textpm\fi0.007 (J/\ensuremathψK), where the third uncertainty is due to the CP asymmetry of the control mode. This is consistent with the standard model prediction.