Study of CP Asymmetry in B[superscript 0]−[bar over B][superscript 0] Mixing with Inclusive Dilepton Events
J. P. Lees, Vincent Poireau, V. Tisserand, E. Graugés, ANTIMO PALANO, G. Eigen, B. Stugu, D. N. Brown, Leroy T. Kerth, Yu. G. Kolomensky, M. J. Lee, G. Lynch, H Koch, Tamara Vazquez Schroeder, Christopher Hearty, T. S. Mattison, J. A. McKenna, R. Y. So, Asad Ali Khan, V. E. Blinov · DSpace@MIT (Massachusetts Institute of Technology) · 2015
We present a measurement of the asymmetry A[subscript CP] between same-sign inclusive dilepton samples ℓ[superscript +]ℓ[superscript +] and ℓ[superscript −]ℓ[superscript −] (ℓ=e, μ) from semileptonic B decays in Υ(4S)→B[bar over B] events, using the complete data set recorded by the BABAR experiment near the Υ(4S) resonance, corresponding to 471×10[superscript 6] B[bar over B] pairs. The asymmetry A[subscript CP] allows comparison between the mixing probabilities P([bar over B][superscript 0]→B[superscript 0]) and P(B[superscript 0]→[bar over B][superscript 0]), and therefore probes CP and T violation. The result, A[subscript CP]=[−3.9±3.5(stat)±1.9(syst)]×10[superscript −3], is consistent with the standard model expectation.