Abazov, V. M. and Abbott, B. and Abolins, M. and Acharya, B. S. and Adams, M. and Adams, T. and Aguilo, E. and Alexeev, G. D. and Alkhazov, G. and Alton, A. and Alverson, G. and Alves, G. A. and Ancu, L. S. and Aoki, M. and Arnoud, Y. and Arov, M. and Askew, A. and Asman, B. and Atramentov, O. and Avila, C. and BackusMayes, J. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D. V. and Banerjee, S. and Barberis, E. and Barfuss, A. -F. and Baringer, P. and Barreto, J. and Bartlett, J. F. and Bassler, U. and Beale, S. and Bean, A. and Begalli, M. and Begel, M. and Belanger-Champagne, C. and Bellantoni, L. and Benitez, J. A. and Beri, S. B. and Bernardi, G. and Bertram, I. and Borissov, G. and Davies, G. and Fox, H. and Johnson, M. and Love, P. and Price, D. and Sopczak, A. and Williams, Mark (2010) Evidence for an anomalous like-sign dimuon charge asymmetry. Physical Review D, 82 (3): 032001. ISSN 1550-7998
Abstract
We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb(-1) of p (p) over bar collisions recorded with the D0 detector at a center-of-mass energy root s = 1.96 TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A(sl)(b) = -0.00957 +/- 0.00251 (stat) +/- 0.00146 (syst). This result differs by 3.2 standard deviations from the standard model prediction A(sl)(b)(SM) = (-2.3(0.6)(+0.5)) x 10(-4) and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.