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S. and Warchol, J. and Watts, G. and Wayne, M. and Weber, M. and Welty-Rieger, L. and White, A. and Wicke, D. and Williams, M. R. J. and Wilson, G. W. and Wobisch, M. and Wood, D. R. and Wyatt, T. R. and Xie, Y. and Xu, C. and Yacoob, S. and Yamada, R. and Yang, W. -C. and Yasuda, T. and Yatsunenko, Y. A. and Ye, Z. and Yin, H. and Yip, K. and Youn, S. W. and Yu, J. and Zelitch, S. and Zhao, T. and Zhou, B. and Zhu, J. and Zielinski, M. and Zieminska, D. and Zivkovic, L. (2011) Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb(-1) of p(p)over-bar collisions. Physical Review D, 84 (5): 052007. -. ISSN 1550-7998
Abstract
We present an updated measurement of the anomalous like-sign dimuon charge asymmetry A(sl)(b) for semileptonic b-hadron decays in 9.0 fb(-1) of p (p) over bar collisions recorded with the D0 detector at a center-of-mass energy of root s = 1.96 TeV at the Fermilab Tevatron collider. We obtain A(sl)(b) = (-0.787 +/- 0.172(stat) +/- 0.093(syst)%. This result differs by 3.9 standard deviations from the prediction of the standard model and provides evidence for anomalously large CP violation in semileptonic neutral B decay. The dependence of the asymmetry on the muon impact parameter is consistent with the hypothesis that it originates from semileptonic b-hadron decays.