# Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb^-1 of p pbar collisions

Abstract : We present an updated measurement of the anomalous like-sign dimuon charge asymmetry Aslb for semi-leptonic $b$-hadron decays in 9.0 fb^-1 of p pbar collisions recorded with the D0 detector at a center-of-mass energy of sqrt{s} = 1.96 TeV at the Fermilab Tevatron collider. We obtain Aslb = (-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 semi-leptonic neutral B decay. The dependence of the asymmetry on the muon impact parameter is consistent with the hypothesis that it originates from semi-leptonic b-hadron decays.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00605336
Contributor : Swarna Bassava <>
Submitted on : Friday, July 1, 2011 - 11:28:04 AM
Last modification on : Thursday, November 19, 2020 - 12:58:27 PM

### Citation

V. Abazov, G. Bernardi, D. Brown, J. Brown, Y. Enari, et al.. Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb^-1 of p pbar collisions. Physical Review D, American Physical Society, 2011, 84, pp.052007. ⟨10.1103/PhysRevD.84.052007⟩. ⟨in2p3-00605336⟩

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