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We present an updated measurement of the anomalous like-sign dimuon chargeasymmetry Aslb for semi-leptonic $b$-hadron decays in 9.0 fb^-1 of p pbarcollisions 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 deviationsfrom the prediction of the standard model and provides evidence for anomalouslylarge CP violation in semi-leptonic neutral B decay. The dependence of theasymmetry on the muon impact parameter is consistent with the hypothesis thatit originates from semi-leptonic b-hadron decays.

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