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

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

2011-06-30

arxiv.org/abs/1106.6308v1

Phys.Rev.D84:052007,2011

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.84.052007

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.

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