Rights statement: © 2011 American Physical Society
Final published version, 1.07 MB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 052007 |
---|---|
<mark>Journal publication date</mark> | 16/09/2011 |
<mark>Journal</mark> | Physical Review D |
Issue number | 5 |
Volume | 84 |
Number of pages | 24 |
Pages (from-to) | - |
Publication Status | Published |
<mark>Original language</mark> | English |
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.