Rights statement: © 2010 The American Physical Society
Final published version, 1.3 MB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 032001 |
---|---|
<mark>Journal publication date</mark> | 16/08/2010 |
<mark>Journal</mark> | Physical Review D |
Issue number | 3 |
Volume | 82 |
Number of pages | 30 |
Publication Status | Published |
<mark>Original language</mark> | English |
We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb(-1) of p (p) over bar collisions recorded with the D0 detector at a center-of-mass energy root s = 1.96 TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A(sl)(b) = -0.00957 +/- 0.00251 (stat) +/- 0.00146 (syst). This result differs by 3.2 standard deviations from the standard model prediction A(sl)(b)(SM) = (-2.3(0.6)(+0.5)) x 10(-4) and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.