Abstract
We present a measurement of the like-sign dimuon asymmetry in semileptonic b-hadron decays, performed using 6.1 fb −1 of p p ¯ collisions recorded with the D0 detector at a center-of-mass energy s = 1.96 TeV at the Fermilab Tevatron collider. This measured value is A s l b = [ − 0.957 ± 0.251 (stat) ± 0.146 (syst) ] % , which disagrees with the Standard Model prediction at a statistical level of 3.2 σ , and provides the first evidence of anomalous CP violation in the mixing of neutral B mesons.
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