2011/06/30 by D0 Collaboration, V. M. Abazov, V. Abazov +99 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevd.84.052007
published as Phys.Rev.D84:052007,2011 · Submitted to Phys. Rev. D
arxiv created 2011/06/30 · openalex publication_date 2011/09/16 · arxiv updated 2011/09/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
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 sqrts = 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.