Evidence for an anomalous like-sign dimuon charge asymmetry

V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, E. Aguilo, G. D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G. A. Alves (+437 others)
2010 Physical Review D  
We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb^-1 of pp̅ collisions recorded with the D0 detector at a center-of-mass energy √(s) = 1.96 TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: = -0.00957 ± 0.00251 ( stat) ± 0.00146 ( syst). This result differs by 3.2 standard deviations from the standard model prediction (SM) = (-2.3^+0.5_-0.6) × 10^-4 and provides first evidence of anomalous CP-violation in the mixing of neutral B mesons.
doi:10.1103/physrevd.82.032001 fatcat:5ix47f6m2bdypmui35dnistzze