Evidence for an anomalous like-sign dimuon charge asymmetry
Abstract
We measure the charge asymmetry A of like-sign dimuon events in 6.1fb-1 of pp¯ collisions recorded with the D0 detector at a center-of-mass energy s=1.96TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: Aslb=-0.00957±0.00251(stat)±0.00146(syst). This result differs by 3.2 standard deviations from the standard model prediction Aslb(SM)=(-2.3-0.6+0.5)×10-4 and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.
- Publication:
-
Physical Review D
- Pub Date:
- August 2010
- DOI:
- 10.1103/PhysRevD.82.032001
- arXiv:
- arXiv:1005.2757
- Bibcode:
- 2010PhRvD..82c2001A
- Keywords:
-
- 13.25.Hw;
- 11.30.Er;
- 14.40.Nd;
- Decays of bottom mesons;
- Charge conjugation parity time reversal and other discrete symmetries;
- Bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- Submitted to Phys. Rev. D