Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb.sup.-1./sup. of p pbar collisions

0367905 - FZÚ 2013 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 420 authors
Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb^-1 of p pbar collisions.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 84, č. 5 (2011), "052007-1"-"052007-24". ISSN 1550-7998
R&D Projects: GA MŠMT LA08047
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 * Tevatron * dimuon * asymmetry
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.558, year: 2011
http://link.aps.org/doi/10.1103/PhysRevD.84.052007

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 sqrt{s} = 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.
Permanent Link: http://hdl.handle.net/11104/0202415