Počet záznamů: 1

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

  1. 1.
    0367905 - FZU-D 2013 RIV US eng J - Článek v odborném periodiku
    Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš
    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
    Grant CEP: GA MŠk LA08047
    Výzkumný záměr: CEZ:AV0Z10100502
    Klíčová slova: D0 * Tevatron * dimuon * asymmetry
    Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
    Impakt faktor: 4.558, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0202415