Počet záznamů: 1

Evidence for an anomalous like-sign dimuon charge asymmetry

  1. 1.
    0365648 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    Abazov, V. M. - Abbott, B. - Abolins, M. - Kupčo, Alexander - Lokajíček, Miloš
    Evidence for an anomalous like-sign dimuon charge asymmetry.
    Physical Review Letters. Roč. 105, č. 8 (2010), "081801-1"-"081801-7" ISSN 0031-9007
    Grant CEP: GA MŠk LA08047; GA MŠk LC527
    Výzkumný záměr: CEZ:AV0Z10100502
    Klíčová slova: D0 * Fermilab * hadron * dimuon * meson * collision
    Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
    Impakt faktor: 7.621, rok: 2010
    http://link.aps.org/doi/10.1103/PhysRevLett.105.081801

    We measure the charge asymmetry A =(N(++) -N(--))/(N(++) + N(--)) of like-sign dimuon events in 6.1 fb(-1) of p (p) over bar collisions recorded with the D0 detector at a center-of-mass energy root s = 1: 96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A(sl)(b) = -0.009 57 +/- 0.00251(stat) +/- 0.001 46(sys). It differs by 3.2 standard deviations from the standard model prediction A(sl)(b)(SM) = (-2.3(-0.6)(+0.5)) x 10(-4), and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.
    Trvalý link: http://hdl.handle.net/11104/0200839