Počet záznamů: 1

Determination of the width of the top quark

  1. 1.
    0367641 - FZU-D 2013 RIV US eng J - Článek v odborném periodiku
    Abazov, V. M. - Abbott, B. - Abolins, M. - Kupčo, Alexander - Lokajíček, Miloš
    Determination of the width of the top quark.
    Physical Review Letters. Roč. 107, č. 2 (2011), "022001-1"-"022001-7" ISSN 0031-9007
    Grant CEP: GA MŠk LA08047
    Výzkumný záměr: CEZ:AV0Z10100502
    Klíčová slova: D0 * top quark
    Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
    Impakt faktor: 7.370, rok: 2011

    We extract the total width of the top quark, Gamma(t), from the partial decay width Gamma(t -> Wb) measured using the t-channel cross section for single top-quark production and from the branching fraction B(t -> Wb) measured in t (t) over bar t events using up to 2.3 fb(-1) of integrated luminosity collected by the D0 Collaboration at the Tevatron p (p) over bar Collider. The result is Gamma(t) = 1.99(-0.55)(+0.69) GeV, which translates to a top-quark lifetime of tau(t) = (3.3-(+1.3)(0.9)) x 10(-25) s. Assuming a high mass fourth generation b´ quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on vertical bar V(tb´)vertical bar < 0.63 at 95% C.L.
    Trvalý link: http://hdl.handle.net/11104/0202237