Počet záznamů: 1

Measurement of the W boson helicity in top quark decays using 5.4 fb.sup.-1./sup. of ppbar collision data

  1. 1.
    0367578 - 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 W boson helicity in top quark decays using 5.4 fb-1 of ppbar collision data.
    Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 83, č. 3 (2011), "032009-1"-"032009-17" ISSN 1550-7998
    Grant CEP: GA MŠk LA08047
    Výzkumný záměr: CEZ:AV0Z10100502
    Klíčová slova: Tevatron * D0 * dilepton
    Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
    Impakt faktor: 4.558, rok: 2011

    We present a measurement of the helicity of the W boson produced in top quark decays using t (t) over bar decays in the l + jets and dilepton final states selected from a sample of 5.4 fb(-1) of collisions recorded using the D0 detector at the Fermilab Tevatron p (p) over bar collider. We measure the fractions of longitudinal and right-handed W bosons to be f(0) = 0.669 +/- 0.102[+/- 0.078(stat.) +/- 0.065(syst.) +/- and f(+) = 0.023 +/- 0.053[+/- 0.041(stat.) +/- 0.034(syst.)], respectively. This result is consistent at the 98% level with the standard model. A measurement with f(0) fixed to the value from the standard model yields f(+) = 0.010 +/- 0.037[+/- 0.022(stat.) +/- 0.030(syst.).].
    Trvalý link: http://hdl.handle.net/11104/0202204