Počet záznamů: 1

Measurement of spin correlation in ttbar production using a matrix element approach

  1. 1.
    0367818 - 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 spin correlation in ttbar production using a matrix element approach.
    Physical Review Letters. Roč. 107, č. 3 (2011), "032001-1"-"032001-7" ISSN 0031-9007
    Grant CEP: GA MŠk LA08047
    Výzkumný záměr: CEZ:AV0Z10100502
    Klíčová slova: D0 * Tevatron * dilepton * anti-p p * spin
    Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
    Impakt faktor: 7.370, rok: 2011

    We determine the fraction of t (t) over bar events with spin correlation, assuming that the spin of the top quark is either correlated with the spin of the top antiquark as predicted by the standard model or is uncorrelated. For the first time we use a matrix-element-based approach to study t (t) over bar spin correlation. We use t (t) over bar -> W(+)bW(-)(b) over bar -> l(+)nu bl(-)(nu) over bar(b) over bar final states produced in p (p) over bar collisions at a center- of- mass energy root s = 1: 96 TeV, where l denotes an electron or a muon. The data correspond to an integrated luminosity of 5: 4 fb(-1) and were collected with the D0 detector at the Fermilab Tevatron collider. The result agrees with the standard model prediction. We exclude the hypothesis that the spins of the t (t) over bar are uncorrelated at the 97.7% C.L.
    Trvalý link: http://hdl.handle.net/11104/0202365