Measurement of spin correlation in t(t)over-bar production using dilepton final states
2011 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 702, no 1, 16-23 p.Article in journal (Refereed) Published
We measure the correlation between the spin of the top quark and the spin of the anti-top quark in t (t) over bar -> W(+)bW(-)(b) over bar -> l(+)vbl(-) (v) 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 is an electron or 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 correlation is extracted from the angles of the two leptons in the t and (t) over bar rest frames, yielding a correlation strength C = 0.10(-0.45)(+0.45). in agreement with the NLO QCD prediction within two standard deviations, but also in agreement with the no correlation hypothesis.
Place, publisher, year, edition, pages
2011. Vol. 702, no 1, 16-23 p.
Top quark, Spin, QCD
IdentifiersURN: urn:nbn:se:uu:diva-158597DOI: 10.1016/j.physletb.2011.05.077ISI: 000294142600004OAI: oai:DiVA.org:uu-158597DiVA: diva2:440270