Measurement of spin correlation in t(t)over-bar production using dilepton final states
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Data
2011-08-03
Autores
Abazov, V. M.
Abbott, B.
Acharya, B. S.
Adams, M.
Adams, T.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Alverson, G.
Alves, G. A.
Título da Revista
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Editor
Elsevier B.V.
Resumo
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. (C) 2011 Elsevier B.V. All rights reserved.
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Palavras-chave
Top quark, Spin, QCD
Como citar
Physics Letters B. Amsterdam: Elsevier B.V., v. 702, n. 1, p. 16-23, 2011.