Measurement of spin correlation in ttbar production using dilepton final states

0367775 - FZÚ 2013 RIV NL eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 427 authors
Measurement of spin correlation in ttbar production using dilepton final states.
Physics Letters. B. Roč. 702, č. 1 (2011), 16-23. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT LA08047
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 * Tevatron * spin * lepton * QCD * top quark
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 3.955, year: 2011

We measure the correlation between the spin of the top quark and the spin of the anti-top quark in (ttbar -> W+ W- b bbar -> l+ nu b l- nubar bbar) final states produced in ppbar collisions at a center of mass energy sqrt(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 tbar 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
Permanent Link: http://hdl.handle.net/11104/0202329