0380020 - FZÚ 2013 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 409 authors
Evidence for spin correlation in ttˉ production.
Physical Review Letters. Roč. 108, č. 3 (2012), "032004-1"-"032004-7". ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LA08047
Institutional research plan: CEZ:AV0Z10100502
Keywords : Batavia TEVATRON Coll * correlation dilepton * pair production * final state * D0 * anti-p p interaction
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 7.943, year: 2012
http://prl.aps.org/abstract/PRL/v108/i3/e032004

We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets. We analyze ppbar collisions data corresponding to an integrated luminosity of 5.3 fb^-1 collected with the D0 detector at the Fermilab Tevatron collider operating at a center of mass energy s√=1.96 TeV. Combining this result with a recent measurement of f in dilepton final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in ttbar events with a significance of more than three standard deviations.
Permanent Link: http://hdl.handle.net/11104/0210850