Measurement of spin correlation between top and antitop quarks produced in pp¯ collisions at √s = 1.96 TeV

0470482 - FZÚ 2017 RIV NL eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš - Royon, C. … Total 372 authors
Measurement of spin correlation between top and antitop quarks produced in pp¯ collisions at √s = 1.96 TeV.
Physics Letters. B. Roč. 757, Jun (2016), s. 199-206. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT(CZ) LG15047; GA MŠMT LM2015068
Institutional support: RVO:68378271
Keywords : Batavia TEVATRON Coll * final state: ((n)jet dilepton) * final state: ((n)jet lepton) * data analysis method * experimental results * 1960 GeV-cms
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.807, year: 2016

We present a measurement of the correlation between the spins of t and t¯ quarks produced in proton–antiproton collisions at the Tevatron Collider at a center-of-mass energy of 1.96 TeV. We apply a matrix element technique to dilepton and single-lepton+jets final states in data accumulated with the D0 detector that correspond to an integrated luminosity of 9.7 fb−1 . The measured value of the correlation coefficient in the off-diagonal basis, Ooff=0.89±0.22(stat+syst) , is in agreement with the standard model prediction, and represents evidence for a top–antitop quark spin correlation difference from zero at a level of 4.2 standard deviations.

Permanent Link: http://hdl.handle.net/11104/0268107