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    Rights statement: © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

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

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  • D0 Collaboration
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<mark>Journal publication date</mark>10/06/2016
<mark>Journal</mark>Physics Letters B
Volume757
Number of pages8
Pages (from-to)199-206
<mark>State</mark>Published
Early online date25/03/16
<mark>Original language</mark>English

Abstract

Abstract 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, O off = 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.

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© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.