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

Abazov, V.M. and Abbott, B. and Acharya, B.S. and Adams, M. and Adams, T. and Agnew, J.P. and Alexeev, G.D. and Alkhazov, G. and Alton, A. and Askew, A. and Atkins, S. and Augsten, K. and Aushev, V. and Aushev, Y. and Avila, C. and Badaud, F. and Bagby, L. and Baldin, B. and Bandurin, D.V. and Banerjee, S. and Barberis, E. and Baringer, P. and Bartlett, J.F. and Bassler, U. and Bazterra, V. and Bean, A. and Begalli, M. and Bellantoni, L. and Beri, S.B. and Bernardi, G. and Bernhard, R. and Bertram, I. and Besançon, M. and Beuselinck, R. and Bhat, P.C. and Bhatia, S. and Bhatnagar, V. and Blazey, G. and Blessing, S. and Bloom, K. and Boehnlein, A. and Boline, D. and Boos, E.E. and Borissov, G. and Borysova, M. and Brandt, A. and Fox, H. and Ratoff, P.N. and Ross, A. and Williams, M.R.J. (2016) Measurement of spin correlation between top and antitop quarks produced in pp¯ collisions at √s = 1.96 TeV. Physics Letters B, 757. pp. 199-206. ISSN 0370-2693

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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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Journal Article
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Physics Letters B
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© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funded by SCOAP3.
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19 Apr 2016 13:10
Last Modified:
11 Aug 2020 05:00