Measurement of spin correlation between top and antitop quarks produced in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV

Abstract : We present a measurement of the correlation between the spins of t and tbar 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, $O_{off} = 0.89 \pm 0.22$ (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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Physics Letters B, Elsevier, 2016, 757, pp.199-206. 〈10.1016/j.physletb.2016.03.053〉
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http://hal.in2p3.fr/in2p3-01249891
Contributeur : Emmanuelle Vernay <>
Soumis le : lundi 4 janvier 2016 - 08:46:23
Dernière modification le : mardi 22 mai 2018 - 21:48:10

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V.M. Abazov, G. Sajot, J. Stark, S. Greder, F. Miconi, et al.. Measurement of spin correlation between top and antitop quarks produced in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV. Physics Letters B, Elsevier, 2016, 757, pp.199-206. 〈10.1016/j.physletb.2016.03.053〉. 〈in2p3-01249891〉

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