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Measurement of spin correlation between top and antitop quarks produced in p(p)over-bar collisions at root s=1.96 TeV
Joint Inst Nucl Res, Dubna, Russia..
Univ Oklahoma, Norman, OK 73019 USA..
Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India..
Univ Illinois, Chicago, IL 60607 USA..
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2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, 199-206 p.Article in journal (Refereed) Published
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Abstract [en]

We present a measurement of the correlation between the spins of t and (t) over bar 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 DO 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.

Place, publisher, year, edition, pages
2016. Vol. 757, 199-206 p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-298841DOI: 10.1016/j.physletb.2016.03.053ISI: 000376800300025OAI: oai:DiVA.org:uu-298841DiVA: diva2:948358
Funder
German Research Foundation (DFG)Swedish Research Council
Available from: 2016-07-11 Created: 2016-07-11 Last updated: 2017-11-28Bibliographically approved

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High Energy Physics
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Physics Letters B
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