Measurement of tt̅ spin correlation in pp̅ collisions using the CDF II detector at the Tevatron
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Aaltonen-2011-Measurement of t(t)o.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Makhoul, Khaldoun
Paus, Christoph M. E.
Bauer, Gerry P
Date Issued
February 2011
Journal
Physical review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Measurement of tt[over ¯] spin correlation in pp[over ¯] collisions using the CDF II detector at the Tevatron.” Physical Review D 83.3 (2011) : n. pag. © 2011 American Physical Society
Version
Final published version
Abstract
The tt̅ spin correlation at production is a fundamental prediction of QCD and a potentially incisive test of new physics coupled to top quarks. We measure the tt̅ spin state in pp̅ collisions at √s=1.96 [square root of s=1.96] TeV using 1001 candidate events in the lepton plus jets decay channel reconstructed in the CDF II detector. In the helicity basis, for a top-quark mass of 172.5 GeV/c2 GeV/c superscript 2], we find a spin correlation coefficient κ=0.60±0.50 (stat)±0.16 (syst), consistent with the QCD prediction, κ≈0.40.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.83.031104
