Measurement of tt̅ spin correlation in pp̅ collisions using the CDF II detector at the Tevatron
Author(s)Bauer, Gerry P.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, Khaldoun; Paus, Christoph M. E.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical review D
American Physical Society
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
Final published version