The t (t) over bar 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 t (t) over bar spin state in p (p) over bar collisions at root 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/c(2), we find a spin correlation coefficient k = 0.60 +/- 0.50 (stat) +/- 0.16 (syst), consistent with the QCD prediction, k approximate to 0.40.
Measurement of t(t)over-bar spin correlation in p(p)over-bar collisions using the CDF II detector at the Tevatron
CIOCCI, MARIA AGNESE;DONATI, SIMONE;PUNZI, GIOVANNI;F. Ruffini;
2011-01-01
Abstract
The t (t) over bar 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 t (t) over bar spin state in p (p) over bar collisions at root 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/c(2), we find a spin correlation coefficient k = 0.60 +/- 0.50 (stat) +/- 0.16 (syst), consistent with the QCD prediction, k approximate to 0.40.File in questo prodotto:
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