Measurement of ttbar Spin Correlation in ppbar Collisions Using the CDF II Detector at the Tevatron

Details Measurement of ttbar Spin Correlation in ppbar Collisions Using the CDF II Detector at the Tevatron Measurement of ttbar Spin Correlation in ppbar Collisions Using the CDF II Detector at the Tevatron

2010-12-14

arxiv.org/abs/1012.3093v2

Phys.Rev.D83:031104,2011

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevD.83.031104

The ttbar 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 ttbar spin state in ppbar collisions at sqrt(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 kappa = 0.60 +/- 0.50 (stat) +/- 0.16 (syst), consistent with the QCD prediction, kappa ~= 0.40.

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