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

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Phys.Rev.D83:031104,2011

OSTI ID:1007273

Aaltonen, T; Adelman, J; Alvarez Gonzalez, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Apresyan, A; Arisawa, T

The t{bar t} 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{bar t} spin state in p{bar p} collisions at {radical}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{sup 2}, we find a spin correlation coefficient {kappa} = 0.60 {+-} 0.50 (stat) {+-} 0.16 (syst), consistent with the QCD prediction, {kappa} {approx} 0.40.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1007273
• Report Number(s): FERMILAB-PUB-10-513-E; PRVDAQ; arXiv eprint number arXiv:1012.3093; TRN: US1101304
• Journal Information: Phys.Rev.D83:031104,2011, Vol. 83; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
FORECASTING
HELICITY
LEPTONS
PHYSICS
PRODUCTION
QUANTUM CHROMODYNAMICS
SPIN
T QUARKS
Experiment-HEP