Measurement of tt spin correlation in pp collisions using the CDF II detector at the Tevatron

Journal Article · Tue Feb 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.031104· OSTI ID:21504838

Aaltonen, T; Brucken, E; Devoto, F; Mehtala, P; Orava, R ^[1]; Alvarez Gonzalez, B; Casal, B; Cuevas, J; Gomez, G; Palencia, E; Rodrigo, T; Ruiz, A; Scodellaro, L; Vila, I; Vilar, R ^[2]; Amerio, S; Dorigo, T; Gresele, A; Lazzizzera, I ^[3]; Amidei, D ^[4]

---

1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
2. Instituto de Fisica de Cantabria, CSIC-University of Cantabria, 39005 Santander (Spain)
3. Istituto Nazionale di Fisica Nucleare, Sezione di Padova-Trento, I-35131 Padova (Italy)
4. University of Michigan, Ann Arbor, Michigan 48109 (United States)

The tt 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 tt spin state in pp 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_equal}0.40.

• OSTI ID: 21504838
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevD.83.031104; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CORRELATIONS
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
FORECASTING
HELICITY
LEPTONS
MASS
PARTICLE DECAY
PROTON-PROTON INTERACTIONS
QUANTUM CHROMODYNAMICS
SPIN
T QUARKS
TEV RANGE 01-10
ACCELERATORS
ANGULAR MOMENTUM
BARYON-BARYON INTERACTIONS
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
INTERACTIONS
MEASURING INSTRUMENTS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
QUANTUM FIELD THEORY
QUARKS
RADIATION DETECTORS
SYNCHROTRONS
TEV RANGE
TOP PARTICLES