Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at √s = 7 TeV using the ATLAS detector
Author(s)Taylor, Frank E.
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A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and [bar over t] quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6 fb[superscript −1] at a center-of-mass energy of √s = 7 TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ[subscript 1] and θ[subscript 2] between the charged leptons and the direction of motion of the parent quarks in the t[bar over t] rest frame are sensitive to the spin information, and the distribution of cosθ[subscript 1]⋅cosθ[subscript 2] is sensitive to the spin correlation between the t and [bar over t] quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review D
American Physical Society
Aad, G., B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O. S. AbouZeid, et al. “Measurement of the Correlation Between the Polar Angles of Leptons from Top Quark Decays in the Helicity Basis at √s = 7 TeV Using the ATLAS Detector.” Phys. Rev. D 93, no. 1 (January 13, 2016). © 2016 CERN, for the ATLAS Collaboration
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