Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at $\sqrt{s}$ = 7 TeV Using the ATLAS Detector

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2013) Physical Review Letters — Vol. 111 (2013)

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This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7  fb-1 of proton-proton collision data marc:recorded with the ATLAS detector at the Large Hadron Collider at s=7  TeV. Final states containing one or two isolated leptons (electrons or muons) and jets are considered. Two measurements of αℓP, the product of the leptonic spin-analyzing power and the top quark polarization, are performed assuming that the polarization is introduced by either a CP conserving or a maximally CP violating production process. The measurements obtained, αℓPCPC=-0.035±0.014(stat)±0.037(syst) and αℓPCPV=0.020±0.016(stat)-0.017+0.013(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
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Tanasijczuk, A. J., ATLAS, & et al. (2013). Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at $\sqrt{s}$ = 7 TeV Using the ATLAS Detector. Physical Review Letters, 111. https://doi.org/10.1103/PhysRevLett.111.232002 (Original work published 2013)