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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/30542

Title: Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at s√=7  TeV Using the ATLAS Detector
Authors: Aad, G.
Aguilar-Saavedra, Juan Antonio
Atlas Collaboration
Issue Date: 2013
Abstract: 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 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)+0.013−0.017(syst), are in good agreement with the standard model prediction of negligible top quark polarization.
Publisher: American Physical Society
Keywords: Top quark
Atlas detector
Proton collisions
URI: http://hdl.handle.net/10481/30542
ISSN: 0031-9007
1079-7114
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Aad, G.; et al. Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at s√=7  TeV Using the ATLAS Detector. Physical Review Letters, 111: 232002 (2013). [http://hdl.handle.net/10481/30542]
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