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Type: Journal article
Title: Measurement of top quark polarization in top-antitop events from proton-proton collisions at √(s) = 7 TeV using the ATLAS detector
Other Titles: Measurement of top quark polarization in top-antitop events from proton-proton collisions at root(s) = 7 TeV using the ATLAS detector
Author: Aad, G.
Abajyan, T.
Abbott, B.
Abdallah, J.
Abdel Khalek, S.
Abdinov, O.
Aben, R.
Abi, B.
Abolins, M.
AbouZeid, O.S.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.S.
Adamczyk, L.
Adams, D.L.
Addy, T.N.
Adelman, J.
Adomeit, S.
Adye, T.
et al.
Citation: Physical Review Letters, 2013; 111(23):232001-1-232001-19
Publisher: American Physical Society
Issue Date: 2013
ISSN: 0031-9007
Statement of
G. Aad … P. Jackson … N. Soni … M. J. White … et al. (ATLAS collaboration)
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.
Keywords: ATLAS Collaboration
Rights: © 2013 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
DOI: 10.1103/PhysRevLett.111.232002
Appears in Collections:Aurora harvest 7
Physics publications

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