Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at √s = 7 TeV Using the ATLAS Detector
Name
Aad-2013-Measurement of Top Q.pdf
Size
528.67 KB
Format
Adobe PDF
Checksum (MD5)
5cdbfb6b1d89ba47c90f255d93281f90
Author(s)
Taylor, Frank E.
Date Issued
December 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, 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, no. 23 (December 2013). © 2013 CERN, for the ATLAS Collaboration
Version
Final published version
Abstract
This Letter presents measurements of the polarization of the top quark in top-antitop quark pair events, using 4.7 fb[superscript −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 α[subscript ℓ]P, 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, α[subscript ℓ]P[subscript CPC] = −0.035 ± 0.014(stat) ± 0.037(syst) and α[subscript ℓ]P[subscript CPV] = 0.020 ± 0.016(stat) [+ 0.013 over −0.017](syst), are in good agreement with the standard model prediction of negligible top quark polarization.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.232002
