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Measurement of Top Quark Polarization in Top-Antitop Events from Proton-Proton Collisions at root s=7 TeV Using the ATLAS Detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, no 23, 232002- p.Article in journal (Refereed) Published
Abstract [en]

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 root s = 7 TeV. Final states containing one or two isolated leptons ( electrons or muons) and jets are considered. Two measurements of alpha P-l, 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, alpha P-l(CPC) = -0: 035 +/- 0: 014(stat) +/- 0: 037(syst) and alpha P-l(CPV) = 0: 020 +/- 0: 016(stat)(-0.017)(+0.013)(syst), are in good agreement with the standard model prediction of negligible top quarkpolarization.

Place, publisher, year, edition, pages
2013. Vol. 111, no 23, 232002- p.
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Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-216785DOI: 10.1103/PhysRevLett.111.232002ISI: 000328616300013OAI: oai:DiVA.org:uu-216785DiVA: diva2:690766
Note

ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.111.232002.

Available from: 2014-01-24 Created: 2014-01-24 Last updated: 2017-12-06Bibliographically approved

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Brenner, RichardBuszello, Claus PConiavitis, EliasEkelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderPelikan, Daniel

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