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Measurement of top quark polarization in top-antitop events from proton-proton collisions at √s=7 TeV using the ATLAS detector

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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 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)...

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Main Authors: Aad, Georges (Author) , Anders, Christoph (Author) , Anders, Gerrit (Author) , Andrei, George Victor (Author) , Colombo, Tommaso (Author) , Davygora, Yuriy (Author) , Dietzsch, Thorsten (Author) , Dunford, Monica (Author) , Hanke, Paul (Author) , Djuvsland, Julia Isabell (Author) , Kasieczka, Gregor (Author) , Khomich, Andrei (Author) , Kluge, Eike-Erik (Author) , Kugel, Andreas (Author) , Laier, Heiko (Author) , Lang, Valerie (Author) , Lendermann, Victor (Author) , Meier, Karlheinz (Author) , Müller, Felix (Author) , Narayan, Rohin T. (Author) , Poddar, Sahill (Author) , Schätzel, Sebastian (Author) , Scharf, Veit (Author) , Schmitt, Stefan (Author) , Schöning, André (Author) , Schroer, Nicolai (Author) , Schultz-Coulon, Hans-Christian (Author) , Stamen, Rainer (Author) , Wessels, Martin (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 4 December 2013
In: Physical review letters
Year: 2013, Volume: 111, Issue: 23, Pages: 1-19
ISSN:1079-7114
DOI:10.1103/PhysRevLett.111.232002
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.111.232002
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.111.232002
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Author Notes:G. Aad et al. (ATLAS Collaboration)
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Summary: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.
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Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.111.232002

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