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Observation of spin correlation in tt [bar] events from pp collisions at √s=7  TeV using the ATLAS detector

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A measurement of spin correlation in t¯t production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb−1. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The diffe...

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Main Authors: Aad, Georges (Author) , Anders, Gabriel (Author) , Andrei, George Victor (Author) , Davygora, Yuriy (Author) , Dietzsch, Thorsten (Author) , Geweniger, Christoph (Author) , Hanke, Paul (Author) , Henke, Michael (Author) , Khomich, Andrei (Author) , Kluge, Eike-Erik (Author) , Kugel, Andreas (Author) , Männer, Reinhard (Author) , Meier, Karlheinz (Author) , Müller, Felix (Author) , Poddar, Sahill (Author) , Schätzel, Sebastian (Author) , Scharf, Veit (Author) , Schöning, André (Author) , Schmitt, Sebastian (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: 24 May 2012
In: Physical review letters
Year: 2012, Volume: 108, Issue: 21
ISSN:1079-7114
DOI:10.1103/PhysRevLett.108.212001
Online Access:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.108.212001
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.108.212001
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Author Notes:G. Aad et al.* (ATLAS Collaboration)
Description
Summary:A measurement of spin correlation in t¯t production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1 fb−1. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons in the laboratory frame is used to extract the correlation between the top and antitop quark spins. In the helicity basis the measured degree of correlation corresponds to Ahelicity=0.40+0.09−0.08, in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations.
Item Description:G. Aad, G. Anders, V. Andrei, Y. Davygora, T.A. Dietzsch, C. Geweniger, P. Hanke, A. Khomich, E.-E. Kluge, A. Kugel, R. Maenner, K. Meier, F. Müller, S. Poddar, S. Schaetzel, V. Scharf, S. Schmitt, A. Schöning, S. Schmitt, N. Schroer, H.-C. Schultz-Coulon, R. Stamen, M. Wessels [und weitere]
Gesehen am 29.11.2018
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.108.212001

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