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Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7  TeV Using the ATLAS Detector

Author(s)
Taylor, Frank E.
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Abstract
A measurement of spin correlation in tt̅ production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1  fb[superscript -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[subscript -0.08][superscript +0.09], in agreement with the next-to-leading-order standard model prediction. The hypothesis of zero spin correlation is excluded at 5.1 standard deviations.
Date issued
2012-05
URI
http://hdl.handle.net/1721.1/72456
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aad, G. et al. “Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7  TeV Using the ATLAS Detector.” Physical Review Letters 108.21 (2012): 212001. © 2012 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.
Version: Final published version
ISSN
0031-9007
1079-7114

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