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https://hdl.handle.net/2440/101923
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Type: | Journal article |
Title: | Observation of spin correlation in tt⁻ events from pp collisions at √s = 7 TeV using the ATLAS Detector |
Other Titles: | Observation of spin correlation in tt(-) events from pp collisions at root s = 7TeV using the ATLAS Detector |
Author: | Aad, G. ATLAS Collaboration, |
Citation: | Physical Review Letters, 2012; 108(21):212001-1-212001-19 |
Publisher: | American Physical Society |
Issue Date: | 2012 |
ISSN: | 1079-7114 1079-7114 |
Statement of Responsibility: | G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration) |
Abstract: | A measurement of spin correlation in tt⁻ 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. |
Keywords: | ATLAS Collaboration |
Rights: | © 2012 CERN, for the ATLAS Collaboration. 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. |
DOI: | 10.1103/PhysRevLett.108.212001 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1103/physrevlett.108.212001 |
Appears in Collections: | Aurora harvest 7 Physics publications |
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hdl_101923.pdf | Published version | 600.02 kB | Adobe PDF | View/Open |
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