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

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

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Title: Observation of Spin Correlation in tt̄ Events from pp Collisions at √s = 7 TeV Using the ATLAS Detector
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdel Khalek, S.;
Abdelalim, A. A.;
Abdesselam, A.;
Abdinov, O.;
Ahsan, Mahsana (UT Dallas);
Izen, Joseph M. (UT Dallas);
Lou, Xinchou (UT Dallas);
Reeves, Kendall (UT Dallas);
Wong, Wei-Cheng (UT Dallas);
ATLAS Collaboration
Format: Text
Item Type: Article
Keywords: Nuclear physics
Leptons (Nuclear physics)
Tellurium compounds
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⁻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 A_{helicity} = 0.40 _{-0.08}^{+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.
Publisher: American Physical Society
ISSN: 0031-9007
Persistent Link: http://hdl.handle.net/10735.1/3075
http://dx.doi.org/10.1103/PhysRevLett.108.212001
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, et al. 2012. "Observation of spin correlation in tt̄ events from pp collisions at √s = 7 TeV using the ATLAS detector." Physical Review Letters 108(21), doi:10.1103/PhysRevLett.108.212001
Terms of Use: CC BY 3.0 (Attribution) License
© 2012 CERN, for the ATLAS Collaboration

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