Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector
Name
Aad-2012-Observation of Spin Correlation in.pdf
Size
353.71 KB
Format
Adobe PDF
Checksum (MD5)
cf328799fbbb1e690abce778d11b29f3
Author(s)
Taylor, Frank E.
Date Issued
May 2012
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.212001
