Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector
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...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72456 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1826188406091153408 |
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| author | Taylor, Frank E. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. |
| author_sort | Taylor, Frank E. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T07:59:09Z |
| format | Article |
| id | mit-1721.1/72456 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T07:59:09Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/724562022-09-23T10:05:43Z Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. Taylor, Frank E. 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. United States. Dept. of Energy. National Science Foundation (U.S.). 2012-08-30T14:49:15Z 2012-08-30T14:49:15Z 2012-05 2012-03 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/72456 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. https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1103/PhysRevLett.108.212001 Physical Review Letters 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. application/pdf American Physical Society APS |
| spellingShingle | Taylor, Frank E. Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector |
| title | Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector |
| title_full | Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector |
| title_fullStr | Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector |
| title_full_unstemmed | Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector |
| title_short | Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7 TeV Using the ATLAS Detector |
| title_sort | observation of spin correlation in tt events from pp collisions at √s 7 tev using the atlas detector |
| url | http://hdl.handle.net/1721.1/72456 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke observationofspincorrelationintteventsfromppcollisionsats7tevusingtheatlasdetector |