Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
This paper presents a measurement of the top quark pair (t[bar over t]) production charge asymmetry A [subscript C] using 4.7 fb[superscript −1] of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A t[bar over t]-enriched sample of events wit...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2014
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| Online Access: | http://hdl.handle.net/1721.1/88594 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1826194584427823104 |
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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 | This paper presents a measurement of the top quark pair (t[bar over t]) production charge asymmetry A [subscript C] using 4.7 fb[superscript −1] of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A t[bar over t]-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the t[bar over t] event kinematics. A Bayesian unfolding procedure is employed to estimate A [subscript C] at the parton-level. The measured value of the t[bar over t] production charge asymmetry is A [subscript C] = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A [subscript C] measurements as a function of the invariant mass, the rapidity and the transverse momentum of the t[bar over t] system are also presented. In addition, A [subscript C] is measured for a subset of events with large t[bar over t] velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions. |
| first_indexed | 2024-09-23T09:58:12Z |
| format | Article |
| id | mit-1721.1/88594 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T09:58:12Z |
| publishDate | 2014 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/885942022-09-30T18:02:35Z Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. This paper presents a measurement of the top quark pair (t[bar over t]) production charge asymmetry A [subscript C] using 4.7 fb[superscript −1] of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A t[bar over t]-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the t[bar over t] event kinematics. A Bayesian unfolding procedure is employed to estimate A [subscript C] at the parton-level. The measured value of the t[bar over t] production charge asymmetry is A [subscript C] = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A [subscript C] measurements as a function of the invariant mass, the rapidity and the transverse momentum of the t[bar over t] system are also presented. In addition, A [subscript C] is measured for a subset of events with large t[bar over t] velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions. United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2014-08-07T18:19:36Z 2014-08-07T18:19:36Z 2014-02 2013-11 Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/88594 Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Measurement of the Top Quark Pair Production Charge Asymmetry in Proton-Proton Collisions at √s = 7 TeV Using the ATLAS Detector.” J. High Energ. Phys. 2014, no. 2 (February 2014). © CERN, for the benefit of the ATLAS Collaboration https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1007/jhep02(2014)107 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Taylor, Frank E. Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
| title | Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
| title_full | Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
| title_fullStr | Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
| title_full_unstemmed | Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
| title_short | Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector |
| title_sort | measurement of the top quark pair production charge asymmetry in proton proton collisions at √s 7 tev using the atlas detector |
| url | http://hdl.handle.net/1721.1/88594 https://orcid.org/0000-0002-7586-7253 |
| work_keys_str_mv | AT taylorfranke measurementofthetopquarkpairproductionchargeasymmetryinprotonprotoncollisionsats7tevusingtheatlasdetector |