Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV
A search for new particles that decay into top quark pairs (tt̅ ) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb[superscript -1] of proton–proton (pp) collision data collected at a center-of-mass energy √s=7 TeV. In the tt̅ →WbWb decay, the lepton plus j...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/81348 https://orcid.org/0000-0002-7586-7253 |
| _version_ | 1811092876246908928 |
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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 search for new particles that decay into top quark pairs (tt̅ ) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb[superscript -1] of proton–proton (pp) collision data collected at a center-of-mass energy √s=7 TeV. In the tt̅ →WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt̅ system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the tt̅ invariant mass spectrum is performed. No evidence for a tt̅ resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z[superscript ′] resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z[superscript ′] resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with Γ/m=15.3%. A Kaluza–Klein excitation of the gluon in a Randall–Sundrum model is excluded for masses below 2.07 TeV. |
| first_indexed | 2024-09-23T15:32:07Z |
| format | Article |
| id | mit-1721.1/81348 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:32:07Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/813482022-09-29T14:50:46Z Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV Taylor, Frank E. Massachusetts Institute of Technology. Department of Physics Taylor, Frank E. A search for new particles that decay into top quark pairs (tt̅ ) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb[superscript -1] of proton–proton (pp) collision data collected at a center-of-mass energy √s=7 TeV. In the tt̅ →WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt̅ system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the tt̅ invariant mass spectrum is performed. No evidence for a tt̅ resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z[superscript ′] resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z[superscript ′] resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with Γ/m=15.3%. A Kaluza–Klein excitation of the gluon in a Randall–Sundrum model is excluded for masses below 2.07 TeV. United States. Dept. of Energy National Science Foundation (U.S.) Brookhaven National Laboratory 2013-10-09T12:56:45Z 2013-10-09T12:56:45Z 2013-07 2013-05 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1089-4918 http://hdl.handle.net/1721.1/81348 Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. “Search for tt[over ¯] resonances in the lepton plus jets final state with ATLAS using 4.7 fb^{-1} of pp collisions at sqrt[s]=7 TeV.” Physical Review D 88, no. 1 (July 2013). © 2013 CERN https://orcid.org/0000-0002-7586-7253 en_US http://dx.doi.org/10.1103/PhysRevD.88.012004 Physical Review D 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 American Physical Society |
| spellingShingle | Taylor, Frank E. Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV |
| title | Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV |
| title_full | Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV |
| title_fullStr | Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV |
| title_full_unstemmed | Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV |
| title_short | Search for t[¯ over t] resonances in the lepton plus jets final state with ATLAS using 4.7 fb[superscript -1] of pp collisions at √s=7 TeV |
| title_sort | search for t ¯ over t resonances in the lepton plus jets final state with atlas using 4 7 fb superscript 1 of pp collisions at √s 7 tev |
| url | http://hdl.handle.net/1721.1/81348 https://orcid.org/0000-0002-7586-7253 |
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