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Type: Journal article
Title: Search for tt⁻ resonances in the lepton plus jets final state with ATLAS using 4.7  fb⁻¹ of pp collisions at √s = 7  TeV
Other Titles: Search for tt(-) resonances in the lepton plus jets final state with ATLAS using 4.7fb(-1) of pp collisions at root s = 7TeV
Author: Aad, G.
ATLAS Collaboration
Citation: Physical Review D: Particles, Fields, Gravitation and Cosmology, 2013; 88(1):012004-1-012004-28
Publisher: American Physical Society
Issue Date: 2013
ISSN: 1550-2368
Statement of
G.Aad ... P.Jackson ... L.Lee ... A.Petridis ... N.Soni ... M.J.White ... et al. (ATLAS Collaboration)
Abstract: A search for new particles that decay into top quark pairs (tt⁻) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7  fb⁻¹ of proton–proton (pp) collision data collected at a center-of-mass energy √s = 7  TeV. In the tt⁻→WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt⁻ 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 tt⁻ invariant mass spectrum is performed. No evidence for a tt⁻ 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′ 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′ 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.
Rights: © 2013 CERN, for the ATLAS Collaboration. 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.
DOI: 10.1103/PhysRevD.88.012004
Grant ID: ARC
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