# A Search for tt¯ Resonances With the ATLAS Detector in 2.05 Fb−1 of Proton-Proton Collisions at √s=7 TeV

 Title: A Search for tt¯ Resonances With the ATLAS Detector in 2.05 Fb−1 of Proton-Proton Collisions at √s=7 TeV Author: Huth, John; Jeanty, L; Kagan, M; Lopez Mateos, David; Mercurio, Kevin ; Morii, Masahiro; Zevi Della Porta, G Note: Order does not necessarily reflect citation order of authors. Citation: ATLAS Collaboration. 2012. “A Search for tt¯ Resonances With the ATLAS Detector in 2.05 Fb−1 of Proton-Proton Collisions at √s=7 TeV.” The European Physical Journal C 72 (7) (July). doi:10.1140/epjc/s10052-012-2083-1. Full Text & Related Files: 10.1140%2Fepjc%2Fs10052-012-2083-1.pdf (1.552Mb; PDF) Abstract: A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb−1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to tt¯ for narrow and wide resonances. For narrow Z′ bosons, the observed 95 % Bayesian credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of m Z′=500 GeV to m Z′=1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z′ boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is m Z′<880 GeV ( mgKK<1130 GeV ). Published Version: doi:10.1140/epjc/s10052-012-2083-1 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:33840770 Downloads of this work: