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A search for tt¯ resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at s√=7 TeV with the ATLAS detector

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Article number41
<mark>Journal publication date</mark>09/2012
<mark>Journal</mark>Journal of High Energy Physics
Issue number9
Volume2012
Number of pages45
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A search for resonant production of high-mass top-quark pairs is performed on 2.05 fb−1 of proton-proton collisions at s√=7 TeV collected in 2011 with the ATLAS experiment at the Large Hadron Collider. This analysis of the lepton+jets final state is specifically designed for the particular topology that arises from the decay of highly boosted top quarks. The observed tt¯ invariant mass spectrum is found to be compatible with the Standard Model prediction and 95% credibility level upper limits are derived on the tt¯ production rate through new massive states. An upper limit of 0.7 pb is set on the production cross section times branching fraction of a narrow 1 TeV resonance. A Kaluza-Klein gluon with a mass smaller than 1.5 TeV is excluded.

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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.