A search for t(t)over-bar resonances in lepton plus jets events with highly boosted top quarks collected in pp collisions at root s=7 TeV with the ATLAS detector
2012 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, Vol. 9, 041- p.Article in journal (Refereed) Published
A search for resonant production of high-mass top-quark pairs is performed on 2.05 fb(-1) of proton-proton collisions at root 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 t (t) over bar invariant mass spectrum is found to be compatible with the Standard Model prediction and 95% credibility level upper limits are derived on the t (t) over bar 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.
Place, publisher, year, edition, pages
2012. Vol. 9, 041- p.
IdentifiersURN: urn:nbn:se:uu:diva-190820DOI: 10.1007/JHEP09(2012)041ISI: 000310341300030OAI: oai:DiVA.org:uu-190820DiVA: diva2:584320
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1007/JHEP09(2012)0412013-01-082013-01-08Bibliographically approved