# A search for ttbar resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

7 Laboratoire de Physique Corpusculaire
LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
8 APC - Neutrinos
LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies, APC - UMR 7164 - AstroParticule et Cosmologie
Abstract : A search for resonant production of high-mass top-quark pairs is performed on 2.05 fb^-1 of proton-proton collisions at sqrt(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 ttbar invariant mass spectrum is found to be compatible with the Standard Model prediction and 95% credibility level upper limits are derived on the ttbar 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.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer, 2012, 09 (2012), pp.041. 〈10.1007/JHEP09(2012)041〉

http://hal.in2p3.fr/in2p3-00716652
Contributeur : Danielle Cristofol <>
Soumis le : mercredi 11 juillet 2012 - 08:28:07
Dernière modification le : mardi 30 mai 2017 - 01:03:48

### Citation

G. Aad, S. Aoun, C. P. Bee, C. Bertella, N. Bousson, et al.. A search for ttbar resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector. Journal of High Energy Physics, Springer, 2012, 09 (2012), pp.041. 〈10.1007/JHEP09(2012)041〉. 〈in2p3-00716652〉

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