A search for t[bar over t] 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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A search for t[bar over t] 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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A search for t[bar over t] 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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ATLAS Collaboration; Mitsou, Vasiliki; Fuster Verdú, Juan A. Perfil; Ferrer Soria, Antonio Perfil; Castillo Giménez, María Victoria Perfil; Cabrera Urbán, Susana Perfil; García García, Carmen Perfil; Higón Rodríguez, Emilio Perfil; Martí García, Salvador; Ros Martínez, Eduardo; González de la Hoz, Santiago Perfil; Salt Cairols, José Perfil; Valls Ferrer, Juan Antonio; Kaci, Mohammed; Fiorini, Luca; Hernández Jiménez, Yesenia; Lacasta Llácer, Carlos; Villaplana Pérez, Miguel
This document is a artículoDate2012

Este documento está disponible también en : http://hdl.handle.net/10550/37277
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.

    ATLAS Collaboration Mitsou, Vasiliki Fuster Verdú, Juan A. Ferrer Soria, Antonio Castillo Giménez, María Victoria Cabrera Urbán, Susana García García, Carmen Higón Rodríguez, Emilio Martí García, Salvador Ros Martínez, Eduardo González de la Hoz, Santiago Salt Cairols, José Valls Ferrer, Juan Antonio Kaci, Mohammed Fiorini, Luca Hernández Jiménez, Yesenia Lacasta Llácer, Carlos Villaplana Pérez, Miguel 2012 A search for t[bar over t] resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at √s = 7 TeV with the ATLAS detector Journal of High Energy Physics 2012 09-041 1 45
http://dx.doi.org/10.1007/JHEP09(2012)041

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