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Search for ttbar resonances in semileptonic final state

We present a search for the production of heavy resonances decaying into top-antitop quark pairs at the CMS Experiment. The data correspond to an integrated luminosity of $19.6$~fb$^{-1}$ at $\sqrt{s}=8$ TeV. We consider all events containing one muon or electron and at least two jets in the final s...

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Autor principal: CMS Collaboration
Publicado: 2013
Materias:
Acceso en línea:http://cds.cern.ch/record/1543467
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author CMS Collaboration
author_facet CMS Collaboration
author_sort CMS Collaboration
collection CERN
description We present a search for the production of heavy resonances decaying into top-antitop quark pairs at the CMS Experiment. The data correspond to an integrated luminosity of $19.6$~fb$^{-1}$ at $\sqrt{s}=8$ TeV. We consider all events containing one muon or electron and at least two jets in the final state. We present results from the combination of two dedicated searches, the first optimized for $\mathrm{t}\bar{\mathrm{t}}$ production at the kinematic production threshold, and the other optimized for $\mathrm{t}\bar{\mathrm{t}}$ production produced with high Lorentz boosts. We do not observe any excess of events above the expected yield from the standard model processes. We set the following limits at 95\% CL on the production of non-SM particles: topcolor $Z'$ bosons with relative widths of 1.2\% and 10\% are excluded for masses below $2.1$~TeV and $2.7$~TeV. An upper limit of $1.94$~pb and $0.029$~pb is set on the production cross section times branching fraction for narrow resonances with masses of $0.5$~TeV and $2$~TeV. Likewise, limits of $1.71$~pb and $0.045$~pb are set for wide resonances with masses of $0.5$~TeV and $2$~TeV. In addition, Kaluza--Klein excitations of a gluon with masses below $2.5$~TeV in the Randall--Sundrum model are excluded and an upper limit of $0.101$~pb is set for a resonance mass of $2$~TeV.
id cern-1543467
institution Organización Europea para la Investigación Nuclear
publishDate 2013
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spelling cern-15434672019-09-30T06:29:59Zhttp://cds.cern.ch/record/1543467CMS CollaborationSearch for ttbar resonances in semileptonic final stateParticle Physics - ExperimentWe present a search for the production of heavy resonances decaying into top-antitop quark pairs at the CMS Experiment. The data correspond to an integrated luminosity of $19.6$~fb$^{-1}$ at $\sqrt{s}=8$ TeV. We consider all events containing one muon or electron and at least two jets in the final state. We present results from the combination of two dedicated searches, the first optimized for $\mathrm{t}\bar{\mathrm{t}}$ production at the kinematic production threshold, and the other optimized for $\mathrm{t}\bar{\mathrm{t}}$ production produced with high Lorentz boosts. We do not observe any excess of events above the expected yield from the standard model processes. We set the following limits at 95\% CL on the production of non-SM particles: topcolor $Z'$ bosons with relative widths of 1.2\% and 10\% are excluded for masses below $2.1$~TeV and $2.7$~TeV. An upper limit of $1.94$~pb and $0.029$~pb is set on the production cross section times branching fraction for narrow resonances with masses of $0.5$~TeV and $2$~TeV. Likewise, limits of $1.71$~pb and $0.045$~pb are set for wide resonances with masses of $0.5$~TeV and $2$~TeV. In addition, Kaluza--Klein excitations of a gluon with masses below $2.5$~TeV in the Randall--Sundrum model are excluded and an upper limit of $0.101$~pb is set for a resonance mass of $2$~TeV.CMS-PAS-B2G-12-006oai:cds.cern.ch:15434672013
spellingShingle Particle Physics - Experiment
CMS Collaboration
Search for ttbar resonances in semileptonic final state
title Search for ttbar resonances in semileptonic final state
title_full Search for ttbar resonances in semileptonic final state
title_fullStr Search for ttbar resonances in semileptonic final state
title_full_unstemmed Search for ttbar resonances in semileptonic final state
title_short Search for ttbar resonances in semileptonic final state
title_sort search for ttbar resonances in semileptonic final state
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1543467
work_keys_str_mv AT cmscollaboration searchforttbarresonancesinsemileptonicfinalstate