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Strong tW Scattering at the LHC

Deviations of the top electroweak couplings from their Standard Model values imply that certain amplitudes for the scattering of third generation fermions and longitudinally polarized vector bosons or Higgses diverge quadratically with momenta. This high-energy growth is a genuine signal of models w...

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Detalles Bibliográficos
Autores principales: Dror, Jeff Asaf, Farina, Marco, Salvioni, Ennio, Serra, Javi
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP01(2016)071
http://cds.cern.ch/record/2093335
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author Dror, Jeff Asaf
Farina, Marco
Salvioni, Ennio
Serra, Javi
author_facet Dror, Jeff Asaf
Farina, Marco
Salvioni, Ennio
Serra, Javi
author_sort Dror, Jeff Asaf
collection CERN
description Deviations of the top electroweak couplings from their Standard Model values imply that certain amplitudes for the scattering of third generation fermions and longitudinally polarized vector bosons or Higgses diverge quadratically with momenta. This high-energy growth is a genuine signal of models where the top quark is strongly coupled to the sector responsible for electroweak symmetry breaking. We propose to profit from the high energies accessible at the LHC to enhance the sensitivity to non-standard top-$Z$ couplings, which are currently very weakly constrained. To demonstrate the effectiveness of the approach, we perform a detailed analysis of $tW \to tW$ scattering, which can be probed at the LHC via $pp\to t\bar{t}Wj$. By recasting a CMS analysis at 8 TeV, we derive the strongest direct bounds to date on the $Ztt$ couplings. We also design a dedicated search at 13 TeV that exploits the distinctive features of the $t\bar{t}Wj$ signal. Finally, we present other scattering processes in the same class that could provide further tests of the top-Higgs sector.
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institution Organización Europea para la Investigación Nuclear
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publishDate 2015
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spelling cern-20933352022-08-10T12:47:56Zdoi:10.1007/JHEP01(2016)071http://cds.cern.ch/record/2093335engDror, Jeff AsafFarina, MarcoSalvioni, EnnioSerra, JaviStrong tW Scattering at the LHCParticle Physics - PhenomenologyDeviations of the top electroweak couplings from their Standard Model values imply that certain amplitudes for the scattering of third generation fermions and longitudinally polarized vector bosons or Higgses diverge quadratically with momenta. This high-energy growth is a genuine signal of models where the top quark is strongly coupled to the sector responsible for electroweak symmetry breaking. We propose to profit from the high energies accessible at the LHC to enhance the sensitivity to non-standard top-$Z$ couplings, which are currently very weakly constrained. To demonstrate the effectiveness of the approach, we perform a detailed analysis of $tW \to tW$ scattering, which can be probed at the LHC via $pp\to t\bar{t}Wj$. By recasting a CMS analysis at 8 TeV, we derive the strongest direct bounds to date on the $Ztt$ couplings. We also design a dedicated search at 13 TeV that exploits the distinctive features of the $t\bar{t}Wj$ signal. Finally, we present other scattering processes in the same class that could provide further tests of the top-Higgs sector.Deviations of the top electroweak couplings from their Standard Model values imply that certain amplitudes for the scattering of third generation fermions and longitudinally polarized vector bosons or Higgses diverge quadratically with momenta. This high-energy growth is a genuine signal of models where the top quark is strongly coupled to the sector responsible for electroweak symmetry breaking. We propose to profit from the high energies accessible at the LHC to enhance the sensitivity to non-standard top-Z couplings, which are currently very weakly constrained. To demonstrate the effectiveness of the approach, we perform a detailed analysis of tW → tW scattering, which can be probed at the LHC via $ pp\to t\overline{t}W\,j $ . By recasting a CMS analysis at 8 TeV, we derive the strongest direct bounds to date on the Ztt couplings. We also design a dedicated search at 13 TeV that exploits the distinctive features of the $ t\overline{t}W\,j $ signal. Finally, we present other scattering processes in the same class that could provide further tests of the top-Higgs sector.Deviations of the top electroweak couplings from their Standard Model values imply that certain amplitudes for the scattering of third generation fermions and longitudinally polarized vector bosons or Higgses diverge quadratically with momenta. This high-energy growth is a genuine signal of models where the top quark is strongly coupled to the sector responsible for electroweak symmetry breaking. We propose to profit from the high energies accessible at the LHC to enhance the sensitivity to non-standard top-$Z$ couplings, which are currently very weakly constrained. To demonstrate the effectiveness of the approach, we perform a detailed analysis of $tW \to tW$ scattering, which can be probed at the LHC via $pp\to t\bar{t}Wj$. By recasting a CMS analysis at 8 TeV, we derive the strongest direct bounds to date on the $Ztt$ couplings. We also design a dedicated search at 13 TeV that exploits the distinctive features of the $t\bar{t}Wj$ signal. Finally, we present other scattering processes in the same class that could provide further tests of the top-Higgs sector.arXiv:1511.03674CERN-PH-TH-2015-265CERN-PH-TH-2015-265oai:cds.cern.ch:20933352015-11-11
spellingShingle Particle Physics - Phenomenology
Dror, Jeff Asaf
Farina, Marco
Salvioni, Ennio
Serra, Javi
Strong tW Scattering at the LHC
title Strong tW Scattering at the LHC
title_full Strong tW Scattering at the LHC
title_fullStr Strong tW Scattering at the LHC
title_full_unstemmed Strong tW Scattering at the LHC
title_short Strong tW Scattering at the LHC
title_sort strong tw scattering at the lhc
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP01(2016)071
http://cds.cern.ch/record/2093335
work_keys_str_mv AT drorjeffasaf strongtwscatteringatthelhc
AT farinamarco strongtwscatteringatthelhc
AT salvioniennio strongtwscatteringatthelhc
AT serrajavi strongtwscatteringatthelhc