Strong tW scattering at the LHC

Dror, Jeff Asaf; Farina, Marco; Salvioni, Ennio; Serra, Javi

doi:10.1007/JHEP01(2016)071

Title: Strong tW scattering at the LHC

Journal Article · 13 January 2016 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/JHEP01(2016)071 · OSTI ID:1327317

Dror, Jeff Asaf ^[1]; Farina, Marco ^[2]; Salvioni, Ennio ^[3]; Serra, Javi ^[4]

Cornell Univ., Ithaca, NY (United States); Rutgers University
Cornell Univ., Ithaca, NY (United States); Rutgers Univ., Piscataway, NJ (United States)
Univ. of California, Davis, CA (United States)
Univ. di Padova and INFN, Padova (Italy); European Organization for Nuclear Research (CERN), Geneva (Switzerland)

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→$$t\bar{t}$$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. Lastly, we present other scattering processes in the same class that could provide further tests of the top-Higgs sector.

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Research Organization:: Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0003883

OSTI ID:: 1327317

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2016; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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