• DOI:10.1140/epjc/s10052-017-4991-6
• Corpus ID: 119201367

Top–antitop production from $$W^+_L W^-_L$$WL+WL- and $$Z_L Z_L$$ZLZL scattering under a strongly interacting symmetry-breaking sector

@article{Castillo2016TopantitopPF,
  title={Top–antitop production from \$\$W^+\_L W^-\_L\$\$WL+WL- and \$\$Z\_L Z\_L\$\$ZLZL scattering under a strongly interacting symmetry-breaking sector},
  author={Andr'es Castillo and Rafael L. Delgado and Antonio Dobado and Felipe J. Llanes-Estrada},
  journal={The European Physical Journal C},
  year={2016},
  volume={77},
  pages={1-14}
}

• A. Castillo, R. Delgado, +1 author F. Llanes-Estrada
• Published 5 July 2016
• Physics
• The European Physical Journal C

By considering a non-linear electroweak chiral Lagrangian, including the Higgs, coupled to heavy quarks, and the equivalence theorem, we compute the one-loop scattering amplitudes $$W^+W^-\rightarrow t\bar{t}$$W+W-→tt¯, $$ZZ\rightarrow t\bar{t}$$ZZ→tt¯ and $$hh\rightarrow t\bar{t}$$hh→tt¯ (in the regime $$M_t^2/v^2\ll \sqrt{s}M_t/v^2\ll s/v^2$$Mt2/v2≪sMt/v2≪s/v2 and to NLO in the effective theory). We calculate the scalar partial-wave helicity amplitudes which allow us to check unitarity at the perturbative level in both $$M_t/v$$Mt/v and s/v. As with growing energy perturbative unitarity deteriorates, we also introduce a new unitarization method with the right analytical behavior on the complex s-plane and that can support poles on the second Riemann sheet to describe resonances in terms of the Lagrangian couplings. Thus we have achieved a consistent phenomenological description of any resonant $$t\bar{t}$$tt¯ production that may be enhanced by a possible strongly interacting electroweak symmetry breaking sector.