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

  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},
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… 
10 Citations

Strongly coupled theories beyond the Standard Model

Coupling of tt̄ and γγ with a strongly interacting Electroweak Symmetry Breaking Sector

We report the coupling of an external γγ or tt state to a strongly interacting EWSBS satisfying unitarity. We exploit perturbation theory for those coupling of the external state, whereas the EWSBS

Systematizing and addressing theory uncertainties of unitarization with the Inverse Amplitude Method

Effective Field Theories (EFTs) constructed as derivative expansions in powers of momentum, in the spirit of Chiral Perturbation Theory (ChPT), are a controllable approximation to strong dynamics as

SMEFT as a slice of HEFT’s parameter space

The Standard Model Effective Field Theory (SMEFT) is the parametrization chosen to interpret many modern measurements. We have recently discussed, building on the work of other groups, that its

Analytical Properties and Unitarization

This chapter includes a detailed study of the mathematical properties of the S-matrix, encoded in dispersion relations. Several unitarization procedures (IAM, N/D, old K-matrix and improved K-matrix)

Chiral EW Lagrangian

The ATLAS and CMS collaborations at LHC have found a new boson compatible with the SM Higgs, with a mass of nearly \(M_h\simeq 125\,\mathrm{GeV}\). Furthermore, the most probable \(J^P\) quantum

Resonant production of Wh and Zh at the LHC

A bstractWe examine the production of Wh and Zh pairs at the LHC in the context of a Strongly Interacting Symmetry Breaking Sector of the Standard Model. Our description is based on a non-linear

Coupling WW, ZZ unitarized amplitudes to $$\gamma \gamma $$γγ in the TeV region

We define and calculate helicity partial-wave amplitudes for processes linking the Electroweak Symmetry Breaking Sector (EWSBS) to $$\gamma \gamma $$γγ, employing (to NLO) the Higgs-EFT (HEFT)



Search for the Standard Model Higgs boson decaying into bb¯$$ b\overline{b} $$ produced in association with top quarks decaying hadronically in pp collisions at s=8$$ \sqrt{s}=8 $$ TeV with the ATLAS detector

A bstractA search for Higgs boson production in association with a pair of top quarks (tt¯H$$ t\overline{t}H $$) is performed, where the Higgs boson decays to bb¯$$ b\overline{b} $$, and both top

Heavy Higgs bosons in the Weinberg-Salam model

We search for a systematic way to characterize the low-energy sensitivity of the minimal Weinberg-Salam model to a heavy-Higgs-boson sector. We find that it is convenient to view this theory as the

Top-pair production at the LHC through NNLO QCD and NLO EW

A bstractIn this work we present for the first time predictions for top-quark pair differential distributions at the LHC at NNLO QCD accuracy and including EW corrections. For the latter we include

Unitarity, analyticity, dispersion relations, and resonances in strongly interacting $W_LW_L$, $Z_LZ_L$, and hh scattering

If the Electroweak Symmetry Breaking Sector turns out to be strongly interacting, the actively investigated effective theory for longitudinal gauge bosons plus Higgs can be efficiently extended to

The process ff-bar-->WLWL.

  • Veltman
  • Materials Science, Mathematics
    Physical review. D, Particles and fields
  • 1991
The calculation of the amplitude for the process f=t, which provides a check of the results of the equivalence theorem, according to which the leading energy term for the ${W}_{L} amplitude is given by the corresponding $\ensuremath{\varphi}$ amplitude.

Light 'Higgs', yet strong interactions

The claimed finding of a light Higgs boson makes the minimal Standard Model unitary. Yet, we recall that the general low-energy dynamics for the minimal electroweak symmetry breaking sector with

Possible New Resonance from W_{L}W_{L}-hh Interchannel Coupling.

This paper exposes this channel-coupling resonance from unitarity and dispersion relations encoded in the inverse amplitude method, applied to the electroweak chiral Lagrangian with a scalar Higgs boson.

Effective theory of a dynamically broken electroweak Standard Model at NLO

A bstractWe consider the Standard Model as an effective theory at the weak scale v of a generic new strong interaction that dynamically breaks electroweak symmetry at the energy scale Λ ~ (few) TeV.

One-loop WLWL and ZLZL scattering from the electroweak Chiral Lagrangian with a light Higgs-like scalar

A bstractBy including the recently discovered Higgs-like scalar φ in the Electroweak Chiral Lagrangian, and using the Equivalence Theorem, we carry out the complete one-loop computation of the