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Due to the gap between the known 100 GeV scale and new physics if any, it isnatural to employ an effective one-loop Lagrangian (HEFT) for the particles ofthe Electroweak Symmetry Breaking Sector (W_L, Z_L and h). To describe any newparticles and resonances that may be found at the LHC we employ its unitarizedamplitudes, valid even in the presence of new strong interactions. We haveassessed the systematics by comparing several such methods, and find that theygive qualitatively similar results and succesfully produce unitary amplitudesin the nonperturbative regime. We are thus in a position to describe newphysics in the 0.5 TeV-3 TeV (region of validity of our approximations: theeffective theory and the equivalence theorem to substitute W_L, Z_L by theGoldstone bosons of electroweak symmetry breaking). We have also computed thecoupling of the EWSBS to the top-antitop and two-photon channels to describeresonances that decay through them or to study their photon-photon production,for example. The approach is universal and useful for many BSM theories at lowenergy.

Electroweak resonances in HEFT