Dobado González, AntonioPeláez Sagredo, José RamónUrdiales, M.T.2023-06-202023-06-201997-12-010556-282110.1103/PhysRevD.56.7133https://hdl.handle.net/20.500.14352/58729© 1997 The American Physical Society. J.R.P would like to thank the Theory Group at Berkeley for their kind hospitality, the Jaime del Amo fundation for financial support, as well as M.J. Herrero and H.J. He for helpful discussions on the subject. This work has been partially supported by the Ministerio de Educación y Ciencia (Spain) Grant No. CICYT AEN93-0776).In this work we study the applicability of the equivalence theorem, either for unitary models or within an effective Lagrangian approach. There are two types of limitations: the existence of a validity energy window and the use of the lowest order in the electroweak constants. For the first kind, we consider some methods, based on dispersion theory or the large N limit, that allow us to extend the applicability. For the second, we obtain numerical estimates of the effect of neglecting higher orders in the perturbative expansion. [S0556-2821(97)04421-4].engjournal articlehttp://link.springer.com/article/10.1007%2Fs100529800993?LI=truehttp://link.springer.com/http://arxiv.org/abs/hep-ph/9710313open access53Chiral Perturbation-TheorySymmetry-Breaking SectorInteracting Higgs SectorStandard ModelHeavy HiggsPrecise FormulationWeak InteractionsLagrangiansScatteringUnitarityFísica (Física)22 Física