Applicability constraints of the Equivalence Theorem

Details Applicability constraints of the Equivalence Theorem Applicability constraints of the Equivalence Theorem

1997-01-31

arxiv.org/abs/hep-ph/9702206v2

Phys.Rev. D56 (1997) 7133-7142

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version to appear in Phys. Rev. D. Power counting and energy range estimates have been refined, improved referencing. 4

Scientific paper

10.1103/PhysRevD.56.7133

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 have obtained numerical estimates of the effect of neglecting higher orders in the perturbative expansion.

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