An Equivalent Gauge and the Equivalence Theorem

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Abstract

I describe a novel covariant formulation of massive gauge theories in which the longitudinal polarization vectors do not grow with the energy. Therefore in the present formalism, differently from the ordinary one, the energy and coupling power-counting is completely transparent at the level of individual Feynman diagrams, with obvious advantages both at the conceptual and practical level.Since power-counting is transparent, the high-energy limit of the amplitudes involving longitudinal particles is immediately taken, and the Equivalence Theorem is easily demonstrated at all orders in perturbation theory. Since the formalism makes the Equivalence Theorem self-evident, and because it is based on a suitable choice of the gauge, we can call it an "Equivalent Gauge". © 2014 The Author.

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Wulzer, A. (2014). An Equivalent Gauge and the Equivalence Theorem. Nuclear Physics B, 885, 97–126. https://doi.org/10.1016/j.nuclphysb.2014.05.021

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