Summary
The techniques developed in a previous paper (1), for treating soft photons in quantum electrodynamics by coupling them to an equivalent classical current, are used to study the infra-red behaviour of Z2. When the photon’s Green’s function is of the form {ie1644-01}, it is found that the second-order infra-red divergence of Z2 exponentiates in such a way that, so far as infra-red effects are concerned, Z2 is zero for λ<-2, finite for λ =-2, and infinite for λ >- 2.
Riassunto
Si usano le tecniche sviluppate in un articolo precedente per trattare i fotoni molli in elettrodinamica quantistica accoppiandoli ad una corrente olassioa équivalente, per studiare il comportamento all’infrarosso di Z2. Quando la funzione di Green del fotone Υ è della forma {ie1648-01}, si trova che la divergenza infrarossa del secondo ordine di Z2 assume esponenti tali che, per quanto concerne gli effetti infra-rossi, Z2 è zero per λ<-2, finito per λ =-2 ed inflnito per λ>-2.
Similar content being viewed by others
Reference
R. Perrin andE. L. Lomon:Annals of Physics (to be published), referred to as I.
Author information
Authors and Affiliations
Additional information
This work is supported in part through funds provided by the Atomic Energy Commission under Contract AT(30-l)2098.
Rights and permissions
About this article
Cite this article
Perrin, R. Infra-red behaviour of the wave function renormalization constant in covariant gauges. Nuovo Cim 38, 1644–1648 (1965). https://doi.org/10.1007/BF02750085
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02750085