Eur. Phys. J. C (2008) 53: 649-657
https://doi.org/10.1140/epjc/s10052-007-0486-1

Regular Article - Theoretical Physics

Gauge dependence of Green’s functions in QCD and QED

¹ Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
² High Energy Physics Division, Department of Physical Sciences, University of Helsinki, Helsinki, Finland
³ Helsinki Institute of Physics, P.O. Box 64, 00014, Helsinki, Finland

^* e-mail: anca.tureanu@helsinki.fi

Received: 4 October 2007
Published online: 18 December 2007

Abstract

When all Green’s functions are known in a given gauge we may raise the question of whether it is possible or not to derive the corresponding ones in a different gauge. The answer is negative in QCD but affirmative in QED provided that we confine ourselves to the covariant gauge characterized by a gauge parameter α. We shall discuss the physical significance of this conclusion.