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We show in this paper how to construct Symanzik polynomials and the Schwingerparametric representation of Feynman amplitudes for gauge theories in anunspecified covariant gauge. The complete Mellin representation of suchamplitudes is then established in terms of invariants (squared sums of externalmomenta and squared masses). From the scaling of the invariants by a parameterwe extend for the present situation a theorem on asymptotic expansions,previously proven for the case of scalar field theories, valid for bothultraviolet and infrared behaviors of Feynman amplitudes.Comment: 10 pages, revtex, no figure

ASYMPTOTIC EXPANSIONS OF FEYNMAN AMPLITUDES IN A GENERIC COVARIANT GAUGE