RENORMALIZATION OF WILSON OPERATORS IN MINKOWSKI SPACE

We make some comments on the renormalization of Wilson operators (not just vacuum expectation values of Wilson operators), and the features which arise in Minkowski space. If the Wilson loop contains a straight light-like segment, charge renormalization does not work in a simple graph-by-graph way, but does work when certain graphs are added togeth er. We also verify that, in a simple example of a smooth loop in Minko wski space, the existence of pairs of points which are light-like sepa rated does not cause any extra divergences. (C) 1998 Elsevier Science B.V.