PINCHED GLUON VERTEX OPERATOR IN THE SUPER WORLD-LINE FORMALISM

摘要

We reformulate, using the super world-line formalism, the pinched gluon vertex operator proposed by Strassler. The pinched vertex operator turns out to be the product of two gluon vertex operators with the insertion of a delta-function which makes the super distances between them zero. Thus the pinch procedures turn out to be nothing but the insertions of delta-functions. Applying our formulation to two-loop diagrams which are the QED correction to gluon scatterings via a single spinor loop, with the QED charge e being replaced by the strong coupling g, we give various formulae on pinched N-point functions. (C) 1997 Elsevier Science B.V. [References: 27]