From Multiloop Spinor Helicity Technique to String Reorganization

Abstract

The success of the spinor helicity technique for tree processes is reviewed. To apply it to multiloop diagrams one is naturally led to the Schwinger proper-time representation, whose properties are discussed. This representation also serves as a useful link between field theories and string theories.

Comments: 8 pages in Plain Tex, plus 1 page of (four) figures in a postcript file attached to the end of the Tex file