The color package takes for its input a combination of group structure constants and generator. If all indices are contracted it will rewrite this input in terms of group invariants in a group and representation independent way.

The whole is based on the paper:

T. van Ritbergen, A.N. Schellekens and J.A.M. Vermaseren: "Group theory factors for Feynman diagrams", Int. J. Mod. Phys. vol. 14 (1999) 41.

The various files are:

color.h : (84 Kb) The library file with the FORM code.

color.h.gz : (11 Kb) the gzipped version of color.h.

color.tex : (189 Kb) The LaTeX sources of the paper describing the algorithms and giving values for the invariants for the classical Lie groups and many of their representations. Note that one needs the axodraw style file in order to process these sources.

color.tex.gz : (53 Kb) The gzipped version of color.tex.

color.ps : (554 Kb) The postscript file of the paper.

color.ps.gz : (164 Kb) The gzipped postscript file of the paper.