This package calculates the color factor in non-abelian gauge field theories using an algorithm due to Cvitanovich.
Documentation for this package is in plain text.
Author: A. Kryukov.
Program "xCOLOR" is intended for calculation the colour factor in non-abelian gauge field theories. It is realized Cvitanovich algorithm . In comparision with "COLOR" program  it was made many improvements. The package was writen by symbolic mode. This version is faster then  more then 10 times.
After load the program by the following command load xcolor;
user can be able to use the next additional commands and operators.
Format: SUdim <any expression>;
Set the order of SU group.
The default value is 3, i.e. SU(3).
Format: SpTT <any expression>;
Set the normalization coefficient A: Sp(TiTj) = A*Delta(i,j). Default value is 1/2.
Describe the quark-gluon vertex. Parameters may be any identifiers. First and second of then must be in- and out- quarks correspondently. Third one is a gluon.
Describe the three-gluon vertex. Parameters may be any identifiers. The order of gluons must be clock.
In terms of QG and G3 operators you input diagram in "color" space as a product of these operators. For example.
More detail see .
 P.Cvitanovic, Phys. Rev. D14(1976), p.1536.
 A.Kryukov & A.Rodionov, Comp. Phys. Comm., 48(1988), pp.327-334.
Please send any remarks to my address above!