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Program "xCOLOR". User's Manual. -------------------------------- A.Kryukov Institute for Nuclear Physics Moscow State University 119899, Moscow, RUSSIA E-mail: kryukov@npi.msu.su Phone/Fax: (095) 939-0397 Abstract Program "xCOLOR" is intended for calculation the colour factor in non-abelian gauge field theories. It is realized Cvitanovich algorithm [1]. In comparision with "COLOR" program [2] it was made many improvements. The package was writen by symbolic mode. This version is faster then [2] 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. Command SUdim. -------------- Format: SUdim <any expression>; Set the order of SU group. The default value is 3, i.e. SU(3). Command SpTT. ------------- Format: SpTT <any expression>; Set the normalization coefficient A: Sp(TiTj) = A*Delta(i,j). Default value is 1/2. Operator QG. ------------ Format: QG(inQuark,outQuark,Gluon) 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. Operator G3. ------------ Format: G3(Gluon1,Gluon2,Gluon3) 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. Diagram: REDUCE expression: e1 ---->--- / \ | e2 | v1*..........*v2 <===> QG(e3,e1,e2)*QG(e1,e3,e2) | | \ e3 / ----<--- Here: --->--- quark ....... gluon More detail see [2]. References. ----------- [1] P.Cvitanovic, Phys. Rev. D14(1976), p.1536. [2] A.Kryukov & A.Rodionov, Comp. Phys. Comm., 48(1988), pp.327-334. Any remarks send to A.Kryukov Institute for Nuclear Physics Moscow State University 119899, Moscow, RUSSIA E-mail: kryukov@npi.msu.su Phone/Fax: (095) 939-0397 Good luck!