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A powerful tool for calculations in non-Abelian gauge theories is obtained bycombining the background field gauge, the helicity basis and the colordecomposition methods. It has reproduced the one-loop calculation of thefive-gluon amplitudes in QCD, is applicable to electroweak processes andextendable to two-loop calculations.Comment: Latex 22 pages, 3 figure

Technique for loop calculations in non-Abelian gauge theories with applications to a five gluon amplitude