Color decomposition of multi-quark one-loop QCD amplitudes
In this talk we discuss the color decomposition of tree-level and one-loop QCD amplitudes with arbitrary numbers of quarks and gluons. We present a method for the decomposition of partial amplitudes into primitive amplitudes, which is based on shuffle relations and is purely combinatorial [1]. Closed formulae are derived, which do not require the inversion of a system of linear equations.