  We present a new color decomposition for QCD amplitudes at one-loop level as
a generalization of the Del Duca-Dixon-Maltoni and Johansson-Ochirov
decomposition at tree level. Starting from a minimal basis of planar primitive
amplitudes we write down a color decomposition that is free of linear
dependencies among appearing primitive amplitudes or color factors. The
conjectured decomposition applies to any number of quark flavors and is
independent of the choice of gauge group and matter representation. The results
also hold for higher-dimensional or supersymmetric extensions of QCD. We
provide expressions for any number of external quark-antiquark pairs and
gluons.
