Improving colour computations in MadGraph5_aMC@NLO and exploring a 1 / Nc expansion
In this paper, we present an extension of MadGraph5_aMC@NLO which is able to evaluate tree-level QCD matrix-elements up to 2 → 6 (one more particle than before). To achieve this, we implemented Berends–Giele-like recursion, and re-implemented the way colour is computed such that we can now expand the colour matrix in powers of 1 / Nc and truncate this expansion to a chosen order. For high multipli
