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Inspired by the flow description of su(N) colour calculations, we recentlyshowed how to simplify the spinor-helicity formalism (at the algebra level twocopies of complexified su(2)) by treating each Weyl spinor as part of a flowline with definite chirality and momentum. This formalism, dubbed thechirality-flow formalism, eliminates all non-trivial algebra from tree-levelspinor-helicity calculations, thus allowing the shortest possible route fromFeynman diagrams to complex numbers (spinor inner products). In thispresentation, we briefly introduce the main features of this method and showsome examples.

A Brief Look at the Chirality-Flow Formalism for Standard Model Amplitudes