Implementing the chirality-flow formalism for tree-level massless QCD in MadGraph

Sammanfattning: The chirality-flow formalism provides a simple but efficient way to rewrite and evaluate Feynman diagrams and has recently been shown to also optimize automated numerical scattering matrix element evaluations in massless tree-level QED. In this thesis we extend the numerical QED model to massless tree-level QCD in the MadGraph5_aMC@NLO framework. It is shown that a good gauge choice for external gluons lead to significant simplifications of the kinematics, and a set of gauge-specific rules for Feynman diagram generation are presented. The evaluation time for kinematic calculations in matrix element evaluations are compared to standard MadGraph, demonstrating a speed improvement of 1.5-3 times in our implementation, increasing with increasing multiplicity.