Improving colour computations in MadGraph5_aMC@NLO and exploring a 1 / Nc expansion

Andrew Lifson, Olivier Mattelaer

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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 multiplicity samples, even without truncating the colour matrix, the new implementation offers a speed gain compared to the previous MadGraph5_aMC@NLO code.

    Original languageEnglish
    Article number1144
    JournalEuropean Physical Journal C
    Volume82
    Issue number12
    DOIs
    Publication statusPublished - 2022 Dec

    Subject classification (UKÄ)

    • Subatomic Physics

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