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Photo of Andrew Lifson

Andrew Lifson

Doctoral student

Photo of Andrew Lifson

Automating scattering amplitudes with chirality flow

Author

  • Andrew Lifson
  • Malin Sjödahl
  • Zenny Wettersten

Summary, in English

Recently we introduced the chirality-flow formalism, a method which builds on the spinor-helicity formalism and is inspired by the color-flow idea in QCD. With this formalism, Feynman rules and diagrams are simplified to the extent that it is often possible to immediately, by hand, write down a helicity amplitude given a Feynman diagram. In this paper we show that the method can also speed up numerical evaluation of scattering amplitudes by considering e+e- going to n photons in a MadGraph-based tree-level implementation. We find that the computation time is reduced by roughly a factor ten for six photons, and that it scales better with the number of external particles than the default MadGraph5_aMC@NLO implementation. This performance gain is in part attributed to the more compact Lorentz structures involved, and in part due to a transparent choice of gauge reference vectors which reduces the number of Feynman diagrams considered.

Department/s

  • Theoretical Particle Physics

Publishing year

2022-06

Language

English

Publication/Series

European Physical Journal C

Volume

82

Issue

6

Document type

Journal article

Publisher

Springer

Topic

  • Other Physics Topics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1434-6044