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Andrew

Andrew Lifson

Affiliated

Andrew

Simplifying QCD event generation with chirality flow, reference vectors and spin directions

Author

  • Emil Boman
  • Andrew Lifson
  • Malin Sjodahl
  • Adam Warnerbring
  • Zenny Wettersten

Summary, in English

The chirality-flow formalism, combined with good choices of gauge reference vectors, simplifies tree-level calculations to the extent that it is often possible to write down amplitudes corresponding to Feynman diagrams immediately. It has also proven to give a very sizable speedup in a proof of concept implementation of massless tree-level QED in MadGraph5_aMC@NLO. In the present paper we extend this analysis to QCD, including massive quarks. We define helicity-dependent versions of the gluon vertices, derive constraints on the spinor structure of propagating gluons, and explore the Schouten identity to simplify the four-gluon vertex further. For massive quarks, the chirality-flow formalism sheds light on how to exploit the freedom to measure spin along any direction to shorten the calculations. Overall, this results in a clear speedup for treating the Lorentz structure at high multiplicities.

Department/s

  • Department of Physics
  • Particle and nuclear physics

Publishing year

2024-02

Language

English

Publication/Series

Journal of High Energy Physics

Volume

2024

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Automation
  • Chiral Lagrangian
  • Specific QCD Phenomenology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479