Simplifying events with chirality flow, reference vectors, and spin axes

by Zenny Jovi Joestar Wettersten (CERN), Zenny Wettersten (Lund University)

Monday 15 Jan 2024, 11:00 → 12:30 Europe/Zurich

Aula Caldirola (Universita` di Milano)

Abstract:

The chirality-flow formalism provides a flow-based approach for evaluation of kinematic scattering amplitudes without any of the matrix algebra of standard Lorentz structure treatment. Combining this with the generally unused degrees of freedom related to gauge reference vectors of gauge bosons and spin axes of massive fermions, Feynman diagram methods such as the helicity amplitudes used in e.g. MadGraph5_aMC@NLO can be simplified significantly. Here, we provide a brief introduction to chirality flow alongside results from a recent numerical implementation for (massive) tree-level QCD, where amplitude evaluation complexity is reduced by roughly a factor three for large multiplicities.