7-12 June 2021
Europe/Paris timezone

The Chirality-Flow Formalism for Standard Model Amplitudes

Jun 10, 2021, 6:45 PM


Theory poster QCD physics Poster Session


Andrew Lifson (Lund University)


Scattering amplitudes are often split up into their gauge (su(N)) and kinematic (two copies of complexified su(2)) components. Since the su(N) gauge part is often calculated using flows of colour, it should similarly be possible to describe the su(2) $\oplus$ su(2) kinematics of an amplitude in terms of flows of chirality. In two recent papers (hep-ph:2003.05877 & hep-ph:2011.10075) we showed that this is indeed the case, introducing the chirality-flow formalism for Standard Model calculations. In the chirality-flow method (which simplifies the spinor-helicity method) Feynman diagrams can be directly written down in terms of Lorentz-invariant spinor inner products, allowing the simplest and most direct possible path from Feynman diagram to complex number. In this poster, I will introduce this method and show some examples.

Primary author

Andrew Lifson (Lund University)


Malin Sjodahl (Lund University) Dr Christian Reuschle (Lund University) Mr Joakim Alnefjord (Lund University)

Presentation materials