Introducing the Chirality-Flow Formalism for Standard Model calculations
Andrew Lifson
Lund University
Tue, Mar. 16th 2021, 16:00
(voir dans annonce),

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 and 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 talk, I will introduce this method and show some examples. \\ \\ The seminar is on zoom only: \\ https://cern.zoom.us/j/65900098638?pwd= \\ SkY1RHhrQUVRcWhjQ3VsbTV4TG5XQT09