The chirality-flow formalism
arXiv:2003.05877 · doi:10.1140/epjc/s10052-020-8260-8
Abstract
We take a fresh look at Feynman diagrams in the spinor-helicity formalism. Focusing on tree-level massless QED and QCD, we develop a new and conceptually simple graphical method for their calculation. In this pictorial method, which we dub the chirality-flow formalism, Feynman diagrams are directly represented in terms of chirality-flow lines corresponding to spinor inner products, without the need to resort to intermediate algebraic manipulations.
44 pages, 3 figures; Version accepted by EPJC. Minor typo corrections