Feynman Rules for Tree Graphs in QCD and the Electroweak Theory
I. J. R. Aitchison, Anthony J.G. Hey · 2024
The SU(3) colour degree of freedom is not written explicitly; the spinors have 3 (colour) × 4 (Dirac) components. For each fermion or antifermion line entering the graph include the spinor Q.1 https://www.w3.org/1998/Math/MathML" display="block"> u ( p , s ) o r v ( p , s ) https://www.w3.org/1999/xlink" xlink:href=" https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003411666/5ac5716b-121a-4dab-8edb-836faf7ea676/content/mathQ_1.tif "/>