Feynman Diagrams

Abstract

We give a concise and pedagogical introduction to Feynman diagrams. After discussing a toy model which requires only undergraduate mathematics, we focus on relativistic quantum field theory. We review the derivation of Feynman rules from the Lagrangian of the theory and we discuss modern methods to compute tree and loop diagrams.

Comments: 11 pages, invited article for the Encyclopedia of Particle Physics. arXiv admin note: text overlap with arXiv:2201.03593