Feynman Diagrams

TL;DR

This paper provides a clear, educational overview of Feynman diagrams, covering basic concepts, derivation of rules, and modern computational techniques for tree and loop diagrams in quantum field theory.

Contribution

It offers a pedagogical introduction and modern computational methods for Feynman diagrams, suitable for both beginners and advanced researchers.

Findings

Simplified derivation of Feynman rules from Lagrangian

Introduction to computational techniques for diagrams

Application to relativistic quantum field theory

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.