# A Course in Amplitudes

## TL;DR

This paper provides a pedagogical overview of scattering amplitudes in gauge theories, covering foundational concepts and recent developments like recursion relations and unitarity cut methods in ten comprehensive lectures.

## Contribution

It offers an accessible introduction to on-shell methods, integrating classical and modern techniques in scattering amplitude calculations.

## Key findings

- Explains recursion relations of Britto, Cachazo, Feng, and Witten.
- Describes unitarity cut method by Bern, Dixon, Dunbar, and Kosower.
- Provides a structured educational approach to amplitude methods.

## Abstract

This a pedagogical introduction to scattering amplitudes in gauge theories. It proceeds from Dirac equation and Weyl fermions to the two pivot points of current developments: the recursion relations of Britto, Cachazo, Feng and Witten, and the unitarity cut method pioneered by Bern, Dixon, Dunbar and Kosower. In ten lectures, it covers the basic elements of on-shell methods.