Diagrammatica

This book provides an easily accessible introduction to quantum field theory via Feynman rules and calculations in particle physics. the aim is to make clear what the physical foundations of present-day field theory are to clarify the physical content of Feynman rules and to outline their domain of applicability. The book begins with a brief review of some aspects of Einstein's theory of relativity that are of particular importance for field theory before going on to consider the relativistic quantum mechanics of free particles interacting fields and particles with spin.