Quantum Field Theory

Written as a basic introduction to quantum field theory, this book explains the basic physics and formalism behind the theory, covers theory calculations using Feynman diagrams, and introduces the reader to gauge theories, which play such a central role in elementary particle physics. To help students fully understand this subject, mathematical formalism is developed from first principles, its physical interpretation is stressed at every point, and its use is illustrated in detailed applications. Chapters on electroweak interactions have also been reworked and include new material such as Majorana neutrinos.