Field Theory References
Lagrangians
 An Introduction to Quantum Field Theory by Peskin and Schroeder
 Section 15.1  Explains how to derive the QED Lagrangian from invariance principles
 Advanced Quantum Mechanics by Sakurai
 Section 3.4, 3.5  Explains why gamma matrices are needed to ensure Lorentz invariance
 Quantum Field Theory in a Nutshell by Zee
 Page 168  Explains that gauge invariance is not a real symmetry, but a reflection of the fact that Lorentz vectors are redundant for describing photons with only two physical degrees of freedom.
Particles
 Gauge Theories in Particle Physics by Aitchison and Hey (Third Edition)
 Section 2.2  Contains the YukawaWick argument that explains the connection between the range of a force and the mass of its propagator
 Quantum Field Theory by Ryder (Second Edition)
 Section 2.2, 2.3  Derives the KleinGordon equation and the Dirac equation and states that the former is for spin 0 and the latter is for spin 1/2.
Spin
 Modern Quantum Mechanics by Sakurai (Revised Edition)
 Section 3.2  Derives that spin operators are the generators of rotation
 Spin, Helicity and the Dirac Equation by Thomson (Class Notes)
 Shows explicitly where Weyl spinors come from
Representation Theory
 Lie Algebras in Particle Physics by Georgi
 In general it explains the mathematical side of representation theory
 Gauge Field Theories: An Introduction with Applications by Guidry
 Page 177  Operatorbased discussion of isospin
 Group Theory and Physics by Sternberg
 Good source of definitions
