Quantum Field Theory
19 Perturbation Theory to All Orders (18) 133 20 Two-Particle Elastic Scattering at One Loop (19) 135 21 The Quantum Action (19) 139 22 Continuous Symmetries and Conserved Currents (8) 144 23 Discrete Symmetries: P, T, C, and Z(22) 152 24 Nonabelian Symmetries (22) 157 25 Unstable Particles and Resonances (14) 161 26 Infrared Divergences (20) 167
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