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Quantum Electrodynamics - School of Physics and Astronomy

Quantum Electrodynamics Outline Outline classical versus Quantum Theory Force/interaction mediated by exchange of field quanta Virtual Particles Propagator Feynman Diagrams Feynman Rules Matrix Elements Cross sections Electromagnetic vertex Coupling strength Coupling constant Conservation laws QED processes Electron-proton scattering Electron-positron annihilation Higher order Diagrams Precision QED tests Running of alpha Dirac Equation Appendix Nuclear and Particle Physics Franz Muheim 1. Quantum Electrodynamics Quantum Theory (QED). of Electromagnetic Interactions classical Electromagnetism Forces arise from Potentials V(r). act instantaneously at a distance QED Picture Forces described by exchange of virtual field quanta - photons Propagator Matrix element Full derivation in 2nd order perturbation theory Gives propagator term 1/(q2 - m2) g2.

Quantum Electrodynamics Quantum Theory (QED) of Electromagnetic Interactions Classical Electromagnetism Forces arise from Potentials V(r) act instantaneously at a distance QED Picture Forces described by exchange of virtual field quanta - photons Matrix element Full derivation in 2nd order perturbation theory Gives propagator term 1/(q2-m2)

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