Interaction by Particle Exchange and QED
Elementary Particle Physics:
theory and experiments
Prof. dr hab. Elżbieta Richter-Wąs
Follow the course/slides from M. A. Thomson lectures at Cambridge University
Recap
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Interaction by Particle Exchange
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Feynman diagrams
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Virtual Particles
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Aside: V(r) from Particle Exchange
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Quantum Electrodynamics (QED)
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Feynman rules for QED
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Basic rules for QED
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Summary
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Electron-positron annihilation
QED calculations
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Electron Positron Annihilation
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Electron and Muon Currents
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Spin in e+e- Annihilation
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The muon current
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Electron Positron Annihilation cont.
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The electron current
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Matrix element calculation
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Differential cross-section
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Spin considerations (E >> m)
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Lorentz Invariant form of Matrix Element
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Chirality
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Chirality in QED
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Allowed QED Helicity Combinations
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Summary
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Appendix: Spin 1 Rotation Matrices
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