L4.6 QED: Examples | Summary and Q&A

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June 24, 2021
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L4.6 QED: Examples

TL;DR

This video lecture introduces an example of the QED process and explains the calculation of matrix elements' transition amplitude.

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Questions & Answers

Q: What is the QED process?

The QED process stands for Quantum Electrodynamics, which is a theoretical framework that describes the interaction between charged particles and electromagnetic fields.

Q: Why is muon-electron scattering chosen as the example for studying QED processes?

Muon-electron scattering is chosen as it represents a simple case with only one leading-order diagram, making it easier to understand the calculation of matrix elements' transition amplitude.

Q: What is the purpose of considering multiple diagrams in electron-electron scattering?

In electron-electron scattering, multiple diagrams need to be considered because the outgoing electron leg is changed in some diagrams, requiring the calculation of additional diagrams to accurately represent the process.

Q: What are some examples of other QED processes?

Other examples of QED processes include electron-positron scattering, Bhabha scattering, Compton scattering, pair annihilation, and pair production. Each process involves different interactions and diagrams.

Summary & Key Takeaways

  • The lecture discusses different examples of QED processes, including elastic scattering, muon-electron scattering, electron-electron scattering, electron-positron scattering, Bhabha scattering, Compton scattering, pair annihilation, and pair production.

  • Muon-electron scattering is chosen as the simplest case to study, with only one leading-order diagram.

  • The Feynman diagram is used to calculate the matrix element by following Feynman rules, analyzing vertex vectors, considering propagators, and integrating over momentum.

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