Interaction by particle exchange and QED Electron-positron annihilation
Detectors for HEP: ATLAS at LHC
Elementary Particle Physics:
theory and experiments
Prof. dr hab. Elżbieta Richter-Wąs
Some slides taken from M. A. Thomson lectures at Cambridge University in 2011
Interaction by particle exchange and QED
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Recap
Lecture 2
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In this Lecture will
Interaction by particel exchange
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Feynman diagrams
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Virtual particles
Aside: V(r) from particle exchange
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Quantum Electrodynamics (QED)
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Virtuality in t-channel, not a charge!
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Feynman rules for QED
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
Spin in e+e- annihilation
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The muon current
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Electron-positron annihilation cont.
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 ME
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Chirality
Chirality
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Chirality in QED
Allowed QED helicity combinations
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Summary
Detectors for high energy physics (ATLAS at LHC)
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