Understanding Cutkosky's Rules for Bhabha Scattering and the Optical Theorem

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SUMMARY

This discussion focuses on Cutkosky's Rules as applied to Bhabha scattering and the derivation of the optical theorem. It establishes that when cutting Feynman diagrams, the resulting segments are complex conjugates, leading to the relationship 2ImM(s) = M.M*. The conversation also addresses the calculation of Feynman diagrams with two loops sharing a common propagator, emphasizing the application of Cutkosky's rules in such scenarios where three propagators are involved.

PREREQUISITES
  • Understanding of Feynman diagrams and their components
  • Familiarity with Bhabha scattering processes
  • Knowledge of complex analysis in quantum field theory
  • Experience with the optical theorem and its implications
NEXT STEPS
  • Study the derivation of the optical theorem in quantum field theory
  • Learn about advanced techniques for calculating multi-loop Feynman diagrams
  • Explore the implications of Cutkosky's rules in different scattering processes
  • Investigate the role of common propagators in loop diagrams
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Particle physicists, quantum field theorists, and students studying advanced scattering processes in high-energy physics.

ndung200790
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Please teach me this:
When we use cutting rule for Bhabha scattering to cut the Feymann diagram to parts.Why we know the two parts are complex conjugation of each other,so we have optical theorem:
2ImM(s)=... M.M*...
Thank you very much in advanced
 
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How to calculate Feymann diagram with two loops which have common propagator(a common segment of diagram).And how to use cutting rule(Cutkosky's rules) those two loops(It seem to me that in this case there are 3 propagators being cut in the two loops because there is common one)?
 

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