Uploaded May 2019 | Updated September 2026, 4 hours ago
In this video, I show you how to derive the scattering cross section general formulas in quantum field theory.
My Quantum Field Theory Lecture Series:
youtube.com/playlist?list=PLSpklniGdSfSsk7BSZjONcfhRGKNa2uou
Superfluid Helium Resonance Experiment video:
youtu.be/unUNQNmuvUQ
Note:
In the limit that the f(k)-functions go to the delta functions that fix the averages, k-bar, to be the exact momentum (i.e. the limit of plane wave incoming particles that therefore have specific momenta), the formulas given here become exact, because the rough equalities given at 19:22 become exact. This limit is what's consistent with the derivation of the standard Feynman rules. Therefore, these formulas taken exactly are compatible with the standard Feynman rules.
In this video, I show you how to derive the scattering cross section general formulas in quantum field theory.
My Quantum Field Theory Lecture Series:
youtube.com/playlist?list=PLSpklniGdSfSsk7BSZjONcfhRGKNa2uou
Superfluid Helium Resonance Experiment video:
youtu.be/unUNQNmuvUQ
Note:
In the limit that the f(k)-functions go to the delta functions that fix the averages, k-bar, to be the exact momentum (i.e. the limit of plane wave incoming particles that therefore have specific momenta), the formulas given here become exact, because the rough equalities given at 19:22 become exact. This limit is what's consistent with the derivation of the standard Feynman rules. Therefore, these formulas taken exactly are compatible with the standard Feynman rules.
