How to calculate Feynman amplitude in Fish diagram

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  • #1
Alpha2021
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I am familiar with the process of calculating cross sections using tree-level Feynman diagrams. Currently, I'm keen on learning how to calculate the Feynman amplitude for a specific diagram displayed in the attached images. I'm wondering if there are any study materials available that offer a step-by-step approach to comprehending and calculating this particular process. Specifically, I'm interested in cases where x_3 and x_4 can be either scalar, fermion, or gauge boson particles.
hqbc.jpg
vqvxq.jpg
 
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  • #2
Any QFT book, like Srednicki or Peskin & Schroeder
 
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