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I was reading the "Weak Hamiltonian, CP Violation and Rare Decays" by Andrzej J. Buras and, in the page 57 I don't understood how he calculate the effective Feynman diagrams for to get the effective operators. Can someone give me a hint?

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    $\begingroup$ You might consider reading Schwartz (QFT & the Standard Model) chapters 33 through 36, or Weinberg vol 2 chapter 16, Srednicki chapter 29, and Peskin & Schroeder chapter 11 $\endgroup$
    – TLDR
    Commented Apr 13, 2022 at 18:43

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