Both of these are second-order weak interactions, as I've mentioned before. They show the strangeness oscillations I mentioned previously, but it turns out to be way easier to calculate how much oscillation there by converting between strangeness and CP eigenstates. I still find the Feynman diagrams useful, though, since they give a concrete physical way for the strangeness of a kaon beam to evolve, in addition to the somewhat abstract mathematical approach.
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