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It's a pity that the Feynman diagram at the top is not the diagram of the disintegration they are discussing. IIUC this are the correct diagram https://www.caen.it/na62-spots-two-potential-instances-of-ra... .

The Kaon disintegrates into a Pion, a neutrino and an antineutrino. This process is rare because you need two virtual Z or W particles in the intermediate steps of the decay.

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