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Can quarks change flavor through lepton exchange?

Can quarks change flavor through lepton exchange?

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Answer #1

No, quarks cannot change flavour through lepton exchange, because leptons are not exchange particles. Leptons are not exchanged in any interaction.

Quarks can change flavour in a weak interaction in which leptons may be involved but W bosons are exchanged in such an interaction, not leptons.

For example, consider beta-plus decay process:

here one quark changes its flavour from up (u) to down (d). And there are leptons (positron and electron-neutrino) involved but the leptons are not what is exchanged. A W+ boson is exchanged in the beta plus decay. Here is the Fyneman diagram of the beta-plus decay:

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