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If I understand correctly your answer there are two confusions going on here. The first is that in the calculation of the tree matrix element for the $e^+e^-\to \mu^+\mu^-$ reaction there are actually no fermionic propagators involved. You can see it already in the expression for $iM$ that you provided. The only propagator involved (inverse powers of momenta,...


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I remember reading that reactions that involve quarks of different generations have lower probability of occuring but they mentioned this in the context of the weak interaction. Flavor changing goes through the weak interaction. Does the same still hold in reactions where kaons are produced via the strong interaction such as in nucleon collisions? If ...


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