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Feynman Diagrams: Weak Interaction Help
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[QUOTE="Chopin, post: 4353641, member: 274838"] Charge conservation happens at every vertex. You have a neutron coming in on the left, which is charge 0. A proton exits, which is of charge +1, so the boson must have charge -1 in order for things to balance. So you know it must be a W-. It then decays into an electron (charge -1), and an electron antineutrino (charge 0), meaning that charge is conserved at that vertex as well. It wouldn't make sense for the proton-neutron vertex to give off a W+ or a Z, because then the total charge wouldn't be conserved. Similarly, it wouldn't make sense for the W- to decay into a positron + electron neutrino, for the same reason. [/QUOTE]
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