# Feynman diagram

by hob
Tags: diagram, feynman
 P: 6 1. The problem statement, all variables and given/known data What observation of the process: (anti muon neutrino) + (electron) -> (anti muon neutrino) + (electron) constitutes unambiguous evidence for weak neutral currents, whereas the observation of (anti electron neutrino) + (electron) -> (anti electron neutrino) + (electron) 3. The attempt at a solution The solution is the first one: {www}.scribbleproductions.co.uk/stuff/fine1.jpg Since the second reaction can undergo via W+ as well as Z0: {www}.scribbleproductions.co.uk/stuff/fine2.jpg My question is in the Feynman diagrams, why could you not have this for example: An electron decaying to a muon neutrino ? {www}.scribbleproductions.co.uk/stuff/fine3.jpg Apparently the weak interaction also violates charge conservation, but I have never seen a possible reaction with a Feynman diagram that is violated at the vertices's. Many thanks for any help :)
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P: 2,948
 Quote by hob 1. The problem statement, all variables and given/known data What observation of the process: (anti muon neutrino) + (electron) -> (anti muon neutrino) + (electron) constitutes unambiguous evidence for weak neutral currents, whereas the observation of (anti electron neutrino) + (electron) -> (anti electron neutrino) + (electron) 3. The attempt at a solution The solution is the first one: {www}.scribbleproductions.co.uk/stuff/fine1.jpg Since the second reaction can undergo via W+ as well as Z0: {www}.scribbleproductions.co.uk/stuff/fine2.jpg My question is in the Feynman diagrams, why could you not have this for example: An electron decaying to a muon neutrino ? {www}.scribbleproductions.co.uk/stuff/fine3.jpg Apparently the weak interaction also violates charge conservation, but I have never seen a possible reaction with a Feynman diagram that is violated at the vertices's. Many thanks for any help :)
The weak interaction does NOT violate charge conservation! So your third diagram is impossible. Charge is always conserved
P: 6
 Quote by nrqed The weak interaction does NOT violate charge conservation! So your third diagram is impossible. Charge is always conserved
Thanks for that, I was a bit uneasy to see charge violation.

Does weak violate anything to do with charge? I remember seeing something about charge violation that only the weak does not strong or e.m

Regards,

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