Feynman diagram

  1. hob

    hob 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 :)
     
  2. jcsd
  3. nrqed

    nrqed 3,074
    Science Advisor
    Homework Helper

    Chegg
    The weak interaction does NOT violate charge conservation! So your third diagram is impossible. Charge is always conserved
     
  4. hob

    hob 6

    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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