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I A question about a Feynman Diagram

  1. Dec 27, 2017 #1
    Could somebody explain me this?: Why is the arrow of the electron-antineutrino pointed towards the W-boson and not as in the second picture upwards?

    [​IMG]
    200603-561b1be3b60e68d907c72417e7e94a26.png

    This is my first post and also haven't learned too much about physics yet so please if anything is unclear hit me up.
     

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  2. jcsd
  3. Dec 27, 2017 #2

    Vanadium 50

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    Because somebody drew it backwards.
     
  4. Dec 27, 2017 #3
    The one that is drawn on is mine. The correct one should be the other one
     
  5. Dec 28, 2017 #4

    Vanadium 50

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    Then you drew it backwards.

    The arrows indicate particle/antiparticle, not direction of motion.
     
  6. Dec 28, 2017 #5
    So if i get it right: If a W- boson decays like here the output will be an electron-antineutrino and an electron?
     
  7. Dec 28, 2017 #6
    Oh and another question, this picture is about muon capture but it isn't right is it? First of all there are no anti-leptons so it can't be right: L=1+1=2 second of all the muon isnt an antimuon so the arrow should be the other way around, shouldn't it?
    [​IMG]
     

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