Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
     

    Attached Files:

  2. jcsd
  3. Dec 27, 2017 #2

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    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

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2017 Award

    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]
     

    Attached Files:

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted