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Homework Help: Feynman diagaram of Kaon decay

  1. Dec 20, 2012 #1
    1. The problem statement, all variables and given/known data
    I am asked to draw a feynman diagram of [itex]K^- \rightarrow \mu \nu [/itex]

    2. Relevant equations
    [itex]K^-[/itex] consist of [itex]s\bar{u}[/itex]

    3. The attempt at a solution
    I wonder what the direcion of the arrows should be, my guess is something like the attached image.
    edit: Ah, where the left u shoudl be an s and the right u should be an antiup. (attached the wrong pic)

    Attached Files:

  2. jcsd
  3. Dec 21, 2012 #2


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    That decay can't happen, can it? Doesn't it violate lepton number conservation?
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