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

Feynman diagram K decay

  1. May 28, 2012 #1
    Looking at, say, the decay [itex]K^+ \to \pi^+ + \pi^+ + \pi^- + \gamma[/itex], is it easy to say what the Feynman diagram is of highest contribution? I suppose it is not unique, but say we're satisfied with just one of highest order. Is there as it were a sort of flowchart one follows? For example, since strangeness is not conserved, we'll at least need one weak interaction. This will increase the number of quarks from 2 to 4. We need 2 more, for this we can use any of the interactions, hence we use the strong interaction, as it has the highest contribution. To get an outgoing photon, it seems best to simply attach a photon line to an arbitrary fermion line already present. This gives me the following drawing
    attachment.php?attachmentid=47733&stc=1&d=1338244292.gif
    Firstly, is this drawing indeed one of the highest order contributions? Secondly, is the reasoning solid? Thirdly, do you use some kind of flowchart/algorithm/step-by-step procedure to find such things? Or perhaps it's all computers? Or random guessing...
     

    Attached Files:

  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted