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Quark-Gluon Feynman Diagrams

  1. Jan 31, 2013 #1
    Hi all. I am new here but i decided to work a bit more and finish my diploma faster so i think i will use this forum more from now on.

    I was studing about quark color changes, quark interactions, gluons and generally the strong force. As i saw the Feynman diagrams i felt a bit confused.

    What are the laws in order to know which gluon is emmited each time? For example in my first pic why is this a green-antiblue gluon and not a blue-antigreen?

    In the second picture how do i know its 1/√6(RR+GG-2BB) and not 1/√2 (RR+BB) for example?

    And in the knots again how do i found those numbers?

    Thanks for your time!
     

    Attached Files:

  2. jcsd
  3. Jan 31, 2013 #2

    Hepth

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    Gold Member

    The color should flow, so in the first the blue antiparticle is like an antiblue particle. And the green just flows forward.
     
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