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Particle Interactions, proton + antiproton

  1. Mar 31, 2015 #1
    Quite a simple query really,

    The question wants me to draw a Feynman diagram for a number of particle interactions, some are not possible, some are.

    This interaction:

    proton + antiproton ----> 3 gamma

    This would require each quark (uud) to annihilate with its anti matter counter part. This is fine, but this produces gluons not photons. I know these gluons can decay into particles, and they could then maybe annihilate into photons.

    Is this interaction, as it's stated, possible to be demonstrated using Feynman diagrams?
     
  2. jcsd
  3. Mar 31, 2015 #2

    Orodruin

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    Not necessarily, quarks have electromagnetic charge and therefore also couple to photons.
     
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