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I Neutrinos interact with photon in "level tree"?

  1. May 10, 2017 #1
    i found reading the possible interaction of neutrinos with photons to not "level tree", what's the meaning of level tree? and how is that posibble ?
     
  2. jcsd
  3. May 10, 2017 #2

    mfb

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    2016 Award

    Staff: Mentor

    Tree level, not level tree.
    It means without loops in a Feynman diagram. A tree does not have loops.
     
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