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Fermion decay

  1. May 20, 2015 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    I've started from writing out the amplitude. Here I know that fermion has definite helicity so I can't sum over spins but I should input explicit forms of spinors. Am I correct? How to do this?
    I would be grateful for helping me with this step. I'll manage the rest of the problem.
  2. jcsd
  3. May 20, 2015 #2


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    You insert the expression for a spinor of the appropriate spin. It should be described in your textbook how such a spinor looks.
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