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Trace of gamma matrices with FORM

  1. May 15, 2007 #1
    Hello everybody,
    I have to calculate the matrix element of the process gg-->ttbar-->lnub lnub (ttbar dileptonic decay) using FORM.
    I have three feynman dyagrams for such a process. When I calculate the interference term i have as output thousands of terms with Levi civita tensors inside (but with the indeces correctly contracted). I have already used the "symmetrize" option as explained in the tutorial
    but it doesn't work.
    Can someone help me?
    It is the first time in this forum, i do not know exactly how it works, so i leave my email
    Thanks a lot
  2. jcsd
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