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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

http://www.nikhef.nl/~form/maindir/documentation/documentation.html

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

cavaller[at]lpnhe[dot]in2p3[dot]fr

Thanks a lot

Pierrechevalier

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# Trace of gamma matrices with FORM

Can you offer guidance or do you also need help?

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