Name: Francesco (email_not_shown)
Date: 11/15/17-12:59:48 PM Z

Hello,
I need to compute a 2->4 amplitude within a model I created.
In order to simplify the expression for the amplitude, is there a way to use the generalised Mandelstam variables like
s_{i1i2..i4}=(p_i1+...+p_i4)^2
and the others possible combinations?

thanks

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