hello, this is my first post here,
i am new to feyncalc
i want to write a program using feyncalc that evaluate the cross-section of a process (say, moller or bhabha) begining form the amplitude until the cross-section.
i used FermiuonSpinSum and i gor many errors and unwanted results.
please give me a .m file that do this .
thatnk you in advance
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