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
This archive was generated by hypermail 2b29 : 06/19/19-07:00:05 AM Z CEST