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currently I work on 2->3 scattering process. So there exist five external momenta and in my case 5 different Feynman diagrams, for which I have already calculated the full matrix element.

The matrix element is a function of various scalar products of the four-momenta. This scattering contains quarks. My next aim is to calculate the hadronic cross section from the matrix element.

Can someone explain me how can I do this?

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# From matrix element to hadronic cross section

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