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It is always a problem when the students want to attack a more complex problem that needs numerical integrations, like the three body decays. In normal textbooks this part it is normally not covered and, at most, is left as an exercise. My experience is that, for the first time, the students need some help. In this section we review the integration of three body phase space. We explain in detail the necessary steps to use two packages for the three body phase space for cross sections as well as for decays. These packages can be downloaded from my web page
They are explained in the this paper, which serves as a sort of manual.