Different cross section calculated in two versions
Dear all,
accidentally, I have found a big difference in the cross section of some interactions calculated with two versions of the CalcHEP code. For example, the total cross section for the interaction u,ne->u,u,U,ne is calculated as ~145 and ~6.8 pb at p=100 GeV in the code version 3.7 (Apr 28, 2018) and 3.7.5 (Apr 23, 2019), respectively. Interestingly, the number of Feynman and squared diagrams is the same in both versions. The same initial conditions, operating system and computer were used in both calculations.
I would be interested to learn what code change causes this difference and what version of the code gives correct result for this type of interactions.
Best regards,
Westley
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