Comment 5 for bug 1807699

Hi Olivier,

thanks for your quick answer.
As I understand this is an inherent problem of the phase space integrator. I'm afraid that the "solution [...] to simplify the model to avoid to have ANY three-point Feynman diagram" is only viable using restrictions if one also removes all SM interactions from the SMEFT. I tried naively setting as, Gf and aEW to zero but that didn't work because these parameters are used to calculate others which then causes "division by zero". Hence, it seems to me one would have to generate an entirely new UFO file using FeynRules where the Lagrangian contains only the four-fermion interaction of interest. The other option is of course to go via |dim6|^2 = |sm+dim6|^2 - |sm|^2 - 2Re(sm*dim6cc). Now I just have to find out what is more practical for me.

Thanks, Olivier, for your help.

Best wishes,
Peter