Doubts regarding updating a propagator in UFO
Hello,
I have tried to modify the form of the fermionic propagator in the propagator.py file and the compilation is done in Madgraph without any error.
1. But, there is a compilation error after using absolute within the argument of sqrt appearing in the form of the propagator to avoid complex outputs. I have used the "abs(x)" command to get the absolute value of x. Is there any other specific way to get an absolute value in general in Madgraph?
2. Additionally, is there any chance of getting any unwanted zero or infinity from the form of fermionic propagator itself (mentioned below) resulting in "Error in matrix element" from Madgraph?
fermionic propagator form : \slashed{p} + m / ((p^2 - m^2) + i * b(p)) where b(p) is ensured to be real over any value of momentum
Thanks,
Rohan
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