A proper way to choose a minimum DeltaR cut in case of parton showering
Dear MadGraph experts,
I want to use MadGraph events as an input for a parton shower event generator.
And my question is how to choose properly "distance between jets" cut in MG run card?
For example I produce parton events for a process p p > 4 jests where jets consist of massless quarks.
If I understand it correctly I have to imposed dR_min cut, otherwise I may run into numerical problems related to collinear IR divergences.
Now after performing parton showering I need to run a jet reconstruction algorithm, so I have to choose a jet radius R
(as an input parameter for a FastJet reconstruction algorithm)
Now I am getting confuse because if I understand it properly the dR_min parameter in MG run card has nothing to do with jet radius R. Moreover a total MG cross section depends on the chose of dR_min so it may affect my jet distributions.
So my questions are:
Thank you,
with best regards,
Oleh
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