Jet Clustering and Merging Scale Parameters Questions
Hello,
I am currently wanting to run an inclusive dijet production at NLO using madgraph 5 v 2.7.2 and I am showering with PYTHIA8. The specific process I'm running is
p p > j j j [QCD]
My question pertains to the jet merging and clustering set up. It says on the madgraph website to use ickkw = 1 for MLM merging and ickkw = 2 for CKKW merging. However my version of madgraph only offers FXFX merging (ickkw =3), UNLOPS merging (ickkw = 4), and NNLL+NLO jet-veto computation (ickkw = -1). I have noticed that none of these are compatible with the anti-kt jet algorithm, only the kt jet algorithm. Is FXFX merging with the kt algorithm the best way to go about jet matching for inclusive dijets, or should I download a different version of madgraph to obtain MLM merging?
I was also wondering about the merging scale parameter in the showering process. I am using minimum transverse jet momentum (ptj) of 25 GeV, and I read on another madgraph forum that your merging scale should be about 20% higher than your pt min set for jets, but this was for e+e- collisions. Is this true for pp collisions as well? I couldn't find much information on merging scales and their function.
Thanks in advance for any help, and I apologize if these questions are amateurish.
-Zach Warner
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