How should I be generating the LO and NLO parts of pp> H + jets for merging with Pythia?
My goal is to generate samples of p p > H + jets (in the regime of high Higgs transverse momentum), and to use merging schemes such as UNLOPS in Pythia on the data. The pythia page suggests that I generate "a) leading-order inputs generated with the leading-order mode of aMC@NLO, using the UNLOPS prescription, and b) next-to-
I have been trying to get a working setup for a while but have been unable. My plan was to try generating p p > H j at NLO, and p p > H j j @LO, then use UNLOPS to merge the two. But if I try the command:
p p > H j [QCD]
this doesn't actually generate at NLO, because there are no tree level diagrams in the first place, so when I subsequently launch the process it isn't using aMC@NLO, but rather just madgraph (what I mean by that is if for example I look at the run card, it is labelled as run_card.dat Madevent and not run_card.dat aMC@NLO, so for the ickkw option that controls the merging, there is no option for UNLOPS)
Is it sensible to just do a LO scheme like MLM in this case? I seem to be getting the wrong cross-sections for now when I try LO matching but that might just be my code not up to scratch
Thanks for any help
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