Jet matching/merging & DJR analysis with pythia8
Hi
I'm working on DJR plots from hepmc file generated by py8, to find the proper value for xqcut however I can not see 0 jet event domination separated from 1,2,3,4 jet events in DJR1 for instance. I'm having 0,1,2 jet events having more or less the same curve and 3,4 jet events are slightly separated. On the other hand when I do exactly the same thing with pythia6 I got exact same plots done in TASI Lectures 2013 (https:/
generate p p > l+ l- @0
add process p p > l+ l- j @1
add process p p > l+ l- j j @2
add process p p > l+ l- j j j @3
add process p p > l+ l- j j j j @4
(same with neutrinos but to get more precision I generated them separately and generated 25000 events each also tau included)
changes on run_card:
1 = ickkw
True = auto_ptj_mjj
50.0 = mmll
10.0 = xqcut
in pythia8 I used main89 with mlm comand file:
Main:numberOfEvents = 50000
Beams:frameType = 4
JetMatching:merge = on
JetMatching:scheme = 1
JetMatching:setMad = off (I also tried with on but nothing changed)
JetMatching:qCut = 10.0
JetMatching:
JetMatching:
JetMatching:nJetMax = 4
JetMatching:
Check:epTolErr = 1e-2
LHEFInputs:nSubruns = 2
Main:subrun = 0
Beams:LHEF = <l+l- events PATH>/unweighte
Main:subrun = 1
Beams:newLHEFsa
Main:LHEFskipInit = on
Beams:LHEF = <vl vl~ event PATH>/unweighte
in ma5:
./bin/ma5 -H
submset main.merging.check = true
submset main.merging.njets = 4
import <PATH>/
submit
Note that I also tried to use 'set main.merging.
Also py8 generates only around ~14000 hepmc events where I'm giving 50000 event in total from lhe files.
Am I doing something wrong in pythia_card because there shouldn't be that much difference between py6 and py8 I believe.
Thank you very much
Best regards
Jack
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- Stefan Prestel Edit question
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