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import FWCore.ParameterSet.Config as cms
# Read in a LHE file from MadGraph5_aMC@NLO
herwigppLHEFileSettingsBlock = cms.PSet(
hwpp_LHE_Common = cms.vstring(
'create ThePEG::Cuts /Herwig/Cuts/NoCuts', # Use no cuts in shower step, just shower
'create ThePEG::LesHouchesInterface /Herwig/EventHandlers/LHEReader',
'set /Herwig/EventHandlers/LHEReader:Cuts /Herwig/Cuts/NoCuts', # No cuts while read in of LHE file
'set /Herwig/EventHandlers/LHEReader:MomentumTreatment RescaleEnergy',
'set /Herwig/EventHandlers/LHEReader:WeightWarnings 0', # Suppress weight warnings
'set /Herwig/EventHandlers/LHEReader:InitPDFs 0', # Explicitly set PDF of hard subprocess / Do not retrieve PDF from LHEReader
'create ThePEG::LesHouchesEventHandler /Herwig/EventHandlers/LHEHandler',
'insert /Herwig/EventHandlers/LHEHandler:LesHouchesReaders 0 /Herwig/EventHandlers/LHEReader',
'set /Herwig/EventHandlers/LHEHandler:WeightOption VarNegWeight', # Allow positive and negative event weight
'set /Herwig/EventHandlers/LHEHandler:PartonExtractor /Herwig/Partons/QCDExtractor',
'set /Herwig/EventHandlers/LHEHandler:CascadeHandler /Herwig/Shower/ShowerHandler',
'set /Herwig/EventHandlers/LHEHandler:HadronizationHandler /Herwig/Hadronization/ClusterHadHandler', # Switch Hadronization on
'set /Herwig/EventHandlers/LHEHandler:DecayHandler /Herwig/Decays/DecayHandler', # Switch Decay on
'insert /Herwig/EventHandlers/LHEHandler:PreCascadeHandlers 0 /Herwig/NewPhysics/DecayHandler', # Needed in 2.7, must be removed in 3.0
'set /Herwig/Generators/LHCGenerator:EventHandler /Herwig/EventHandlers/LHEHandler', # Activate LHEHandler
'set /Herwig/Shower/Evolver:MaxTry 100', # Try to shower an event maximum 100 times
'set /Herwig/Shower/Evolver:HardVetoScaleSource Read', # Read event to define hard veto scale
'set /Herwig/Shower/KinematicsReconstructor:ReconstructionOption General',
'set /Herwig/Shower/KinematicsReconstructor:InitialInitialBoostOption LongTransBoost',
'+hwpp_MECorr_Common', # Switch off ME corrections
# Or at least require that the user chooses a MECorrection option
),
# Showering MadGraph5_aMC@NLO LHE files: The same PDF for the hard subprocess and the shower must be used
hwpp_LHE_MadGraph = cms.vstring(
'+hwpp_LHE_Common',
'set /Herwig/EventHandlers/LHEReader:PDFA /Herwig/Partons/cmsPDFSet', # Shower PDF defined by HerwigppPDF_
'set /Herwig/EventHandlers/LHEReader:PDFB /Herwig/Partons/cmsPDFSet',
),
# Showering LO MadGraph5_aMC@NLO LHE files with a different PDF for the hard subprocess
############ WARNING ######
# This option should only be used with LO MadGraph5_aMC@NLO LHE files.
# In case of NLO, MC@NLO matched LHE files this results most likely in a mismatch of phase space
############ WARNING ######
# The shower pdf is the standard PDF which one can get including a predefined PDF using HerwigppPDF_
# The additional pdf of the hard subprocess is also predefined in HerwigppPDF_. However it has the additional suffix _Hard
# E.g. hwpp_pdf_NNPDF30NLO shower pdf, hwpp_pdf_NNPDF30NLO_Hard hard subprocess pdf
hwpp_LHE_MadGraph_DifferentPDFs = cms.vstring(
'+hwpp_LHE_Common',
'set /Herwig/EventHandlers/LHEReader:PDFA /Herwig/Partons/cmsHardPDFSet', # Hard subprocess PDF defined by HerwigppPDF_
'set /Herwig/EventHandlers/LHEReader:PDFB /Herwig/Partons/cmsHardPDFSet',
),
# Additional common block for Powheg
hwpp_LHE_Powheg_Common = cms.vstring(
'+hwpp_LHE_Common',
'set /Herwig/Shower/Evolver:HardVetoMode Yes', # Treat hardest emission differently
'set /Herwig/Shower/Evolver:HardVetoReadOption PrimaryCollision',
),
# Showering Powheg LHE files with the same PDF for the hard subprocess and the shower
hwpp_LHE_Powheg = cms.vstring(
'+hwpp_LHE_Powheg_Common',
'set /Herwig/EventHandlers/LHEReader:PDFA /Herwig/Partons/cmsPDFSet', # Shower PDF defined by HerwigppPDF_
'set /Herwig/EventHandlers/LHEReader:PDFB /Herwig/Partons/cmsPDFSet',
),
# Showering Powheg LHE files with a different PDF for the hard subprocess
# The shower pdf is the standard PDF which one can get including a predefined PDF using HerwigppPDF_
# The additional pdf of the hard subprocess is also predefined in HerwigppPDF_. However it has the additional suffix _Hard
# E.g. hwpp_pdf_NNPDF30NLO shower pdf, hwpp_pdf_NNPDF30NLO_Hard hard subprocess pdf
hwpp_LHE_Powheg_DifferentPDFs = cms.vstring(
'+hwpp_LHE_Powheg_Common',
'set /Herwig/EventHandlers/LHEReader:PDFA /Herwig/Partons/cmsHardPDFSet', # Hard subprocess PDF defined by HerwigppPDF_
'set /Herwig/EventHandlers/LHEReader:PDFB /Herwig/Partons/cmsHardPDFSet',
),
)
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