HerwigppLHEFile_cfi.py

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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 
    
    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',                       
    ),
)