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DIS-Powheg.in
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##################################################
# Example generator based on DIS parameters
# usage: Herwig read DIS.in
##################################################
read Matchbox/Powheg-Default-ShowerAlphaSTune.in
set /Herwig/Particles/e-:PDF /Herwig/Partons/NoPDF
set /Herwig/Particles/e+:PDF /Herwig/Partons/NoPDF
# switch off final-state electron/muon FSR
do /Herwig/Shower/SplittingGenerator:DeleteFinalSplitting e-->e-,gamma; /Herwig/Shower/LtoLGammaSudakov
do /Herwig/Shower/SplittingGenerator:DeleteFinalSplitting mu-->mu-,gamma; /Herwig/Shower/LtoLGammaSudakov
do /Herwig/Shower/SplittingGenerator:DeleteFinalSplitting tau-->tau-,gamma; /Herwig/Shower/LtoLGammaSudakov
set /Herwig/Shower/KinematicsReconstructor:ReconstructionOption Colour
##################################################
# Need to use an NLO PDF
##################################################
set /Herwig/Particles/p+:PDF /Herwig/Partons/HardNLOPDF
set /Herwig/Particles/pbar-:PDF /Herwig/Partons/HardNLOPDF
set /Herwig/Shower/ShowerHandler:PDFA /Herwig/Partons/ShowerLOPDF
set /Herwig/Partons/MPIExtractor:FirstPDF /Herwig/Partons/MPIPDF
set /Herwig/Partons/QCDExtractor:FirstPDF /Herwig/Partons/HardNLOPDF
##################################################
# Setup the POWHEG shower
##################################################
cd /Herwig/Shower
set ShowerHandler:IntrinsicPtGaussian 1.9*GeV
set ShowerHandler:HardEmission POWHEG
cd /Herwig/MatrixElements/
# Neutral current DIS
insert SimpleDIS:MatrixElements[0] /Herwig/MatrixElements/PowhegMEDISNC
${process}
cd /Herwig/Generators
set DISGenerator:NumberOfEvents 10000000
set DISGenerator:RandomNumberGenerator:Seed 31122001
set DISGenerator:DebugLevel 0
set DISGenerator:PrintEvent 10
set DISGenerator:MaxErrors 1000000
set /Herwig/Shower/ShowerHandler:MPIHandler NULL
cd /Herwig/Generators
create ThePEG::RivetAnalysis /Herwig/Analysis/RivetAnalysis RivetAnalysis.so
insert DISGenerator:AnalysisHandlers 0 /Herwig/Analysis/RivetAnalysis
mv /Herwig/Generators/DISGenerator /Herwig/Generators/EventGenerator
read ${parameterFile}
##################################################
# Save run for later usage with 'Herwig run'
##################################################
cd /Herwig/Generators
saverun ${runname} EventGenerator

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DIS-Powheg.in (2 KB)

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