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LHC-Powheg.in
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LHC-Powheg.in
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# -*- ThePEG-repository -*-
##################################################
# Example generator based on LHC parameters
# using NLO matrix elements and matching in
# the Powheg formalism
# usage: Herwig read LHC.in
##################################################
##################################################
# Technical parameters for this run
##################################################
cd /Herwig/Generators
set LHCGenerator:NumberOfEvents 10000000
set LHCGenerator:RandomNumberGenerator:Seed 31122001
set LHCGenerator:PrintEvent 10
set LHCGenerator:MaxErrors 10000
##################################################
# 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/Shower/ShowerHandler:PDFB /Herwig/Partons/ShowerLOPDF
set /Herwig/Partons/MPIExtractor:FirstPDF /Herwig/Partons/MPIPDF
set /Herwig/Partons/MPIExtractor:SecondPDF /Herwig/Partons/MPIPDF
set /Herwig/Partons/QCDExtractor:FirstPDF /Herwig/Partons/HardNLOPDF
set /Herwig/Partons/QCDExtractor:SecondPDF /Herwig/Partons/HardNLOPDF
##################################################
# Setup the POWHEG shower
##################################################
cd /Herwig/Shower
set Evolver:HardEmissionMode POWHEG
read Matchbox/Powheg-Default-ShowerAlphaSTune.in
##################################################
# LHC physics parameters (override defaults here)
##################################################
cd /Herwig/Generators
set LHCGenerator:EventHandler:LuminosityFunction:Energy 13000.0
# Intrinsic pT tune extrapolated to LHC energy
set /Herwig/Shower/Evolver:IntrinsicPtGaussian 2.2*GeV
##################################################
# Matrix Elements for hadron-hadron collisions
# (by default only gamma/Z switched on)
##################################################
cd /Herwig/MatrixElements/
# Drell-Yan Z/gamma
insert SimpleQCD:MatrixElements[0] PowhegMEqq2gZ2ff
#
# Drell-Yan W
# insert SimpleQCD:MatrixElements[0] PowhegMEqq2W2ff
# higgs + W (N.B. if considering all W decay modes useful to set )
# (jet pT cut to zero so no cut on W decay products )
# insert SimpleQCD:MatrixElements[0] PowhegMEPP2WH
# set /Herwig/Cuts/JetKtCut:MinKT 0.0*GeV
#
# higgs + Z (N.B. if considering all Z decay modes useful to set )
# (jet pT cut to zero so no cut on Z decay products )
# insert SimpleQCD:MatrixElements[0] PowhegMEPP2ZH
# set /Herwig/Cuts/JetKtCut:MinKT 0.0*GeV
#
# gg/qqbar -> Higgs
# insert SimpleQCD:MatrixElements[0] PowhegMEHiggs
#
# Weak boson pair production: WW / ZZ / WZ / W+Z [WpZ] / W-Z [WmZ]
# needs the gauge bosons decayed before the shower
# create Herwig::HwDecayHandler /Herwig/NewPhysics/DecayHandler
# set /Herwig/NewPhysics/DecayHandler:NewStep No
# insert /Herwig/NewPhysics/DecayHandler:Excluded 0 /Herwig/Particles/tau-
# insert /Herwig/NewPhysics/DecayHandler:Excluded 1 /Herwig/Particles/tau+
# insert /Herwig/EventHandlers/LHCHandler:PreCascadeHandlers 0 /Herwig/NewPhysics/DecayHandler
# insert SimpleQCD:MatrixElements[0] PowhegMEPP2VV
# set PowhegMEPP2VV:Process WpZ
#
# Higgs production via VBF
# insert SimpleQCD:MatrixElements[0] PowhegMEPP2HiggsVBF
cd /Herwig/Generators
##################################################
# Useful analysis handlers for hadron-hadron physics
##################################################
# analysis of W/Z events
# insert LHCGenerator:AnalysisHandlers 0 /Herwig/Analysis/DrellYan
##################################################
# Useful analysis handlers for HepMC related output
##################################################
# Schematic overview of an event (requires --with-hepmc to be set at configure time
# and the graphviz program 'dot' to produce a plot)
# insert LHCGenerator:AnalysisHandlers 0 /Herwig/Analysis/Plot
# A HepMC dump file (requires --with-hepmc to be set at configure time)
# insert LHCGenerator:AnalysisHandlers 0 /Herwig/Analysis/HepMCFile
# set /Herwig/Analysis/HepMCFile:PrintEvent 100
# set /Herwig/Analysis/HepMCFile:Format GenEvent
# set /Herwig/Analysis/HepMCFile:Units GeV_mm
##################################################
# Save run for later usage with 'Herwig run'
##################################################
saverun LHC-Powheg LHCGenerator
##################################################
# uncomment this section for an example batch run
# of two repeats with different parameters
#
# Note that a separate call of 'Herwig run'
# is not required in this case
##################################################
# set LHCGenerator:NumberOfEvents 10
# run LHC-full LHCGenerator
#
# set LHCGenerator:EventHandler:LuminosityFunction:Energy 900.0
# run LHC-initial LHCGenerator
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