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LEP-Merging.in
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# -*- ThePEG-repository -*-
##################################################
## Herwig/Merging example input file
##################################################
##################################################
## Collider type
##################################################
read Matchbox/EECollider.in
read Merging/Merging.in
##################################################
## Beam energy sqrt(s)
##################################################
cd /Herwig/EventHandlers
set EventHandler:LuminosityFunction:Energy 91.2*GeV
##################################################
## Process selection
##################################################
## Note that event generation may fail if no matching matrix element has
## been found. Coupling orders are with respect to the Born process,
## i.e. NLO QCD does not require an additional power of alphas.
## Model assumptions
read Matchbox/StandardModelLike.in
read Matchbox/DiagonalCKM.in
## Set the order of the couplings
cd /Herwig/Merging
set MergingFactory:OrderInAlphaS 0
set MergingFactory:OrderInAlphaEW 2
## Select the process
## You may use identifiers such as p, pbar, j, l, mu+, h0 etc.
## Please mind the spaces between *j , j* in the brackets.
## The j (jets) in the brackets are the additional LO jets
do MergingFactory:Process e- e+ -> j j [ j j ]
# Here you can specify how many NLO contributions should be merged.
set MergingFactory:NLOProcesses 2
set Merger:MergingScale 4.*GeV
set Merger:MergingScaleSmearing 0.1
set Merger:gamma 1.
cd /Herwig/MatrixElements/Matchbox/Utility
insert DiagramGenerator:ExcludeInternal 0 /Herwig/Particles/gamma
## Special settings required for on-shell production of unstable particles
## enable for on-shell top production
# read Matchbox/OnShellTopProduction.in
## enable for on-shell W, Z or h production
# read Matchbox/OnShellWProduction.in
# read Matchbox/OnShellZProduction.in
# read Matchbox/OnShellHProduction.in
##################################################
## Matrix element library selection
##################################################
## Select a generic tree/loop combination or a
## specialized NLO package
# read Matchbox/MadGraph-GoSam.in
# read Matchbox/MadGraph-MadGraph.in
# read Matchbox/MadGraph-NJet.in
# read Matchbox/MadGraph-OpenLoops.in
## Uncomment this to use ggh effective couplings
## currently only supported by MadGraph-GoSam
# read Matchbox/HiggsEffective.in
##################################################
## Cut selection
## See the documentation for more options
##################################################
## cuts on additional jets
# read Matchbox/DefaultEEJets.in
# set NJetsCut:NJetsMin 3
##################################################
## Scale choice
## See the documentation for more options
##################################################
cd /Herwig/MatrixElements/Matchbox/Scales/
set /Herwig/Merging/MergingFactory:ScaleChoice SHatScale
##################################################
## Scale uncertainties
##################################################
# read Matchbox/MuDown.in
# read Matchbox/MuUp.in
##################################################
## Shower scale uncertainties
##################################################
# read Matchbox/MuQDown.in
# read Matchbox/MuQUp.in
##################################################
## CMW - Scheme
##################################################
### Use factor in alpha_s argument: alpha_s(q) -> alpha_s(fac*q)
### with fac=exp(-(67-3pi^2-10/3*Nf)/(33-2Nf))
read Merging/FactorCMWScheme.in
### Linear CMW multiplication:
### alpha_s(q) -> alpha_s(q)(1+K_g*alpha_s(q)/2pi )
# read Merging/LinearCMWScheme.in
### Same for 4 flavours
# read Merging/FactorCMWScheme_4fl.in
# read Merging/LinearCMWScheme_4fl.ins
##################################################
## Analyses
##################################################
cd /Herwig/Analysis
insert /Herwig/Generators/EventGenerator:AnalysisHandlers 0 Rivet
# insert /Herwig/Generators/EventGenerator:AnalysisHandlers 0 HepMC
read Merging/LEP91-Analysis.in
##################################################
## Do not apply profile scales for LEP as hard
## scale coincides with kinematic limit
##################################################
set /Herwig/Shower/ShowerHandler:HardScaleProfile NULL
set /Herwig/DipoleShower/DipoleShowerHandler:HardScaleProfile NULL
##################################################
## Save the generator
##################################################
do /Herwig/Merging/MergingFactory:ProductionMode
cd /Herwig/Generators
saverun LEP-Merging EventGenerator
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