mc.PhPy8EG_A14NNPDF23_VBF_ZZ_example.py

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# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 
#--------------------------------------------------------------
# This is an example joboption to generate events with Powheg
# using ATLAS' interface. Users should optimise and carefully
# validate the settings before making an official sample request.
#--------------------------------------------------------------
 
#--------------------------------------------------------------
# EVGEN configuration
#--------------------------------------------------------------
evgenConfig.description = "POWHEG+Pythia8 VBF ZZ production with A14 NNPDF2.3 tune."
evgenConfig.keywords = ["SM", "diboson", "ZZ", "VBF"]
evgenConfig.contact = ["tpelzer@cern.ch"]
 
# --------------------------------------------------------------
# Load ATLAS defaults for the Powheg VBF_Z_Z process
# --------------------------------------------------------------
include("PowhegControl/PowhegControl_VBF_ZZ_Common.py")
 
# --------------------------------------------------------------
# Reweighting to get PDF and QCD scale weight variations
# is not yet supported for this process (it fails for
# currently unknown reasons), so it is disabled here by
# setting single values for the PDF and QCD scale factors
# --------------------------------------------------------------
PowhegConfig.PDF = 260000
PowhegConfig.mu_F = 1.0
PowhegConfig.mu_R = 1.0
 
# {"name":[nominal_value, changed_value, stage at which the value is changed]}
parameterStageDict = { "fakevirt" : [0 , 1, 1]}
PowhegConfig.set_parameter_stage( parameterStageDict )
 
 
# --------------------------------------------------------------
# possible decay modes for each z: e+ e-, mu+ mu-, ve ve~, vm vm~, d d~, s s~, u u~, c- c~, (d d~ / s s~), (u u~ / c c~)
# --------------------------------------------------------------
PowhegConfig.decay_mode = "z z > e+ e- mu+ mu-"
 
# --------------------------------------------------------------
# Generate events
# --------------------------------------------------------------
PowhegConfig.generate()
 
#--------------------------------------------------------------
# Pythia8 showering with the A14 NNPDF2.3 tune, main31 routine
#--------------------------------------------------------------
include("Pythia8_i/Pythia8_A14_NNPDF23LO_EvtGen_Common.py")
include("Pythia8_i/Pythia8_Powheg_Main31.py")