From 2c5ad5d1969a83ac6895daac9311ae4f789034ee Mon Sep 17 00:00:00 2001
From: James William Monk <james.william.monk@cern.ch>
Date: Mon, 14 Sep 2015 12:21:06 +0200
Subject: [PATCH] improved weight names, JetMatching Hook, GravFlat Hook
(Pythia8_i-00-12-02)
* Updated weight storage so that names instead of ids are used in the HepMC record
* tagging Pythia8_i-00-12-02
2015-09-08 James Monk <jmonk@cern.ch>
* Added JetMatchingMadGraphHook.cxx for FxFx matching
2015-08-02 James Monk <jmonk@cern.ch>
* Updated version of GravFlat UserHook from Jan Stark for 13 TeV running
2015-06-16 James Monk <jmonk@cern.ch>
* reinstate use of map syntax so that weight names are stored in HepMC
2015-06-08 James Monk <jmonk@cern.ch>
* Merging branch for Pythia 8.205 with multiple LHE3 weights onto trunk
2015-05-18 James Monk <jmonk@cern.ch>
* Check order of LHE3 weights on each event is the same
* write MetaData in finalize giving the weight descriptions
2015-03-18 James Monk <jmonk@cern.ch>
...
(Long ChangeLog diff - truncated)
---
Generators/Pythia8_i/Pythia8_i/Pythia8_i.h | 13 +-
Generators/Pythia8_i/cmt/requirements | 2 +-
Generators/Pythia8_i/src/Pythia8_i.cxx | 143 ++++++++---
.../Pythia8_i/src/UserHooks/GravFlat.cxx | 226 ++++++++++++------
.../src/UserHooks/JetMatchingMadGraphHook.cxx | 10 +
5 files changed, 281 insertions(+), 113 deletions(-)
create mode 100644 Generators/Pythia8_i/src/UserHooks/JetMatchingMadGraphHook.cxx
diff --git a/Generators/Pythia8_i/Pythia8_i/Pythia8_i.h b/Generators/Pythia8_i/Pythia8_i/Pythia8_i.h
index 4d2c597f2e9..bbc7bade10c 100644
--- a/Generators/Pythia8_i/Pythia8_i/Pythia8_i.h
+++ b/Generators/Pythia8_i/Pythia8_i/Pythia8_i.h
@@ -8,7 +8,8 @@
#include "GeneratorModules/GenModule.h"
#include "Pythia8/Pythia.h"
-#include "Pythia8/Pythia8ToHepMC.h"
+//#include "Pythia8/../Pythia8Plugins/HepMC2.h"
+#include "Pythia8Plugins/HepMC2.h"
// calls to fortran routines
#include "CLHEP/Random/RandFlat.h"
@@ -67,7 +68,7 @@ public:
CommandException(const string &cmd): std::runtime_error("Cannot interpret command: " + cmd){
}
};
-
+
virtual StatusCode genInitialize();
virtual StatusCode callGenerator();
virtual StatusCode fillEvt(GenEvent *evt);
@@ -87,9 +88,6 @@ private:
static std::string xmlpath();
-// StoreGateSvc* m_sGateService;
-// string m_mcEventKey;
-
static std::string findValue(const std::string &command, const std::string &key);
int m_internal_event_number;
@@ -141,8 +139,11 @@ private:
std::string m_particleDataFile;
std::string m_outputParticleDataFile;
- static int s_allowedTunes(double version);
+ vector<string> m_weightIDs;
+ bool m_doLHE3Weights;
+ static int s_allowedTunes(double version);
+
};
#endif
diff --git a/Generators/Pythia8_i/cmt/requirements b/Generators/Pythia8_i/cmt/requirements
index 055de758b42..0e0b237d439 100644
--- a/Generators/Pythia8_i/cmt/requirements
+++ b/Generators/Pythia8_i/cmt/requirements
@@ -31,7 +31,7 @@ end_private
macro_append pythia8_ifiles 'Pythia8_i.cxx UserProcessFactory.cxx UserHooksFactory.cxx UserResonanceFactory.cxx'
macro_append UserProcessFiles 'UserProcesses/Sigma2qqbar2emu.cxx UserProcesses/Sigma2qqbar2lStarlBar.cxx UserProcesses/Sigma2qqbar2lStarlStarBar.cxx'
-macro_append UserHookFiles 'UserHooks/WZVetoedShower.cxx UserHooks/QCDVetoedShower.cxx UserHooks/PoWHEGVetoedShower.cxx UserHooks/GravFlat.cxx UserHooks/SuppressMPI.cxx UserHooks/EnhanceMPI.cxx UserHooks/ISRVetoedShower.cxx UserHooks/PTRelVetoedShower.cxx UserHooks/WprimeFlat.cxx UserHooks/WprimeWZFlat.cxx UserHooks/main31.cxx'
+macro_append UserHookFiles 'UserHooks/WZVetoedShower.cxx UserHooks/QCDVetoedShower.cxx UserHooks/PoWHEGVetoedShower.cxx UserHooks/GravFlat.cxx UserHooks/JetMatchingMadGraphHook.cxx UserHooks/SuppressMPI.cxx UserHooks/EnhanceMPI.cxx UserHooks/ISRVetoedShower.cxx UserHooks/PTRelVetoedShower.cxx UserHooks/WprimeFlat.cxx UserHooks/WprimeWZFlat.cxx UserHooks/main31.cxx'
macro_append UserResonanceFiles 'UserResonances/ResonanceExcitedCI.cxx UserResonances/ResonanceLQ.cxx'
apply_pattern named_dual_use_library library="Pythia8_i" files="$(pythia8_ifiles) $(UserProcessFiles) $(UserHookFiles) $(UserResonanceFiles)"
diff --git a/Generators/Pythia8_i/src/Pythia8_i.cxx b/Generators/Pythia8_i/src/Pythia8_i.cxx
index 06fa8146a8e..bee5ba18ef3 100644
--- a/Generators/Pythia8_i/src/Pythia8_i.cxx
+++ b/Generators/Pythia8_i/src/Pythia8_i.cxx
@@ -37,7 +37,8 @@ m_nAccepted(0.),
m_nMerged(0.),
m_failureCount(0),
m_procPtr(0),
-m_userHookPtr(0)
+m_userHookPtr(0),
+m_doLHE3Weights(false)
{
declareProperty("Commands", m_commands);
declareProperty("UserParams", m_userParams);
@@ -92,43 +93,62 @@ StatusCode Pythia8_i::genInitialize() {
Pythia8_i::pythia_stream = "PYTHIA8_INIT";
// We do explicitly set tune 4C, since it is the starting point for many other tunes
- // Tune 4C for pp collisions (default from 8.150 anyway)
+ // Tune 4C for pp collisions
m_pythia.readString("Tune:pp = 5");
- // but also use LHAPDF and CTEQ6L1 unless otherwise instructed in JO
- if(m_useLHAPDF){
- m_pythia.readString("PDF:useLHAPDF = on");
- m_pythia.readString("PDF:LHAPDFset = cteq6ll.LHpdf");
- }else{
- m_pythia.readString("PDF:useLHAPDF = off");
+ // also use CTEQ6L1 from LHAPDF 6 by default
+ // can be over-written using JO
+ m_pythia.readString("PDF:pSet= LHAPDF6:cteq6ll.LHpdf");
+
+ // have to find any old-style Pythia 8.18x PDF commands and convert them
+ foreach(string &cmd, m_commands){
+ try{
+ string val = findValue(cmd, "PDF:LHAPDFset");
+ if(val != ""){
+ cmd = "PDF:pSet = LHAPDF6:" + val;
+ }else{
+ val = findValue(cmd, "BeamRemnants:reconnectRange");
+ if(val != ""){
+ cmd = "ColourReconnection:range = " + val;
+ m_commands += "ColourReconnection:mode = 0";
+ }
+ }
+
+ }catch(Pythia8_i::CommandException err){
+ ATH_MSG_ERROR(err.what());
+ return StatusCode::FAILURE;
+ }
+
+ if(cmd.find("PDF:useLHAPDF") != std::string::npos){
+ ATH_MSG_WARNING("PDF:useLHAPDF is deprecated and ignored.");
+ cmd="";
+ }
}
-
- for(vector<string>::const_iterator param = m_userParams.begin();
- param != m_userParams.end(); ++param){
+
+ foreach(const string ¶m, m_userParams){
vector<string> splits;
- boost::split(splits, *param, boost::is_any_of("="));
+ boost::split(splits, param, boost::is_any_of("="));
if(splits.size() != 2){
- ATH_MSG_ERROR("Cannot interpret user param command: " + *param);
+ ATH_MSG_ERROR("Cannot interpret user param command: " + param);
return StatusCode::FAILURE;
}
boost::erase_all(splits[0], " ");
m_pythia.settings.addParm(splits[0], 0., false, false, 0., 0.);
- m_commands+=*param;
+ m_commands+=param;
}
- for(vector<string>::const_iterator mode = m_userModes.begin();
- mode != m_userModes.end(); ++mode){
+ foreach(const string &mode, m_userModes){
vector<string> splits;
- boost::split(splits, *mode, boost::is_any_of("="));
+ boost::split(splits, mode, boost::is_any_of("="));
if(splits.size() != 2){
- ATH_MSG_ERROR("Cannot interpret user mode command: " + *mode);
+ ATH_MSG_ERROR("Cannot interpret user mode command: " + mode);
return StatusCode::FAILURE;
}
boost::erase_all(splits[0], " ");
m_pythia.settings.addMode(splits[0], 0, false, false, 0, 0);
- m_commands+=*mode;
+ m_commands+=mode;
}
// Now apply the settings from the JO
@@ -257,30 +277,41 @@ StatusCode Pythia8_i::genInitialize() {
canInit = false;
}
}
-
+
if(m_lheFile != ""){
- if(!m_pythia.init(m_lheFile)){
- ATH_MSG_ERROR("Unable to read requested LHE file: " + m_lheFile + " !!");
- ATH_MSG_ERROR("Pythia 8 initialisation will FAIL!");
+ if(m_procPtr != 0){
+ ATH_MSG_ERROR("Both LHE file and user process have been specified");
+ ATH_MSG_ERROR("LHE input does not make sense with a user process!");
canInit = false;
}
- }else{
- if(m_procPtr != 0){
- if(!m_pythia.setSigmaPtr(m_procPtr)){
- ATH_MSG_ERROR("Unable to set requested user process: " + m_userProcess + " !!");
- ATH_MSG_ERROR("Pythia 8 initialisation will FAIL!");
- canInit = false;
- }
+
+ canInit = canInit && m_pythia.readString("Beams:frameType = 4");
+ canInit = canInit && m_pythia.readString("Beams:LHEF = " + m_lheFile);
+ if(!canInit){
+ ATH_MSG_ERROR("Unable to read requested LHE file: " + m_lheFile + " !");
+ ATH_MSG_ERROR("Pythia 8 initialisation will FAIL!");
}
- if(!m_pythia.init(beam1, beam2, m_collisionEnergy)){
- ATH_MSG_ERROR("Unable to initialise Pythia beams !!");
+ }else{
+ canInit = canInit && m_pythia.readString("Beams:frameType = 1");
+ canInit = canInit && m_pythia.readString("Beams:idA = " + boost::lexical_cast<string>(beam1));
+ canInit = canInit && m_pythia.readString("Beams:idB = " + boost::lexical_cast<string>(beam2));
+ canInit = canInit && m_pythia.readString("Beams:eCM = " + boost::lexical_cast<string>(m_collisionEnergy));
+ }
+
+ if(m_procPtr != 0){
+ if(!m_pythia.setSigmaPtr(m_procPtr)){
+ ATH_MSG_ERROR("Unable to set requested user process: " + m_userProcess + " !!");
ATH_MSG_ERROR("Pythia 8 initialisation will FAIL!");
canInit = false;
}
}
-
+
StatusCode returnCode = SUCCESS;
+ if(canInit){
+ canInit = m_pythia.init();
+ }
+
if(!canInit){
returnCode = StatusCode::FAILURE;
ATH_MSG_ERROR(" *** Unable to initialise Pythia !! ***");
@@ -390,7 +421,35 @@ StatusCode Pythia8_i::fillEvt(GenEvent *evt){
// set the event weight
evt->weights().clear();
- evt->weights().push_back(eventWeight);
+
+ vector<string>::const_iterator id = m_weightIDs.begin();
+
+ if(m_pythia.info.getWeightsDetailedSize() != 0){
+ for(map<string, Pythia8::LHAwgt>::const_iterator wgt = m_pythia.info.rwgt->wgts.begin();
+ wgt != m_pythia.info.rwgt->wgts.end(); ++wgt){
+
+ if(m_internal_event_number == 1){
+ m_doLHE3Weights = true;
+ m_weightIDs.push_back(wgt->first);
+ }else{
+ if(*id != wgt->first){/// mismatch in weight name!
+ ATH_MSG_ERROR("Mismatch in LHE3 weight name. Found "<<wgt->first<<", expected "<<*id);
+ return StatusCode::FAILURE;
+ }
+ ++id;
+ }
+
+ map<string, Pythia8::LHAweight>::const_iterator weightName = m_pythia.info.init_weights->find(wgt->first);
+ if(weightName != m_pythia.info.init_weights->end()){
+ evt->weights()[weightName->second.contents] = mergingWeight * wgt->second.contents;
+ }else{
+ evt->weights()[wgt->first] = mergingWeight * wgt->second.contents;
+ }
+
+ }
+ }else{
+ evt->weights().push_back(eventWeight);
+ }
// Units correction
#ifdef HEPMC_HAS_UNITS
@@ -434,6 +493,22 @@ StatusCode Pythia8_i::genFinalize(){
std::cout << "MetaData: cross-section (nb)= " << xs <<std::endl;
std::cout << "MetaData: generator= Pythia 8." << PY8VERSION <<std::endl;
+ if(m_doLHE3Weights){
+
+ std::cout<<"MetaData: weights = ";
+ foreach(const string &id, m_weightIDs){
+
+ map<string, Pythia8::LHAweight>::const_iterator weight = m_pythia.info.init_weights->find(id);
+
+ if(weight != m_pythia.info.init_weights->end()){
+ std::cout<<weight->second.contents<<" | ";
+ }else{
+ std::cout<<"Unknown | ";
+ }
+ }
+ std::cout<<std::endl;
+ }
+
return SUCCESS;
}
diff --git a/Generators/Pythia8_i/src/UserHooks/GravFlat.cxx b/Generators/Pythia8_i/src/UserHooks/GravFlat.cxx
index f83217d1a39..c7acad93b99 100644
--- a/Generators/Pythia8_i/src/UserHooks/GravFlat.cxx
+++ b/Generators/Pythia8_i/src/UserHooks/GravFlat.cxx
@@ -2,9 +2,12 @@
Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
+#include "UserSetting.h"
#include "Pythia8_i/UserHooksFactory.h"
#include "Pythia8/PhaseSpace.h"
+#include <stdexcept>
+
namespace Pythia8{
class GravFlat;
}
@@ -12,30 +15,30 @@ namespace Pythia8{
Pythia8_UserHooks::UserHooksFactory::Creator<Pythia8::GravFlat> gravFlatCreator("GravFlat");
namespace Pythia8 {
-
+
class GravFlat : public UserHooks {
public:
// Constructor.
- GravFlat(){}
+ GravFlat(): m_energyMode("GravFlat:EnergyMode", 8){}
// Destructor.
~GravFlat(){}
// Allow process cross section to be modified...
virtual bool canModifySigma() {return true;}
-
+
// ...which gives access to the event at the trial level, before selection.
- virtual double multiplySigmaBy(const SigmaProcess* sigmaProcessPtr,
- const PhaseSpace* phaseSpacePtr,
- bool /* inEvent */) {
+ virtual double multiplySigmaBy(const SigmaProcess* sigmaProcessPtr,
+ const PhaseSpace* phaseSpacePtr,
+ bool /* inEvent */) {
// All events should be 2 -> 1, but kill them if not.
- if (sigmaProcessPtr->nFinal() != 1) return 0.;
+ if (sigmaProcessPtr->nFinal() != 1) return 0.;
// Weight cross section with BW propagator, i.e. to remove it.
// (inEvent = false for initialization).
- // No inEvent criteria, want weight both for cross section
+ // No inEvent criteria, want weight both for cross section
// and MC generation.
int idRes = sigmaProcessPtr->resonanceA();
double mRes = particleDataPtr->m0(idRes);
@@ -43,75 +46,154 @@ namespace Pythia8 {
double m2Res = mRes*mRes;
double GamMRat = wRes/mRes;
double sHat = phaseSpacePtr->sHat();
-
+
double weightBW = pow2(sHat - m2Res) + pow2(sHat * GamMRat);
-
+
double weightPL = 1;
double rH = sqrt(sHat);
-
- if (rH >= 50 && rH < 2000){
-
- // Completely Flat M=2 TeV, Above 0.05 TeV, Below 2 TeV
- // 1e5
- double p0 = 12.4176;
- double p1 = -0.364611;
- double p2 = 0.00293827;
- double p3 = 4.3106e-07;
- double p4 = -2.61662e-09;
- double p5 = 1.33037e-12;
- double p6 = -2.07848e-16;
-
- weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
-
- }
- else if (rH >= 2000 && rH < 4000){
-
- // Completely Flat M=2 TeV, Above 2 TeV, Below 4 TeV
- // 1e5
- double p0 = 41237.9;
- double p1 = -95.9745;
- double p2 = 0.0979667;
- double p3 = -5.14644e-05;
- double p4 = 1.45857e-08;
- double p5 = -2.13169e-12;
- double p6 = 1.26473e-16;
-
- weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
-
- }
- else if (rH >= 4000 && rH < 5500){
-
- // Completely Flat M=2 TeV, Above 4 TeV, Below 5.5 TeV
- // 1e5
- double p0 = 1.11676e+06;
- double p1 = -925.647;
- double p2 = 0.311595;
- double p3 = -5.38465e-05;
- double p4 = 4.92286e-09;
- double p5 = -2.1452e-13;
- double p6 = 2.97112e-18;
-
- weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
-
+
+ double weight=1;
+ switch(m_energyMode(settingsPtr)){
+ case 8:
+
+ if (rH >= 50 && rH < 2000){
+
+ // Completely Flat M=2 TeV, Above 0.05 TeV, Below 2 TeV
+ // 1e5
+ double p0 = 12.4176;
+ double p1 = -0.364611;
+ double p2 = 0.00293827;
+ double p3 = 4.3106e-07;
+ double p4 = -2.61662e-09;
+ double p5 = 1.33037e-12;
+ double p6 = -2.07848e-16;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+ else if (rH >= 2000 && rH < 4000){
+
+ // Completely Flat M=2 TeV, Above 2 TeV, Below 4 TeV
+ // 1e5
+ double p0 = 41237.9;
+ double p1 = -95.9745;
+ double p2 = 0.0979667;
+ double p3 = -5.14644e-05;
+ double p4 = 1.45857e-08;
+ double p5 = -2.13169e-12;
+ double p6 = 1.26473e-16;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+ else if (rH >= 4000 && rH < 5500){
+
+ // Completely Flat M=2 TeV, Above 4 TeV, Below 5.5 TeV
+ // 1e5
+ double p0 = 1.11676e+06;
+ double p1 = -925.647;
+ double p2 = 0.311595;
+ double p3 = -5.38465e-05;
+ double p4 = 4.92286e-09;
+ double p5 = -2.1452e-13;
+ double p6 = 2.97112e-18;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+ else if (rH >= 5500 && rH <= 6500){
+
+ // Completely Flat M=2 TeV, Above 5.5 TeV, Below 6.5 TeV
+ // 1e5
+ double p0 = 9.70964e+13;
+ double p1 = -4.17142e-03;
+ double p2 = -3.06415e-03;
+
+ weightPL = 1/((p0*exp(p1*rH))+(p2*rH));
+
+ }
+
+ weight = weightBW * weightPL;
+ return weight;
+
+ case 13:
+
+ if (rH >= 50 && rH < 2500){
+
+ // Completely flat M=5 TeV, k/M=0.1; above 0.05 TeV, below 2.5 TeV
+ // 8e5
+ double p0 = 1.06963e+01;
+ double p1 = -1.86534e-01;
+ double p2 = 9.00278e-04;
+ double p3 = 1.01576e-06;
+ double p4 = -1.29332e-09;
+ double p5 = 4.64752e-13;
+ double p6 = -5.68297e-17;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+ else if (rH >= 2500 && rH < 6000){
+
+ // Completely flat M=5 TeV, k/M=0.1; above 2.5 TeV, below 6.0 TeV
+ // 8e5
+ double p0 = -1.77843e+03;
+ double p1 = 3.70114e+00;
+ double p2 = -1.06644e-03;
+ double p3 = 3.77245e-08;
+ double p4 = 2.49922e-11;
+ double p5 = -3.96985e-15;
+ double p6 = 1.88504e-19;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+ else if (rH >= 6000 && rH < 8000){
+
+ // Completely flat M=5 TeV, k/M=0.1; above 6.0 TeV, below 8.0 TeV
+ // 8e5
+ double p0 = 1.43663e+03;
+ double p1 = 3.40467e-01;
+ double p2 = -7.44453e-05;
+ double p3 = -1.08578e-08;
+ double p4 = 6.74486e-13;
+ double p5 = 2.82952e-16;
+ double p6 = -2.20149e-20;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+ else if (rH >= 8000 && rH <= 10500){
+
+ // Completely flat M=5 TeV, k/M=0.1; above 8.0 TeV, below 10.5 TeV
+ // 8e5
+ double p0 = 1.21245e+03;
+ double p1 = -1.08389e-01;
+ double p2 = -1.02834e-05;
+ double p3 = 4.11376e-12;
+ double p4 = 8.55312e-14;
+ double p5 = 6.98307e-18;
+ double p6 = -6.52683e-22;
+
+ weightPL = 1/(p0+(p1*rH)+(p2*pow(rH,2))+(p3*pow(rH,3))+(p4*pow(rH,4))+(p5*pow(rH,5))+(p6*pow(rH,6)));
+
+ }
+
+ weight = weightBW * weightPL;
+ return weight;
+
+ default:
+
+ throw std::runtime_error("Unknown GravFlat:EnergyMode - should be either 8 or 13!");
+
}
- else if (rH >= 5500 && rH <= 6500){
-
- // Completely Flat M=2 TeV, Above 5.5 TeV, Below 6.5 TeV
- // 1e5
- double p0 = 9.70964e+13;
- double p1 = -4.17142e-03;
- double p2 = -3.06415e-03;
-
- weightPL = 1/((p0*exp(p1*rH))+(p2*rH));
-
- }
-
- double weight = weightBW * weightPL;
-
- return weight;
-
}
+ private:
+
+ /// User-settable mode to set the collision energy (default is 8)
+ Pythia8_UserHooks::UserSetting<int> m_energyMode;
+
};
-
+
} // end namespace Pythia8
diff --git a/Generators/Pythia8_i/src/UserHooks/JetMatchingMadGraphHook.cxx b/Generators/Pythia8_i/src/UserHooks/JetMatchingMadGraphHook.cxx
new file mode 100644
index 00000000000..3bf5d1cb101
--- /dev/null
+++ b/Generators/Pythia8_i/src/UserHooks/JetMatchingMadGraphHook.cxx
@@ -0,0 +1,10 @@
+/*
+ Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+*/
+
+#include "Pythia8_i/UserHooksFactory.h"
+#include "Pythia8Plugins/JetMatching.h"
+
+namespace Pythia8{
+ Pythia8_UserHooks::UserHooksFactory::Creator<Pythia8::JetMatchingMadgraph> JetMatchingMadGraphCreator("JetMatchingMadgraph");
+}
--
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