Inheritance diagram for GenParticles2HepMCConverter:

Public Member Functions
	GenParticles2HepMCConverter (const edm::ParameterSet &pset)

void	produce (edm::Event &event, const edm::EventSetup &eventSetup) override

	~GenParticles2HepMCConverter () override

Public Member Functions inherited from edm::stream::EDProducer<>
	EDProducer ()=default

bool	hasAbilityToProduceInLumis () const final

bool	hasAbilityToProduceInRuns () const final

Private Member Functions
HepMC::FourVector	FourVector (const reco::Candidate::Point &point)

HepMC::FourVector	FourVector (const reco::Candidate::LorentzVector &lvec)

Private Attributes
const double	cmEnergy_

edm::EDGetTokenT< GenEventInfoProduct >	genEventInfoToken_

edm::EDGetTokenT< reco::CandidateView >	genParticlesToken_

edm::ESHandle< ParticleDataTable >	pTable_

std::vector< int >	signalParticlePdgIds_

Additional Inherited Members
Public Types inherited from edm::stream::EDProducer<>
typedef CacheContexts< T... >	CacheTypes

typedef CacheTypes::GlobalCache	GlobalCache

typedef AbilityChecker< T... >	HasAbility

typedef CacheTypes::LuminosityBlockCache	LuminosityBlockCache

typedef LuminosityBlockContextT< LuminosityBlockCache, RunCache, GlobalCache >	LuminosityBlockContext

typedef CacheTypes::LuminosityBlockSummaryCache	LuminosityBlockSummaryCache

typedef CacheTypes::RunCache	RunCache

typedef RunContextT< RunCache, GlobalCache >	RunContext

typedef CacheTypes::RunSummaryCache	RunSummaryCache

Detailed Description

Definition at line 27 of file GenParticles2HepMCConverter.cc.

Constructor & Destructor Documentation

GenParticles2HepMCConverter::GenParticles2HepMCConverter ( const edm::ParameterSet & pset )

explicit

Definition at line 58 of file GenParticles2HepMCConverter.cc.

References genEventInfoToken_, genParticlesToken_, edm::ParameterSet::getParameter(), and signalParticlePdgIds_.

                                                                                    :
   cmEnergy_(pset.getUntrackedParameter<double>("cmEnergy", 13000)) // dummy value to set incident proton pz for particle gun samples
 {
   genParticlesToken_ = consumes<reco::CandidateView>(pset.getParameter<edm::InputTag>("genParticles"));
   genEventInfoToken_ = consumes<GenEventInfoProduct>(pset.getParameter<edm::InputTag>("genEventInfo"));
   signalParticlePdgIds_ = pset.getParameter<std::vector<int>>("signalParticlePdgIds");
 
   produces<edm::HepMCProduct>("unsmeared");
 }

GenParticles2HepMCConverter::~GenParticles2HepMCConverter ( )

inlineoverride

Definition at line 31 of file GenParticles2HepMCConverter.cc.

31 {};

Member Function Documentation

HepMC::FourVector GenParticles2HepMCConverter::FourVector ( const reco::Candidate::Point & point )

inlineprivate

Definition at line 44 of file GenParticles2HepMCConverter.cc.

Referenced by produce().

   {
     return HepMC::FourVector(10*point.x(), 10*point.y(), 10*point.z(), 0);
   };

HepMC::FourVector GenParticles2HepMCConverter::FourVector ( const reco::Candidate::LorentzVector & lvec )

inlineprivate

Definition at line 49 of file GenParticles2HepMCConverter.cc.

References SiStripPI::max.

   {
     // Avoid negative mass, set minimum m^2 = 0
     return HepMC::FourVector(lvec.px(), lvec.py(), lvec.pz(), std::hypot(lvec.P(), std::max(0., lvec.mass())));
   };

void GenParticles2HepMCConverter::produce	(	edm::Event &	event,
		const edm::EventSetup &	eventSetup
	)

override

Definition at line 68 of file GenParticles2HepMCConverter.cc.

References funct::abs(), GenEventInfoProduct::alphaQCD(), GenEventInfoProduct::alphaQED(), edm::View< T >::at(), class-composition::children, cmEnergy_, reco::Candidate::daughter(), DEFINE_FWK_MODULE, reco::Candidate::eta(), edm::EventID::event(), spr::find(), FourVector(), genEventInfoToken_, GenParticle::GenParticle, genParticlesToken_, edm::EventSetup::getData(), mps_fire::i, gen::PdfInfo::id, edm::EventBase::id(), ResonanceBuilder::mass, reco::Candidate::mass(), reco::Candidate::mother(), eostools::move(), gen::n, reco::Candidate::numberOfMothers(), or, AlCaHLTBitMon_ParallelJobs::p, reco::Candidate::p4(), GenEventInfoProduct::pdf(), common_cff::pdgId, reco::Candidate::pdgId(), pTable_, reco::Candidate::pz(), GenEventInfoProduct::qScale(), gen::PdfInfo::scalePDF, signalParticlePdgIds_, GenEventInfoProduct::signalProcessID(), edm::View< T >::size(), reco::Candidate::status(), findQualityFiles::v, reco::Candidate::vertex(), GenEventInfoProduct::weights(), gen::PdfInfo::x, and gen::PdfInfo::xPDF.

 {
   edm::Handle<reco::CandidateView> genParticlesHandle;
   event.getByToken(genParticlesToken_, genParticlesHandle);
 
   edm::Handle<GenEventInfoProduct> genEventInfoHandle;
   event.getByToken(genEventInfoToken_, genEventInfoHandle);
 
   eventSetup.getData(pTable_);
 
   HepMC::GenEvent* hepmc_event = new HepMC::GenEvent();
   hepmc_event->set_event_number(event.id().event());
   hepmc_event->set_signal_process_id(genEventInfoHandle->signalProcessID());
   hepmc_event->set_event_scale(genEventInfoHandle->qScale());
   hepmc_event->set_alphaQED(genEventInfoHandle->alphaQED());
   hepmc_event->set_alphaQCD(genEventInfoHandle->alphaQCD());
 
   hepmc_event->weights() = genEventInfoHandle->weights();
 
   // Set PDF
   const gen::PdfInfo* pdf = genEventInfoHandle->pdf();
   if ( pdf != nullptr ) {
     const int pdf_id1 = pdf->id.first, pdf_id2 = pdf->id.second;
     const double pdf_x1 = pdf->x.first, pdf_x2 = pdf->x.second;
     const double pdf_scalePDF = pdf->scalePDF;
     const double pdf_xPDF1 = pdf->xPDF.first, pdf_xPDF2 = pdf->xPDF.second;
     HepMC::PdfInfo hepmc_pdfInfo(pdf_id1, pdf_id2, pdf_x1, pdf_x2, pdf_scalePDF, pdf_xPDF1, pdf_xPDF2);
     hepmc_event->set_pdf_info(hepmc_pdfInfo);
   }
 
   // Prepare list of HepMC::GenParticles
   std::map<const reco::Candidate*, HepMC::GenParticle*> genCandToHepMCMap;
   HepMC::GenParticle* hepmc_parton1 = nullptr, * hepmc_parton2 = nullptr;
   std::vector<HepMC::GenParticle*> hepmc_particles;
   const reco::Candidate* parton1 = nullptr, * parton2 = nullptr;
   for ( unsigned int i=0, n=genParticlesHandle->size(); i<n; ++i )
   {
     const reco::Candidate* p = &genParticlesHandle->at(i);
     HepMC::GenParticle* hepmc_particle = new HepMC::GenParticle(FourVector(p->p4()), p->pdgId(), p->status());
     hepmc_particle->suggest_barcode(i+1);
 
     // Assign particle's generated mass from the standard particle data table
     double particleMass;
     if ( pTable_->particle(p->pdgId()) ) particleMass = pTable_->particle(p->pdgId())->mass();
     else particleMass = p->mass();
 
     hepmc_particle->set_generated_mass(particleMass);
 
     hepmc_particles.push_back(hepmc_particle);
     genCandToHepMCMap[p] = hepmc_particle;
 
     // Find incident proton pair
     if ( p->mother() == nullptr and std::abs(p->eta()) > 5 and std::abs(p->pz()) > 1000 ) {
       if ( !parton1 and p->pz() > 0 ) {
         parton1 = p;
         hepmc_parton1 = hepmc_particle;
       }
       else if ( !parton2 and p->pz() < 0 ) {
         parton2 = p;
         hepmc_parton2 = hepmc_particle;
       }
     }
   }
 
   HepMC::GenVertex* vertex1 = nullptr;
   HepMC::GenVertex* vertex2 = nullptr;
   if ( parton1 == nullptr and parton2 == nullptr ) {
     // Particle gun samples do not have incident partons. Put dummy incident particle and prod vertex
     // Note: leave parton1 and parton2 as nullptr since it is not used anymore after creating hepmc_parton1 and 2
     const reco::Candidate::LorentzVector nullP4(0,0,0,0);
     const reco::Candidate::LorentzVector beamP4(0,0,cmEnergy_/2, cmEnergy_/2);
     vertex1 = new HepMC::GenVertex(FourVector(nullP4));
     vertex2 = new HepMC::GenVertex(FourVector(nullP4));
     hepmc_parton1 =  new HepMC::GenParticle(FourVector(+beamP4), 2212, 4);
     hepmc_parton2 =  new HepMC::GenParticle(FourVector(-beamP4), 2212, 4);
   }
   else {
     // Put incident beam particles : proton -> parton vertex
     vertex1 = new HepMC::GenVertex(FourVector(parton1->vertex()));
     vertex2 = new HepMC::GenVertex(FourVector(parton2->vertex()));
   }
   hepmc_event->add_vertex(vertex1);
   hepmc_event->add_vertex(vertex2);
   vertex1->add_particle_in(hepmc_parton1);
   vertex2->add_particle_in(hepmc_parton2);
   //hepmc_event->set_beam_particles(hepmc_parton1, hepmc_parton2);
 
   // Prepare vertex list
   typedef std::map<const reco::Candidate*, HepMC::GenVertex*> ParticleToVertexMap;
   ParticleToVertexMap particleToVertexMap;
   particleToVertexMap[parton1] = vertex1;
   particleToVertexMap[parton2] = vertex2;
   for ( unsigned int i=0, n=genParticlesHandle->size(); i<n; ++i )
   {
     const reco::Candidate* p = &genParticlesHandle->at(i);
     if ( p == parton1 or p == parton2 ) continue;
 
     // Connect mother-daughters for the other cases
     for ( unsigned int j=0, nMothers=p->numberOfMothers(); j<nMothers; ++j )
     {
       // Mother-daughter hierarchy defines vertex
       const reco::Candidate* elder = p->mother(j)->daughter(0);
       HepMC::GenVertex* vertex;
       if ( particleToVertexMap.find(elder) == particleToVertexMap.end() )
       {
         vertex = new HepMC::GenVertex(FourVector(elder->vertex()));
         hepmc_event->add_vertex(vertex);
         particleToVertexMap[elder] = vertex;
       }
       else
       {
         vertex = particleToVertexMap[elder];
       }
 
       // Vertex is found. Now connect each other
       const reco::Candidate* mother = p->mother(j);
       vertex->add_particle_in(genCandToHepMCMap[mother]);
       vertex->add_particle_out(hepmc_particles[i]);
     }
   }
 
   // Finalize HepMC event record
   bool hasSignalVertex = false;
   if ( !signalParticlePdgIds_.empty() ) {
     // Loop over all vertices to assign the signal vertex, decaying to a signal particle
     for ( auto v = hepmc_event->vertices_begin(); v != hepmc_event->vertices_end(); ++v ) {
       for ( auto p = (*v)->particles_begin(HepMC::children);
             p != (*v)->particles_end(HepMC::children); ++p ) {
         const int pdgId = (*p)->pdg_id();
         if ( std::find(signalParticlePdgIds_.begin(), signalParticlePdgIds_.end(), pdgId) != signalParticlePdgIds_.end() ) {
           hepmc_event->set_signal_process_vertex(*v);
           hasSignalVertex = true;
           break;
         }
       }
       if ( hasSignalVertex ) break;
     }
   }
   // Set the default signal vertex if still not set
   if ( !hasSignalVertex ) hepmc_event->set_signal_process_vertex(*(vertex1->vertices_begin()));
 
   std::unique_ptr<edm::HepMCProduct> hepmc_product(new edm::HepMCProduct());
   hepmc_product->addHepMCData(hepmc_event);
   event.put(std::move(hepmc_product), "unsmeared");
 
 }