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bendavid |
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// $Id: FillerMCParticles.cc,v 1.13 2008/07/14 21:01:00 loizides Exp $
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#include "MitProd/TreeFiller/interface/FillerMCParticles.h"
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#include "FWCore/MessageLogger/interface/MessageLogger.h"
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#include "DataFormats/Common/interface/Handle.h"
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#include "SimDataFormats/HepMCProduct/interface/HepMCProduct.h"
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#include "SimDataFormats/TrackingAnalysis/interface/TrackingParticle.h"
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#include "SimDataFormats/TrackingAnalysis/interface/TrackingParticleFwd.h"
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#include "SimDataFormats/TrackingAnalysis/interface/TrackingVertex.h"
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#include "SimDataFormats/TrackingAnalysis/interface/TrackingVertexContainer.h"
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#include "MitAna/DataTree/interface/Names.h"
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using namespace std;
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using namespace edm;
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using namespace mithep;
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//--------------------------------------------------------------------------------------------------
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FillerMCParticles::FillerMCParticles(const ParameterSet &cfg, const char *name, bool active) :
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BaseFiller(cfg, name, active),
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genActive_(Conf().getUntrackedParameter<bool>("genActive",true)),
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simActive_(Conf().getUntrackedParameter<bool>("simActive",true)),
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genEdmName_(Conf().getUntrackedParameter<string>("genEdmName","source")),
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simEdmName_(Conf().getUntrackedParameter<string>("simEdmName","mergedtruth:MergedTrackTruth")),
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mitName_(Conf().getUntrackedParameter<string>("mitName",Names::gkMCPartBrn)),
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mcParticles_(new mithep::MCParticleArr(250)),
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genMap_(new mithep::GenParticleMap),
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simMap_(new mithep::SimParticleMap)
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{
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// Constructor.
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}
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//--------------------------------------------------------------------------------------------------
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FillerMCParticles::~FillerMCParticles()
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{
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// Destructor.
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delete mcParticles_;
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delete genMap_;
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delete simMap_;
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}
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//--------------------------------------------------------------------------------------------------
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void FillerMCParticles::BookDataBlock(TreeWriter &tws)
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{
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// Add branch to tree.
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tws.AddBranch(mitName_.c_str(),&mcParticles_);
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}
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//--------------------------------------------------------------------------------------------------
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void FillerMCParticles::FillDataBlock(const edm::Event &event,
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const edm::EventSetup &setup)
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{
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// Loop over HepMC particle and fill their information.
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genMap_->Reset();
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simMap_->Reset();
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mcParticles_->Reset();
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if (genActive_) {
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Handle<edm::HepMCProduct> hHepMCProduct;
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GetProduct(genEdmName_, hHepMCProduct, event);
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const HepMC::GenEvent &GenEvent = hHepMCProduct->getHepMCData();
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//loop over all hepmc particles and copy their information
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for (HepMC::GenEvent::particle_const_iterator pgen = GenEvent.particles_begin();
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pgen != GenEvent.particles_end(); ++pgen) {
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HepMC::GenParticle *mcPart = (*pgen);
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if(!mcPart) continue;
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mithep::MCParticle *genParticle = mcParticles_->Allocate();
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new (genParticle) mithep::MCParticle(mcPart->momentum().x(),mcPart->momentum().y(),
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mcPart->momentum().z(),mcPart->momentum().e(),
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mcPart->pdg_id(),
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mcPart->status());
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genParticle->SetIsGenerated();
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genMap_->Add(mcPart->barcode(), genParticle);
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}
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}
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if (simActive_) {
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Handle<TrackingParticleCollection> hTrackingParticleProduct;
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GetProduct(simEdmName_, hTrackingParticleProduct, event);
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const TrackingParticleCollection trackingParticles = *(hTrackingParticleProduct.product());
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// loop through all simParticles
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for (TrackingParticleCollection::const_iterator iM = trackingParticles.begin();
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iM != trackingParticles.end(); ++iM) {
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TrackingParticleRef theRef(hTrackingParticleProduct, iM-trackingParticles.begin());
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mithep::MCParticle *outSimParticle;
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if (genActive_ && iM->genParticle().size()) {
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const HepMC::GenParticle *mcPart = iM->genParticle_begin()->get();
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outSimParticle=genMap_->GetMit(mcPart->barcode());
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outSimParticle->SetStatus(iM->status());
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}
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else {
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outSimParticle = mcParticles_->Allocate();
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new (outSimParticle) mithep::MCParticle(iM->px(),iM->py(),iM->pz(),iM->energy(),iM->pdgId(), iM->status());
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}
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outSimParticle->SetIsSimulated();
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simMap_->Add(theRef, outSimParticle);
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}
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}
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mcParticles_->Trim();
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}
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//--------------------------------------------------------------------------------------------------
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void FillerMCParticles::ResolveLinks(const edm::Event &event,
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const edm::EventSetup &setup)
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{
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// Loop over HepMC particle and resolve their links.
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if (genActive_) {
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Handle<edm::HepMCProduct> hHepMCProduct;
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GetProduct(genEdmName_, hHepMCProduct, event);
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const HepMC::GenEvent &GenEvent = hHepMCProduct->getHepMCData();
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for (HepMC::GenEvent::particle_const_iterator pgen = GenEvent.particles_begin();
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pgen != GenEvent.particles_end(); ++pgen) {
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HepMC::GenParticle *mcPart = (*pgen);
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if(!mcPart) continue;
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//check if genpart has a decay vertex
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HepMC::GenVertex *dVertex = mcPart->end_vertex();
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if (!dVertex) continue;
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//find corresponding mithep genparticle parent in association table
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mithep::MCParticle *genParent = genMap_->GetMit(mcPart->barcode());
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if (genParent->IsSimulated()) continue;
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//set decay vertex
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//division by 10.0 is needed due to HepMC use of mm instead of cm for distance units
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genParent->SetVertex(dVertex->point3d().x()/10.0,
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dVertex->point3d().y()/10.0,
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dVertex->point3d().z()/10.0);
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//loop through daugthers
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for (HepMC::GenVertex::particles_out_const_iterator pgenD = dVertex->particles_out_const_begin();
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pgenD != dVertex->particles_out_const_end(); ++pgenD) {
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HepMC::GenParticle *mcDaughter = (*pgenD);
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mithep::MCParticle *genDaughter = genMap_->GetMit(mcDaughter->barcode());
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genParent->AddDaughter(genDaughter);
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if (!(genDaughter->HasMother()))
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genDaughter->SetMother(genParent);
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}
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}
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}
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if (simActive_) {
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Handle<TrackingParticleCollection> hTrackingParticleProduct;
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GetProduct(simEdmName_, hTrackingParticleProduct, event);
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const TrackingParticleCollection trackingParticles = *(hTrackingParticleProduct.product());
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// loop through all simParticles
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for (TrackingParticleCollection::const_iterator iM = trackingParticles.begin();
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iM != trackingParticles.end(); ++iM) {
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if (iM->decayVertices().size() <= 0)
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continue;
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TrackingParticleRef theRef(hTrackingParticleProduct, iM-trackingParticles.begin());
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mithep::MCParticle *simParent = simMap_->GetMit(theRef);
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for (TrackingVertexRefVector::iterator v= iM->decayVertices().begin();
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v != iM->decayVertices().end(); ++v) {
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for (TrackingParticleRefVector::iterator pd = v->get()->daughterTracks().begin();
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pd != v->get()->daughterTracks().end(); ++pd) {
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mithep::MCParticle *simDaughter = simMap_->GetMit(*pd);
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simParent->AddDaughter(simDaughter);
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simDaughter->SetMother(simParent);
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}
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if (v == iM->decayVertices().end()-1) {
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simParent->SetVertex(v->get()->position().x(),
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v->get()->position().y(),
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v->get()->position().z());
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}
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}
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}
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}
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}
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