PFSimParticleProducer.cc

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#include "RecoParticleFlow/PFSimProducer/plugins/PFSimParticleProducer.h"

#include "RecoParticleFlow/PFClusterTools/interface/PFEnergyCalibration.h"
#include "RecoParticleFlow/PFClusterTools/interface/PFEnergyResolution.h"

#include "DataFormats/ParticleFlowReco/interface/PFLayer.h"
#include "DataFormats/ParticleFlowReco/interface/PFCluster.h"

#include "DataFormats/ParticleFlowReco/interface/PFSimParticle.h"
#include "DataFormats/ParticleFlowReco/interface/PFSimParticleFwd.h"

// include files used for reconstructed tracks
// #include "DataFormats/TrackReco/interface/Track.h"
// #include "DataFormats/TrackReco/interface/TrackFwd.h"
// #include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"
// #include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"
// #include "DataFormats/TrackCandidate/interface/TrackCandidate.h"
// #include "DataFormats/TrackCandidate/interface/TrackCandidateCollection.h"
// #include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"

#include "FWCore/Framework/interface/ESHandle.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
#include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/GeometrySurface/interface/BoundCylinder.h"
#include "DataFormats/GeometrySurface/interface/TkRotation.h"
#include "DataFormats/GeometrySurface/interface/SimpleCylinderBounds.h"
#include "DataFormats/GeometrySurface/interface/SimpleDiskBounds.h"
#include "TrackingTools/Records/interface/TrackingComponentsRecord.h" 
#include "TrackingTools/Records/interface/TransientRecHitRecord.h"  
#include "TrackingTools/PatternTools/interface/Trajectory.h"
#include "TrackingTools/TrackFitters/interface/TrajectoryFitter.h"
// #include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "FWCore/Framework/interface/EventSetup.h"

#include "SimGeneral/HepPDTRecord/interface/ParticleDataTable.h"
#include "FastSimulation/Event/interface/FSimEvent.h"
#include "FastSimulation/Event/interface/FSimTrack.h"
#include "FastSimulation/Event/interface/FSimVertex.h"

#include "SimDataFormats/CaloHit/interface/PCaloHit.h"
#include "SimDataFormats/CaloHit/interface/PCaloHitContainer.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"
#include "DataFormats/EcalRecHit/interface/EcalRecHit.h"
#include "DataFormats/EcalRecHit/interface/EcalRecHitCollections.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrack.h"
#include "DataFormats/TrackReco/interface/Track.h" 
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHit.h" 

#include <set>
#include <sstream>

using namespace std;
using namespace edm;

PFSimParticleProducer::PFSimParticleProducer(const edm::ParameterSet& iConfig) 
{


  processParticles_ = 
    iConfig.getUntrackedParameter<bool>("process_Particles",true);
    
  
  inputTagSim_ = iConfig.getParameter<InputTag>("sim"); 
  tokenSim_    = consumes<std::vector<SimTrack> >(inputTagSim_);
  tokenSimVertices_    = consumes<std::vector<SimVertex> >(inputTagSim_);

  //retrieving collections for MC Truth Matching

  //modif-beg
  inputTagFastSimProducer_  = iConfig.getUntrackedParameter<InputTag>("fastSimProducer");
  tokenFastSimProducer_  = consumes<edm::PCaloHitContainer>(inputTagFastSimProducer_);
  mctruthMatchingInfo_ = 
    iConfig.getUntrackedParameter<bool>("MCTruthMatchingInfo",false);
  //modif-end

  inputTagRecTracks_ = iConfig.getParameter<InputTag>("RecTracks");
  tokenRecTracks_    = consumes<reco::PFRecTrackCollection>(inputTagRecTracks_);

  inputTagEcalRecHitsEB_ = iConfig.getParameter<InputTag>("ecalRecHitsEB");
  tokenEcalRecHitsEB_    = consumes<EcalRecHitCollection>(inputTagEcalRecHitsEB_);
  inputTagEcalRecHitsEE_ = iConfig.getParameter<InputTag>("ecalRecHitsEE");
  tokenEcalRecHitsEE_ 
    = consumes<EcalRecHitCollection>(inputTagEcalRecHitsEE_);

  verbose_ = 
    iConfig.getUntrackedParameter<bool>("verbose",false);


  // register products
  produces<reco::PFSimParticleCollection>();
  
  particleFilter_ = iConfig.getParameter<ParameterSet>
    ( "ParticleFilter" );   
  
  mySimEvent =  new FSimEvent( particleFilter_ );
}



PFSimParticleProducer::~PFSimParticleProducer() 
{ 
  delete mySimEvent; 
}

void PFSimParticleProducer::produce(Event& iEvent, 
                    const EventSetup& iSetup) 
{  
  // init Particle data table (from Pythia)
  edm::ESHandle < HepPDT::ParticleDataTable > pdt;
  //  edm::ESHandle < DefaultConfig::ParticleDataTable > pdt;
  iSetup.getData(pdt);
  mySimEvent->initializePdt(&(*pdt));

 LogDebug("PFSimParticleProducer")<<"START event: "<<iEvent.id().event()
                   <<" in run "<<iEvent.id().run()<<endl;
 
  //MC Truth Matching only with Famos and UnFoldedMode option to true!!

  //vector to store the trackIDs of rectracks corresponding
  //to the simulated particle.
  std::vector<unsigned> recTrackSimID;
  
  //In order to know which simparticule contribute to 
  //a given Ecal RecHit energy, we need to access 
  //the PCAloHit from FastSim. 
  
  typedef std::pair<double, unsigned> hitSimID;
  typedef std::list< std::pair<double, unsigned> >::iterator ITM;
  std::vector< std::list <hitSimID> > caloHitsEBID(62000);
  std::vector<double> caloHitsEBTotE(62000,0.0);
  
  if(mctruthMatchingInfo_){
     
    //getting the PCAloHit
    edm::Handle<edm::PCaloHitContainer> pcalohits;
    //   bool found_phit 
    //     = iEvent.getByLabel("fastSimProducer","EcalHitsEB",
    //          pcalohits);  
    //modif-beg
    bool found_phit 
      = iEvent.getByToken(tokenFastSimProducer_,pcalohits);
    //modif-end
    
    if(!found_phit) {
      ostringstream err;
      err<<"could not find pcaloHit "<<"fastSimProducer:EcalHitsEB";
      LogError("PFSimParticleProducer")<<err.str()<<endl;
      
      throw cms::Exception( "MissingProduct", err.str());
    }
    else {
      assert( pcalohits.isValid() );

      edm::PCaloHitContainer::const_iterator it    
    = pcalohits.product()->begin();
      edm::PCaloHitContainer::const_iterator itend 
    = pcalohits.product()->end();
      
      //loop on the PCaloHit from FastSim Calorimetry
      for(;it!=itend;++it)
    {
      EBDetId detid(it->id());
      
      if(it->energy() > 0.0) {
        std::pair<double, unsigned> phitsimid
          = make_pair(it->energy(),it->geantTrackId());
        caloHitsEBID[detid.hashedIndex()].push_back(phitsimid);
        caloHitsEBTotE[detid.hashedIndex()] 
          += it->energy(); //summing pcalhit energy   
      }//energy > 0
      
    }//loop PcaloHits    
    }//pcalohit handle access
    
    //Retrieving the PFRecTrack collection for
    //Monte Carlo Truth Matching tool
    Handle< reco::PFRecTrackCollection > recTracks;
    try{      
      LogDebug("PFSimParticleProducer")<<"getting PFRecTracks"<<endl;
      iEvent.getByToken(tokenRecTracks_, recTracks);
      
    } catch (cms::Exception& err) { 
      LogError("PFSimParticleProducer")<<err
                       <<" cannot get collection "
                       <<"particleFlowBlock"<<":"
                       <<""
                       <<endl;
    }//pfrectrack handle access
    
    //getting the simID corresponding to 
    //each of the PFRecTracks
    getSimIDs( recTracks, recTrackSimID );
    
  }//mctruthMatchingInfo_ //modif
  
  // deal with true particles 
  if( processParticles_) {

    auto pOutputPFSimParticleCollection = std::make_unique<reco::PFSimParticleCollection>(); 

    Handle<vector<SimTrack> > simTracks;
    bool found = iEvent.getByToken(tokenSim_,simTracks);
    if(!found) {

      ostringstream err;
      err<<"cannot find sim tracks: "<<inputTagSim_;
      LogError("PFSimParticleProducer")<<err.str()<<endl;
      
      throw cms::Exception( "MissingProduct", err.str());
    }
      
    
    
    Handle<vector<SimVertex> > simVertices;
    found = iEvent.getByToken(tokenSimVertices_,simVertices);
    if(!found) {
      LogError("PFSimParticleProducer")
    <<"cannot find sim vertices: "<<inputTagSim_<<endl;
      return;
    }

    mySimEvent->fill( *simTracks, *simVertices );
      
    if(verbose_) 
      mySimEvent->print();

    for(unsigned i=0; i<mySimEvent->nTracks(); i++) {
    
      const FSimTrack& fst = mySimEvent->track(i);

      int motherId = -1;
      if( ! fst.noMother() ) // a mother exist
    motherId = fst.mother().id();

      //This is finding out the simID corresponding 
      //to the recTrack

      //GETTING THE TRACK ID
      unsigned         recTrackID = 99999;
      vector<unsigned> recHitContrib; //modif
      vector<double>   recHitContribFrac; //modif

      if(mctruthMatchingInfo_){ //modif

    for(unsigned lo=0; lo<recTrackSimID.size(); 
        lo++) {
      if( i == recTrackSimID[lo] ) {

        recTrackID = lo;
      }//match track
    }//loop rectrack
    
    // get the ecalBarrel rechits for MC truth matching tool
    edm::Handle<EcalRecHitCollection> rhcHandle;
    bool found = iEvent.getByToken(tokenEcalRecHitsEB_, 
                       rhcHandle);
    if(!found) {
      ostringstream err;
      err<<"could not find rechits "<< inputTagEcalRecHitsEB_;
      LogError("PFSimParticleProducer")<<err.str()<<endl;
      
      throw cms::Exception( "MissingProduct", err.str());
    }
    else {
      assert( rhcHandle.isValid() );
      
      EBRecHitCollection::const_iterator it_rh    
        = rhcHandle.product()->begin();
      EBRecHitCollection::const_iterator itend_rh 
        = rhcHandle.product()->end();
      
      for(;it_rh!=itend_rh;++it_rh)
        {
          unsigned rhit_hi 
        = EBDetId(it_rh->id()).hashedIndex();
          EBDetId detid(it_rh->id());
        
          ITM it_phit    = caloHitsEBID[rhit_hi].begin();
          ITM itend_phit = caloHitsEBID[rhit_hi].end();    
          for(;it_phit!=itend_phit;++it_phit)
        {
          if(i == it_phit->second)
            {
              //Alex (08/10/08) TO BE REMOVED, eliminating
              //duplicated rechits
              bool alreadyin = false;
              for( unsigned ihit = 0; ihit < recHitContrib.size(); 
               ++ihit )
            if(detid.rawId() == recHitContrib[ihit]) 
              alreadyin = true;
              
              if(!alreadyin){       
            double pcalofraction = 0.0;
            if(caloHitsEBTotE[rhit_hi] != 0.0)
              pcalofraction 
                = (it_phit->first/caloHitsEBTotE[rhit_hi])*100.0;
            
            //store info
            recHitContrib.push_back(it_rh->id());
            recHitContribFrac.push_back(pcalofraction);
              }//selected rechits       
            }//matching
        }//loop pcalohit
          
        }//loop rechits
      
    }//getting the rechits

      }//mctruthMatchingInfo_ //modif

      reco::PFSimParticle particle(  fst.charge(), 
                     fst.type(), 
                     fst.id(), 
                     motherId,
                     fst.daughters(),
                     recTrackID,
                     recHitContrib,
                     recHitContribFrac);


      const FSimVertex& originVtx = fst.vertex();

      math::XYZPoint          posOrig( originVtx.position().x(), 
                       originVtx.position().y(), 
                       originVtx.position().z() );

      math::XYZTLorentzVector momOrig( fst.momentum().px(), 
                       fst.momentum().py(), 
                       fst.momentum().pz(), 
                       fst.momentum().e() );
      reco::PFTrajectoryPoint 
    pointOrig(-1, 
          reco::PFTrajectoryPoint::ClosestApproach,
          posOrig, momOrig);

      // point 0 is origin vertex
      particle.addPoint(pointOrig);
    

      if( ! fst.noEndVertex() ) {
    const FSimVertex& endVtx = fst.endVertex();
    
    math::XYZPoint          posEnd( endVtx.position().x(), 
                    endVtx.position().y(), 
                    endVtx.position().z() );
    
    math::XYZTLorentzVector momEnd;
    
    reco::PFTrajectoryPoint 
      pointEnd( -1, 
            reco::PFTrajectoryPoint::BeamPipeOrEndVertex,
            posEnd, momEnd);
    
    particle.addPoint(pointEnd);
      }
      else { // add a dummy point
    reco::PFTrajectoryPoint dummy;
    particle.addPoint(dummy); 
      }


      if( fst.onLayer1() ) { // PS layer1
    const RawParticle& rp = fst.layer1Entrance();
      
    math::XYZPoint posLayer1( rp.x(), rp.y(), rp.z() );
    math::XYZTLorentzVector momLayer1( rp.px(), rp.py(), rp.pz(), rp.e() );
    reco::PFTrajectoryPoint layer1Pt(-1, reco::PFTrajectoryPoint::PS1, 
                     posLayer1, momLayer1);
    
    particle.addPoint( layer1Pt ); 

    // extrapolate to cluster depth
      }
      else { // add a dummy point
    reco::PFTrajectoryPoint dummy;
    particle.addPoint(dummy); 
      }

      if( fst.onLayer2() ) { // PS layer2
    const RawParticle& rp = fst.layer2Entrance();
      
    math::XYZPoint posLayer2( rp.x(), rp.y(), rp.z() );
    math::XYZTLorentzVector momLayer2( rp.px(), rp.py(), rp.pz(), rp.e() );
    reco::PFTrajectoryPoint layer2Pt(-1, reco::PFTrajectoryPoint::PS2, 
                     posLayer2, momLayer2);
    
    particle.addPoint( layer2Pt ); 

    // extrapolate to cluster depth
      }
      else { // add a dummy point
    reco::PFTrajectoryPoint dummy;
    particle.addPoint(dummy); 
      }

      if( fst.onEcal() ) {
    const RawParticle& rp = fst.ecalEntrance();
    
    math::XYZPoint posECAL( rp.x(), rp.y(), rp.z() );
    math::XYZTLorentzVector momECAL( rp.px(), rp.py(), rp.pz(), rp.e() );
    reco::PFTrajectoryPoint ecalPt(-1, 
                       reco::PFTrajectoryPoint::ECALEntrance, 
                       posECAL, momECAL);
    
    particle.addPoint( ecalPt ); 

    // extrapolate to cluster depth
      }
      else { // add a dummy point
    reco::PFTrajectoryPoint dummy;
    particle.addPoint(dummy); 
      }
    
      // add a dummy point for ECAL Shower max
      reco::PFTrajectoryPoint dummy;
      particle.addPoint(dummy); 

      if( fst.onHcal() ) {

    const RawParticle& rpin = fst.hcalEntrance();
    
    math::XYZPoint posHCALin( rpin.x(), rpin.y(), rpin.z() );
    math::XYZTLorentzVector momHCALin( rpin.px(), rpin.py(), rpin.pz(), 
                       rpin.e() );
    reco::PFTrajectoryPoint hcalPtin(-1, 
                     reco::PFTrajectoryPoint::HCALEntrance,
                     posHCALin, momHCALin);
    
    particle.addPoint( hcalPtin ); 

    const RawParticle& rpout = fst.hcalExit();
    
    math::XYZPoint posHCALout( rpout.x(), rpout.y(), rpout.z() );
    math::XYZTLorentzVector momHCALout( rpout.px(), rpout.py(), rpout.pz(),
                        rpout.e() );
    reco::PFTrajectoryPoint 
      hcalPtout(-1, reco::PFTrajectoryPoint::HCALExit, 
             posHCALout, momHCALout);
    
    particle.addPoint( hcalPtout );     

    const RawParticle& rpho = fst.hoEntrance();
    
    math::XYZPoint posHOEntrance( rpho.x(), rpho.y(), rpho.z() );
    math::XYZTLorentzVector momHOEntrance( rpho.px(), rpho.py(), rpho.pz(),
                        rpho.e() );
    reco::PFTrajectoryPoint 
      hoPtin(-1, reco::PFTrajectoryPoint::HOLayer, 
         posHOEntrance, momHOEntrance);
    
    particle.addPoint( hoPtin );    




      }
      else { // add a dummy point
    reco::PFTrajectoryPoint dummy;
    particle.addPoint(dummy); 
      }
          
      pOutputPFSimParticleCollection->push_back( particle );
    }
    
    iEvent.put(std::move(pOutputPFSimParticleCollection));
  }

  
  LogDebug("PFSimParticleProducer")<<"STOP event: "<<iEvent.id().event()
                   <<" in run "<<iEvent.id().run()<<endl;
}

void PFSimParticleProducer::getSimIDs( const TrackHandle& trackh,
                       std::vector<unsigned>& recTrackSimID )
{

  if( trackh.isValid() ) {

    for(unsigned i=0;i<trackh->size(); i++) {
      
      const reco::PFRecTrackRef ref( trackh,i );
      
      for(auto const& hit : ref->trackRef()->recHits())
      {
        if( hit->isValid() ) {

          auto rechit = dynamic_cast<const FastTrackerRecHit*>(hit);

          for(unsigned int st_index=0;st_index<rechit->nSimTrackIds();++st_index){
              recTrackSimID.push_back(rechit->simTrackId(st_index));
          }
          break;
        }
      }//loop track rechit
    }//loop recTracks
  }//track handle valid
}