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ElectronMCTruthFinder.cc

Go to the documentation of this file.

#include "RecoEgamma/EgammaMCTools/interface/ElectronMCTruthFinder.h"


#include <algorithm>                                                          

ElectronMCTruthFinder::ElectronMCTruthFinder() {
  
  
}

ElectronMCTruthFinder::~ElectronMCTruthFinder() 
{
  
}


std::vector<ElectronMCTruth> ElectronMCTruthFinder::find(std::vector<SimTrack> theSimTracks, std::vector<SimVertex> theSimVertices ) {
  //std::cout << "  ElectronMCTruthFinder::find " << std::endl;
  
  
  
  
  std::vector<ElectronMCTruth> result;
  
  // Local variables  
  const int SINGLE=1;
  const int DOUBLE=2;
  const int PYTHIA=3;
  const int ELECTRON_FLAV=1;
  const int PIZERO_FLAV=2;
  const int PHOTON_FLAV=3;
  
  int ievtype=0;
  int ievflav=0;
  
  
  std::vector<SimTrack> electronTracks;
  SimVertex primVtx;   
  
  fill(theSimTracks,  theSimVertices);
  
  int iPV=-1;   
  int partType1=0;
  int partType2=0;
  std::vector<SimTrack>::iterator iFirstSimTk = theSimTracks.begin();
  if (  !(*iFirstSimTk).noVertex() ) {
    iPV =  (*iFirstSimTk).vertIndex();
    
    int vtxId =   (*iFirstSimTk).vertIndex();
    primVtx = theSimVertices[vtxId];
    
    partType1 = (*iFirstSimTk).type();
    
    
    //std::cout <<  " Primary vertex id " << iPV << " first track type " << (*iFirstSimTk).type() << std::endl;  
  } else {
    //std::cout << " First track has no vertex " << std::endl;
  }
  
  // HepLorentzVector primVtxPos= primVtx.position(); 
  math::XYZTLorentzVectorD primVtxPos(primVtx.position().x(),
                                      primVtx.position().y(),
                                      primVtx.position().z(),
                                      primVtx.position().e());
  
  // Look at a second track
  iFirstSimTk++;
  if ( iFirstSimTk!=  theSimTracks.end() ) {
    
    if (  (*iFirstSimTk).vertIndex() == iPV) {
      partType2 = (*iFirstSimTk).type();  
  
      //std::cout <<  " second track type " << (*iFirstSimTk).type() << " vertex " <<  (*iFirstSimTk).vertIndex() << std::endl;  
      
    } else {
      //std::cout << " Only one kine track from Primary Vertex " << std::endl;
    }
  }
  
  //std::cout << " Loop over all particles " << std::endl;
  
  int npv=0;
  for (std::vector<SimTrack>::iterator iSimTk = theSimTracks.begin(); iSimTk != theSimTracks.end(); ++iSimTk){
    if (  (*iSimTk).noVertex() ) continue;
    
    int vertexId = (*iSimTk).vertIndex();
    SimVertex vertex = theSimVertices[vertexId];
    
    //std::cout << " Particle type " <<  (*iSimTk).type() << " Sim Track ID " << (*iSimTk).trackId() << " momentum " << (*iSimTk).momentum() <<  " vertex position " << vertex.position() << " vertex ID " << vertexId  << std::endl;  
    if ( (*iSimTk).vertIndex() == iPV ) {
      npv++;
      if ( fabs((*iSimTk).type() ) == 11) {
        //std::cout << " Found a primary electron with ID  " << (*iSimTk).trackId() << " momentum " << (*iSimTk).momentum() <<  std::endl;
        electronTracks.push_back( *iSimTk );
      }
    }
  }
  //std::cout << " There are " << npv << " particles originating in the PV " << std::endl;
    
  
  if(npv > 4) {
    ievtype = PYTHIA;
  } else if(npv == 1) {
    if( abs(partType1) == 11 ) {
      ievtype = SINGLE; ievflav = ELECTRON_FLAV;
    } else if(partType1 == 111) {
      ievtype = SINGLE; ievflav = PIZERO_FLAV;
    } else if(partType1 == 22) {
      ievtype = SINGLE; ievflav = PHOTON_FLAV;
    }
  } else if(npv == 2) {
    if (  abs(partType1) == 11 && abs(partType2) == 11 ) {
      ievtype = DOUBLE; ievflav = ELECTRON_FLAV;
    } else if(partType1 == 111 && partType2 == 111)   {
      ievtype = DOUBLE; ievflav = PIZERO_FLAV;
    } else if(partType1 == 22 && partType2 == 22)   {
      ievtype = DOUBLE; ievflav = PHOTON_FLAV;
    }
  }



  std::vector<Hep3Vector> bremPos;  
  std::vector<HepLorentzVector> pBrem;
  std::vector<float> xBrem;
 
  
  for (std::vector<SimTrack>::iterator iEleTk = electronTracks.begin(); iEleTk != electronTracks.end(); ++iEleTk){
    //std::cout << " Looping on the primary electron pt  " << std::sqrt((*iEleTk).momentum().perp2()) << " electron track ID " << (*iEleTk).trackId() << std::endl;
    
    
    
    SimTrack trLast =(*iEleTk); 
    int eleId = (*iEleTk).trackId();
    float remainingEnergy =trLast.momentum().e();
//    HepLorentzVector motherMomentum = (*iEleTk).momentum();
//    HepLorentzVector primEleMom = (*iEleTk).momentum();
    math::XYZTLorentzVectorD motherMomentum((*iEleTk).momentum().x(),
                                            (*iEleTk).momentum().y(),
                                            (*iEleTk).momentum().z(),
                                            (*iEleTk).momentum().e());
    math::XYZTLorentzVectorD primEleMom(motherMomentum);
    int eleVtxIndex= (*iEleTk).vertIndex();
    
    bremPos.clear();
    pBrem.clear();
    xBrem.clear();     

   
    for (std::vector<SimTrack>::iterator iSimTk = theSimTracks.begin(); iSimTk != theSimTracks.end(); ++iSimTk){
        
      if (  (*iSimTk).noVertex() )                    continue;
      if ( (*iSimTk).vertIndex() == iPV )             continue;

      //std::cout << " (*iEleTk)->trackId() " << (*iEleTk).trackId() << " (*iEleTk)->vertIndex() "<< (*iEleTk).vertIndex()  << " (*iSimTk).vertIndex() "  <<  (*iSimTk).vertIndex() << " (*iSimTk).type() " <<   (*iSimTk).type() << " (*iSimTk).trackId() " << (*iSimTk).trackId() << std::endl;
      
      int vertexId1 = (*iSimTk).vertIndex();
      SimVertex vertex1 = theSimVertices[vertexId1];
      int vertexId2 = trLast.vertIndex();
      SimVertex vertex2 = theSimVertices[vertexId2];
      
      
      int motherId=-1;
      
      if(  (  vertexId1 ==  vertexId2 ) && ( (*iSimTk).type() == (*iEleTk).type() ) && trLast.type() == 22   ) {
        //std::cout << " Here a e/gamma brem vertex " << std::endl;
        
        //std::cout << " Secondary from electron:  particle1  type " << (*iSimTk).type() << " trackId " << (*iSimTk).trackId() << " vertex ID " << vertexId1 << " vertex position " << std::sqrt(vertex1.position().perp2()) << " parent index "<< vertex1.parentIndex() << std::endl;
        
        //std::cout << " Secondary from electron:  particle2  type " << trLast.type() << " trackId " <<  trLast.trackId()<< " vertex ID " << vertexId2 << " vertex position " << std::sqrt(vertex2.position().perp2()) << " parent index " << vertex2.parentIndex() << std::endl;
        
        //std::cout << " Electron pt " << std::sqrt((*iSimTk).momentum().perp2()) << " photon pt " <<  std::sqrt(trLast.momentum().perp2()) << "Mother electron pt " <<  sqrt(motherMomentum.perp2()) << std::endl;
        //std::cout << " eleId " << eleId << std::endl;
        float eLoss = remainingEnergy - ( (*iSimTk).momentum() + trLast.momentum()).e();
        //std::cout << " eLoss " << eLoss << std::endl;              


        if ( vertex1.parentIndex()  ) {
          
          unsigned  motherGeantId = vertex1.parentIndex(); 
          std::map<unsigned, unsigned >::iterator association = geantToIndex_.find( motherGeantId );
          if(association != geantToIndex_.end() )
            motherId = association->second;
          
          int motherType = motherId == -1 ? 0 : theSimTracks[motherId].type();
          //std::cout << " Parent to this vertex   motherId " << motherId << " mother type " <<  motherType << " Sim track ID " <<  theSimTracks[motherId].trackId() << std::endl; 
          if ( theSimTracks[motherId].trackId() == eleId ) {
            
            //std::cout << "  ***** Found the Initial Mother Electron ****   theSimTracks[motherId].trackId() " <<  theSimTracks[motherId].trackId() << " eleId " <<  eleId << std::endl;
            eleId= (*iSimTk).trackId();
            remainingEnergy =   (*iSimTk).momentum().e();
            motherMomentum = (*iSimTk).momentum();
            
            
            pBrem.push_back( HepLorentzVector(trLast.momentum().px(),trLast.momentum().py(),
                                              trLast.momentum().pz(),trLast.momentum().e()) );
            bremPos.push_back( HepLorentzVector(vertex1.position().x(),vertex1.position().y(),
                                                vertex1.position().z(),vertex1.position().t()) );
            xBrem.push_back(eLoss);
            
          }
          
          
          
          
        } else {
          //std::cout << " This vertex has no parent tracks " <<  std::endl;
        }
        
      }
      trLast=(*iSimTk);
      
    } // End loop over all SimTracks 
    //std::cout << " Going to build the ElectronMCTruth: pBrem size " << pBrem.size() << std::endl;
    HepLorentzVector tmpEleMom(primEleMom.px(),primEleMom.py(),
                               primEleMom.pz(),primEleMom.e() ) ;
    HepLorentzVector tmpVtxPos(primVtxPos.x(),primVtxPos.y(),primVtxPos.z(),primVtxPos.t());
    result.push_back ( ElectronMCTruth( tmpEleMom, eleVtxIndex,  bremPos, pBrem, xBrem,  tmpVtxPos,(*iEleTk)  )  ) ;

    
  } // End loop over primary electrons 
  
    
   
   return result;
}



void ElectronMCTruthFinder::fill(std::vector<SimTrack>& simTracks, 
                                 std::vector<SimVertex>& simVertices ) {
  //std::cout << "  ElectronMCTruthFinder::fill " << std::endl;

  unsigned nVtx = simVertices.size();
  unsigned nTks = simTracks.size();

  // Empty event, do nothin'
  if ( nVtx == 0 ) return;

  // create a map associating geant particle id and position in the 
  // event SimTrack vector
  for( unsigned it=0; it<nTks; ++it ) {
    geantToIndex_[ simTracks[it].trackId() ] = it;
    //std::cout << " ElectronMCTruthFinder::fill it " << it << " simTracks[it].trackId() " <<  simTracks[it].trackId() << std::endl;
 
  }  


}

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