ElectronSeedAnalyzer.cc

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// user include files
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
 
#include "DataFormats/EgammaReco/interface/ElectronSeedFwd.h"
#include "DataFormats/EgammaReco/interface/ElectronSeed.h"
#include "DataFormats/TrackerRecHit2D/interface/SiPixelRecHitCollection.h"
#include "DataFormats/EgammaReco/interface/SuperCluster.h"
#include "DataFormats/EgammaReco/interface/SuperClusterFwd.h"
#include "DataFormats/Common/interface/OwnVector.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"
#include "DataFormats/TrajectoryState/interface/PTrajectoryStateOnDet.h"
 
#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
 
#include "TrackingTools/DetLayers/interface/BarrelDetLayer.h"
#include "TrackingTools/DetLayers/interface/ForwardDetLayer.h"
#include "RecoTracker/TkDetLayers/interface/GeometricSearchTracker.h"
#include "RecoEgamma/Examples/plugins/ElectronSeedAnalyzer.h"
 
#include "TrackingTools/TrajectoryState/interface/ftsFromVertexToPoint.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/MaterialEffects/interface/PropagatorWithMaterial.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/PerpendicularBoundPlaneBuilder.h"
#include "TrackingTools/MaterialEffects/interface/PropagatorWithMaterial.h"
 
#include "DataFormats/TrackerCommon/interface/TrackerTopology.h"
#include "Geometry/Records/interface/TrackerTopologyRcd.h"
 
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
 
#include "DataFormats/BeamSpot/interface/BeamSpot.h"
 
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include "HepMC/GenParticle.h"
#include "HepMC/SimpleVector.h"
#include "CLHEP/Units/GlobalPhysicalConstants.h"
 
#include <iostream>
#include "TFile.h"
#include "TH1F.h"
#include "TH1I.h"
#include "TTree.h"
 
using namespace std;
using namespace reco;
 
ElectronSeedAnalyzer::ElectronSeedAnalyzer(const edm::ParameterSet &conf)
    : beamSpot_(conf.getParameter<edm::InputTag>("beamSpot")) {
  inputCollection_ = conf.getParameter<edm::InputTag>("inputCollection");
  histfile_ = new TFile("electronpixelseeds.root", "RECREATE");
}
 
void ElectronSeedAnalyzer::beginJob() {
  histfile_->cd();
  tree_ = new TTree("ElectronSeeds", "ElectronSeed validation ntuple");
  tree_->Branch("mcEnergy", mcEnergy, "mcEnergy[10]/F");
  tree_->Branch("mcEta", mcEta, "mcEta[10]/F");
  tree_->Branch("mcPhi", mcPhi, "mcPhi[10]/F");
  tree_->Branch("mcPt", mcPt, "mcPt[10]/F");
  tree_->Branch("mcQ", mcQ, "mcQ[10]/F");
  tree_->Branch("superclusterEnergy", superclusterEnergy, "superclusterEnergy[10]/F");
  tree_->Branch("superclusterEta", superclusterEta, "superclusterEta[10]/F");
  tree_->Branch("superclusterPhi", superclusterPhi, "superclusterPhi[10]/F");
  tree_->Branch("superclusterEt", superclusterEt, "superclusterEt[10]/F");
  tree_->Branch("seedMomentum", seedMomentum, "seedMomentum[10]/F");
  tree_->Branch("seedEta", seedEta, "seedEta[10]/F");
  tree_->Branch("seedPhi", seedPhi, "seedPhi[10]/F");
  tree_->Branch("seedPt", seedPt, "seedPt[10]/F");
  tree_->Branch("seedQ", seedQ, "seedQ[10]/F");
  tree_->Branch("seedSubdet1", seedSubdet1, "seedSubdet1[10]/I");
  tree_->Branch("seedLayer1", seedLayer1, "seedLayer1[10]/I");
  tree_->Branch("seedSide1", seedSide1, "seedSide1[10]/I");
  tree_->Branch("seedPhi1", seedPhi1, "seedPhi1[10]/F");
  tree_->Branch("seedDphi1", seedDphi1, "seedDphi1[10]/F");
  tree_->Branch("seedDrz1", seedDrz1, "seedDrz1[10]/F");
  tree_->Branch("seedRz1", seedRz1, "seedRz1[10]/F");
  tree_->Branch("seedSubdet2", seedSubdet2, "seedSubdet2[10]/I");
  tree_->Branch("seedLayer2", seedLayer2, "seedLayer2[10]/I");
  tree_->Branch("seedSide2", seedSide2, "seedSide2[10]/I");
  tree_->Branch("seedPhi2", seedPhi2, "seedPhi2[10]/F");
  tree_->Branch("seedDphi2", seedDphi2, "seedDphi2[10]/F");
  tree_->Branch("seedRz2", seedRz2, "seedRz2[10]/F");
  tree_->Branch("seedDrz2", seedDrz2, "seedDrz2[10]/F");
  histeMC_ = new TH1F("eMC", "MC particle energy", 100, 0., 100.);
  histeMCmatched_ = new TH1F("eMCmatched", "matched MC particle energy", 100, 0., 100.);
  histecaldriveneMCmatched_ =
      new TH1F("ecaldriveneMCmatched", "matched MC particle energy, ecal driven", 100, 0., 100.);
  histtrackerdriveneMCmatched_ =
      new TH1F("trackerdriveneMCmatched", "matched MC particle energy, tracker driven", 100, 0., 100.);
  histp_ = new TH1F("p", "seed p", 100, 0., 100.);
  histeclu_ = new TH1F("clus energy", "supercluster energy", 100, 0., 100.);
  histpt_ = new TH1F("pt", "seed pt", 100, 0., 100.);
  histptMC_ = new TH1F("ptMC", "MC particle pt", 100, 0., 100.);
  histptMCmatched_ = new TH1F("ptMCmatched", "matched MC particle pt", 100, 0., 100.);
  histecaldrivenptMCmatched_ = new TH1F("ecaldrivenptMCmatched", "matched MC particle pt, ecal driven", 100, 0., 100.);
  histtrackerdrivenptMCmatched_ =
      new TH1F("trackerdrivenptMCmatched", "matched MC particle pt, tracker driven", 100, 0., 100.);
  histetclu_ = new TH1F("Et", "supercluster Et", 100, 0., 100.);
  histeffpt_ = new TH1F("pt eff", "seed effciency vs pt", 100, 0., 100.);
  histeta_ = new TH1F("seed eta", "seed eta", 100, -2.5, 2.5);
  histetaMC_ = new TH1F("etaMC", "MC particle eta", 100, -2.5, 2.5);
  histetaMCmatched_ = new TH1F("etaMCmatched", "matched MC particle eta", 100, -2.5, 2.5);
  histecaldrivenetaMCmatched_ =
      new TH1F("ecaldrivenetaMCmatched", "matched MC particle eta, ecal driven", 100, -2.5, 2.5);
  histtrackerdrivenetaMCmatched_ =
      new TH1F("trackerdrivenetaMCmatched", "matched MC particle eta, tracker driven", 100, -2.5, 2.5);
  histetaclu_ = new TH1F("clus eta", "supercluster eta", 100, -2.5, 2.5);
  histeffeta_ = new TH1F("eta eff", "seed effciency vs eta", 100, -2.5, 2.5);
  histq_ = new TH1F("q", "seed charge", 100, -2.5, 2.5);
  histeoverp_ = new TH1F("E/p", "seed E/p", 100, 0., 10.);
  histnbseeds_ = new TH1I("nrs", "Nr of seeds ", 50, 0., 25.);
  histnbclus_ = new TH1I("nrclus", "Nr of superclusters ", 50, 0., 25.);
  histnrseeds_ = new TH1I("ns", "Nr of seeds if clusters", 50, 0., 25.);
}
 
void ElectronSeedAnalyzer::endJob() {
  histfile_->cd();
  tree_->Print();
  tree_->Write();
 
  // efficiency vs eta
  TH1F *histetaEff = (TH1F *)histetaMCmatched_->Clone("histetaEff");
  histetaEff->Reset();
  histetaEff->Divide(histetaMCmatched_, histeta_, 1, 1, "b");
  histetaEff->Print();
  histetaEff->GetXaxis()->SetTitle("#eta");
  histetaEff->GetYaxis()->SetTitle("Efficiency");
 
  // efficiency vs pt
  TH1F *histptEff = (TH1F *)histptMCmatched_->Clone("histotEff");
  histptEff->Reset();
  histptEff->Divide(histptMCmatched_, histpt_, 1, 1, "b");
  histptEff->Print();
  histptEff->GetXaxis()->SetTitle("p_{T}");
  histptEff->GetYaxis()->SetTitle("Efficiency");
 
  histeMCmatched_->Write();
  histecaldriveneMCmatched_->Write();
  histtrackerdriveneMCmatched_->Write();
  histeMC_->Write();
  histp_->Write();
  histeclu_->Write();
  histpt_->Write();
  histptMCmatched_->Write();
  histecaldrivenptMCmatched_->Write();
  histtrackerdrivenptMCmatched_->Write();
  histptMC_->Write();
  histetclu_->Write();
  histeffpt_->Write();
  histeta_->Write();
  histetaMCmatched_->Write();
  histecaldrivenetaMCmatched_->Write();
  histtrackerdrivenetaMCmatched_->Write();
  histetaMC_->Write();
  histetaclu_->Write();
  histeffeta_->Write();
  histq_->Write();
  histeoverp_->Write();
  histnbseeds_->Write();
  histnbclus_->Write();
  histnrseeds_->Write();
}
 
ElectronSeedAnalyzer::~ElectronSeedAnalyzer() {
  // do anything here that needs to be done at desctruction time
  // (e.g. close files, deallocate resources etc.)
  //tree_->Print();
  histfile_->Write();
  histeMC_->Write();
  histfile_->Close();
}
 
void ElectronSeedAnalyzer::analyze(const edm::Event &e, const edm::EventSetup &iSetup) {
  //Retrieve tracker topology from geometry
  edm::ESHandle<TrackerTopology> tTopo;
  iSetup.get<TrackerTopologyRcd>().get(tTopo);
 
  edm::ESHandle<TrackerGeometry> pDD;
  edm::ESHandle<MagneticField> theMagField;
  iSetup.get<TrackerDigiGeometryRecord>().get(pDD);
  iSetup.get<IdealMagneticFieldRecord>().get(theMagField);
 
  // rereads the seeds for test purposes
  typedef edm::OwnVector<TrackingRecHit> recHitContainer;
  typedef recHitContainer::const_iterator const_iterator;
  typedef std::pair<const_iterator, const_iterator> range;
 
  // get beam spot
  edm::Handle<reco::BeamSpot> theBeamSpot;
  e.getByLabel(beamSpot_, theBeamSpot);
 
  // get seeds
 
  edm::Handle<ElectronSeedCollection> elSeeds;
  e.getByLabel(inputCollection_, elSeeds);
  edm::LogInfo("") << "\n\n =================> Treating event " << e.id() << " Number of seeds "
                   << elSeeds.product()->size();
  int is = 0;
 
  float mass = .000511;  // electron propagation
  PropagatorWithMaterial *prop1stLayer = new PropagatorWithMaterial(oppositeToMomentum, mass, &(*theMagField));
  PropagatorWithMaterial *prop2ndLayer = new PropagatorWithMaterial(alongMomentum, mass, &(*theMagField));
 
  float dphi1 = 0., dphi2 = 0., drz1 = 0., drz2 = 0.;
  float phi1 = 0., phi2 = 0., rz1 = 0., rz2 = 0.;
 
  for (ElectronSeedCollection::const_iterator MyS = (*elSeeds).begin(); MyS != (*elSeeds).end(); ++MyS) {
    LogDebug("") << "\nSeed nr " << is << ": ";
    range r = (*MyS).recHits();
    LogDebug("") << " Number of RecHits= " << (*MyS).nHits();
    const GeomDet *det1 = nullptr;
    const GeomDet *det2 = nullptr;
 
    TrajectorySeed::const_iterator it = r.first;
    DetId id1 = (*it).geographicalId();
    det1 = pDD->idToDet(id1);
    LogDebug("") << " First hit local x,y,z " << (*it).localPosition() << " det " << id1.det() << " subdet "
                 << id1.subdetId();
    LogDebug("") << " First hit global  " << det1->toGlobal((*it).localPosition());
    //std::cout <<" First hit local x,y,z "<<(*it).localPosition()<<" det "<<id1.det()<<" subdet "<<id1.subdetId()<< std::endl;
    //std::cout <<" First hit global  "<<det1->toGlobal((*it).localPosition())<< std::endl;
    it++;
    DetId id2 = (*it).geographicalId();
    det2 = pDD->idToDet(id2);
    LogDebug("") << " Second hit local x,y,z " << (*it).localPosition() << " det " << id2.det() << " subdet "
                 << id2.subdetId();
    LogDebug("") << " Second hit global  " << det2->toGlobal((*it).localPosition());
    //std::cout <<" Second hit local x,y,z "<<(*it).localPosition()<<" det "<<id2.det()<<" subdet "<<id2.subdetId()<< std::endl;
    //std::cout <<" Second hit global  "<<det2->toGlobal((*it).localPosition()) << std::endl;
 
    // state on last det
    const GeomDet *det = nullptr;
    for (TrackingRecHitCollection::const_iterator rhits = r.first; rhits != r.second; rhits++)
      det = pDD->idToDet(((*rhits)).geographicalId());
    TrajectoryStateOnSurface t =
        trajectoryStateTransform::transientState((*MyS).startingState(), &(det->surface()), &(*theMagField));
 
    // debug
 
    LogDebug("") << " ElectronSeed outermost state position: " << t.globalPosition();
    LogDebug("") << " ElectronSeed outermost state momentum: " << t.globalMomentum();
    edm::RefToBase<CaloCluster> caloCluster = (*MyS).caloCluster();
    if (caloCluster.isNull())
      continue;
    edm::Ref<SuperClusterCollection> theClus = caloCluster.castTo<SuperClusterRef>();
    LogDebug("") << " ElectronSeed superCluster energy: " << theClus->energy() << ", position: " << theClus->position();
    LogDebug("") << " ElectronSeed outermost state Pt: " << t.globalMomentum().perp();
    LogDebug("") << " ElectronSeed supercluster Et: "
                 << theClus->energy() * sin(2. * atan(exp(-theClus->position().eta())));
    LogDebug("") << " ElectronSeed outermost momentum direction eta: " << t.globalMomentum().eta();
    LogDebug("") << " ElectronSeed supercluster eta: " << theClus->position().eta();
    LogDebug("") << " ElectronSeed seed charge: " << (*MyS).getCharge();
    LogDebug("") << " ElectronSeed E/p: " << theClus->energy() / t.globalMomentum().mag();
 
    // retreive SC and compute distances between hit position and prediction the same
    // way as in the PixelHitMatcher
 
    // inputs are charge, cluster position, vertex position, cluster energy and B field
    int charge = int((*MyS).getCharge());
    GlobalPoint xmeas(theClus->position().x(), theClus->position().y(), theClus->position().z());
    GlobalPoint vprim(theBeamSpot->position().x(), theBeamSpot->position().y(), theBeamSpot->position().z());
    float energy = theClus->energy();
 
    auto fts = trackingTools::ftsFromVertexToPoint(*theMagField, xmeas, vprim, energy, charge);
    //std::cout << "[PixelHitMatcher::compatibleSeeds] fts position, momentum " <<
    // fts.parameters().position() << " " << fts.parameters().momentum() << std::endl;
 
    PerpendicularBoundPlaneBuilder bpb;
    TrajectoryStateOnSurface tsos(fts, *bpb(fts.position(), fts.momentum()));
 
    //      TrajectorySeed::range r=(*seeds.product())[i].recHits();
    // TrajectorySeed::range r=(*seeds)[i].recHits();
 
    // first Hit
    it = r.first;
    DetId id = (*it).geographicalId();
    const GeomDet *geomdet = pDD->idToDet((*it).geographicalId());
    LocalPoint lp = (*it).localPosition();
    GlobalPoint hitPos = geomdet->surface().toGlobal(lp);
 
    TrajectoryStateOnSurface tsos1;
    tsos1 = prop1stLayer->propagate(tsos, geomdet->surface());
 
    if (tsos1.isValid()) {
      //UB add test on phidiff
      float SCl_phi = xmeas.phi();
      float localDphi = SCl_phi - hitPos.phi();
      if (localDphi > CLHEP::pi)
        localDphi -= (2 * CLHEP::pi);
      if (localDphi < -CLHEP::pi)
        localDphi += (2 * CLHEP::pi);
      if (std::abs(localDphi) > 2.5)
        continue;
 
      phi1 = hitPos.phi();
      dphi1 = hitPos.phi() - tsos1.globalPosition().phi();
      rz1 = hitPos.perp();
      drz1 = hitPos.perp() - tsos1.globalPosition().perp();
      if (id.subdetId() % 2 == 1) {
        drz1 = hitPos.z() - tsos1.globalPosition().z();
        rz1 = hitPos.z();
      }
 
      // now second Hit
      it++;
      DetId id2 = (*it).geographicalId();
      const GeomDet *geomdet2 = pDD->idToDet((*it).geographicalId());
      TrajectoryStateOnSurface tsos2;
 
      // compute the z vertex from the cluster point and the found pixel hit
      double pxHit1z = hitPos.z();
      double pxHit1x = hitPos.x();
      double pxHit1y = hitPos.y();
      double r1diff = (pxHit1x - vprim.x()) * (pxHit1x - vprim.x()) + (pxHit1y - vprim.y()) * (pxHit1y - vprim.y());
      r1diff = sqrt(r1diff);
      double r2diff = (xmeas.x() - pxHit1x) * (xmeas.x() - pxHit1x) + (xmeas.y() - pxHit1y) * (xmeas.y() - pxHit1y);
      r2diff = sqrt(r2diff);
      double zVertexPred = pxHit1z - r1diff * (xmeas.z() - pxHit1z) / r2diff;
 
      GlobalPoint vertexPred(vprim.x(), vprim.y(), zVertexPred);
 
      auto fts2 = trackingTools::ftsFromVertexToPoint(*theMagField, hitPos, vertexPred, energy, charge);
      tsos2 = prop2ndLayer->propagate(fts2, geomdet2->surface());
 
      if (tsos2.isValid()) {
        LocalPoint lp2 = (*it).localPosition();
        GlobalPoint hitPos2 = geomdet2->surface().toGlobal(lp2);
        phi2 = hitPos2.phi();
        dphi2 = hitPos2.phi() - tsos2.globalPosition().phi();
        rz2 = hitPos2.perp();
        drz2 = hitPos2.perp() - tsos2.globalPosition().perp();
        if (id2.subdetId() % 2 == 1) {
          rz2 = hitPos2.z();
          drz2 = hitPos2.z() - tsos2.globalPosition().z();
        }
      }
    }
 
    // fill the tree and histos
 
    histpt_->Fill(t.globalMomentum().perp());
    histetclu_->Fill(theClus->energy() * sin(2. * atan(exp(-theClus->position().eta()))));
    histeta_->Fill(t.globalMomentum().eta());
    histetaclu_->Fill(theClus->position().eta());
    histq_->Fill((*MyS).getCharge());
    histeoverp_->Fill(theClus->energy() / t.globalMomentum().mag());
 
    if (is < 10) {
      superclusterEnergy[is] = theClus->energy();
      superclusterEta[is] = theClus->position().eta();
      superclusterPhi[is] = theClus->position().phi();
      superclusterEt[is] = theClus->energy() * sin(2. * atan(exp(-theClus->position().eta())));
      seedMomentum[is] = t.globalMomentum().mag();
      seedEta[is] = t.globalMomentum().eta();
      seedPhi[is] = t.globalMomentum().phi();
      seedPt[is] = t.globalMomentum().perp();
      seedQ[is] = (*MyS).getCharge();
      seedSubdet1[is] = id1.subdetId();
      seedLayer1[is] = tTopo->layer(id1);
      seedSide1[is] = tTopo->side(id1);
      seedPhi1[is] = phi1;
      seedRz1[is] = rz1;
      seedDphi1[is] = dphi1;
      seedDrz1[is] = drz1;
      seedSubdet2[is] = id2.subdetId();
      seedLayer2[is] = tTopo->layer(id2);
      seedSide2[is] = tTopo->side(id2);
      seedDphi2[is] = dphi2;
      seedDrz2[is] = drz2;
      seedPhi2[is] = phi2;
      seedRz2[is] = rz2;
    }
 
    is++;
  }
 
  histnbseeds_->Fill(elSeeds.product()->size());
 
  // get input clusters
 
  edm::Handle<SuperClusterCollection> clusters;
  //CC to be changed according to supercluster input
  e.getByLabel("correctedHybridSuperClusters", clusters);
  histnbclus_->Fill(clusters.product()->size());
  if (!clusters.product()->empty())
    histnrseeds_->Fill(elSeeds.product()->size());
  // get MC information
 
  edm::Handle<edm::HepMCProduct> HepMCEvt;
  // this one is empty branch in current test files
  //e.getByLabel("generatorSmeared", "", HepMCEvt);
  //e.getByLabel("source", "", HepMCEvt);
  e.getByLabel("generatorSmeared", "", HepMCEvt);
 
  const HepMC::GenEvent *MCEvt = HepMCEvt->GetEvent();
  HepMC::GenParticle *genPc = nullptr;
  HepMC::FourVector pAssSim;
  int ip = 0;
  for (HepMC::GenEvent::particle_const_iterator partIter = MCEvt->particles_begin(); partIter != MCEvt->particles_end();
       ++partIter) {
    for (HepMC::GenEvent::vertex_const_iterator vertIter = MCEvt->vertices_begin(); vertIter != MCEvt->vertices_end();
         ++vertIter) {
      //      CLHEP::HepLorentzVector creation = (*partIter)->CreationVertex();
      HepMC::GenVertex *creation = (*partIter)->production_vertex();
      //      CLHEP::HepLorentzVector momentum = (*partIter)->Momentum();
      HepMC::FourVector momentum = (*partIter)->momentum();
      //      HepPDT::ParticleID id = (*partIter)->particleID();  // electrons and positrons are 11 and -11
      int id = (*partIter)->pdg_id();  // electrons and positrons are 11 and -11
      LogDebug("") << "MC particle id " << id << ", creationVertex " << (*creation) << " cm, initialMomentum "
                   << momentum.rho() << " GeV/c" << std::endl;
 
      if (id == 11 || id == -11) {
        // single primary electrons or electrons from Zs or Ws
        HepMC::GenParticle *mother = nullptr;
        if ((*partIter)->production_vertex()) {
          if ((*partIter)->production_vertex()->particles_begin(HepMC::parents) !=
              (*partIter)->production_vertex()->particles_end(HepMC::parents))
            mother = *((*partIter)->production_vertex()->particles_begin(HepMC::parents));
        }
        if (((mother == nullptr) || ((mother != nullptr) && (mother->pdg_id() == 23)) ||
             ((mother != nullptr) && (mother->pdg_id() == 32)) ||
             ((mother != nullptr) && (std::abs(mother->pdg_id()) == 24)))) {
          genPc = (*partIter);
          pAssSim = genPc->momentum();
 
          // EWK fiducial
          //if (pAssSim.perp()> 100. || std::abs(pAssSim.eta())> 2.5) continue;
          //if (pAssSim.perp()< 20. || (std::abs(pAssSim.eta())> 1.4442 && std::abs(pAssSim.eta())< 1.56) || std::abs(pAssSim.eta())> 2.5) continue;
          // reconstruction fiducial
          //if (pAssSim.perp()< 5. || std::abs(pAssSim.eta())> 2.5) continue;
          if (std::abs(pAssSim.eta()) > 2.5)
            continue;
 
          histptMC_->Fill(pAssSim.perp());
          histetaMC_->Fill(pAssSim.eta());
          histeMC_->Fill(pAssSim.rho());
 
          // looking for the best matching gsf electron
          bool okSeedFound = false;
          double seedOkRatio = 999999.;
 
          // find best matched seed
          reco::ElectronSeed bestElectronSeed;
          for (ElectronSeedCollection::const_iterator gsfIter = (*elSeeds).begin(); gsfIter != (*elSeeds).end();
               ++gsfIter) {
            range r = gsfIter->recHits();
            const GeomDet *det = nullptr;
            for (TrackingRecHitCollection::const_iterator rhits = r.first; rhits != r.second; rhits++)
              det = pDD->idToDet(((*rhits)).geographicalId());
            TrajectoryStateOnSurface t =
                trajectoryStateTransform::transientState(gsfIter->startingState(), &(det->surface()), &(*theMagField));
 
            float eta = t.globalMomentum().eta();
            float phi = t.globalMomentum().phi();
            float p = t.globalMomentum().mag();
            double dphi = phi - pAssSim.phi();
            if (std::abs(dphi) > CLHEP::pi)
              dphi = dphi < 0 ? (CLHEP::twopi) + dphi : dphi - CLHEP::twopi;
            double deltaR = sqrt(std::pow((eta - pAssSim.eta()), 2) + std::pow(dphi, 2));
            if (deltaR < 0.15) {
              //    if ( deltaR < 0.3 ){
              //if ( (genPc->pdg_id() == 11) && (gsfIter->charge() < 0.) || (genPc->pdg_id() == -11) &&
              //(gsfIter->charge() > 0.) ){
              double tmpSeedRatio = p / pAssSim.t();
              if (std::abs(tmpSeedRatio - 1) < std::abs(seedOkRatio - 1)) {
                seedOkRatio = tmpSeedRatio;
                bestElectronSeed = *gsfIter;
                okSeedFound = true;
              }
              //}
            }
          }  // loop over rec ele to look for the best one
 
          // analysis when the mc track is found
          if (okSeedFound) {
            histptMCmatched_->Fill(pAssSim.perp());
            histetaMCmatched_->Fill(pAssSim.eta());
            histeMCmatched_->Fill(pAssSim.rho());
            if (ip < 10) {
              mcEnergy[ip] = pAssSim.rho();
              mcEta[ip] = pAssSim.eta();
              mcPhi[ip] = pAssSim.phi();
              mcPt[ip] = pAssSim.perp();
              mcQ[ip] = ((id == 11) ? -1. : +1.);
            }
          }
 
          // efficiency for ecal driven only
          okSeedFound = false;
          seedOkRatio = 999999.;
 
          // find best matched seed
          for (ElectronSeedCollection::const_iterator gsfIter = (*elSeeds).begin(); gsfIter != (*elSeeds).end();
               ++gsfIter) {
            range r = gsfIter->recHits();
            const GeomDet *det = nullptr;
            for (TrackingRecHitCollection::const_iterator rhits = r.first; rhits != r.second; rhits++)
              det = pDD->idToDet(((*rhits)).geographicalId());
            TrajectoryStateOnSurface t =
                trajectoryStateTransform::transientState(gsfIter->startingState(), &(det->surface()), &(*theMagField));
 
            float eta = t.globalMomentum().eta();
            float phi = t.globalMomentum().phi();
            float p = t.globalMomentum().mag();
            double dphi = phi - pAssSim.phi();
            if (std::abs(dphi) > CLHEP::pi)
              dphi = dphi < 0 ? (CLHEP::twopi) + dphi : dphi - CLHEP::twopi;
            double deltaR = sqrt(std::pow((eta - pAssSim.eta()), 2) + std::pow(dphi, 2));
            if (gsfIter->isEcalDriven()) {
              if (deltaR < 0.15) {
                //  if ( deltaR < 0.3 ){
                //if ( (genPc->pdg_id() == 11) && (gsfIter->charge() < 0.) || (genPc->pdg_id() == -11) &&
                //(gsfIter->charge() > 0.) ){
                double tmpSeedRatio = p / pAssSim.t();
                if (std::abs(tmpSeedRatio - 1) < std::abs(seedOkRatio - 1)) {
                  seedOkRatio = tmpSeedRatio;
                  bestElectronSeed = *gsfIter;
                  okSeedFound = true;
                }
                //}
              }
            }  // end if ecal driven
          }    // loop over rec ele to look for the best one
 
          // analysis when the mc track is found
          if (okSeedFound) {
            histecaldrivenptMCmatched_->Fill(pAssSim.perp());
            histecaldrivenetaMCmatched_->Fill(pAssSim.eta());
            histecaldriveneMCmatched_->Fill(pAssSim.rho());
          }
 
          // efficiency for tracker driven only
          okSeedFound = false;
          seedOkRatio = 999999.;
 
          // find best matched seed
          for (ElectronSeedCollection::const_iterator gsfIter = (*elSeeds).begin(); gsfIter != (*elSeeds).end();
               ++gsfIter) {
            range r = gsfIter->recHits();
            const GeomDet *det = nullptr;
            for (TrackingRecHitCollection::const_iterator rhits = r.first; rhits != r.second; rhits++)
              det = pDD->idToDet(((*rhits)).geographicalId());
            TrajectoryStateOnSurface t =
                trajectoryStateTransform::transientState(gsfIter->startingState(), &(det->surface()), &(*theMagField));
 
            float eta = t.globalMomentum().eta();
            float phi = t.globalMomentum().phi();
            float p = t.globalMomentum().mag();
            double dphi = phi - pAssSim.phi();
            if (std::abs(dphi) > CLHEP::pi)
              dphi = dphi < 0 ? (CLHEP::twopi) + dphi : dphi - CLHEP::twopi;
            double deltaR = sqrt(std::pow((eta - pAssSim.eta()), 2) + std::pow(dphi, 2));
            if (gsfIter->isTrackerDriven()) {
              if (deltaR < 0.15) {
                //  if ( deltaR < 0.3 ){
                //if ( (genPc->pdg_id() == 11) && (gsfIter->charge() < 0.) || (genPc->pdg_id() == -11) &&
                //(gsfIter->charge() > 0.) ){
                double tmpSeedRatio = p / pAssSim.t();
                if (std::abs(tmpSeedRatio - 1) < std::abs(seedOkRatio - 1)) {
                  seedOkRatio = tmpSeedRatio;
                  bestElectronSeed = *gsfIter;
                  okSeedFound = true;
                }
                //}
              }
            }  // end if ecal driven
          }    // loop over rec ele to look for the best one
 
          // analysis when the mc track is found
          if (okSeedFound) {
            histtrackerdrivenptMCmatched_->Fill(pAssSim.perp());
            histtrackerdrivenetaMCmatched_->Fill(pAssSim.eta());
            histtrackerdriveneMCmatched_->Fill(pAssSim.rho());
          }
 
        }  // end if mother W or Z
 
      }  // end if gen part is electron
 
    }  // end loop on vertices
 
    ip++;
 
  }  // end loop on gen particles
 
  //tree_->Fill();
}