V0Validator.cc

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// -*- C++ -*-
//
// Package:    V0Validator
// Class:      V0Validator
// 
//
// Original Author:  Brian Drell
//         Created:  Wed Feb 18 17:21:04 MST 2009
//
//


#include "Validation/RecoVertex/interface/V0Validator.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"

typedef std::vector<TrackingVertex> TrackingVertexCollection;
typedef edm::Ref<TrackingVertexCollection> TrackingVertexRef;
typedef edm::RefVector<edm::HepMCProduct, HepMC::GenVertex > GenVertexRefVector;
typedef edm::RefVector<edm::HepMCProduct, HepMC::GenParticle > GenParticleRefVector;

V0Validator::V0Validator(const edm::ParameterSet& iConfig)
  : theDQMRootFileName(iConfig.getParameter<std::string>("DQMRootFileName"))
  , dirName(iConfig.getParameter<std::string>("dirName"))
  , recoRecoToSimCollectionToken_( consumes<reco::RecoToSimCollection>( edm::InputTag( std::string( "trackingParticleRecoTrackAsssociation" ) ) ) )
  , recoSimToRecoCollectionToken_( consumes<reco::SimToRecoCollection>( edm::InputTag( std::string( "trackingParticleRecoTrackAsssociation" ) ) ) )
  , trackingParticleCollection_Eff_Token_( consumes<TrackingParticleCollection>( edm::InputTag( std::string( "mix" )
                                                  , std::string( "MergedTrackTruth" )
                                                )
                                         )
                       )
  , trackingParticleCollectionToken_( consumes<TrackingParticleCollection>( edm::InputTag( std::string( "mix" )
                                             , std::string( "MergedTrackTruth" )
                                               )
                                        )
                      )
  , edmView_recoTrack_Token_( consumes< edm::View<reco::Track> >( edm::InputTag( std::string( "generalTracks" ) ) ) )
  , edmSimTrackContainerToken_( consumes<edm::SimTrackContainer>( edm::InputTag( std::string( "g4SimHits" ) ) ) )
  , edmSimVertexContainerToken_( consumes<edm::SimVertexContainer>( edm::InputTag( std::string( "g4SimHits" ) ) ) )
  , vec_recoVertex_Token_( consumes< std::vector<reco::Vertex> >( edm::InputTag( std::string( "offlinePrimaryVertices" ) ) ) )
  , recoVertexCompositeCandidateCollection_k0s_Token_( consumes<reco::VertexCompositeCandidateCollection>( iConfig.getParameter<edm::InputTag>( "kShortCollection" ) ) )
  , recoVertexCompositeCandidateCollection_lambda_Token_( consumes<reco::VertexCompositeCandidateCollection>( iConfig.getParameter<edm::InputTag>( "lambdaCollection" ) ) ) {

  genLam = genK0s = realLamFoundEff = realK0sFoundEff = lamCandFound = k0sCandFound = noTPforK0sCand = noTPforLamCand = realK0sFound = realLamFound = 0;
  
}

V0Validator::~V0Validator() {

}

void V0Validator::bookHistograms(DQMStore::IBooker & ibooker, edm::Run const &, edm::EventSetup const &) {
  ibooker.cd();
  std::string subDirName = V0Validator::dirName + "/EffFakes";
  ibooker.setCurrentFolder(subDirName.c_str());

  ksEffVsR = ibooker.book1D("K0sEffVsR", 
              "K^{0}_{S} Efficiency vs #rho", 40, 0., 40.);
  ksEffVsEta = ibooker.book1D("K0sEffVsEta",
                "K^{0}_{S} Efficiency vs #eta", 40, -2.5, 2.5);
  ksEffVsPt = ibooker.book1D("K0sEffVsPt",
               "K^{0}_{S} Efficiency vs p_{T}", 70, 0., 20.);;

  ksTkEffVsR = ibooker.book1D("K0sTkEffVsR", 
              "K^{0}_{S} Tracking Efficiency vs #rho", 40, 0., 40.);
  ksTkEffVsEta = ibooker.book1D("K0sTkEffVsEta",
                "K^{0}_{S} Tracking Efficiency vs #eta", 40, -2.5, 2.5);
  ksTkEffVsPt = ibooker.book1D("K0sTkEffVsPt",
               "K^{0}_{S} Tracking Efficiency vs p_{T}", 70, 0., 20.);

  ksEffVsR_num = ibooker.book1D("K0sEffVsR_num", 
              "K^{0}_{S} Efficiency vs #rho", 40, 0., 40.);
  ksEffVsEta_num = ibooker.book1D("K0sEffVsEta_num",
                "K^{0}_{S} Efficiency vs #eta", 40, -2.5, 2.5);
  ksEffVsPt_num = ibooker.book1D("K0sEffVsPt_num",
               "K^{0}_{S} Efficiency vs p_{T}", 70, 0., 20.);;

  ksTkEffVsR_num = ibooker.book1D("K0sTkEffVsR_num", 
              "K^{0}_{S} Tracking Efficiency vs #rho", 40, 0., 40.);
  ksTkEffVsEta_num = ibooker.book1D("K0sTkEffVsEta_num",
                "K^{0}_{S} Tracking Efficiency vs #eta", 40, -2.5, 2.5);
  ksTkEffVsPt_num = ibooker.book1D("K0sTkEffVsPt_num",
               "K^{0}_{S} Tracking Efficiency vs p_{T}", 70, 0., 20.);;

  ksEffVsR_denom = ibooker.book1D("K0sEffVsR_denom", 
              "K^{0}_{S} Efficiency vs #rho", 40, 0., 40.);
  ksEffVsEta_denom = ibooker.book1D("K0sEffVsEta_denom",
                "K^{0}_{S} Efficiency vs #eta", 40, -2.5, 2.5);
  ksEffVsPt_denom = ibooker.book1D("K0sEffVsPt_denom",
               "K^{0}_{S} Efficiency vs p_{T}", 70, 0., 20.);;

  lamEffVsR = ibooker.book1D("LamEffVsR",
               "#Lambda^{0} Efficiency vs #rho", 40, 0., 40.);
  lamEffVsEta = ibooker.book1D("LamEffVsEta",
                 "#Lambda^{0} Efficiency vs #eta", 40, -2.5, 2.5);
  lamEffVsPt = ibooker.book1D("LamEffVsPt",
                "#Lambda^{0} Efficiency vs p_{T}", 70, 0., 20.);

  lamTkEffVsR = ibooker.book1D("LamTkEffVsR",
               "#Lambda^{0} TrackingEfficiency vs #rho", 40, 0., 40.);
  lamTkEffVsEta = ibooker.book1D("LamTkEffVsEta",
                 "#Lambda^{0} Tracking Efficiency vs #eta", 40, -2.5, 2.5);
  lamTkEffVsPt = ibooker.book1D("LamTkEffVsPt",
                "#Lambda^{0} Tracking Efficiency vs p_{T}", 70, 0., 20.);

  lamEffVsR_num = ibooker.book1D("LamEffVsR_num",
               "#Lambda^{0} Efficiency vs #rho", 40, 0., 40.);
  lamEffVsEta_num = ibooker.book1D("LamEffVsEta_num",
                 "#Lambda^{0} Efficiency vs #eta", 40, -2.5, 2.5);
  lamEffVsPt_num = ibooker.book1D("LamEffVsPt_num",
                "#Lambda^{0} Efficiency vs p_{T}", 70, 0., 20.);

  lamTkEffVsR_num = ibooker.book1D("LamTkEffVsR_num",
               "#Lambda^{0} TrackingEfficiency vs #rho", 40, 0., 40.);
  lamTkEffVsEta_num = ibooker.book1D("LamTkEffVsEta_num",
                 "#Lambda^{0} Tracking Efficiency vs #eta", 40, -2.5, 2.5);
  lamTkEffVsPt_num = ibooker.book1D("LamTkEffVsPt_num",
                "#Lambda^{0} Tracking Efficiency vs p_{T}", 70, 0., 20.);

  lamEffVsR_denom = ibooker.book1D("LamEffVsR_denom",
               "#Lambda^{0} Efficiency vs #rho", 40, 0., 40.);
  lamEffVsEta_denom = ibooker.book1D("LamEffVsEta_denom",
                 "#Lambda^{0} Efficiency vs #eta", 40, -2.5, 2.5);
  lamEffVsPt_denom = ibooker.book1D("LamEffVsPt_denom",
                "#Lambda^{0} Efficiency vs p_{T}", 70, 0., 20.);

  ksFakeVsR = ibooker.book1D("K0sFakeVsR",
               "K^{0}_{S} Fake Rate vs #rho", 40, 0., 40.);
  ksFakeVsEta = ibooker.book1D("K0sFakeVsEta",
                 "K^{0}_{S} Fake Rate vs #eta", 40, -2.5, 2.5);
  ksFakeVsPt = ibooker.book1D("K0sFakeVsPt",
                "K^{0}_{S} Fake Rate vs p_{T}", 70, 0., 20.);
  ksTkFakeVsR = ibooker.book1D("K0sTkFakeVsR",
               "K^{0}_{S} Tracking Fake Rate vs #rho", 40, 0., 40.);
  ksTkFakeVsEta = ibooker.book1D("K0sTkFakeVsEta",
                 "K^{0}_{S} Tracking Fake Rate vs #eta", 40, -2.5, 2.5);
  ksTkFakeVsPt = ibooker.book1D("K0sTkFakeVsPt",
                "K^{0}_{S} Tracking Fake Rate vs p_{T}", 70, 0., 20.);

  ksFakeVsR_num = ibooker.book1D("K0sFakeVsR_num",
               "K^{0}_{S} Fake Rate vs #rho", 40, 0., 40.);
  ksFakeVsEta_num = ibooker.book1D("K0sFakeVsEta_num",
                 "K^{0}_{S} Fake Rate vs #eta", 40, -2.5, 2.5);
  ksFakeVsPt_num = ibooker.book1D("K0sFakeVsPt_num",
                "K^{0}_{S} Fake Rate vs p_{T}", 70, 0., 20.);
  ksTkFakeVsR_num = ibooker.book1D("K0sTkFakeVsR_num",
               "K^{0}_{S} Tracking Fake Rate vs #rho", 40, 0., 40.);
  ksTkFakeVsEta_num = ibooker.book1D("K0sTkFakeVsEta_num",
                 "K^{0}_{S} Tracking Fake Rate vs #eta", 40, -2.5, 2.5);
  ksTkFakeVsPt_num = ibooker.book1D("K0sTkFakeVsPt_num",
                "K^{0}_{S} Tracking Fake Rate vs p_{T}", 70, 0., 20.);

  ksFakeVsR_denom = ibooker.book1D("K0sFakeVsR_denom",
               "K^{0}_{S} Fake Rate vs #rho", 40, 0., 40.);
  ksFakeVsEta_denom = ibooker.book1D("K0sFakeVsEta_denom",
                 "K^{0}_{S} Fake Rate vs #eta", 40, -2.5, 2.5);
  ksFakeVsPt_denom = ibooker.book1D("K0sFakeVsPt_denom",
                "K^{0}_{S} Fake Rate vs p_{T}", 70, 0., 20.);

  lamFakeVsR = ibooker.book1D("LamFakeVsR",
                "#Lambda^{0} Fake Rate vs #rho", 40, 0., 40.);
  lamFakeVsEta = ibooker.book1D("LamFakeVsEta",
                  "#Lambda^{0} Fake Rate vs #eta", 40, -2.5, 2.5);
  lamFakeVsPt = ibooker.book1D("LamFakeVsPt",
                 "#Lambda^{0} Fake Rate vs p_{T}", 70, 0., 20.);
  lamTkFakeVsR = ibooker.book1D("LamTkFakeVsR",
                "#Lambda^{0} Tracking Fake Rate vs #rho", 40, 0., 40.);
  lamTkFakeVsEta = ibooker.book1D("LamTkFakeVsEta",
                  "#Lambda^{0} Tracking Fake Rate vs #eta", 40, -2.5, 2.5);
  lamTkFakeVsPt = ibooker.book1D("LamTkFakeVsPt",
                 "#Lambda^{0} Tracking Fake Rate vs p_{T}", 70, 0., 20.);

  lamFakeVsR_num = ibooker.book1D("LamFakeVsR_num",
                "#Lambda^{0} Fake Rate vs #rho", 40, 0., 40.);
  lamFakeVsEta_num = ibooker.book1D("LamFakeVsEta_num",
                  "#Lambda^{0} Fake Rate vs #eta", 40, -2.5, 2.5);
  lamFakeVsPt_num = ibooker.book1D("LamFakeVsPt_num",
                 "#Lambda^{0} Fake Rate vs p_{T}", 70, 0., 20.);
  lamTkFakeVsR_num = ibooker.book1D("LamTkFakeVsR_num",
                "#Lambda^{0} Tracking Fake Rate vs #rho", 40, 0., 40.);
  lamTkFakeVsEta_num = ibooker.book1D("LamTkFakeVsEta_num",
                  "#Lambda^{0} Tracking Fake Rate vs #eta", 40, -2.5, 2.5);
  lamTkFakeVsPt_num = ibooker.book1D("LamTkFakeVsPt_num",
                 "#Lambda^{0} Tracking Fake Rate vs p_{T}", 70, 0., 20.);

  lamFakeVsR_denom = ibooker.book1D("LamFakeVsR_denom",
                "#Lambda^{0} Fake Rate vs #rho", 40, 0., 40.);
  lamFakeVsEta_denom = ibooker.book1D("LamFakeVsEta_denom",
                  "#Lambda^{0} Fake Rate vs #eta", 40, -2.5, 2.5);
  lamFakeVsPt_denom = ibooker.book1D("LamFakeVsPt_denom",
                 "#Lambda^{0} Fake Rate vs p_{T}", 70, 0., 20.);

  ibooker.cd();
  subDirName = dirName + "/Other";
  ibooker.setCurrentFolder(subDirName.c_str());

  nKs = ibooker.book1D("nK0s",
             "Number of K^{0}_{S} found per event", 60, 0., 60.);
  nLam = ibooker.book1D("nLam",
              "Number of #Lambda^{0} found per event", 60, 0., 60.);

  ksXResolution = ibooker.book1D("ksXResolution",
                   "Resolution of V0 decay vertex X coordinate", 50, 0., 50.);
  ksYResolution = ibooker.book1D("ksYResolution",
                   "Resolution of V0 decay vertex Y coordinate", 50, 0., 50.);
  ksZResolution = ibooker.book1D("ksZResolution",
                   "Resolution of V0 decay vertex Z coordinate", 50, 0., 50.);
  lamXResolution = ibooker.book1D("lamXResolution",
                "Resolution of V0 decay vertex X coordinate", 50, 0., 50.);
  lamYResolution = ibooker.book1D("lamYResolution",
                "Resolution of V0 decay vertex Y coordinate", 50, 0., 50.);
  lamZResolution = ibooker.book1D("lamZResolution",
                "Resolution of V0 decay vertex Z coordinate", 50, 0., 50.);
  ksAbsoluteDistResolution = ibooker.book1D("ksRResolution",
                      "Resolution of absolute distance from primary vertex to V0 vertex",
                      100, 0., 50.);
  lamAbsoluteDistResolution = ibooker.book1D("lamRResolution",
                       "Resolution of absolute distance from primary vertex to V0 vertex",
                       100, 0., 50.);

  ksCandStatus = ibooker.book1D("ksCandStatus",
              "Fake type by cand status",
              10, 0., 10.);
  lamCandStatus = ibooker.book1D("ksCandStatus",
              "Fake type by cand status",
              10, 0., 10.);

  double minKsMass = 0.49767 - 0.07;
  double maxKsMass = 0.49767 + 0.07;
  double minLamMass = 1.1156 - 0.05;
  double maxLamMass = 1.1156 + 0.05;
  int ksMassNbins = 100;
  double ksMassXmin = minKsMass;
  double ksMassXmax = maxKsMass;
  int lamMassNbins = 100;
  double lamMassXmin = minLamMass;
  double lamMassXmax = maxLamMass;

  fakeKsMass = ibooker.book1D("ksMassFake",
                 "Mass of fake K0S",
                 ksMassNbins, minKsMass, maxKsMass);
  goodKsMass = ibooker.book1D("ksMassGood",
                 "Mass of good reco K0S",
                 ksMassNbins, minKsMass, maxKsMass);
  fakeLamMass = ibooker.book1D("lamMassFake",
                  "Mass of fake Lambda",
                  lamMassNbins, minLamMass, maxLamMass);
  goodLamMass = ibooker.book1D("lamMassGood",
                  "Mass of good Lambda",
                  lamMassNbins, minLamMass, maxLamMass);

  ksMassAll = ibooker.book1D("ksMassAll",
                  "Invariant mass of all K0S",
                  ksMassNbins, ksMassXmin, ksMassXmax);
  lamMassAll = ibooker.book1D("lamMassAll",
                   "Invariant mass of all #Lambda^{0}",
                   lamMassNbins, lamMassXmin, lamMassXmax);

  ksFakeDauRadDist = ibooker.book1D("radDistFakeKs",
                   "Production radius of daughter particle of Ks fake",
                   100, 0., 15.);
  lamFakeDauRadDist = ibooker.book1D("radDistFakeLam",
                    "Production radius of daughter particle of Lam fake",
                    100, 0., 15.);
}

void V0Validator::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup) {

  using std::cout;
  using std::endl;
  using namespace edm;
  using namespace std;

  // Get event setup info, B-field and tracker geometry
  ESHandle<MagneticField> bFieldHandle;
  iSetup.get<IdealMagneticFieldRecord>().get(bFieldHandle);
  ESHandle<GlobalTrackingGeometry> globTkGeomHandle;
  iSetup.get<GlobalTrackingGeometryRecord>().get(globTkGeomHandle);

  // Make matching collections
  Handle<reco::RecoToSimCollection > recotosimCollectionH;
  iEvent.getByToken( recoRecoToSimCollectionToken_, recotosimCollectionH );
  
  Handle<reco::SimToRecoCollection> simtorecoCollectionH;
  iEvent.getByToken( recoSimToRecoCollectionToken_, simtorecoCollectionH );

  edm::Handle<TrackingParticleCollection>  TPCollectionEff ;
  iEvent.getByToken( trackingParticleCollection_Eff_Token_, TPCollectionEff );
  const TrackingParticleCollection tPCeff = *( TPCollectionEff.product() );

  edm::ESHandle<TrackAssociatorBase> associatorByHits;
  iSetup.get<TrackAssociatorRecord>().get("TrackAssociatorByHits", associatorByHits);

  // Get tracks
  Handle< View<reco::Track> > trackCollectionH;
  iEvent.getByToken( edmView_recoTrack_Token_, trackCollectionH );

  Handle<SimTrackContainer> simTrackCollection;
  iEvent.getByToken( edmSimTrackContainerToken_, simTrackCollection );
  const SimTrackContainer simTC = *(simTrackCollection.product());

  Handle<SimVertexContainer> simVertexCollection;
  iEvent.getByToken( edmSimVertexContainerToken_, simVertexCollection );
  const SimVertexContainer simVC = *(simVertexCollection.product());

  //Get tracking particles
  //  -->tracks
  edm::Handle<TrackingParticleCollection>  TPCollectionH ;
  iEvent.getByToken( trackingParticleCollectionToken_, TPCollectionH );
  const View<reco::Track>  tC = *( trackCollectionH.product() );

  // Select the primary vertex, create a new reco::Vertex to hold it
  edm::Handle< std::vector<reco::Vertex> > primaryVtxCollectionH;
  iEvent.getByToken( vec_recoVertex_Token_, primaryVtxCollectionH );
  const reco::VertexCollection primaryVertexCollection   = *(primaryVtxCollectionH.product());

  reco::Vertex* thePrimary = 0;
  std::vector<reco::Vertex>::const_iterator iVtxPH = primaryVtxCollectionH->begin();
  for(std::vector<reco::Vertex>::const_iterator iVtx = primaryVtxCollectionH->begin();
      iVtx < primaryVtxCollectionH->end();
      iVtx++) {
    if(primaryVtxCollectionH->size() > 1) {
      if(iVtx->tracksSize() > iVtxPH->tracksSize()) {
    iVtxPH = iVtx;
      }
    }
    else iVtxPH = iVtx;
  }
  thePrimary = new reco::Vertex(*iVtxPH);

  //get the V0s;   
  edm::Handle<reco::VertexCompositeCandidateCollection> k0sCollection;
  edm::Handle<reco::VertexCompositeCandidateCollection> lambdaCollection;
  iEvent.getByToken( recoVertexCompositeCandidateCollection_k0s_Token_, k0sCollection );
  iEvent.getByToken( recoVertexCompositeCandidateCollection_lambda_Token_, lambdaCollection );

  //make vector of pair of trackingParticles to hold good V0 candidates
  std::vector< pair<TrackingParticleRef, TrackingParticleRef> > trueK0s;
  std::vector< pair<TrackingParticleRef, TrackingParticleRef> > trueLams;
  std::vector<double> trueKsMasses;
  std::vector<double> trueLamMasses;

  // Do fake rate calculation //

  // Kshorts
  double numK0sFound = 0.;
  double mass = 0.;
  std::vector<double> radDist;
  if ( k0sCollection->size() > 0 ) {
    vector<reco::TrackRef> theDaughterTracks;
    for( reco::VertexCompositeCandidateCollection::const_iterator iK0s = k0sCollection->begin();
     iK0s != k0sCollection->end();
     iK0s++) {
      // Fill mass of all K0S
      ksMassAll->Fill( iK0s->mass() );
      // Fill values to be histogrammed
      K0sCandpT = (sqrt( iK0s->momentum().perp2() ));
      K0sCandEta = iK0s->momentum().eta();
      K0sCandR = (sqrt( iK0s->vertex().perp2() ));
      K0sCandStatus = 0;
      mass = iK0s->mass();

      theDaughterTracks.push_back( (*(dynamic_cast<const reco::RecoChargedCandidate *> (iK0s->daughter(0)) )).track() );
      theDaughterTracks.push_back( (*(dynamic_cast<const reco::RecoChargedCandidate *> (iK0s->daughter(1)) )).track() );
       
      for (int itrack = 0; itrack < 2; itrack++) {
    K0sPiCandStatus[itrack] = 0;
      }

      std::vector< std::pair<TrackingParticleRef, double> > tp;
      TrackingParticleRef tpref;
      TrackingParticleRef firstDauTP;
      TrackingVertexRef k0sVtx;

      // Loop through K0s candidate daugher tracks
      for(View<reco::Track>::size_type i=0; i<theDaughterTracks.size(); ++i){
    // Found track from theDaughterTracks
    RefToBase<reco::Track> track( theDaughterTracks.at(i) );
        
    if(recotosimCollectionH->find(track) != recotosimCollectionH->end()) {
      tp = (*recotosimCollectionH)[track];
      if (tp.size() != 0) {
        K0sPiCandStatus[i] = 1;
        tpref = tp.begin()->first;

        if( simtorecoCollectionH->find(tpref) == simtorecoCollectionH->end() ) {
          K0sPiCandStatus[i] = 3;
        }
        TrackingVertexRef parentVertex = tpref->parentVertex();
        if(parentVertex.isNonnull()) radDist.push_back(parentVertex->position().R());
         
        if( parentVertex.isNonnull() ) {
          if( k0sVtx.isNonnull() ) {
        if( k0sVtx->position() == parentVertex->position() ) {
          if( parentVertex->nDaughterTracks() == 2 ) {
            if( parentVertex->nSourceTracks() == 0 ) {
              // No source tracks found for K0s vertex; shouldn't happen, but does for evtGen events
              K0sCandStatus = 6;
            }
            
            for( TrackingVertex::tp_iterator iTP = parentVertex->sourceTracks_begin();
             iTP != parentVertex->sourceTracks_end(); iTP++) {
              if( (*iTP)->pdgId() == 310 ) {
            K0sCandStatus = 1;
            realK0sFound++;
            numK0sFound += 1.;
            std::pair<TrackingParticleRef, TrackingParticleRef> pair(firstDauTP, tpref);
            // Pushing back a good V0
            trueK0s.push_back(pair);
            trueKsMasses.push_back(mass);
              }
              else {
            K0sCandStatus = 2;
            if( (*iTP)->pdgId() == 3122 ) {
              K0sCandStatus = 7;
            }
              }
            }
          }
          else {
            // Found a bad match because the mother has too many daughters
            K0sCandStatus = 3;
          }
        }
        else {
          // Found a bad match because the parent vertices from the two tracks are different
          K0sCandStatus = 4;
        }
          }
          else {
        // if k0sVtx is null, fill it with parentVertex to compare to the parentVertex from the second track
        k0sVtx = parentVertex;
        firstDauTP = tpref;
          }
        }//parent vertex is null
      }//tp size zero
    }
    else {
      K0sPiCandStatus[i] = 2;
      noTPforK0sCand++;
      K0sCandStatus = 5;
      theDaughterTracks.clear();
    }
      }
      theDaughterTracks.clear();
      // fill the fake rate histograms
      if( K0sCandStatus > 1 ) {
    ksFakeVsR_num->Fill(K0sCandR);
    ksFakeVsEta_num->Fill(K0sCandEta);
    ksFakeVsPt_num->Fill(K0sCandpT);
    ksCandStatus->Fill((float) K0sCandStatus);
    fakeKsMass->Fill(mass);
    for( unsigned int ndx = 0; ndx < radDist.size(); ndx++ ) {
      ksFakeDauRadDist->Fill(radDist[ndx]);
    }
      }
      if( K0sCandStatus == 5 ) {
    ksTkFakeVsR_num->Fill(K0sCandR);
    ksTkFakeVsEta_num->Fill(K0sCandEta);
    ksTkFakeVsPt_num->Fill(K0sCandpT);
      }
      ksFakeVsR_denom->Fill(K0sCandR);
      ksFakeVsEta_denom->Fill(K0sCandEta);
      ksFakeVsPt_denom->Fill(K0sCandpT);
    }
  }
  nKs->Fill( (float) numK0sFound );
  numK0sFound = 0.;

  double numLamFound = 0.;
  mass = 0.;
  radDist.clear();
  // Lambdas
  if ( lambdaCollection->size() > 0 ) {
    vector<reco::TrackRef> theDaughterTracks;
    for( reco::VertexCompositeCandidateCollection::const_iterator iLam = lambdaCollection->begin();
     iLam != lambdaCollection->end();
     iLam++) {
      // Fill mass plot with ALL lambdas
      lamMassAll->Fill( iLam->mass() );
      // Fill values to be histogrammed
      LamCandpT = (sqrt( iLam->momentum().perp2() ));
      LamCandEta = iLam->momentum().eta();
      LamCandR = (sqrt( iLam->vertex().perp2() ));
      LamCandStatus = 0;
      mass = iLam->mass();
      
      //cout << "Lam daughter tracks" << endl;
      theDaughterTracks.push_back( (*(dynamic_cast<const reco::RecoChargedCandidate *> (iLam->daughter(0)) )).track() );
      theDaughterTracks.push_back( (*(dynamic_cast<const reco::RecoChargedCandidate *> (iLam->daughter(1)) )).track() );
      
      for (int itrack = 0; itrack < 2; itrack++) {
    LamPiCandStatus[itrack] = 0;
      }
      
      std::vector< std::pair<TrackingParticleRef, double> > tp;
      TrackingParticleRef tpref;
      TrackingParticleRef firstDauTP;
      TrackingVertexRef LamVtx;
      // Loop through Lambda candidate daughter tracks
      for(View<reco::Track>::size_type i=0; i<theDaughterTracks.size(); ++i){
    // Found track from theDaughterTracks
    RefToBase<reco::Track> track( theDaughterTracks.at(i) );
    
    if(recotosimCollectionH->find(track) != recotosimCollectionH->end()) {
      tp = (*recotosimCollectionH)[track];
      if (tp.size() != 0) {
        LamPiCandStatus[i] = 1;
        tpref = tp.begin()->first;
        if( simtorecoCollectionH->find(tpref) == simtorecoCollectionH->end() ) {
          LamPiCandStatus[i] = 3;
        }
        TrackingVertexRef parentVertex = tpref->parentVertex();
        if( parentVertex.isNonnull() ) radDist.push_back(parentVertex->position().R());
         
        if( parentVertex.isNonnull() ) {
          if( LamVtx.isNonnull() ) {
        if( LamVtx->position() == parentVertex->position() ) {
          if( parentVertex->nDaughterTracks() == 2 ) {
            if( parentVertex->nSourceTracks() == 0 ) {
              // No source tracks found for K0s vertex; shouldn't happen, but does for evtGen events
              LamCandStatus = 6;
            }

            for( TrackingVertex::tp_iterator iTP = parentVertex->sourceTracks_begin();
             iTP != parentVertex->sourceTracks_end(); ++iTP) {
              if( abs((*iTP)->pdgId()) == 3122 ) {
            LamCandStatus = 1;
            realLamFound++;
            numLamFound += 1.;
            std::pair<TrackingParticleRef, TrackingParticleRef> pair(firstDauTP, tpref);
            // Pushing back a good V0
            trueLams.push_back(pair);
            trueLamMasses.push_back(mass);
              }
              else {
            LamCandStatus = 2;
            if( abs((*iTP)->pdgId() ) == 310 ) {
              LamCandStatus = 7;
            }
              }
            }
          }
          else {
            // Found a bad match because the mother has too many daughters
            LamCandStatus = 3;
          }
        }
        else {
          // Found a bad match because the parent vertices from the two tracks are different
          LamCandStatus = 4;
        }
          }
          else {
        // if lamVtx is null, fill it with parentVertex to compare to the parentVertex from the second track
        LamVtx = parentVertex;
        firstDauTP = tpref;
          }
        }//parent vertex is null
      }//tp size zero
    }
    else {
      LamPiCandStatus[i] = 2;
      noTPforLamCand++;
      LamCandStatus = 5;
      theDaughterTracks.clear();
    }
      }
      theDaughterTracks.clear();
      // fill the fake rate histograms
      if( LamCandStatus > 1 ) {
    lamFakeVsR_num->Fill(LamCandR);
    lamFakeVsEta_num->Fill(LamCandEta);
    lamFakeVsPt_num->Fill(LamCandpT);
    lamCandStatus->Fill((float) LamCandStatus);
    fakeLamMass->Fill(mass);
    for( unsigned int ndx = 0; ndx < radDist.size(); ndx++ ) {
      lamFakeDauRadDist->Fill(radDist[ndx]);
    }
      }
      if( K0sCandStatus == 5 ) {
    lamTkFakeVsR_num->Fill(LamCandR);
    lamTkFakeVsEta_num->Fill(LamCandEta);
    lamTkFakeVsPt_num->Fill(LamCandpT);
      }
      lamFakeVsR_denom->Fill(LamCandR);
      lamFakeVsEta_denom->Fill(LamCandEta);
      lamFakeVsPt_denom->Fill(LamCandpT);
    }
  }
  nLam->Fill( (double) numLamFound );
  numLamFound = 0.;


  // Do efficiency calculation //
  // Lambdas
  for(TrackingParticleCollection::size_type i = 0; i < tPCeff.size(); i++) {
    TrackingParticleRef tpr1(TPCollectionEff, i);
    const TrackingParticle* itp1 = tpr1.get();
    if( (itp1->pdgId() == 211 || itp1->pdgId() == 2212)
    && itp1->parentVertex().isNonnull()
    && abs(itp1->momentum().eta()) < 2.4
    && sqrt( itp1->momentum().perp2() ) > 0.9) {
      bool isLambda = false;
      if( itp1->pdgId() == 2212 ) isLambda = true;
      if( itp1->parentVertex()->nDaughterTracks() == 2 ) {

    TrackingVertexRef piCand1Vertex = itp1->parentVertex();
    for(TrackingVertex::tp_iterator iTP1 = piCand1Vertex->sourceTracks_begin();
        iTP1 != piCand1Vertex->sourceTracks_end(); iTP1++) {
      if( abs((*iTP1)->pdgId()) == 3122 ) {
        //       ----->>>>>>Keep going here
        for(TrackingParticleCollection::size_type j=0;
        j < tPCeff.size();
        j++) {
          TrackingParticleRef tpr2(TPCollectionEff, j);
          const TrackingParticle* itp2 = tpr2.get();
          int particle2pdgId;
          if (isLambda) particle2pdgId = -211;
          else particle2pdgId = -2212;
          if( itp2->pdgId() == particle2pdgId
          && itp2->parentVertex().isNonnull()
          && abs(itp2->momentum().eta()) < 2.4
          && sqrt(itp2->momentum().perp2()) > 0.9) {
        if(itp2->parentVertex() == itp1->parentVertex()) {
          // Found a good pair of Lambda daughters
          TrackingVertexRef piCand2Vertex = itp2->parentVertex();
          for (TrackingVertex::tp_iterator iTP2 = piCand2Vertex->sourceTracks_begin();
               iTP2 != piCand2Vertex->sourceTracks_end(); 
               ++iTP2) {
            LamGenEta = LamGenpT = LamGenR = 0.;
            LamGenStatus = 0;
            for(int ifill = 0;
            ifill < 2;
            ifill++) {
              // do nothing?
            }
            if( abs((*iTP2)->pdgId()) == 3122 ) {
              // found generated Lambda
              LamGenpT = sqrt((*iTP2)->momentum().perp2());
              LamGenEta = (*iTP2)->momentum().eta();
              LamGenR = sqrt(itp2->vertex().perp2());
              genLam++;
              if(trueLams.size() > 0) {
            int loop_1 = 0;
            for(std::vector< pair<TrackingParticleRef, TrackingParticleRef> >::const_iterator iEffCheck = trueLams.begin();
                iEffCheck != trueLams.end();
                iEffCheck++) {
              if( itp1->parentVertex() == iEffCheck->first->parentVertex()
                  && itp2->parentVertex() == iEffCheck->second->parentVertex() ) {
                realLamFoundEff++;
                //V0Producer found the generated Lambda
                LamGenStatus = 1;
                goodLamMass->Fill(trueLamMasses[loop_1]);
                break;
              }
              else {
                //V0Producer didn't find the generated Lambda
                LamGenStatus = 2;
              }
              loop_1++;
            }
              }
              else {
            //No V0 cand found, so V0Producer didn't find the generated Lambda
            LamGenStatus = 2;
              }
              std::vector< std::pair<RefToBase<reco::Track>, double> > rt1;
              std::vector< std::pair<RefToBase<reco::Track>, double> > rt2;
              
              if( simtorecoCollectionH->find(tpr1) != simtorecoCollectionH->end() ) {
            rt1 = (std::vector<std::pair<RefToBase<reco::Track>, double> >) (*simtorecoCollectionH)[tpr1];
            if(rt1.size() != 0) {
              LamPiEff[0] = 1; //Found the first daughter track
              edm::RefToBase<reco::Track> t1 = rt1.begin()->first;
            }
              }
              else {
            LamPiEff[0] = 2;//First daughter not found
              }
              if( (simtorecoCollectionH->find(tpr2) != simtorecoCollectionH->end()) ) {
            rt2 = (std::vector<std::pair<RefToBase<reco::Track>, double> >) (*simtorecoCollectionH)[tpr2];
            if(rt2.size() != 0) {
              LamPiEff[1] = 1;//Found the second daughter track
              edm::RefToBase<reco::Track> t2 = rt2.begin()->first;
            }
              }
              else {
            LamPiEff[1] = 2;//Second daughter not found
              }
              
              if( LamGenStatus == 1
              && (LamPiEff[0] == 2 || LamPiEff[1] == 2) ) {
            // Good Lambda found, but recoTrack->trackingParticle->recoTrack didn't work
            LamGenStatus = 4;
            realLamFoundEff--;
              }
              if( LamGenStatus == 2
              && (LamPiEff[0] == 2 || LamPiEff[1] == 2) ) {
            // Lambda not found because we didn't find a daughter track
            LamGenStatus = 3;
              }
              // Fill histograms
              if(LamGenR > 0.) {
            if(LamGenStatus == 1) {
              lamEffVsR_num->Fill(LamGenR);
            }
            if((double) LamGenStatus < 2.5) {
              lamTkEffVsR_num->Fill(LamGenR);
            }
            lamEffVsR_denom->Fill(LamGenR);
              }
              if(abs(LamGenEta) > 0.) {
            if(LamGenStatus == 1) {
              lamEffVsEta_num->Fill(LamGenEta);
            }
            if((double) LamGenStatus < 2.5) {
              lamTkEffVsEta_num->Fill(LamGenEta);
            }
            lamEffVsEta_denom->Fill(LamGenEta);
              }
              if(LamGenpT > 0.) {
            if(LamGenStatus == 1) {
              lamEffVsPt_num->Fill(LamGenpT);
            }
            if((double) LamGenStatus < 2.5) {
              lamTkEffVsPt_num->Fill(LamGenpT);
            }
            lamEffVsPt_denom->Fill(LamGenpT);
              }
            }
          }
        }
          }
        }
      }
    }
      }
    }
  }

  //Kshorts

  for (TrackingParticleCollection::size_type i=0; i<tPCeff.size(); i++){
    TrackingParticleRef tpr1(TPCollectionEff, i);
    const TrackingParticle* itp1 = tpr1.get();
    // only count the efficiency for pions with |eta|<2.4 and pT>0.9 GeV. First search for a suitable pi+
    if ( itp1->pdgId() == 211 
     && itp1->parentVertex().isNonnull() 
     && abs(itp1->momentum().eta()) < 2.4 
     && sqrt(itp1->momentum().perp2()) > 0.9) {
      if ( itp1->parentVertex()->nDaughterTracks() == 2 ) {
    TrackingVertexRef piCand1Vertex = itp1->parentVertex();        
    //check trackingParticle pion for a Ks mother
    for (TrackingVertex::tp_iterator iTP1 = piCand1Vertex->sourceTracks_begin();
         iTP1 != piCand1Vertex->sourceTracks_end(); ++iTP1) {
      //iTP1 is a TrackingParticle
      if ( (*iTP1)->pdgId()==310 ) {
        //with a Ks mother found for the pi+, loop through trackingParticles again to find a pi-
        for (TrackingParticleCollection::size_type j=0; j<tPCeff.size(); j++){
          TrackingParticleRef tpr2(TPCollectionEff, j);
          const TrackingParticle* itp2 = tpr2.get();
          
          if ( itp2->pdgId() == -211 && itp2->parentVertex().isNonnull()  
           && abs(itp2->momentum().eta()) < 2.4 
           && sqrt(itp2->momentum().perp2()) > 0.9) {
        //check the pi+ and pi- have the same vertex
        if ( itp2->parentVertex() == itp1->parentVertex() ) {
          TrackingVertexRef piCand2Vertex = itp2->parentVertex();          
          for (TrackingVertex::tp_iterator iTP2 = piCand2Vertex->sourceTracks_begin();
               iTP2 != piCand2Vertex->sourceTracks_end(); ++iTP2) {
            //iTP2 is a TrackingParticle
            K0sGenEta = K0sGenpT = K0sGenR = 0.;
            K0sGenStatus = 0;
            if( (*iTP2)->pdgId() == 310 ) {
              K0sGenpT = sqrt( (*iTP2)->momentum().perp2() );
              K0sGenEta = (*iTP2)->momentum().eta();
              K0sGenR = sqrt(itp2->vertex().perp2());
              genK0s++;
              int loop_2 = 0;
              if( trueK0s.size() > 0 ) {
            for( std::vector< pair<TrackingParticleRef, TrackingParticleRef> >::const_iterator iEffCheck = trueK0s.begin();
                 iEffCheck != trueK0s.end();
                 iEffCheck++) {
              //if the parent vertices for the tracks are the same, then the generated Ks was found
              if (itp1->parentVertex()==iEffCheck->first->parentVertex() &&
                  itp2->parentVertex()==iEffCheck->second->parentVertex())  {
                realK0sFoundEff++;
                K0sGenStatus = 1;
                goodKsMass->Fill(trueKsMasses[loop_2]);
                break;
              }
              else {
                K0sGenStatus = 2;
              }
            }
              }
              else {
            K0sGenStatus = 2;
              }

              // Check if the generated Ks tracks were found or not
              // by searching the recoTracks list for a match to the trackingParticles

              std::vector<std::pair<RefToBase<reco::Track>, double> > rt1;
              std::vector<std::pair<RefToBase<reco::Track>, double> > rt2;
              
              if( simtorecoCollectionH->find(tpr1) != simtorecoCollectionH->end() ) {
            rt1 = (std::vector< std::pair<RefToBase<reco::Track>, double> >) (*simtorecoCollectionH)[tpr1];
            if(rt1.size() != 0) {
              //First pion found
              K0sPiEff[0] = 1;
              edm::RefToBase<reco::Track> t1 = rt1.begin()->first;
            }
              }
              else {
            //First pion not found
            K0sPiEff[0] = 2;
              }
              
              if( simtorecoCollectionH->find(tpr2) != simtorecoCollectionH->end() ) {
            rt2 = (std::vector< std::pair<RefToBase<reco::Track>, double> >) (*simtorecoCollectionH)[tpr2];
            if(rt2.size() != 0) {
              //Second pion found
              K0sPiEff[1] = 1;
              edm::RefToBase<reco::Track> t2 = rt2.begin()->first;
            }
              }
              else {
            K0sPiEff[1] = 2;
              }
              if(K0sGenStatus == 1
             && (K0sPiEff[0] == 2 || K0sPiEff[1] == 2)) {
            K0sGenStatus = 4;
            realK0sFoundEff--;
              }
              if(K0sGenStatus == 2
             && (K0sPiEff[0] == 2 || K0sPiEff[1] == 2)) {
            K0sGenStatus = 3;
              }
              if(K0sPiEff[0] == 1 && K0sPiEff[1] == 1) {
            k0sTracksFound++;
              }
              //Fill Histograms
              if(K0sGenR > 0.) {
            if(K0sGenStatus == 1) {
              ksEffVsR_num->Fill(K0sGenR);
            }
            if((double) K0sGenStatus < 2.5) {             
              ksTkEffVsR_num->Fill(K0sGenR);
            }
            ksEffVsR_denom->Fill(K0sGenR);
              }
              if(abs(K0sGenEta) > 0.) {
            if(K0sGenStatus == 1) {
              ksEffVsEta_num->Fill(K0sGenEta);
            }
            if((double) K0sGenStatus < 2.5) {
              ksTkEffVsEta_num->Fill(K0sGenEta);
            }
            ksEffVsEta_denom->Fill(K0sGenEta);
              }
              if(K0sGenpT > 0.) {
            if(K0sGenStatus == 1) {
              ksEffVsPt_num->Fill(K0sGenpT);
            }
            if((double) K0sGenStatus < 2.5) {
              ksTkEffVsPt_num->Fill(K0sGenpT);
            }
            ksEffVsPt_denom->Fill(K0sGenpT);
              }
            }
          }
        }
          }
        }
      }
    }
      }
    }
  }

  delete thePrimary;
}

//define this as a plug-in
//DEFINE_FWK_MODULE(V0Validator);