PVStudy/plugins/PVStudy.cc

// -*- C++ -*-
//
// Package:    PVStudy
// Class:      PVStudy
// 
/**\class PVStudy PVStudy.cc UserCode/PVStudy/plugins/PVStudy.cc

Description: <one line class summary>

Implementation:
<Notes on implementation>
*/
//
// Original Author:  "Geng-yuan Jeng/UC Riverside"
//                   "Yanyan Gao/Fermilab ygao@fnal.gov"
//         Created:  Thu Aug 20 11:55:40 CDT 2009
// $Id: PVStudy.cc,v 1.13 2009/12/04 08:37:40 jengbou Exp $
//
//


// system include files
#include <memory>
#include <string>
#include <vector>
#include <iostream>
#include <sstream>
#include <algorithm>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "PhysicsTools/UtilAlgos/interface/TFileService.h"
#include "UserCode/PVStudy/interface/PVStudy.h"
//
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"

// simulated vertices,..., add <use name=SimDataFormats/Vertex> and <../Track>
#include <SimDataFormats/Vertex/interface/SimVertex.h>
#include <SimDataFormats/Vertex/interface/SimVertexContainer.h>
#include <SimDataFormats/Track/interface/SimTrack.h>
#include <SimDataFormats/Track/interface/SimTrackContainer.h>

//root
#include <TROOT.h>
#include <TF1.h>
#include <TString.h>
#include <TStyle.h>
#include <TPaveStats.h>
#include <TPad.h>

using namespace std;

PVStudy::PVStudy(const edm::ParameterSet& iConfig)
{
  //=======================================================================
  // Get configuration for TrackTupleMaker
  //=======================================================================
  simG4_                     = iConfig.getParameter<edm::InputTag>( "simG4" );
  trackCollectionTag_        = iConfig.getUntrackedParameter<edm::InputTag>("trackCollection");  
  splitTrackCollection1Tag_  = iConfig.getUntrackedParameter<edm::InputTag>("splitTrackCollection1");
  splitTrackCollection2Tag_  = iConfig.getUntrackedParameter<edm::InputTag>("splitTrackCollection2");
  vertexCollectionTag_       = iConfig.getUntrackedParameter<edm::InputTag>("vertexCollection");
  splitVertexCollection1Tag_ = iConfig.getUntrackedParameter<edm::InputTag>("splitVertexCollection1");
  splitVertexCollection2Tag_ = iConfig.getUntrackedParameter<edm::InputTag>("splitVertexCollection2");  
  pixelVertexCollectionTag_  = iConfig.getParameter<edm::InputTag>("pixelVertexCollectionTag");  
  verbose_                   = iConfig.getUntrackedParameter<bool>("verbose",false);
  realData_                  = iConfig.getUntrackedParameter<bool>("realData",false);
  analyze_                   = iConfig.getUntrackedParameter<bool>("analyzeOnTheFly",false);
  saventuple_                = iConfig.getUntrackedParameter<bool>("saventuple",false);  
  outputfilename_            = iConfig.getUntrackedParameter<string>("OutputFileName"); 
  ntrkdiffcut_               = iConfig.getUntrackedParameter<double>("ntrkdiffcut");
  zsigncut_                  = iConfig.getUntrackedParameter<int>("zsigncut");
  nTrkMin_                   = iConfig.getUntrackedParameter<int>("nTrkMin");
  nTrkMax_                   = iConfig.getUntrackedParameter<int>("nTrkMax");
  histoFileName_             = iConfig.getUntrackedParameter<std::string> ("histoFileName");

  //now do what ever initialization is needed
  pvinfo.clear();

  
  // Specify the data mode vector
  if(realData_) datamode.push_back(0);
  else {
    datamode.push_back(0);
    datamode.push_back(1);
    datamode.push_back(2);
    datamode.push_back(3);
  }

  // Create ntuple files if needed
  if(saventuple_) {
    file_ = TFile::Open(outputfilename_.c_str(),"RECREATE");
    ftree_ = new TTree("mytree","mytree");
    ftree_->AutoSave();
    ftree_->Branch("residual",&fres_,"fres_[3]/D");
    ftree_->Branch("error",&ferror_,"ferror_[3]/D");
    ftree_->Branch("nTrkPV",&fntrk_,"fntrk_/I");

    // pvtxtree_ analyzing the pvtxs ootb
    pvtxtree_ = new TTree("pvtxtree","pvtxtree");
    //pvtx using all tracks
    pvtxtree_->Branch("nrecPV",&nrecPV_,"nrecPV/I");
    pvtxtree_->Branch("nTrkPV",&nTrkPV_,"nTrkPV[nrecPV]/I");
    pvtxtree_->Branch("sumptsq",&sumptsq_,"sumptsq[nrecPV]/D");    
    pvtxtree_->Branch("isValid",&isValid_,"isValid/I");
    pvtxtree_->Branch("isFake",&isFake_,"isFake/I");
    pvtxtree_->Branch("recx",&recx_,"recx[nrecPV]/D");
    pvtxtree_->Branch("recy",&recy_,"recy[nrecPV]/D");
    pvtxtree_->Branch("recz",&recz_,"recz[nrecPV]/D");
    pvtxtree_->Branch("recx_err",&recx_err_,"recx_err[nrecPV]/D");
    pvtxtree_->Branch("recy_err",&recy_err_,"recy_err[nrecPV]/D");
    pvtxtree_->Branch("recz_err",&recz_err_,"recz_err[nrecPV]/D");

    pvtxtree_->Branch("min_zsep",&min_zsep_,"min_zsep/D");
    pvtxtree_->Branch("min_ntrksep",&min_ntrksep_,"min_ntrksep/D");
    pvtxtree_->Branch("min_sumpt2sep",&min_sumpt2sep_,"min_sumpt2sep/D");

    //pvtx using splittracks1
    pvtxtree_->Branch("nrecPV1_spl",&nrecPV1_spl_,"nrecPV1_spl/I");
    pvtxtree_->Branch("nTrkPV1_spl",&nTrkPV1_spl_,"nTrkPV1_spl[nrecPV1_spl]/I");  
    pvtxtree_->Branch("sumptsq1_spl",&sumptsq1_spl_,"sumptsq1_spl[nrecPV1_spl]/D");  
    pvtxtree_->Branch("isValid1_spl",&isValid1_spl_,"isValid1_spl/I");
    pvtxtree_->Branch("isFake1_spl",&isFake1_spl_,"isFake1_spl/I");
    pvtxtree_->Branch("recx1_spl",&recx1_spl_,"recx1_spl[nrecPV1_spl]/D");
    pvtxtree_->Branch("recy1_spl",&recy1_spl_,"recy1_spl[nrecPV1_spl]/D");
    pvtxtree_->Branch("recz1_spl",&recz1_spl_,"recz1_spl[nrecPV1_spl]/D");
    pvtxtree_->Branch("recx1_err_spl",&recx1_err_spl_,"recx1_err_spl[nrecPV1_spl]/D");
    pvtxtree_->Branch("recy1_err_spl",&recy1_err_spl_,"recy1_err_spl[nrecPV1_spl]/D");
    pvtxtree_->Branch("recz1_err_spl",&recz1_err_spl_,"recz1_err_spl[nrecPV1_spl]/D");  
  
    //pvtx using splittracks2
    pvtxtree_->Branch("nrecPV2_spl",&nrecPV2_spl_,"nrecPV2_spl/I");
    pvtxtree_->Branch("nTrkPV2_spl",&nTrkPV2_spl_,"nTrkPV2_spl[nrecPV2_spl]/I");    
    pvtxtree_->Branch("sumptsq2_spl",&sumptsq2_spl_,"sumptsq2_spl[nrecPV2_spl]/D");  
    pvtxtree_->Branch("isValid2_spl",&isValid2_spl_,"isValid2_spl/I");
    pvtxtree_->Branch("isFake2_spl",&isFake2_spl_,"isFake2_spl/I");
    pvtxtree_->Branch("recx2_spl",&recx2_spl_,"recx2_spl[nrecPV2_spl]/D");
    pvtxtree_->Branch("recy2_spl",&recy2_spl_,"recy2_spl[nrecPV2_spl]/D");
    pvtxtree_->Branch("recz2_spl",&recz2_spl_,"recz2_spl[nrecPV2_spl]/D");
    pvtxtree_->Branch("recx2_err_spl",&recx2_err_spl_,"recx2_err_spl[nrecPV2_spl]/D");
    pvtxtree_->Branch("recy2_err_spl",&recy2_err_spl_,"recy2_err_spl[nrecPV2_spl]/D");
    pvtxtree_->Branch("recz2_err_spl",&recz2_err_spl_,"recz2_err_spl[nrecPV2_spl]/D");  
    
    //pixeVertices
    pvtxtree_->Branch("nrecPV_pxlpvtx",&nrecPV_pxlpvtx_,"nrecPV_pxlpvtx/I");
    pvtxtree_->Branch("nTrkPV_pxlpvtx",&nTrkPV_pxlpvtx_,"nTrkPV_pxlpvtx[nrecPV_pxlpvtx]/I");    
    pvtxtree_->Branch("sumptsq_pxlpvtx",&sumptsq_pxlpvtx_,"sumptsq_pxlpvtx[nrecPV_pxlpvtx]/D");  
    pvtxtree_->Branch("isValid_pxlpvtx",&isValid_pxlpvtx_,"isValid_pxlpvtx/I");
    pvtxtree_->Branch("isFake_pxlpvtx",&isFake_pxlpvtx_,"isFake_pxlpvtx/I");
    pvtxtree_->Branch("recx_pxlpvtx",&recx_pxlpvtx_,"recx_pxlpvtx[nrecPV_pxlpvtx]/D");
    pvtxtree_->Branch("recy_pxlpvtx",&recy_pxlpvtx_,"recy_pxlpvtx[nrecPV_pxlpvtx]/D");
    pvtxtree_->Branch("recz_pxlpvtx",&recz_pxlpvtx_,"recz_pxlpvtx[nrecPV_pxlpvtx]/D");
    pvtxtree_->Branch("recx_err_pxlpvtx",&recx_err_pxlpvtx_,"recx_err_pxlpvtx[nrecPV_pxlpvtx]/D");
    pvtxtree_->Branch("recy_err_pxlpvtx",&recy_err_pxlpvtx_,"recy_err_pxlpvtx[nrecPV_pxlpvtx]/D");
    pvtxtree_->Branch("recz_err_pxlpvtx",&recz_err_pxlpvtx_,"recz_err_pxlpvtx[nrecPV_pxlpvtx]/D");  

    //Fill the variables in the twovtx pair (recvtx1, recvtx2) 
    pvtxtree_->Branch("nrecPV_twovtx",&nrecPV_twovtx_,"nrecPV_twovtx/I");
    pvtxtree_->Branch("nTrkPV1_spl_twovtx",&nTrkPV1_spl_twovtx_,"nTrkPV1_spl_twovtx[nrecPV_twovtx]/I");
    pvtxtree_->Branch("nTrkPV2_spl_twovtx",&nTrkPV2_spl_twovtx_,"nTrkPV2_spl_twovtx[nrecPV_twovtx]/I");
    pvtxtree_->Branch("sumptsq1_spl_twovtx",&sumptsq1_spl_twovtx_,"sumptsq1_spl_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("sumptsq2_spl_twovtx",&sumptsq2_spl_twovtx_,"sumptsq2_spl_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("nTrkPV_twovtx",&nTrkPV_twovtx_,"nTrkPV_twovtx[nrecPV_twovtx]/I");
    pvtxtree_->Branch("deltax_twovtx",&deltax_twovtx_,"deltax_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("deltay_twovtx",&deltay_twovtx_,"deltay_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("deltaz_twovtx",&deltaz_twovtx_,"deltaz_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("errx_twovtx",&errx_twovtx_,"errx_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("erry_twovtx",&erry_twovtx_,"erry_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("errz_twovtx",&errz_twovtx_,"errz_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("pullx_twovtx",&pullx_twovtx_,"pullx_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("pully_twovtx",&pully_twovtx_,"pully_twovtx[nrecPV_twovtx]/D");
    pvtxtree_->Branch("pullz_twovtx",&pullz_twovtx_,"pullz_twovtx[nrecPV_twovtx]/D");
    
    // MC variables
    if(!realData_) {  
      pvtxtree_->Branch("nsimPV",&nsimPV_,"nsimPV/I");
      pvtxtree_->Branch("nsimTrkPV",&nsimTrkPV_,"nsimTrkPV[nsimPV]/I");
      pvtxtree_->Branch("simx",&simx_,"simx[nsimPV]/D");
      pvtxtree_->Branch("simy",&simy_,"simy[nsimPV]/D");
      pvtxtree_->Branch("simz",&simz_,"simz[nsimPV]/D");
      pvtxtree_->Branch("simptsq",&simptsq_,"simptsq[nsimPV]/D");

      // For pvtxs with all the tracks 
      pvtxtree_->Branch("nrecPV_mct",&nrecPV_mct_,"nrecPV_mct/I");
      pvtxtree_->Branch("deltax_mct",&deltax_mct_,"deltax_mct[nrecPV_mct]/D");
      pvtxtree_->Branch("deltay_mct",&deltay_mct_,"deltay_mct[nrecPV_mct]/D");
      pvtxtree_->Branch("deltaz_mct",&deltaz_mct_,"deltaz_mct[nrecPV_mct]/D");
      pvtxtree_->Branch("pullx_mct",&pullx_mct_,"pullx_mct[nrecPV_mct]/D");
      pvtxtree_->Branch("pully_mct",&pully_mct_,"pully_mct[nrecPV_mct]/D");
      pvtxtree_->Branch("pullz_mct",&pullz_mct_,"pullz_mct[nrecPV_mct]/D");
      // For pvtxs with splittracks1
      pvtxtree_->Branch("nrecPV_spl1_mct",&nrecPV_spl1_mct_,"nrecPV_spl1_mct/I");
      pvtxtree_->Branch("deltax_spl1_mct",&deltax_spl1_mct_,"deltax_spl1_mct[nrecPV_spl1_mct]/D");
      pvtxtree_->Branch("deltay_spl1_mct",&deltay_spl1_mct_,"deltay_spl1_mct[nrecPV_spl1_mct]/D");
      pvtxtree_->Branch("deltaz_spl1_mct",&deltaz_spl1_mct_,"deltaz_spl1_mct[nrecPV_spl1_mct]/D");
      pvtxtree_->Branch("pullx_spl1_mct",&pullx_spl1_mct_,"pullx_spl1_mct[nrecPV_spl1_mct]/D");
      pvtxtree_->Branch("pully_spl1_mct",&pully_spl1_mct_,"pully_spl1_mct[nrecPV_spl1_mct]/D");
      pvtxtree_->Branch("pullz_spl1_mct",&pullz_spl1_mct_,"pullz_spl1_mct[nrecPV_spl1_mct]/D");
      // For pvtxs with splittracks1
      pvtxtree_->Branch("nrecPV_spl2_mct",&nrecPV_spl2_mct_,"nrecPV_spl2_mct/I");
      pvtxtree_->Branch("deltax_spl2_mct",&deltax_spl2_mct_,"deltax_spl2_mct[nrecPV_spl2_mct]/D");
      pvtxtree_->Branch("deltay_spl2_mct",&deltay_spl2_mct_,"deltay_spl2_mct[nrecPV_spl2_mct]/D");
      pvtxtree_->Branch("deltaz_spl2_mct",&deltaz_spl2_mct_,"deltaz_spl2_mct[nrecPV_spl2_mct]/D");
      pvtxtree_->Branch("pullx_spl2_mct",&pullx_spl2_mct_,"pullx_spl2_mct[nrecPV_spl2_mct]/D");
      pvtxtree_->Branch("pully_spl2_mct",&pully_spl2_mct_,"pully_spl2_mct[nrecPV_spl2_mct]/D");
      pvtxtree_->Branch("pullz_spl2_mct",&pullz_spl2_mct_,"pullz_spl2_mct[nrecPV_spl2_mct]/D");
    }
  }

  setRootStyle();

  // Create a root file for histograms
  theFile = new TFile(histoFileName_.c_str(), "RECREATE");
  // make diretories
  theFile->mkdir("Summary");
  theFile->cd();
  theFile->mkdir("Others");
  theFile->cd();

  // Book Histograms:
  h_pvtrk   = new PVHistograms();
  h_pixvtx  = new PVHistograms();
  h_misc    = new PVHistograms();
  h_summary = new PVHistograms();
  h_others  = new PVHistograms();

  for(int i=0;i<3;i++) {  
    if(i == 0) h_pvtrk->Init("pvTrk");
    else {
      stringstream ss;
      ss << i;
      h_pvtrk->Init("pvTrk",ss.str(),"spl");
    }
  }
  h_pixvtx->Init("pixVtx");
  h_misc->Init("misc");

  // Book MC only plots
  if (!realData_) {
    h_gen = new PVHistograms();
    h_gen->Init("generator");
  }
  if (analyze_) h_ana = new PVHistograms();

  //Book histograms sensitive to data/mc
  for (vector<int>::const_iterator it= datamode.begin(); it != datamode.end() ; ++it) {
    string suffix; 
    edm::LogInfo("Debug")<<"datamode = "<< *it<<endl;
    switch(*it) {
    case 0: suffix = "";
      break;
    case 1: suffix = "_spl1_mct";
      break;
    case 2: suffix = "_spl2_mct";       
      break;
    case 3: suffix = "_mct";
      break;
    }
    h_summary->Init("summary",suffix);
    
    // Book residual, error and pull histograms for each nTrk bin
    for (int ntrk=nTrkMin_;ntrk<=nTrkMax_;++ntrk) {
      stringstream ss;
      ss << ntrk;
      h_others->Init("others",suffix,ss.str());
    }

    // Book residual and pull histograms only when analyzeOntheFly is enabled
    if(analyze_) h_ana->InitA("analysis",suffix,"nTrk",nTrkMin_,nTrkMax_);
    suffix.clear();
  } // End of Book histograms sensitive to data/mc    

}

PVStudy::~PVStudy()
{
  theFile->cd();
  theFile->cd("Summary");
  h_pvtrk->Save();
  h_pixvtx->Save();
  h_gen->Save();
  h_misc->Save();
  h_summary->Save();
  if (analyze_)
    h_ana->Save();
  theFile->cd();
  theFile->cd("Others");
  h_others->Save();

  theFile->Close();
}

void PVStudy::setRootStyle() {
  //
  gROOT->SetStyle("Plain");
  gStyle->SetFillColor(1);
  gStyle->SetOptDate();
  //   gStyle->SetOptStat(1111110); 
  //   gStyle->SetOptFit(0111);
  //   gStyle->SetPadTickX(1);
  //   gStyle->SetPadTickY(1);
  gStyle->SetMarkerSize(0.5);
  gStyle->SetMarkerStyle(8);
  gStyle->SetGridStyle(3);
  //gStyle->SetPadGridX(1);
  //gStyle->SetPadGridY(1);
  gStyle->SetPaperSize(TStyle::kA4);
  gStyle->SetStatW(0.25);             // width of statistics box; default is 0.19
  //   gStyle->SetStatH(0.10);             // height of statistics box; default is 0.1
  gStyle->SetStatFormat("6.4g");      // leave default format for now
  gStyle->SetTitleSize(0.055, "");    // size for pad title; default is 0.02
  gStyle->SetLabelSize(0.03, "XYZ");  // size for axis labels; default is 0.04
  gStyle->SetStatFontSize(0.08);      // size for stat. box
  gStyle->SetTitleFont(32, "XYZ");    // times-bold-italic font (p. 153) for axes
  gStyle->SetTitleFont(32, "");       // same for pad title
  gStyle->SetLabelFont(32, "XYZ");    // same for axis labels
  gStyle->SetStatFont(32);            // same for stat. box
  gStyle->SetLabelOffset(0.006, "Y"); // default is 0.005
  //
  return;
}
//
// member functions
//
std::vector<PVStudy::simPrimaryVertex> PVStudy::getSimPVs(const Handle<HepMCProduct> evtMC, std::string suffix="")
{
  std::vector<PVStudy::simPrimaryVertex> simpv;
  const HepMC::GenEvent* evt=evtMC->GetEvent();
  if (evt) {
    edm::LogInfo("SimPVs") << "[getSimPVs] process id " << evt->signal_process_id()<<endl;
    edm::LogInfo("SimPVs") << "[getSimPVs] signal process vertex " << ( evt->signal_process_vertex() ?
                                                                        evt->signal_process_vertex()->barcode() : 0 ) <<endl;
    edm::LogInfo("SimPVs") << "[getSimPVs] number of vertices " << evt->vertices_size() << endl;

    int idx=0; int npv=0;
    for(HepMC::GenEvent::vertex_const_iterator vitr= evt->vertices_begin();
        vitr != evt->vertices_end(); ++vitr ) { // loop for vertex ...
      HepMC::FourVector pos = (*vitr)->position();
      //HepLorentzVector pos = (*vitr)->position();

      // t component of PV:
      for ( HepMC::GenVertex::particle_iterator mother  = (*vitr)->particles_begin(HepMC::parents);
            mother != (*vitr)->particles_end(HepMC::parents); ++mother ) {
        //        edm::LogInfo("SimPVs") << "Status = " << (*mother)->status() << endl;
        HepMC::GenVertex * mv=(*mother)->production_vertex();
        if( ((*mother)->status() == 3) && (!mv)) {
          //        edm::LogInfo("SimPVs") << "npv= " << npv << endl;
          if (npv == 0) {
            h_gen->Fill1d("genPart_cT", pos.t()); // mm
            h_gen->Fill1d("genPart_T", pos.t()/299.792458); // ns
          }
          npv++;
        }
      }
      //       if (pos.t()>0) { continue;} // for 22X when t of PV was not smeared
        
      bool hasMotherVertex=false;
      if (verbose_) cout << "[getSimPVs] mothers of vertex[" << ++idx << "]: " << endl;
      for ( HepMC::GenVertex::particle_iterator mother  = (*vitr)->particles_begin(HepMC::parents);
            mother != (*vitr)->particles_end(HepMC::parents); ++mother ) {
        HepMC::GenVertex * mv=(*mother)->production_vertex();
        // if (verbose_) cout << "Status = " << (*mother)->status() << endl;
        if (mv) {
          hasMotherVertex=true;
          if(!verbose_) break; //if verbose_, print all particles of gen vertices
        }
        if(verbose_) {
          cout << "\t";
          (*mother)->print();
        }
      }

      if(hasMotherVertex) continue;

      // could be a new vertex, check  all primaries found so far to avoid multiple entries
      const double mm2cm=0.1;
      simPrimaryVertex sv(pos.x()*mm2cm,pos.y()*mm2cm,pos.z()*mm2cm); // sim unit mm, rec unit cm
      simPrimaryVertex *vp=NULL;  // will become non-NULL if a vertex is found and then point to it
      for(vector<simPrimaryVertex>::iterator v0=simpv.begin();
          v0!=simpv.end(); v0++){
        if( (fabs(sv.x-v0->x)<1e-5) && (fabs(sv.y-v0->y)<1e-5) && (fabs(sv.z-v0->z)<1e-5)){
          vp=&(*v0);
          break;
        }
      }

      if(!vp){
        // this is a new vertex
        edm::LogInfo("SimPVs") << "[getSimPVs] this is a new vertex " << sv.x << " " << sv.y << " " << sv.z << endl;
        simpv.push_back(sv);
        vp=&simpv.back();
      }else{
        edm::LogInfo("SimPVs") << "[getSimPVs] this is not a new vertex " << sv.x << " " << sv.y << " " << sv.z << endl;
      }
      vp->genVertex.push_back((*vitr)->barcode());
      // collect final state descendants
      for ( HepMC::GenVertex::particle_iterator daughter  = (*vitr)->particles_begin(HepMC::descendants);
            daughter != (*vitr)->particles_end(HepMC::descendants);
            ++daughter ) {
        if (isFinalstateParticle(*daughter)){ 
          if ( find(vp->finalstateParticles.begin(), vp->finalstateParticles.end(),(*daughter)->barcode())
               == vp->finalstateParticles.end()){
            vp->finalstateParticles.push_back((*daughter)->barcode());
            HepMC::FourVector m=(*daughter)->momentum();
            // the next four lines used to be "vp->ptot+=m;" in the days of CLHEP::HepLorentzVector
            // but adding FourVectors seems not to be foreseen
            vp->ptot.setPx(vp->ptot.px()+m.px());
            vp->ptot.setPy(vp->ptot.py()+m.py());
            vp->ptot.setPz(vp->ptot.pz()+m.pz());
            vp->ptot.setE(vp->ptot.e()+m.e());
            vp->ptsq+=(m.perp())*(m.perp());
            if ( (m.perp()>0.8) && (fabs(m.pseudoRapidity())<2.5) && isCharged( *daughter ) ){
              vp->nGenTrk++;
            }
          }
        }
      }//loop MC vertices daughters
    }//loop MC vertices
  }
  return simpv;
}

std::vector<PVStudy::simPrimaryVertex> PVStudy::getSimPVs(const Handle<HepMCProduct> evtMC, 
                                                          const Handle<SimVertexContainer> simVtxs, 
                                                          const Handle<SimTrackContainer> simTrks)
{
  // simvertices don't have enough information to decide, 
  // genVertices don't have the simulated coordinates  ( with VtxSmeared they might)
  // go through simtracks to get the link between simulated and generated vertices
  std::vector<PVStudy::simPrimaryVertex> simpv;
  int idx=0;
  for(SimTrackContainer::const_iterator t=simTrks->begin();
      t!=simTrks->end(); ++t){
    if ( !(t->noVertex()) && !(t->type()==-99) ){
      double ptsq=0;
      bool primary=false;   // something coming directly from the primary vertex
      bool resonance=false; // resonance
      bool track=false;     // undecayed, charged particle
      HepMC::GenParticle* gp=evtMC->GetEvent()->barcode_to_particle( (*t).genpartIndex() );
      if (gp) {
        HepMC::GenVertex * gv=gp->production_vertex();
        if (gv) {
          for ( HepMC::GenVertex::particle_iterator 
                  daughter =  gv->particles_begin(HepMC::descendants);
                daughter != gv->particles_end(HepMC::descendants);
                ++daughter ) {
            if (isFinalstateParticle(*daughter)){
              ptsq+=(*daughter)->momentum().perp()*(*daughter)->momentum().perp();
            }
          }
          //primary =  ( gv->position().t()==0 );
          primary = true;
          h_gen->Fill1d("genPart_cT", gv->position().t()); // mm
          h_gen->Fill1d("genPart_T", gv->position().t()/299.792458); // ns

          //resonance= ( gp->mother() && isResonance(gp->mother()));  // in CLHEP/HepMC days
          // no more mother pointer in the improved HepMC GenParticle
          resonance= ( isResonance(*(gp->production_vertex()->particles_in_const_begin())));
          if (gp->status()==1){
            //track=((pdt->particle(gp->pdg_id()))->charge() != 0);
            track=not isCharged(gp);
          }
        }
      }

      const HepMC::FourVector & v=(*simVtxs)[t->vertIndex()].position();
      //const HepLorentzVector & v=(*simVtxs)[t->vertIndex()].position();
      if(primary or resonance){
        {
          // check all primaries found so far to avoid multiple entries
          bool newVertex=true;
          for(std::vector<PVStudy::simPrimaryVertex>::iterator v0=simpv.begin();
              v0!=simpv.end(); v0++){
            if( (fabs(v0->x-v.x())<0.001) && (fabs(v0->y-v.y())<0.001) && (fabs(v0->z-v.z())<0.001) ){
              if (track) {
                v0->simTrackIndex.push_back(idx);
                if (ptsq>(*v0).ptsq){(*v0).ptsq=ptsq;}
              }
              newVertex=false;
            }
          }
          if(newVertex && !resonance){
            PVStudy::simPrimaryVertex anotherVertex(v.x(),v.y(),v.z());
            if (track) anotherVertex.simTrackIndex.push_back(idx);
            anotherVertex.ptsq=ptsq;
            simpv.push_back(anotherVertex);
          }
        }// 
      }
       
    }// simtrack has vertex and valid type
    idx++;
  }//simTrack loop
  return simpv;
}

// ------------ method called to for each event  ------------
void
PVStudy::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup)
{
  using namespace edm;
  using namespace reco;
  
  edm::LogInfo("Debug")<<"[PVStudy]"<<endl;
  //=======================================================
  // Initialize Root-tuple variables if needed
  //=======================================================
  //if(saventuple_)
  SetVarToZero();
  
  //=======================================================
  // Track accessors
  //=======================================================
  //trackCollection
  static const reco::TrackCollection s_empty_trackColl;
  const reco::TrackCollection *trackColl = &s_empty_trackColl;
  edm::Handle<reco::TrackCollection> trackCollectionHandle;
  iEvent.getByLabel(trackCollectionTag_, trackCollectionHandle);
  if( iEvent.getByLabel(trackCollectionTag_, trackCollectionHandle)) {
    trackColl = trackCollectionHandle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] trackCollection cannot be found -> using empty collection of same type." <<endl;
  }

  //splitTrackCollection1
  static const reco::TrackCollection s_empty_splitTrackColl1;
  const reco::TrackCollection *splitTrackColl1 = &s_empty_splitTrackColl1;
  edm::Handle<reco::TrackCollection> splitTrackCollection1Handle;
  iEvent.getByLabel(splitTrackCollection1Tag_, splitTrackCollection1Handle);
  if( iEvent.getByLabel(splitTrackCollection1Tag_, splitTrackCollection1Handle)) {
    splitTrackColl1 = splitTrackCollection1Handle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] splitTrackCollection1 cannot be found -> using empty collection of same type." <<endl;
  }

  //splitTrackCollection2
  static const reco::TrackCollection s_empty_splitTrackColl2;
  const reco::TrackCollection *splitTrackColl2 = &s_empty_splitTrackColl2;
  edm::Handle<reco::TrackCollection> splitTrackCollection2Handle;
  iEvent.getByLabel(splitTrackCollection2Tag_, splitTrackCollection2Handle);
  if( iEvent.getByLabel(splitTrackCollection2Tag_, splitTrackCollection2Handle)) {
    splitTrackColl2 = splitTrackCollection2Handle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] splitTrackCollection2 cannot be found -> using empty collection of same type." <<endl;
  }


  //=======================================================
  // Fill trackparameters of the input tracks to pvtx fitter
  //=======================================================
  edm::LogInfo("Debug")<<"[PVStudy] Start filling track parameters of the input tracks to pvtx fitter."<<endl;
  //fillTrackHisto(const reco::TrackCollection *trackColl, int datatype) 
  // datatype: unsplittracks (0); splittracks1 (1);  splittracks2 (2);
  fillTrackHisto(trackColl, 0); 
  fillTrackHisto(splitTrackColl1, 1);
  fillTrackHisto(splitTrackColl2, 2); 
  edm::LogInfo("Debug")<<"[PVStudy] End filling track parameters of the input tracks to pvtx fitter."<<endl;
 
  //=======================================================
  // PVTX accessors
  //=======================================================
  //vertexCollection
  static const reco::VertexCollection s_empty_vertexColl;
  const reco::VertexCollection *vertexColl = &s_empty_vertexColl;
  edm::Handle<reco::VertexCollection> vertexCollectionHandle;
  iEvent.getByLabel(vertexCollectionTag_, vertexCollectionHandle);
  if( iEvent.getByLabel(vertexCollectionTag_, vertexCollectionHandle)) {
    vertexColl = vertexCollectionHandle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] vertexCollection cannot be found -> using empty collection of same type." <<endl;
  }
 
  //splitVertexCollection1
  static const reco::VertexCollection s_empty_splitVertexColl1;
  const reco::VertexCollection *splitVertexColl1 = &s_empty_splitVertexColl1;
  edm::Handle<reco::VertexCollection> splitVertexCollection1Handle;
  iEvent.getByLabel(splitVertexCollection1Tag_, splitVertexCollection1Handle);
  if( iEvent.getByLabel(splitVertexCollection1Tag_, splitVertexCollection1Handle)) {
    splitVertexColl1 = splitVertexCollection1Handle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] splitVertexCollection1 cannot be found -> using empty collection of same type." <<endl;
  } 
 
  //splitVertexCollection2
  static const reco::VertexCollection s_empty_splitVertexColl2;
  const reco::VertexCollection *splitVertexColl2 = &s_empty_splitVertexColl2;
  edm::Handle<reco::VertexCollection> splitVertexCollection2Handle;
  iEvent.getByLabel(splitVertexCollection2Tag_, splitVertexCollection2Handle);
  if( iEvent.getByLabel(splitVertexCollection2Tag_, splitVertexCollection2Handle)) {
    splitVertexColl2 = splitVertexCollection2Handle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] splitVertexCollection2 cannot be found -> using empty collection of same type." <<endl;
  }
  
  edm::LogInfo("Debug")<<"[PVStudy] End accessing the track and vertex collections"<<endl;
  
  //=======================================================
  // MC simvtx accessor
  //=======================================================
  if (!realData_) {
    edm::Handle<SimVertexContainer> simVtxs;
    iEvent.getByLabel( simG4_, simVtxs);
    
    edm::Handle<SimTrackContainer> simTrks;
    iEvent.getByLabel( simG4_, simTrks);
  }

  //=======================================================
  // GET PDT
  //=======================================================
  try{
    iSetup.getData(pdt);
  }catch(const Exception&){
    edm::LogInfo("Debug") << "[PVStudy] Some problem occurred with the particle data table. This may not work !." <<endl;
  }
  
  //=======================================================
  // GET pixelVertices
  //=======================================================
  static const reco::VertexCollection s_empty_pixelVertexColl;
  const reco::VertexCollection *pixelVertexColl = &s_empty_pixelVertexColl;
  edm::Handle<reco::VertexCollection>  pixelVertexCollectionHandle;
  iEvent.getByLabel(pixelVertexCollectionTag_, pixelVertexCollectionHandle);
  if( iEvent.getByLabel(pixelVertexCollectionTag_, pixelVertexCollectionHandle)) {
    pixelVertexColl = pixelVertexCollectionHandle.product();
  } else {
    edm::LogInfo("Debug") << "[PVStudy] pixelVertexCollection cannot be found. -> using empty collection of same type." <<endl;
  }

  //=======================================================
  // Fill pixelVertices related histograms
  //=======================================================
  nrecPV_pxlpvtx_ = int (pixelVertexColl->size());
  if(pixelVertexColl->size()>0 && pixelVertexColl->begin()->isValid() && !(pixelVertexColl->begin()->isFake())) {
    //fillTrackHistoInPV(const reco::VertexCollection *vertexColl, int datatype, bool fillHisto, bool fillNtuple) {
    fillTrackHistoInPV(pixelVertexColl, 4, false, true);
    h_pixvtx->Fill1d("dzErr_pxlpvtx", pixelVertexColl->begin()->zError());    
    // Get the dZ error of the tracks in the leading pixelVertexColl
    for(reco::Vertex::trackRef_iterator t = (pixelVertexColl->begin())->tracks_begin(); 
        t!= (pixelVertexColl->begin())->tracks_end(); t++) {
      
      if ( (**t).charge() < -1 || (**t).charge() > 1 ) {
        //        h_pvtrk->Fill1d("trkPtPV", 0.);
      }
      else 
        h_pixvtx->Fill1d("trkdzErr_pxlpvtx", (**t).dzError());
    }
    // Fill the track->dz() in the PV difference from first pixelpvtx
    for(reco::Vertex::trackRef_iterator t = (vertexColl->begin())->tracks_begin(); 
        t!= (vertexColl->begin())->tracks_end(); t++) {
      // illegal charge
      if ( (**t).charge() < -1 || (**t).charge() > 1 ) {
        //        h_pvtrk->Fill1d("trkPtPV", 0.);
      }
      else {
        if(pixelVertexColl->size()>0) {
          h_pixvtx->Fill1d("trkdz_pxlpvtxdz", (**t).dz() -  pixelVertexColl->begin()->z());
          h_pixvtx->Fill1d("trkdz_pxlpvtxdz_pxlpvtxdzerr", fabs((**t).dz() -  pixelVertexColl->begin()->z())/pixelVertexColl->begin()->zError());
          h_pixvtx->Fill1d("trkdz_pxlpvtxdz_trkdzerr", fabs((**t).dz() -  pixelVertexColl->begin()->z())/(**t).dzError());
          h_pixvtx->Fill1d("trkdzErr_pvtx", (**t).dzError()); 
        }
      }
    }
  }
 
  //=======================================================
  // Fill number of reconstructed vertices
  //=======================================================

  edm::LogInfo("Debug")<<"[PVStudy] Printing vertexCollection: "<<endl;
  edm::LogInfo("Debug")<<"[PVStudy] Printing splitVertexCollection1: "<<endl;
  edm::LogInfo("Debug")<<"[PVStudy] Printing splitVertexCollection2: "<<endl;
  edm::LogInfo("Debug")<<"[PVStudy] Start filling pvtx parameters."<<endl; 
  if (verbose_) {
    printRecVtxs(vertexCollectionHandle);
    printRecVtxs(splitVertexCollection1Handle);
    printRecVtxs(splitVertexCollection2Handle);
  }
  nrecPV_ = int (vertexColl->size());
  nrecPV1_spl_ = int (splitVertexColl1->size());
  nrecPV2_spl_ = int (splitVertexColl2->size());

  h_pvtrk->Fill1d("nrecPV", nrecPV_);
  h_pvtrk->Fill1d("nrecPV1_spl", nrecPV1_spl_);
  h_pvtrk->Fill1d("nrecPV2_spl", nrecPV2_spl_);
  h_misc->Fill1d("nrecPVDiff", double(nrecPV1_spl_)-double(nrecPV2_spl_));
  
  //=================================================================
  // Fill track parameter ntuple/hist for tracks used in recoVertices
  //=================================================================

  //fillTrackHistoInPV(const reco::VertexCollection *vertexColl, int datatype, bool fillHisto, bool fillNtuple) {
  if(vertexColl->size() > 0 && vertexColl->begin()->isValid() && !(vertexColl->begin()->isFake())) 
    fillTrackHistoInPV(vertexColl, 0, true, true);
  
  if(splitVertexColl1->size() > 0 && splitVertexColl1->begin()->isValid() && !(splitVertexColl1->begin()->isFake())) 
    fillTrackHistoInPV(splitVertexColl1, 1, false, true);

  if(splitVertexColl1->size() > 0 && splitVertexColl2->begin()->isValid() && !(splitVertexColl2->begin()->isFake())) 
    fillTrackHistoInPV(splitVertexColl2, 2, false, true); 


  //=======================================================
  // Compare offlinePrimaryVertices with pixelVertices
  //=======================================================
  if( (pixelVertexColl->size()>0 && pixelVertexColl->begin()->isValid() && !(pixelVertexColl->begin()->isFake()))
      && (vertexColl->size()>0 && vertexColl->begin()->isValid() && !(vertexColl->begin()->isFake())) ) {    
    h_pixvtx->Fill1d("nrecPV_minus_nrecPxlPV", double (nrecPV_ - nrecPV_pxlpvtx_));
    // difference in reconstructed position of the leading pvtx
    //edm::LogInfo("Debug")<<"recx_[0] = "<< recx_[0] << "recx_pxlpvtx_[0] = "<< recx_pxlpvtx_[0]<<endl;  
    //edm::LogInfo("Debug")<<"recy_[0] = "<< recy_[0] << "recy_pxlpvtx_[0] = "<< recy_pxlpvtx_[0]<<endl;
    h_pixvtx->Fill1d("recxPV_minus_recxPxlPV", recx_[0] - recx_pxlpvtx_[0]);
    h_pixvtx->Fill1d("recyPV_minus_recyPxlPV", recy_[0] - recy_pxlpvtx_[0]);
    h_pixvtx->Fill1d("reczPV_minus_reczPxlPV", recz_[0] - recz_pxlpvtx_[0]);
  }
  

  //==========================================================
  // Fill secondary/primary min separations for multi-vertices 
  //==========================================================
  
  if(vertexColl->size()>1 && vertexColl->begin()->isValid() && !(vertexColl->begin()->isFake()) ) {  
 
    double min_xsep = 9999.0; 
    double min_ysep = 9999.0; 
    double min_zsep = 9999.0;    
    double min_xsep_sign = 9999.0; 
    double min_ysep_sign = 9999.0; 
    double min_zsep_sign = 9999.0; 
    double min_ntrksep = 9999.0; 
    double min_sumpt2sep = 9999999.0; 
    
    edm::LogInfo("Debug")<<"[PVStudy] leading pvtx z = "<< vertexColl->begin()->z() <<endl;

    // Looping through the secondary vertices to find the mininum separation to the primary
    for(reco::VertexCollection::const_iterator v=vertexColl->begin() + 1 ; 
        v!=vertexColl->end(); ++v) {  
      if(v->isValid() && ! v->isFake()) {
        // xsep
        if(fabs(v->x()- vertexColl->begin()->x())<min_xsep) 
          min_xsep = fabs(v->x()- vertexColl->begin()->x());
        // ysep
        if(fabs(v->y()- vertexColl->begin()->y())<min_ysep) 
          min_ysep = fabs(v->y()- vertexColl->begin()->y());
        // zsep
        if(fabs(v->z()- vertexColl->begin()->z())<min_zsep) 
          min_zsep = fabs(v->z()- vertexColl->begin()->z());
        // xsep_sign
        double xsep_sign = fabs(v->x()- vertexColl->begin()->x())/max(v->xError(), vertexColl->begin()->xError()); 
        if(xsep_sign < min_xsep_sign) 
          min_xsep_sign = xsep_sign; 
        // ysep_sign
        double ysep_sign = fabs(v->y()- vertexColl->begin()->y())/max(v->yError(), vertexColl->begin()->yError()); 
        if(ysep_sign < min_ysep_sign) 
          min_ysep_sign = ysep_sign; 
        // zsep_sign
        double zsep_sign = fabs(v->z()- vertexColl->begin()->z())/max(v->zError(), vertexColl->begin()->zError()); 
        if(zsep_sign < min_zsep_sign) 
          min_zsep_sign = zsep_sign; 
        // ntrksep
        if( (double(vertexColl->begin()->tracksSize()) - double(v->tracksSize())) < min_ntrksep)
          min_ntrksep = double(vertexColl->begin()->tracksSize()) - double(v->tracksSize()); 
        // sumpt2sep
        if(fabs(sumPtSquared(*v) - sumPtSquared(*(vertexColl->begin()))) < min_sumpt2sep) 
          min_sumpt2sep = fabs(sumPtSquared(*v) - sumPtSquared(*(vertexColl->begin())));
      }
    }
    h_misc->Fill1d("min_xsep", min_xsep); 
    h_misc->Fill1d("min_ysep", min_ysep); 
    h_misc->Fill1d("min_zsep", min_zsep); 
    h_misc->Fill1d("min_xsep_sign", min_xsep_sign); 
    h_misc->Fill1d("min_ysep_sign", min_ysep_sign); 
    h_misc->Fill1d("min_zsep_sign", min_zsep_sign); 
    h_misc->Fill1d("min_ntrksep", min_ntrksep); 
    h_misc->Fill1d("min_sumpt2sep", min_sumpt2sep); 

    min_zsep_ = min_zsep;
    min_ntrksep_ = min_ntrksep;
    min_sumpt2sep_ = min_sumpt2sep;


  } // End of  if(vertexColl->size()>1) { 
  
  edm::LogInfo("Debug")<<"[PVStudy] End filling pvtx parameters."<<endl;
  
  //=======================================================
  //           PrimaryVertex Matching
  // 1. In z  |z1-z2|< zsigncut * max(sigmaz1, sigmaz2)
  // 2. |(nTrkPV1 - nTrkPV2)/(nTrkPV1+nTrkPV2)|<ntrkdiffcut_
  // Assume the first match is the primary vertex, 
  // since vertexColl are sorted in decreasing order of sum(pT) 
  //======================================================= 

  edm::LogInfo("Debug")<<"[PVStudy] matching pvtxs "<<endl;
  reco::VertexCollection s_empty_matchedVertexColl1;
  reco::VertexCollection *matchedVertexColl1 = &s_empty_matchedVertexColl1; 
  matchedVertexColl1->reserve(splitVertexColl1->size()); 
  reco::VertexCollection s_empty_matchedVertexColl2;
  reco::VertexCollection *matchedVertexColl2 = &s_empty_matchedVertexColl2; 
  matchedVertexColl2->reserve(splitVertexColl2->size());
  
  bool stopmatching = false; 
  for (size_t ivtx = 0; ivtx<splitVertexCollection1Handle->size() && !stopmatching; ++ivtx) {
    reco::VertexRef recvtx1(splitVertexCollection1Handle, ivtx);
    if( !(recvtx1->isValid()) || recvtx1->isFake()) break;
    for (size_t jvtx = ivtx; jvtx < splitVertexCollection2Handle->size(); ++jvtx) {    
      //------------------------------------------------------------------------
      //== If only considering matching the first vertex of the splitVertexColl
      //------------------------------------------------------------------------
      if (ivtx!=0 || jvtx!=0) { stopmatching = true; break; } 
      reco::VertexRef recvtx2(splitVertexCollection2Handle, jvtx);
      if( !(recvtx2->isValid()) || recvtx2->isFake()) break;
      edm::LogInfo("Debug")<<"[PVStudy] Matching splitVertexColl1: #  "<< ivtx<< " and splitVertexColl1: # "<<jvtx<<endl;
      edm::LogInfo("Debug")<<"[PVStudy] recvtx1->z() = " << recvtx1->z() << "+/- "<< recvtx1->zError() << "." << endl;
      edm::LogInfo("Debug")<<"[PVStudy] recvtx2->z() = " << recvtx2->z() << "+/- "<< recvtx2->zError() << "." << endl;

      if(matchVertex(recvtx1, recvtx2, zsigncut_)) {
        edm::LogInfo("Debug")<<"[PVStudy] The two splitted vertices match in Z. "<<endl;

        int nTrkPV1 = recvtx1->tracksSize();
        int nTrkPV2 = recvtx2->tracksSize();     
        double ntrkreldiff = double(nTrkPV1-nTrkPV2)/double(nTrkPV1+nTrkPV2);
        h_misc->Fill1d("nTrkPVDiff", nTrkPV1-nTrkPV2);
        h_misc->Fill1d("nTrkPVRelDiff", ntrkreldiff);
        if(fabs(ntrkreldiff)<ntrkdiffcut_) {    
          edm::LogInfo("Debug")<<"[PVStudy] (nTrkPV1-nTrkPV2)/(nTrkPV1+nTrkPV2) = " << ntrkreldiff<<endl;

          matchedVertexColl1->push_back(*recvtx1);
          matchedVertexColl2->push_back(*recvtx2);
          stopmatching = true; // stop the matching when the first match is found!
          break;
        }
        else 
          edm::LogInfo("Debug")<<"WARNING: (nTrkPV1-nTrkPV2)/(nTrkPV1+nTrkPV2) = " << ntrkreldiff<<", exceeding cut "<<ntrkdiffcut_<<endl; 
      }
      else {
        edm::LogInfo("Debug")<<"WARNING: The two reconstructed vertices do not match in z: "<<endl;
        edm::LogInfo("Debug")<<"recvtx1->z() = " << recvtx1->z() << "+/- "<< recvtx1->zError() << "." << endl;
        edm::LogInfo("Debug")<<"recvtx2->z() = " << recvtx2->z() << "+/- "<< recvtx2->zError() << "." << endl;  
      }
    }
  } 
  edm::LogInfo("Debug")<<"[PVStudy] End matching pvtxs"<<endl;
  
  //=======================================================
  //  Analyze matchedVertexColls
  //======================================================= 
  edm::LogInfo("Debug")<<"[PVStudy] Begin analyzing the matchedVertexColl with size = "<< matchedVertexColl1->size()<< endl;
  
  // Compare the reconstructed vertex position and calculate resolution/pulls
  if(matchedVertexColl1->size() != 0 && matchedVertexColl2->size() != 0) {  
    //fillPvtxHisto(const reco::VertexCollection *vertexColl, int datatype, bool fillHisto, bool fillNtuple)
    fillTrackHistoInPV(matchedVertexColl1, 1, true, false);
    fillTrackHistoInPV(matchedVertexColl2, 2, true, false);

    reco::VertexCollection::const_iterator v1; 
    reco::VertexCollection::const_iterator v2; 
    nrecPV_twovtx_ = 0;
    for(v1 = matchedVertexColl1->begin(), v2 = matchedVertexColl2->begin(); 
        v1!=matchedVertexColl1->end(), v2 != matchedVertexColl2->end(); 
        ++v1, ++v2) {
      fres_[0] = (v1->x()-v2->x())/sqrt(2.0);
      fres_[1] = (v1->y()-v2->y())/sqrt(2.0);
      fres_[2] = (v1->z()-v2->z())/sqrt(2.0);
      ferror_[0] = sqrt(pow(v1->xError(),2)+pow(v2->xError(),2))/sqrt(2);
      ferror_[1] = sqrt(pow(v1->yError(),2)+pow(v2->yError(),2))/sqrt(2);
      ferror_[2] = sqrt(pow(v1->zError(),2)+pow(v2->zError(),2))/sqrt(2);
      fntrk_ =  (v1->tracksSize()+v2->tracksSize())/2; 
      
      h_summary->Fill1d("deltax", fres_[0] );
      h_summary->Fill1d("deltay", fres_[1] );
      h_summary->Fill1d("deltaz", fres_[2] );
      h_summary->Fill1d("pullx", fres_[0]/ferror_[0]);
      h_summary->Fill1d("pully", fres_[1]/ferror_[1]);
      h_summary->Fill1d("pullz", fres_[2]/ferror_[2]);
      h_summary->Fill1d("errPVx", ferror_[0] );
      h_summary->Fill1d("errPVy", ferror_[1] );
      h_summary->Fill1d("errPVz", ferror_[2] );
      pvinfo.push_back(PVStudy::PVInfo(res(fres_[0], fres_[1], fres_[2]),
                                       error(ferror_[0], ferror_[1], ferror_[2]),
                                       fntrk_));
      // Fill histo according to its track multiplicity, set datamode = 0 for pvtx using all tracks
      fillHisto(res(fres_[0], fres_[1], fres_[2]),
                error(ferror_[0], ferror_[1], ferror_[2]),
                fntrk_,0);  
      // Fill the ntuple variables
      nTrkPV1_spl_twovtx_[nrecPV_twovtx_] = v1->tracksSize(); 
      nTrkPV2_spl_twovtx_[nrecPV_twovtx_] = v2->tracksSize(); 
      sumptsq1_spl_twovtx_[nrecPV_twovtx_] = sumPtSquared(*v1); 
      sumptsq2_spl_twovtx_[nrecPV_twovtx_] = sumPtSquared(*v2);
      nTrkPV_twovtx_[nrecPV_twovtx_] = fntrk_;
      deltax_twovtx_[nrecPV_twovtx_] = fres_[0];
      deltay_twovtx_[nrecPV_twovtx_] = fres_[1];
      deltaz_twovtx_[nrecPV_twovtx_] = fres_[2];
      errx_twovtx_[nrecPV_twovtx_] = ferror_[0];
      erry_twovtx_[nrecPV_twovtx_] = ferror_[1];
      errz_twovtx_[nrecPV_twovtx_] = ferror_[2];
      pullx_twovtx_[nrecPV_twovtx_] = fres_[0]/ferror_[0];
      pully_twovtx_[nrecPV_twovtx_] = fres_[1]/ferror_[1]; 
      pullz_twovtx_[nrecPV_twovtx_] = fres_[2]/ferror_[2];     
      nrecPV_twovtx_++;
    } // End of analyzing res/pull
  } // End of  if(matchedVertexColl1->size() == 1 && matchedVertexColl2->size() == 1 ) {
  else 
    edm::LogInfo("Debug")<<"[PVStudy] WARNING: Cannot find matching pvtxs"<<endl;
  
  edm::LogInfo("Debug")<<"[PVStudy] End analyzing the matchedVertexColl"<<endl;

  //=======================================================
  // Fill simulated vertices 
  //=======================================================
  if (!realData_) {
    bool MC=false;
    Handle<HepMCProduct> evtMC;
    iEvent.getByLabel("generator",evtMC);
    if (!evtMC.isValid()) {
      MC=false;
      edm::LogInfo("Debug") << "[PVStudy] no HepMCProduct found"<< endl;
    } else {
      edm::LogInfo("Debug") << "[PVStudy] generator HepMCProduct found"<< endl;
      MC=true;
    }
    
    if(MC){
      // make a list of primary vertices:
      std::vector<simPrimaryVertex> simpv;
      simpv=getSimPVs(evtMC,"");
      //     simpv=getSimPVs(evtMC, simVtxs, simTrks);
      h_gen->Fill1d("nsimPV", simpv.size());
      nsimPV_ = simpv.size();

      int isimpv = 0; 
      for(std::vector<simPrimaryVertex>::iterator vsim=simpv.begin();
          vsim!=simpv.end(); vsim++, isimpv++){
        nsimTrkPV_[isimpv]  =vsim->nGenTrk;
        simx_[isimpv] = vsim->x;
        simy_[isimpv] = vsim->y;
        simz_[isimpv] = vsim->y;
        simptsq_[isimpv] = vsim->ptsq;
        
        //fillMCHisto((std::vector<simPrimaryVertex>::iterator vsim, int isimpv, const reco::VertexCollection *vtxColl, int datatype) {
        fillMCHisto(vsim, isimpv, splitVertexColl1, 1);
        fillMCHisto(vsim, isimpv, splitVertexColl2, 2);
        fillMCHisto(vsim, isimpv, vertexColl, 3);
      } 
    } // End of  for(std::vector<simPrimaryVertex>::iterator vsim=simpv.begin()
  } // End of   if (!realData_) {

  // Finally fill the ftree_
  if(saventuple_) {
    ftree_->Fill();
    pvtxtree_->Fill();
  }
}

// ------------ method called once each job just before starting event loop  ------------
void 
PVStudy::beginJob()
{
}

// ------------ method called once each job just after ending the event loop  ------------
void 
PVStudy::endJob() {
  edm::LogInfo("Analysis") << "[endJob] Analyzing PV info" << endl;
  // Looping through the datamodes available
  for (vector<int>::const_iterator it= datamode.begin(); it != datamode.end() ; ++it) {  
    string suffix; 
    edm::LogInfo("Analysis")<<"[endJob] datamode = "<< *it<<endl;
    switch(*it) {
    case 0: suffix = "";
      break;
    case 1: suffix = "_spl1_mct";
      break;
    case 2: suffix = "_spl2_mct";       
      break;
    case 3: suffix = "_mct";
      break;
    }
    suffix += "_nTrk";
    if(analyze_) {
      for (int ntrk=nTrkMin_;ntrk<=nTrkMax_;++ntrk) {
        edm::LogInfo("Analysis") << "[endJob] ntrk = " << ntrk << endl;
        PVStudy::PVAnaInfo ipv = GetPVAnaInfo(ntrk,*it);
        if ( ipv.res_.x() > 0 ) h_ana->Fill2d("resx"+suffix, ntrk,ipv.res_.x());
        if ( ipv.res_.y() > 0 ) h_ana->Fill2d("resy"+suffix, ntrk,ipv.res_.y());
        if ( ipv.res_.z() > 0 ) h_ana->Fill2d("resz"+suffix, ntrk,ipv.res_.z());
        if ( ipv.pull_.x() > 0 ) h_ana->Fill2d("pullx"+suffix, ntrk,ipv.pull_.x());
        if ( ipv.pull_.y() > 0 ) h_ana->Fill2d("pully"+suffix, ntrk,ipv.pull_.y());
        if ( ipv.pull_.z() > 0 ) h_ana->Fill2d("pullz"+suffix, ntrk,ipv.pull_.z());
      }
    }
    suffix.clear();
  }
  if(saventuple_) {
    file_->cd();
    ftree_->Write();
    pvtxtree_->Write();
    file_->Close();
  }
}


// Match a recovertex with a simvertex
// ? Should the cut be parameter dependent? 
// cut can be within n sigma of the vertex.zerror()
bool PVStudy::matchVertex(const PVStudy::simPrimaryVertex & vsim, 
                          const reco::Vertex & vrec)
{
  return (fabs(vsim.z-vrec.z())<0.0500); // =500um
}

// Match two reconstructed vertices
bool PVStudy::matchVertex( const reco::VertexRef & vrec1, 
                           const reco::VertexRef & vrec2, 
                           int zsigncut)
{
  double cut = zsigncut*max(vrec1->zError(), vrec2->zError()); 
  edm::LogInfo("Debug")<<"[matchVertex] The matching criteria in z is "<<cut<<endl;
  return (fabs(vrec1->z()-vrec2->z())<cut);
}


bool PVStudy::isResonance(const HepMC::GenParticle * p){
  double ctau=(pdt->particle( abs(p->pdg_id()) ))->lifetime();
  edm::LogInfo("Debug") << "[isResonance] isResonance   " << p->pdg_id() << " " << ctau << endl;
  return  ctau >0 && ctau <1e-6;
}

bool PVStudy::isFinalstateParticle(const HepMC::GenParticle * p){
  return ( !p->end_vertex() && p->status()==1 );
}

bool PVStudy::isCharged(const HepMC::GenParticle * p){
  const ParticleData * part = pdt->particle( p->pdg_id() );
  if (part){
    return part->charge()!=0;
  }else{
    // the new/improved particle table doesn't know anti-particles
    return  pdt->particle( -p->pdg_id() )!=0;
  }
}

void PVStudy::printSimVtxs(const Handle<SimVertexContainer> simVtxs){
  int i=0;
  for(SimVertexContainer::const_iterator vsim=simVtxs->begin();
      vsim!=simVtxs->end(); ++vsim){
    cout << i++ << ")" << scientific
         << " evtid=" << vsim->eventId().event() 
         << " sim x=" << vsim->position().x()
         << " sim y=" << vsim->position().y()
         << " sim z=" << vsim->position().z()
         << " sim t=" << vsim->position().t()
         << " parent=" << vsim->parentIndex() 
         << endl;
  }
}

void PVStudy::printRecVtxs(const Handle<reco::VertexCollection> recVtxs){
  int ivtx=0;
  for(reco::VertexCollection::const_iterator v=recVtxs->begin(); 
      v!=recVtxs->end(); ++v){
    cout << "Recvtx "<< std::setw(3) << std::setfill(' ')<<ivtx++
         << "#trk " << std::setw(3) << v->tracksSize() 
         << " chi2 " << std::setw(4) << v->chi2() 
         << " ndof " << std::setw(3) << v->ndof() << endl 
         << " x "  << std::setw(8) <<std::fixed << std::setprecision(4) << v->x() 
         << " dx " << std::setw(8) << v->xError()<< endl
         << " y "  << std::setw(8) << v->y() 
         << " dy " << std::setw(8) << v->yError()<< endl
         << " z "  << std::setw(8) << v->z() 
         << " dz " << std::setw(8) << v->zError()
         << endl;
  }
}

void PVStudy::printSimTrks(const Handle<SimTrackContainer> simTrks){
  cout <<  " simTrks   type, (momentum), vertIndex, genpartIndex"  << endl;
  int i=1;
  for(SimTrackContainer::const_iterator t=simTrks->begin();
      t!=simTrks->end(); ++t){
    //HepMC::GenParticle* gp=evtMC->GetEvent()->particle( (*t).genpartIndex() );
    cout << i++ << ")" 
         << (*t)
         << " index="
         << (*t).genpartIndex();
    //if (gp) {
    //  HepMC::GenVertex *gv=gp->production_vertex();
    //  cout  <<  " genvertex =" << (*gv);
    //}
    cout << endl;
  }
}

void PVStudy::fillHisto(res r, error er, int ntk, int datamode){
  stringstream ss;
  ss << ntk;
  string suffix;
  if(datamode == 0 )  suffix = "_" + ss.str();
  if(datamode == 1 )  suffix = "_spl1_mct_" + ss.str();
  if(datamode == 2 )  suffix = "_spl2_mct_" + ss.str();
  if(datamode == 3 )  suffix = "_mct_" + ss.str();
  
  if (ntk < nTrkMin_ || ntk > nTrkMax_ ) return;
  // Fill histograms of res and pull of ntk
  h_others->Fill1d("deltax"+suffix, r.x());
  h_others->Fill1d("deltay"+suffix, r.y());
  h_others->Fill1d("deltaz"+suffix, r.z()); 
  h_others->Fill1d("pullx"+suffix, r.x()/er.x());
  h_others->Fill1d("pully"+suffix, r.y()/er.y());
  h_others->Fill1d("pullz"+suffix, r.z()/er.z());  
  h_others->Fill1d("errPVx"+suffix, er.x());
  h_others->Fill1d("errPVy"+suffix, er.y());
  h_others->Fill1d("errPVz"+suffix, er.z());
}

PVStudy::PVAnaInfo PVStudy::GetPVAnaInfo(int ntk, int datamode) {
  map<int,double> data;
  data.clear();
  double fpar[2] = {-999,-999};
  double cm2um = 10000;
  stringstream ss;
  ss << ntk;
  string suffix = ss.str(); 
  if(datamode == 0 )  suffix = "_" + suffix;
  if(datamode == 1 )  suffix = "_spl1_mct_" + suffix;
  if(datamode == 2 )  suffix = "_spl2_mct_" + suffix;
  if(datamode == 3 )  suffix = "_mct_" + suffix;
  
  if(analyze_) {
    for ( int i = 0; i < 6; ++i) {
      switch (i) {
      case 0:
        if (!h_others->ReadHisto1D("deltax"+suffix)) break;
        fit(h_others->ReadHisto1D("deltax"+suffix), fpar);
        data[i] = fpar[0]*cm2um;
        break;
      case 1:
        if (!h_others->ReadHisto1D("deltay"+suffix)) break;
        fit(h_others->ReadHisto1D("deltay"+suffix), fpar);
        data[i] = fpar[0]*cm2um;
        break;
      case 2:
        if (!h_others->ReadHisto1D("deltaz"+suffix)) break;
        fit(h_others->ReadHisto1D("deltaz"+suffix), fpar);
        data[i] = fpar[0]*cm2um;
        break;
      case 3:
        if (!h_others->ReadHisto1D("pullx"+suffix)) break;
        fit(h_others->ReadHisto1D("pullx"+suffix), fpar);
        data[i] = fpar[0];
        break;
      case 4:
        if (!h_others->ReadHisto1D("pully"+suffix)) break;
        fit(h_others->ReadHisto1D("pully"+suffix), fpar);
        data[i] = fpar[0];
        break;
      case 5:
        if (!h_others->ReadHisto1D("pullz"+suffix)) break;
        fit(h_others->ReadHisto1D("pullz"+suffix), fpar);
        data[i] = fpar[0];
        break;
      }
      if (data[i] > 0) edm::LogInfo("Analysis") << "[Analysis] data[" << i << "] = " << data[i] << (i<3?" micro m":" ") << endl;
    }
  }
  else
    for ( int i = 0; i < 6; ++i) {
      data[i] = -999;
    }

  return PVStudy::PVAnaInfo(res(data[0], data[1], data[2]),
                            error(0.,0.,0.),
                            pull(data[3], data[4], data[5]),
                            error(0.,0.,0.),
                            ntk);
}

void PVStudy::fit(TH1 *hdist, double fitPars[]){
  TAxis *axis0 = hdist->GetXaxis();
  int nbin = axis0->GetLast();
  double nOF = hdist->GetBinContent(nbin+1);
  double nUF = hdist->GetBinContent(0);
  //   double fitRange = axis0->GetBinUpEdge(nbin);
  double fitRange = axis0->GetXmax();
  double sigMax[2] = {0.,0.};

  edm::LogInfo("Analysis") << "[Fit] Last bin = " << nbin
                           << "; hdist: Overflow Entries = " << nOF
                           << "; Underflow Entries = " << nUF
                           << "; hdist->GetEntries() = " << hdist->GetEntries()
                           << "; fitting range = " << -fitRange << " to " << fitRange << endl;

  if (hdist->GetEntries() - nOF - nUF >= 10) { // FIXME: for reasonable Gaussian fit
    for (int bi = 0; bi < nbin; bi++) {
      if ( (axis0->GetBinLowEdge(bi) < 0) && (hdist->GetBinContent(bi) > 0) ) {
        sigMax[0] = axis0->GetBinLowEdge(bi);
        if ( abs(sigMax[0]) > abs(sigMax[1]) ) sigMax[1] = abs(sigMax[0]);
      }
      if ( (axis0->GetBinLowEdge(bi) >= 0) && (hdist->GetBinContent(bi) > 0) ) {
        sigMax[0] = axis0->GetBinUpEdge(bi);
        if ( abs(sigMax[0]) > abs(sigMax[1]) ) sigMax[1] = abs(sigMax[0]);
      }
    }
    //edm::LogInfo("Analysis") << "[Fit] Fit sigMax = " << sqrt(2.)*sigMax[1] << endl;

    TF1 *fgaus = new TF1("fgaus","gaus",-fitRange, fitRange);
    fgaus->SetParameter(1, 0.);
    fgaus->SetParLimits(1, -fitRange/40., fitRange/40.);
    fgaus->SetParLimits(2, 0., sqrt(2.)*sigMax[1]);
    fgaus->SetLineColor(4);
    hdist->Fit(fgaus,"Q");
    gPad->Update();
    TPaveStats *s = (TPaveStats*) hdist->GetListOfFunctions()->FindObject("stats");
    s->SetOptStat(1111111);
    s->SetOptFit(0111);
    gPad->Update();
    //edm::LogInfo("Analysis") << "[Fit] got function" << endl;
    fitPars[0] = ((fgaus->GetParameter(2))?fgaus->GetParameter(2):-999);
  }
  else 
    fitPars[0] = -999;
}

void PVStudy::fillTrackHisto(const reco::TrackCollection *trackColl, int datatype) {
  string suffix;
  suffix = ""; // for unsplit tracks
  if(datatype == 1) suffix = "1_spl"; // for splittracks 1
  if(datatype == 2) suffix = "2_spl"; // for splittracks 2
  
  h_pvtrk->Fill1d("nTrk"+suffix, trackColl->size());
  for(reco::TrackCollection::const_iterator itTrack = trackColl->begin();
      itTrack != trackColl->end();                      
      ++itTrack) {
    h_pvtrk->Fill1d("trkPt"+suffix, itTrack->pt());
    h_pvtrk->Fill1d("trkDxy"+suffix, itTrack->dxy());
    h_pvtrk->Fill1d("trkDz"+suffix, itTrack->dz());
    h_pvtrk->Fill1d("trkEta"+suffix, itTrack->eta());
    h_pvtrk->Fill1d("trkPhi"+suffix, itTrack->phi());
  }
}

void PVStudy::fillTrackHistoInPV(const reco::VertexCollection *vertexColl, int datatype, bool fillHisto, bool fillNtuple) {
  string suffix;
  suffix = ""; // for unsplit tracks
  if(datatype == 1) suffix = "1_spl"; // for splittracks 1
  if(datatype == 2) suffix = "2_spl"; // for splittracks 2
  int ivtx = 0; 
  for(reco::VertexCollection::const_iterator v=vertexColl->begin(); 
      v!=vertexColl->end(); ++v, ++ivtx) {  
    if(fillNtuple) {
      if(datatype == 0) {
        nTrkPV_[ivtx] = v->tracksSize();        
        sumptsq_[ivtx] = sumPtSquared(*v); 
        isValid_[ivtx] = v->isValid();
        isFake_[ivtx] = v->isFake();    
        recx_[ivtx] = v->x();
        recy_[ivtx] = v->y();
        recz_[ivtx] = v->z();
        recx_err_[ivtx] = v->xError();
        recy_err_[ivtx] = v->yError();
        recz_err_[ivtx] = v->zError();
      }
      if(datatype == 1) {
        nTrkPV1_spl_[ivtx] = v->tracksSize();   
        sumptsq1_spl_[ivtx] = sumPtSquared(*v);         
        isValid1_spl_[ivtx] = v->isValid();
        isFake1_spl_[ivtx] = v->isFake();       
        recx1_spl_[ivtx] = v->x();
        recy1_spl_[ivtx] = v->y();
        recz1_spl_[ivtx] = v->z();
        recx1_err_spl_[ivtx] = v->xError();
        recy1_err_spl_[ivtx] = v->yError();
        recz1_err_spl_[ivtx] = v->zError();

      }
      if(datatype == 2) {
        nTrkPV2_spl_[ivtx] = v->tracksSize();   
        sumptsq2_spl_[ivtx] = sumPtSquared(*v);         
        isValid2_spl_[ivtx] = v->isValid();
        isFake2_spl_[ivtx] = v->isFake();
        recx2_spl_[ivtx] = v->x();
        recy2_spl_[ivtx] = v->y();
        recz2_spl_[ivtx] = v->z();
        recx2_err_spl_[ivtx] = v->xError();
        recy2_err_spl_[ivtx] = v->yError();
        recz2_err_spl_[ivtx] = v->zError();
      }
      if(datatype == 4) { // for pixelVertices
        nTrkPV_pxlpvtx_[ivtx] = v->tracksSize();        
        sumptsq_pxlpvtx_[ivtx] = sumPtSquared(*v);      
        isValid_pxlpvtx_[ivtx] = v->isValid();
        isFake_pxlpvtx_[ivtx] = v->isFake();
        recx_pxlpvtx_[ivtx] = v->x();
        recy_pxlpvtx_[ivtx] = v->y();
        recz_pxlpvtx_[ivtx] = v->z();
        recx_err_pxlpvtx_[ivtx] = v->xError();
        recy_err_pxlpvtx_[ivtx] = v->yError();
        recz_err_pxlpvtx_[ivtx] = v->zError();
      }
    }
  }
  // For histogram only fill the leading pvtx parameters
  if(fillHisto) { 
    h_pvtrk->Fill1d("nTrkPV"+suffix, vertexColl->begin()->tracksSize());
    try {
      for(reco::Vertex::trackRef_iterator t = vertexColl->begin()->tracks_begin(); 
          t!=vertexColl->begin()->tracks_end(); t++) {
        // illegal charge
        if ( (**t).charge() < -1 || (**t).charge() > 1 ) {
          //      h_pvtrk->Fill1d("trkPtPV", 0.);
        }
        else {
          h_pvtrk->Fill1d("trkPtPV"+suffix, (**t).pt());
          h_pvtrk->Fill1d("trkDxyPV"+suffix, (**t).dxy());
          h_pvtrk->Fill1d("trkDzPV"+suffix, (**t).dz());
          h_pvtrk->Fill1d("trkEtaPV"+suffix, (**t).eta());
          h_pvtrk->Fill1d("trkPhiPV"+suffix, (**t).phi());
        }
      }
    }
    catch (...) {
      // exception thrown when trying to use linked track
      //          h_pvtrk->Fill1d("trkPtPV", 0.);
    }
  }
  
}

void PVStudy::fillMCHisto(std::vector<simPrimaryVertex>::iterator vsim, int isimpv, const reco::VertexCollection *vtxColl, int datatype) 
{
  std::string suffix;
  // Set the vertexColl and histogram suffix according to datamode
  if (datatype == 1) {
    suffix = "_spl1_mct";
    nrecPV_spl1_mct_ = 0;   
  }
  if (datatype == 2) {
    suffix = "_spl2_mct";
    nrecPV_spl2_mct_ = 0;     
  } 
  if (datatype == 3) {
    suffix = "_mct"; 
    nrecPV_mct_ = 0;   
  }
  
  //========================================================
  //  look for a matching reconstructed vertex in vertexColl
  //========================================================        
 
  for(reco::VertexCollection::const_iterator vrec=vtxColl->begin(); 
      vrec!=vtxColl->end(); ++vrec){
    int nrectrk = vrec->tracksSize(); 
    vsim->recVtx=NULL;  
   
    edm::LogInfo("Debug") << "[fillMCHisto] sim primary vertex x = " << vsim->x << "; y = " << vsim->y << "; z = " << vsim->z <<  endl;
    edm::LogInfo("Debug") << "[fillMCHisto] Is matched? " << (matchVertex(*vsim,*vrec)?"Yes":"No") << endl;

    if ( matchVertex(*vsim,*vrec) && vrec->isValid() && !vrec->isFake() ) {
      vsim->recVtx=&(*vrec);
      
      // if the matching critera are fulfilled, accept the rec-vertex that is closest in z
      //if(    ((vsim->recVtx) && (fabs(vsim->recVtx->position().z()-vsim->z)>fabs(vrec->z()-vsim->z)))
      //|| (!vsim->recVtx) )
      //vsim->recVtx=&(*vrec);
      //}
      edm::LogInfo("Debug") <<"[fillMCHisto] primary matched in vertexColl" << vsim->x << " " << vsim->y << " " << vsim->z <<  endl;
      
      double fres_mct[3];
      double ferror_mct[3];
      
      fres_mct[0] = vsim->recVtx->x()-vsim->x;
      fres_mct[1] = vsim->recVtx->y()-vsim->y;
      fres_mct[2] = vsim->recVtx->z()-vsim->z;
      ferror_mct[0] = vsim->recVtx->xError();
      ferror_mct[1] = vsim->recVtx->yError();
      ferror_mct[2] = vsim->recVtx->zError();
      
      h_summary->Fill1d("deltax"+suffix, fres_mct[0] );
      h_summary->Fill1d("deltay"+suffix, fres_mct[1] );
      h_summary->Fill1d("deltaz"+suffix, fres_mct[2] );
      h_summary->Fill1d("pullx"+suffix, fres_mct[0]/ferror_mct[0] );
      h_summary->Fill1d("pully"+suffix, fres_mct[1]/ferror_mct[1] );
      h_summary->Fill1d("pullz"+suffix, fres_mct[2]/ferror_mct[2] );
      h_summary->Fill1d("errPVx"+suffix, ferror_mct[0] );
      h_summary->Fill1d("errPVy"+suffix, ferror_mct[1] );
      h_summary->Fill1d("errPVz"+suffix, ferror_mct[2] );
      pvinfo.push_back(PVStudy::PVInfo(res(fres_mct[0], fres_mct[1], fres_mct[2]),
                                       error(ferror_mct[0], ferror_mct[1], ferror_mct[2]),
                                       nrectrk));
      // Fill histo according to its track multiplicity
      fillHisto(res(fres_mct[0], fres_mct[1], fres_mct[2]),
                error(ferror_mct[0], ferror_mct[1], ferror_mct[2]),
                nrectrk, datatype);
      
      if(saventuple_) {
        //Fill the values for variables in ftree_   
        if(datatype == 1) { 
          nTrkPV_spl1_mct_[nrecPV_spl1_mct_] =   nrectrk;
          deltax_spl1_mct_[nrecPV_spl1_mct_] =  fres_mct[0]; 
          deltay_spl1_mct_[nrecPV_spl1_mct_] =  fres_mct[0]; 
          deltaz_spl1_mct_[nrecPV_spl1_mct_] =  fres_mct[0]; 
          pullx_spl1_mct_[nrecPV_spl1_mct_] = fres_mct[0]/ferror_mct[0];  
          pully_spl1_mct_[nrecPV_spl1_mct_] = fres_mct[1]/ferror_mct[1];
          pullz_spl1_mct_[nrecPV_spl1_mct_] =  fres_mct[2]/ferror_mct[2]; 
          nrecPV_spl1_mct_++;
        }
        
        if(datatype == 2) { 
          nTrkPV_spl2_mct_[nrecPV_spl2_mct_] = nrectrk;
          deltax_spl2_mct_[nrecPV_spl2_mct_] =  fres_mct[0]; 
          deltay_spl2_mct_[nrecPV_spl2_mct_] =  fres_mct[0]; 
          deltaz_spl2_mct_[nrecPV_spl2_mct_] =  fres_mct[0]; 
          pullx_spl2_mct_[nrecPV_spl2_mct_] = fres_mct[0]/ferror_mct[0];  
          pully_spl2_mct_[nrecPV_spl2_mct_] = fres_mct[1]/ferror_mct[1];
          pullz_spl2_mct_[nrecPV_spl2_mct_] =  fres_mct[2]/ferror_mct[2]; 
          nrecPV_spl2_mct_++;
        }
        if(datatype == 3) {     
          nTrkPV_mct_[nrecPV_mct_] = nrectrk;
          deltax_mct_[nrecPV_mct_] =  fres_mct[0]; 
          deltay_mct_[nrecPV_mct_] =  fres_mct[0]; 
          deltaz_mct_[nrecPV_mct_] =  fres_mct[0]; 
          pullx_mct_[nrecPV_mct_] = fres_mct[0]/ferror_mct[0];  
          pully_mct_[nrecPV_mct_] = fres_mct[1]/ferror_mct[1];
          pullz_mct_[nrecPV_mct_] =  fres_mct[2]/ferror_mct[2];           
          nrecPV_mct_++;
        }
      } // End of  if(saventuple_) {
    } //  if ( matchVertex(*vsim,*vrec) ) {
    else {  // no rec vertex found for this simvertex
      edm::LogInfo("Debug") <<"[fillMCHisto] primary not found " << vsim->x << " " << vsim->y << " " << vsim->z << " nGenTrk=" << vsim->nGenTrk << endl;
    }
  }
}


void PVStudy::SetVarToZero() {
  //Greg's variables
  fntrk_ = 0;
  //pvtx position (x,y,z) residual and error
  for(int i = 0; i<3;i++)    {
    fres_[i] = 0;
    ferror_[i] = 0;
  }
  
  //Yanyan's variables
  // Number of reconstructed vertices  
  nrecPV_ = 0;
  nrecPV1_spl_ = 0; 
  nrecPV2_spl_ = 0;
  nrecPV_twovtx_ = 0;
  nsimPV_ = 0;

  nrecPV_mct_ = 0;
  nrecPV_spl1_mct_ = 0;
  nrecPV_spl2_mct_ = 0;

  // Mininum separation between the secondary pvtxes and leading pvtx
  min_zsep_ = 9999.0;
  min_ntrksep_ = 9999.0;
  min_sumpt2sep_ = -9999.0;
  

  for (int i = 0; i < nMaxPVs_; i++) {
    // recoVertices with all tracks
    nTrkPV_[i] = 0; // Number of tracks in the pvtx    
    sumptsq_[i] = 0;
    isValid_[i] = -1;
    isFake_[i] = -1; 
    recx_[i] = 0;
    recy_[i] = 0;
    recz_[i] = 0;
    recx_err_[i] = 0;
    recy_err_[i] = 0;
    recz_err_[i] = 0;
    
    // recoVertices with splitTrack1
    nTrkPV1_spl_[i] = 0; // Number of tracks in the pvtx    
    sumptsq1_spl_[i] = 0;
    isValid1_spl_[i] = -1;
    isFake1_spl_[i] = -1; 
    recx1_spl_[i] = 0;
    recy1_spl_[i] = 0;
    recz1_spl_[i] = 0;
    recx1_err_spl_[i] = 0;
    recy1_err_spl_[i] = 0;
    recz1_err_spl_[i] = 0;
  
    // recoVertices with splitTrack2
    nTrkPV2_spl_[i] = 0; // Number of tracks in the pvtx   
    sumptsq2_spl_[i] = 0;
    isValid2_spl_[i] = -1;
    isFake2_spl_[i] = -1; 
    recx2_spl_[i] = 0;
    recy2_spl_[i] = 0;
    recz2_spl_[i] = 0;
    recx2_err_spl_[i] = 0;
    recy2_err_spl_[i] = 0;
    recz2_err_spl_[i] = 0;
    
    //pixelVertices
    nTrkPV_pxlpvtx_[i] = 0; // Number of tracks in the pvtx   
    sumptsq_pxlpvtx_[i] = 0;
    isValid_pxlpvtx_[i] = -1;
    isFake_pxlpvtx_[i] = -1; 
    recx_pxlpvtx_[i] = 0;
    recy_pxlpvtx_[i] = 0;
    recz_pxlpvtx_[i] = 0;
    recx_err_pxlpvtx_[i] = 0;
    recy_err_pxlpvtx_[i] = 0;
    recz_err_pxlpvtx_[i] = 0;

    // matched two-vertices 
    nTrkPV1_spl_twovtx_[i] = 0;
    nTrkPV2_spl_twovtx_[i] = 0;
    nTrkPV_twovtx_[i] = 0;  
    sumptsq1_spl_twovtx_[i] = 0; // Sum of pT squred in the pvtx
    sumptsq2_spl_twovtx_[i] = 0; // Sum of pT squred in the pvtx
    deltax_twovtx_[i] = 0;
    deltay_twovtx_[i] = 0;
    deltaz_twovtx_[i] = 0;
    errx_twovtx_[i] = 0;
    erry_twovtx_[i] = 0;
    errz_twovtx_[i] = 0;
    pullx_twovtx_[i] = 0;
    pully_twovtx_[i] = 0;
    pullz_twovtx_[i] = 0;
    
    //simpv 
    nsimTrkPV_[i] = 0; 
    simx_[i] = 0;
    simy_[i] = 0;
    simz_[i] = 0;
    simptsq_[i] = 0;
    
    // residual and pulls with mc truth required
    deltax_mct_[i] = 0;
    deltay_mct_[i] = 0;
    deltaz_mct_[i] = 0;
    pullx_mct_[i] = 0;
    pully_mct_[i] = 0;
    pullz_mct_[i] = 0;
        
    deltax_spl1_mct_[i] = 0;
    deltay_spl1_mct_[i] = 0;
    deltaz_spl1_mct_[i] = 0;
    pullx_spl1_mct_[i] = 0;
    pully_spl1_mct_[i] = 0;
    pullz_spl1_mct_[i] = 0;
    
    deltax_spl2_mct_[i] = 0;
    deltay_spl2_mct_[i] = 0;
    deltaz_spl2_mct_[i] = 0;
    pullx_spl2_mct_[i] = 0;
    pully_spl2_mct_[i] = 0;
    pullz_spl2_mct_[i] = 0;
  }
  
}

double PVStudy::sumPtSquared(const reco::Vertex & v)  {
  double sum = 0.;
  double pT;
  for (reco::Vertex::trackRef_iterator it = v.tracks_begin(); it != v.tracks_end(); it++) {
    pT = (**it).pt();
    sum += pT*pT;
  }
  return sum;
}

Revision:	1.14
Committed:	Fri Dec 4 20:48:04 2009 UTC (15 years, 5 months ago) by jengbou
Content type:	text/plain
Branch:	MAIN
Changes since 1.13:	+86 -108 lines
Log Message:	bug fix