/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Validation/RecoVertex/src/TrackParameterAnalyzer.cc

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#include "Validation/RecoVertex/interface/TrackParameterAnalyzer.h"
#include <string>
#include <vector>
#include "FWCore/Version/interface/GetReleaseVersion.h"
#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"

//
//
// constants, enums and typedefs
//

//
// static data member definitions
//

//
// constructors and destructor
//
TrackParameterAnalyzer::TrackParameterAnalyzer(const edm::ParameterSet& iConfig) :
  simG4_( iConfig.getParameter<edm::InputTag>( "simG4" ) ) {
   //now do whatever initialization is needed

  recoTrackProducer_   = iConfig.getUntrackedParameter<std::string>("recoTrackProducer");
  // open output file to store histograms}
  outputFile_   = iConfig.getUntrackedParameter<std::string>("outputFile");
  TString tversion(edm::getReleaseVersion());
  tversion = tversion.Remove(0,1);
  tversion = tversion.Remove(tversion.Length()-1,tversion.Length());
  outputFile_  = std::string(tversion)+"_"+outputFile_;

  rootFile_ = TFile::Open(outputFile_.c_str(),"RECREATE"); 
  verbose_= iConfig.getUntrackedParameter<bool>("verbose", false);
  simUnit_=1.0;  //  starting from  CMSSW_1_2_x, I think
  if ( (edm::getReleaseVersion()).find("CMSSW_1_1_",0)!=std::string::npos){
    simUnit_=0.1;  // for use in  CMSSW_1_1_1 tutorial
  }
}


TrackParameterAnalyzer::~TrackParameterAnalyzer()
{
 
   // do anything here that needs to be done at destruction time
   // (e.g. close files, deallocate resources etc.)
  delete rootFile_;
}



//
// member functions
//
void TrackParameterAnalyzer::beginJob(){
  std::cout << " TrackParameterAnalyzer::beginJob  conversion from sim units to rec units is " << simUnit_ << std::endl;

  rootFile_->cd();
  h1_pull0_ = new TH1F("pull0","pull q/p",100,-25.,25.);
  h1_pull1_ = new TH1F("pull1","pull lambda",100,-25.,25.);
  h1_pull2_ = new TH1F("pull2","pull phi  ",100,-25.,25.);
  h1_pull3_ = new TH1F("pull3","pull dca  ",100,-25.,25.);
  h1_pull4_ = new TH1F("pull4","pull zdca ",100,-25.,25.);

  h1_res0_ = new TH1F("res0","res q/p",100,-0.1,0.1);
  h1_res1_ = new TH1F("res1","res lambda",100,-0.1,0.1);
  h1_res2_ = new TH1F("res2","res phi  ",100,-0.1,0.1);
  h1_res3_ = new TH1F("res3","res dca  ",100,-0.1,0.1);
  h1_res4_ = new TH1F("res4","res zdca ",100,-0.1,0.1);

  h1_Beff_  = new TH1F("Beff", "Beff",2000,-10.,10.);
  h2_dvsphi_ = new TH2F("dvsphi","dvsphi",360,-M_PI,M_PI,100,-0.1,0.1);
  h1_par0_ = new TH1F("par0","q/p",100,-0.1,0.1);
  h1_par1_ = new TH1F("par1","lambda",100, -M_PI/2.,M_PI/2.);
  h1_par2_ = new TH1F("par2","phi  ",100,-M_PI,M_PI);
  h1_par3_ = new TH1F("par3","dca  ",100,-0.1,0.1);
  h1_par4_ = new TH1F("par4","zdca ",1000,-10.,10.);
}


void TrackParameterAnalyzer::endJob() {
  rootFile_->cd();
  h1_pull0_->Write();
  h1_pull1_->Write();
  h1_pull2_->Write();
  h1_pull3_->Write();
  h1_pull4_->Write();

  h1_res0_->Write();
  h1_res1_->Write();
  h1_res2_->Write();
  h1_res3_->Write();
  h1_res4_->Write();

  h1_Beff_->Write();
  h2_dvsphi_->Write();
  h1_par0_->Write();
  h1_par1_->Write();
  h1_par2_->Write();
  h1_par3_->Write();
  h1_par4_->Write();
}

// helper function
bool TrackParameterAnalyzer::match(const ParameterVector  &a, 
                                   const ParameterVector  &b){
  double dtheta=a(1)-b(1);
  double dphi  =a(2)-b(2);
  if (dphi>M_PI){ dphi-=M_2_PI; }else if(dphi<-M_PI){dphi+=M_2_PI;}
  return ( (fabs(dtheta)<0.02) && (fabs(dphi)<0.04) );
}

// ------------ method called to produce the data  ------------
void
TrackParameterAnalyzer::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   using namespace edm;
   using CLHEP::HepLorentzVector;

   //edm::ESHandle<TransientTrackBuilder> theB;
   //iSetup.get<TransientTrackRecord>().get("TransientTrackBuilder",theB);
   //double fBfield=((*theB).field()->inTesla(GlobalPoint(0.,0.,0.))).z();
   const double fBfield=3.8;
  
   Handle<edm::SimVertexContainer> simVtcs;
   iEvent.getByLabel( simG4_, simVtcs);
   if(verbose_){
     std::cout << "SimVertex " << simVtcs->size() << std::endl;
     for(edm::SimVertexContainer::const_iterator v=simVtcs->begin();
         v!=simVtcs->end(); ++v){
       std::cout << "simvtx "
                 << std::setw(10) << std::setprecision(4)
                 << v->position().x() << " "
                 << v->position().y() << " "
                 << v->position().z() << " "
                 << v->parentIndex() << " "
                 << v->noParent() << " "
                 << std::endl;
     }
   }
   
   // get the simulated tracks, extract perigee parameters
   Handle<SimTrackContainer> simTrks;
   iEvent.getByLabel( simG4_, simTrks);
   
   if(verbose_){std::cout << "simtrks " << simTrks->size() << std::endl;}
   std::vector<ParameterVector > tsim;
   for(edm::SimTrackContainer::const_iterator t=simTrks->begin();
       t!=simTrks->end(); ++t){
     if (t->noVertex()){
       std::cout << "simtrk  has no vertex" << std::endl;
       return;
     }else{
       // get the vertex position
       HepLorentzVector v((*simVtcs)[t->vertIndex()].position().x(),
                          (*simVtcs)[t->vertIndex()].position().y(),
                          (*simVtcs)[t->vertIndex()].position().z(),
                          (*simVtcs)[t->vertIndex()].position().e());
       int pdgCode=t->type();

       if( pdgCode==-99 ){
         // such entries cause crashes, no idea what they are
         std::cout << "funny particle skipped  , code="  << pdgCode << std::endl;
       }else{
         double Q=0; //double Q=HepPDT::theTable().getParticleData(pdgCode)->charge();
         if ((pdgCode==11)||(pdgCode==13)||(pdgCode==15)||(pdgCode==-211)||(pdgCode==-2212)||(pdgCode==321)){Q=-1;}
         else if((pdgCode==-11)||(pdgCode==-13)||(pdgCode==-15)||(pdgCode==211)||(pdgCode==2212)||(pdgCode==321)){Q=1;}
         else {
           std::cout << pdgCode << " " <<std::endl;
         }
         HepLorentzVector p(t->momentum().x(),t->momentum().y(),t->momentum().z(),t->momentum().e());
         if(verbose_){
           std::cout << "simtrk "
                       << " gen=" << std::setw( 4) << t->genpartIndex()
                       << " vtx=" << std::setw( 4) << t->vertIndex() 
                       << " pdg=" << std::setw( 5) << t->type() 
                       << " Q="   << std::setw( 3) << Q 
                       << " pt="  << std::setw(6) << p.perp()
                       << " vx="  << std::setw(6) << v.x() 
                       << " vy="  << std::setw(6) << v.y() 
                       << " vz="  << std::setw(6) << v.z()
                       << std::endl;
         }
         if ( (Q != 0) && (p.perp()>0.1) ){
           double x0=v.x()*simUnit_;
           double y0=v.y()*simUnit_;
           double z0=v.z()*simUnit_;
           double kappa=-Q*0.002998*fBfield/p.perp();
           double D0=x0*sin(p.phi())-y0*cos(p.phi())-0.5*kappa*(x0*x0+y0*y0);
           double q=sqrt(1.-2.*kappa*D0);
           double s0=(x0*cos(p.phi())+y0*sin(p.phi()))/q;
           double s1;
           if (fabs(kappa*s0)>0.001){
             s1=asin(kappa*s0)/kappa;
           }else{
             double ks02=(kappa*s0)*(kappa*s0);
             s1=s0*(1.+ks02/6.+3./40.*ks02*ks02+5./112.*pow(ks02,3));
           }
           ParameterVector par;
           par[reco::TrackBase::i_qoverp] = Q/sqrt(p.perp2()+p.pz()*p.pz());
           par[reco::TrackBase::i_lambda] = M_PI/2.-p.theta();
           par[reco::TrackBase::i_phi] = p.phi()-asin(kappa*s0);
           par[reco::TrackBase::i_dxy] = 2.*D0/(1.+q);
           par[reco::TrackBase::i_dsz] = z0*sin(p.theta())-s1*cos(p.theta());
           tsim.push_back(par);
         }
       }
     }// has vertex
   }//for loop
   
   // simtrack parameters are in now tsim
   // loop over tracks and try to match them to simulated tracks


   Handle<reco::TrackCollection> recTracks;
   iEvent.getByLabel(recoTrackProducer_, recTracks);

   for(reco::TrackCollection::const_iterator t=recTracks->begin();
       t!=recTracks->end(); ++t){
     reco::TrackBase::ParameterVector  p = t->parameters();
     reco::TrackBase::CovarianceMatrix c = t->covariance();
     if(verbose_){
       std::cout << "reco pars= " << p << std::endl;
       //std::cout << "z0=" << p(4) << std::endl;
     }
     for(std::vector<ParameterVector>::const_iterator s=tsim.begin();
         s!=tsim.end(); ++s){
       if (match(*s,p)){
         //if(verbose_){ std::cout << "match found" << std::endl;}
         h1_pull0_->Fill((p(0)-(*s)(0))/sqrt(c(0,0)));
         h1_pull1_->Fill((p(1)-(*s)(1))/sqrt(c(1,1)));
         h1_pull2_->Fill((p(2)-(*s)(2))/sqrt(c(2,2)));
         h1_pull3_->Fill((p(3)-(*s)(3))/sqrt(c(3,3)));
         h1_pull4_->Fill((p(4)-(*s)(4))/sqrt(c(4,4)));

         h1_res0_->Fill(p(0)-(*s)(0));
         h1_res1_->Fill(p(1)-(*s)(1));
         h1_res2_->Fill(p(2)-(*s)(2));
         h1_res3_->Fill(p(3)-(*s)(3));
         h1_res4_->Fill(p(4)-(*s)(4));

         h1_Beff_->Fill(p(0)/(*s)(0)*fBfield);
         h2_dvsphi_->Fill(p(2),p(3));
         h1_par0_->Fill(p(0));
         h1_par1_->Fill(p(1));
         h1_par2_->Fill(p(2));
         h1_par3_->Fill(p(3));
         h1_par4_->Fill(p(4));
      }
     }
   }




}