#include <ConversionVertexFinder.h>

Public Member Functions
	ConversionVertexFinder (const edm::ParameterSet &config)

TransientVertex	run (std::vector< reco::TransientTrack > pair)

bool	run (std::vector< reco::TransientTrack > pair, reco::Vertex &the_vertex)

	~ConversionVertexFinder ()

Private Attributes
edm::ParameterSet	conf_

KinematicConstrainedVertexFitter *	kcvFitter_

double	maxDelta_

int	maxNbrOfIterations_

double	maxReducedChiSq_

double	minChiSqImprovement_

Detailed Description

Author: N. Marinelli - Univ. of Notre Dame

Version

Definition at line 29 of file ConversionVertexFinder.h.

Constructor & Destructor Documentation

ConversionVertexFinder::ConversionVertexFinder ( const edm::ParameterSet & config )

Definition at line 25 of file ConversionVertexFinder.cc.

References conf_, edm::ParameterSet::getParameter(), kcvFitter_, LogDebug, maxDelta_, maxNbrOfIterations_, maxReducedChiSq_, and minChiSqImprovement_.

                                                                             :
   conf_(config)
 { 
   LogDebug("ConversionVertexFinder") << "ConversionVertexFinder CTOR  " <<  "\n";  
   maxDelta_ = conf_.getParameter<double>("maxDelta");
   maxReducedChiSq_ = conf_.getParameter<double>("maxReducedChiSq");
   minChiSqImprovement_  = conf_.getParameter<double>("minChiSqImprovement");
   maxNbrOfIterations_ = conf_.getParameter<int>("maxNbrOfIterations");
   kcvFitter_ = new KinematicConstrainedVertexFitter();
   kcvFitter_->setParameters(conf_);
 
 }

ConversionVertexFinder::~ConversionVertexFinder ( )

Definition at line 38 of file ConversionVertexFinder.cc.

References kcvFitter_, and LogDebug.

                                                 {
 
   LogDebug("ConversionVertexFinder") << "ConversionVertexFinder DTOR " <<  "\n";  
   delete   kcvFitter_;
  
 }

Member Function Documentation

TransientVertex ConversionVertexFinder::run ( std::vector< reco::TransientTrack > pair )

Definition at line 141 of file ConversionVertexFinder.cc.

References alignCSCRings::e, cms::Exception::explainSelf(), LogDebug, metname, and KalmanVertexFitter::vertex().

Referenced by ConvertedPhotonProducer::buildCollections(), and ConversionProducer::checkVertex().

                                                                                 {
   LogDebug("ConversionVertexFinder") << "ConversionVertexFinder run pair size " << pair.size() <<  "\n";  
   
   //for ( std::vector<reco::TransientTrack>::const_iterator iTk=pair.begin(); iTk!=pair.end(); ++iTk) {
   // LogDebug("ConversionVertexFinder") << "  ConversionVertexFinder  Tracks in the pair  charge " << iTk->charge() << " Num of RecHits " << iTk->recHitsSize() << " inner momentum " << iTk->track().innerMomentum() << "\n";  
   //}
 
   reco::Vertex theVertex;  
   KalmanVertexFitter fitter(true);
   TransientVertex transientVtx;
 
   const std::string metname =  "ConversionVertexFinder| ConversionVertexFinder";
   try{
 
     transientVtx = fitter.vertex(pair); 
 
   }  catch ( cms::Exception& e ) {
 
     edm::LogWarning(metname) << "cms::Exception caught in ConversionVertexFinder::run\n"
                  << e.explainSelf();
     
   }
   
   return transientVtx;
 
 }

bool ConversionVertexFinder::run	(	std::vector< reco::TransientTrack >	pair,
		reco::Vertex &	the_vertex
	)

Definition at line 45 of file ConversionVertexFinder.cc.

References ChiSquaredProbability(), conf_, gather_cfg::cout, KinematicConstrainedVertexFitter::fit(), KinematicConstrainedVertexFitterT< nTrk, nConstraint >::fit(), newFWLiteAna::found, KinematicConstrainedVertexFitter::getNit(), KinematicConstrainedVertexFitterT< nTrk, nConstraint >::getNit(), kcvFitter_, GetRecoTauVFromDQM_MC_cff::kk, scaleCards::mass, KinematicParticleFactoryFromTransientTrack::particle(), ColinearityKinematicConstraint::PhiTheta, and KinematicConstrainedVertexFitterT< nTrk, nConstraint >::setParameters().

                                                                                              {
   bool found= false;
 
   if ( pair.size() < 2) return found;
   
   float sigma = 0.00000001;
   float chi = 0.;
   float ndf = 0.;
   float mass = 0.000511;
   
 
   KinematicParticleFactoryFromTransientTrack pFactory;
   
   std::vector<RefCountedKinematicParticle> particles;
   
   particles.push_back(pFactory.particle (pair[0],mass,chi,ndf,sigma,*pair[0].innermostMeasurementState().freeState()));
   particles.push_back(pFactory.particle (pair[1],mass,chi,ndf,sigma,*pair[1].innermostMeasurementState().freeState()));
   
 
 #ifdef OldKineFit
   ColinearityKinematicConstraint constr(ColinearityKinematicConstraint::PhiTheta);
   
   RefCountedKinematicTree myTree = kcvFitter_->fit(particles, &constr);
 #else
 
   // bizzare way to the get the field...
   const MagneticField* mf = pair[0].field();
 
   ColinearityKinematicConstraintT<colinearityKinematic::PhiTheta> constr;
   KinematicConstrainedVertexFitterT<2,2> kcvFitter(mf);
   kcvFitter.setParameters(conf_);
   RefCountedKinematicTree myTree =  kcvFitter.fit(particles, &constr);
 
 #ifdef KineFitDebug
 
   ColinearityKinematicConstraint oldconstr(ColinearityKinematicConstraint::PhiTheta);
   
   RefCountedKinematicTree oldTree = kcvFitter_->fit(particles, &oldconstr);
 
 
   if( oldTree->isValid() ) {
     std::cout << "old " << kcvFitter_->getNit() << std::endl;
     RefCountedKinematicVertex gamma_dec_vertex = oldTree->currentDecayVertex();                                                          
     if( gamma_dec_vertex->vertexIsValid())
       std::cout << gamma_dec_vertex->chiSquared() <<  " " << gamma_dec_vertex->degreesOfFreedom() << std::endl;
     std::cout <<  oldTree->currentParticle()->currentState().globalMomentum() <<
       oldTree->currentParticle()->currentState().globalPosition()<< std::endl;
     std::vector<RefCountedKinematicParticle> fStates=oldTree->finalStateParticles();
     for (unsigned int kk=0; kk<fStates.size(); kk++) {
       std::cout <<  fStates[kk]->currentState().globalMomentum() << 
     fStates[kk]->currentState().globalPosition() << std::endl;
       std::cout <<  fStates[kk]->currentState().kinematicParametersError().matrix()<<std::endl;
     }
   } else       std::cout << "old invalid " << kcvFitter_->getNit() << std::endl;
   
   if( myTree->isValid() ) {
     std::cout << "new " << kcvFitter.getNit() << std::endl;
     RefCountedKinematicVertex gamma_dec_vertex = myTree->currentDecayVertex();                                                          
     if( gamma_dec_vertex->vertexIsValid())
       std::cout << gamma_dec_vertex->chiSquared() <<  " " << gamma_dec_vertex->degreesOfFreedom() << std::endl;
     std::cout <<  myTree->currentParticle()->currentState().globalMomentum() <<
       myTree->currentParticle()->currentState().globalPosition()<< std::endl;
     std::vector<RefCountedKinematicParticle> fStates=myTree->finalStateParticles();
     for (unsigned int kk=0; kk<fStates.size(); kk++) {
       std::cout <<  fStates[kk]->currentState().globalMomentum() << 
     fStates[kk]->currentState().globalPosition() << std::endl;
       std::cout <<  fStates[kk]->currentState().kinematicParametersError().matrix()<<std::endl;
     }
   } else       std::cout << "new invalid " << kcvFitter.getNit() << std::endl;
 
 #endif // TemplateKineFitDebug
 
 #endif
 
   if( myTree->isValid() ) {
     myTree->movePointerToTheTop();                                                                                
     RefCountedKinematicParticle the_photon = myTree->currentParticle();                                           
     if (the_photon->currentState().isValid()){                                                                    
       //const ParticleMass photon_mass = the_photon->currentState().mass();                                       
       RefCountedKinematicVertex gamma_dec_vertex;                                                               
       gamma_dec_vertex = myTree->currentDecayVertex();                                                          
       if( gamma_dec_vertex->vertexIsValid() ){                                                                  
     const float chi2Prob = ChiSquaredProbability(gamma_dec_vertex->chiSquared(), gamma_dec_vertex->degreesOfFreedom());
     if (chi2Prob>0.){// no longer cut here, only ask positive probability here 
       //const math::XYZPoint vtxPos(gamma_dec_vertex->position());                                           
       the_vertex = *gamma_dec_vertex;
       found = true;
     }
       }
     }
   }
  
   return found;
 }