HepMCValidationHelper Namespace Reference

Functions
void	allStatus1 (const HepMC::GenEvent *all, std::vector< const HepMC::GenParticle * > &status1)
void	allStatus2 (const HepMC::GenEvent *all, std::vector< const HepMC::GenParticle * > &status2)
void	allStatus3 (const HepMC::GenEvent *all, std::vector< const HepMC::GenParticle * > &status3)
void	allVisibleParticles (const HepMC::GenEvent *all, std::vector< const HepMC::GenParticle * > &visible)
void	findDescendents (const HepMC::GenParticle *a, std::vector< const HepMC::GenParticle * > &descendents)
void	findFSRPhotons (const std::vector< const HepMC::GenParticle * > &leptons, const std::vector< const HepMC::GenParticle * > &all, double deltaR, std::vector< const HepMC::GenParticle * > &photons)
void	findFSRPhotons (const std::vector< const HepMC::GenParticle * > &leptons, const HepMC::GenEvent *all, double deltaR, std::vector< const HepMC::GenParticle * > &photons)
TLorentzVector	genMet (const HepMC::GenEvent *all, double etamin=-9999., double etamax=9999.)
template<class T >
bool	GreaterByE (const T &a1, const T &a2)
bool	isChargedLepton (const HepMC::GenParticle *part)
bool	isNeutrino (const HepMC::GenParticle *part)
bool	isTau (const HepMC::GenParticle *part)
void	removeIsolatedLeptons (const HepMC::GenEvent *all, double deltaR, double sumPt, std::vector< const HepMC::GenParticle * > &pruned)
bool	sortByE (const HepMC::GenParticle *a, const HepMC::GenParticle *b)
bool	sortByPseudoRapidity (const HepMC::GenParticle *a, const HepMC::GenParticle *b)
bool	sortByPt (const HepMC::GenParticle *a, const HepMC::GenParticle *b)
bool	sortByRapidity (const HepMC::GenParticle *a, const HepMC::GenParticle *b)

Function Documentation

void HepMCValidationHelper::allStatus1	(	const HepMC::GenEvent *	all,
		std::vector< const HepMC::GenParticle * > &	status1
	)

Definition at line 72 of file HepMCValidationHelper.cc.

Referenced by allVisibleParticles(), MBUEandQCDValidation::analyze(), findFSRPhotons(), removeIsolatedLeptons(), and sortByPseudoRapidity().

                                                                                        {
    for (HepMC::GenEvent::particle_const_iterator iter = all->particles_begin(); iter != all->particles_end(); ++iter){
      if ((*iter)->status() == 1) status1.push_back(*iter);
    }
  }

void HepMCValidationHelper::allStatus2	(	const HepMC::GenEvent *	all,
		std::vector< const HepMC::GenParticle * > &	status2
	)

Definition at line 78 of file HepMCValidationHelper.cc.

Referenced by removeIsolatedLeptons(), and sortByPseudoRapidity().

                                                                                        {
    for (HepMC::GenEvent::particle_const_iterator iter = all->particles_begin(); iter != all->particles_end(); ++iter){
      if ((*iter)->status() == 2) status1.push_back(*iter);
    }
  }

void HepMCValidationHelper::allStatus3	(	const HepMC::GenEvent *	all,
		std::vector< const HepMC::GenParticle * > &	status3
	)

Definition at line 84 of file HepMCValidationHelper.cc.

Referenced by sortByPseudoRapidity().

                                                                                        {
    for (HepMC::GenEvent::particle_const_iterator iter = all->particles_begin(); iter != all->particles_end(); ++iter){
      if ((*iter)->status() == 3) status1.push_back(*iter);
    }
  }

void HepMCValidationHelper::allVisibleParticles	(	const HepMC::GenEvent *	all,
		std::vector< const HepMC::GenParticle * > &	visible
	)

Definition at line 248 of file HepMCValidationHelper.cc.

References allStatus1(), mps_fire::i, and isNeutrino().

Referenced by genMet(), and sortByPseudoRapidity().

                                                                                                   {
    std::vector<const HepMC::GenParticle*> status1;
    visible.clear();    
    allStatus1(all, status1);
    for (unsigned int i = 0; i < status1.size(); ++i){
      if (!isNeutrino(status1[i])) visible.push_back(status1[i]);
    }    
  }

void HepMCValidationHelper::findDescendents	(	const HepMC::GenParticle *	a,
		std::vector< const HepMC::GenParticle * > &	descendents
	)

Definition at line 90 of file HepMCValidationHelper.cc.

Referenced by removeIsolatedLeptons(), and sortByPseudoRapidity().

                                                                                                  {
    HepMC::GenVertex* decayVertex = a->end_vertex();
    if (!decayVertex) return;
    HepMC::GenVertex::particles_out_const_iterator ipart;
    for (ipart = decayVertex->particles_out_const_begin(); ipart != decayVertex->particles_out_const_end(); ++ipart ){
      if ((*ipart)->status() == 1) descendents.push_back(*ipart);
      else findDescendents(*ipart, descendents);
    }
  }

void HepMCValidationHelper::findFSRPhotons	(	const std::vector< const HepMC::GenParticle * > &	leptons,
		const std::vector< const HepMC::GenParticle * > &	all,
		double	deltaR,
		std::vector< const HepMC::GenParticle * > &	photons
	)

Definition at line 21 of file HepMCValidationHelper.cc.

References deltaR(), mps_fire::i, and mps_update::status.

Referenced by WValidation::analyze(), DrellYanValidation::analyze(), findFSRPhotons(), removeIsolatedLeptons(), and sortByPseudoRapidity().

                                                                     {
                        
    //find all status 1 photons
    std::vector<const HepMC::GenParticle*> allphotons;
    for (unsigned int i = 0; i < all.size(); ++i){
      if  (all[i]->status()==1 && all[i]->pdg_id()==22) allphotons.push_back(all[i]);
    }

    //loop over the photons and check the distance wrt the leptons
    for (unsigned int ipho = 0; ipho < allphotons.size(); ++ipho){
      bool close = false;
      for (unsigned int ilep = 0; ilep < leptons.size(); ++ilep){
        if (deltaR(allphotons[ipho]->momentum(), leptons[ilep]->momentum()) < deltaRcut){
          close = true;
          break;
        }  
      }
      if (close) fsrphotons.push_back(allphotons[ipho]);
    }
  }

void HepMCValidationHelper::findFSRPhotons	(	const std::vector< const HepMC::GenParticle * > &	leptons,
		const HepMC::GenEvent *	all,
		double	deltaR,
		std::vector< const HepMC::GenParticle * > &	photons
	)

Definition at line 11 of file HepMCValidationHelper.cc.

References allStatus1(), and findFSRPhotons().

                                                                     {

    std::vector<const HepMC::GenParticle*> status1;
    allStatus1(all, status1);
    findFSRPhotons(leptons, status1, deltaRcut, fsrphotons);
  }

TLorentzVector HepMCValidationHelper::genMet	(	const HepMC::GenEvent *	all,
		double	etamin = -9999.,
		double	etamax = 9999.
	)

Definition at line 258 of file HepMCValidationHelper.cc.

References allVisibleParticles(), mps_fire::i, RazorAnalyzer::met, lumiQTWidget::t, and x().

Referenced by GenSpecificAlgo::addInfo(), WValidation::analyze(), HLTJetMETValidation::analyze(), pat::GenMETExtractor::produce(), HLTTauMCProducer::produce(), l1t::GenToInputProducer::produce(), and sortByPseudoRapidity().

                                                                               {
    std::vector<const HepMC::GenParticle*> visible;
    allVisibleParticles(all, visible);
    TLorentzVector momsum(0., 0., 0., 0.);  
    for (unsigned int i = 0; i < visible.size(); ++i){
      if (visible[i]->momentum().eta() > etamin && visible[i]->momentum().eta() < etamax) {
        TLorentzVector mom(visible[i]->momentum().x(), visible[i]->momentum().y(), visible[i]->momentum().z(), visible[i]->momentum().t()); 
        momsum += mom;  
      }             
    }
    TLorentzVector met(-momsum.Px(), -momsum.Py(), 0., momsum.Pt());    
    return met; 
  }      

template<class T >

bool HepMCValidationHelper::GreaterByE ( const T &  a1, const T &  a2  )

inline

Definition at line 9 of file HepMCValidationHelper.h.

{return a1.E() > a2.E();}

bool HepMCValidationHelper::isChargedLepton

(

const HepMC::GenParticle *

part

)

Definition at line 46 of file HepMCValidationHelper.cc.

References funct::abs(), HiggsValidation_cfi::pdg_id, and mps_update::status.

Referenced by removeIsolatedLeptons(), and sortByPseudoRapidity().

                                                    {
    int status = part->status();
    unsigned int pdg_id = abs(part->pdg_id());
    if (status == 2) return pdg_id == 15;
    else return status == 1 &&  (pdg_id == 11 || pdg_id == 13 ) ;
  }

bool HepMCValidationHelper::isNeutrino

(

const HepMC::GenParticle *

part

)

Definition at line 54 of file HepMCValidationHelper.cc.

References funct::abs(), HiggsValidation_cfi::pdg_id, and mps_update::status.

Referenced by allVisibleParticles(), removeIsolatedLeptons(), and sortByPseudoRapidity().

                                                 {
      int status = part->status();
      unsigned int pdg_id = abs(part->pdg_id());
      return status == 1 &&  (pdg_id == 12 || pdg_id == 14 || pdg_id == 16) ;
  } 

bool HepMCValidationHelper::isTau

(

const HepMC::GenParticle *

part

)

Definition at line 61 of file HepMCValidationHelper.cc.

References funct::abs().

Referenced by removeIsolatedLeptons(), and sortByPseudoRapidity().

                                          {
    return part->status() == 2 && abs(part->pdg_id()) == 15;
  }

void HepMCValidationHelper::removeIsolatedLeptons	(	const HepMC::GenEvent *	all,
		double	deltaR,
		double	sumPt,
		std::vector< const HepMC::GenParticle * > &	pruned
	)

Definition at line 100 of file HepMCValidationHelper.cc.

References allStatus1(), allStatus2(), gather_cfg::cout, deltaR(), findDescendents(), findFSRPhotons(), mps_fire::i, isChargedLepton(), isNeutrino(), isTau(), AK4GenJetFlavourInfos_cfi::leptons, HiggsValidation_cfi::pdg_id, lumiQTWidget::t, jetCleaner_cfi::taus, and x().

Referenced by MBUEandQCDValidation::analyze(), and sortByPseudoRapidity().

                                                                                                                                      {
    //get all status 1 particles
    std::vector<const HepMC::GenParticle*> status1;
    allStatus1(all, status1);
    std::vector<const HepMC::GenParticle*> toRemove;
    //loop on all particles and find candidates to be isolated
    for (unsigned int i = 0; i < status1.size(); ++i){
      //if it is a neutrino is a charged lepton (not a tau) this is a candidate to be isolated
      if (isNeutrino(status1[i]) || (isChargedLepton(status1[i]) && !isTau(status1[i]))){
        //list of particles not to be considered in the isolation computation.
        //this includes the particle to be isolated and the fsr photons in case of charged lepton
        std::vector<const HepMC::GenParticle*> leptons;
        leptons.push_back(status1[i]);
        std::vector<const HepMC::GenParticle*> removedForIsolation;
        removedForIsolation.push_back(status1[i]);
        if (isChargedLepton(status1[i])) findFSRPhotons(leptons, status1, deltaRcut, removedForIsolation);
#ifdef  DEBUG_HepMCValidationHelper
        //std::cout << removedForIsolation.size() << " particles to be removed for isolation calculation " << std::endl;
#endif
        //create vector of particles to compute isolation (removing removedForIsolation);
        std::vector<const HepMC::GenParticle*> forIsolation;
        std::vector<const HepMC::GenParticle*>::iterator iiso;
        for (iiso = status1.begin(); iiso != status1.end(); ++iiso){
          std::vector<const HepMC::GenParticle*>::const_iterator iremove;
          bool marked = false;
          for ( iremove = removedForIsolation.begin(); iremove != removedForIsolation.end(); ++iremove){
            if ((*iiso)->barcode() == (*iremove)->barcode()) {
#ifdef  DEBUG_HepMCValidationHelper
              //std::cout << "removing particle " << **iiso << " from the list of particles to compute isolation" << std::endl;
#endif
              marked = true;  
              break;
            }
          }
          if (!marked) forIsolation.push_back(*iiso);
        }
        //now compute isolation
        double sumIso = 0;
        for (iiso = forIsolation.begin(); iiso < forIsolation.end(); ++iiso){
           if (deltaR(leptons.front()->momentum(), (*iiso)->momentum()) < deltaRcut){
              sumIso += (*iiso)->momentum().perp();
           }
        }
        //if isolated remove from the pruned list
        if (sumIso < sumPtCut) {
#ifdef  DEBUG_HepMCValidationHelper
           std::cout << "particle " <<  *status1[i] <<  " is considered isolated, with sumPt " << sumIso << std::endl; 
#endif
           toRemove.insert(toRemove.end(), removedForIsolation.begin(), removedForIsolation.end()); 
        }
#ifdef  DEBUG_HepMCValidationHelper        
        else {
          std::cout << "NOT isolated! " <<  *status1[i] <<  " is considered not isolated, with sumPt " << sumIso << std::endl;
        }
#endif        
      } 
    }
    //at this point we have taken care of the electrons and muons, but pruned could  still contain the decay products of isolated taus, 
    //we want to remove these as well
    std::vector<const HepMC::GenParticle*> status2;
    allStatus2(all, status2);
    std::vector<const HepMC::GenParticle*> taus;
    //getTaus(all, taus);
    for (unsigned int i = 0; i < status2.size(); ++i){
      if (isTau(status2[i])) {
        //check the list we have already for duplicates
        //there use to be duplicates in some generators (sherpa) 
        bool duplicate = false; 
        TLorentzVector taumomentum(status2[i]->momentum().x(), status2[i]->momentum().y(), status2[i]->momentum().z(), status2[i]->momentum().t());
        for (unsigned int j = 0; j < taus.size(); ++j){
          //compare momenta
          TLorentzVector othermomentum(taus[j]->momentum().x(), taus[j]->momentum().y(), taus[j]->momentum().z(), taus[j]->momentum().t());
          othermomentum-=taumomentum;
          if (status2[i]->pdg_id() == taus[j]->pdg_id() &&
              othermomentum.E() < 0.1 &&//std::numeric_limits<float>::epsilon() &&
              othermomentum.P() < 0.1 ){ //std::numeric_limits<float>::epsilon()){
            duplicate = true;
            break;
          }    
        }
        if (!duplicate) taus.push_back(status2[i]);
      }  
    }
    //loop over the taus, find the descendents, remove all these from the list of particles to compute isolation   
    for (unsigned int i = 0; i < taus.size(); ++i){
      std::vector<const HepMC::GenParticle*> taudaughters;
      findDescendents(taus[i], taudaughters);
      if ( taudaughters.size()<=0 ) {
    edm::LogError("HepMCValidationHelper") << "Tau with no daughters. This is a bug. Fix it";
    abort();
      }
      const HepMC::FourVector& taumom = taus[i]->momentum();
      //remove the daughters from the list of particles to compute isolation
      std::vector<const HepMC::GenParticle*> forIsolation;
      std::vector<const HepMC::GenParticle*>::iterator iiso;
      for (iiso = status1.begin(); iiso < status1.end(); ++iiso){
        bool marked = false;
        std::vector<const HepMC::GenParticle*>::const_iterator iremove;
        for ( iremove = taudaughters.begin(); iremove != taudaughters.end(); ++iremove){
          if ((*iiso)->barcode() == (*iremove)->barcode()) {
#ifdef  DEBUG_HepMCValidationHelper
//            std::cout << "removing particle " << **iiso << " from the list of particles to compute isolation because it comes from a tau" << std::endl;
#endif
            marked = true;
            break;
          }
          if (!marked) forIsolation.push_back(*iiso);
        }
      }
      //no compute isolation wrt the status 2 tau direction
      double sumIso = 0;
      for (iiso = forIsolation.begin(); iiso < forIsolation.end(); ++iiso){
         if (deltaR(taumom, (*iiso)->momentum()) < deltaRcut){
            sumIso += (*iiso)->momentum().perp();
         }
      }
      //if isolated remove the tau daughters from the pruned list
      if (sumIso < sumPtCut) {
#ifdef  DEBUG_HepMCValidationHelper
        std::cout << "particle " <<  *taus[i] <<  " is considered isolated, with sumPt " << sumIso << std::endl;
#endif
        toRemove.insert(toRemove.end(), taudaughters.begin(), taudaughters.end());
      }
    }

    //now actually remove
    pruned.clear();
    for (unsigned int i = 0; i < status1.size(); ++i){
      bool marked = false; 
      std::vector<const HepMC::GenParticle*>::const_iterator iremove;
      for ( iremove = toRemove.begin(); iremove != toRemove.end(); ++iremove){
        if (status1[i]->barcode() == (*iremove)->barcode()){
          marked = true;
          break;
        }
      }
      if (!marked) pruned.push_back(status1[i]);
    }

#ifdef  DEBUG_HepMCValidationHelper    
    std::cout<< "list of remaining particles:" <<std::endl;   
    for (unsigned int i = 0; i < pruned.size(); ++i){
      std::cout << *pruned[i] << std::endl;
    }
#endif    
  } 

bool HepMCValidationHelper::sortByE ( const HepMC::GenParticle *  a, const HepMC::GenParticle *  b  )

inline

Definition at line 15 of file HepMCValidationHelper.h.

{return a->momentum().e() > b->momentum().e(); }

bool HepMCValidationHelper::sortByPseudoRapidity ( const HepMC::GenParticle *  a, const HepMC::GenParticle *  b  )

inline

Definition at line 27 of file HepMCValidationHelper.h.

References a, Vispa.Plugins.EdmBrowser.EdmDataAccessor::all(), allStatus1(), allStatus2(), allStatus3(), allVisibleParticles(), deltaR(), findDescendents(), findFSRPhotons(), genMet(), GenParticle::GenParticle, isChargedLepton(), isNeutrino(), isTau(), AK4GenJetFlavourInfos_cfi::leptons, jetCleaner_cfi::photons, removeIsolatedLeptons(), and TtFullHadEvtBuilder_cfi::sumPt.

{return a->momentum().eta() > b->momentum().eta(); }

bool HepMCValidationHelper::sortByPt ( const HepMC::GenParticle *  a, const HepMC::GenParticle *  b  )

inline

Definition at line 12 of file HepMCValidationHelper.h.

Referenced by WValidation::analyze(), and DrellYanValidation::analyze().

{return a->momentum().perp() > b->momentum().perp(); }

bool HepMCValidationHelper::sortByRapidity ( const HepMC::GenParticle *  a, const HepMC::GenParticle *  b  )

inline

Definition at line 18 of file HepMCValidationHelper.h.

References cmsBatch::log.

                                                                                    {
    const HepMC::FourVector& amom = a->momentum(); 
    const HepMC::FourVector& bmom = b->momentum(); 
    double rapa = 0.5 * std::log( (amom.e() + amom.z()) / (amom.e() - amom.z()) ); 
    double rapb = 0.5 * std::log( (bmom.e() + bmom.z()) / (bmom.e() - bmom.z()) ); 
    return rapa > rapb;
  }