GenParticlesHelper Namespace Reference

Typedefs
typedef reco::GenParticleCollection::const_iterator	IG
typedef reco::GenParticleRefVector::const_iterator	IGR

Functions
void	findDescendents (const reco::GenParticleRef &base, reco::GenParticleRefVector &descendents, int status, int pdgId=0)
	find all descendents of a given status and pdgId (recursive) More...
void	findParticles (const reco::GenParticleCollection &sourceParticles, reco::GenParticleRefVector &particleRefs, int pdgId, int status)
	find all particles of a given pdgId and status More...
void	findSisters (const reco::GenParticleRef &baseSister, reco::GenParticleRefVector &sisterRefs)
	find the particles having the same daughter as baseSister More...
bool	hasAncestor (const reco::GenParticle *particle, int pdgId, int status)
	does the particle have an ancestor with this pdgId and this status? More...
bool	isDirect (const reco::GenParticleRef &particle)
	check if particle is direct (has status 3 or is a daughter of particle with status 3) More...
std::ostream &	operator<< (std::ostream &out, const reco::GenParticleRef &genRef)

Typedef Documentation

typedef reco::GenParticleCollection::const_iterator GenParticlesHelper::IG

Definition at line 10 of file GenParticlesHelper.h.

typedef reco::GenParticleRefVector::const_iterator GenParticlesHelper::IGR

Definition at line 11 of file GenParticlesHelper.h.

Function Documentation

void GenParticlesHelper::findDescendents	(	const reco::GenParticleRef &	base,
		reco::GenParticleRefVector &	descendents,
		int	status,
		int	pdgId = 0
	)

find all descendents of a given status and pdgId (recursive)

Referenced by TauGenJetProducer::produce().

void GenParticlesHelper::findParticles	(	const reco::GenParticleCollection &	sourceParticles,
		reco::GenParticleRefVector &	particleRefs,
		int	pdgId,
		int	status
	)

find all particles of a given pdgId and status

Referenced by TauGenJetProducer::produce().

void GenParticlesHelper::findSisters	(	const reco::GenParticleRef &	baseSister,
		reco::GenParticleRefVector &	sisterRefs
	)

find the particles having the same daughter as baseSister

bool GenParticlesHelper::hasAncestor	(	const reco::GenParticle *	particle,
		int	pdgId,
		int	status
	)

does the particle have an ancestor with this pdgId and this status?

Definition at line 98 of file GenParticlesHelper.cc.

References edm::RefVector< C, T, F >::begin(), edm::RefVector< C, T, F >::end(), reco::CompositeRefCandidateT< D >::motherRefVector(), reco::LeafCandidate::pdgId(), reco::LeafCandidate::status(), and ntuplemaker::status.

                                     {    
 
    if( particle->pdgId() == pdgId && 
    particle->status() == status )
      return true;

    const GenParticleRefVector& mothers = particle->motherRefVector();
    
    for( IGR im = mothers.begin(); im!=mothers.end(); ++im) {
      const GenParticle& part = **im;
      if( hasAncestor( &part, pdgId, status) )
    return true;
    } 

    return false;
  }

bool GenParticlesHelper::isDirect

(

const reco::GenParticleRef &

particle

)

check if particle is direct (has status 3 or is a daughter of particle with status 3)

Definition at line 81 of file GenParticlesHelper.cc.

References assert(), and ntuplemaker::status.

                                               {
    assert( (particle->status() != 0) && (particle->status() < 4 ) );
    if( particle->status() == 3 )
      return true;
    else {
      assert( particle->numberOfMothers() > 0 );
  
      // get first mother 
      const GenParticleRefVector& mothers = particle->motherRefVector();
      if( mothers[0]->status() == 3 )
    return true;
      else
    return false;
    }
  }

std::ostream & GenParticlesHelper::operator<<	(	std::ostream &	out,
		const reco::GenParticleRef &	genRef
	)

Definition at line 117 of file GenParticlesHelper.cc.

References edm::Ref< C, T, F >::key(), and dbtoconf::out.

                                                   {
    
    if(!out) return out;
    
    out<<genRef.key()<<" "<<genRef->pt();
    
    return out;
  }