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...

Typedef Documentation

IG

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

Definition at line 10 of file GenParticlesHelper.h.

IGR

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

Definition at line 11 of file GenParticlesHelper.h.

Function Documentation

findDescendents()

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)

Definition at line 28 of file GenParticlesHelper.cc.

References funct::abs(), edmMakeDummyCfis::base, edm::RefVector< C, T, F >::begin(), edm::RefVector< C, T, F >::end(), EgammaValidation_cff::pdgId, edm::RefVector< C, T, F >::push_back(), and mps_update::status.

Referenced by TauGenJetProducer::produce().

                                  {
    const GenParticleRefVector& daughterRefs = base->daughterRefVector();

    for (IGR idr = daughterRefs.begin(); idr != daughterRefs.end(); ++idr) {
      if ((*idr)->status() == status && (!pdgId || std::abs((*idr)->pdgId()) == pdgId)) {
        // cout<<"adding "<<(*idr)<<endl;
        descendents.push_back(*idr);
      } else
        findDescendents(*idr, descendents, status, pdgId);
    }
  }

findParticles()

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

find all particles of a given pdgId and status

Definition at line 8 of file GenParticlesHelper.cc.

References funct::abs(), EgammaValidation_cff::pdgId, edm::RefVector< C, T, F >::push_back(), and mps_update::status.

Referenced by TauGenJetProducer::produce().

                                 {
    unsigned index = 0;
    for (IG ig = sourceParticles.begin(); ig != sourceParticles.end(); ++ig, ++index) {
      const GenParticle& gen = *ig;

      // status has been specified, and this one does not have the correct
      // status
      if (status && gen.status() != status)
        continue;

      if (std::abs(gen.pdgId()) == pdgId) {
        GenParticleRef genref(&sourceParticles, index);
        particleRefs.push_back(genref);
      }
    }
  }

findSisters()

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

find the particles having the same daughter as baseSister

Definition at line 43 of file GenParticlesHelper.cc.

References cms::cuda::assert(), edm::RefVector< C, T, F >::begin(), edm::RefVector< C, T, F >::end(), l1ctLayer2EG_cff::id, and edm::RefVector< C, T, F >::push_back().

                                                                                           {
    assert(baseSister->numberOfMothers() > 0);

    // get first mother
    const GenParticleRefVector& mothers = baseSister->motherRefVector();

    // get sisters
    const GenParticleRefVector allRefs = mothers[0]->daughterRefVector();

    typedef GenParticleRefVector::const_iterator IT;
    for (IT id = allRefs.begin(); id != allRefs.end(); ++id) {
      if (*id == baseSister) {
        continue;  // this is myself
      } else
        sisterRefs.push_back(*id);
    }
  }

hasAncestor()

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 77 of file GenParticlesHelper.cc.

References edm::RefVector< C, T, F >::begin(), edm::RefVector< C, T, F >::end(), reco::CompositeRefCandidateT< D >::motherRefVector(), EgammaValidation_cff::pdgId, reco::LeafCandidate::pdgId(), mps_update::status, and reco::LeafCandidate::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;
  }

isDirect()

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 61 of file GenParticlesHelper.cc.

References cms::cuda::assert(), and mps_update::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;
    }
  }