TauGenJetProducer Class Reference

builds a GenJet from the visible daughters of each status 2 tau in the event. More...

#include <TauGenJetProducer.h>

Inheritance diagram for TauGenJetProducer:

List of all members.

Public Member Functions
virtual void	beginJob ()
virtual void	produce (edm::Event &, const edm::EventSetup &)
	TauGenJetProducer (const edm::ParameterSet &)
	~TauGenJetProducer ()
Private Attributes
bool	includeNeutrinos_
	if yes, neutrinos will be included, for debug purposes
edm::InputTag	inputTagGenParticles_
	Input PFCandidates.
bool	verbose_
	verbose ?

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Detailed Description

builds a GenJet from the visible daughters of each status 2 tau in the event.

Author:

Colin Bernet

Date:

february 2008

Definition at line 23 of file TauGenJetProducer.h.

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Constructor & Destructor Documentation

TauGenJetProducer::TauGenJetProducer

(

const edm::ParameterSet &

iConfig

)

[explicit]

Definition at line 20 of file TauGenJetProducer.cc.

References edm::ParameterSet::getParameter(), and edm::ParameterSet::getUntrackedParameter().

{
  inputTagGenParticles_ 
    = iConfig.getParameter<InputTag>("GenParticles");

  includeNeutrinos_ 
    = iConfig.getParameter<bool>("includeNeutrinos");

  verbose_ = 
    iConfig.getUntrackedParameter<bool>("verbose",false);

  produces<GenJetCollection>();
}

TauGenJetProducer::~TauGenJetProducer

(

)

Definition at line 34 of file TauGenJetProducer.cc.

{ }

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Member Function Documentation

void TauGenJetProducer::beginJob

(

void

)

[virtual]

Reimplemented from edm::EDProducer.

Definition at line 36 of file TauGenJetProducer.cc.

{ }

void TauGenJetProducer::produce	(	edm::Event &	iEvent,
		const edm::EventSetup &	iSetup
	)		[virtual]

Implements edm::EDProducer.

Definition at line 38 of file TauGenJetProducer.cc.

References abs, edm::RefVector< C, T, F >::begin(), DeDxDiscriminatorTools::charge(), gather_cfg::cout, edm::RefVector< C, T, F >::end(), Exception, GenParticlesHelper::findDescendents(), GenParticlesHelper::findParticles(), newFWLiteAna::found, genParticleCandidates2GenParticles_cfi::genParticles, edm::Event::getByLabel(), metsig::jet, edm::Event::put(), edm::refToPtr(), reco::LeafCandidate::setCharge(), and edm::RefVector< C, T, F >::size().

                                                          {
  
  Handle<GenParticleCollection> genParticles;

  bool found = iEvent.getByLabel( inputTagGenParticles_, genParticles);
  
  if ( !found ) {
    std::ostringstream  err;
    err<<" cannot get collection: "
       <<inputTagGenParticles_<<std::endl;
    edm::LogError("TauGenJetProducer")<<err.str();
    throw cms::Exception( "MissingProduct", err.str());
  }

  std::auto_ptr<GenJetCollection> 
    pOutVisTaus(new GenJetCollection());

  using namespace GenParticlesHelper;

  GenParticleRefVector allStatus2Taus;  
  findParticles( *genParticles,
                 allStatus2Taus, 15, 2);

  for ( IGR iTau=allStatus2Taus.begin(); iTau!=allStatus2Taus.end(); ++iTau ) {

    // look for all status 1 (stable) descendents 
    GenParticleRefVector descendents;
    findDescendents( *iTau, descendents, 1);

    // CV: skip status 2 taus that radiate-off a photon
    //    --> have a status 2 tau lepton in the list of descendents
    GenParticleRefVector status2TauDaughters;
    findDescendents( *iTau, status2TauDaughters, 2, 15 );
    if ( status2TauDaughters.size() > 0 ) continue;
    
    // loop on descendents, and take all except neutrinos
    math::XYZTLorentzVector sumVisMom;
    Particle::Charge charge = 0;
    Jet::Constituents constituents;

    if(verbose_)
      cout<<"tau "<<(*iTau)<<endl;

    for(IGR igr = descendents.begin(); 
        igr!= descendents.end(); ++igr ) {
      
      int absPdgId = abs((*igr)->pdgId());
      
      // neutrinos
      if(!includeNeutrinos_ ) {
        if( absPdgId == 12 || 
            absPdgId == 14 || 
            absPdgId == 16  ) 
          continue;
      }      

      if(verbose_) 
        cout<<"\t"<<(*igr)<<endl;
      
      charge += (*igr)->charge();
      sumVisMom += (*igr)->p4();

      // need to convert the vector of reference to the constituents
      // to a vector of pointers to build the genjet
      constituents.push_back( refToPtr( *igr) );
    }

    math::XYZPoint vertex;
    GenJet::Specific specific;
    
    GenJet jet( sumVisMom, vertex, specific, constituents); 
    
    if (charge != (*iTau)->charge() )
      std::cout<<" charge of Tau: " << (*iTau) << " not equal to charge of sum of charge of all descendents. " << std::cout;

    jet.setCharge(charge);
    pOutVisTaus->push_back( jet );
    
  }
  iEvent.put( pOutVisTaus );
}

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Member Data Documentation

bool TauGenJetProducer::includeNeutrinos_ [private]

if yes, neutrinos will be included, for debug purposes

Definition at line 40 of file TauGenJetProducer.h.

edm::InputTag TauGenJetProducer::inputTagGenParticles_ [private]

Input PFCandidates.

Definition at line 37 of file TauGenJetProducer.h.

bool TauGenJetProducer::verbose_ [private]

verbose ?

Definition at line 43 of file TauGenJetProducer.h.