HadronAndPartonSelector Class Reference

Selects hadrons and partons from a collection of GenParticles. More...

#include <PhysicsTools/JetMCAlgos/plugins/HadronAndPartonSelector.cc>

Inheritance diagram for HadronAndPartonSelector:

Public Member Functions
	HadronAndPartonSelector (const edm::ParameterSet &)
	~HadronAndPartonSelector ()
Public Member Functions inherited from edm::stream::EDProducer<>
	EDProducer ()=default
Public Member Functions inherited from edm::stream::EDProducerBase
	EDProducerBase ()
ModuleDescription const &	moduleDescription () const
virtual	~EDProducerBase ()
Public Member Functions inherited from edm::ProducerBase
void	callWhenNewProductsRegistered (std::function< void(BranchDescription const &)> const &func)
	ProducerBase ()
void	registerProducts (ProducerBase *, ProductRegistry *, ModuleDescription const &)
std::function< void(BranchDescription const &)>	registrationCallback () const
	used by the fwk to register list of products More...
virtual	~ProducerBase ()
Public Member Functions inherited from edm::EDConsumerBase
std::vector< ConsumesInfo >	consumesInfo () const
	EDConsumerBase ()
ProductHolderIndexAndSkipBit	indexFrom (EDGetToken, BranchType, TypeID const &) const
void	itemsMayGet (BranchType, std::vector< ProductHolderIndexAndSkipBit > &) const
void	itemsToGet (BranchType, std::vector< ProductHolderIndexAndSkipBit > &) const
std::vector < ProductHolderIndexAndSkipBit > const &	itemsToGetFromEvent () const
void	labelsForToken (EDGetToken iToken, Labels &oLabels) const
void	modulesDependentUpon (const std::string &iProcessName, std::vector< const char * > &oModuleLabels) const
void	modulesWhoseProductsAreConsumed (std::vector< ModuleDescription const * > &modules, ProductRegistry const &preg, std::map< std::string, ModuleDescription const * > const &labelsToDesc, std::string const &processName) const
bool	registeredToConsume (ProductHolderIndex, bool, BranchType) const
bool	registeredToConsumeMany (TypeID const &, BranchType) const
void	updateLookup (BranchType iBranchType, ProductHolderIndexHelper const &)
virtual	~EDConsumerBase ()

Static Public Member Functions
static void	fillDescriptions (edm::ConfigurationDescriptions &descriptions)
Static Public Member Functions inherited from edm::stream::EDProducerBase
static const std::string &	baseType ()
static void	fillDescriptions (ConfigurationDescriptions &descriptions)
static void	prevalidate (ConfigurationDescriptions &descriptions)

Private Member Functions
virtual void	produce (edm::Event &, const edm::EventSetup &)

Private Attributes
const edm::EDGetTokenT < reco::GenParticleCollection >	particlesToken_
std::string	partonMode_
PartonSelectorPtr	partonSelector_
const edm::EDGetTokenT < GenEventInfoProduct >	srcToken_

Additional Inherited Members
Public Types inherited from edm::stream::EDProducer<>
typedef CacheContexts< T...>	CacheTypes
typedef CacheTypes::GlobalCache	GlobalCache
typedef AbilityChecker< T...>	HasAbility
typedef CacheTypes::LuminosityBlockCache	LuminosityBlockCache
typedef LuminosityBlockContextT < LuminosityBlockCache, RunCache, GlobalCache >	LuminosityBlockContext
typedef CacheTypes::LuminosityBlockSummaryCache	LuminosityBlockSummaryCache
typedef CacheTypes::RunCache	RunCache
typedef RunContextT< RunCache, GlobalCache >	RunContext
typedef CacheTypes::RunSummaryCache	RunSummaryCache
Public Types inherited from edm::stream::EDProducerBase
typedef EDProducerAdaptorBase	ModuleType
Public Types inherited from edm::ProducerBase
typedef ProductRegistryHelper::TypeLabelList	TypeLabelList
Public Types inherited from edm::EDConsumerBase
typedef ProductLabels	Labels
Protected Member Functions inherited from edm::EDConsumerBase
template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	consumes (edm::InputTag const &tag)
EDGetToken	consumes (const TypeToGet &id, edm::InputTag const &tag)
template<BranchType B>
EDGetToken	consumes (TypeToGet const &id, edm::InputTag const &tag)
ConsumesCollector	consumesCollector ()
	Use a ConsumesCollector to gather consumes information from helper functions. More...
template<typename ProductType , BranchType B = InEvent>
void	consumesMany ()
void	consumesMany (const TypeToGet &id)
template<BranchType B>
void	consumesMany (const TypeToGet &id)
template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	mayConsume (edm::InputTag const &tag)
EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)
template<BranchType B>
EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)

Detailed Description

Selects hadrons and partons from a collection of GenParticles.

This producer selects hadrons, partons, and leptons from a collection of GenParticles and stores vectors of EDM references to these particles in the event. The following hadrons are selected:

• b hadrons that do not have other b hadrons as daughters
• c hadrons that do not have other c hadrons as daughters

Older Fortran Monte Carlo generators (Pythia6 and Herwig6) follow the HEPEVT [1] particle status code convention while newer C++ Monte Carlo generators (Pythia8, Herwig++, and Sherpa) follow the HepMC [2] particle status code convention. However, both conventions give considerable freedom in defining the status codes of intermediate particle states. Hence, the parton selection is generator-dependent and is described in each of the parton selectors separately.

Using the provenance information of the GenEventInfoProduct, the producer attempts to automatically determine what generator was used to hadronize events and based on that information decides what parton selection mode to use. It is also possible to enforce any of the supported parton selection modes.

The selected hadrons and partons are finally used by the JetFlavourClustering producer to determine the jet flavour.

The following leptons are selected:

• status==1 electrons and muons
• status==2 taus

[1] http://cepa.fnal.gov/psm/stdhep/ [2] http://lcgapp.cern.ch/project/simu/HepMC/

Definition at line 79 of file HadronAndPartonSelector.cc.

Constructor & Destructor Documentation

HadronAndPartonSelector::HadronAndPartonSelector ( const edm::ParameterSet &  iConfig )

explicit

Definition at line 104 of file HadronAndPartonSelector.cc.

                                                                               :

  srcToken_(mayConsume<GenEventInfoProduct>( iConfig.getParameter<edm::InputTag>("src") )),
  particlesToken_(consumes<reco::GenParticleCollection>( iConfig.getParameter<edm::InputTag>("particles") )),
  partonMode_(iConfig.getParameter<std::string>("partonMode"))

{
   //register your products
   produces<reco::GenParticleRefVector>( "bHadrons" );
   produces<reco::GenParticleRefVector>( "cHadrons" );
   produces<reco::GenParticleRefVector>( "algorithmicPartons" );
   produces<reco::GenParticleRefVector>( "physicsPartons" );
   produces<reco::GenParticleRefVector>( "leptons" );
}

HadronAndPartonSelector::~HadronAndPartonSelector

(

)

Definition at line 120 of file HadronAndPartonSelector.cc.

{

   // do anything here that needs to be done at desctruction time
   // (e.g. close files, deallocate resources etc.)

}

Member Function Documentation

void HadronAndPartonSelector::fillDescriptions ( edm::ConfigurationDescriptions &  descriptions )

static

Definition at line 266 of file HadronAndPartonSelector.cc.

References edm::ConfigurationDescriptions::addDefault(), and edm::ParameterSetDescription::setUnknown().

                                                                                    {
  //The following says we do not know what parameters are allowed so do no validation
  // Please change this to state exactly what you do use, even if it is no parameters
  edm::ParameterSetDescription desc;
  desc.setUnknown();
  descriptions.addDefault(desc);
}

void HadronAndPartonSelector::produce ( edm::Event &  iEvent, const edm::EventSetup &  iSetup  )

privatevirtual

Implements edm::stream::EDProducerBase.

Definition at line 135 of file HadronAndPartonSelector.cc.

References Exception, edm::Event::getByToken(), edm::Event::getProvenance(), CandMCTagUtils::hasBottom(), CandMCTagUtils::hasCharm(), i, edm::HandleBase::id(), reco::isElectron(), reco::isMuon(), CandMCTagUtils::isParton(), reco::isTau(), edm::HandleBase::isValid(), HLT_25ns14e33_v1_cff::leptons, edm::moduleName(), particlesToken_, partonMode_, partonSelector_, edm::Event::put(), srcToken_, and AlCaHLTBitMon_QueryRunRegistry::string.

{
   // determine hadronizer type (done only once per job)
   if( partonMode_=="Auto" )
   {
     edm::Handle<GenEventInfoProduct> genEvtInfoProduct;
     iEvent.getByToken(srcToken_, genEvtInfoProduct);

     std::string moduleName = "";
     if( genEvtInfoProduct.isValid() ) {
       const edm::Provenance& prov = iEvent.getProvenance(genEvtInfoProduct.id());
       moduleName = edm::moduleName(prov);
     }

     if( moduleName.find("Pythia6")!=std::string::npos )
       partonMode_="Pythia6";
     else if( moduleName.find("Pythia8")!=std::string::npos )
       partonMode_="Pythia8";
     else if( moduleName.find("Herwig6")!=std::string::npos )
       partonMode_="Herwig6";
     else if( moduleName.find("ThePEG")!=std::string::npos )
       partonMode_="Herwig++";
     else if( moduleName.find("Sherpa")!=std::string::npos )
       partonMode_="Sherpa";
     else
       partonMode_="Undefined";
   }

   // set the parton selection mode (done only once per job)
   if( !partonSelector_ )
   {
     if ( partonMode_=="Undefined" )
       edm::LogWarning("UndefinedPartonMode") << "Could not automatically determine the hadronizer type and set the correct parton selection mode. Parton-based jet flavour will not be defined.";
     else if ( partonMode_=="Pythia6" )
     {
       partonSelector_ = PartonSelectorPtr( new Pythia6PartonSelector() );
       edm::LogInfo("PartonModeDefined") << "Using Pythia6 parton selection mode.";
     }
     else if ( partonMode_=="Pythia8" )
     {
       partonSelector_ = PartonSelectorPtr( new Pythia8PartonSelector() );
       edm::LogInfo("PartonModeDefined") << "Using Pythia8 parton selection mode.";
     }
     else if ( partonMode_=="Herwig6" )
     {
       partonSelector_ = PartonSelectorPtr( new Herwig6PartonSelector() );
       edm::LogInfo("PartonModeDefined") << "Using Herwig6 parton selection mode.";
     }
     else if ( partonMode_=="Herwig++" )
     {
       partonSelector_ = PartonSelectorPtr( new HerwigppPartonSelector() );
       edm::LogInfo("PartonModeDefined") << "Using Herwig++ parton selection mode.";
     }
     else if ( partonMode_=="Sherpa" )
     {
       partonSelector_ = PartonSelectorPtr( new SherpaPartonSelector() );
       edm::LogInfo("PartonModeDefined") << "Using Sherpa parton selection mode.";
     }
     else
       throw cms::Exception("InvalidPartonMode") <<"Parton selection mode is invalid: " << partonMode_ << ", use Auto | Pythia6 | Pythia8 | Herwig6 | Herwig++ | Sherpa" << std::endl;
   }

   edm::Handle<reco::GenParticleCollection> particles;
   iEvent.getByToken(particlesToken_, particles);

   std::auto_ptr<reco::GenParticleRefVector> bHadrons ( new reco::GenParticleRefVector );
   std::auto_ptr<reco::GenParticleRefVector> cHadrons ( new reco::GenParticleRefVector );
   std::auto_ptr<reco::GenParticleRefVector> partons  ( new reco::GenParticleRefVector );
   std::auto_ptr<reco::GenParticleRefVector> physicsPartons  ( new reco::GenParticleRefVector );
   std::auto_ptr<reco::GenParticleRefVector> leptons  ( new reco::GenParticleRefVector );

   // loop over particles and select b and c hadrons and leptons
   for(reco::GenParticleCollection::const_iterator it = particles->begin(); it != particles->end(); ++it)
   {
     // if b hadron
     if( CandMCTagUtils::hasBottom( *it ) )
     {
       // check if any of the daughters is also a b hadron
       bool hasbHadronDaughter = false;
       for(size_t i=0; i < it->numberOfDaughters(); ++i)
       {
         if( CandMCTagUtils::hasBottom( *(it->daughter(i)) ) ) { hasbHadronDaughter = true; break; }
       }
       if( hasbHadronDaughter ) continue; // skip excited b hadrons that have other b hadrons as daughters

       bHadrons->push_back( reco::GenParticleRef( particles, it - particles->begin() ) );
     }

     // if c hadron
     if( CandMCTagUtils::hasCharm( *it ) )
     {
       // check if any of the daughters is also a c hadron
       bool hascHadronDaughter = false;
       for(size_t i=0; i < it->numberOfDaughters(); ++i)
       {
         if( CandMCTagUtils::hasCharm( *(it->daughter(i)) ) ) { hascHadronDaughter = true; break; }
       }
       if( hascHadronDaughter ) continue; // skip excited c hadrons that have other c hadrons as daughters

       cHadrons->push_back( reco::GenParticleRef( particles, it - particles->begin() ) );
     }

     // status==1 electrons and muons
     if( ( reco::isElectron( *it ) || reco::isMuon( *it ) ) && it->status()==1 )
       leptons->push_back( reco::GenParticleRef( particles, it - particles->begin() ) );

     // status==2 taus
     if( reco::isTau( *it ) && it->status()==2 )
       leptons->push_back( reco::GenParticleRef( particles, it - particles->begin() ) );
   }

   // select partons
   if ( partonMode_!="Undefined" ) {
     partonSelector_->run(particles,partons);
     for(reco::GenParticleCollection::const_iterator it = particles->begin(); it != particles->end(); ++it)
     {
       if( !(it->status()==3 || (( partonMode_=="Pythia8" ) && (it->status()==23)))) continue;
       if( !CandMCTagUtils::isParton( *it ) ) continue;  // skip particle if not a parton
       physicsPartons->push_back( reco::GenParticleRef( particles, it - particles->begin() ) );
     }
   }

   iEvent.put( bHadrons, "bHadrons" );
   iEvent.put( cHadrons, "cHadrons" );
   iEvent.put( partons,  "algorithmicPartons" );
   iEvent.put( physicsPartons,  "physicsPartons" );
   iEvent.put( leptons,  "leptons" );
}

Member Data Documentation

const edm::EDGetTokenT<reco::GenParticleCollection> HadronAndPartonSelector::particlesToken_

private

Definition at line 91 of file HadronAndPartonSelector.cc.

Referenced by produce().

std::string HadronAndPartonSelector::partonMode_

private

Definition at line 93 of file HadronAndPartonSelector.cc.

Referenced by produce().

PartonSelectorPtr HadronAndPartonSelector::partonSelector_

private

Definition at line 94 of file HadronAndPartonSelector.cc.

Referenced by produce().

const edm::EDGetTokenT<GenEventInfoProduct> HadronAndPartonSelector::srcToken_

private

Definition at line 90 of file HadronAndPartonSelector.cc.

Referenced by produce().