FSRWeightProducer Class Reference

Inheritance diagram for FSRWeightProducer:

Public Member Functions
	FSRWeightProducer (const edm::ParameterSet &)
	~FSRWeightProducer ()
Public Member Functions inherited from edm::EDProducer
	EDProducer ()
ModuleDescription const &	moduleDescription () const
virtual	~EDProducer ()
Public Member Functions inherited from edm::ProducerBase
	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
	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
bool	registeredToConsume (ProductHolderIndex, bool, BranchType) const
bool	registeredToConsumeMany (TypeID const &, BranchType) const
void	updateLookup (BranchType iBranchType, ProductHolderIndexHelper const &)
virtual	~EDConsumerBase ()

Private Member Functions
double	alphaRatio (double)
virtual void	beginJob () override
virtual void	endJob () override
virtual void	produce (edm::Event &, const edm::EventSetup &) override

Private Attributes
edm::EDGetTokenT < reco::GenParticleCollection >	genToken_

Additional Inherited Members
Public Types inherited from edm::EDProducer
typedef EDProducer	ModuleType
Public Types inherited from edm::ProducerBase
typedef ProductRegistryHelper::TypeLabelList	TypeLabelList
Static Public Member Functions inherited from edm::EDProducer
static const std::string &	baseType ()
static void	fillDescriptions (ConfigurationDescriptions &descriptions)
static void	prevalidate (ConfigurationDescriptions &descriptions)
Protected Member Functions inherited from edm::ProducerBase
void	callWhenNewProductsRegistered (std::function< void(BranchDescription const &)> const &func)
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

Definition at line 20 of file FSRWeightProducer.cc.

Constructor & Destructor Documentation

FSRWeightProducer::FSRWeightProducer ( const edm::ParameterSet &  pset )

explicit

Definition at line 36 of file FSRWeightProducer.cc.

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

                                                                {
      genToken_ = consumes<reco::GenParticleCollection>(pset.getUntrackedParameter<edm::InputTag> ("GenTag", edm::InputTag("genParticles")));

      produces<double>();
}

FSRWeightProducer::~FSRWeightProducer

(

)

Definition at line 43 of file FSRWeightProducer.cc.

{}

Member Function Documentation

double FSRWeightProducer::alphaRatio ( double  pt )

private

Definition at line 125 of file FSRWeightProducer.cc.

References funct::A, funct::C, log, and M_PI.

Referenced by produce().

                                              {

      double pigaga = 0.;

      // Leptonic contribution (just one loop, precise at < 0.3% level)
      const double alphapi = 1/137.036/M_PI;
      const double mass_e = 0.0005;
      const double mass_mu = 0.106;
      const double mass_tau = 1.777;
      const double mass_Z = 91.2;
      if (pt>mass_e) pigaga += alphapi * (2*log(pt/mass_e)/3.-5./9.);
      if (pt>mass_mu) pigaga += alphapi * (2*log(pt/mass_mu)/3.-5./9.);
      if (pt>mass_tau) pigaga += alphapi * (2*log(pt/mass_tau)/3.-5./9.);

      // Hadronic vaccum contribution
      // Using simple effective parametrization from Physics Letters B 513 (2001) 46.
      // Top contribution neglected
      double A = 0.;
      double B = 0.;
      double C = 0.;
      if (pt<0.7) {
            A = 0.0; B = 0.0023092; C = 3.9925370;
      } else if (pt<2.0) {
            A = 0.0; B = 0.0022333; C = 4.2191779;
      } else if (pt<4.0) {
            A = 0.0; B = 0.0024402; C = 3.2496684;
      } else if (pt<10.0) {
            A = 0.0; B = 0.0027340; C = 2.0995092;
      } else if (pt<mass_Z) {
            A = 0.0010485; B = 0.0029431; C = 1.0;
      } else if (pt<10000.) {
            A = 0.0012234; B = 0.0029237; C = 1.0;
      } else {
            A = 0.0016894; B = 0.0028984; C = 1.0;
      }
      pigaga += A + B*log(1.+C*pt*pt);

      // Done
      return 1./(1.-pigaga);
}

void FSRWeightProducer::beginJob ( void  )

overrideprivatevirtual

Reimplemented from edm::EDProducer.

Definition at line 46 of file FSRWeightProducer.cc.

{}

void FSRWeightProducer::endJob ( void  )

overrideprivatevirtual

Reimplemented from edm::EDProducer.

Definition at line 49 of file FSRWeightProducer.cc.

{}

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

overrideprivatevirtual

Implements edm::EDProducer.

Definition at line 52 of file FSRWeightProducer.cc.

References funct::abs(), alphaRatio(), funct::cos(), reco::CompositeRefCandidateT< D >::daughter(), reco::CompositeRefCandidateT< D >::daughterRef(), delta, reco::Candidate::energy(), reco::LeafCandidate::energy(), genParticleCandidates2GenParticles_cfi::genParticles, genToken_, edm::Event::getByToken(), i, edm::EventBase::isRealData(), j, reco::Candidate::mass(), reco::LeafCandidate::mass(), reco::CompositeRefCandidateT< D >::mother(), reco::CompositeRefCandidateT< D >::numberOfDaughters(), reco::CompositeRefCandidateT< D >::numberOfMothers(), reco::Candidate::pdgId(), reco::LeafCandidate::pdgId(), reco::Candidate::phi(), reco::LeafCandidate::phi(), funct::pow(), edm::Event::put(), funct::sin(), mathSSE::sqrt(), reco::LeafCandidate::status(), reco::Candidate::theta(), reco::LeafCandidate::theta(), and histoStyle::weight.

Referenced by JSONExport.JsonExport::export(), HTMLExport.HTMLExport::export(), and HTMLExport.HTMLExportStatic::export().

                                                                      {

      if (iEvent.isRealData()) return;

      edm::Handle<reco::GenParticleCollection> genParticles;
      iEvent.getByToken(genToken_, genParticles);

      std::auto_ptr<double> weight (new double);

      // Set a default weight to start with
      (*weight) = 1.;

      unsigned int gensize = genParticles->size();
      for (unsigned int i = 0; i<gensize; ++i) {
            const reco::GenParticle& lepton = (*genParticles)[i];
            if (lepton.status()!=3) continue;
            int leptonId = lepton.pdgId();
            if (abs(leptonId)!=11 && abs(leptonId)!=13 && abs(leptonId)!=15) continue;
            if (lepton.numberOfMothers()!=1) continue;
            const reco::Candidate * boson = lepton.mother();
            int bosonId = abs(boson->pdgId());
            if (bosonId!=23  && bosonId!=24) continue;
            double bosonMass = boson->mass();
            double leptonMass = lepton.mass();
            double leptonEnergy = lepton.energy();
            double cosLeptonTheta = cos(lepton.theta());
            double sinLeptonTheta = sin(lepton.theta());
            double leptonPhi = lepton.phi();

            int trueKey = i;
            if (lepton.numberOfDaughters()==0) {
                  continue;
            } else if (lepton.numberOfDaughters()==1) {
                  int otherleptonKey = lepton.daughterRef(0).key();
                  const reco::GenParticle& otherlepton = (*genParticles)[otherleptonKey];
                  if (otherlepton.pdgId()!=leptonId) continue;
                  if (otherlepton.numberOfDaughters()<=1) continue;
                  trueKey = otherleptonKey;
            }

            const reco::GenParticle& trueLepton = (*genParticles)[trueKey];
            unsigned int nDaughters = trueLepton.numberOfDaughters();

            for (unsigned int j = 0; j<nDaughters; ++j) {
                  const reco::Candidate * photon = trueLepton.daughter(j);
                  if (photon->pdgId()!=22) continue;
                  double photonEnergy = photon->energy();
                  double cosPhotonTheta = cos(photon->theta());
                  double sinPhotonTheta = sin(photon->theta());
                  double photonPhi = photon->phi();
                  double costheta = sinLeptonTheta*sinPhotonTheta*cos(leptonPhi-photonPhi)
                                  + cosLeptonTheta*cosPhotonTheta;
                  // Missing O(alpha) terms in soft-collinear approach
                  // Only for W, from hep-ph/0303260
                  if (bosonId==24) {
                        double betaLepton = sqrt(1-pow(leptonMass/leptonEnergy,2));
                        double delta = - 8*photonEnergy *(1-betaLepton*costheta)
                          / pow(bosonMass,3)
                          / (1-pow(leptonMass/bosonMass,2))
                          / (4-pow(leptonMass/bosonMass,2))
                          * leptonEnergy * (pow(leptonMass,2)/bosonMass+2*photonEnergy);
                        (*weight) *= (1 + delta);
                  }
                  // Missing NLO QED orders in QED parton shower approach
                  // Change coupling scale from 0 to kT to estimate this effect
                  (*weight) *= alphaRatio(photonEnergy*sqrt(1-pow(costheta,2)));
            }
      }


      iEvent.put(weight);
}

Member Data Documentation

edm::EDGetTokenT<reco::GenParticleCollection> FSRWeightProducer::genToken_

private

Definition at line 31 of file FSRWeightProducer.cc.

Referenced by FSRWeightProducer(), and produce().