metsig::METSignificance Class Reference

#include <METSignificance.h>

Public Member Functions
reco::METCovMatrix	getCovariance (const edm::View< reco::Jet > &jets, const std::vector< edm::Handle< reco::CandidateView > > &leptons, const edm::Handle< edm::View< reco::Candidate > > &pfCandidates, double rho, JME::JetResolution &resPtObj, JME::JetResolution &resPhiObj, JME::JetResolutionScaleFactor &resSFObj, bool isRealData)
	METSignificance (const edm::ParameterSet &iConfig)
	~METSignificance ()

Static Public Member Functions
static double	getSignificance (const reco::METCovMatrix &cov, const reco::MET &met)

Private Member Functions
bool	cleanJet (const reco::Jet &jet, const std::vector< edm::Handle< reco::CandidateView > > &leptons)

Private Attributes
double	dR2match_
std::vector< double >	jetEtas_
std::vector< double >	jetParams_
double	jetThreshold_
std::vector< double >	pjetParams_

Detailed Description

Definition at line 35 of file METSignificance.h.

Constructor & Destructor Documentation

METSignificance::METSignificance

(

const edm::ParameterSet &

iConfig

)

Definition at line 31 of file METSignificance.cc.

References CaloRecoTauDiscriminationAgainstMuon_cfi::dRmatch, and edm::ParameterSet::getParameter().

                                                                     {

  edm::ParameterSet cfgParams = iConfig.getParameter<edm::ParameterSet>("parameters");

  double dRmatch = cfgParams.getParameter<double>("dRMatch");
  dR2match_ = dRmatch*dRmatch;
  
  jetThreshold_ = cfgParams.getParameter<double>("jetThreshold");
  jetEtas_ = cfgParams.getParameter<std::vector<double> >("jeta");
  jetParams_ = cfgParams.getParameter<std::vector<double> >("jpar");
  pjetParams_ = cfgParams.getParameter<std::vector<double> >("pjpar");
  
}

METSignificance::~METSignificance

(

)

Definition at line 45 of file METSignificance.cc.

                                        {
}

Member Function Documentation

bool METSignificance::cleanJet ( const reco::Jet &  jet, const std::vector< edm::Handle< reco::CandidateView > > &  leptons  )

private

Definition at line 201 of file METSignificance.cc.

References reco::deltaR2(), and AK4GenJetFlavourInfos_cfi::leptons.

                                                                {

  for ( const auto& lep_i : leptons ) {
    for( const auto& lep : *lep_i ) {
        if ( reco::deltaR2(lep, jet) < dR2match_ ) {
           return false;
        }
     }
  }
  return true;
}

reco::METCovMatrix METSignificance::getCovariance	(	const edm::View< reco::Jet > &	jets,
		const std::vector< edm::Handle< reco::CandidateView > > &	leptons,
		const edm::Handle< edm::View< reco::Candidate > > &	pfCandidates,
		double	rho,
		JME::JetResolution &	resPtObj,
		JME::JetResolution &	resPhiObj,
		JME::JetResolutionScaleFactor &	resSFObj,
		bool	isRealData
	)

Definition at line 50 of file METSignificance.cc.

References funct::abs(), EnergyCorrector::c, JME::JetResolution::getResolution(), mps_fire::i, metsig::jet, METSignificanceParams_cfi::jeta, AK4GenJetFlavourInfos_cfi::leptons, gen::n, slimmedMuons_cfi::pfCandidates, edm::View< T >::ptrAt(), alignCSCRings::s, Scenarios_cff::scale, JME::JetParameters::setJetEta(), JME::JetParameters::setJetPt(), JME::JetParameters::setRho(), edm::View< T >::size(), and TtFullHadEvtBuilder_cfi::sumPt.

Referenced by cms::PFMETProducer::getMETCovMatrix(), pat::PATMETProducer::getMETCovMatrix(), and cms::METSignificanceProducer::produce().

                                        {

  //pfcandidates
  const edm::View<reco::Candidate>* pfCandidates=pfCandidatesH.product();

   // metsig covariance
   double cov_xx = 0;
   double cov_xy = 0;
   double cov_yy = 0;
 
   // for lepton and jet subtraction
   std::unordered_set<reco::CandidatePtr,ptr_hash> footprint;

   // subtract leptons out of sumPt
   for ( const auto& lep_i : leptons ) {
     for( const auto& lep : *lep_i ) {
       if( lep.pt() > 10 ){
     for( unsigned int n=0; n < lep.numberOfSourceCandidatePtrs(); n++ ){
       if( lep.sourceCandidatePtr(n).isNonnull() and lep.sourceCandidatePtr(n).isAvailable() ){
         footprint.insert(lep.sourceCandidatePtr(n));
       } 
     }
       }
     }
   }
   // subtract jets out of sumPt
   for(const auto& jet : jets) {

     // disambiguate jets and leptons
     if(!cleanJet(jet, leptons) ) continue;
     for( unsigned int n=0; n < jet.numberOfSourceCandidatePtrs(); n++){
       if( jet.sourceCandidatePtr(n).isNonnull() and jet.sourceCandidatePtr(n).isAvailable() ){

     footprint.insert(jet.sourceCandidatePtr(n));
       }
     }

   }

   // calculate sumPt
   double sumPt = 0;
   for(size_t i = 0; i< pfCandidates->size();  ++i) {
     
     // check if candidate exists in a lepton or jet
     bool cleancand = true;
     if(footprint.find( pfCandidates->ptrAt(i) )==footprint.end()) {

       //dP4 recovery
       for( const auto& it : footprint) {
     if( (it->p4()-(*pfCandidates)[i].p4()).Et2()<0.000025 ){
       cleancand = false;
       break;
     }
       }
       // if not, add to sumPt
       if( cleancand ){
     sumPt += (*pfCandidates)[i].pt();
       }
     }
   }
   
   // add jets to metsig covariance matrix and subtract them from sumPt
   for(const auto& jet : jets) {
     
     // disambiguate jets and leptons
     if(!cleanJet(jet, leptons) ) continue;

      double jpt  = jet.pt();
      double jeta = jet.eta();
      double feta = std::abs(jeta);
      double c = jet.px()/jet.pt();
      double s = jet.py()/jet.pt();

      JME::JetParameters parameters;
      parameters.setJetPt(jpt).setJetEta(jeta).setRho(rho);

      // jet energy resolutions
      double sigmapt = resPtObj.getResolution(parameters);
      double sigmaphi = resPhiObj.getResolution(parameters);
      // SF not needed since is already embedded in the sigma in the dataGlobalTag
      //      double sigmaSF = isRealData ? resSFObj.getScaleFactor(parameters) : 1.0;

      // split into high-pt and low-pt sector
      if( jpt > jetThreshold_ ){
         // high-pt jets enter into the covariance matrix via JER

         double scale = 0;
         if(feta<jetEtas_[0]) scale = jetParams_[0];
         else if(feta<jetEtas_[1]) scale = jetParams_[1];
         else if(feta<jetEtas_[2]) scale = jetParams_[2];
         else if(feta<jetEtas_[3]) scale = jetParams_[3];
         else scale = jetParams_[4];

     //         double dpt = sigmaSF*scale*jpt*sigmapt;
         double dpt = scale*jpt*sigmapt;
         double dph = jpt*sigmaphi;

         cov_xx += dpt*dpt*c*c + dph*dph*s*s;
         cov_xy += (dpt*dpt-dph*dph)*c*s;
         cov_yy += dph*dph*c*c + dpt*dpt*s*s;

      } else {

         // add the (corrected) jet to the sumPt
         sumPt += jpt;

      }

   }

   //protection against unphysical events
   if(sumPt<0) sumPt=0;
 
   // add pseudo-jet to metsig covariance matrix
   cov_xx += pjetParams_[0]*pjetParams_[0] + pjetParams_[1]*pjetParams_[1]*sumPt;
   cov_yy += pjetParams_[0]*pjetParams_[0] + pjetParams_[1]*pjetParams_[1]*sumPt;

   reco::METCovMatrix cov;
   cov(0,0) = cov_xx;
   cov(1,0) = cov_xy;
   cov(0,1) = cov_xy;
   cov(1,1) = cov_yy;

   return cov;
}

double METSignificance::getSignificance ( const reco::METCovMatrix &  cov, const reco::MET &  met  )

static

Definition at line 184 of file METSignificance.cc.

References reco::LeafCandidate::px(), and reco::LeafCandidate::py().

Referenced by pat::PATMETProducer::produce(), cms::METSignificanceProducer::produce(), and CorrectedPATMETProducer::produce().

                                                                                      {

   // covariance matrix determinant
   double det = cov(0,0)*cov(1,1) - cov(0,1)*cov(1,0);

   // invert matrix
   double ncov_xx = cov(1,1) / det;
   double ncov_xy = -cov(0,1) / det;
   double ncov_yy = cov(0,0) / det;

   // product of met and inverse of covariance
   double sig = met.px()*met.px()*ncov_xx + 2*met.px()*met.py()*ncov_xy + met.py()*met.py()*ncov_yy;

   return sig;
}

Member Data Documentation

double metsig::METSignificance::dR2match_

private

Definition at line 56 of file METSignificance.h.

std::vector<double> metsig::METSignificance::jetEtas_

private

Definition at line 57 of file METSignificance.h.

std::vector<double> metsig::METSignificance::jetParams_

private

Definition at line 58 of file METSignificance.h.

double metsig::METSignificance::jetThreshold_

private

Definition at line 55 of file METSignificance.h.

std::vector<double> metsig::METSignificance::pjetParams_

private

Definition at line 59 of file METSignificance.h.