EgammaSCEnergyCorrectionAlgo Class Reference

#include <EgammaSCEnergyCorrectionAlgo.h>

Public Member Functions
reco::SuperCluster	applyCorrection (const reco::SuperCluster &cl, const EcalRecHitCollection &rhc, reco::CaloCluster::AlgoId theAlgo, const CaloSubdetectorGeometry *geometry, EcalClusterFunctionBaseClass *energyCorrectionFunction, std::string energyCorrectorName_, int modeEB_, int modeEE_)
reco::SuperCluster	applyCrackCorrection (const reco::SuperCluster &cl, EcalClusterFunctionBaseClass *crackCorrectionFunction)
reco::SuperCluster	applyLocalContCorrection (const reco::SuperCluster &cl, EcalClusterFunctionBaseClass *localContCorrectionFunction)
	EgammaSCEnergyCorrectionAlgo (float noise, reco::CaloCluster::AlgoId theAlgo, const edm::ParameterSet &pset)
	~EgammaSCEnergyCorrectionAlgo ()

Private Member Functions
float	fNCrystals (int nCry, reco::CaloCluster::AlgoId theAlgo, EcalSubdetector theBase) const
int	nCrystalsGT2Sigma (reco::BasicCluster const &seed, EcalRecHitCollection const &rhc) const

Private Attributes
float	sigmaElectronicNoise_
reco::CaloCluster::AlgoId	theAlgo_

Detailed Description

Definition at line 20 of file EgammaSCEnergyCorrectionAlgo.h.

Constructor & Destructor Documentation

EgammaSCEnergyCorrectionAlgo()

EgammaSCEnergyCorrectionAlgo::EgammaSCEnergyCorrectionAlgo	(	float	noise,
		reco::CaloCluster::AlgoId	theAlgo,
		const edm::ParameterSet &	pset
	)

Definition at line 11 of file EgammaSCEnergyCorrectionAlgo.cc.

{
  sigmaElectronicNoise_ = noise;
}

References hgcalDigitizer_cfi::noise, and sigmaElectronicNoise_.

~EgammaSCEnergyCorrectionAlgo()

EgammaSCEnergyCorrectionAlgo::~EgammaSCEnergyCorrectionAlgo ( )

inline

Definition at line 24 of file EgammaSCEnergyCorrectionAlgo.h.

{}

Member Function Documentation

applyCorrection()

reco::SuperCluster EgammaSCEnergyCorrectionAlgo::applyCorrection	(	const reco::SuperCluster &	cl,
		const EcalRecHitCollection &	rhc,
		reco::CaloCluster::AlgoId	theAlgo,
		const CaloSubdetectorGeometry *	geometry,
		EcalClusterFunctionBaseClass *	energyCorrectionFunction,
		std::string	energyCorrectorName_,
		int	modeEB_,
		int	modeEE_
	)

Definition at line 19 of file EgammaSCEnergyCorrectionAlgo.cc.

                                                                                    {
  // A little bit of trivial info to be sure all is well
 
  {
    LogTrace("EgammaSCEnergyCorrectionAlgo") << "::applyCorrection" << std::endl;
    LogTrace() << "   SC has energy " << cl.energy() << std::endl;
    LogTrace() << "   Will correct now.... " << std::endl;
  }
 
  // Get the seed cluster
  const reco::CaloClusterPtr& seedC = cl.seed();
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   Seed cluster energy... " << seedC->energy() << std::endl;
 
  // Find the algorithm used to construct the basic clusters making up the supercluster
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   The seed cluster used algo " << theAlgo;
 
  // Find the detector region of the supercluster
  // where is the seed cluster?
  std::vector<std::pair<DetId, float> > seedHits = seedC->hitsAndFractions();
  EcalSubdetector theBase = EcalSubdetector(seedHits.at(0).first.subdetId());
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   seed cluster location == " << theBase << std::endl;
 
  // Get number of crystals 2sigma above noise in seed basiccluster
  int nCryGT2Sigma = nCrystalsGT2Sigma(*seedC, rhc);
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   nCryGT2Sigma " << nCryGT2Sigma << std::endl;
 
  // Supercluster enery - seed basiccluster energy
  float bremsEnergy = cl.energy() - seedC->energy();
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   bremsEnergy " << bremsEnergy << std::endl;
 
  //Create the pointer ot class SuperClusterShapeAlgo
  //which calculates phiWidth and etaWidth
  SuperClusterShapeAlgo SCShape(&rhc, geometry);
 
  double phiWidth = 0.;
  double etaWidth = 0.;
  //Calculate phiWidth & etaWidth for SuperClusters
  SCShape.Calculate_Covariances(cl);
  phiWidth = SCShape.phiWidth();
  etaWidth = SCShape.etaWidth();
 
  // Calculate the new supercluster energy
  //as a function of number of crystals in the seed basiccluster for Endcap
  //or apply new Enegry SCale correction
  float newEnergy = 0;
 
  reco::SuperCluster tmp = cl;
  tmp.setPhiWidth(phiWidth);
  tmp.setEtaWidth(etaWidth);
 
  if (theAlgo == reco::CaloCluster::hybrid || theAlgo == reco::CaloCluster::dynamicHybrid) {
    if (energyCorrectorName_ == "EcalClusterEnergyCorrection")
      newEnergy = tmp.rawEnergy() + energyCorrectionFunction->getValue(tmp, modeEB_);
    if (energyCorrectorName_ == "EcalClusterEnergyCorrectionObjectSpecific") {
      //std::cout << "newEnergy="<<newEnergy<<std::endl;
      newEnergy = energyCorrectionFunction->getValue(tmp, modeEB_);
    }
 
  } else if (theAlgo == reco::CaloCluster::multi5x5) {
    if (energyCorrectorName_ == "EcalClusterEnergyCorrection")
      newEnergy = tmp.rawEnergy() + tmp.preshowerEnergy() + energyCorrectionFunction->getValue(tmp, modeEE_);
    if (energyCorrectorName_ == "EcalClusterEnergyCorrectionObjectSpecific")
      newEnergy = energyCorrectionFunction->getValue(tmp, modeEE_);
 
  } else {
    //Apply f(nCry) correction on island algo and fixedMatrix algo
    newEnergy = seedC->energy() / fNCrystals(nCryGT2Sigma, theAlgo, theBase) + bremsEnergy;
  }
 
  // Create a new supercluster with the corrected energy
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   UNCORRECTED SC has energy... " << cl.energy() << std::endl;
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "   CORRECTED SC has energy... " << newEnergy << std::endl;
 
  reco::SuperCluster corrCl = cl;
 
  corrCl.setEnergy(newEnergy);
  corrCl.setPhiWidth(phiWidth);
  corrCl.setEtaWidth(etaWidth);
 
  return corrCl;
}

References SuperClusterShapeAlgo::Calculate_Covariances(), GetRecoTauVFromDQM_MC_cff::cl, reco::CaloCluster::dynamicHybrid, SuperClusterShapeAlgo::etaWidth(), fNCrystals(), EcalClusterFunctionBaseClass::getValue(), reco::CaloCluster::hybrid, LogTrace, reco::CaloCluster::multi5x5, nCrystalsGT2Sigma(), SuperClusterShapeAlgo::phiWidth(), reco::CaloCluster::setEnergy(), reco::SuperCluster::setEtaWidth(), reco::SuperCluster::setPhiWidth(), and createJobs::tmp.

applyCrackCorrection()

reco::SuperCluster EgammaSCEnergyCorrectionAlgo::applyCrackCorrection	(	const reco::SuperCluster &	cl,
		EcalClusterFunctionBaseClass *	crackCorrectionFunction
	)

Definition at line 219 of file EgammaSCEnergyCorrectionAlgo.cc.

                                                                                       {
  double crackcor = 1.;
 
  for (reco::CaloCluster_iterator cIt = cl.clustersBegin(); cIt != cl.clustersEnd(); ++cIt) {
    const reco::CaloClusterPtr cc = *cIt;
    crackcor *= ((cl.rawEnergy() + cc->energy() * (crackCorrectionFunction->getValue(*cc) - 1.)) / cl.rawEnergy());
  }  // loop on BCs
 
  reco::SuperCluster corrCl = cl;
  corrCl.setEnergy(cl.energy() * crackcor);
 
  return corrCl;
}

References GetRecoTauVFromDQM_MC_cff::cl, EcalClusterFunctionBaseClass::getValue(), and reco::CaloCluster::setEnergy().

applyLocalContCorrection()

reco::SuperCluster EgammaSCEnergyCorrectionAlgo::applyLocalContCorrection	(	const reco::SuperCluster &	cl,
		EcalClusterFunctionBaseClass *	localContCorrectionFunction
	)

Definition at line 237 of file EgammaSCEnergyCorrectionAlgo.cc.

                                                                                           {
  const EcalRecHitCollection dummy;
 
  const reco::CaloClusterPtr& seedBC = cl.seed();
  float seedBCene = seedBC->energy();
  float correctedSeedBCene = localContCorrectionFunction->getValue(*seedBC, dummy) * seedBCene;
 
  reco::SuperCluster correctedSC = cl;
  correctedSC.setEnergy(cl.energy() - seedBCene + correctedSeedBCene);
 
  return correctedSC;
}

References GetRecoTauVFromDQM_MC_cff::cl, EcalClusterFunctionBaseClass::getValue(), and reco::CaloCluster::setEnergy().

fNCrystals()

float EgammaSCEnergyCorrectionAlgo::fNCrystals ( int  nCry, reco::CaloCluster::AlgoId  theAlgo, EcalSubdetector  theBase  ) const

private

Definition at line 113 of file EgammaSCEnergyCorrectionAlgo.cc.

                                                                              {
  float p0 = 0, p1 = 0, p2 = 0, p3 = 0, p4 = 0;
  float x = nCry;
  float result = 1.f;
 
  if ((theBase == EcalBarrel) && (theAlgo == reco::CaloCluster::hybrid)) {
    if (nCry <= 10) {
      p0 = 6.32879e-01f;
      p1 = 1.14893e-01f;
      p2 = -2.45705e-02f;
      p3 = 2.53074e-03f;
      p4 = -9.29654e-05f;
    } else if (nCry > 10 && nCry <= 30) {
      p0 = 6.93196e-01f;
      p1 = 4.44034e-02f;
      p2 = -2.82229e-03f;
      p3 = 8.19495e-05f;
      p4 = -8.96645e-07f;
    } else {
      p0 = 5.65474e+00f;
      p1 = -6.31640e-01f;
      p2 = 3.14218e-02f;
      p3 = -6.84256e-04f;
      p4 = 5.50659e-06f;
    }
    if (x > 40.f)
      x = 40.f;
  }
 
  else if ((theBase == EcalEndcap) && (theAlgo == reco::CaloCluster::hybrid)) {
    LogTrace("EgammaSCEnergyCorrectionAlgo") << "ERROR! HybridEFRYsc called" << std::endl;
 
    return 1.f;
  }
 
  else if ((theBase == EcalBarrel) && (theAlgo == reco::CaloCluster::island)) {
    p0 = 4.69976e-01f;  // extracted from fit to all endcap classes with Ebrem = 0.
    p1 = 1.45900e-01f;
    p2 = -1.61359e-02f;
    p3 = 7.99423e-04f;
    p4 = -1.47873e-05f;
    if (x > 16.f)
      x = 16.f;
  }
 
  else if ((theBase == EcalEndcap) && (theAlgo == reco::CaloCluster::island)) {
    p0 = 4.69976e-01f;  // extracted from fit to all endcap classes with Ebrem = 0.
    p1 = 1.45900e-01f;
    p2 = -1.61359e-02f;
    p3 = 7.99423e-04f;
    p4 = -1.47873e-05f;
    if (x > 16.f)
      x = 16.f;
  }
 
  else {
    LogTrace("EgammaSCEnergyCorrectionAlgo") << "trying to correct unknown cluster!!!" << std::endl;
    return 1.f;
  }
  result = p0 + x * (p1 + x * (p2 + x * (p3 + x * p4)));
 
  //Rescale energy scale correction to take into account change in calibrated
  //RecHit definition introduced in CMSSW_1_5_0
  float const ebfact = 1.f / 0.965f;
  float const eefact = 1.f / 0.975f;
 
  if (theBase == EcalBarrel) {
    result *= ebfact;
  } else {
    result *= eefact;
  }
 
  return result;
}

References EcalBarrel, EcalEndcap, f, reco::CaloCluster::hybrid, reco::CaloCluster::island, LogTrace, p1, p2, p3, p4, mps_fire::result, and x.

Referenced by applyCorrection().

nCrystalsGT2Sigma()

int EgammaSCEnergyCorrectionAlgo::nCrystalsGT2Sigma ( reco::BasicCluster const &  seed, EcalRecHitCollection const &  rhc  ) const

private

Definition at line 190 of file EgammaSCEnergyCorrectionAlgo.cc.

                                                                                           {
  // return number of crystals 2Sigma above
  // electronic noise
 
  std::vector<std::pair<DetId, float> > const& hits = seed.hitsAndFractions();
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "      EgammaSCEnergyCorrectionAlgo::nCrystalsGT2Sigma" << std::endl;
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "      Will calculate number of crystals above 2sigma noise" << std::endl;
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "      sigmaElectronicNoise = " << sigmaElectronicNoise_ << std::endl;
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "      There are " << hits.size() << " recHits" << std::endl;
 
  int nCry = 0;
  std::vector<std::pair<DetId, float> >::const_iterator hit;
  EcalRecHitCollection::const_iterator aHit;
  for (hit = hits.begin(); hit != hits.end(); hit++) {
    // need to get hit by DetID in order to get energy
    aHit = rhc.find((*hit).first);
    if ((*aHit).energy() > 2.f * sigmaElectronicNoise_)
      nCry++;
  }
 
  LogTrace("EgammaSCEnergyCorrectionAlgo") << "         " << nCry << " of these above 2sigma noise" << std::endl;
 
  return nCry;
}

References edm::SortedCollection< T, SORT >::find(), hfClusterShapes_cfi::hits, LogTrace, SurveyInfoScenario_cff::seed, and sigmaElectronicNoise_.

Referenced by applyCorrection().

Member Data Documentation

sigmaElectronicNoise_

float EgammaSCEnergyCorrectionAlgo::sigmaElectronicNoise_

private

Definition at line 54 of file EgammaSCEnergyCorrectionAlgo.h.

Referenced by EgammaSCEnergyCorrectionAlgo(), and nCrystalsGT2Sigma().

theAlgo_

reco::CaloCluster::AlgoId EgammaSCEnergyCorrectionAlgo::theAlgo_

private

Definition at line 56 of file EgammaSCEnergyCorrectionAlgo.h.