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#include "EgammaAnalysis/ElectronTools/interface/PhotonEnergyCalibratorRun2.h"
#include <CLHEP/Random/RandGaussQ.h>
#include "FWCore/AbstractServices/interface/RandomNumberGenerator.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/Exception.h"
PhotonEnergyCalibratorRun2::PhotonEnergyCalibratorRun2(bool isMC, bool synchronization, std::string correctionFile)
: isMC_(isMC),
synchronization_(synchronization),
rng_(nullptr),
_correctionRetriever(correctionFile) // here is opening the files and reading thecorrections
{
if (isMC_) {
_correctionRetriever.doScale = false;
_correctionRetriever.doSmearings = true;
} else {
_correctionRetriever.doScale = true;
_correctionRetriever.doSmearings = false;
}
}
PhotonEnergyCalibratorRun2::~PhotonEnergyCalibratorRun2() {}
void PhotonEnergyCalibratorRun2::initPrivateRng(TRandom *rnd) { rng_ = rnd; }
void PhotonEnergyCalibratorRun2::calibrate(reco::Photon &photon,
unsigned int runNumber,
edm::StreamID const &id) const {
SimplePhoton simple(photon, runNumber, isMC_);
calibrate(simple, id);
simple.writeTo(photon);
}
void PhotonEnergyCalibratorRun2::calibrate(SimplePhoton &photon, edm::StreamID const &id) const {
assert(isMC_ == photon.isMC());
float smear = 0.0, scale = 1.0;
float aeta = std::abs(photon.getEta()); //, r9 = photon.getR9();
float et = photon.getNewEnergy() / cosh(aeta);
scale = _correctionRetriever.ScaleCorrection(photon.getRunNumber(), photon.isEB(), photon.getR9(), aeta, et);
smear = _correctionRetriever.getSmearingSigma(photon.getRunNumber(), photon.isEB(), photon.getR9(), aeta, et, 0., 0.);
double newEcalEnergy, newEcalEnergyError;
if (isMC_) {
double corr = 1.0 + smear * gauss(id);
newEcalEnergy = photon.getNewEnergy() * corr;
newEcalEnergyError = std::hypot(photon.getNewEnergyError() * corr, smear * newEcalEnergy);
} else {
newEcalEnergy = photon.getNewEnergy() * scale;
newEcalEnergyError = std::hypot(photon.getNewEnergyError() * scale, smear * newEcalEnergy);
}
photon.setNewEnergy(newEcalEnergy);
photon.setNewEnergyError(newEcalEnergyError);
}
double PhotonEnergyCalibratorRun2::gauss(edm::StreamID const &id) const {
if (synchronization_)
return 1.0;
if (rng_) {
return rng_->Gaus();
} else {
edm::Service<edm::RandomNumberGenerator> rng;
if (!rng.isAvailable()) {
throw cms::Exception("Configuration")
<< "XXXXXXX requires the RandomNumberGeneratorService\n"
"which is not present in the configuration file. You must add the service\n"
"in the configuration file or remove the modules that require it.";
}
CLHEP::RandGaussQ gaussDistribution(rng->getEngine(id), 0.0, 1.0);
return gaussDistribution.fire();
}
}
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