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//
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// $Id: ObjectEnergyScale.h,v 1.1 2009/10/20 17:15:14 dgele Exp $
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//
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#ifndef PhysicsTools_PatAlgos_ObjectEnergyScale_h
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#define PhysicsTools_PatAlgos_ObjectEnergyScale_h
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/**
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\class pat::ObjectEnergyScale ObjectEnergyScale.h "PhysicsTools/PatAlgos/interface/ObjectEnergyScale.h"
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\brief Energy scale shifting and smearing module
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This class provides energy scale shifting & smearing to objects with
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resolutions for systematic error studies.
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A detailed documentation is found in
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PhysicsTools/PatAlgos/data/ObjectEnergyScale.cfi
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\author Volker Adler
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\version $Id: ObjectEnergyScale.h,v 1.1 2009/10/20 17:15:14 dgele Exp $
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*/
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#include "FWCore/Framework/interface/Frameworkfwd.h"
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#include "FWCore/Framework/interface/EDProducer.h"
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#include "FWCore/Framework/interface/Event.h"
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#include "FWCore/ParameterSet/interface/ParameterSet.h"
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#include "FWCore/ParameterSet/interface/InputTag.h"
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#include "FWCore/ServiceRegistry/interface/Service.h"
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#include "FWCore/Utilities/interface/RandomNumberGenerator.h"
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#include "CLHEP/Random/RandGaussQ.h"
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namespace pat {
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template<class T>
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class ObjectEnergyScale : public edm::EDProducer {
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public:
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explicit ObjectEnergyScale(const edm::ParameterSet& iConfig);
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~ObjectEnergyScale();
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private:
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virtual void produce( edm::Event& iEvent, const edm::EventSetup& iSetup);
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float getSmearing(T& object);
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void setScale(T& object);
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edm::InputTag objects_;
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float factor_,
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shiftFactor_,
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iniRes_,
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worsenRes_;
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bool useFixedMass_,
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useDefaultIniRes_,
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useIniResByFraction_,
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useWorsenResByFactor_;
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CLHEP::RandGaussQ* gaussian_;
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};
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}
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template<class T>
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pat::ObjectEnergyScale<T>::ObjectEnergyScale(const edm::ParameterSet& iConfig)
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{
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objects_ = iConfig.getParameter<edm::InputTag>("scaledObject");
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useFixedMass_ = iConfig.getParameter<bool> ("fixMass");
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shiftFactor_ = iConfig.getParameter<double> ("shiftFactor");
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useDefaultIniRes_ = iConfig.getParameter<bool> ("useDefaultInitialResolution");
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iniRes_ = iConfig.getParameter<double> ("initialResolution");
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useIniResByFraction_ = iConfig.getParameter<bool> ("initialResolutionByFraction");
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worsenRes_ = iConfig.getParameter<double> ("worsenResolution");
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useWorsenResByFactor_ = iConfig.getParameter<bool> ("worsenResolutionByFactor");
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edm::Service<edm::RandomNumberGenerator> rng;
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CLHEP::HepRandomEngine& engine = rng->getEngine();
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gaussian_ = new CLHEP::RandGaussQ(engine);
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produces<std::vector<T> >();
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}
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template<class T>
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pat::ObjectEnergyScale<T>::~ObjectEnergyScale()
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{
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delete gaussian_;
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}
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template<class T>
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void pat::ObjectEnergyScale<T>::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
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{
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edm::Handle<std::vector<T> > objectsHandle;
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iEvent.getByLabel(objects_, objectsHandle);
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std::vector<T> objects = *objectsHandle;
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std::auto_ptr<std::vector<T> > objectsVector(new std::vector<T>);
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objectsVector->reserve(objectsHandle->size());
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for ( unsigned int i = 0; i < objects.size(); i++ ) {
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factor_ = shiftFactor_ * ( objects[i].energy() > 0. ?
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getSmearing(objects[i]) :
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0.);
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setScale(objects[i]);
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objectsVector->push_back(objects[i]);
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}
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iEvent.put(objectsVector);
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}
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/// Returns a smearing factor which is multiplied to the initial value then to get it smeared,
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/// sets initial resolution to resolution provided by input object if required
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/// and converts the 'worsenResolution' parameter to protect from meaningless final resolution values.
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template<class T>
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float pat::ObjectEnergyScale<T>::getSmearing(T& object)
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{
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// overwrite config file parameter 'initialResolution' if required
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if ( useDefaultIniRes_ ) {
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// get initial resolution from input object (and calculate relative initial resolution from absolute value)
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iniRes_ = (1. / sin(object.theta()) * object.resolutionEt() - object.et() * cos(object.theta()) / pow(sin(object.theta()),2) * object.resolutionTheta()) / object.energy(); // conversion of resEt and resTheta into energy resolution
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} else if ( ! useIniResByFraction_ ) {
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// calculate relative initial resolution from absolute value
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iniRes_ = iniRes_ / object.energy();
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}
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// Is 'worsenResolution' a factor or a summand?
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float finalRes = useWorsenResByFactor_ ?
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(1.+fabs(1.-fabs(worsenRes_))) * fabs(iniRes_) :
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fabs(worsenRes_)/object.energy() + fabs(iniRes_); // conversion as protection from "finalRes_<iniRes_"
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// return smearing factor
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return std::max( gaussian_->fire(1., sqrt(pow(finalRes,2)-pow(iniRes_,2))), 0. ); // protection from negative smearing factors
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}
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/// Mutliplies the final factor (consisting of shifting and smearing factors) to the object's 4-vector
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/// and takes care of preserved masses.
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template<class T>
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void pat::ObjectEnergyScale<T>::setScale(T& object)
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{
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if ( factor_ < 0. ) {
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factor_ = 0.;
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}
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// calculate the momentum factor for fixed or not fixed mass
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float factorMomentum = useFixedMass_ && object.p() > 0. ?
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sqrt(pow(factor_*object.energy(),2)-object.massSqr()) / object.p() :
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factor_;
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// set shifted & smeared new 4-vector
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object.setP4(reco::Particle::LorentzVector(factorMomentum*object.px(),
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factorMomentum*object.py(),
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factorMomentum*object.pz(),
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factor_ *object.energy()));
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}
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#endif
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