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//
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// $Id: ObjectSpatialResolution.h,v 1.1 2008/03/06 09:23:10 llista Exp $
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//
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#ifndef PhysicsTools_PatAlgos_ObjectSpatialResolution_h
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#define PhysicsTools_PatAlgos_ObjectSpatialResolution_h
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/**
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\class pat::ObjectSpatialResolution ObjectSpatialResolution.h "PhysicsTools/PatAlgos/interface/ObjectSpatialResolution.h"
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\brief Energy scale shifting and smearing module
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This class provides angular smearing to objects with resolutions for
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systematic error studies.
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A detailed documentation is found in
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PhysicsTools/PatAlgos/data/ObjectSpatialResolution.cfi
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\author Volker Adler
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\version $Id: ObjectSpatialResolution.h,v 1.1 2008/03/06 09:23:10 llista Exp $
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*/
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#include <cmath>
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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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#include "DataFormats/Math/interface/normalizedPhi.h"
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#include <cmath>
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namespace pat {
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template<class T>
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class ObjectSpatialResolution : public edm::EDProducer {
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public:
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explicit ObjectSpatialResolution(const edm::ParameterSet& iConfig);
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~ObjectSpatialResolution();
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private:
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virtual void produce(edm::Event& iEvent, const edm::EventSetup& iSetup);
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void smearAngles(T& object);
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edm::InputTag objects_;
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double iniResPolar_,
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worsenResPolar_,
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iniResPhi_,
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worsenResPhi_;
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bool useDefaultIniRes_,
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usePolarTheta_,
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useWorsenResPolarByFactor_,
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useWorsenResPhiByFactor_;
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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::ObjectSpatialResolution<T>::ObjectSpatialResolution(const edm::ParameterSet& iConfig)
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{
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objects_ = iConfig.getParameter<edm::InputTag>("movedObject");
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useDefaultIniRes_ = iConfig.getParameter<bool> ("useDefaultInitialResolutions");
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iniResPhi_ = iConfig.getParameter<double> ("initialResolutionPhi");
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worsenResPhi_ = iConfig.getParameter<double> ("worsenResolutionPhi");
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useWorsenResPhiByFactor_ = iConfig.getParameter<bool> ("worsenResolutionPhiByFactor");
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usePolarTheta_ = iConfig.getParameter<bool> ("usePolarTheta");
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iniResPolar_ = iConfig.getParameter<double> ("initialResolutionPolar");
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worsenResPolar_ = iConfig.getParameter<double> ("worsenResolutionPolar");
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useWorsenResPolarByFactor_ = iConfig.getParameter<bool> ("worsenResolutionPolarByFactor");
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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::ObjectSpatialResolution<T>::~ObjectSpatialResolution()
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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::ObjectSpatialResolution<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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smearAngles(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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/// Sets initial resolution to resolution provided by input object if required,
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/// smears eta/theta and phi and sets the 4-vector accordingl.
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template<class T>
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void pat::ObjectSpatialResolution<T>::smearAngles(T& object)
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{
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// overwrite config file parameters 'initialResolution...' if required
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if ( useDefaultIniRes_ ) {
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// get initial resolutions from input object
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iniResPhi_ = object.resolutionPhi(); // overwrites config file parameter "initialResolution"
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iniResPolar_ = usePolarTheta_ ?
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object.resolutionTheta():
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object.resolutionEta(); // overwrites config file parameter "initialResolution"
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}
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// smear phi
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double finalResPhi = useWorsenResPhiByFactor_ ?
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(1.+fabs(1.-fabs(worsenResPhi_))) * fabs(iniResPhi_):
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fabs(worsenResPhi_) + fabs(iniResPhi_); // conversions as protection from "finalRes_<iniRes_"
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double smearedPhi = normalizedPhi( gaussian_->fire(object.phi(), sqrt(pow(finalResPhi,2)-pow(iniResPhi_,2))) );
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double finalResPolar = useWorsenResPolarByFactor_ ?
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(1.+fabs(1.-fabs(worsenResPolar_))) * fabs(iniResPolar_):
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fabs(worsenResPolar_) + fabs(iniResPolar_); // conversions as protection from "finalRes_<iniRes_"
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// smear theta/eta
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const double thetaMin = 2.*atan(exp(-ROOT::Math::etaMax<double>())); // to be on the safe side; however, etaMax=22765 ==> thetaMin=0 within double precision
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double smearedTheta,
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smearedEta;
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if ( usePolarTheta_ ) {
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smearedTheta = gaussian_->fire(object.theta(), sqrt(pow(finalResPolar,2)-pow(iniResPolar_,2)));
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// 0<theta<Pi needs to be assured to have proper calculation of eta
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while ( fabs(smearedTheta) > M_PI ) smearedTheta = smearedTheta < 0. ?
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smearedTheta + 2.*M_PI:
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smearedTheta - 2.*M_PI;
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if ( smearedTheta < 0. ) {
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smearedTheta = -smearedTheta;
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smearedPhi = normalizedPhi(smearedPhi+M_PI);
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}
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smearedEta = smearedTheta < thetaMin ?
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ROOT::Math::etaMax<double>() :
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( smearedTheta > M_PI-thetaMin ?
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-ROOT::Math::etaMax<double>():
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-log(tan(smearedTheta/2.)) ); // eta not calculable for theta=0,Pi, which could occur
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} else {
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smearedEta = gaussian_->fire(object.eta(), sqrt(pow(finalResPolar,2)-pow(iniResPolar_,2)));
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if ( fabs(smearedEta) > ROOT::Math::etaMax<double>() ) smearedEta = smearedEta < 0. ?
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-ROOT::Math::etaMax<double>():
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ROOT::Math::etaMax<double>();
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smearedTheta = 2. * atan(exp(-smearedEta)); // since exp(x)>0 && atan() returns solution closest to 0, 0<theta<Pi should be assured.
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}
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// set smeared new 4-vector
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math::PtEtaPhiELorentzVector newLorentzVector(object.p()*sin(smearedTheta),
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smearedEta,
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smearedPhi,
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object.energy());
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object.setP4(reco::Particle::LorentzVector(newLorentzVector.Px(),
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newLorentzVector.Py(),
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newLorentzVector.Pz(),
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newLorentzVector.E() ));
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}
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#endif
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