#include <ShiftedPFCandidateProducerForNoPileUpPFMEt.h>

Inheritance diagram for ShiftedPFCandidateProducerForNoPileUpPFMEt:

Public Member Functions
	ShiftedPFCandidateProducerForNoPileUpPFMEt (const edm::ParameterSet &)

	~ShiftedPFCandidateProducerForNoPileUpPFMEt ()

Public Member Functions inherited from edm::EDProducer
	EDProducer ()

virtual	~EDProducer ()

Public Member Functions inherited from edm::ProducerBase
	ProducerBase ()

void	registerProducts (ProducerBase , ProductRegistry , ModuleDescription const &)

boost::function< void(const BranchDescription &)>	registrationCallback () const
	used by the fwk to register list of products More...

virtual	~ProducerBase ()

Private Member Functions
void	produce (edm::Event &, const edm::EventSetup &)

Private Attributes
JetCorrectionUncertainty *	jecUncertainty_

edm::FileInPath	jetCorrInputFileName_

JetCorrectorParameters *	jetCorrParameters_

std::string	jetCorrPayloadName_

std::string	jetCorrUncertaintyTag_

double	minJetPt_

std::string	moduleLabel_

double	shiftBy_

edm::InputTag	srcJets_

edm::InputTag	srcPFCandidates_

double	unclEnUncertainty_

Additional Inherited Members
Public Types inherited from edm::EDProducer
typedef EDProducer	ModuleType

typedef WorkerT< EDProducer >	WorkerType

Public Types inherited from edm::ProducerBase
typedef ProductRegistryHelper::TypeLabelList	TypeLabelList

Static Public Member Functions inherited from edm::EDProducer
static const std::string &	baseType ()

static void	fillDescriptions (ConfigurationDescriptions &descriptions)

static void	prevalidate (ConfigurationDescriptions &descriptions)

Protected Member Functions inherited from edm::EDProducer
CurrentProcessingContext const *	currentContext () const

Protected Member Functions inherited from edm::ProducerBase
template<class TProducer , class TMethod >
void	callWhenNewProductsRegistered (TProducer *iProd, TMethod iMethod)

Detailed Description

Vary energy of PFCandidates which are (are not) within jets of Pt > 10 GeV by jet energy uncertainty (by 10% "unclustered" energy uncertainty)

NOTE: Auxiliary class specific to estimating systematic uncertainty on PFMET reconstructed by no-PU MET reconstruction algorithm (implemented in JetMETCorrections/Type1MET/src/NoPileUpPFMETProducer.cc)

In case all PFCandidates not within jets of Pt > 30 GeV would be varied by the 10% "unclustered" energy uncertainty, the systematic uncertainty on the reconstructed no-PU MET would be overestimated significantly !!

Author: Christian Veelken, LLR

Version

Revision:: 1.1

Id:: ShiftedPFCandidateProducerForNoPileUpPFMEt.h,v 1.1 2012/08/31 10:06:13 veelken Exp

Definition at line 40 of file ShiftedPFCandidateProducerForNoPileUpPFMEt.h.

Constructor & Destructor Documentation

ShiftedPFCandidateProducerForNoPileUpPFMEt::ShiftedPFCandidateProducerForNoPileUpPFMEt ( const edm::ParameterSet & cfg )

explicit

Definition at line 14 of file ShiftedPFCandidateProducerForNoPileUpPFMEt.cc.

References gather_cfg::cout, edm::ParameterSet::exists(), edm::FileInPath::fullPath(), edm::ParameterSet::getParameter(), jecUncertainty_, jetCorrInputFileName_, jetCorrParameters_, jetCorrPayloadName_, jetCorrUncertaintyTag_, edm::FileInPath::location(), minJetPt_, shiftBy_, srcJets_, srcPFCandidates_, unclEnUncertainty_, and edm::FileInPath::Unknown.

   : moduleLabel_(cfg.getParameter<std::string>("@module_label"))
 {
   srcPFCandidates_ = cfg.getParameter<edm::InputTag>("srcPFCandidates");
   srcJets_ = cfg.getParameter<edm::InputTag>("srcJets");
 
   jetCorrUncertaintyTag_ = cfg.getParameter<std::string>("jetCorrUncertaintyTag");
   if ( cfg.exists("jetCorrInputFileName") ) {
     jetCorrInputFileName_ = cfg.getParameter<edm::FileInPath>("jetCorrInputFileName");
     if ( jetCorrInputFileName_.location() == edm::FileInPath::Unknown) throw cms::Exception("ShiftedJetProducerT") 
       << " Failed to find JEC parameter file = " << jetCorrInputFileName_ << " !!\n";
     std::cout << "Reading JEC parameters = " << jetCorrUncertaintyTag_  
           << " from file = " << jetCorrInputFileName_.fullPath() << "." << std::endl;
     jetCorrParameters_ = new JetCorrectorParameters(jetCorrInputFileName_.fullPath().data(), jetCorrUncertaintyTag_);
     jecUncertainty_ = new JetCorrectionUncertainty(*jetCorrParameters_);
   } else {
     std::cout << "Reading JEC parameters = " << jetCorrUncertaintyTag_
           << " from DB/SQLlite file." << std::endl;
     jetCorrPayloadName_ = cfg.getParameter<std::string>("jetCorrPayloadName");
   }
 
   minJetPt_ = cfg.getParameter<double>("minJetPt");
 
   shiftBy_ = cfg.getParameter<double>("shiftBy");
   
   unclEnUncertainty_ = cfg.getParameter<double>("unclEnUncertainty");
 
   produces<reco::PFCandidateCollection>();
 }

ShiftedPFCandidateProducerForNoPileUpPFMEt::~ShiftedPFCandidateProducerForNoPileUpPFMEt ( )

Definition at line 44 of file ShiftedPFCandidateProducerForNoPileUpPFMEt.cc.

 {
 // nothing to be done yet...
 }

Member Function Documentation

void ShiftedPFCandidateProducerForNoPileUpPFMEt::produce	(	edm::Event &	evt,
		const edm::EventSetup &	es
	)

privatevirtual

Implements edm::EDProducer.

Definition at line 49 of file ShiftedPFCandidateProducerForNoPileUpPFMEt.cc.

References deltaR(), alignCSCRings::e, reco::LeafCandidate::eta(), edm::EventSetup::get(), edm::Event::getByLabel(), reco::PFJet::getPFConstituents(), JetCorrectionUncertainty::getUncertainty(), jecUncertainty_, metsig::jet, jetCorrPayloadName_, jetCorrUncertaintyTag_, fwrapper::jets, minJetPt_, reco::LeafCandidate::pt(), edm::Event::put(), JetCorrectionUncertainty::setJetEta(), JetCorrectionUncertainty::setJetPt(), reco::LeafCandidate::setP4(), edm::shift, shiftBy_, srcJets_, srcPFCandidates_, and unclEnUncertainty_.

 {
   edm::Handle<reco::PFCandidateCollection> originalPFCandidates;
   evt.getByLabel(srcPFCandidates_, originalPFCandidates);
 
   edm::Handle<reco::PFJetCollection> jets;
   evt.getByLabel(srcJets_, jets);
 
   std::vector<const reco::PFJet*> selectedJets;
   for ( reco::PFJetCollection::const_iterator jet = jets->begin();
     jet != jets->end(); ++jet ) {
     if ( jet->pt() > minJetPt_ ) selectedJets.push_back(&(*jet));
   }
 
   if ( jetCorrPayloadName_ != "" ) {
       edm::ESHandle<JetCorrectorParametersCollection> jetCorrParameterSet;
       es.get<JetCorrectionsRecord>().get(jetCorrPayloadName_, jetCorrParameterSet); 
       const JetCorrectorParameters& jetCorrParameters = (*jetCorrParameterSet)[jetCorrUncertaintyTag_];
       delete jecUncertainty_;
       jecUncertainty_ = new JetCorrectionUncertainty(jetCorrParameters);
     }
 
   std::auto_ptr<reco::PFCandidateCollection> shiftedPFCandidates(new reco::PFCandidateCollection);
 
   for ( reco::PFCandidateCollection::const_iterator originalPFCandidate = originalPFCandidates->begin();
     originalPFCandidate != originalPFCandidates->end(); ++originalPFCandidate ) {
     
     const reco::PFJet* jet_matched = 0;
     for ( std::vector<const reco::PFJet*>::iterator jet = selectedJets.begin();
       jet != selectedJets.end(); ++jet ) {
       std::vector<reco::PFCandidatePtr> jetConstituents = (*jet)->getPFConstituents();
       for ( std::vector<reco::PFCandidatePtr>::const_iterator jetConstituent = jetConstituents.begin();
         jetConstituent != jetConstituents.end() && !jet_matched; ++jetConstituent ) {
     if ( deltaR(originalPFCandidate->p4(), (*jetConstituent)->p4()) < 1.e-2 ) jet_matched = (*jet);
       }
     }
 
     double shift = 0.;
     if ( jet_matched ) {
       jecUncertainty_->setJetEta(jet_matched->eta());
       jecUncertainty_->setJetPt(jet_matched->pt());
       
       shift = jecUncertainty_->getUncertainty(true);
     } else {
       shift = unclEnUncertainty_;
     }
 
     shift *= shiftBy_;
     
     reco::Candidate::LorentzVector shiftedPFCandidateP4 = originalPFCandidate->p4();
     shiftedPFCandidateP4 *= (1. + shift);
     
     reco::PFCandidate shiftedPFCandidate(*originalPFCandidate);      
     shiftedPFCandidate.setP4(shiftedPFCandidateP4);
     
     shiftedPFCandidates->push_back(shiftedPFCandidate);
   }
   
   evt.put(shiftedPFCandidates);
 }