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/*
Package: GeneralInterface/GenFilters/GenHTFilter
Class: GenHTFilter
class GenHTFilter GenHTFilter.cc GeneratorInterface/GenFilters/src/GenHTFilter.cc
Description: EDFilter which firstly calculates the generated HT (genHT) from GenJets (given a HT definition) and then filters the events on the generator level (given a certain genHT cut).
Implementation:
The following input parameters are used (found in the genHTFilter_cfi configuration file fragment used for module initalisation):
src = cms.InputTag("X") : GenJet collection label as input
jetPtCut = cms.double(#) : GenJet pT cut for HT
jetEtaCut = cms.double(#) : GenJet eta cut for HT
genHTcut = cms.double(#) : GenHT cut
Original Author: Mateusz Zarucki
Created: Oct 2015
*/
//System include files
#include <memory>
#include <vector>
//User include files
#include "FWCore/Framework/interface/global/EDFilter.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/JetReco/interface/GenJetCollection.h"
//Class declaration
class GenHTFilter : public edm::global::EDFilter<> {
public:
explicit GenHTFilter(const edm::ParameterSet&);
private:
bool filter(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
//Member data
const edm::EDGetTokenT<reco::GenJetCollection> token_;
const double jetPtCut_, jetEtaCut_, genHTcut_;
};
//Constructor
GenHTFilter::GenHTFilter(const edm::ParameterSet& params)
: token_(consumes<reco::GenJetCollection>(params.getParameter<edm::InputTag>("src"))),
jetPtCut_(params.getParameter<double>("jetPtCut")),
jetEtaCut_(params.getParameter<double>("jetEtaCut")),
genHTcut_(params.getParameter<double>("genHTcut")) {}
bool GenHTFilter::filter(edm::StreamID, edm::Event& evt, const edm::EventSetup& params) const {
using namespace std;
using namespace edm;
using namespace reco;
//Read GenJets Collection from Event
edm::Handle<reco::GenJetCollection> generatedJets;
evt.getByToken(token_, generatedJets);
//Loop over all jets in Event and calculate genHT
double genHT = 0.0;
for (std::vector<reco::GenJet>::const_iterator it = generatedJets->begin(); it != generatedJets->end(); ++it) {
const reco::GenJet& gjet = *it;
//Add GenJet pt to genHT if GenJet complies with given HT definition
if (gjet.pt() > jetPtCut_ && abs(gjet.eta()) < jetEtaCut_) {
genHT += gjet.pt();
}
}
return (genHT > genHTcut_); //Return boolean whether genHT passes cut value
}
// Define module as a plug-in
DEFINE_FWK_MODULE(GenHTFilter);
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