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#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "DataFormats/JetReco/interface/GenJetCollection.h"
#include "DataFormats/Math/interface/deltaPhi.h"
#include "DataFormats/Math/interface/deltaR.h"
#include "DataFormats/Math/interface/LorentzVector.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/global/EDFilter.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/EDGetToken.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include <cmath>
#include <cstdlib>
#include <vector>
class VBFGenJetFilter : public edm::global::EDFilter<> {
public:
explicit VBFGenJetFilter(const edm::ParameterSet&);
bool filter(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
private:
std::vector<const reco::GenJet*> filterGenJets(const std::vector<reco::GenJet>* jets) const;
std::vector<const reco::GenParticle*> filterGenLeptons(const std::vector<reco::GenParticle>* particles) const;
// Dijet cut
const bool oppositeHemisphere;
const bool leadJetsNoLepMass;
const double ptMin;
const double etaMin;
const double etaMax;
const double minInvMass;
const double maxInvMass;
const double minDeltaPhi;
const double maxDeltaPhi;
const double minDeltaEta;
const double maxDeltaEta;
const double minLeadingJetsInvMass;
const double maxLeadingJetsInvMass;
const double deltaRJetLep;
// Input tags
edm::EDGetTokenT<reco::GenJetCollection> m_inputTag_GenJetCollection;
edm::EDGetTokenT<reco::GenParticleCollection> m_inputTag_GenParticleCollection;
};
using namespace std;
VBFGenJetFilter::VBFGenJetFilter(const edm::ParameterSet& iConfig)
: oppositeHemisphere(iConfig.getUntrackedParameter<bool>("oppositeHemisphere", false)),
leadJetsNoLepMass(iConfig.getUntrackedParameter<bool>("leadJetsNoLepMass", false)),
ptMin(iConfig.getUntrackedParameter<double>("minPt", 20)),
etaMin(iConfig.getUntrackedParameter<double>("minEta", -5.0)),
etaMax(iConfig.getUntrackedParameter<double>("maxEta", 5.0)),
minInvMass(iConfig.getUntrackedParameter<double>("minInvMass", 0.0)),
maxInvMass(iConfig.getUntrackedParameter<double>("maxInvMass", 99999.0)),
minDeltaPhi(iConfig.getUntrackedParameter<double>("minDeltaPhi", -1.0)),
maxDeltaPhi(iConfig.getUntrackedParameter<double>("maxDeltaPhi", 99999.0)),
minDeltaEta(iConfig.getUntrackedParameter<double>("minDeltaEta", -1.0)),
maxDeltaEta(iConfig.getUntrackedParameter<double>("maxDeltaEta", 99999.0)),
minLeadingJetsInvMass(iConfig.getUntrackedParameter<double>("minLeadingJetsInvMass", 0.0)),
maxLeadingJetsInvMass(iConfig.getUntrackedParameter<double>("maxLeadingJetsInvMass", 99999.0)),
deltaRJetLep(iConfig.getUntrackedParameter<double>("deltaRJetLep", 0.3)) {
m_inputTag_GenJetCollection = consumes<reco::GenJetCollection>(
iConfig.getUntrackedParameter<edm::InputTag>("inputTag_GenJetCollection", edm::InputTag("ak5GenJetsNoNu")));
if (leadJetsNoLepMass)
m_inputTag_GenParticleCollection = consumes<reco::GenParticleCollection>(
iConfig.getUntrackedParameter<edm::InputTag>("genParticles", edm::InputTag("genParticles")));
}
vector<const reco::GenParticle*> VBFGenJetFilter::filterGenLeptons(const vector<reco::GenParticle>* particles) const {
vector<const reco::GenParticle*> out;
for (const auto& p : *particles) {
int absPdgId = std::abs(p.pdgId());
if (((absPdgId == 11) || (absPdgId == 13) || (absPdgId == 15)) && p.isHardProcess()) {
out.push_back(&p);
}
}
return out;
}
vector<const reco::GenJet*> VBFGenJetFilter::filterGenJets(const vector<reco::GenJet>* jets) const {
vector<const reco::GenJet*> out;
for (unsigned i = 0; i < jets->size(); i++) {
const reco::GenJet* j = &((*jets)[i]);
if (j->p4().pt() > ptMin && j->p4().eta() > etaMin && j->p4().eta() < etaMax) {
out.push_back(j);
}
}
return out;
}
// ------------ method called to skim the data ------------
bool VBFGenJetFilter::filter(edm::StreamID, edm::Event& iEvent, const edm::EventSetup&) const {
edm::Handle<vector<reco::GenJet> > handleGenJets;
iEvent.getByToken(m_inputTag_GenJetCollection, handleGenJets);
const vector<reco::GenJet>* genJets = handleGenJets.product();
// Getting filtered generator jets
vector<const reco::GenJet*> filGenJets = filterGenJets(genJets);
// If we do not find at least 2 jets veto the event
if (filGenJets.size() < 2) {
return false;
}
// Testing dijet mass
if (leadJetsNoLepMass) {
edm::Handle<reco::GenParticleCollection> genParticelesCollection;
iEvent.getByToken(m_inputTag_GenParticleCollection, genParticelesCollection);
const vector<reco::GenParticle>* genParticles = genParticelesCollection.product();
// Getting filtered generator muons
vector<const reco::GenParticle*> filGenLep = filterGenLeptons(genParticles);
// Getting p4 of jet with no lepton
vector<math::XYZTLorentzVector> genJetsWithoutLeptonsP4;
unsigned int jetIdx = 0;
while (genJetsWithoutLeptonsP4.size() < 2 && jetIdx < filGenJets.size()) {
bool jetWhitoutLep = true;
const math::XYZTLorentzVector& p4J = (filGenJets[jetIdx])->p4();
for (unsigned int i = 0; i < filGenLep.size() && jetWhitoutLep; ++i) {
if (reco::deltaR2((filGenLep[i])->p4(), p4J) < deltaRJetLep * deltaRJetLep)
jetWhitoutLep = false;
}
if (jetWhitoutLep)
genJetsWithoutLeptonsP4.push_back(p4J);
++jetIdx;
}
// Checking the invariant mass of the leading jets
if (genJetsWithoutLeptonsP4.size() < 2)
return false;
float invMassLeadingJet = (genJetsWithoutLeptonsP4[0] + genJetsWithoutLeptonsP4[1]).M();
if (invMassLeadingJet > minLeadingJetsInvMass && invMassLeadingJet < maxLeadingJetsInvMass)
return true;
else
return false;
}
for (unsigned a = 0; a < filGenJets.size(); a++) {
for (unsigned b = a + 1; b < filGenJets.size(); b++) {
const reco::GenJet* pA = filGenJets[a];
const reco::GenJet* pB = filGenJets[b];
// Getting the dijet vector
math::XYZTLorentzVector diJet = pA->p4() + pB->p4();
// Testing opposite hemispheres
double dijetProd = pA->p4().eta() * pB->p4().eta();
if (oppositeHemisphere && dijetProd >= 0) {
continue;
}
// Testing dijet mass
double invMass = diJet.mass();
if (invMass <= minInvMass || invMass > maxInvMass) {
continue;
}
// Testing dijet delta eta
double dEta = fabs(pA->p4().eta() - pB->p4().eta());
if (dEta <= minDeltaEta || dEta > maxDeltaEta) {
continue;
}
// Testing dijet delta phi
double dPhi = fabs(reco::deltaPhi(pA->p4().phi(), pB->p4().phi()));
if (dPhi <= minDeltaPhi || dPhi > maxDeltaPhi) {
continue;
}
return true;
}
}
return false;
}
//define this as a plug-in
DEFINE_FWK_MODULE(VBFGenJetFilter);
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