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#include <memory>
#include "GeneratorInterface/RivetInterface/interface/ParticleLevelProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "DataFormats/Common/interface/RefToPtr.h"
#include "DataFormats/METReco/interface/METFwd.h"
#include "DataFormats/METReco/interface/MET.h"
#include "RecoJets/JetProducers/interface/JetSpecific.h"
#include "CommonTools/Utils/interface/PtComparator.h"
#include "Rivet/Analysis.hh"
using namespace std;
using namespace edm;
using namespace reco;
using namespace Rivet;
ParticleLevelProducer::ParticleLevelProducer(const edm::ParameterSet& pset)
: srcToken_(consumes<edm::HepMC3Product>(pset.getParameter<edm::InputTag>("src"))), pset_(pset) {
usesResource("Rivet");
genVertex_ = reco::Particle::Point(0, 0, 0);
produces<reco::GenParticleCollection>("neutrinos");
produces<reco::GenParticleCollection>("photons");
produces<reco::GenJetCollection>("leptons");
produces<reco::GenJetCollection>("jets");
produces<reco::GenJetCollection>("fatjets");
produces<reco::GenParticleCollection>("consts");
produces<reco::GenParticleCollection>("tags");
produces<reco::METCollection>("mets");
}
void ParticleLevelProducer::addGenJet(Rivet::Jet jet,
std::unique_ptr<reco::GenJetCollection>& jets,
std::unique_ptr<reco::GenParticleCollection>& consts,
edm::RefProd<reco::GenParticleCollection>& constsRefHandle,
int& iConstituent,
std::unique_ptr<reco::GenParticleCollection>& tags,
edm::RefProd<reco::GenParticleCollection>& tagsRefHandle,
int& iTag) {
const auto pjet = jet.pseudojet();
reco::GenJet genJet;
genJet.setP4(p4(jet));
genJet.setVertex(genVertex_);
if (jet.bTagged())
genJet.setPdgId(5);
else if (jet.cTagged())
genJet.setPdgId(4);
genJet.setJetArea(pjet.has_area() ? pjet.area() : 0);
for (auto const& p : jet.particles()) {
auto pp4 = p4(p);
bool match = false;
int iMatch = -1;
for (auto const& q : *consts) {
++iMatch;
if (q.p4() == pp4) {
match = true;
break;
}
}
if (match) {
genJet.addDaughter(edm::refToPtr(reco::GenParticleRef(constsRefHandle, iMatch)));
} else {
consts->push_back(reco::GenParticle(p.charge(), pp4, genVertex_, p.pid(), 1, true));
genJet.addDaughter(edm::refToPtr(reco::GenParticleRef(constsRefHandle, ++iConstituent)));
}
}
for (auto const& p : jet.tags()) {
// The tag particles are accessible as jet daughters, so scale down p4 for safety.
// p4 needs to be multiplied by 1e20 for fragmentation analysis.
auto pp4 = p4(p) * 1e-20;
bool match = false;
int iMatch = -1;
for (auto const& q : *tags) {
++iMatch;
if (q.p4() == pp4) {
match = true;
break;
}
}
if (match) {
genJet.addDaughter(edm::refToPtr(reco::GenParticleRef(tagsRefHandle, iMatch)));
} else {
tags->push_back(reco::GenParticle(p.charge(), p4(p) * 1e-20, genVertex_, p.pid(), 2, true));
genJet.addDaughter(edm::refToPtr(reco::GenParticleRef(tagsRefHandle, ++iTag)));
// Also save lepton+neutrino daughters of tag particles
int iTagMother = iTag;
for (auto const& d : p.constituents()) {
++iTag;
int d_status = (d.isStable()) ? 1 : 2;
tags->push_back(reco::GenParticle(d.charge(), p4(d) * 1e-20, genVertex_, d.pid(), d_status, true));
tags->at(iTag).addMother(reco::GenParticleRef(tagsRefHandle, iTagMother));
tags->at(iTagMother).addDaughter(reco::GenParticleRef(tagsRefHandle, iTag));
genJet.addDaughter(edm::refToPtr(reco::GenParticleRef(tagsRefHandle, iTag)));
}
}
}
jets->push_back(genJet);
}
void ParticleLevelProducer::produce(edm::Event& event, const edm::EventSetup& eventSetup) {
using namespace Rivet;
typedef reco::Candidate::LorentzVector LorentzVector;
std::unique_ptr<reco::GenParticleCollection> neutrinos(new reco::GenParticleCollection);
std::unique_ptr<reco::GenParticleCollection> photons(new reco::GenParticleCollection);
std::unique_ptr<reco::GenJetCollection> leptons(new reco::GenJetCollection);
std::unique_ptr<reco::GenJetCollection> jets(new reco::GenJetCollection);
std::unique_ptr<reco::GenJetCollection> fatjets(new reco::GenJetCollection);
std::unique_ptr<reco::GenParticleCollection> consts(new reco::GenParticleCollection);
std::unique_ptr<reco::GenParticleCollection> tags(new reco::GenParticleCollection);
std::unique_ptr<reco::METCollection> mets(new reco::METCollection);
auto constsRefHandle = event.getRefBeforePut<reco::GenParticleCollection>("consts");
auto tagsRefHandle = event.getRefBeforePut<reco::GenParticleCollection>("tags");
edm::Handle<HepMC3Product> srcHandle;
event.getByToken(srcToken_, srcHandle);
const HepMC3::GenEventData* genEventData = srcHandle->GetEvent();
std::unique_ptr<HepMC3::GenEvent> genEvent = std::make_unique<HepMC3::GenEvent>();
genEvent->read_data(*genEventData);
if (!rivetAnalysis_ || !rivetAnalysis_->hasProjection("FS")) {
rivetAnalysis_ = new Rivet::RivetAnalysis(pset_);
analysisHandler_ = std::make_unique<Rivet::AnalysisHandler>();
analysisHandler_->setCheckBeams(false);
analysisHandler_->addAnalysis(rivetAnalysis_);
}
analysisHandler_->analyze(const_cast<GenEvent&>(*genEvent));
// Convert into edm objects
// Prompt neutrinos
for (auto const& p : rivetAnalysis_->neutrinos()) {
neutrinos->push_back(reco::GenParticle(p.charge(), p4(p), genVertex_, p.pid(), 1, true));
}
std::sort(neutrinos->begin(), neutrinos->end(), GreaterByPt<reco::Candidate>());
// Photons
for (auto const& p : rivetAnalysis_->photons()) {
photons->push_back(reco::GenParticle(p.charge(), p4(p), genVertex_, p.pid(), 1, true));
}
std::sort(photons->begin(), photons->end(), GreaterByPt<reco::Candidate>());
// Prompt leptons
int iConstituent = -1;
int iTag = -1;
for (auto const& lepton : rivetAnalysis_->leptons()) {
reco::GenJet lepJet;
lepJet.setP4(p4(lepton));
lepJet.setVertex(genVertex_);
lepJet.setPdgId(lepton.pid());
lepJet.setCharge(lepton.charge());
for (auto const& p : lepton.constituents()) {
// ghost taus (momentum scaled with 1e-20 in RivetAnalysis.h already)
if (p.abspid() == 15) {
tags->push_back(reco::GenParticle(p.charge(), p4(p), genVertex_, p.pid(), 2, true));
lepJet.addDaughter(edm::refToPtr(reco::GenParticleRef(tagsRefHandle, ++iTag)));
}
// electrons, muons, photons
else {
consts->push_back(reco::GenParticle(p.charge(), p4(p), genVertex_, p.pid(), 1, true));
lepJet.addDaughter(edm::refToPtr(reco::GenParticleRef(constsRefHandle, ++iConstituent)));
}
}
leptons->push_back(lepJet);
}
std::sort(leptons->begin(), leptons->end(), GreaterByPt<reco::GenJet>());
// Jets with constituents and tag particles
for (const auto& jet : rivetAnalysis_->jets()) {
addGenJet(jet, jets, consts, constsRefHandle, iConstituent, tags, tagsRefHandle, iTag);
}
for (const auto& jet : rivetAnalysis_->fatjets()) {
addGenJet(jet, fatjets, consts, constsRefHandle, iConstituent, tags, tagsRefHandle, iTag);
}
// MET
reco::Candidate::LorentzVector metP4(rivetAnalysis_->met().x(),
rivetAnalysis_->met().y(),
0.,
sqrt(pow(rivetAnalysis_->met().x(), 2) + pow(rivetAnalysis_->met().y(), 2)));
mets->push_back(reco::MET(metP4, genVertex_));
event.put(std::move(neutrinos), "neutrinos");
event.put(std::move(photons), "photons");
event.put(std::move(leptons), "leptons");
event.put(std::move(jets), "jets");
event.put(std::move(fatjets), "fatjets");
event.put(std::move(consts), "consts");
event.put(std::move(tags), "tags");
event.put(std::move(mets), "mets");
}
DEFINE_FWK_MODULE(ParticleLevelProducer);
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