PseudoTopProducer Class Reference

Inheritance diagram for PseudoTopProducer:

Public Member Functions
void	produce (edm::Event &event, const edm::EventSetup &eventSetup) override
	PseudoTopProducer (const edm::ParameterSet &pset)
Public Member Functions inherited from edm::stream::EDProducer<>
	EDProducer ()=default
	EDProducer (const EDProducer &)=delete
bool	hasAbilityToProduceInBeginLumis () const final
bool	hasAbilityToProduceInBeginProcessBlocks () const final
bool	hasAbilityToProduceInBeginRuns () const final
bool	hasAbilityToProduceInEndLumis () const final
bool	hasAbilityToProduceInEndProcessBlocks () const final
bool	hasAbilityToProduceInEndRuns () const final
const EDProducer &	operator= (const EDProducer &)=delete

Private Types
typedef fastjet::JetDefinition	JetDef
typedef reco::Particle::LorentzVector	LorentzVector

Private Member Functions
bool	isBHadron (const reco::Candidate *p) const
bool	isBHadron (const unsigned int pdgId) const
bool	isFromHadron (const reco::Candidate *p) const

Private Attributes
const edm::EDGetTokenT< edm::View< reco::Candidate > >	finalStateToken_
std::shared_ptr< JetDef >	fjJetDef_
std::shared_ptr< JetDef >	fjLepDef_
const edm::EDGetTokenT< edm::View< reco::Candidate > >	genParticleToken_
reco::Particle::Point	genVertex_
const double	maxJetEta_
const double	maxLeptonEta_
const double	maxLeptonEtaDilepton_
const double	maxLeptonEtaSemilepton_
const double	maxVetoLeptonEtaSemilepton_
const double	minDileptonMassDilepton_
const double	minJetPt_
const double	minLeptonPt_
const double	minLeptonPtDilepton_
const double	minLeptonPtSemilepton_
const double	minMETSemiLepton_
const double	minMtWSemiLepton_
const double	minVetoLeptonPtSemilepton_
const double	tMass_
const double	wMass_

Additional Inherited Members
Public Types inherited from edm::stream::EDProducer<>
using	CacheTypes = CacheContexts< T... >
using	GlobalCache = typename CacheTypes::GlobalCache
using	HasAbility = AbilityChecker< T... >
using	InputProcessBlockCache = typename CacheTypes::InputProcessBlockCache
using	LuminosityBlockCache = typename CacheTypes::LuminosityBlockCache
using	LuminosityBlockContext = LuminosityBlockContextT< LuminosityBlockCache, RunCache, GlobalCache >
using	LuminosityBlockSummaryCache = typename CacheTypes::LuminosityBlockSummaryCache
using	RunCache = typename CacheTypes::RunCache
using	RunContext = RunContextT< RunCache, GlobalCache >
using	RunSummaryCache = typename CacheTypes::RunSummaryCache

Detailed Description

Definition at line 18 of file PseudoTopProducer.cc.

Member Typedef Documentation

JetDef

typedef fastjet::JetDefinition PseudoTopProducer::JetDef

private

Definition at line 41 of file PseudoTopProducer.cc.

LorentzVector

typedef reco::Particle::LorentzVector PseudoTopProducer::LorentzVector

private

Definition at line 28 of file PseudoTopProducer.cc.

Constructor & Destructor Documentation

PseudoTopProducer()

PseudoTopProducer::PseudoTopProducer

(

const edm::ParameterSet &

pset

)

Definition at line 50 of file PseudoTopProducer.cc.

References fjJetDef_, fjLepDef_, genVertex_, particleLevel_cfi::jetConeSize, pseudoTop_cfi::leptonConeSize, and muonDTDigis_cfi::pset.

    : finalStateToken_(consumes<edm::View<reco::Candidate> >(pset.getParameter<edm::InputTag>("finalStates"))),
      genParticleToken_(consumes<edm::View<reco::Candidate> >(pset.getParameter<edm::InputTag>("genParticles"))),
      minLeptonPt_(pset.getParameter<double>("minLeptonPt")),
      maxLeptonEta_(pset.getParameter<double>("maxLeptonEta")),
      minJetPt_(pset.getParameter<double>("minJetPt")),
      maxJetEta_(pset.getParameter<double>("maxJetEta")),
      wMass_(pset.getParameter<double>("wMass")),
      tMass_(pset.getParameter<double>("tMass")),
      minLeptonPtDilepton_(pset.getParameter<double>("minLeptonPtDilepton")),
      maxLeptonEtaDilepton_(pset.getParameter<double>("maxLeptonEtaDilepton")),
      minDileptonMassDilepton_(pset.getParameter<double>("minDileptonMassDilepton")),
      minLeptonPtSemilepton_(pset.getParameter<double>("minLeptonPtSemilepton")),
      maxLeptonEtaSemilepton_(pset.getParameter<double>("maxLeptonEtaSemilepton")),
      minVetoLeptonPtSemilepton_(pset.getParameter<double>("minVetoLeptonPtSemilepton")),
      maxVetoLeptonEtaSemilepton_(pset.getParameter<double>("maxVetoLeptonEtaSemilepton")),
      minMETSemiLepton_(pset.getParameter<double>("minMETSemiLepton")),
      minMtWSemiLepton_(pset.getParameter<double>("minMtWSemiLepton")) {
  const double leptonConeSize = pset.getParameter<double>("leptonConeSize");
  const double jetConeSize = pset.getParameter<double>("jetConeSize");
  fjLepDef_ = std::make_shared<JetDef>(fastjet::antikt_algorithm, leptonConeSize);
  fjJetDef_ = std::make_shared<JetDef>(fastjet::antikt_algorithm, jetConeSize);

  genVertex_ = reco::Particle::Point(0, 0, 0);

  produces<reco::GenParticleCollection>("neutrinos");
  produces<reco::GenJetCollection>("leptons");
  produces<reco::GenJetCollection>("jets");

  produces<reco::GenParticleCollection>();
}

Member Function Documentation

isBHadron() [1/2]

bool PseudoTopProducer::isBHadron ( const reco::Candidate *  p ) const

private

Definition at line 546 of file PseudoTopProducer.cc.

References funct::abs(), mps_fire::i, create_idmaps::n, AlCaHLTBitMon_ParallelJobs::p, and reco::Candidate::pdgId().

Referenced by produce().

                                                              {
  const unsigned int absPdgId = abs(p->pdgId());
  if (!isBHadron(absPdgId))
    return false;

  // Do not consider this particle if it has B hadron daughter
  // For example, B* -> B0 + photon; then we drop B* and take B0 only
  for (int i = 0, n = p->numberOfDaughters(); i < n; ++i) {
    const reco::Candidate* dau = p->daughter(i);
    if (isBHadron(abs(dau->pdgId())))
      return false;
  }

  return true;
}

isBHadron() [2/2]

bool PseudoTopProducer::isBHadron ( const unsigned int  pdgId ) const

private

Definition at line 562 of file PseudoTopProducer.cc.

                                                                   {
  if (absPdgId <= 100)
    return false;  // Fundamental particles and MC internals
  if (absPdgId >= 1000000000)
    return false;  // Nuclei, +-10LZZZAAAI

  // General form of PDG ID is 7 digit form
  // +- n nr nL nq1 nq2 nq3 nJ
  //const int nJ = absPdgId % 10; // Spin
  const int nq3 = (absPdgId / 10) % 10;
  const int nq2 = (absPdgId / 100) % 10;
  const int nq1 = (absPdgId / 1000) % 10;

  if (nq3 == 0)
    return false;  // Diquarks
  if (nq1 == 0 and nq2 == 5)
    return true;  // B mesons
  if (nq1 == 5)
    return true;  // B baryons

  return false;
}

isFromHadron()

bool PseudoTopProducer::isFromHadron ( const reco::Candidate *  p ) const

private

Definition at line 529 of file PseudoTopProducer.cc.

References funct::abs(), mps_fire::i, create_idmaps::n, reco::Candidate::numberOfMothers(), or, AlCaHLTBitMon_ParallelJobs::p, EgammaValidation_cff::pdgId, reco::Candidate::pdgId(), and reco::Candidate::status().

Referenced by produce().

                                                                 {
  for (size_t i = 0, n = p->numberOfMothers(); i < n; ++i) {
    const reco::Candidate* mother = p->mother(i);
    if (!mother)
      continue;
    if (mother->status() == 4 or mother->numberOfMothers() == 0)
      continue;  // Skip incident beam
    const int pdgId = abs(mother->pdgId());

    if (pdgId > 100)
      return true;
    else if (isFromHadron(mother))
      return true;
  }
  return false;
}

produce()

void PseudoTopProducer::produce ( edm::Event &  event, const edm::EventSetup &  eventSetup  )

override

Build jets

Definition at line 82 of file PseudoTopProducer.cc.

References funct::abs(), Matriplex::atan2(), b1, b2, RazorAnalyzer::bJet1, RazorAnalyzer::bJet2, reco::Candidate::charge(), funct::cos(), eleIsoSequence_cff::deltaR, symbols::dm, HGC3DClusterGenMatchSelector_cfi::dR, MillePedeFileConverter_cfg::e, finalStateToken_, fjJetDef_, fjLepDef_, genParticleToken_, genVertex_, Matriplex::hypot(), mps_fire::i, isBHadron(), isFromHadron(), CommonMethods::isnan(), edm::Ptr< T >::isNonnull(), edm::Ptr< T >::isNull(), dqmiolumiharvest::j, run3scouting_cff::jetArea, PDWG_EXODelayedJetMET_cff::jets, HLT_2024v14_cff::leptons, visualization-live-secondInstance_cfg::m, EgHLTOffHistBins_cfi::mass, maxJetEta_, maxLeptonEta_, maxLeptonEtaDilepton_, maxLeptonEtaSemilepton_, maxVetoLeptonEtaSemilepton_, minDileptonMassDilepton_, HLT_2024v14_cff::minDR, minJetPt_, minLeptonPt_, minLeptonPtDilepton_, minLeptonPtSemilepton_, minMETSemiLepton_, minMtWSemiLepton_, minVetoLeptonPtSemilepton_, eostools::move(), create_idmaps::n, TtSemiLepHypHitFit_cfi::neutrinos, GetRecoTauVFromDQM_MC_cff::next, or, AlCaHLTBitMon_ParallelJobs::p, reco::Candidate::pdgId(), pseudoTop_cfi::pseudoTop, reco::Candidate::pt(), submitPVResolutionJobs::q, isotrackNtupler::scale, jetUpdater_cfi::sort, mathSSE::sqrt(), mps_update::status, RandomServiceHelper::t1, RandomServiceHelper::t2, tMass_, MetAnalyzer::u2, w2, wMass_, and reco::writeSpecific().

                                                                                {
  edm::Handle<edm::View<reco::Candidate> > finalStateHandle;
  event.getByToken(finalStateToken_, finalStateHandle);

  edm::Handle<edm::View<reco::Candidate> > genParticleHandle;
  event.getByToken(genParticleToken_, genParticleHandle);

  std::unique_ptr<reco::GenParticleCollection> neutrinos(new reco::GenParticleCollection);
  std::unique_ptr<reco::GenJetCollection> leptons(new reco::GenJetCollection);
  std::unique_ptr<reco::GenJetCollection> jets(new reco::GenJetCollection);
  auto neutrinosRefHandle = event.getRefBeforePut<reco::GenParticleCollection>("neutrinos");
  auto leptonsRefHandle = event.getRefBeforePut<reco::GenJetCollection>("leptons");
  auto jetsRefHandle = event.getRefBeforePut<reco::GenJetCollection>("jets");

  std::unique_ptr<reco::GenParticleCollection> pseudoTop(new reco::GenParticleCollection);
  auto pseudoTopRefHandle = event.getRefBeforePut<reco::GenParticleCollection>();

  // Collect unstable B-hadrons
  std::set<int> bHadronIdxs;
  for (size_t i = 0, n = genParticleHandle->size(); i < n; ++i) {
    const reco::Candidate& p = genParticleHandle->at(i);
    const int status = p.status();
    if (status == 1)
      continue;

    // Collect B-hadrons, to be used in b tagging
    if (isBHadron(&p))
      bHadronIdxs.insert(-i - 1);
  }

  // Collect stable leptons and neutrinos
  size_t nStables = 0;
  std::vector<size_t> leptonIdxs;
  for (size_t i = 0, n = finalStateHandle->size(); i < n; ++i) {
    const reco::Candidate& p = finalStateHandle->at(i);
    const int absPdgId = abs(p.pdgId());
    if (p.status() != 1)
      continue;

    ++nStables;
    if (p.numberOfMothers() == 0)
      continue;  // Skip orphans (if exists)
    if (p.mother()->status() == 4)
      continue;  // Treat particle as hadronic if directly from the incident beam (protect orphans in MINIAOD)
    if (isFromHadron(&p))
      continue;
    switch (absPdgId) {
      case 11:
      case 13:  // Leptons
      case 22:  // Photons
        leptonIdxs.push_back(i);
        break;
      case 12:
      case 14:
      case 16:
        neutrinos->push_back(reco::GenParticle(p.charge(), p.p4(), p.vertex(), p.pdgId(), p.status(), true));
        break;
    }
  }

  // Sort neutrinos by pT.
  std::sort(neutrinos->begin(), neutrinos->end(), GreaterByPt<reco::Candidate>());

  // Make dressed leptons with anti-kt(0.1) algorithm
  std::vector<fastjet::PseudoJet> fjLepInputs;
  fjLepInputs.reserve(leptonIdxs.size());
  for (auto index : leptonIdxs) {
    const reco::Candidate& p = finalStateHandle->at(index);
    if (std::isnan(p.pt()) or p.pt() <= 0)
      continue;

    fjLepInputs.push_back(fastjet::PseudoJet(p.px(), p.py(), p.pz(), p.energy()));
    fjLepInputs.back().set_user_index(index);
  }

  fastjet::ClusterSequence fjLepClusterSeq(fjLepInputs, *fjLepDef_);
  std::vector<fastjet::PseudoJet> fjLepJets = fastjet::sorted_by_pt(fjLepClusterSeq.inclusive_jets(minLeptonPt_));

  leptons->reserve(fjLepJets.size());
  std::set<size_t> lepDauIdxs;  // keep lepton constituents to remove from GenJet construction
  for (auto& fjJet : fjLepJets) {
    if (abs(fjJet.eta()) > maxLeptonEta_)
      continue;

    // Get jet constituents from fastJet
    const std::vector<fastjet::PseudoJet> fjConstituents = fastjet::sorted_by_pt(fjJet.constituents());
    // Convert to CandidatePtr
    std::vector<reco::CandidatePtr> constituents;
    reco::CandidatePtr lepCand;
    for (auto& fjConstituent : fjConstituents) {
      const size_t index = fjConstituent.user_index();
      reco::CandidatePtr cand = finalStateHandle->ptrAt(index);
      const int absPdgId = abs(cand->pdgId());
      if (absPdgId == 11 or absPdgId == 13) {
        if (lepCand.isNonnull() and lepCand->pt() > cand->pt())
          continue;  // Choose one with highest pt
        lepCand = cand;
      }
      constituents.push_back(cand);
    }
    if (lepCand.isNull())
      continue;

    const LorentzVector jetP4(fjJet.px(), fjJet.py(), fjJet.pz(), fjJet.E());
    reco::GenJet lepJet;
    reco::writeSpecific(lepJet, jetP4, genVertex_, constituents);

    lepJet.setPdgId(lepCand->pdgId());
    lepJet.setCharge(lepCand->charge());

    const double jetArea = fjJet.has_area() ? fjJet.area() : 0;
    lepJet.setJetArea(jetArea);

    leptons->push_back(lepJet);

    // Keep constituent indices to be used in the next step.
    for (auto& fjConstituent : fjConstituents) {
      lepDauIdxs.insert(fjConstituent.user_index());
    }
  }

  // Now proceed to jets.
  // Jets: anti-kt excluding the e, mu, nu, and photons in selected leptons.
  std::vector<fastjet::PseudoJet> fjJetInputs;
  fjJetInputs.reserve(nStables);
  for (size_t i = 0, n = finalStateHandle->size(); i < n; ++i) {
    const reco::Candidate& p = finalStateHandle->at(i);
    if (p.status() != 1)
      continue;
    if (std::isnan(p.pt()) or p.pt() <= 0)
      continue;

    const int absId = std::abs(p.pdgId());
    if (absId == 12 or absId == 14 or absId == 16)
      continue;
    if (lepDauIdxs.find(i) != lepDauIdxs.end())
      continue;

    fjJetInputs.push_back(fastjet::PseudoJet(p.px(), p.py(), p.pz(), p.energy()));
    fjJetInputs.back().set_user_index(i);
  }
  for (auto index : bHadronIdxs) {
    const reco::Candidate& p = genParticleHandle->at(abs(index + 1));
    if (std::isnan(p.pt()) or p.pt() <= 0)
      continue;

    const double scale = 1e-20 / p.p();
    fjJetInputs.push_back(fastjet::PseudoJet(p.px() * scale, p.py() * scale, p.pz() * scale, p.energy() * scale));
    fjJetInputs.back().set_user_index(index);
  }

  fastjet::ClusterSequence fjJetClusterSeq(fjJetInputs, *fjJetDef_);
  std::vector<fastjet::PseudoJet> fjJets = fastjet::sorted_by_pt(fjJetClusterSeq.inclusive_jets(minJetPt_));

  jets->reserve(fjJets.size());
  std::vector<size_t> bjetIdxs, ljetIdxs;
  for (auto& fjJet : fjJets) {
    if (abs(fjJet.eta()) > maxJetEta_)
      continue;

    // Get jet constituents from fastJet
    const std::vector<fastjet::PseudoJet> fjConstituents = fastjet::sorted_by_pt(fjJet.constituents());
    // Convert to CandidatePtr
    std::vector<reco::CandidatePtr> constituents;
    bool hasBHadron = false;
    for (size_t j = 0, m = fjConstituents.size(); j < m; ++j) {
      const int index = fjConstituents[j].user_index();
      if (bHadronIdxs.find(index) != bHadronIdxs.end()) {
        hasBHadron = true;
        continue;
      }
      reco::CandidatePtr cand = finalStateHandle->ptrAt(index);
      constituents.push_back(cand);
    }

    const LorentzVector jetP4(fjJet.px(), fjJet.py(), fjJet.pz(), fjJet.E());
    reco::GenJet genJet;
    reco::writeSpecific(genJet, jetP4, genVertex_, constituents);

    const double jetArea = fjJet.has_area() ? fjJet.area() : 0;
    genJet.setJetArea(jetArea);
    if (hasBHadron) {
      genJet.setPdgId(5);
      bjetIdxs.push_back(jets->size());
    } else {
      ljetIdxs.push_back(jets->size());
    }

    jets->push_back(genJet);
  }

  // Every building blocks are ready. Continue to pseudo-W and pseudo-top combination
  // NOTE : A C++ trick, use do-while instead of long-nested if-statements.
  do {
    if (bjetIdxs.size() < 2)
      break;

    // Note : we will do dilepton or semilepton channel only
    if (leptons->size() == 2 and neutrinos->size() >= 2) {
      // Start from dilepton channel
      const int q1 = leptons->at(0).charge();
      const int q2 = leptons->at(1).charge();
      if (q1 * q2 > 0)
        break;

      const auto& lepton1 = q1 > 0 ? leptons->at(0) : leptons->at(1);
      const auto& lepton2 = q1 > 0 ? leptons->at(1) : leptons->at(0);

      if (lepton1.pt() < minLeptonPtDilepton_ or std::abs(lepton1.eta()) > maxLeptonEtaDilepton_)
        break;
      if (lepton2.pt() < minLeptonPtDilepton_ or std::abs(lepton2.eta()) > maxLeptonEtaDilepton_)
        break;
      if ((lepton1.p4() + lepton2.p4()).mass() < minDileptonMassDilepton_)
        break;

      double dm = 1e9;
      int selNu1 = -1, selNu2 = -1;
      for (int i = 0; i < 2; ++i) {  // Consider leading 2 neutrinos. Neutrino vector is already sorted by pT
        const double dm1 = std::abs((lepton1.p4() + neutrinos->at(i).p4()).mass() - wMass_);
        for (int j = 0; j < 2; ++j) {
          if (i == j)
            continue;
          const double dm2 = std::abs((lepton2.p4() + neutrinos->at(j).p4()).mass() - wMass_);
          const double newDm = dm1 + dm2;

          if (newDm < dm) {
            dm = newDm;
            selNu1 = i;
            selNu2 = j;
          }
        }
      }
      if (dm >= 1e9)
        break;

      const auto& nu1 = neutrinos->at(selNu1);
      const auto& nu2 = neutrinos->at(selNu2);
      const auto w1LVec = lepton1.p4() + nu1.p4();
      const auto w2LVec = lepton2.p4() + nu2.p4();

      // Contiue to top quarks
      dm = 1e9;  // Reset once again for top combination.
      int selB1 = -1, selB2 = -1;
      for (auto i : bjetIdxs) {
        const double dm1 = std::abs((w1LVec + jets->at(i).p4()).mass() - tMass_);
        for (auto j : bjetIdxs) {
          if (i == j)
            continue;
          const double dm2 = std::abs((w2LVec + jets->at(j).p4()).mass() - tMass_);
          const double newDm = dm1 + dm2;

          if (newDm < dm) {
            dm = newDm;
            selB1 = i;
            selB2 = j;
          }
        }
      }
      if (dm >= 1e9)
        break;

      const auto& bJet1 = jets->at(selB1);
      const auto& bJet2 = jets->at(selB2);
      const auto t1LVec = w1LVec + bJet1.p4();
      const auto t2LVec = w2LVec + bJet2.p4();

      // Recalculate lepton charges (needed due to initialization of leptons wrt sign of a charge)
      const int lepQ1 = lepton1.charge();
      const int lepQ2 = lepton2.charge();

      // Put all of them into candidate collection
      reco::GenParticle t1(lepQ1 * 2 / 3., t1LVec, genVertex_, lepQ1 * 6, 3, false);
      reco::GenParticle w1(lepQ1, w1LVec, genVertex_, lepQ1 * 24, 3, true);
      reco::GenParticle b1(-lepQ1 / 3., bJet1.p4(), genVertex_, lepQ1 * 5, 1, true);
      reco::GenParticle l1(lepQ1, lepton1.p4(), genVertex_, lepton1.pdgId(), 1, true);
      reco::GenParticle n1(0, nu1.p4(), genVertex_, nu1.pdgId(), 1, true);

      reco::GenParticle t2(lepQ2 * 2 / 3., t2LVec, genVertex_, lepQ2 * 6, 3, false);
      reco::GenParticle w2(lepQ2, w2LVec, genVertex_, lepQ2 * 24, 3, true);
      reco::GenParticle b2(-lepQ2 / 3., bJet2.p4(), genVertex_, lepQ2 * 5, 1, true);
      reco::GenParticle l2(lepQ2, lepton2.p4(), genVertex_, lepton2.pdgId(), 1, true);
      reco::GenParticle n2(0, nu2.p4(), genVertex_, nu2.pdgId(), 1, true);

      pseudoTop->push_back(t1);
      pseudoTop->push_back(t2);

      pseudoTop->push_back(w1);
      pseudoTop->push_back(b1);
      pseudoTop->push_back(l1);
      pseudoTop->push_back(n1);

      pseudoTop->push_back(w2);
      pseudoTop->push_back(b2);
      pseudoTop->push_back(l2);
      pseudoTop->push_back(n2);
    } else if (!leptons->empty() and !neutrinos->empty() and ljetIdxs.size() >= 2) {
      // Then continue to the semi-leptonic channel
      const auto& lepton = leptons->at(0);
      if (lepton.pt() < minLeptonPtSemilepton_ or std::abs(lepton.eta()) > maxLeptonEtaSemilepton_)
        break;

      // Skip event if there are veto leptons
      bool hasVetoLepton = false;
      for (auto vetoLeptonItr = next(leptons->begin()); vetoLeptonItr != leptons->end(); ++vetoLeptonItr) {
        if (vetoLeptonItr->pt() > minVetoLeptonPtSemilepton_ and
            std::abs(vetoLeptonItr->eta()) < maxVetoLeptonEtaSemilepton_) {
          hasVetoLepton = true;
        }
      }
      if (hasVetoLepton)
        break;

      // Calculate MET
      double metX = 0, metY = 0;
      for (const auto& neutrino : *neutrinos) {
        metX += neutrino.px();
        metY += neutrino.py();
      }
      const double metPt = std::hypot(metX, metY);
      if (metPt < minMETSemiLepton_)
        break;

      const double mtW = std::sqrt(2 * lepton.pt() * metPt * cos(lepton.phi() - atan2(metX, metY)));
      if (mtW < minMtWSemiLepton_)
        break;

      // Solve pz to give wMass_^2 = (lepE+energy)^2 - (lepPx+metX)^2 - (lepPy+metY)^2 - (lepPz+pz)^2
      // -> (wMass_^2)/2 = lepE*sqrt(metPt^2+pz^2) - lepPx*metX - lepPy*metY - lepPz*pz
      // -> C := (wMass_^2)/2 + lepPx*metX + lepPy*metY
      // -> lepE^2*(metPt^2+pz^2) = C^2 + 2*C*lepPz*pz + lepPz^2*pz^2
      // -> (lepE^2-lepPz^2)*pz^2 - 2*C*lepPz*pz - C^2 + lepE^2*metPt^2 = 0
      // -> lepPt^2*pz^2 - 2*C*lepPz*pz - C^2 + lepE^2*metPt^2 = 0
      const double lpz = lepton.pz(), le = lepton.energy(), lpt = lepton.pt();
      const double cf = (wMass_ * wMass_) / 2 + lepton.px() * metX + lepton.py() * metY;
      const double det = cf * cf * lpz * lpz - lpt * lpt * (le * le * metPt * metPt - cf * cf);
      const double pz = (cf * lpz + (cf < 0 ? -sqrt(det) : sqrt(det))) / lpt / lpt;
      const reco::Candidate::LorentzVector nu1P4(metX, metY, pz, std::hypot(metPt, pz));
      const auto w1LVec = lepton.p4() + nu1P4;

      // Continue to build leptonic pseudo top
      double minDR = 1e9;
      int selB1 = -1;
      for (auto b1Itr = bjetIdxs.begin(); b1Itr != bjetIdxs.end(); ++b1Itr) {
        const double dR = deltaR(jets->at(*b1Itr).p4(), w1LVec);
        if (dR < minDR) {
          selB1 = *b1Itr;
          minDR = dR;
        }
      }
      if (selB1 == -1)
        break;
      const auto& bJet1 = jets->at(selB1);
      const auto t1LVec = w1LVec + bJet1.p4();

      // Build hadronic pseudo W, take leading two jets (ljetIdxs are (implicitly) sorted by pT)
      const auto& wJet1 = jets->at(ljetIdxs[0]);
      const auto& wJet2 = jets->at(ljetIdxs[1]);
      const auto w2LVec = wJet1.p4() + wJet2.p4();

      // Contiue to top quarks
      double dm = 1e9;
      int selB2 = -1;
      for (auto i : bjetIdxs) {
        if (int(i) == selB1)
          continue;
        const double newDm = std::abs((w2LVec + jets->at(i).p4()).mass() - tMass_);
        if (newDm < dm) {
          dm = newDm;
          selB2 = i;
        }
      }
      if (dm >= 1e9)
        break;

      const auto& bJet2 = jets->at(selB2);
      const auto t2LVec = w2LVec + bJet2.p4();

      const int q = lepton.charge();
      // Put all of them into candidate collection
      reco::GenParticle t1(q * 2 / 3., t1LVec, genVertex_, q * 6, 3, false);
      reco::GenParticle w1(q, w1LVec, genVertex_, q * 24, 3, true);
      reco::GenParticle b1(-q / 3., bJet1.p4(), genVertex_, q * 5, 1, true);
      reco::GenParticle l1(q, lepton.p4(), genVertex_, lepton.pdgId(), 1, true);
      reco::GenParticle n1(0, nu1P4, genVertex_, q * (std::abs(lepton.pdgId()) + 1), 1, true);

      reco::GenParticle t2(-q * 2 / 3., t2LVec, genVertex_, -q * 6, 3, false);
      reco::GenParticle w2(-q, w2LVec, genVertex_, -q * 24, 3, true);
      reco::GenParticle b2(0, bJet2.p4(), genVertex_, -q * 5, 1, true);
      reco::GenParticle u2(0, wJet1.p4(), genVertex_, -2 * q, 1, true);
      reco::GenParticle d2(0, wJet2.p4(), genVertex_, q, 1, true);

      pseudoTop->push_back(t1);
      pseudoTop->push_back(t2);

      pseudoTop->push_back(w1);
      pseudoTop->push_back(b1);
      pseudoTop->push_back(l1);
      pseudoTop->push_back(n1);

      pseudoTop->push_back(w2);
      pseudoTop->push_back(b2);
      pseudoTop->push_back(u2);
      pseudoTop->push_back(d2);
    }
  } while (false);

  if (pseudoTop->size() == 10)  // If pseudtop decay tree is completed
  {
    // t->W+b
    pseudoTop->at(0).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 2));  // t->W
    pseudoTop->at(0).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 3));  // t->b
    pseudoTop->at(2).addMother(reco::GenParticleRef(pseudoTopRefHandle, 0));    // t->W
    pseudoTop->at(3).addMother(reco::GenParticleRef(pseudoTopRefHandle, 0));    // t->b

    // W->lv or W->jj
    pseudoTop->at(2).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 4));
    pseudoTop->at(2).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 5));
    pseudoTop->at(4).addMother(reco::GenParticleRef(pseudoTopRefHandle, 2));
    pseudoTop->at(5).addMother(reco::GenParticleRef(pseudoTopRefHandle, 2));

    // tbar->W-b
    pseudoTop->at(1).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 6));
    pseudoTop->at(1).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 7));
    pseudoTop->at(6).addMother(reco::GenParticleRef(pseudoTopRefHandle, 1));
    pseudoTop->at(7).addMother(reco::GenParticleRef(pseudoTopRefHandle, 1));

    // W->jj
    pseudoTop->at(6).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 8));
    pseudoTop->at(6).addDaughter(reco::GenParticleRef(pseudoTopRefHandle, 9));
    pseudoTop->at(8).addMother(reco::GenParticleRef(pseudoTopRefHandle, 6));
    pseudoTop->at(9).addMother(reco::GenParticleRef(pseudoTopRefHandle, 6));
  }

  event.put(std::move(neutrinos), "neutrinos");
  event.put(std::move(leptons), "leptons");
  event.put(std::move(jets), "jets");

  event.put(std::move(pseudoTop));
}

Member Data Documentation

finalStateToken_

const edm::EDGetTokenT<edm::View<reco::Candidate> > PseudoTopProducer::finalStateToken_

private

Definition at line 31 of file PseudoTopProducer.cc.

Referenced by produce().

fjJetDef_

std::shared_ptr<JetDef> PseudoTopProducer::fjJetDef_

private

Definition at line 42 of file PseudoTopProducer.cc.

Referenced by produce(), and PseudoTopProducer().

fjLepDef_

std::shared_ptr<JetDef> PseudoTopProducer::fjLepDef_

private

Definition at line 42 of file PseudoTopProducer.cc.

Referenced by produce(), and PseudoTopProducer().

genParticleToken_

const edm::EDGetTokenT<edm::View<reco::Candidate> > PseudoTopProducer::genParticleToken_

private

Definition at line 32 of file PseudoTopProducer.cc.

Referenced by produce().

genVertex_

reco::Particle::Point PseudoTopProducer::genVertex_

private

Definition at line 43 of file PseudoTopProducer.cc.

Referenced by produce(), and PseudoTopProducer().

maxJetEta_

const double PseudoTopProducer::maxJetEta_

private

Definition at line 33 of file PseudoTopProducer.cc.

Referenced by produce().

maxLeptonEta_

const double PseudoTopProducer::maxLeptonEta_

private

Definition at line 33 of file PseudoTopProducer.cc.

Referenced by produce().

maxLeptonEtaDilepton_

const double PseudoTopProducer::maxLeptonEtaDilepton_

private

Definition at line 35 of file PseudoTopProducer.cc.

Referenced by produce().

maxLeptonEtaSemilepton_

const double PseudoTopProducer::maxLeptonEtaSemilepton_

private

Definition at line 37 of file PseudoTopProducer.cc.

Referenced by produce().

maxVetoLeptonEtaSemilepton_

const double PseudoTopProducer::maxVetoLeptonEtaSemilepton_

private

Definition at line 38 of file PseudoTopProducer.cc.

Referenced by produce().

minDileptonMassDilepton_

const double PseudoTopProducer::minDileptonMassDilepton_

private

Definition at line 36 of file PseudoTopProducer.cc.

Referenced by produce().

minJetPt_

const double PseudoTopProducer::minJetPt_

private

Definition at line 33 of file PseudoTopProducer.cc.

Referenced by produce().

minLeptonPt_

const double PseudoTopProducer::minLeptonPt_

private

Definition at line 33 of file PseudoTopProducer.cc.

Referenced by produce().

minLeptonPtDilepton_

const double PseudoTopProducer::minLeptonPtDilepton_

private

Definition at line 35 of file PseudoTopProducer.cc.

Referenced by produce().

minLeptonPtSemilepton_

const double PseudoTopProducer::minLeptonPtSemilepton_

private

Definition at line 37 of file PseudoTopProducer.cc.

Referenced by produce().

minMETSemiLepton_

const double PseudoTopProducer::minMETSemiLepton_

private

Definition at line 39 of file PseudoTopProducer.cc.

Referenced by produce().

minMtWSemiLepton_

const double PseudoTopProducer::minMtWSemiLepton_

private

Definition at line 39 of file PseudoTopProducer.cc.

Referenced by produce().

minVetoLeptonPtSemilepton_

const double PseudoTopProducer::minVetoLeptonPtSemilepton_

private

Definition at line 38 of file PseudoTopProducer.cc.

Referenced by produce().

tMass_

const double PseudoTopProducer::tMass_

private

Definition at line 34 of file PseudoTopProducer.cc.

Referenced by produce().

wMass_

const double PseudoTopProducer::wMass_

private

Definition at line 34 of file PseudoTopProducer.cc.

Referenced by produce().