MuScleFitMuonSelector.cc

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#include "MuScleFitMuonSelector.h"
#include "DataFormats/MuonReco/interface/CaloMuon.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "MuonAnalysis/MomentumScaleCalibration/interface/Muon.h"
 
const double MuScleFitMuonSelector::mMu2 = 0.011163612;
const unsigned int MuScleFitMuonSelector::motherPdgIdArray[] = {23, 100553, 100553, 553, 100443, 443};
 
const reco::Candidate* MuScleFitMuonSelector::getStatus1Muon(const reco::Candidate* status3Muon) {
  const reco::Candidate* tempMuon = status3Muon;
  //  bool lastCopy = (static_cast<const reco::GenParticle*>(tempMuon))->isLastCopy();                      //  isLastCopy() likely not enough robust
  bool isPromptFinalState = static_cast<const reco::GenParticle*>(tempMuon)
                                ->isPromptFinalState();  //  pre-CMSSW_74X code: int status = tempStatus1Muon->status();
  while (tempMuon == nullptr || tempMuon->numberOfDaughters() != 0) {
    if (isPromptFinalState)
      break;  //  pre-CMSSW_74X code: if (status == 1) break;
    //std::vector<const reco::Candidate*> daughters;
    for (unsigned int i = 0; i < tempMuon->numberOfDaughters(); ++i) {
      if (tempMuon->daughter(i)->pdgId() == tempMuon->pdgId()) {
        tempMuon = tempMuon->daughter(i);
        isPromptFinalState = static_cast<const reco::GenParticle*>(tempMuon)
                                 ->isPromptFinalState();  //  pre-CMSSW_74X code: status = tempStatus1Muon->status();
        break;
      } else
        continue;
    }  //for loop
  }    //while loop
 
  return tempMuon;
}
 
const reco::Candidate* MuScleFitMuonSelector::getStatus3Muon(const reco::Candidate* status3Muon) {
  const reco::Candidate* tempMuon = status3Muon;
  bool lastCopy = static_cast<const reco::GenParticle*>(tempMuon)
                      ->isLastCopyBeforeFSR();  //  pre-CMSSW_74X code: int status = tempStatus1Muon->status();
  while (tempMuon == nullptr || tempMuon->numberOfDaughters() != 0) {
    if (lastCopy)
      break;  //  pre-CMSSW_74X code: if (status == 3) break;
    //std::vector<const reco::Candidate*> daughters;
    for (unsigned int i = 0; i < tempMuon->numberOfDaughters(); ++i) {
      if (tempMuon->daughter(i)->pdgId() == tempMuon->pdgId()) {
        tempMuon = tempMuon->daughter(i);
        lastCopy = static_cast<const reco::GenParticle*>(tempMuon)
                       ->isLastCopyBeforeFSR();  //  pre-CMSSW_74X code: status = tempStatus1Muon->status();
        break;
      } else
        continue;
    }  //for loop
  }    //while loop
 
  return tempMuon;
}
 
bool MuScleFitMuonSelector::selGlobalMuon(const pat::Muon* aMuon) {
  reco::TrackRef iTrack = aMuon->innerTrack();
  const reco::HitPattern& p = iTrack->hitPattern();
 
  reco::TrackRef gTrack = aMuon->globalTrack();
  const reco::HitPattern& q = gTrack->hitPattern();
 
  return (  //isMuonInAccept(aMuon) &&// no acceptance cuts!
      iTrack->found() > 11 && gTrack->chi2() / gTrack->ndof() < 20.0 && q.numberOfValidMuonHits() > 0 &&
      iTrack->chi2() / iTrack->ndof() < 4.0 && aMuon->muonID("TrackerMuonArbitrated") &&
      aMuon->muonID("TMLastStationAngTight") && p.pixelLayersWithMeasurement() > 1 &&
      std::abs(iTrack->dxy()) < 3.0 &&  //should be done w.r.t. PV!
      std::abs(iTrack->dz()) < 15.0     //should be done w.r.t. PV!
  );
}
 
bool MuScleFitMuonSelector::selTrackerMuon(const pat::Muon* aMuon) {
  reco::TrackRef iTrack = aMuon->innerTrack();
  const reco::HitPattern& p = iTrack->hitPattern();
 
  return (  //isMuonInAccept(aMuon) // no acceptance cuts!
      iTrack->found() > 11 && iTrack->chi2() / iTrack->ndof() < 4.0 && aMuon->muonID("TrackerMuonArbitrated") &&
      aMuon->muonID("TMLastStationAngTight") && p.pixelLayersWithMeasurement() > 1 &&
      std::abs(iTrack->dxy()) < 3.0 &&  //should be done w.r.t. PV!
      std::abs(iTrack->dz()) < 15.0     //should be done w.r.t. PV!
  );
}
 
// Note that at this level we save all the information. Events for which no suitable muon pair is found
// are removed from the tree (together with the gen and sim information) at a later stage.
// It would be better to remove them directly at this point.
void MuScleFitMuonSelector::selectMuons(const edm::Event& event,
                                        std::vector<MuScleFitMuon>& muons,
                                        std::vector<GenMuonPair>& genPair,
                                        std::vector<std::pair<lorentzVector, lorentzVector> >& simPair,
                                        MuScleFitPlotter* plotter) {
  edm::Handle<pat::CompositeCandidateCollection> collAll;
  event.getByLabel("onia2MuMuPatTrkTrk", collAll);
  if (!collAll.isValid()) {
    edm::LogWarning("MuScleFitUtils") << "J/psi not present in event!";
  }
  std::vector<const pat::Muon*> collMuSel;
 
  //================onia cuts===========================/
 
  if (muonType_ <= -1 && PATmuons_) {
    std::vector<const pat::CompositeCandidate*> collSelGG;
    std::vector<const pat::CompositeCandidate*> collSelGT;
    std::vector<const pat::CompositeCandidate*> collSelTT;
    if (collAll.isValid()) {
      for (std::vector<pat::CompositeCandidate>::const_iterator it = collAll->begin(); it != collAll->end(); ++it) {
        const pat::CompositeCandidate* cand = &(*it);
        // cout << "Now checking candidate of type " << theJpsiCat << " with pt = " << cand->pt() << endl;
        const pat::Muon* muon1 = dynamic_cast<const pat::Muon*>(cand->daughter("muon1"));
        const pat::Muon* muon2 = dynamic_cast<const pat::Muon*>(cand->daughter("muon2"));
 
        if ((muon1->charge() * muon2->charge()) > 0)
          continue;
        // global + global?
        if (muon1->isGlobalMuon() && muon2->isGlobalMuon()) {
          if (selGlobalMuon(muon1) && selGlobalMuon(muon2) && cand->userFloat("vProb") > 0.001) {
            collSelGG.push_back(cand);
            continue;
          }
        }
        // global + tracker? (x2)
        if (muon1->isGlobalMuon() && muon2->isTrackerMuon()) {
          if (selGlobalMuon(muon1) && selTrackerMuon(muon2) && cand->userFloat("vProb") > 0.001) {
            collSelGT.push_back(cand);
            continue;
          }
        }
        if (muon2->isGlobalMuon() && muon1->isTrackerMuon()) {
          if (selGlobalMuon(muon2) && selTrackerMuon(muon1) && cand->userFloat("vProb") > 0.001) {
            collSelGT.push_back(cand);
            continue;
          }
        }
        // tracker + tracker?
        if (muon1->isTrackerMuon() && muon2->isTrackerMuon()) {
          if (selTrackerMuon(muon1) && selTrackerMuon(muon2) && cand->userFloat("vProb") > 0.001) {
            collSelTT.push_back(cand);
            continue;
          }
        }
      }
    }
    // Split them in independent collections if using muonType_ == -2, -3 or -4. Take them all if muonType_ == -1.
    std::vector<reco::Track> tracks;
    if (!collSelGG.empty()) {
      //CHECK THAT THEY ARE ORDERED BY PT !!!!!!!!!!!!!!!!!!!!!!!
      const pat::Muon* muon1 = dynamic_cast<const pat::Muon*>(collSelGG[0]->daughter("muon1"));
      const pat::Muon* muon2 = dynamic_cast<const pat::Muon*>(collSelGG[0]->daughter("muon2"));
      if (muonType_ == -1 || muonType_ == -2) {
        tracks.push_back(*(muon1->innerTrack()));
        tracks.push_back(*(muon2->innerTrack()));
        collMuSel.push_back(muon1);
        collMuSel.push_back(muon2);
      }
    } else if (collSelGG.empty() && !collSelGT.empty()) {
      //CHECK THAT THEY ARE ORDERED BY PT !!!!!!!!!!!!!!!!!!!!!!!
      const pat::Muon* muon1 = dynamic_cast<const pat::Muon*>(collSelGT[0]->daughter("muon1"));
      const pat::Muon* muon2 = dynamic_cast<const pat::Muon*>(collSelGT[0]->daughter("muon2"));
      if (muonType_ == -1 || muonType_ == -3) {
        tracks.push_back(*(muon1->innerTrack()));
        tracks.push_back(*(muon2->innerTrack()));
        collMuSel.push_back(muon1);
        collMuSel.push_back(muon2);
      }
    } else if (collSelGG.empty() && collSelGT.empty() && !collSelTT.empty()) {
      //CHECK THAT THEY ARE ORDERED BY PT !!!!!!!!!!!!!!!!!!!!!!!
      const pat::Muon* muon1 = dynamic_cast<const pat::Muon*>(collSelTT[0]->daughter("muon1"));
      const pat::Muon* muon2 = dynamic_cast<const pat::Muon*>(collSelTT[0]->daughter("muon2"));
      if (muonType_ == -1 || muonType_ == -4) {
        tracks.push_back(*(muon1->innerTrack()));
        tracks.push_back(*(muon2->innerTrack()));
        collMuSel.push_back(muon1);
        collMuSel.push_back(muon2);
      }
    }
    if (tracks.size() != 2 && !tracks.empty()) {
      std::cout << "ERROR strange number of muons selected by onia cuts!" << std::endl;
      abort();
    }
    muons = fillMuonCollection(tracks);
  } else if ((muonType_ < 4 && muonType_ >= 0) || muonType_ >= 10) {  // Muons (glb,sta,trk)
    std::vector<reco::Track> tracks;
    if (PATmuons_ == true) {
      edm::Handle<pat::MuonCollection> allMuons;
      event.getByLabel(muonLabel_, allMuons);
      if (muonType_ == 0) {
        // Take directly the muon
        muons = fillMuonCollection(*allMuons);
      } else {
        for (std::vector<pat::Muon>::const_iterator muon = allMuons->begin(); muon != allMuons->end(); ++muon) {
          //std::cout<<"pat muon is global "<<muon->isGlobalMuon()<<std::endl;
          takeSelectedMuonType(muon, tracks);
        }
        muons = fillMuonCollection(tracks);
      }
    } else {
      edm::Handle<reco::MuonCollection> allMuons;
      event.getByLabel(muonLabel_, allMuons);
      if (muonType_ == 0) {
        // Take directly the muon
        muons = fillMuonCollection(*allMuons);
      } else {
        for (std::vector<reco::Muon>::const_iterator muon = allMuons->begin(); muon != allMuons->end(); ++muon) {
          takeSelectedMuonType(muon, tracks);
        }
        muons = fillMuonCollection(tracks);
      }
    }
  } else if (muonType_ == 4) {  //CaloMuons
    edm::Handle<reco::CaloMuonCollection> caloMuons;
    event.getByLabel(muonLabel_, caloMuons);
    std::vector<reco::Track> tracks;
    for (std::vector<reco::CaloMuon>::const_iterator muon = caloMuons->begin(); muon != caloMuons->end(); ++muon) {
      tracks.push_back(*(muon->track()));
    }
    muons = fillMuonCollection(tracks);
  }
 
  else if (muonType_ == 5) {  // Inner tracker tracks
    edm::Handle<reco::TrackCollection> tracks;
    event.getByLabel(muonLabel_, tracks);
    muons = fillMuonCollection(*tracks);
  }
  plotter->fillRec(muons);
 
  // Generation and simulation part
  if (speedup_ == false) {
    if (PATmuons_) {
      // EM 2015.04.02 temporary fix to run on MINIAODSIM (which contains PAT muons) but not the "onia2MuMuPatTrkTrk" collection
      // selectGeneratedMuons(collAll, collMuSel, genPair, plotter);
      selectGenSimMuons(event, genPair, simPair, plotter);
    } else {
      selectGenSimMuons(event, genPair, simPair, plotter);
    }
  }
}
 
void MuScleFitMuonSelector::selectGeneratedMuons(const edm::Handle<pat::CompositeCandidateCollection>& collAll,
                                                 const std::vector<const pat::Muon*>& collMuSel,
                                                 std::vector<GenMuonPair>& genPair,
                                                 MuScleFitPlotter* plotter) {
  reco::GenParticleCollection genPatParticles{};
 
  //explicitly for JPsi but can be adapted!!!!!
  for (std::vector<pat::CompositeCandidate>::const_iterator it = collAll->begin(); it != collAll->end(); ++it) {
    reco::GenParticleRef genJpsi = it->genParticleRef();
    bool isMatched = (genJpsi.isAvailable() && genJpsi->pdgId() == 443);
    if (isMatched) {
      genPatParticles.push_back(*genJpsi.get());
    }
  }
 
  if (collMuSel.size() == 2) {
    reco::GenParticleRef genMu1 = collMuSel[0]->genParticleRef();
    reco::GenParticleRef genMu2 = collMuSel[1]->genParticleRef();
    bool isMuMatched = (genMu1.isAvailable() && genMu2.isAvailable() && genMu1->pdgId() * genMu2->pdgId() == -169);
    if (isMuMatched) {
      genPatParticles.push_back(*genMu1.get());
      genPatParticles.push_back(*genMu2.get());
 
      unsigned int motherId = 0;
      if (genMu1->mother() != nullptr) {
        motherId = genMu1->mother()->pdgId();
      }
      if (genMu1->pdgId() == 13)
        genPair.push_back(GenMuonPair(genMu1.get()->p4(), genMu2.get()->p4(), motherId));
      else
        // genPair.push_back(std::make_pair(genMu2.get()->p4(),genMu1.get()->p4()) );
        genPair.push_back(GenMuonPair(genMu2.get()->p4(), genMu1.get()->p4(), motherId));
 
      plotter->fillGen(genPatParticles, true);
 
      if (debug_ > 0)
        std::cout << "Found genParticles in PAT" << std::endl;
    } else {
      std::cout << "No recomuon selected so no access to generated info" << std::endl;
      // Fill it in any case, otherwise it will not be in sync with the event number
      // genPair.push_back( std::make_pair( lorentzVector(0.,0.,0.,0.), lorentzVector(0.,0.,0.,0.) ) );
      genPair.push_back(GenMuonPair(lorentzVector(0., 0., 0., 0.), lorentzVector(0., 0., 0., 0.), 0));
    }
  } else {
    std::cout << "No recomuon selected so no access to generated info" << std::endl;
    // Fill it in any case, otherwise it will not be in sync with the event number
    // genPair.push_back( std::make_pair( lorentzVector(0.,0.,0.,0.), lorentzVector(0.,0.,0.,0.) ) );
    genPair.push_back(GenMuonPair(lorentzVector(0., 0., 0., 0.), lorentzVector(0., 0., 0., 0.), 0));
  }
  if (debug_ > 0) {
    std::cout << "genParticles:" << std::endl;
    // std::cout << genPair.back().first << " , " << genPair.back().second << std::endl;
    std::cout << genPair.back().mu1 << " , " << genPair.back().mu2 << std::endl;
  }
}
 
void MuScleFitMuonSelector::selectGenSimMuons(const edm::Event& event,
                                              std::vector<GenMuonPair>& genPair,
                                              std::vector<std::pair<lorentzVector, lorentzVector> >& simPair,
                                              MuScleFitPlotter* plotter) {
  // Find and store in histograms the generated and simulated resonance and muons
  // ----------------------------------------------------------------------------
  edm::Handle<edm::HepMCProduct> evtMC;
  edm::Handle<reco::GenParticleCollection> genParticles;
 
  // Fill gen information only in the first loop
  bool ifHepMC = false;
 
  event.getByLabel(genParticlesName_, evtMC);
  event.getByLabel(genParticlesName_, genParticles);
  if (evtMC.isValid()) {
    genPair.push_back(findGenMuFromRes(evtMC.product()));
    plotter->fillGen(*evtMC, sherpa_);
    ifHepMC = true;
    if (debug_ > 0)
      std::cout << "Found hepMC" << std::endl;
  } else if (genParticles.isValid()) {
    genPair.push_back(findGenMuFromRes(genParticles.product()));
    plotter->fillGen(*genParticles);
    if (debug_ > 0)
      std::cout << "Found genParticles" << std::endl;
  } else {
    std::cout << "ERROR "
              << "non generation info and speedup true!!!!!!!!!!!!" << std::endl;
    // Fill it in any case, otherwise it will not be in sync with the event number
    // genPair.push_back( std::make_pair( lorentzVector(0.,0.,0.,0.), lorentzVector(0.,0.,0.,0.) ) );
    genPair.push_back(GenMuonPair(lorentzVector(0., 0., 0., 0.), lorentzVector(0., 0., 0., 0.), 0));
  }
  if (debug_ > 0) {
    std::cout << "genParticles:" << std::endl;
    std::cout << genPair.back().mu1 << " , " << genPair.back().mu2 << std::endl;
  }
  selectSimulatedMuons(event, ifHepMC, evtMC, simPair, plotter);
}
 
void MuScleFitMuonSelector::selectSimulatedMuons(const edm::Event& event,
                                                 const bool ifHepMC,
                                                 edm::Handle<edm::HepMCProduct> evtMC,
                                                 std::vector<std::pair<lorentzVector, lorentzVector> >& simPair,
                                                 MuScleFitPlotter* plotter) {
  edm::Handle<edm::SimTrackContainer> simTracks;
  bool simTracksFound = false;
  event.getByLabel(simTracksCollectionName_, simTracks);
  if (simTracks.isValid()) {
    plotter->fillSim(simTracks);
    if (ifHepMC) {
      simPair.push_back(findSimMuFromRes(evtMC, simTracks));
      simTracksFound = true;
      plotter->fillGenSim(evtMC, simTracks);
    }
  } else {
    std::cout << "SimTracks not existent" << std::endl;
  }
  if (!simTracksFound) {
    simPair.push_back(std::make_pair(lorentzVector(0., 0., 0., 0.), lorentzVector(0., 0., 0., 0.)));
  }
}
 
GenMuonPair MuScleFitMuonSelector::findGenMuFromRes(const edm::HepMCProduct* evtMC) {
  const HepMC::GenEvent* Evt = evtMC->GetEvent();
  GenMuonPair muFromRes;
  //Loop on generated particles
  for (HepMC::GenEvent::particle_const_iterator part = Evt->particles_begin(); part != Evt->particles_end(); part++) {
    if (std::abs((*part)->pdg_id()) == 13 && (*part)->status() == 1) {
      bool fromRes = false;
      unsigned int motherPdgId = 0;
      for (HepMC::GenVertex::particle_iterator mother = (*part)->production_vertex()->particles_begin(HepMC::ancestors);
           mother != (*part)->production_vertex()->particles_end(HepMC::ancestors);
           ++mother) {
        motherPdgId = (*mother)->pdg_id();
 
        // For sherpa the resonance is not saved. The muons from the resonance can be identified
        // by having as mother a muon of status 3.
        if (sherpa_) {
          if (motherPdgId == 13 && (*mother)->status() == 3)
            fromRes = true;
        } else {
          for (int ires = 0; ires < 6; ++ires) {
            if (motherPdgId == motherPdgIdArray[ires] && resfind_[ires])
              fromRes = true;
          }
        }
      }
      if (fromRes) {
        if ((*part)->pdg_id() == 13) {
          //   muFromRes.first = (*part)->momentum();
          muFromRes.mu1 = (lorentzVector(
              (*part)->momentum().px(), (*part)->momentum().py(), (*part)->momentum().pz(), (*part)->momentum().e()));
        } else {
          muFromRes.mu2 = (lorentzVector(
              (*part)->momentum().px(), (*part)->momentum().py(), (*part)->momentum().pz(), (*part)->momentum().e()));
        }
        muFromRes.motherId = motherPdgId;
      }
    }
  }
  return muFromRes;
}
 
// std::pair<lorentzVector, lorentzVector> MuScleFitMuonSelector::findGenMuFromRes( const reco::GenParticleCollection* genParticles)
GenMuonPair MuScleFitMuonSelector::findGenMuFromRes(const reco::GenParticleCollection* genParticles) {
  // std::pair<lorentzVector,lorentzVector> muFromRes;
  GenMuonPair muFromRes;
 
  //Loop on generated particles
  if (debug_ > 0)
    std::cout << "Starting loop on " << genParticles->size() << " genParticles" << std::endl;
  for (reco::GenParticleCollection::const_iterator part = genParticles->begin(); part != genParticles->end(); ++part) {
    if (debug_ > 0)
      std::cout << "genParticle has pdgId = " << std::abs(part->pdgId()) << " and status = " << part->status()
                << std::endl;
    if (std::abs(part->pdgId()) == 13) {  // && part->status()==3) {
      bool fromRes = false;
      unsigned int motherPdgId = part->mother()->pdgId();
      if (debug_ > 0) {
        std::cout << "Found a muon with mother: " << motherPdgId << std::endl;
      }
      for (int ires = 0; ires < 6; ++ires) {
        // if( motherPdgId == motherPdgIdArray[ires] && resfind_[ires] ) fromRes = true; // changed by EM 2015.07.30
        // begin of comment
        // the list of resonances motherPdgIdArray does not contain the photon (PdgId = 21) while ~1% of the
        // mu+mu- events in the range [50,120] GeV has a photon as the mother.
        // It needs to be fixed without spoiling the logic of the selection of different resonances
        // e.g. mixing up onia etc.
        // end of comment
        if ((motherPdgId == motherPdgIdArray[ires] && resfind_[ires]) || motherPdgId == 21)
          fromRes = true;
      }
      if (fromRes) {
        if (debug_ > 0)
          std::cout << "fromRes = true, motherPdgId = " << motherPdgId << std::endl;
        const reco::Candidate* status3Muon = &(*part);
        const reco::Candidate* status1Muon = getStatus1Muon(status3Muon);
        if (part->pdgId() == 13) {
          if (status1Muon->p4().pt() != 0)
            muFromRes.mu1 = MuScleFitMuon(status1Muon->p4(), -1);
          else
            muFromRes.mu1 = MuScleFitMuon(status3Muon->p4(), -1);
          if (debug_ > 0)
            std::cout << "Found a genMuon - : " << muFromRes.mu1 << std::endl;
          //      muFromRes.first = (lorentzVector(status1Muon->p4().px(),status1Muon->p4().py(),
          //                       status1Muon->p4().pz(),status1Muon->p4().e()));
        } else {
          if (status1Muon->p4().pt() != 0)
            muFromRes.mu2 = MuScleFitMuon(status1Muon->p4(), +1);
          else
            muFromRes.mu2 = MuScleFitMuon(status3Muon->p4(), +1);
          if (debug_ > 0)
            std::cout << "Found a genMuon + : " << muFromRes.mu2 << std::endl;
          //      muFromRes.second = (lorentzVector(status1Muon->p4().px(),status1Muon->p4().py(),
          //                        status1Muon->p4().pz(),status1Muon->p4().e()));
        }
        muFromRes.motherId = motherPdgId;
      }
    }
  }
  return muFromRes;
}
 
std::pair<lorentzVector, lorentzVector> MuScleFitMuonSelector::findSimMuFromRes(
    const edm::Handle<edm::HepMCProduct>& evtMC, const edm::Handle<edm::SimTrackContainer>& simTracks) {
  //Loop on simulated tracks
  std::pair<lorentzVector, lorentzVector> simMuFromRes;
  for (edm::SimTrackContainer::const_iterator simTrack = simTracks->begin(); simTrack != simTracks->end(); ++simTrack) {
    //Chose muons
    if (std::abs((*simTrack).type()) == 13) {
      //If tracks from IP than find mother
      if ((*simTrack).genpartIndex() > 0) {
        HepMC::GenParticle* gp = evtMC->GetEvent()->barcode_to_particle((*simTrack).genpartIndex());
        if (gp != nullptr) {
          for (HepMC::GenVertex::particle_iterator mother = gp->production_vertex()->particles_begin(HepMC::ancestors);
               mother != gp->production_vertex()->particles_end(HepMC::ancestors);
               ++mother) {
            bool fromRes = false;
            unsigned int motherPdgId = (*mother)->pdg_id();
            for (int ires = 0; ires < 6; ++ires) {
              if ((motherPdgId == motherPdgIdArray[ires] && resfind_[ires]) || motherPdgId == 21)
                fromRes = true;
            }
            if (fromRes) {
              if (gp->pdg_id() == 13)
                simMuFromRes.first = lorentzVector(simTrack->momentum().px(),
                                                   simTrack->momentum().py(),
                                                   simTrack->momentum().pz(),
                                                   simTrack->momentum().e());
              else
                simMuFromRes.second = lorentzVector(simTrack->momentum().px(),
                                                    simTrack->momentum().py(),
                                                    simTrack->momentum().pz(),
                                                    simTrack->momentum().e());
            }
          }
        }
        // else LogDebug("MuScleFitUtils") << "WARNING: no matching genParticle found for simTrack" << std::endl;
      }
    }
  }
  return simMuFromRes;
}