FlowElement_LinkerPlots.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "PFOHistUtils/FlowElement_LinkerPlots.h"
#include "xAODMuon/MuonContainer.h"
#include "xAODEgamma/ElectronContainer.h"
#include "xAODEgamma/PhotonContainer.h"
#include "xAODTau/TauJetContainer.h"
#include "AthLinks/ElementLink.h"
 
namespace PFO {
 
  FlowElement_LinkerPlots::FlowElement_LinkerPlots(PlotBase* pParent, const std::string & sDir, const std::string & sFEContainerName, bool doNeutralFE): 
    PlotBase(pParent, sDir),
    m_sFEContainerName(sFEContainerName),
    m_doNeutralFE(doNeutralFE)
    {
    }
 
  void FlowElement_LinkerPlots::initializePlots(){
    // init only the histograms we're going to use (m_doNeutralFE is the switch)
    //tau
    if(m_sFEContainerName==""){ // skip init if container not used.
      return;
    }
    if(!m_doNeutralFE){
      m_CFE_tau_dR=Book1D("_CFE_tau_dR",m_sFEContainerName+"_CFE_tau_dR",10,0,1); 
      m_CFE_tau_NMatchedTau=Book1D("_CFE_tau_NMatchedTau",m_sFEContainerName+"_CFE_tau_NMatchedTau",5,0,5);
    }
    else{
      m_NFE_tau_dR=Book1D("_NFE_tau_dR",m_sFEContainerName+"_NFE_tau_dR",10,0,1); 
      m_NFE_tau_NMatchedTau=Book1D("_NFE_tau_NMatchedTau",m_sFEContainerName+"_NFE_tau_NMatchedTau",5,0,5);
    }
    //electron
    if(!m_doNeutralFE){
      m_CFE_electron_dR=Book1D("_CFE_electron_dR",m_sFEContainerName+"_CFE_electron_dR",15,0,1.5); 
      m_CFE_electron_NMatchedElectron=Book1D("_CFE_electron_NMatchedElectron",m_sFEContainerName+"_CFE_electron_NMatchedElectron",10,0,10);
    }
    else{
      m_NFE_electron_dR=Book1D("_NFE_electron_dR",m_sFEContainerName+"_NFE_electron_dR",10,0,1); 
      m_NFE_electron_NMatchedElectron=Book1D("_NFE_electron_NMatchedElectron",m_sFEContainerName+"_NFE_electron_NMatchedElectron",5,0,5);
    }
    //muon
    if(!m_doNeutralFE){
      m_CFE_muon_dR=Book1D("_CFE_muon_dR",m_sFEContainerName+"_CFE_muon_dR",10,0,1); 
      m_CFE_muon_NMatchedMuon=Book1D("_CFE_muon_NMatchedMuon",m_sFEContainerName+"_CFE_muon_NMatchedMuon",5,0,5);
      m_CFE_muon_largeDR_debug_author=Book1D("_CFE_muon_largeDR_debug_author",m_sFEContainerName+"_CFE_muon_largeDR_debug_author",20,0,20);
      m_CFE_muon_largeDR_debug_type=Book1D("_CFE_muon_largeDR_debug_type",m_sFEContainerName+"_CFE_muon_largeDR_debug_type",20,0,20);
    }
    else{
      m_NFE_muon_dR=Book1D("_NFE_muon_dR",m_sFEContainerName+"_NFE_muon_dR",10,0,1); 
      m_NFE_muon_NMatchedMuon=Book1D("_NFE_muon_NMatchedMuon",m_sFEContainerName+"_NFE_muon_NMatchedMuon",10,0,10);
    }
    //photon
    if(!m_doNeutralFE){
      m_CFE_photon_dR=Book1D("_CFE_photon_dR",m_sFEContainerName+"_CFE_photon_dR",10,0,1); 
      m_CFE_photon_NMatchedPhoton=Book1D("_CFE_photon_NMatchedPhoton",m_sFEContainerName+"_CFE_photon_NMatchedPhoton",5,0,5);
    }
    else{
      m_NFE_photon_dR=Book1D("_NFE_photon_dR",m_sFEContainerName+"_NFE_photon_dR",10,0,1); 
      m_NFE_photon_NMatchedPhoton=Book1D("_NFE_photon_NMatchedPhoton",m_sFEContainerName+"_NFE_photon_NMatchedPhoton",5,0,5);
    }
  }
  void FlowElement_LinkerPlots::fill(const xAOD::FlowElement& FE, const xAOD::EventInfo& eventInfo){
    // methods work for both CFE and NFE since the auxvars are named the same
    SG::ConstAccessor< std::vector < ElementLink< xAOD::MuonContainer > > > acc_muon_FE_Link("FE_MuonLinks");
    SG::ConstAccessor< std::vector < ElementLink< xAOD::PhotonContainer > > > acc_photon_FE_Link("FE_PhotonLinks");
    SG::ConstAccessor< std::vector < ElementLink< xAOD::ElectronContainer > > > acc_electron_FE_Link("FE_ElectronLinks");
    SG::ConstAccessor< std::vector < ElementLink< xAOD::TauJetContainer > > > acc_tau_FE_Link("FE_TauLinks");
    
    TLorentzVector FE_fourvec=FE.p4();
    // Muon block
    if(acc_muon_FE_Link.isAvailable(FE)){
      std::vector< ElementLink < xAOD::MuonContainer > > MuonLinks=acc_muon_FE_Link(FE);
      int nMuons_per_FE=MuonLinks.size();
      if(nMuons_per_FE>0){ // skip cases w/o match
        if(m_doNeutralFE)
          m_NFE_muon_NMatchedMuon->Fill(nMuons_per_FE,eventInfo.beamSpotWeight());
        else
          m_CFE_muon_NMatchedMuon->Fill(nMuons_per_FE,eventInfo.beamSpotWeight());  
      }
            
      for (ElementLink<xAOD::MuonContainer> MuonLink: MuonLinks){
 
          //get Muon from link by de-referencing it
        if (!MuonLink.isValid()){
          std::cerr << "FlowElement_LinkerPlots encountered an invalid muon element link. Skipping. "<<std::endl;
          continue; 
        }
          const xAOD::Muon* muon = *MuonLink;
          TLorentzVector muon_fourvec=muon->p4();
          double deltaR=muon_fourvec.DeltaR(FE_fourvec);
          if(muon->muonType()==xAOD::Muon::MuonType::SiliconAssociatedForwardMuon) // skip forward muons, as have tracklets which mis-link to FE.
          continue;
          if(m_doNeutralFE)
            m_NFE_muon_dR->Fill(deltaR,eventInfo.beamSpotWeight());
          else{
            m_CFE_muon_dR->Fill(deltaR,eventInfo.beamSpotWeight());
        if(deltaR>1){// should never happen, but catch for extreme cases
              int auth=static_cast<int>(muon->author());
              int type=static_cast<int>(muon->muonType());
              m_CFE_muon_largeDR_debug_author->Fill(auth,eventInfo.beamSpotWeight());
              m_CFE_muon_largeDR_debug_type->Fill(type,eventInfo.beamSpotWeight());
          } 
        }// end of CFE fill block for muon_dR code  
      }
    }// end of muon acc block
     
    // Electron block
    if(acc_electron_FE_Link.isAvailable(FE)){
      std::vector< ElementLink < xAOD::ElectronContainer > > ElectronLinks=acc_electron_FE_Link(FE);
      int nElectrons_per_FE=ElectronLinks.size();
      if(nElectrons_per_FE>0){ // skip cases w/o match
          if(m_doNeutralFE)
            m_NFE_electron_NMatchedElectron->Fill(nElectrons_per_FE,eventInfo.beamSpotWeight());
          else
            m_CFE_electron_NMatchedElectron->Fill(nElectrons_per_FE,eventInfo.beamSpotWeight());    
      }
 
      for (ElementLink<xAOD::ElectronContainer> ElectronLink: ElectronLinks){
          //get Electron from link by de-referencing it
        if (!ElectronLink.isValid()){
          std::cerr << "FlowElement_LinkerPlots encountered an invalid electron element link. Skipping. "<<std::endl;
          continue; 
        }
          const xAOD::Electron* electron = *ElectronLink;
          TLorentzVector electron_fourvec=electron->p4();
          double deltaR=electron_fourvec.DeltaR(FE_fourvec);
          if(m_doNeutralFE)
            m_NFE_electron_dR->Fill(deltaR,eventInfo.beamSpotWeight());
          else
            m_CFE_electron_dR->Fill(deltaR,eventInfo.beamSpotWeight()); 
      }
    }// end of electron acc block
    
    // Photon block
    if(acc_photon_FE_Link.isAvailable(FE)){
      std::vector< ElementLink < xAOD::PhotonContainer > > PhotonLinks=acc_photon_FE_Link(FE);
      int nPhotons_per_FE=PhotonLinks.size();
      if(nPhotons_per_FE>0){ // skip cases w/o match
        if(m_doNeutralFE)
            m_NFE_photon_NMatchedPhoton->Fill(nPhotons_per_FE,eventInfo.beamSpotWeight());
          else
            m_CFE_photon_NMatchedPhoton->Fill(nPhotons_per_FE,eventInfo.beamSpotWeight());  
      }
 
      for (ElementLink<xAOD::PhotonContainer> PhotonLink: PhotonLinks){
      //get Photon from link by de-referencing it
      if (!PhotonLink.isValid()){
        std::cerr << "FlowElement_LinkerPlots encountered an invalid photon element link. Skipping. "<<std::endl;
        continue; 
      }
        const xAOD::Photon* photon = *PhotonLink;
        TLorentzVector photon_fourvec=photon->p4();
        double deltaR=photon_fourvec.DeltaR(FE_fourvec);
        if(m_doNeutralFE)
          m_NFE_photon_dR->Fill(deltaR,eventInfo.beamSpotWeight());
        else
          m_CFE_photon_dR->Fill(deltaR,eventInfo.beamSpotWeight()); 
      }
    }// end of photon acc block
 
    // Taujet block
    if(acc_tau_FE_Link.isAvailable(FE)){
      std::vector< ElementLink < xAOD::TauJetContainer > > TaujetLinks=acc_tau_FE_Link(FE);
      int nTaujets_per_FE=TaujetLinks.size();
      if(nTaujets_per_FE>0){ // skip cases w/o match
        if(m_doNeutralFE)
            m_NFE_tau_NMatchedTau->Fill(nTaujets_per_FE,eventInfo.beamSpotWeight());
          else
            m_CFE_tau_NMatchedTau->Fill(nTaujets_per_FE,eventInfo.beamSpotWeight());    
      }
      
      TLorentzVector FE_fourvec=FE.p4();
      for (ElementLink<xAOD::TauJetContainer> TaujetLink: TaujetLinks){
          //get Taujet from link by de-referencing it
        if (!TaujetLink.isValid()){
          std::cerr << "FlowElement_LinkerPlots encountered an invalid tau jet element link. Skipping. "<<std::endl;
          continue; 
        }
          const xAOD::TauJet* taujet = *TaujetLink;
          TLorentzVector taujet_fourvec=taujet->p4();
          double deltaR=taujet_fourvec.DeltaR(FE_fourvec);
          if(m_doNeutralFE)
            m_NFE_tau_dR->Fill(deltaR,eventInfo.beamSpotWeight());
          else
            m_CFE_tau_dR->Fill(deltaR,eventInfo.beamSpotWeight());  
      }
    }// end of taujet acc block    
  } // end of fill statement
} // end of PFO namespace