PFOPVMatchedPlots.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "PFOHistUtils/PFOPVMatchedPlots.h"
#include "xAODTracking/TrackParticle.h"
#include "AthenaKernel/Units.h"
 
namespace PFO {
 
  PFOPVMatchedPlots::PFOPVMatchedPlots(PlotBase* pParent, const std::string & sDir, const std::string & sFEContainerName) : PlotBase(pParent, sDir), m_sFEContainerName(sFEContainerName){    
   
  }
 
  void PFOPVMatchedPlots::initializePlots(){    
    //book Flow Element histograms
    if(!m_sFEContainerName.empty()){
      m_FE_pt = Book1D("_PVMatched_Pt",m_sFEContainerName + "_Pt (Entries/1 GeV)",30,-10.0,20.0);
      m_FE_eta = Book1D("_PVMatched_Eta",m_sFEContainerName + "_Eta (Entries/0.1)",100,-5.0,5.0);
      m_FE_phi = Book1D("_PVMatched_Phi",m_sFEContainerName + "_Phi (Entries/0.1)",64,-3.2,3.2);
      m_FE_m = Book1D("_PVMatched_m",m_sFEContainerName + "_m (Entries/100 MeV)",10,0.0,0.5);
      m_FE_charge = Book1D("_PVMatched_charge",m_sFEContainerName + "_charge (Entries/unit charge)",5,-2,2);
    
      m_FE_pt_etaBinA = Book1D("_Pt_PVMatched_A",m_sFEContainerName + "_Pt (Entries/1 GeV, |eta| < 1 )",30,-10.0,20.0);
      m_FE_pt_etaBinB = Book1D("_Pt_PVMatched_B",m_sFEContainerName + "_Pt (Entries/1 GeV,  1 <= |eta| < 2 )",30,-10.0,20.0);
      m_FE_pt_etaBinC = Book1D("_Pt_PVMatched_C",m_sFEContainerName + "_Pt (Entries/1 GeV, |eta| >= 2 )",30,-10.0,20.0);      
    }
  }
 
  void PFOPVMatchedPlots::fill(const xAOD::FlowElement& FE,  const xAOD::Vertex& theVertex, const xAOD::EventInfo& eventInfo){
    if(FE.nChargedObjects()==0)
      return;
    const xAOD::TrackParticle* theTrack =static_cast<const xAOD::TrackParticle*>(FE.chargedObjects().at(0));
 
    if (theTrack){    
      //vtz.z() provides z of that vertex w.r.t the center of the beamspot (z = 0). Thus we corrext the track z0 to be w.r.t z = 0
      float z0 = theTrack->z0() + theTrack->vz();
      z0 = z0 - theVertex.z();
      float theta = theTrack->theta();
      if ( std::abs(z0*sin(theta)) < 2.0 ){
        m_FE_pt->Fill(FE.pt()/Athena::Units::GeV,eventInfo.beamSpotWeight());
        m_FE_eta->Fill(FE.eta(),eventInfo.beamSpotWeight());
        m_FE_phi->Fill(FE.phi(),eventInfo.beamSpotWeight());
        m_FE_m->Fill(FE.m()/Athena::Units::GeV,eventInfo.beamSpotWeight());
        m_FE_charge->Fill(FE.charge(),eventInfo.beamSpotWeight());
 
        if (std::abs(FE.eta()) < 1)  m_FE_pt_etaBinA->Fill(FE.pt()/Athena::Units::GeV,eventInfo.beamSpotWeight());
        else if (std::abs(FE.eta()) < 2) m_FE_pt_etaBinB->Fill(FE.pt()/Athena::Units::GeV,eventInfo.beamSpotWeight());
        else m_FE_pt_etaBinC->Fill(FE.pt()/Athena::Units::GeV,eventInfo.beamSpotWeight());
      }//fill histograms if track is matched to the PV
    }//if valid pointer to track
  } 
 
 
}