PFRadialEnergyCalculatorTool.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#include "PFRadialEnergyCalculatorTool.h"
 
#include "eflowCellList.h"
#include "eflowRecCluster.h"
#include "eflowRecTrack.h"
#include "eflowRingThicknesses.h"
#include "eflowSubtractor.h"
#include "eflowTrackClusterLink.h"
#include "xAODCaloEvent/CaloCluster.h"
 
StatusCode PFRadialEnergyCalculatorTool::execute(const EventContext& /*ctx*/, eflowCaloObjectContainer& theEflowCaloObjectContainer){
 
  ATH_MSG_DEBUG("Accessed radial energy profile function");
 
  for (auto thisEflowCaloObject : theEflowCaloObjectContainer){
 
    //If there are no clusters available then we cannot calculate any calorimeter shower profiles
    if (thisEflowCaloObject->nClusters() < 1 ) continue;
 
    const std::vector<std::pair<eflowTrackClusterLink*,std::pair<float,float> > > matchedTrackList = thisEflowCaloObject->efRecLink();
 
    for(const auto& track: matchedTrackList){
 
      eflowRecTrack* efRecTrack = (track.first)->getTrack();
          
      std::vector<eflowRecCluster*> matchedClusters;
      const std::vector<eflowTrackClusterLink*>& links = efRecTrack->getClusterMatches();
      for (auto *thisEFlowTrackClusterLink : links) matchedClusters.push_back(thisEFlowTrackClusterLink->getCluster());
 
      std::vector<std::pair<xAOD::CaloCluster*, bool> > clusterSubtractionList;
      clusterSubtractionList.reserve(matchedClusters.size());
      for (auto *thisEFlowRecCluster : matchedClusters) clusterSubtractionList.emplace_back(thisEFlowRecCluster->getCluster(),false);
 
      eflowCellList calorimeterCellList;
      eflowSubtract::Subtractor::makeOrderedCellList(efRecTrack->getTrackCaloPoints(),clusterSubtractionList,calorimeterCellList);
      
      std::vector<int> layerToStoreVector;
      std::vector<float> radiusToStoreVector;
      std::vector<float> avgEdensityToStoreVector;
 
      //Loop over calorimeter layers and in each layer we will calculate radial energy profiles.
      for (int i=0; i < eflowCalo::nRegions ;i++){
    
        eflowCaloENUM layer = (eflowCaloENUM)i;
        ATH_MSG_DEBUG("layer is "<<layer);
        double ringThickness = eflowRingThicknesses::ringThickness((eflowCaloENUM)i);
        ATH_MSG_DEBUG("ring thickness is "<<ringThickness);
    
        double eta_extr = calorimeterCellList.etaFF(layer);
        ATH_MSG_DEBUG("extrapolated eta ["<<layer<<"] is "<<eta_extr);
        double phi_extr = calorimeterCellList.phiFF(layer);
        ATH_MSG_DEBUG("extrapolated phi ["<<layer<<"] is "<<phi_extr);
    
        if (eta_extr == -999.0){
          continue;
        }
                
        //Loop over rings of calorimeter cells going out in increasing radius from the track impact point in this calorimeter layer
        for (unsigned  int indexOfRing = 0; indexOfRing < 100; indexOfRing++){
 
          CellIt beginRing = calorimeterCellList.getLowerBound((eflowCaloENUM)i, ringThickness*(indexOfRing));
          if(beginRing == calorimeterCellList.end()) break;
 
          int totalCellsinRing = 0;
          double totalEnergyPerRing = 0;
          double energyDensityPerRing = 0;
          double averageEnergyDensityPerRing = 0;
 
          //Get the list of calorimeter cells in this cell ring
          const std::vector<std::pair<const CaloCell*,int> >& tempVector = (*beginRing).second;
 
          //Loop over the calorimeter cells in this cell ring and calculate total and average energy densities in this cell ring.
          for (const auto& thisPair : tempVector){
            const CaloDetDescrElement* DDE = (thisPair.first)->caloDDE();
              CaloCell_ID::CaloSample sampling = DDE->getSampling();
 
            if(eflowCalo::translateSampl(sampling)!=(eflowCaloENUM)i) break;
 
            ATH_MSG_DEBUG(" cell eta and phi are " << (thisPair.first)->eta() << " and " << (thisPair.first)->phi() << " with index " << thisPair.second << " and sampling of " << sampling);
              ATH_MSG_DEBUG(" cell energy is " << (thisPair.first)->energy());
            
            totalCellsinRing += 1;
        
            totalEnergyPerRing += (thisPair.first)->energy();
            double totalEnergyCell = (thisPair.first)->energy();
            ATH_MSG_DEBUG(" Total E per Cell is " << totalEnergyCell);
            ATH_MSG_DEBUG(" Total E per Ring is " << totalEnergyPerRing);
        
            double cellVolume = DDE->volume();
            ATH_MSG_DEBUG(" cell volume is " << cellVolume/1000.);
        
            double energyDensityCell = totalEnergyCell/(cellVolume/1000.);
            ATH_MSG_DEBUG(" E density per Cell is " << energyDensityCell);
            ATH_MSG_DEBUG(" Initial added E density per Cell is " << energyDensityPerRing);
            energyDensityPerRing += energyDensityCell;
            ATH_MSG_DEBUG(" Final added E density per Cell is " << energyDensityPerRing);
            averageEnergyDensityPerRing = energyDensityPerRing/((totalCellsinRing)*(efRecTrack->getTrack()->e()/1000.));
 
          }
 
          ATH_MSG_DEBUG(" track eta is " << efRecTrack->getTrack()->eta());
          ATH_MSG_DEBUG(" track E is " << efRecTrack->getTrack()->e()/1000.);
          ATH_MSG_DEBUG(" Average E density per Ring is " << averageEnergyDensityPerRing);
      
          //Fill up the vectors with energy density, layer and ring radii
          if (averageEnergyDensityPerRing != 0){
            avgEdensityToStoreVector.push_back(averageEnergyDensityPerRing);
            int layerToStore = (eflowCaloENUM)i;
            ATH_MSG_DEBUG("layerToStore is "<< layerToStore);
            layerToStoreVector.push_back(layerToStore);
            double radiusToStore = (indexOfRing)*ringThickness;
            ATH_MSG_DEBUG("radiusToStore is "<< radiusToStore);
            radiusToStoreVector.push_back(radiusToStore);
          }
          else {ATH_MSG_DEBUG("averageEnergyDensityPerRing = 0");}
 
        }//loop over rings of calorimeter cells
 
      }//loop over the calorimeter layers
 
      //Add the vectors with energy density, layer and ring radii to this eflowRecTrack
      efRecTrack->setLayerCellOrderVector(layerToStoreVector);
      efRecTrack->setRadiusCellOrderVector(radiusToStoreVector);
      efRecTrack->setAvgEDensityCellOrderVector(avgEdensityToStoreVector);
 
    }//loop over tracks matched to clusters
 
  }//loop on eflowCaloObjectContainer
 
  return StatusCode::SUCCESS;
}