eflowCaloObject.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
/********************************************************************
 
NAME:     eflowCaloObject.cxx
PACKAGE:  offline/Reconstruction/eflowRec
 
AUTHORS:  D.R.Tovey, M.Hodgkinson and T.Velz
CREATED:  22nd November, 2004
 
********************************************************************/
 
#include "eflowCaloObject.h"
#include "eflowRecTrack.h"
#include "eflowRecCluster.h"
#include "eflowTrackClusterLink.h"
#include "eflowLayerIntegrator.h"
#include "eflowEEtaBinnedParameters.h"
#include "eflowRingSubtractionManager.h"
#include "PFEnergyPredictorTool.h"
 
#include "GaudiKernel/EventContext.h"
 
eflowCaloObject::~eflowCaloObject() = default;
 
void eflowCaloObject::addTrackClusterLinks(const std::vector<eflowTrackClusterLink*> &trackClusterLink) {
  for (auto *ptr : trackClusterLink) {
    addTrackClusterLink(ptr);
  }
}
 
  void eflowCaloObject::addTracks(const std::vector<eflowRecTrack*> &tracks) {
    m_eflowRecTracks.insert(m_eflowRecTracks.end(), tracks.begin(), tracks.end());
  }
 
  void eflowCaloObject::addClusters(const std::vector<eflowRecCluster*> &clusters) {
    m_eflowRecClusters.insert(m_eflowRecClusters.end(), clusters.begin(), clusters.end());
  }
 
 double eflowCaloObject::getExpectedEnergy() const {
  double expectedEnergy(0.0);
  for(unsigned iTrack=0; iTrack < nTracks(); ++iTrack) {
    if (!efRecTrack(iTrack)->isInDenseEnvironment()) expectedEnergy += efRecTrack(iTrack)->getEExpect();
  }
  return expectedEnergy;
}
 
double eflowCaloObject::getExpectedVariance() const {
  double expectedVariance(0.0);
  for(unsigned iTrack=0; iTrack < nTracks(); ++iTrack) {
    if (!efRecTrack(iTrack)->isInDenseEnvironment()) expectedVariance += efRecTrack(iTrack)->getVarEExpect();
  }
  return expectedVariance;
}
 
double eflowCaloObject::getClusterEnergy() const {
  double clusterEnergy(0.0);
  for(unsigned iCluster=0; iCluster < nClusters(); ++iCluster) {
    clusterEnergy  += efRecCluster(iCluster)->getCluster()->e();
  }
  return clusterEnergy;
}
 
void eflowCaloObject::simulateShower(const EventContext& ctx, eflowLayerIntegrator *integrator, const eflowEEtaBinnedParameters* binnedParameters,
const PFEnergyPredictorTool* energyP, bool useLegacyEnergyBinIndexing){
 
  for (auto *thisEfRecTrack : m_eflowRecTracks) {
 
    std::vector<eflowRecCluster*> matchedClusters;
    const std::vector<eflowTrackClusterLink*>& links = thisEfRecTrack->getClusterMatches();
    for (auto* itLink : links) {
      matchedClusters.push_back(itLink->getCluster());
    }
 
    double trackEM1eta = thisEfRecTrack->getTrackCaloPoints().getEM1eta();
    /* if a track is in the forward EM (2.5 < eta < 3.2) then there is no EM1 -> need to use EM2 */
    if(trackEM1eta<-998.) trackEM1eta = thisEfRecTrack->getTrackCaloPoints().getEM2eta();
    /* if a track is not in the EM region (3.2 < eta < 4.0) then should use FCAL0 */
    if(trackEM1eta<-998.) trackEM1eta = thisEfRecTrack->getTrackCaloPoints().getFCAL0eta();
 
    double trackE = thisEfRecTrack->getTrack()->e();
 
    if (!binnedParameters->binExists(trackE, trackEM1eta)) {
      thisEfRecTrack->setHasBin(false);
      return;
    }
 
    /* Determine the LFI */
    integrator->measureNewClus(ctx, matchedClusters, thisEfRecTrack);
    eflowFirstIntENUM j1st = integrator->getFirstIntLayer();
    
    /*Save j1st info */
    thisEfRecTrack->setLayerHED(j1st);
 
    /* Get parameters for j1st */
    eflowRingSubtractionManager& cellSubtractionManager = thisEfRecTrack->getCellSubtractionManager();
    cellSubtractionManager.getOrdering(binnedParameters, trackE, trackEM1eta, j1st,useLegacyEnergyBinIndexing);
 
    /* Set expected energy in the eflowRecTrack object */
    const double expectedEnergy = energyP ? energyP->nnEnergyPrediction(thisEfRecTrack) : cellSubtractionManager.fudgeMean() * thisEfRecTrack->getTrack()->e();     
    const double expectedEnergySigma = std::fabs(cellSubtractionManager.fudgeStdDev() * thisEfRecTrack->getTrack()->e());
 
    const std::vector<eflowTrackClusterLink*>* bestClusters_015 = thisEfRecTrack->getAlternativeClusterMatches("cone_015");
    const std::vector<eflowTrackClusterLink*>* bestClusters_02 = thisEfRecTrack->getAlternativeClusterMatches("cone_02");
 
    //First we calculate how much energy is found in a cone of 0.15
    float totalE_015 = 0.0;
    
    //This pointer can be a nullptr if no clusters were matched to a track in dR < 0.15
    if (bestClusters_015){
      for (eflowTrackClusterLink* thisLink : *bestClusters_015){
    eflowRecCluster* thisBestCluster = thisLink->getCluster();
    if (thisBestCluster){      
      const xAOD::CaloCluster* theCluster =  thisBestCluster->getCluster();
      if (theCluster) {
        if (theCluster->e()>0.0){
          totalE_015 += theCluster->e();
        }
      }
    }
      }
    }//if vector of 0.15 clusters exists
    
    double pull_015 = NAN;
    if (expectedEnergySigma > 1e-6 ) pull_015 = (totalE_015-expectedEnergy)/expectedEnergySigma;
    thisEfRecTrack->setpull15(pull_015);
 
    double trackPt = thisEfRecTrack->getTrack()->pt();
    //If the looked up expected energy deposit was 0.0, then pull_015 is NAN. In that case we should not try to apply the 2D cut described below.
    if (!std::isnan(pull_015)){
      //We use a 2D cut in the pull_015 and log10 of track pt plane to define a dense environment - if too dense then we disable the charged shower subtraction
      //The cut values are such that above a track pt of 40 GeV we are very agrressive about disabling the cell by cell charged shower subtraction.
      //The specific cut values were found by optimising the jet resolutions in the run 2 data taking environment.
      //Further details can be found in these slides from C. Young:
      //https://indico.cern.ch/event/396923/contributions/949333/attachments/795878/1090871/Presentation.pdf
      if (pull_015 > 0.0 + (log10(40000)-log10(trackPt))*33.2 && 0.0 != expectedEnergySigma && bestClusters_015 && bestClusters_02){
        thisEfRecTrack->setSubtracted(); //this tricks eflowRec into thinking this track was subtracted, and hence no further subtraction will be done
        thisEfRecTrack->setIsInDenseEnvironment();
        //recalculate the LHED and the ordering  and find the new  expected E + sigma of expected E (the new LHED can change the latter two values we find in the look up tables)
        //we use a larger cone of 0.2 for this
        std::vector<eflowRecCluster*> theBestEfRecClusters_02;
        for (eflowTrackClusterLink* thisLink : *bestClusters_02) if (thisLink->getCluster()->getCluster()->e() > 0.0) theBestEfRecClusters_02.push_back(thisLink->getCluster());
        integrator->measureNewClus(ctx, theBestEfRecClusters_02, thisEfRecTrack);
        j1st = integrator->getFirstIntLayer();
        cellSubtractionManager.getOrdering(binnedParameters, trackE, trackEM1eta, j1st,useLegacyEnergyBinIndexing);
        thisEfRecTrack->setEExpect(cellSubtractionManager.fudgeMean() * trackE, std::fabs(cellSubtractionManager.fudgeStdDev()*trackE)*std::fabs(cellSubtractionManager.fudgeStdDev()*trackE));
      }
      else {
        thisEfRecTrack->setEExpect(expectedEnergy, expectedEnergySigma*expectedEnergySigma);
      }//ok to do subtraction, and so we just set the usual expected E + sigma of expected E needed for subtraction 
    }
  }
}