CaloClusterMomentsMaker.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
//-----------------------------------------------------------------------
// File and Version Information:
//
// Description: see CaloClusterMomentsMaker.h
// 
// Environment:
//      Software developed for the ATLAS Detector at CERN LHC
//
// Author List:
//      Sven Menke
//      Peter Loch
//
//-----------------------------------------------------------------------
 
#include "CaloClusterMomentsMaker.h"
#include "CaloEvent/CaloCell.h"
#include "CaloEvent/CaloClusterContainer.h"
#include "CaloEvent/CaloCluster.h"
#include "CaloGeoHelpers/proxim.h"
#include "CaloEvent/CaloPrefetch.h"
#include "CaloInterface/ILArHVFraction.h"
#include "CaloGeoHelpers/CaloPhiRange.h"
#include "CaloIdentifier/CaloCell_ID.h"
#include "AthAllocators/ArenaPoolSTLAllocator.h"
 
#include "GeoPrimitives/GeoPrimitives.h"
#include "GeoPrimitives/GeoPrimitivesHelpers.h"
 
#include "CLHEP/Units/SystemOfUnits.h"
#include "CxxUtils/prefetch.h"
#include <Eigen/Dense>
#include <cmath>
#include <cstdint>
#include <iterator>
#include <limits>
#include <sstream>
 
#include <map>
#include <vector>
#include <tuple>
#include <string>
#include <cstdio>
#include <cmath>
 
using CLHEP::deg;
using CLHEP::cm;
using enum xAOD::CaloCluster::MomentType;
 
// Known moments
namespace {
  // name -> enum translator
  const std::map<std::string,xAOD::CaloCluster::MomentType> momentNameToEnumMap = {
    { "AVG_LAR_Q",         AVG_LAR_Q },
    { "AVG_TILE_Q",        AVG_TILE_Q },
    { "BADLARQ_FRAC",      BADLARQ_FRAC },
    { "BAD_CELLS_CORR_E",  BAD_CELLS_CORR_E },
    { "CELL_SIGNIFICANCE", CELL_SIGNIFICANCE },
    { "CELL_SIG_SAMPLING", CELL_SIG_SAMPLING },
    { "CENTER_LAMBDA",     CENTER_LAMBDA },
    { "CENTER_MAG",        CENTER_MAG },
    { "CENTER_X",          CENTER_X },
    { "CENTER_Y",          CENTER_Y },
    { "CENTER_Z",          CENTER_Z },
    { "DELTA_ALPHA",       DELTA_ALPHA },
    { "DELTA_PHI",         DELTA_PHI },
    { "DELTA_THETA",       DELTA_THETA },
    { "ENG_BAD_CELLS",     ENG_BAD_CELLS },
    { "ENG_BAD_HV_CELLS",  ENG_BAD_HV_CELLS },
    { "ENG_FRAC_CORE",     ENG_FRAC_CORE },
    { "ENG_FRAC_EM",       ENG_FRAC_EM },
    { "ENG_FRAC_MAX",      ENG_FRAC_MAX },
    { "ENG_POS",           ENG_POS },
    { "FIRST_ENG_DENS",    FIRST_ENG_DENS },
    { "FIRST_ETA",         FIRST_ETA },
    { "FIRST_PHI",         FIRST_PHI },
    { "ISOLATION",         ISOLATION },
    { "LATERAL",           LATERAL },
    { "LONGITUDINAL",      LONGITUDINAL },
    { "MASS",              MASS },
    { "N_BAD_CELLS",       N_BAD_CELLS },
    { "N_BAD_HV_CELLS",    N_BAD_HV_CELLS },
    { "N_BAD_CELLS_CORR",  N_BAD_CELLS_CORR },
    { "PTD",               PTD },
    { "SECOND_ENG_DENS",   SECOND_ENG_DENS },
    { "SECOND_LAMBDA",     SECOND_LAMBDA },
    { "SECOND_R",          SECOND_R },
    { "SECOND_TIME",       SECOND_TIME },
    { "SIGNIFICANCE",      SIGNIFICANCE },
    { "EM_PROBABILITY",    EM_PROBABILITY },
    { "NCELL_SAMPLING",    NCELL_SAMPLING }
  };
  // enum -> name translator
  const std::map<xAOD::CaloCluster::MomentType,std::string> momentEnumToNameMap = {
    { AVG_LAR_Q,          "AVG_LAR_Q"        },
    { AVG_TILE_Q,         "AVG_TILE_Q"       },
    { BADLARQ_FRAC,       "BADLARQ_FRAC"     },
    { BAD_CELLS_CORR_E,   "BAD_CELLS_CORR_E" },
    { CELL_SIGNIFICANCE,  "CELL_SIGNIFICANCE"},
    { CELL_SIG_SAMPLING,  "CELL_SIG_SAMPLING"},
    { CENTER_LAMBDA,      "CENTER_LAMBDA"    },
    { CENTER_MAG,         "CENTER_MAG"       },
    { CENTER_X,           "CENTER_X"         },
    { CENTER_Y,           "CENTER_Y"         },
    { CENTER_Z,           "CENTER_Z"         },
    { DELTA_ALPHA,        "DELTA_ALPHA"      },
    { DELTA_PHI,          "DELTA_PHI"        },
    { DELTA_THETA,        "DELTA_THETA"      },
    { ENG_BAD_CELLS,      "ENG_BAD_CELLS"    },
    { ENG_BAD_HV_CELLS,   "ENG_BAD_HV_CELLS" },
    { ENG_FRAC_CORE,      "ENG_FRAC_CORE"    },
    { ENG_FRAC_EM,        "ENG_FRAC_EM"      },
    { ENG_FRAC_MAX,       "ENG_FRAC_MAX"     },
    { ENG_POS,            "ENG_POS"          },
    { FIRST_ENG_DENS,     "FIRST_ENG_DENS"   },
    { FIRST_ETA,          "FIRST_ETA"        },
    { FIRST_PHI,          "FIRST_PHI"        },
    { ISOLATION,          "ISOLATION"        },
    { LATERAL,            "LATERAL"          },
    { LONGITUDINAL,       "LONGITUDINAL"     },
    { MASS,               "MASS"             },
    { N_BAD_CELLS,        "N_BAD_CELLS"      },
    { N_BAD_HV_CELLS,     "N_BAD_HV_CELLS"   },
    { N_BAD_CELLS_CORR,   "N_BAD_CELLS_CORR" },
    { PTD,                "PTD"              },
    { SECOND_ENG_DENS,    "SECOND_ENG_DENS"  },
    { SECOND_LAMBDA,      "SECOND_LAMBDA"    },
    { SECOND_R,           "SECOND_R"         },
    { SECOND_TIME,        "SECOND_TIME"      },
    { SIGNIFICANCE,       "SIGNIFICANCE"     },
    { EM_PROBABILITY,     "EM_PROBABILITY"   },
    { NCELL_SAMPLING,     "NCELL_SAMPLING"   }
  };
}
 
//###############################################################################
 
CaloClusterMomentsMaker::CaloClusterMomentsMaker(const std::string& type, 
                         const std::string& name,
                         const IInterface* parent)
  : AthAlgTool(type, name, parent),
    m_calo_id(nullptr),
    m_maxAxisAngle(20*deg), 
    m_minRLateral(4*cm), 
    m_minLLongitudinal(10*cm),
    m_minBadLArQuality(4000),
    m_calculateSignificance(false),
    m_calculateIsolation(false),
    m_calculateLArHVFraction(false),
    m_twoGaussianNoise(false),
    m_caloDepthTool("CaloDepthTool",this),
    m_larHVFraction("LArHVFraction",this),
    m_absOpt(false) 
{
  declareInterface<CaloClusterCollectionProcessor> (this);
  // Name(s) of Moments to calculate
  declareProperty("MomentsNames",m_momentsNames);
 
  // Maximum allowed angle between shower axis and the vector pointing
  // to the shower center from the IP in degrees. This property is needed
  // to protect against cases where all significant cells are in one sampling
  // and the shower axis can thus not be defined.
  declareProperty("MaxAxisAngle",m_maxAxisAngle);
  declareProperty("MinRLateral",m_minRLateral);
  declareProperty("MinLLongitudinal",m_minLLongitudinal);
  declareProperty("MinBadLArQuality",m_minBadLArQuality);
  // Use 2-gaussian noise for Tile
  declareProperty("TwoGaussianNoise",m_twoGaussianNoise);
  declareProperty("LArHVFraction",m_larHVFraction,"Tool Handle for LArHVFraction");
  // Not used anymore (with xAOD), but required when configured from  COOL.
  declareProperty("AODMomentsNames",m_momentsNamesAOD);
  // Use weighting of neg. clusters option?
  declareProperty("WeightingOfNegClusters", m_absOpt);
  // Set eta boundary for transition from outer to inner wheel in EME2
  declareProperty("EMECAbsEtaWheelTransition",m_etaInnerWheel);
}
 
//###############################################################################
 
StatusCode CaloClusterMomentsMaker::initialize()
{
  xAOD::CaloCluster dummyCluster;
 
  // loop list of requested moments
  std::string::size_type nstr(0); int nmom(0);
  for (const auto& mom : m_momentsNames) {
    ATH_MSG_DEBUG("Moment " << mom << " requested");
    // check if moment is known (enumerator available)
    auto fmap(momentNameToEnumMap.find(mom));
    if (fmap != momentNameToEnumMap.end()) {
      // valid moment found
      nstr = std::max(nstr, mom.length());
      ++nmom;
      if (fmap->second == SECOND_TIME) {
        // special flag for second moment of cell times - this moment is not
        // calculated in this tool! Do not add to internal (!) valid moments
        // list. Its value is available from xAOD::CaloCluster::secondTime()!
        m_secondTime = true;
 
        // Make sure the variable used for the moment is declared
        // to the auxiliary variable registry.  Otherwise, if we don't
        // set the moment for the first event (perhaps because there
        // are no clusters), then we can get warnings from AuxSelection.
        (void)dummyCluster.getMomentValue (fmap->second);
      } else if (fmap->second == NCELL_SAMPLING) {
        // flag indicates if number of cells in a sampling should be counted.
        // This is a vector of integers counts that is filled in this tool but
        // does not need any post-processing (e.g. normalization). It is not
        // added to the valid moments list for this reason.
        ATH_MSG_DEBUG("moment " << fmap->first << " found");
        m_nCellsPerSampling = true;
        xAOD::CaloCluster::ncells_store_t cellsdum;
 
        // Make sure the variable used for the moment is declared
        // to the auxiliary variable registry.
        (void)dummyCluster.retrieveMoment (fmap->second, cellsdum);
      } else if (fmap->second == EM_PROBABILITY) {
        ATH_MSG_WARNING(mom
                        << " not calculated in this tool - misconfiguration?");
      } else {
        // Make sure the variable used for the moment is declared
        // to the auxiliary variable registry.
        (void)dummyCluster.getMomentValue (fmap->second);
 
        // all other valid moments
        m_validMoments.push_back(fmap->second);
        // flag some special requests
        switch (fmap->second) {
          case SIGNIFICANCE:
          case CELL_SIGNIFICANCE:
            m_calculateSignificance = true;
            break;
          case ISOLATION:
            m_calculateIsolation = true;
            break;
          case ENG_BAD_HV_CELLS:
            m_calculateLArHVFraction = true;
            break;
          default:
            break;
        }  // set special processing flags
      }    // moment calculated with this tool
    } else {
      ATH_MSG_ERROR("Moment name " << mom << " not known; known moments are:");
      char buffer[128];
      std::string::size_type lstr(nstr);
      // determine field size
      for (const auto& fmom : momentNameToEnumMap) {
        lstr = std::max(lstr, fmom.first.length());
      }
      // print available moments
      for (const auto& fmom : momentNameToEnumMap) {
        sprintf(buffer, "moment name: %-*.*s - enumerator: %i", (int)lstr,
                (int)lstr, fmom.first.c_str(), (int)fmom.second);
        ATH_MSG_ERROR(buffer);
      }
      auto fmom(momentNameToEnumMap.find("SECOND_TIME"));
      sprintf(buffer, "moment name: %-*.*s - enumerator: %i", (int)nstr,
              (int)nstr, fmom->first.c_str(), (int)fmom->second);
      ATH_MSG_ERROR(buffer);
      fmom = momentNameToEnumMap.find("NCELL_SAMPLING");
      sprintf(buffer, "moment name: %-*.*s - enumerator: %i", (int)nstr,
              (int)nstr, fmom->first.c_str(), (int)fmom->second);
      ATH_MSG_ERROR(buffer);
      return StatusCode::FAILURE;
    }  // found unknown moment name
  }    // loop configured moment names
 
  // sort and remove duplicates
  std::sort(m_validMoments.begin(), m_validMoments.end());
  m_validMoments.erase(
      std::unique(m_validMoments.begin(), m_validMoments.end()),
      m_validMoments.end());
 
  // print configured moments
  ATH_MSG_INFO("Construct and save " << nmom << " cluster moments: ");
  char buffer[128];
  for (auto menum : m_validMoments) {
    sprintf(buffer, "moment name: %-*.*s - enumerator: %i", (int)nstr,
            (int)nstr, momentEnumToNameMap.at(menum).c_str(), (int)menum);
    ATH_MSG_INFO(buffer);
  }
  if (m_secondTime) {
    auto fmom(momentNameToEnumMap.find("SECOND_TIME"));
    sprintf(buffer, "moment name: %-*.*s - enumerator: %i (save only)",
            (int)nstr, (int)nstr, fmom->first.c_str(), (int)fmom->second);
    ATH_MSG_INFO(buffer);
  }
  if (m_nCellsPerSampling) {
    auto fmom(momentNameToEnumMap.find("NCELL_SAMPLING"));
    sprintf(buffer, "moment name: %-*.*s - enumerator: %i", (int)nstr,
            (int)nstr, fmom->first.c_str(), (int)fmom->second);
    ATH_MSG_INFO(buffer);
  }
 
  // retrieve CaloCell ID server
  CHECK(detStore()->retrieve(m_calo_id,"CaloCell_ID"));
  
  // retrieve the calo depth tool
  CHECK(m_caloDepthTool.retrieve());
  ATH_CHECK(m_caloMgrKey.initialize());
 
  // retrieve specific servers and tools for selected processes
  ATH_CHECK(m_noiseCDOKey.initialize(m_calculateSignificance));
  if (m_calculateLArHVFraction) { ATH_CHECK(m_larHVFraction.retrieve()); } else { m_larHVFraction.disable(); }
 
  return StatusCode::SUCCESS;
}
 
StatusCode CaloClusterMomentsMaker::finalize()
{
  return StatusCode::SUCCESS;
}
 
//#############################################################################
 
namespace CaloClusterMomentsMaker_detail {
 
 
struct cellinfo {
  double x;
  double y;
  double z;
  double energy;
  double eta;
  double phi;
  double r;
  double lambda;
  double volume;
  CaloCell_ID::CaloSample sample;
  unsigned int identifier;
};
 
} // namespace CaloClusterMomentsMaker_detail
 
StatusCode
CaloClusterMomentsMaker::execute(const EventContext& ctx,
                                 xAOD::CaloClusterContainer *theClusColl)
  const
{ 
  ATH_MSG_DEBUG("Executing " << name());
 
  // Maps cell IdentifierHash to cluster index in cluster collection.
  // Only used when cluster isolation moment is calculated.
  using clusterIdx_t = std::uint16_t;
  typedef std::pair<clusterIdx_t, clusterIdx_t> clusterPair_t;
  std::vector<clusterPair_t> clusterIdx;
  const clusterIdx_t noCluster = std::numeric_limits<clusterIdx_t>::max();
 
  const CaloNoise* noise=nullptr;
  if (m_calculateSignificance) {
    SG::ReadCondHandle<CaloNoise> noiseHdl{m_noiseCDOKey,ctx};
    noise=*noiseHdl;
  }
 
  SG::ReadCondHandle<CaloDetDescrManager> caloMgrHandle{ m_caloMgrKey, ctx };
  const CaloDetDescrManager* caloDDMgr = *caloMgrHandle;
  // Counters for number of empty and non-empty neighbor cells per sampling
  // layer Only used when cluster isolation moment is calculated.
  int nbEmpty[CaloCell_ID::Unknown];
  int nbNonEmpty[CaloCell_ID::Unknown];
 
  // prepare stuff from entire collection in case isolation moment
  // should be calculated
 
  if ( m_calculateIsolation ) {
 
    if (theClusColl->size() >= noCluster) {
      msg(MSG::ERROR) << "Too many clusters" << endmsg;
      return StatusCode::FAILURE;
    }
 
    // initialize with "empty" values
    clusterIdx.resize(m_calo_id->calo_cell_hash_max(),
                      clusterPair_t(noCluster, noCluster));
 
    int iClus = 0;
    for (xAOD::CaloCluster* theCluster : *theClusColl) {
      // loop over all cell members and fill cell vector for used cells
      xAOD::CaloCluster::cell_iterator cellIter    = theCluster->cell_begin();
      xAOD::CaloCluster::cell_iterator cellIterEnd = theCluster->cell_end();
      for(; cellIter != cellIterEnd; cellIter++ ){
        CxxUtils::prefetchNext(cellIter, cellIterEnd);
        const CaloCell* pCell = *cellIter;
 
    Identifier myId = pCell->ID();
    IdentifierHash myHashId = m_calo_id->calo_cell_hash(myId); 
    if ( clusterIdx[(unsigned int)myHashId].first != noCluster) {
      // check weight and assign to current cluster if weight is > 0.5
      double weight = cellIter.weight();
      if ( weight > 0.5 )
        clusterIdx[(unsigned int)myHashId].first = iClus;
    }
    else {
      clusterIdx[(unsigned int)myHashId].first = iClus;
    }
      }
      ++iClus;
    }
  }
 
  // Move allocation of temporary arrays outside the cluster loop.
  // That way, we don't need to delete and reallocate them
  // each time through the loop.
 
  std::vector<CaloClusterMomentsMaker_detail::cellinfo> cellinfo;
  std::vector<double> maxSampE (CaloCell_ID::Unknown);
  std::vector<double> myMoments(m_validMoments.size(),0);
  std::vector<double> myNorms(m_validMoments.size(),0);
  std::vector<std::tuple<int,int> > nCellsSamp; nCellsSamp.reserve(CaloCell_ID::Unknown);
  std::vector<IdentifierHash> theNeighbors;
  // loop over individual clusters
  xAOD::CaloClusterContainer::iterator clusIter = theClusColl->begin();
  xAOD::CaloClusterContainer::iterator clusIterEnd = theClusColl->end();
  int iClus = 0;
  for( ;clusIter!=clusIterEnd;++clusIter,++iClus) {
    xAOD::CaloCluster * theCluster = *clusIter;
 
    double w(0),xc(0),yc(0),zc(0),mx(0),my(0),mz(0),mass(0);
    double eBad(0),ebad_dac(0),ePos(0),eBadLArQ(0),sumSig2(0),maxAbsSig(0);
    double eLAr2(0),eLAr2Q(0);
    double eTile2(0),eTile2Q(0);
    double eBadLArHV(0);
    int nbad(0),nbad_dac(0),nBadLArHV(0);
    unsigned int i,nSigSampl(0);
    unsigned int theNumOfCells = theCluster->size();
    
    // these two are needed for the LATERAL moment
    int iCellMax(-1);
    int iCellScndMax(-1);
 
    cellinfo.clear();
    if (cellinfo.capacity() == 0)
      cellinfo.reserve (theNumOfCells*2);
    
    for(i=0;i<(unsigned int)CaloCell_ID::Unknown;i++) 
      maxSampE[i] = 0;
    
    if ( !m_momentsNames.empty() ) {
      std::fill (myMoments.begin(), myMoments.end(), 0);
      std::fill (myNorms.begin(),   myNorms.end(),   0);
      if ( m_calculateIsolation ) {
        std::fill_n(nbNonEmpty, CaloCell_ID::Unknown, 0);
        std::fill_n(nbEmpty, CaloCell_ID::Unknown, 0);
      }
      
      // loop over all cell members and calculate the center of mass
      xAOD::CaloCluster::cell_iterator cellIter    = theCluster->cell_begin();
      xAOD::CaloCluster::cell_iterator cellIterEnd = theCluster->cell_end();
      for(; cellIter != cellIterEnd; cellIter++ ){
        CaloPrefetch::nextDDE(cellIter, cellIterEnd);
 
        const CaloCell* pCell = (*cellIter);
    Identifier myId = pCell->ID();
    const CaloDetDescrElement* myCDDE = pCell->caloDDE();
    double ene = pCell->e();
        if(m_absOpt) ene = std::abs(ene);  
    double weight = cellIter.weight();//theCluster->getCellWeight(cellIter);
    if ( pCell->badcell() ) {
      eBad += ene*weight;
      nbad++;
      if(ene!=0){
        ebad_dac+=ene*weight;
        nbad_dac++;
      }
    }
    else {
      if ( myCDDE && ! (myCDDE->is_tile()) 
           && ((pCell->provenance() & 0x2000) == 0x2000) 
           && !((pCell->provenance() & 0x0800) == 0x0800)) {
        if ( pCell->quality() > m_minBadLArQuality ) {
          eBadLArQ += ene*weight;
        }
        eLAr2  += ene*weight*ene*weight;
        eLAr2Q += ene*weight*ene*weight*pCell->quality();
      }
      if ( myCDDE && myCDDE->is_tile() ) {
        uint16_t tq = pCell->quality();
        uint8_t tq1 = (0xFF00&tq)>>8; // quality in channel 1
        uint8_t tq2 = (0xFF&tq); // quality in channel 2
        // reject cells with either 0xFF00 or 0xFF
        if ( ((tq1&0xFF) != 0xFF) && ((tq2&0xFF) != 0xFF) ) {    
          eTile2  += ene*weight*ene*weight;
          // take the worse of both qualities (one might be 0 in
          // 1-channel cases)
          eTile2Q += ene*weight*ene*weight*(tq1>tq2?tq1:tq2);
        }
      } 
    }
    if ( ene > 0 ) {
      ePos += ene*weight;
    }
      
    if ( m_calculateSignificance ) {
      const float sigma = m_twoGaussianNoise ?\
        noise->getEffectiveSigma(pCell->ID(),pCell->gain(),pCell->energy()) : \
        noise->getNoise(pCell->ID(),pCell->gain());
 
      sumSig2 += sigma*sigma;
      // use geometry weighted energy of cell for leading cell significance
      double Sig = (sigma>0?ene*weight/sigma:0);
      if (m_useGPUCriteria) {
        unsigned int thisSampl = myCDDE->getSampling();
        if ( ( std::abs(Sig) > std::abs(maxAbsSig) )                                                 ||
         ( std::abs(Sig) == std::abs(maxAbsSig) && thisSampl > nSigSampl )                       ||
         ( std::abs(Sig) == std::abs(maxAbsSig) && thisSampl == nSigSampl && Sig > maxAbsSig )      ) {
          maxAbsSig = Sig;
          nSigSampl = thisSampl;
        }
 
      }
      else {
        if ( std::abs(Sig) > std::abs(maxAbsSig) ) {
          maxAbsSig = Sig;
          nSigSampl = myCDDE->getSampling();
        }
      }
    }
    if ( m_calculateIsolation ) {
      // get all 2D Neighbours if the cell is not inside another cluster with
      // larger weight
 
      IdentifierHash myHashId = m_calo_id->calo_cell_hash(myId);
      if ( clusterIdx[myHashId].first == iClus ) {
            theNeighbors.clear();
        m_calo_id->get_neighbours(myHashId, LArNeighbours::all2D, theNeighbors);
        for (const auto& nhash: theNeighbors) {
              clusterPair_t& idx = clusterIdx[nhash];
 
          // only need to look at each cell once per cluster
          if ( idx.second == iClus ) continue;
          idx.second = iClus;
 
          if ( idx.first == noCluster ) {
            ++ nbEmpty[m_calo_id->calo_sample(nhash)];
          } else if ( idx.first != iClus ) {
                ++ nbNonEmpty[m_calo_id->calo_sample(nhash)];
          }
 
        }
      }
    }
 
    if ( myCDDE != nullptr ) { 
      if ( m_nCellsPerSampling ) { 
        CaloCell_ID::CaloSample sam = myCDDE->getSampling();
        size_t idx((size_t)sam);
        if ( idx >= nCellsSamp.size() ) { nCellsSamp.resize(idx+1, { 0, 0 } ); }
        std::get<0>(nCellsSamp[idx])++;
        // special count for inner wheel cells in EME2
        if ( sam == CaloCell_ID::EME2 && std::abs(myCDDE->eta()) > m_etaInnerWheel ) { std::get<1>(nCellsSamp[idx])++; }
      }
      if ( ene > 0. && weight > 0) {
        // get all geometric information needed ...
            cellinfo.push_back (CaloClusterMomentsMaker_detail::cellinfo {
                .x = myCDDE->x(),
                .y = myCDDE->y(),
                .z = myCDDE->z(),
                .energy = ene*weight,
                .eta = myCDDE->eta(),
                .phi = myCDDE->phi(),
                .r = 0,       // These two are filled in later.
                .lambda = 0,
                .volume = myCDDE->volume(),
                .sample = myCDDE->getSampling(),
                .identifier = cellIter.index()
                //Using the index instead of the hash ID as disambiguation criterion
                //is relevant for the GPU now that we no longer assume the two are the same,
                //and this gives us better performance.
              });
 
        CaloClusterMomentsMaker_detail::cellinfo& ci = cellinfo.back();
 
        if ( ci.energy > maxSampE[(unsigned int)ci.sample] )
          maxSampE[(unsigned int)ci.sample] = ci.energy;
 
        if (m_useGPUCriteria) {
          if (iCellMax < 0                                                                              ||
          ci.energy > cellinfo[iCellMax].energy                                                     ||
          (ci.energy == cellinfo[iCellMax].energy && ci.identifier > cellinfo[iCellMax].identifier)    ) {
        iCellScndMax = iCellMax;
        iCellMax = cellinfo.size()-1;
          }
          else if (iCellScndMax < 0                                                                                  ||
               ci.energy > cellinfo[iCellScndMax].energy                                                         ||
               (ci.energy == cellinfo[iCellScndMax].energy && ci.identifier > cellinfo[iCellScndMax].identifier)    )
        {
          iCellScndMax = cellinfo.size()-1;
        }
        }
        else {
          if (iCellMax < 0 || ci.energy > cellinfo[iCellMax].energy ) {
        iCellScndMax = iCellMax;
        iCellMax = cellinfo.size()-1;
          }
          else if (iCellScndMax < 0 ||
               ci.energy > cellinfo[iCellScndMax].energy )
        {
          iCellScndMax = cellinfo.size()-1;
        }
        }
      
        xc += ci.energy*ci.x;
        yc += ci.energy*ci.y;
        zc += ci.energy*ci.z;
 
        double dir = ci.x*ci.x+ci.y*ci.y+ci.z*ci.z;
        
        if ( dir > 0) {
          dir = sqrt(dir);
          dir = 1./dir;
        }
        mx += ci.energy*ci.x*dir;
        my += ci.energy*ci.y*dir;
        mz += ci.energy*ci.z*dir;
        
        w  += ci.energy;
      } // cell has E>0 and weight != 0
    } // cell has valid DDE
      } //end of loop over all cells
      if (m_calculateLArHVFraction) {
    const auto hvFrac=m_larHVFraction->getLArHVFrac(theCluster->getCellLinks(),ctx);
    eBadLArHV= hvFrac.first;
    nBadLArHV=hvFrac.second;
      }
 
      if ( w > 0 || (m_useGPUCriteria && w >= 0) ) {
    mass = w*w - mx*mx - my*my - mz*mz;
    if ( mass > 0) {
      mass = sqrt(mass);
    }
    else {
      // make mass negative if m^2 was negative
      mass = -sqrt(-mass);
    }
 
  if (w == 0) {
      w = 1.0;
  }
 
    xc/=w;
    yc/=w;
    zc/=w;
    Amg::Vector3D showerCenter(xc,yc,zc);
    w=0;
    
 
    //log << MSG::WARNING << "Found bad cells " <<  xbad_dac << " " << ybad_dac << " " << zbad_dac << " " << ebad_dac <<  endmsg;
    //log << MSG::WARNING << "Found Cluster   " <<  xbad_dac << " " << ybad_dac << " " << zbad_dac << " " <<  endmsg;
    // shower axis is just the vector pointing from the IP to the shower center
    // in case there are less than 3 cells in the cluster
    
    Amg::Vector3D showerAxis(xc,yc,zc);
    Amg::setMag(showerAxis,1.0);
 
    // otherwise the principal direction with the largest absolute 
    // eigenvalue will be used unless it's angle w.r.t. the vector pointing
    // from the IP to the shower center is larger than allowed by the 
    // property m_maxAxisAngle
 
    double angle(0),deltaPhi(0),deltaTheta(0);
    if ( cellinfo.size() > 2 ) {
      Eigen::Matrix3d C=Eigen::Matrix3d::Zero();
      for(const CaloClusterMomentsMaker_detail::cellinfo& ci : cellinfo) {
            const double e2 = ci.energy * ci.energy;
            
        C(0,0) += e2*(ci.x-xc)*(ci.x-xc);
        C(1,0) += e2*(ci.x-xc)*(ci.y-yc);
        C(2,0) += e2*(ci.x-xc)*(ci.z-zc);
        
        C(1,1) += e2*(ci.y-yc)*(ci.y-yc);
        C(2,1) += e2*(ci.y-yc)*(ci.z-zc);
        
        C(2,2) += e2*(ci.z-zc)*(ci.z-zc);
        w += e2;
      } 
      C/=(w != 0 ? w : 1.0);
      
      Eigen::SelfAdjointEigenSolver<Eigen::Matrix3d> eigensolver(C);
      if (eigensolver.info() != Eigen::Success) {
        msg(MSG::WARNING) << "Failed to compute Eigenvalues -> Can't determine shower axis" << endmsg;
      }
      else {
        // don't use the principal axes if at least one of the 3 
        // diagonal elements is 0
 
        const Eigen::Vector3d& S=eigensolver.eigenvalues(); 
        const Eigen::Matrix3d& U=eigensolver.eigenvectors();
 
            const double epsilon = 1.E-6;
 
        if ( std::abs(S[0]) >= epsilon && std::abs(S[1]) >= epsilon && std::abs(S[2]) >= epsilon ) { 
        
          Amg::Vector3D prAxis(showerAxis);
          int iEigen = -1;
        
          for (i=0;i<3;i++) {
        Amg::Vector3D tmpAxis=U.col(i);
 
        // calculate the angle      
        double tmpAngle=Amg::angle(tmpAxis,showerAxis);
        
        if ( tmpAngle > 90*deg ) { 
          tmpAngle = 180*deg - tmpAngle;
          tmpAxis = -tmpAxis;
        }
        
        if ( iEigen == -1 || tmpAngle < angle ) {
          iEigen = i;
          angle = tmpAngle;
          prAxis = tmpAxis;
        }
          }//end for loop     
        
          // calculate theta and phi angle differences
          
          deltaPhi = CaloPhiRange::diff(showerAxis.phi(),prAxis.phi());
        
          deltaTheta = showerAxis.theta() - prAxis.theta();
        
          // check the angle
        
          if ( angle < m_maxAxisAngle ) {
        showerAxis = prAxis;
          }
          else 
        ATH_MSG_DEBUG("principal Direction (" << prAxis[Amg::x] << ", " 
                  << prAxis[Amg::y] << ", " << prAxis[Amg::z] << ") deviates more than " 
                  << m_maxAxisAngle*(1./deg) 
                  << " deg from IP-to-ClusterCenter-axis (" << showerAxis[Amg::x] << ", "
                  << showerAxis[Amg::y] << ", " << showerAxis[Amg::z] << ")");
        }//end if std::abs(S)<epsilon
        else {
          ATH_MSG_DEBUG("Eigenvalues close to 0, do not use principal axis");
        }
      }//end got eigenvalues
    } //end if cellinfo.size()>2
      
    ATH_MSG_DEBUG("Shower Axis = (" << showerAxis[Amg::x] << ", "
              << showerAxis[Amg::y] << ", " << showerAxis[Amg::z] << ")");
    
 
    // calculate radial distance from and the longitudinal distance
    // along the shower axis for each cell. The cluster center is 
    // at r=0 and lambda=0
    
    for (auto& ci : cellinfo) {
      const Amg::Vector3D currentCell(ci.x,ci.y,ci.z);
      // calculate distance from shower axis r
      ci.r = ((currentCell-showerCenter).cross(showerAxis)).mag();
      // calculate distance from shower center along shower axis
      ci.lambda = (currentCell-showerCenter).dot(showerAxis);
    }  
    
    // loop over all positive energy cells and calculate all desired moments
    
    // define common norm for all simple moments
    double commonNorm = 0;
        double phi0 = cellinfo.size() > 0 ? cellinfo[0].phi : 0;
 
    for(unsigned i=0;i<cellinfo.size();i++) {
      const CaloClusterMomentsMaker_detail::cellinfo& ci = cellinfo[i];
      // loop over all valid moments
      commonNorm += ci.energy;
      for(size_t iMoment = 0, size = m_validMoments.size();
              iMoment != size;
              ++ iMoment)
          {
        // now calculate the actual moments
        switch (m_validMoments[iMoment]) {
        case FIRST_ETA:
          myMoments[iMoment] += ci.energy*ci.eta;
          break;
        case FIRST_PHI:
          // first cell decides the sign in order to avoid
          // overlap problem at phi = -pi == +pi
          // need to be normalized to the range [-pi,+pi] in the end
              myMoments[iMoment] += ci.energy * proxim (ci.phi, phi0);
          break;
        case SECOND_R:
          myMoments[iMoment] += ci.energy*ci.r*ci.r;
          break;
        case SECOND_LAMBDA:
          myMoments[iMoment] += ci.energy*ci.lambda*ci.lambda;
          break;
        case LATERAL:
          if ( (int)i != iCellMax && (int)i != iCellScndMax ) {
        myMoments[iMoment] += ci.energy*ci.r*ci.r;
        myNorms[iMoment] += ci.energy*ci.r*ci.r;
          }
          else {
        double rm = ci.r;
        if ( rm < m_minRLateral ) 
          rm = m_minRLateral;
        myNorms[iMoment] += rm*rm*ci.energy;
          }
          break;
        case LONGITUDINAL:
          if ( (int)i != iCellMax && (int)i != iCellScndMax ) {
        myMoments[iMoment] += ci.energy*ci.lambda*ci.lambda;
        myNorms[iMoment] += ci.energy*ci.lambda*ci.lambda;
          }
          else {
        double lm = ci.lambda;
        if ( lm < m_minLLongitudinal ) 
          lm = m_minLLongitudinal;
        myNorms[iMoment] += lm*lm*ci.energy;
          }
          break;
        case FIRST_ENG_DENS:
          if ( ci.volume > 0 ) {
        myMoments[iMoment] += ci.energy*ci.energy/ci.volume;
        myNorms[iMoment] += ci.energy;
          }
          break;
        case SECOND_ENG_DENS:
          if ( ci.volume > 0 ) {
        myMoments[iMoment] += ci.energy*std::pow(ci.energy/ci.volume,2);
        myNorms[iMoment] += ci.energy;
          }
          break;
        case ENG_FRAC_EM:
          if ( ci.sample == CaloCell_ID::EMB1 
           || ci.sample == CaloCell_ID::EMB2 
           || ci.sample == CaloCell_ID::EMB3 
           || ci.sample == CaloCell_ID::EME1
           || ci.sample == CaloCell_ID::EME2
           || ci.sample == CaloCell_ID::EME3
           || ci.sample == CaloCell_ID::FCAL0 )
        myMoments[iMoment] += ci.energy;
          break;
        case ENG_FRAC_MAX:
          if ( (int)i == iCellMax ) 
        myMoments[iMoment] = ci.energy;
          break;
        case PTD:
          // do not convert to pT since clusters are small and
          // there is virtually no difference and cosh just costs
          // time ...
          myMoments[iMoment] += ci.energy*ci.energy;
          myNorms[iMoment] += ci.energy;
          break;
        default:
          // nothing to be done for other moments
          break;
        }
      }
    } //end of loop over cell
      
    
    // assign moments which don't need the loop over the cells
        for (size_t iMoment = 0, size = m_validMoments.size();
             iMoment != size;
             ++ iMoment)
        {
      // now calculate the actual moments
          switch (m_validMoments[iMoment]) {
      case FIRST_ETA:
      case FIRST_PHI:
      case SECOND_R:
      case SECOND_LAMBDA:
      case ENG_FRAC_EM:
      case ENG_FRAC_MAX:
        myNorms[iMoment] = commonNorm;
        break;
      case DELTA_PHI:
        myMoments[iMoment] = deltaPhi;
        break;
      case DELTA_THETA:
        myMoments[iMoment] = deltaTheta;
        break;
      case DELTA_ALPHA:
        myMoments[iMoment] = angle;
        break;
      case CENTER_X:
        myMoments[iMoment] = showerCenter.x();
        break;
      case CENTER_Y:
        myMoments[iMoment] = showerCenter.y();
        break;
      case CENTER_Z:
        myMoments[iMoment] = showerCenter.z();
        break;
      case CENTER_MAG:
        myMoments[iMoment] = showerCenter.mag();
        break;
      case CENTER_LAMBDA:
        // calculate the longitudinal distance along the shower axis
        // of the shower center from the calorimeter start
        
        // first need calo boundary at given eta phi try LAREM barrel
        // first, then LAREM endcap OW, then LAREM endcap IW, then
        // FCal
        {
          double r_calo(0),z_calo(0),lambda_c(0); 
          r_calo = m_caloDepthTool->get_entrance_radius(CaloCell_ID::EMB1,
                                showerCenter.eta(),
                                showerCenter.phi(),
                  caloDDMgr);
          if ( r_calo == 0 ) {
        z_calo = m_caloDepthTool->get_entrance_z(CaloCell_ID::EME1,
                             showerCenter.eta(),
                             showerCenter.phi(),
               caloDDMgr);
        if ( z_calo == 0 ) 
          z_calo = m_caloDepthTool->get_entrance_z(CaloCell_ID::EME2,
                               showerCenter.eta(),
                               showerCenter.phi(),
                 caloDDMgr);
        if ( z_calo == 0 ) 
          z_calo = m_caloDepthTool->get_entrance_z(CaloCell_ID::FCAL0,
                               showerCenter.eta(),
                               showerCenter.phi(),
                 caloDDMgr);
        if ( z_calo == 0 ) // for H6 TB without EMEC outer wheel 
          z_calo = m_caloDepthTool->get_entrance_z(CaloCell_ID::HEC0,
                               showerCenter.eta(),
                               showerCenter.phi(),
                 caloDDMgr);
        if ( z_calo != 0 && showerAxis.z() != 0 ) {
          lambda_c = std::abs((z_calo-showerCenter.z())/showerAxis.z());
        }
          }
          else {
        double r_s2 = showerAxis.x()*showerAxis.x()
          +showerAxis.y()*showerAxis.y();
        double r_cs = showerAxis.x()*showerCenter.x()
          +showerAxis.y()*showerCenter.y();
        double r_cr = showerCenter.x()*showerCenter.x()
          +showerCenter.y()*showerCenter.y()-r_calo*r_calo;
        if ( r_s2 > 0 ) {
          double det = r_cs*r_cs/(r_s2*r_s2) - r_cr/r_s2;
          if ( det > 0 ) {
            det = sqrt(det);
            double l1(-r_cs/r_s2);
            double l2(l1);
            l1 += det;
            l2 -= det;
            if ( std::abs(l1) < std::abs(l2) ) 
              lambda_c = std::abs(l1);
            else
              lambda_c = std::abs(l2);
          }
        }
          }
          myMoments[iMoment] = lambda_c;
        }
        break;
      case ENG_FRAC_CORE:
        for(i=0;i<(int)CaloCell_ID::Unknown;i++) 
          myMoments[iMoment] += maxSampE[i];
        myNorms[iMoment] = commonNorm;
        break;
      case ISOLATION:
        {
          // loop over empty and filled perimeter cells and
          // get a weighted ratio by means of energy fraction per layer
          for(unsigned int i=0; i != CaloSampling::Unknown; ++ i) {
        const xAOD::CaloCluster::CaloSample s=( xAOD::CaloCluster::CaloSample)(i);
        if (theCluster->hasSampling(s)) {
          const double eSample = theCluster->eSample(s);
          if (eSample > 0) {
            int nAll = nbEmpty[i]+nbNonEmpty[i];
            if (nAll > 0) {
              myMoments[iMoment] += (eSample*nbEmpty[i])/nAll;
              myNorms[iMoment] += eSample;
            }
          }//end of eSample>0
        }//end has sampling
          }//end loop over samplings
        }
        break;
      case ENG_BAD_CELLS:
        myMoments[iMoment] = eBad;
        break;
      case N_BAD_CELLS:
        myMoments[iMoment] = nbad;
            break;
          case N_BAD_CELLS_CORR:
            myMoments[iMoment] = nbad_dac;
            break;
      case BAD_CELLS_CORR_E:
        myMoments[iMoment] = ebad_dac;
            break;
      case BADLARQ_FRAC:
        myMoments[iMoment] = eBadLArQ/(theCluster->e()!=0.?theCluster->e():1.);
            break;
      case ENG_POS:
        myMoments[iMoment] = ePos;
            break;
      case SIGNIFICANCE:
        myMoments[iMoment] = (sumSig2>0?theCluster->e()/sqrt(sumSig2):0.);
            break;
      case CELL_SIGNIFICANCE:
        myMoments[iMoment] = maxAbsSig;
            break;
      case CELL_SIG_SAMPLING:
        myMoments[iMoment] = nSigSampl;
            break;
      case AVG_LAR_Q:
        myMoments[iMoment] = eLAr2Q/(eLAr2>0?eLAr2:1);
            break;
      case AVG_TILE_Q:
        myMoments[iMoment] = eTile2Q/(eTile2>0?eTile2:1);
            break;
      case ENG_BAD_HV_CELLS:
        myMoments[iMoment] = eBadLArHV;
        break;
      case N_BAD_HV_CELLS:
        myMoments[iMoment] = nBadLArHV;
            break;
      case PTD:
        myMoments[iMoment] = sqrt(myMoments[iMoment]);
            break;
      case MASS:
        myMoments[iMoment] = mass;
        break;
      default:
        // nothing to be done for other moments
        break;
      }
    }
      }
 
      // normalize moments and copy to Cluster Moment Store
      size_t size= m_validMoments.size();
      for (size_t iMoment = 0; iMoment != size; ++iMoment) {
        xAOD::CaloCluster::MomentType moment = m_validMoments[iMoment];
    if ( myNorms[iMoment] != 0 ) 
      myMoments[iMoment] /= myNorms[iMoment];
    if ( moment == FIRST_PHI ) 
      myMoments[iMoment] = CaloPhiRange::fix(myMoments[iMoment]);
    theCluster->insertMoment(moment,myMoments[iMoment]);
      } // loop on moments for cluster
    } // check on requested moments
    // check on second moment of time if requested
    if ( m_secondTime ) { theCluster->insertMoment(SECOND_TIME,theCluster->secondTime()); }
    // check on number of cells per sampling moment if requested
    if ( m_nCellsPerSampling ) {
      for ( size_t isam(0); isam < nCellsSamp.size(); ++isam ) { 
    theCluster->setNumberCellsInSampling((CaloCell_ID::CaloSample)isam,std::get<0>(nCellsSamp.at(isam)),false);
    if ( isam == (size_t)CaloCell_ID::EME2 && std::get<1>(nCellsSamp.at(isam)) > 0 ) { 
      theCluster->setNumberCellsInSampling((CaloCell_ID::CaloSample)isam,std::get<1>(nCellsSamp.at(isam)),true); 
    }
      } // loop on samplings
      nCellsSamp.clear();
    }
  } // loop on clusters
 
  return StatusCode::SUCCESS;
}