This is EGM version of the ECAL position + depth correction calculation. More...

#include <ECAL2DPositionCalcWithDepthCorr.h>

Inheritance diagram for ECAL2DPositionCalcWithDepthCorr:

Public Member Functions
void	calculateAndSetPosition (reco::PFCluster &) override

void	calculateAndSetPositions (reco::PFClusterCollection &) override

	ECAL2DPositionCalcWithDepthCorr (const edm::ParameterSet &conf)

	ECAL2DPositionCalcWithDepthCorr (const ECAL2DPositionCalcWithDepthCorr &)=delete

ECAL2DPositionCalcWithDepthCorr &	operator= (const ECAL2DPositionCalcWithDepthCorr &)=delete

void	update (const edm::EventSetup &es) override

Public Member Functions inherited from PFCPositionCalculatorBase
const std::string &	name () const

PosCalc &	operator= (const PosCalc &)=delete

	PFCPositionCalculatorBase (const edm::ParameterSet &conf)

	PFCPositionCalculatorBase (const PosCalc &)=delete

virtual	~PFCPositionCalculatorBase ()=default

Private Member Functions
void	calculateAndSetPositionActual (reco::PFCluster &) const

Private Attributes
const CaloSubdetectorGeometry *	_ebGeom

const CaloSubdetectorGeometry *	_eeGeom

const CaloSubdetectorGeometry *	_esGeom

bool	_esMinus

bool	_esPlus

const double	_minAllowedNorm

const double	_param_T0_EB

const double	_param_T0_EE

const double	_param_T0_ES

const double	_param_W0

const double	_param_X0

std::unique_ptr< CaloRecHitResolutionProvider >	_timeResolutionCalc

Additional Inherited Members
Protected Attributes inherited from PFCPositionCalculatorBase
const float	_minFractionInCalc

Detailed Description

This is EGM version of the ECAL position + depth correction calculation.

Definition at line 17 of file ECAL2DPositionCalcWithDepthCorr.h.

Constructor & Destructor Documentation

ECAL2DPositionCalcWithDepthCorr::ECAL2DPositionCalcWithDepthCorr ( const edm::ParameterSet & conf )

inline

Definition at line 19 of file ECAL2DPositionCalcWithDepthCorr.h.

References _timeResolutionCalc, calculateAndSetPosition(), calculateAndSetPositions(), edm::ParameterSet::exists(), edm::ParameterSet::getParameterSet(), operator=(), and update().

                                                                :
     PFCPositionCalculatorBase(conf), 
     _param_T0_EB(conf.getParameter<double>("T0_EB")),
     _param_T0_EE(conf.getParameter<double>("T0_EE")),
     _param_T0_ES(conf.getParameter<double>("T0_ES")),
     _param_W0(conf.getParameter<double>("W0")),
     _param_X0(conf.getParameter<double>("X0")),
     _minAllowedNorm(conf.getParameter<double>("minAllowedNormalization")),
     _ebGeom(nullptr),
     _eeGeom(nullptr),
     _esGeom(nullptr),
     _esPlus(false),
     _esMinus(false) {
         _timeResolutionCalc.reset(nullptr);
     if( conf.exists("timeResolutionCalc") ) {
       const edm::ParameterSet& timeResConf = 
         conf.getParameterSet("timeResolutionCalc");
         _timeResolutionCalc.reset(new CaloRecHitResolutionProvider(timeResConf)); 
       }
     }

ECAL2DPositionCalcWithDepthCorr::ECAL2DPositionCalcWithDepthCorr ( const ECAL2DPositionCalcWithDepthCorr & )

delete

Member Function Documentation

void ECAL2DPositionCalcWithDepthCorr::calculateAndSetPosition ( reco::PFCluster & cluster )

overridevirtual

Implements PFCPositionCalculatorBase.

Definition at line 40 of file ECAL2DPositionCalcWithDepthCorr.cc.

References calculateAndSetPositionActual(), and calculateAndSetPositions().

Referenced by ECAL2DPositionCalcWithDepthCorr(), and update().

                                                 {
   calculateAndSetPositionActual(cluster);
 }

void ECAL2DPositionCalcWithDepthCorr::calculateAndSetPositionActual ( reco::PFCluster & cluster ) const

private

Definition at line 52 of file ECAL2DPositionCalcWithDepthCorr.cc.

References _ebGeom, _eeGeom, _esMinus, _esPlus, _minAllowedNorm, _param_T0_EB, _param_T0_EE, _param_T0_ES, _param_W0, _param_X0, _timeResolutionCalc, funct::abs(), reco::PFCluster::calculatePositionREP(), constexpr, egammaForCoreTracking_cff::depth, PFLayer::ECAL_BARREL, PFLayer::ECAL_ENDCAP, reco::PFCluster::energy(), Exception, f, objects.autophobj::float, CaloSubdetectorGeometry::getGeometry(), edm::isFinite(), SiStripPI::max, CMSBoostedTauSeedingParameters_cfi::maxDepth, PFLayer::NONE, reco::PFCluster::recHitFractions(), reco::CaloCluster::seed(), reco::CaloCluster::setEnergy(), reco::PFCluster::setLayer(), reco::CaloCluster::setPosition(), reco::PFCluster::setTime(), reco::PFCluster::setTimeError(), mathSSE::sqrt(), mps_merge::weight, x, PV3DBase< T, PVType, FrameType >::x(), y, PV3DBase< T, PVType, FrameType >::y(), z, and PV3DBase< T, PVType, FrameType >::z().

Referenced by calculateAndSetPosition(), and calculateAndSetPositions().

                                                             {  
   constexpr double preshowerStartEta =  1.653;
   constexpr double preshowerEndEta = 2.6;
   if( !cluster.seed() ) {
     throw cms::Exception("ClusterWithNoSeed")
       << " Found a cluster with no seed: " << cluster;
   }                 
   double cl_energy = 0;  
   double cl_energy_float = 0;
   double cl_time = 0;  
   double cl_timeweight=0.0;
   double max_e = 0.0;  
   double clusterT0 = 0.0;
   PFLayer::Layer max_e_layer = PFLayer::NONE;
   reco::PFRecHitRef refmax;  
   // find the seed and max layer
   for( const reco::PFRecHitFraction& rhf : cluster.recHitFractions() ) {
     const reco::PFRecHitRef& refhit = rhf.recHitRef();
     const double rh_fraction = rhf.fraction();
     const double rh_rawenergy = refhit->energy();
     const double rh_energy = rh_rawenergy * rh_fraction;    
     const double rh_energyf = ((float)rh_rawenergy) * ((float) rh_fraction);
     if( !edm::isFinite(rh_energy) ) {
       throw cms::Exception("PFClusterAlgo")
     <<"rechit " << refhit->detId() << " has non-finite energy... " 
     << "The input of the particle flow clustering seems to be corrupted.";
     }
     cl_energy += rh_energy;
     cl_energy_float += rh_energyf;
     // If time resolution is given, calculate weighted average
     if (_timeResolutionCalc) {
       const double res2 = 1./_timeResolutionCalc->timeResolution2(rh_rawenergy);
       cl_time += rh_fraction*refhit->time()*res2;
       cl_timeweight += rh_fraction*res2;
     }
     else { // assume resolution ~ 1/E**2
       const double rh_rawenergy2 = rh_rawenergy*rh_rawenergy;
       cl_timeweight+=rh_rawenergy2*rh_fraction;
       cl_time += rh_rawenergy2*rh_fraction*refhit->time();
     }
     if( rh_energy > max_e ) {
       max_e = rh_energy;
       max_e_layer = rhf.recHitRef()->layer();
       refmax = refhit;
     }    
   }
   cluster.setEnergy(cl_energy);
   cluster.setTime(cl_time/cl_timeweight);
   if (_timeResolutionCalc) {
     cluster.setTimeError(std::sqrt(1.0f/float(cl_timeweight)));
   }
   cluster.setLayer(max_e_layer);
   const CaloSubdetectorGeometry* ecal_geom = nullptr;
   // get seed geometry information  
   switch(max_e_layer){
   case PFLayer::ECAL_BARREL:
     ecal_geom = _ebGeom;
     clusterT0 = _param_T0_EB;
     break;
   case PFLayer::ECAL_ENDCAP:
     ecal_geom = _eeGeom;
     clusterT0 = _param_T0_EE;        
     break;
   default:
     throw cms::Exception("InvalidLayer")
       << "ECAL Position Calc only accepts ECAL_BARREL or ECAL_ENDCAP";
   }
 
   auto center_cell = ecal_geom->getGeometry(refmax->detId());
   const double ctreta = center_cell->etaPos();
   const double actreta = std::abs(ctreta);
   // need to change T0 if in ES
   if( actreta > preshowerStartEta && actreta < preshowerEndEta ) { 
     if(ctreta > 0 && _esPlus ) clusterT0 = _param_T0_ES;
     if(ctreta < 0 && _esMinus) clusterT0 = _param_T0_ES;
   }  
   // floats to reproduce exactly the EGM code
   const float maxDepth = _param_X0*(clusterT0 + vdt::fast_log(cl_energy_float));
   const float maxToFront = center_cell->getPosition().mag();  
   // calculate the position
   const double logETot_inv = -vdt::fast_log(cl_energy_float);
   double position_norm = 0.0;
   double x(0.0),y(0.0),z(0.0);  
   for( const reco::PFRecHitFraction& rhf : cluster.recHitFractions() ) {
     double weight = 0.0;
     const reco::PFRecHitRef& refhit = rhf.recHitRef();
     const double rh_energy = ((float)refhit->energy()) * ((float)rhf.fraction());
     if( rh_energy > 0.0 ) weight = std::max(0.0,( _param_W0 + 
                           vdt::fast_log(rh_energy) + 
                           logETot_inv ));
     auto cell = ecal_geom->getGeometry(refhit->detId());
     const float depth = maxDepth + maxToFront - cell->getPosition().mag();    
     const GlobalPoint pos =
       static_cast<const TruncatedPyramid*>(cell.get())->getPosition(depth);
 
     x += weight*pos.x() ;
     y += weight*pos.y() ;
     z += weight*pos.z() ;
 
     position_norm += weight ;
   }
   
   // FALL BACK to LINEAR WEIGHTS
   if (position_norm == 0.) {
     for( const reco::PFRecHitFraction& rhf : cluster.recHitFractions() ) {
       double weight = 0.0;
       const reco::PFRecHitRef& refhit = rhf.recHitRef();
       const double rh_energy = ((float)refhit->energy()) * ((float)rhf.fraction());
       if( rh_energy > 0.0 ) 
     weight = rh_energy/cluster.energy();
 
       auto cell = ecal_geom->getGeometry(refhit->detId());
       const float depth = maxDepth + maxToFront - cell->getPosition().mag();
       const GlobalPoint pos = cell->getPosition(depth);
       
       x += weight*pos.x() ;
       y += weight*pos.y() ;
       z += weight*pos.z() ;
 
       position_norm += weight ;
     }
   }
 
   if( position_norm < _minAllowedNorm ) {
     edm::LogError("WeirdClusterNormalization") 
       << "PFCluster too far from seeding cell: set position to (0,0,0).";
     cluster.setPosition(math::XYZPoint(0,0,0));
   } else {
     const double norm_inverse = 1.0/position_norm;
     x *= norm_inverse;
     y *= norm_inverse;
     z *= norm_inverse;
 
     cluster.setPosition(math::XYZPoint(x,y,z));
     cluster.calculatePositionREP();
   }
 }

void ECAL2DPositionCalcWithDepthCorr::calculateAndSetPositions ( reco::PFClusterCollection & clusters )

overridevirtual

Implements PFCPositionCalculatorBase.

Definition at line 45 of file ECAL2DPositionCalcWithDepthCorr.cc.

References calculateAndSetPositionActual().

Referenced by calculateAndSetPosition(), and ECAL2DPositionCalcWithDepthCorr().

                                                             {
   for( reco::PFCluster& cluster : clusters ) {
     calculateAndSetPositionActual(cluster);
   }
 }

ECAL2DPositionCalcWithDepthCorr& ECAL2DPositionCalcWithDepthCorr::operator= ( const ECAL2DPositionCalcWithDepthCorr & )

delete

Referenced by ECAL2DPositionCalcWithDepthCorr().

void ECAL2DPositionCalcWithDepthCorr::update ( const edm::EventSetup & es )

overridevirtual

Reimplemented from PFCPositionCalculatorBase.

Definition at line 19 of file ECAL2DPositionCalcWithDepthCorr.cc.

References _ebGeom, _eeGeom, _esGeom, _esMinus, _esPlus, calculateAndSetPosition(), DetId::Ecal, EcalBarrel, EcalEndcap, EcalPreshower, edm::EventSetup::get(), edm::eventsetup::EventSetupRecord::get(), CaloSubdetectorGeometry::getGeometry(), CaloSubdetectorGeometry::getValidDetIds(), and z.

                                 {
   
     const CaloGeometryRecord& caloGeom = es.get<CaloGeometryRecord>();
     edm::ESHandle<CaloGeometry> geohandle;
     caloGeom.get(geohandle);
     _ebGeom = geohandle->getSubdetectorGeometry(DetId::Ecal,EcalBarrel);
     _eeGeom = geohandle->getSubdetectorGeometry(DetId::Ecal,EcalEndcap);
     _esGeom = geohandle->getSubdetectorGeometry(DetId::Ecal,EcalPreshower);
     if(_esGeom){
       // ripped from RecoEcal/EgammaCoreTools 
       for( uint32_t ic = 0; 
        ic < _esGeom->getValidDetIds().size() && 
          ( !_esPlus || !_esMinus ); ++ic ) {
         const double z = _esGeom->getGeometry( _esGeom->getValidDetIds()[ic] )->getPosition().z();
         _esPlus = _esPlus || ( 0 < z ) ;
         _esMinus = _esMinus || ( 0 > z ) ;
       }  
     }
 }