SuperClusterImporter.cc

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#include "RecoParticleFlow/PFProducer/interface/BlockElementImporterBase.h"
#include "RecoParticleFlow/PFProducer/interface/PhotonSelectorAlgo.h"
#include "DataFormats/ParticleFlowReco/interface/PFClusterFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFCluster.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementSuperCluster.h"
#include "DataFormats/EgammaReco/interface/SuperClusterFwd.h"
#include "DataFormats/EgammaReco/interface/SuperCluster.h"
#include "RecoParticleFlow/PFProducer/interface/PFBlockElementSCEqual.h"

// for single tower H/E
#include "RecoEgamma/EgammaIsolationAlgos/interface/EgammaHadTower.h"

//quick pT for superclusters
inline double ptFast( const double energy,
              const math::XYZPoint& position,
              const math::XYZPoint& origin ) {
  const auto v = position - origin;
  return energy*std::sqrt(v.perp2()/v.mag2());
}

#include <unordered_map>

class SuperClusterImporter : public BlockElementImporterBase {
public:  
  SuperClusterImporter(const edm::ParameterSet&,edm::ConsumesCollector&);
  
  void updateEventSetup( const edm::EventSetup& es ) override;

  void importToBlock( const edm::Event& ,
              ElementList& ) const override;

private:
  edm::EDGetTokenT<reco::SuperClusterCollection> _srcEB,_srcEE;  
  edm::EDGetTokenT<CaloTowerCollection> _srcTowers;
  const double _maxHoverE, _pTbyPass, _minSCPt;
  std::unique_ptr<EgammaHadTower> _hadTower;
  bool _superClustersArePF;
  static const math::XYZPoint _zero;
};

const math::XYZPoint SuperClusterImporter::_zero = math::XYZPoint(0,0,0);

DEFINE_EDM_PLUGIN(BlockElementImporterFactory, 
          SuperClusterImporter, 
          "SuperClusterImporter");

SuperClusterImporter::SuperClusterImporter(const edm::ParameterSet& conf,
                   edm::ConsumesCollector& sumes) :
    BlockElementImporterBase(conf,sumes),
    _srcEB(sumes.consumes<reco::SuperClusterCollection>(conf.getParameter<edm::InputTag>("source_eb"))),
    _srcEE(sumes.consumes<reco::SuperClusterCollection>(conf.getParameter<edm::InputTag>("source_ee"))),
    _srcTowers(sumes.consumes<CaloTowerCollection>(conf.getParameter<edm::InputTag>("source_towers"))),
    _maxHoverE(conf.getParameter<double>("maximumHoverE")),
    _pTbyPass(conf.getParameter<double>("minPTforBypass")),
    _minSCPt(conf.getParameter<double>("minSuperClusterPt")),
    _hadTower(nullptr),
    _superClustersArePF(conf.getParameter<bool>("superClustersArePF")) {  
}

void SuperClusterImporter::
updateEventSetup(const edm::EventSetup& es) {
  _hadTower.reset(new EgammaHadTower(es,EgammaHadTower::SingleTower));
}

void SuperClusterImporter::
importToBlock( const edm::Event& e, 
           BlockElementImporterBase::ElementList& elems ) const {
  auto eb_scs = e.getHandle(_srcEB);
  auto ee_scs = e.getHandle(_srcEE);
  auto towers = e.getHandle(_srcTowers);
  _hadTower->setTowerCollection(towers.product());
  elems.reserve(elems.size()+eb_scs->size()+ee_scs->size());
  // setup our elements so that all the SCs are grouped together
  auto SCs_end = std::partition(elems.begin(),elems.end(),
                [](auto const& a){
                  return a->type() == reco::PFBlockElement::SC;
                });  
  // add eb superclusters
  auto bsc = eb_scs->cbegin();
  auto esc = eb_scs->cend();
  reco::PFBlockElementSuperCluster* scbe = nullptr;
  reco::SuperClusterRef scref;
  for( auto sc = bsc; sc != esc; ++sc ) {
    scref = reco::SuperClusterRef(eb_scs,std::distance(bsc,sc));
    PFBlockElementSCEqual myEqual(scref);
    auto sc_elem = std::find_if(elems.begin(),SCs_end,myEqual);
    const double scpT = ptFast(sc->energy(),sc->position(),_zero);    
    const double H_tower = ( _hadTower->getDepth1HcalESum(*sc) +
                 _hadTower->getDepth2HcalESum(*sc)   );
    const double HoverE = H_tower/sc->energy();
    if( sc_elem == SCs_end && scpT > _minSCPt &&
    (scpT > _pTbyPass || HoverE < _maxHoverE) ) {   
      scbe = new reco::PFBlockElementSuperCluster(scref);      
      scbe->setFromPFSuperCluster(_superClustersArePF);
      SCs_end = elems.emplace(SCs_end, scbe);
      ++SCs_end; // point to element *after* the new one
    }    
  }// loop on eb superclusters
  // add ee superclusters
  bsc = ee_scs->cbegin();
  esc = ee_scs->cend();
  for( auto sc = bsc; sc != esc; ++sc ) {
    scref = reco::SuperClusterRef(ee_scs,std::distance(bsc,sc));
    PFBlockElementSCEqual myEqual(scref);
    auto sc_elem = std::find_if(elems.begin(),SCs_end,myEqual);
    const double scpT = ptFast(sc->energy(),sc->position(),_zero);    
    const double H_tower = ( _hadTower->getDepth1HcalESum(*sc) +
                 _hadTower->getDepth2HcalESum(*sc)   );
    const double HoverE = H_tower/sc->energy();
    if( sc_elem == SCs_end && scpT > _minSCPt &&
    (scpT > _pTbyPass || HoverE < _maxHoverE)) {    
      scbe = new reco::PFBlockElementSuperCluster(scref);  
      scbe->setFromPFSuperCluster(_superClustersArePF);
      SCs_end = elems.emplace(SCs_end, scbe);
      ++SCs_end; // point to element *after* the new one
    }    
  }// loop on ee superclusters
  elems.shrink_to_fit();
}