Multi5x5BremRecoveryClusterAlgo.cc

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#include "RecoEcal/EgammaClusterAlgos/interface/Multi5x5BremRecoveryClusterAlgo.h"
#include "RecoEcal/EgammaCoreTools/interface/BremRecoveryPhiRoadAlgo.h"

reco::SuperClusterCollection Multi5x5BremRecoveryClusterAlgo::makeSuperClusters(reco::CaloClusterPtrVector & clustersCollection)
{

    const float etaBorder = 1.479;
    superclusters_v.clear();

    // create vectors of references to clusters of a specific origin...
    reco::CaloClusterPtrVector islandClustersBarrel_v;
    reco::CaloClusterPtrVector islandClustersEndCap_v;

    // ...and populate them:
    for (reco::CaloCluster_iterator it = clustersCollection.begin(); it != clustersCollection.end(); it++)
    {
        reco::CaloClusterPtr cluster_p = *it;
        if (cluster_p->algo() == reco::CaloCluster::multi5x5) 
        {
            if (fabs(cluster_p->position().eta()) < etaBorder)
            {
                islandClustersBarrel_v.push_back(cluster_p);
            }
            else
            {
                islandClustersEndCap_v.push_back(cluster_p);
            }
        }
    }

    // make the superclusters from the Barrel clusters - Island
    makeIslandSuperClusters(islandClustersBarrel_v, eb_rdeta_, eb_rdphi_);
    // make the superclusters from the EndCap clusters - Island
    makeIslandSuperClusters(islandClustersEndCap_v, ec_rdeta_, ec_rdphi_);

    return superclusters_v;
}

#include "DataFormats/Math/interface/Vector3D.h"

void Multi5x5BremRecoveryClusterAlgo::makeIslandSuperClusters(reco::CaloClusterPtrVector &clusters_v, 
        double etaRoad, double phiRoad)
{

    std::vector<DetId> usedSeedDetIds;
    usedSeedDetIds.clear();

    for (reco::CaloCluster_iterator currentSeed = clusters_v.begin(); currentSeed != clusters_v.end(); ++currentSeed)
    {

        // check this seed was not already used
        if (std::find(usedSeedDetIds.begin(), usedSeedDetIds.end(), (*currentSeed)->seed()) 
            != usedSeedDetIds.end()) continue;

        // Does our highest energy cluster have high enough energy?
        // changed this to continue from break (to be robust against the order of sorting of the seed clusters)
        if ((*currentSeed)->energy() * sin((*currentSeed)->position().theta()) < seedTransverseEnergyThreshold) continue;

        // if yes, make it a seed for a new SuperCluster:
        double energy = (*currentSeed)->energy();
        math::XYZVector position_((*currentSeed)->position().X(), 
                (*currentSeed)->position().Y(), 
                (*currentSeed)->position().Z());
        position_ *= energy;
        usedSeedDetIds.push_back((*currentSeed)->seed());

        if (verbosity <= pINFO)
        {
            std::cout << "*****************************" << std::endl;
            std::cout << "******NEW SUPERCLUSTER*******" << std::endl;
            std::cout << "Seed R = " << (*currentSeed)->position().Rho() << std::endl;
        }

        // and add the matching clusters:
        reco::CaloClusterPtrVector constituentClusters;
        constituentClusters.push_back(*currentSeed);
        reco::CaloCluster_iterator currentCluster = currentSeed + 1;

        while (currentCluster != clusters_v.end())
        {

            // if dynamic phi road is enabled then compute the phi road for a cluster
            // of energy of existing clusters + the candidate cluster.
            if (dynamicPhiRoad_)
                phiRoad = phiRoadAlgo_->endcapPhiRoad(energy + (*currentCluster)->energy());

            // does the cluster match the phi road for this candidate supercluster
            if (match(*currentSeed, *currentCluster, etaRoad, phiRoad) &&
                std::find(usedSeedDetIds.begin(), usedSeedDetIds.end(), (*currentCluster)->seed()) == usedSeedDetIds.end())
            {

                // add basic cluster to supercluster constituents
                constituentClusters.push_back(*currentCluster);
                energy   += (*currentCluster)->energy();
                position_ += (*currentCluster)->energy() * math::XYZVector((*currentCluster)->position().X(),
                        (*currentCluster)->position().Y(), 
                        (*currentCluster)->position().Z());

                // remove cluster from vector of available clusters
                usedSeedDetIds.push_back((*currentCluster)->seed());

                if (verbosity <= pINFO) 
                    std::cout << "Cluster R = " << (*currentCluster)->position().Rho() << std::endl;
            }
            ++currentCluster;

        }

        position_ /= energy;

        if (verbosity <= pINFO)
            std::cout << "Final SuperCluster R = " << position_.Rho() << std::endl;

        reco::SuperCluster newSuperCluster(energy, 
                math::XYZPoint(position_.X(), position_.Y(), position_.Z()), 
                (*currentSeed), 
                constituentClusters);

        superclusters_v.push_back(newSuperCluster);

        if (verbosity <= pINFO)
        {
            std::cout << "created a new supercluster of: " << std::endl;
            std::cout << "Energy = " << newSuperCluster.energy() << std::endl;
            std::cout << "Position in (R, phi, theta) = (" 
                << newSuperCluster.position().Rho() << ", " 
                << newSuperCluster.position().phi() << ", "
                << newSuperCluster.position().theta() << ")" << std::endl;
        }

    }

    clusters_v.clear();

}


bool Multi5x5BremRecoveryClusterAlgo::match(reco::CaloClusterPtr seed_p, 
        reco::CaloClusterPtr cluster_p,
        double dEtaMax, double dPhiMax)
{
    math::XYZPoint clusterPosition = cluster_p->position();
    math::XYZPoint seedPosition = seed_p->position();

    double dPhi = acos(cos(seedPosition.phi() - clusterPosition.phi()));

    double dEta = fabs(seedPosition.eta() - clusterPosition.eta());

    if (dEta > dEtaMax) return false;
    if (dPhi > dPhiMax) return false;

    return true;
}