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// $Id: PhotonCleaningMod.cc,v 1.6 2009/11/02 12:28:25 sixie Exp $
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#include "MitPhysics/Mods/interface/PhotonCleaningMod.h"
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#include "MitCommon/MathTools/interface/MathUtils.h"
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#include "MitAna/DataTree/interface/ElectronCol.h"
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#include "MitAna/DataTree/interface/PhotonCol.h"
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#include "MitPhysics/Init/interface/ModNames.h"
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using namespace mithep;
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ClassImp(mithep::PhotonCleaningMod)
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//--------------------------------------------------------------------------------------------------
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PhotonCleaningMod::PhotonCleaningMod(const char *name, const char *title) :
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BaseMod(name,title),
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fCleanElectronsName(ModNames::gkCleanElectronsName),
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fGoodPhotonsName(ModNames::gkGoodPhotonsName),
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fCleanPhotonsName(ModNames::gkCleanPhotonsName),
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fMinDeltaRToElectron(0.3)
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{
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// Constructor.
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}
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//--------------------------------------------------------------------------------------------------
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void PhotonCleaningMod::Process()
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{
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// Process entries of the tree.
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// get input collections
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const PhotonCol *GoodPhotons = GetObjThisEvt<PhotonCol>(fGoodPhotonsName);
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const ElectronCol *CleanElectrons = GetObjThisEvt<ElectronCol>(fCleanElectronsName);
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// create output collection
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PhotonOArr *CleanPhotons = new PhotonOArr;
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CleanPhotons->SetName(fCleanPhotonsName);
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// remove any photon that overlaps in eta, phi with an isolated electron.
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UInt_t n = GoodPhotons->GetEntries();
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for (UInt_t i=0; i<n; ++i) {
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const Photon *ph = GoodPhotons->At(i);
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Bool_t isElectronOverlap = false;
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// check for overlap with an electron
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if (CleanElectrons) {
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UInt_t n2 = CleanElectrons->GetEntries();
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for (UInt_t j=0; j<n2; j++) {
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Double_t deltaR = MathUtils::DeltaR(CleanElectrons->At(j)->SCluster()->Eta(),
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CleanElectrons->At(j)->SCluster()->Phi(),
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ph->SCluster()->Eta(), ph->SCluster()->Phi());
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if (deltaR < fMinDeltaRToElectron) {
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isElectronOverlap = kTRUE;
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break;
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}
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}
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}
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if (isElectronOverlap)
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continue;
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CleanPhotons->Add(ph);
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}
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// sort according to pt
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CleanPhotons->Sort();
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// add to event for other modules to use
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AddObjThisEvt(CleanPhotons);
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}
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