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#ifndef IsolationUtils_CalIsolationAlgo_h
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#define IsolationUtils_CalIsolationAlgo_h
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#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
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#include "DataFormats/GeometryVector/interface/GlobalVector.h"
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#include "PhysicsTools/Utilities/interface/Math.h"
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#include "PhysicsTools/IsolationUtils/interface/PropagateToCal.h"
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template <typename T1, typename C2>
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class CalIsolationAlgo {
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public:
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typedef double value_type;
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CalIsolationAlgo( ) { }
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CalIsolationAlgo(double dRMin, double dRMax, bool do_propagation,
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double radius, double minZ, double maxZ, bool theIgnoreMaterial):
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dRMin_( dRMin ), dRMax_( dRMax ), do_propagation_( do_propagation ),
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SrcAtCal(radius, minZ, maxZ, theIgnoreMaterial) { }
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~CalIsolationAlgo();
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void setBfield( const MagneticField * bField ) {
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bField_ = bField; }
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double operator()(const T1 &, const C2 &) const;
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private:
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double dRMin_, dRMax_;
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bool do_propagation_;
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const MagneticField * bField_;
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PropagateToCal SrcAtCal;
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};
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template <typename T1, typename C2>
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CalIsolationAlgo<T1,C2>::~CalIsolationAlgo() {
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}
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template <typename T1, typename C2> double CalIsolationAlgo<T1,C2>::
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operator()(const T1 & cand, const C2 & elements) const {
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const GlobalPoint Vertex(cand.vx(), cand.vy(), cand.vz());//@@check if this is [cm]!
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GlobalVector Cand(cand.pt(), cand.eta(), cand.phi());
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///Extrapolate charged particles from their vertex to the point of entry into the
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///calorimeter, if this is requested in the cfg file.
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if (do_propagation_ && cand.charge()!=0)
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SrcAtCal.propagate(Vertex, Cand, cand.charge(), bField_);
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double etSum = 0;
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for( typename C2::const_iterator elem = elements.begin();
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elem != elements.end(); ++elem ) {
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double dR = deltaR( elem->eta(), elem->phi(),
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(double)Cand.eta(), (double)Cand.phi() );
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if ( dR < dRMax_ && dR > dRMin_ ) {
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etSum += elem->et();
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}
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}
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return etSum;
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}
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#endif
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