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#ifndef IsolationUtils_PtIsolationAlgo_h
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#define IsolationUtils_PtIsolationAlgo_h
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/* \class PtIsolationAlgo<T, C>
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*
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* \author Francesco Fabozzi, INFN
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*/
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#include "PhysicsTools/Utilities/interface/Math.h"
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template <typename T, typename C>
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class PtIsolationAlgo {
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public:
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typedef double value_type;
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PtIsolationAlgo() { }
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PtIsolationAlgo( double dRMin, double dRMax, double dzMax ) :
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dRMin_( dRMin ), dRMax_( dRMax ), dzMax_( dzMax ) { }
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double operator()(const T &, const C &) const;
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private:
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double dRMin_, dRMax_, dzMax_;
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};
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template <typename T, typename C>
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double PtIsolationAlgo<T, C>::operator()(const T & cand, const C & elements) const {
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double ptSum = 0;
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double candVz = cand.vz();
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double candEta = cand.eta();
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double candPhi = cand.phi();
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for( typename C::const_iterator elem = elements.begin(); elem != elements.end(); ++ elem ) {
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double dz = fabs( elem->vz() - candVz );
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double dR = deltaR( elem->eta(), elem->phi(), candEta, candPhi );
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if ( dz < dzMax_ && dR < dRMax_ && dR > dRMin_ ) {
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ptSum += elem->pt();
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}
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}
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return ptSum;
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}
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#endif
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