/data/refman/pasoursint/CMSSW_5_3_4/src/RecoTauTag/RecoTau/plugins/PFRecoTauDiscriminationByNProngs.cc

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#include "RecoTauTag/RecoTau/interface/TauDiscriminationProducerBase.h"
#include "FWCore/Utilities/interface/InputTag.h"

/* class PFRecoTauDiscriminationByNProngs
 * created : August 30 2010,
 * contributors : Sami Lehti (sami.lehti@cern.ch ; HIP, Helsinki)
 * based on H+ tau ID by Lauri Wendland
 */

using namespace reco;
using namespace std;
using namespace edm;

class PFRecoTauDiscriminationByNProngs : public PFTauDiscriminationProducerBase  {
    public:
        explicit PFRecoTauDiscriminationByNProngs(const ParameterSet& iConfig):PFTauDiscriminationProducerBase(iConfig){
                nprongs                 = iConfig.getParameter<uint32_t>("nProngs");
                booleanOutput = iConfig.getParameter<bool>("BooleanOutput");
        }

        ~PFRecoTauDiscriminationByNProngs(){}

        void beginEvent(const edm::Event&, const edm::EventSetup&);
        double discriminate(const reco::PFTauRef&);

    private:

        uint32_t nprongs;
        bool booleanOutput;
};

void PFRecoTauDiscriminationByNProngs::beginEvent(const Event& iEvent, const EventSetup& iSetup){}

double PFRecoTauDiscriminationByNProngs::discriminate(const PFTauRef& tau){

        bool accepted = false;
        int np = tau->signalTracks().size();

        if((np == 1 && (nprongs == 1 || nprongs == 0)) ||
           (np == 3 && (nprongs == 3 || nprongs == 0)) ) accepted = true;

        if(!accepted) np = 0;
        if(booleanOutput) return accepted;
        return np;
}

DEFINE_FWK_MODULE(PFRecoTauDiscriminationByNProngs);