/data/refman/pasoursint/CMSSW_5_3_9_patch3/src/RecoTauTag/RecoTau/plugins/PFRecoTauDiscriminationByTauPolarization.cc

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#include "RecoTauTag/RecoTau/interface/TauDiscriminationProducerBase.h"
#include "RecoTauTag/TauTagTools/interface/PFTauQualityCutWrapper.h"

/* class PFRecoTauDiscriminationByTauPolarization
 * created : May 26 2010,
 * contributors : Sami Lehti (sami.lehti@cern.ch ; HIP, Helsinki)
 */

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

class PFRecoTauDiscriminationByTauPolarization :
  public PFTauDiscriminationProducerBase  {
  public:
    explicit PFRecoTauDiscriminationByTauPolarization(
        const ParameterSet& iConfig)
      :PFTauDiscriminationProducerBase(iConfig) {  // retrieve quality cuts
        rTauMin = iConfig.getParameter<double>("rtau");
        booleanOutput = iConfig.getParameter<bool>("BooleanOutput");
      }

    ~PFRecoTauDiscriminationByTauPolarization(){}

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

  private:
    bool booleanOutput;
    double rTauMin;
};

void PFRecoTauDiscriminationByTauPolarization::beginEvent(
    const Event& event, const EventSetup& eventSetup){}

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

  double rTau = 0;
  // rtau for PFTau has to be calculated for leading PF charged hadronic candidate
  // calculating it from leadingTrack can (and will) give rtau > 1!
  if(tau.isNonnull() && tau->p() > 0
      && tau->leadPFChargedHadrCand().isNonnull()) {
    rTau = tau->leadPFChargedHadrCand()->p()/tau->p();
  }

  if(booleanOutput) return ( rTau > rTauMin ? 1. : 0. );
  return rTau;
}

DEFINE_FWK_MODULE(PFRecoTauDiscriminationByTauPolarization);