/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/RecoTauTag/RecoTau/plugins/PFRecoTauDiscriminationAgainstMuon.cc

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/* 
 * class PFRecoTauDiscriminationAgainstMuon
 * created : May 07 2008,
 * revised : ,
 * Authors : Sho Maruyama
 */

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

#include "DataFormats/MuonReco/interface/MuonFwd.h"
#include "DataFormats/MuonReco/interface/MuonSelectors.h"

#include "DataFormats/MuonReco/interface/MuonSelectors.h"


#include <string>

using namespace reco;

class PFRecoTauDiscriminationAgainstMuon : public PFTauDiscriminationProducerBase {
   public:
      explicit PFRecoTauDiscriminationAgainstMuon(const edm::ParameterSet& iConfig):PFTauDiscriminationProducerBase(iConfig) {   
         discriminatorOption_  = iConfig.getParameter<std::string>("discriminatorOption");  
         a  = iConfig.getParameter<double>("a");  
         b  = iConfig.getParameter<double>("b");  
         c  = iConfig.getParameter<double>("c");  
      }

      ~PFRecoTauDiscriminationAgainstMuon(){} 

      double discriminate(const PFTauRef& pfTau);

   private:  
      std::string discriminatorOption_;
      double a;
      double b;
      double c;
};

double PFRecoTauDiscriminationAgainstMuon::discriminate(const PFTauRef& thePFTauRef)
{
   bool decision = true;

   if((*thePFTauRef).hasMuonReference() ){

      MuonRef muonref = (*thePFTauRef).leadPFChargedHadrCand()->muonRef();
      if (discriminatorOption_ == "noSegMatch") {
         if ( muonref ->numberOfMatches() > 0 ) {
            decision = false;
         }
      }
      else if (discriminatorOption_ == "twoDCut") {
         double seg = muon::segmentCompatibility(*muonref);
         double calo= muonref->caloCompatibility(); 
         double border = calo * a + seg * b +c;
         if ( border > 0 ) {
            decision = false; 
         } 
      }
      else if (discriminatorOption_ == "merePresence") decision = false;
      else if (discriminatorOption_ == "combined") { // testing purpose only
         unsigned int muType = 0;
         if(muonref->isGlobalMuon()) muType = 1;
         else if(muonref->isCaloMuon()) muType = 2;
         else if(muonref->isTrackerMuon()) muType = 3;
         double muonEnergyFraction = (*thePFTauRef).pfTauTagInfoRef()->pfjetRef()->chargedMuEnergyFraction();
         bool eta_veto = false;
         bool phi_veto = false;
         if(fabs(muonref->eta()) > 2.3 || (fabs(muonref->eta()) > 1.4 && fabs(muonref->eta()) < 1.6)) eta_veto = true;
         if(muonref->phi() < 0.1 && muonref->phi() > -0.1) phi_veto = true;
         if( muType != 1 || muonref ->numberOfMatches() > 0 || eta_veto || phi_veto || muonEnergyFraction > 0.9 ) decision = false; // as place holder
      }
      else if (discriminatorOption_ == "noAllArbitrated") { // One used in H->tautau 2010
        if(muon::isGoodMuon(*muonref,muon::AllArbitrated))
          decision = false;
      }
      else{
         throw edm::Exception(edm::errors::UnimplementedFeature) << " Invalid Discriminator Option! Please check cfi file \n";
      }
   } // valid muon ref

   return (decision ? 1. : 0.);
} 

DEFINE_FWK_MODULE(PFRecoTauDiscriminationAgainstMuon );