/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/DataFormats/TauReco/interface/PFTauDecayMode.h

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#ifndef DataFormats_TauReco_PFTauDecayMode_h
#define DataFormats_TauReco_PFTauDecayMode_h

/* class PFTauDecayMode
 * 
 * Stores information for determing the type of hadronic decay of a tau lepton
 *
 * Associated to a reco::PFTau object
 * Provides functionality for:
 *      - merging gamma candidates into candidate PiZeroes
 *      - indexing reconstructed hadronic decay mode
 *      - computing vertex information for multi-prong
 *      - filtering suspected underlying event
 *                          
 * author: Evan K. Friis, UC Davis (evan.klose.friis@cern.ch)
 * created: Mon Jun 30 13:53:59 PDT 2008
 */

#include "DataFormats/Candidate/interface/CompositeCandidate.h"
#include "DataFormats/Candidate/interface/VertexCompositeCandidate.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"
#include "DataFormats/TauReco/interface/PFTau.h"
#include "DataFormats/TauReco/interface/PFTauDecayModeFwd.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

namespace reco {
   class PFTauDecayMode : public CompositeCandidate {
      public:

      const static unsigned char maxNumberOfPiZeroCandidatesAllowed = 4;  //to help with indexing.  changing this value necissitates changing the enum below

      enum hadronicTauDecayModes 
      {
         tauDecay1ChargedPion0PiZero,
         tauDecay1ChargedPion1PiZero,  // rho (770 MeV) mediated)
         tauDecay1ChargedPion2PiZero,  // a1  (1.2 GeV) mediated
         tauDecay1ChargedPion3PiZero,  // contaminated or unmerged photo
         tauDecay1ChargedPion4PiZero,  // contaminated or unmerged photo
         tauDecay2ChargedPion0PiZero,  // extra track or un-recod track
         tauDecay2ChargedPion1PiZero,  // extra track or un-recod track
         tauDecay2ChargedPion2PiZero,  // extra track or un-recod track
         tauDecay2ChargedPion3PiZero,  // extra track or un-recod track
         tauDecay2ChargedPion4PiZero,  // extra track or un-recod track
         tauDecay3ChargedPion0PiZero,  // a1  (1.2 GeV) mediated
         tauDecay3ChargedPion1PiZero,  // a1  (1.2 GeV) mediated
         tauDecay3ChargedPion2PiZero,  // a1  (1.2 GeV) mediated
         tauDecay3ChargedPion3PiZero,  // a1  (1.2 GeV) mediated
         tauDecay3ChargedPion4PiZero,  // a1  (1.2 GeV) mediated
         tauDecaysElectron,
         tauDecayMuon,
         tauDecayOther                 // catch-all
      };

      PFTauDecayMode(){}
      PFTauDecayMode( Charge q,const LorentzVector& p4,const Point & vtx = Point( 0, 0, 0 ), 
                      int pdgId = 12, int status = 2, bool integerCharge = true):CompositeCandidate(q, p4, vtx, pdgId, status, integerCharge){}

      PFTauDecayMode(const VertexCompositeCandidate&                 chargedPions, 
                     const CompositeCandidate&                       piZeroes,
                     const CompositeCandidate&                       filteredObjects);

      virtual ~PFTauDecayMode(){}
      PFTauDecayMode* clone() const;

      const PFTauRef& pfTauRef() const          { return pfTauRef_;  }
      void  setPFTauRef(const PFTauRef& theTau) { pfTauRef_ = theTau;}

      hadronicTauDecayModes getDecayMode() const                             { return theDecayMode_;         }
      void                  setDecayMode(hadronicTauDecayModes theDecayMode) { theDecayMode_ = theDecayMode; }

      const VertexCompositeCandidate&                   chargedPions() const;
      const CompositeCandidate&                         neutralPions() const;
      const CompositeCandidate&                         filteredObjects() const;

      std::vector<const Candidate*>                     chargedPionCandidates() const;
      std::vector<const Candidate*>                     neutralPionCandidates() const;
      std::vector<const Candidate*>                     decayProductCandidates() const;
      std::vector<const Candidate*>                     filteredObjectCandidates(int absCharge = -2) const;
      std::vector<const Candidate*>                     neutralFilteredObjectCandidates() const;
      std::vector<const Candidate*>                     chargedFilteredObjectCandidates() const;

      void                                              pfMasterClones(const Candidate* input, PFCandidateRefVector& toFill) const;

      PFCandidateRefVector                              associatedChargedPFCandidates() const;
      PFCandidateRefVector                              associatedNeutralPFCandidates() const;
      PFCandidateRefVector                              filteredPFCandidates() const;         

      protected:
      PFTauRef                                  pfTauRef_;
      VertexCompositeCandidate                  chargedPions_;
      CompositeCandidate                        piZeroes_;
      CompositeCandidate                        filteredObjects_;  // stores objects considered UE
      hadronicTauDecayModes                     theDecayMode_;
   };
}

#endif