TtSemiLepKinFitter.h

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#ifndef TtSemiLepKinFitter_h
#define TtSemiLepKinFitter_h

#include <vector>

#include "TLorentzVector.h"

#include "DataFormats/PatCandidates/interface/Lepton.h"

#include "AnalysisDataFormats/TopObjects/interface/TtSemiEvtSolution.h"

#include "AnalysisDataFormats/TopObjects/interface/TtSemiLepEvtPartons.h"

#include "TopQuarkAnalysis/TopKinFitter/interface/TopKinFitter.h"
#include "TopQuarkAnalysis/TopKinFitter/interface/CovarianceMatrix.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"

class TAbsFitParticle;
class TFitConstraintM;
class TFitConstraintEp;

/*
  \class   TtSemiLepKinFitter TtSemiLepKinFitter.h "TopQuarkAnalysis/TopKinFitter/interface/TtSemiLepKinFitter.h"
  
  \brief   one line description to be added here...

  text to be added here...
  
**/

class TtSemiLepKinFitter : public TopKinFitter {
  
 public:
  
  enum Constraint { kWHadMass = 1, kWLepMass, kTopHadMass, kTopLepMass, kNeutrinoMass, kEqualTopMasses, kSumPt };

 public:
  explicit TtSemiLepKinFitter();
  explicit TtSemiLepKinFitter(Param jetParam, Param lepParam, Param metParam, int maxNrIter, double maxDeltaS, double maxF,
                  const std::vector<Constraint>& constraints, double mW=80.4, double mTop=173.,
                  const std::vector<edm::ParameterSet>* udscResolutions=nullptr, 
                  const std::vector<edm::ParameterSet>* bResolutions   =nullptr,
                  const std::vector<edm::ParameterSet>* lepResolutions =nullptr, 
                  const std::vector<edm::ParameterSet>* metResolutions =nullptr,
                  const std::vector<double>* jetEnergyResolutionScaleFactors=nullptr,
                  const std::vector<double>* jetEnergyResolutionEtaBinning  =nullptr);
  ~TtSemiLepKinFitter();

  template <class LeptonType> int fit(const std::vector<pat::Jet>& jets, const pat::Lepton<LeptonType>& leps, const pat::MET& met);
  int fit(const TLorentzVector& p4HadP, const TLorentzVector& p4HadQ, const TLorentzVector& p4HadB, const TLorentzVector& p4LepB,
      const TLorentzVector& p4Lepton, const TLorentzVector& p4Neutrino, const int leptonCharge, const CovarianceMatrix::ObjectType leptonType);
  int fit(const TLorentzVector& p4HadP, const TLorentzVector& p4HadQ, const TLorentzVector& p4HadB, const TLorentzVector& p4LepB,
      const TLorentzVector& p4Lepton, const TLorentzVector& p4Neutrino,
      const TMatrixD& covHadP, const TMatrixD& covHadQ, const TMatrixD& covHadB, const TMatrixD& covLepB,
      const TMatrixD& covLepton, const TMatrixD& covNeutrino,
      const int leptonCharge);
  const pat::Particle fittedHadB() const { return (fitter_->getStatus()==0 ? fittedHadB_ : pat::Particle()); };
  const pat::Particle fittedHadP() const { return (fitter_->getStatus()==0 ? fittedHadP_ : pat::Particle()); };
  const pat::Particle fittedHadQ() const { return (fitter_->getStatus()==0 ? fittedHadQ_ : pat::Particle()); };
  const pat::Particle fittedLepB() const { return (fitter_->getStatus()==0 ? fittedLepB_ : pat::Particle()); };
  const pat::Particle fittedLepton() const { return (fitter_->getStatus()==0 ? fittedLepton_ : pat::Particle()); };
  const pat::Particle fittedNeutrino() const { return (fitter_->getStatus()==0 ? fittedNeutrino_ : pat::Particle()); };
  TtSemiEvtSolution addKinFitInfo(TtSemiEvtSolution* asol);
  
 private:
  void printSetup() const;
  void setupFitter();
  void setupJets();
  void setupLeptons();
  void setupConstraints();
  
 private:
  TAbsFitParticle* hadB_;
  TAbsFitParticle* hadP_;
  TAbsFitParticle* hadQ_;
  TAbsFitParticle* lepB_;
  TAbsFitParticle* lepton_;
  TAbsFitParticle* neutrino_;
  const std::vector<edm::ParameterSet>* udscResolutions_;
  const std::vector<edm::ParameterSet>* bResolutions_;
  const std::vector<edm::ParameterSet>* lepResolutions_;
  const std::vector<edm::ParameterSet>* metResolutions_;
  const std::vector<double>* jetEnergyResolutionScaleFactors_;
  const std::vector<double>* jetEnergyResolutionEtaBinning_;
  CovarianceMatrix* covM_;
  std::map<Constraint, TFitConstraintM*> massConstr_;
  TFitConstraintEp* sumPxConstr_;
  TFitConstraintEp* sumPyConstr_;
  pat::Particle fittedHadB_;
  pat::Particle fittedHadP_;
  pat::Particle fittedHadQ_;
  pat::Particle fittedLepB_;
  pat::Particle fittedLepton_;
  pat::Particle fittedNeutrino_;
  Param  jetParam_;
  Param lepParam_;
  Param metParam_;
  std::vector<Constraint> constrList_;
  bool constrainSumPt_;
};

template <class LeptonType>
int TtSemiLepKinFitter::fit(const std::vector<pat::Jet>& jets, const pat::Lepton<LeptonType>& lepton, const pat::MET& neutrino)
{
  if( jets.size()<4 )
    throw edm::Exception( edm::errors::Configuration, "Cannot run the TtSemiLepKinFitter with less than 4 jets" );

  // get jets in right order
  const pat::Jet hadP = jets[TtSemiLepEvtPartons::LightQ   ];
  const pat::Jet hadQ = jets[TtSemiLepEvtPartons::LightQBar];
  const pat::Jet hadB = jets[TtSemiLepEvtPartons::HadB     ];
  const pat::Jet lepB = jets[TtSemiLepEvtPartons::LepB     ];
 
  // initialize particles
  const TLorentzVector p4HadP( hadP.px(), hadP.py(), hadP.pz(), hadP.energy() );
  const TLorentzVector p4HadQ( hadQ.px(), hadQ.py(), hadQ.pz(), hadQ.energy() );
  const TLorentzVector p4HadB( hadB.px(), hadB.py(), hadB.pz(), hadB.energy() );
  const TLorentzVector p4LepB( lepB.px(), lepB.py(), lepB.pz(), lepB.energy() );
  const TLorentzVector p4Lepton  ( lepton.px(), lepton.py(), lepton.pz(), lepton.energy() );
  const TLorentzVector p4Neutrino( neutrino.px(), neutrino.py(), 0, neutrino.et() );

  // initialize covariance matrices
  TMatrixD covHadP = covM_->setupMatrix(hadP, jetParam_);
  TMatrixD covHadQ = covM_->setupMatrix(hadQ, jetParam_);
  TMatrixD covHadB = covM_->setupMatrix(hadB, jetParam_, "bjets");
  TMatrixD covLepB = covM_->setupMatrix(lepB, jetParam_, "bjets");
  TMatrixD covLepton   = covM_->setupMatrix(lepton  , lepParam_);
  TMatrixD covNeutrino = covM_->setupMatrix(neutrino, metParam_);

  // now do the part that is fully independent of PAT features
  return fit(p4HadP, p4HadQ, p4HadB, p4LepB, p4Lepton, p4Neutrino,
         covHadP, covHadQ, covHadB, covLepB, covLepton, covNeutrino,
         lepton.charge());
}


#endif