/data/refman/pasoursint/CMSSW_5_3_1/src/TopQuarkAnalysis/TopKinFitter/interface/TtFullLepKinSolver.h

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//based on a code by Jan Valenta
#ifndef TtFullLepKinSolver_h
#define TtFullLepKinSolver_h

#include "AnalysisDataFormats/TopObjects/interface/TtDilepEvtSolution.h"
#include "DataFormats/Candidate/interface/LeafCandidate.h"

#include "TLorentzVector.h"
#include "TMath.h"

class TF2;

class TtFullLepKinSolver {

 public:
 
  TtFullLepKinSolver();
  TtFullLepKinSolver(double,double,double,std::vector<double>);
  ~TtFullLepKinSolver();
  
  inline void useWeightFromMC(bool useMC) { useMCforBest_ = useMC; }
  TtDilepEvtSolution addKinSolInfo(TtDilepEvtSolution * asol); 
  
  void SetConstraints(double xx=0, double yy=0);
  
  struct NeutrinoSolution {
    double weight;
    reco::LeafCandidate neutrino;
    reco::LeafCandidate neutrinoBar; 
  };
  
  NeutrinoSolution getNuSolution(TLorentzVector LV_l, 
                                 TLorentzVector LV_l_, 
                                 TLorentzVector LV_b, 
                                 TLorentzVector LV_b_);                           
                             
 private:
  void FindCoeff(const TLorentzVector al, 
                 const TLorentzVector l,
                 const TLorentzVector b_al,
                 const TLorentzVector b_l,
                 double mt, double mat, double pxboost, double pyboost,
                 double* q_coeff);
  void TopRec(const TLorentzVector al, 
              const TLorentzVector l,
              const TLorentzVector b_al,
              const TLorentzVector b_l, double sol);
  double WeightSolfromMC();
  double WeightSolfromShape();
    
  int quartic(double* q_coeff, double* q_sol);
  int cubic(double* c_coeff, double* c_sol);
  
  //Utility Methods
  double sqr(double x) {return (x*x);}
  void SWAP(double& realone, double& realtwo);
    
 private:
  double topmass_begin;
  double topmass_end;
  double topmass_step;
  double pxmiss_, pymiss_;
  
  double mw, maw, mb, mab;
  
  double C;
  double D;
  double F;
  double pom;
  double k16;
  double k26;
  double k36;
  double k46;
  double k56;
  double k51;
  double k61;
  double m1;
  double m2;
  double m3;
  double n1;
  double n2;
  double n3;
  
  TLorentzVector LV_n, LV_n_, LV_t, LV_t_, LV_tt_t, LV_tt_t_;  
  //provisional
  TLorentzVector genLV_n, genLV_n_;  
    
  // flag to swith from WeightSolfromMC() to WeightSolfromShape()
  bool useMCforBest_;
  // Event shape
  TF2* EventShape_;  
};


#endif