/data/refman/pasoursint/CMSSW_5_2_9/src/TopQuarkAnalysis/TopPairBSM/interface/JetCombinatorics.h

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#ifndef JetCombinatorics_h
#define JetCombinatorics_h

#include "TLorentzVector.h"
#include "TString.h"
#include "TH1F.h"
#include "TFile.h"
#include "TMath.h"
#include <map>
#include <vector>
#include <iostream>

class Combo {


  public:

        Combo() {
                
          MW = 84.2;//79.8;
          Mtop_h = 180.7;//175.;
          Mtop_l = 174.9;
          sigmaHadW = 10.5;//2.*7.6;
          sigmaHadt = 19.2;//2.*12.5;
          sigmaLept = 24.2;//2.*15.6;

          SumEt_ = 0.;
          usebtag_ = false;
          useMtop_ = true;

          useFlv_ = false;
          Wp_flv_ = Wq_flv_ = Hadb_flv_ = Lepb_flv_ = 1.;
        }
        ~Combo(){};

        void SetWp(TLorentzVector Wp) { Wp_ = Wp; }
        void SetWq(TLorentzVector Wq) { Wq_ = Wq; }
        void SetHadb(TLorentzVector Hadb) { Hadb_ = Hadb; }
        void SetLepW(TLorentzVector LepW) { LepW_ = LepW; }
        void SetLepb(TLorentzVector Lepb) { Lepb_ = Lepb; }
        // flavor corrections
        void ApplyFlavorCorrections(bool option=true){ useFlv_ = option;}
        void SetFlvCorrWp( double corr ) { Wp_flv_ = corr; }
        void SetFlvCorrWq( double corr ) { Wq_flv_ = corr; }
        void SetFlvCorrHadb( double corr ) { Hadb_flv_ = corr; }
        void SetFlvCorrLepb( double corr ) { Lepb_flv_ = corr; }
        // b tagging
        void SetWp_disc(double disc) { Wp_disc_ = disc;}
        void SetWq_disc(double disc) { Wq_disc_= disc;}
        void SetHadb_disc(double disc) { Hadb_disc_= disc;}
        void SetLepb_disc(double disc) { Lepb_disc_= disc;}
        void SetbDiscPdf(TString filename) { 
          pdffile_ = TFile::Open(filename);
          hdisc_b_ = (TH1F*) gDirectory->Get("hdiscNorm_b");
          hdisc_cl_ = (TH1F*) gDirectory->Get("hdiscNorm_cl");
        }
        void SetSigmas(int type=0) {

          // type == 0 take defaults
          if (type==1) {
            // JES +10%
            MW = 87.2;
            Mtop_h = 193.2;
            Mtop_l = 179.0;
            sigmaHadW = 13.0;
            sigmaHadt = 22.8;
            sigmaLept = 26.3;
          }
          if (type==-1) {
            // JES -10%
            MW = 81.6;
            Mtop_h = 169.3;
            Mtop_l = 171.4;
            sigmaHadW =8.9;
            sigmaHadt =17.9;
            sigmaLept =22.6;
          }

        }
        void Usebtagging(bool option = true) { usebtag_ = option;}
        void SetMinMassLepW( double mass ) { minMassLepW_ = mass; }
        void SetMaxMassLepW( double mass ) { maxMassLepW_ = mass; }
        void SetMinMassHadW( double mass ) { minMassHadW_ = mass; }
        void SetMaxMassHadW( double mass ) { maxMassHadW_ = mass; }
        void SetMinMassLepTop( double mass ) { minMassLepTop_ = mass; }
        void SetMaxMassLepTop( double mass ) { maxMassLepTop_ = mass; }
        void UseMtopConstraint(bool option=true) { useMtop_ = option; }
                
        void analyze() {

                if ( useFlv_ ) {
                        Wp_ = Wp_flv_ * Wp_;
                        Wq_ = Wq_flv_ * Wq_;
                        Hadb_ = Hadb_flv_ * Hadb_;
                        Lepb_ = Lepb_flv_ * Lepb_;
                }

                HadW_ = Wp_ + Wq_;
                HadTop_ = HadW_ + Hadb_;
                LepTop_ = LepW_ + Lepb_;
                TopPair_ = HadTop_ + LepTop_;

                //double sigmaHadW = 10.5;//2.*7.6;
                //double sigmaHadt = 19.2;//2.*12.5;
                //double sigmaLept = 24.2;//2.*15.6;
                
                double chiHadW = (HadW_.M() - MW)/sigmaHadW;
                double chiHadt = (HadTop_.M() - Mtop_h)/sigmaHadt;
                double chiLept = (LepTop_.M() - Mtop_l)/sigmaLept;

                if ( useMtop_ ) {
                        chi2_ = chiHadW*chiHadW + chiHadt*chiHadt + chiLept*chiLept;
                        Ndof_ = 3;
                } else {
                        chi2_ = chiHadW*chiHadW + (HadTop_.M() - LepTop_.M())*(HadTop_.M() - LepTop_.M())/(sigmaHadt*sigmaHadt+sigmaLept*sigmaLept);
                        Ndof_ = 2;
                }
                
                SumEt_ = HadTop_.Pt();

                if ( usebtag_ ) {

                        double gauss_norm = (2.)*TMath::Log(sigmaHadW*TMath::Sqrt(2*TMath::Pi())) +
                                (2.)*TMath::Log(sigmaHadt*TMath::Sqrt(2*TMath::Pi())) + (2.)*TMath::Log(sigmaLept*TMath::Sqrt(2*TMath::Pi()));

                        double LR_Wp; double LR_Wq;
                        double LR_Hadb; double LR_Lepb;

                        double LR_den = 0;
                        LR_den = ( getPdfValue("cl", Wp_disc_) + getPdfValue("b", Wp_disc_));
                        if (LR_den == 0 ) LR_Wp = 1e-5;
                        else LR_Wp = getPdfValue( "cl", Wp_disc_ )/ LR_den;

                        LR_den = ( getPdfValue("cl", Wq_disc_) + getPdfValue("b", Wq_disc_));
                        if (LR_den == 0 ) LR_Wq = 1e-5;
                        else LR_Wq = getPdfValue( "cl", Wq_disc_ )/ LR_den;

                        LR_den = ( getPdfValue("cl", Hadb_disc_) + getPdfValue("b", Hadb_disc_));
                        if (LR_den == 0 ) LR_Hadb = 1e-5;
                        else LR_Hadb = getPdfValue( "b", Hadb_disc_ )/ LR_den;

                        LR_den = ( getPdfValue("cl", Lepb_disc_) + getPdfValue("b", Lepb_disc_));
                        if (LR_den == 0 ) LR_Lepb = 1e-5;
                        else LR_Lepb = getPdfValue( "b", Lepb_disc_ )/ LR_den;

                        double btag_norm = (-0.25-TMath::Log(4)/2);
                        double btag_N2LL = btag_norm*4.*( LR_Wp * TMath::Log(LR_Wp/4) + LR_Wq*TMath::Log(LR_Wq/4) + LR_Hadb*TMath::Log(LR_Hadb/4) + LR_Lepb*TMath::Log(LR_Lepb/4) );
                  
                        chi2_ += btag_N2LL + gauss_norm;
                        Ndof_ += 3;
                        pdffile_->Close();
                }
        }

        TLorentzVector GetWp() { return Wp_; }
        TLorentzVector GetWq() { return Wq_; }
        TLorentzVector GetHadW() { return HadW_; }
        TLorentzVector GetLepW() { return LepW_; }
        TLorentzVector GetHadb() { return Hadb_; }
        TLorentzVector GetLepb() { return Lepb_; }
        TLorentzVector GetHadTop() { return HadTop_; }
        TLorentzVector GetLepTop() { return LepTop_; }
        TLorentzVector GetTopPair() { return TopPair_; }
        double GetChi2() { return chi2_; }
        double GetNdof() { return Ndof_; }
        double GetSumEt() { return SumEt_; }
        int GetIdHadb() { return IdHadb_;}
        int GetIdWp() { return IdWp_; }
        int GetIdWq() { return IdWq_; }
        int GetIdLepb() { return IdLepb_;}
        void SetIdHadb(int id) { IdHadb_ = id;}
        void SetIdWp(int id) { IdWp_ = id; }
        void SetIdWq(int id) { IdWq_ = id; }
        void SetIdLepb(int id) { IdLepb_ = id;}
        void Print() {
          std::cout << " jet Wp  : px = " << Wp_.Px() << " py = " <<  Wp_.Py() << " pz = " << Wp_.Pz() << " e = " << Wp_.E() << std::endl;
          std::cout << " jet Wq  : px = " << Wq_.Px() << " py = " <<  Wq_.Py() << " pz = " << Wq_.Pz() << " e = "<< Wq_.E() << std::endl;
          std::cout << " jet Hadb: px = " << Hadb_.Px() << " py = " <<  Hadb_.Py() <<" pz = " << Hadb_.Pz() <<" e = "<< Hadb_.E() << std::endl;
          std::cout << " jet Lepb: px = " << Lepb_.Px() << " py = " <<  Lepb_.Py() <<" pz = " << Lepb_.Pz() <<" e = "<< Lepb_.E() << std::endl;
          std::cout << " chi-squared = " << chi2_ << " sumEt = " << SumEt_ << std::endl;
        }
        double getPdfValue(std::string flavor, double disc) {
          double pdf= 0;
          TH1F *hpdf;
          if ( flavor == "b" ) hpdf = hdisc_b_;
          else hpdf = hdisc_cl_;
          int bin = hpdf->GetXaxis()->FindBin( disc );
          pdf = hpdf->GetBinContent( bin );
          if ( disc < -10 || disc >50 ) return 0;
          //if ( pdf == 0 ) return 1.e-7;
          return pdf;
        }
        
  private:
        
        TLorentzVector Wp_;
        TLorentzVector Wq_;
        TLorentzVector HadW_;
        TLorentzVector Hadb_;
        TLorentzVector HadTop_;
        TLorentzVector LepW_;
        TLorentzVector Lepb_;   
        TLorentzVector LepTop_;
        TLorentzVector TopPair_;
        
        bool usebtag_;
        bool useMtop_;
        double Wp_disc_;
        double Wq_disc_;
        double Hadb_disc_;
        double Lepb_disc_;
        TFile *pdffile_;
        TH1F *hdisc_b_;
        TH1F *hdisc_cl_;

        double Wp_flv_, Wq_flv_, Hadb_flv_, Lepb_flv_;
        bool useFlv_;
        double chi2_;
        double Ndof_;
        double SumEt_;
        double minMassLepW_;
        double maxMassLepW_;
        double minMassHadW_;
        double maxMassHadW_;
        
        double minMassLepTop_;
        double maxMassLepTop_;

        double MW;
        double Mtop_h;
        double Mtop_l;
        double sigmaHadW;
        double sigmaHadt;
        double sigmaLept;


        int IdHadb_;
        int IdWp_;
        int IdWq_;
        int IdLepb_;
        
};

struct minChi2
{
  bool operator()(Combo s1, Combo s2) const
  {
    return s1.GetChi2() <= s2.GetChi2();
  }
};

struct maxSumEt
{
  bool operator()(Combo s1, Combo s2) const
  {
    return s1.GetSumEt() >= s2.GetSumEt();
  }
};


class JetCombinatorics {

  public:

        JetCombinatorics();
        ~JetCombinatorics();

        void Verbose() {
          verbosef = true;
        }

        std::map< int, std::string > Combinatorics(int k, int max = 6);
        std::map< int, std::string > NestedCombinatorics();

        void FourJetsCombinations(std::vector<TLorentzVector> jets, std::vector<double> bdiscriminators );
        void SetFlavorCorrections(std::vector<double > vector ) { flavorCorrections_ = vector; }
        void SetMaxNJets(int n) { maxNJets_ = n; }
        Combo GetCombination(int n=0);
        Combo GetCombinationSumEt(int n=0);
        int GetNumberOfCombos() { return ( (int)allCombos_.size() ); } 
        //void SetCandidate( std::vector< TLorentzVector > JetCandidates );

        void SetSigmas(int type = 0) {
          SigmasTypef = type;
        }
        void SetLeptonicW( TLorentzVector LepW ) { theLepW_ = LepW; }

        void SetMinMassLepW( double mass ) { minMassLepW_ = mass; }
        void SetMaxMassLepW( double mass ) { maxMassLepW_ = mass; }
        void SetMinMassHadW( double mass ) { minMassHadW_ = mass; }
        void SetMaxMassHadW( double mass ) { maxMassHadW_ = mass; }
        void SetMinMassLepTop( double mass ) { minMassLepTop_ = mass; }
        void SetMaxMassLepTop( double mass ) { maxMassLepTop_ = mass; }

        void UsebTagging( bool option = true ) { UsebTagging_ = option; }
        void ApplyFlavorCorrection( bool option = true ) { UseFlv_ = option; }
        void UseMtopConstraint( bool option = true) { UseMtop_ = option; }
        void SetbTagPdf( TString name ) { bTagPdffilename_ = name; }
        void Clear();

        std::vector< TLorentzVector > TwoCombos();
        std::vector< TLorentzVector > ThreeCombos();

        void RemoveDuplicates( bool option) { removeDuplicates_ = option; }

        std::vector< TLorentzVector > GetComposites();
        void AnalyzeCombos();


  private:

        //int kcombos_;
        //int maxcombos_;
        int SigmasTypef;
        bool verbosef;
        std::map< int, std::string > Template4jCombos_;
        std::map< int, std::string > Template5jCombos_;
        std::map< int, std::string > Template6jCombos_;
        std::map< int, std::string > Template7jCombos_;

        std::vector< double > flavorCorrections_;
        int maxNJets_;
        bool UsebTagging_;
        bool UseMtop_;
        TString bTagPdffilename_;
        bool UseFlv_;
        
        TLorentzVector theLepW_;

        double minMassLepW_;
        double maxMassLepW_;
        double minMassHadW_;
        double maxMassHadW_;
        double minMassLepTop_;
        double maxMassLepTop_;
        
        std::map< Combo, int, minChi2 > allCombos_;
        std::map< Combo, int, maxSumEt > allCombosSumEt_;

        Double_t minPhi_;
        double chi2_;
        int ndf_;
        bool removeDuplicates_;
        
        std::vector< TLorentzVector > cand1_;
        std::vector< TLorentzVector > cand2_;
        std::vector< TLorentzVector > cand3_;

        //int nLists_;
        
        //std::vector< TLorentzVector > composites_;
        
};

#endif