/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/HLTriggerOffline/Top/src/TopHLTDQMHelper.cc

Go to the documentation of this file.

#include "HLTriggerOffline/Top/interface/TopHLTDQMHelper.h"
#include <iostream>
/*Originally from DQM/Physics package, written by Roger Wolf and Jeremy Andrea*/

using namespace std;

CalculateHLT::CalculateHLT(int maxNJets, double wMass): 
  failed_(false), maxNJets_(maxNJets), wMass_(wMass), massWBoson_(-1.), massTopQuark_(-1.),tmassWBoson_(-1),tmassTopQuark_(-1),mlb_(-1)
{
}


double
CalculateHLT::massWBoson(const std::vector<reco::Jet>& jets)
{
  if(!failed_&& massWBoson_<0) operator()(jets); return massWBoson_;
}


double 
CalculateHLT::massTopQuark(const std::vector<reco::Jet>& jets) 
{ 
  if(!failed_&& massTopQuark_<0) operator()(jets); return massTopQuark_; 
}

/*
double 
Calculate::tmassWBoson(const T& mu, const reco::MET& met, const reco::Jet& b)
{
  if(!failed_&& tmassWBoson_<0) operator()(b,mu,met); return tmassWBoson_;
}


double
Calculate::masslb(const T& mu, const reco::MET& met, const reco::Jet& b)
{
  if(!failed_&& mlb_<0) operator()(b,mu,met); return mlb_;
}


double
Calculate::tmassTopQuark(const T& lepton, const reco::MET& met, const reco::Jet& b)
{
  if(!failed_&& tmassTopQuark_<0) operator()(b,lepton,met); return tmassTopQuark_;
}


void Calculate::operator()( const reco::Jet& bJet, const T& lepton, const reco::MET& met){
  reco::Particle::LorentzVector WT = lepton.p4() + met.p4();
  tmassWBoson_ = sqrt((WT.px()*WT.px()) + (WT.py()*WT.py()));   
  reco::Particle::LorentzVector topT = WT + bJet.p4();
  tmassTopQuark_ = sqrt((topT.px()*topT.px()) + (topT.py()*topT.py()));
  reco::Particle::LorentzVector lb = bJet.p4() + lepton.p4();  
  mlb_ = lb.mass();
}*/


double 
CalculateHLT::tmassWBoson(reco::RecoCandidate* mu, const reco::MET& met, const reco::Jet& b)
{
  if(!failed_&& tmassWBoson_<0) operator()(b,mu,met); return tmassWBoson_;
}


double
CalculateHLT::masslb(reco::RecoCandidate* mu, const reco::MET& met, const reco::Jet& b)
{
  if(!failed_&& mlb_<0) operator()(b,mu,met); return mlb_;
}


double
CalculateHLT::tmassTopQuark(reco::RecoCandidate* lepton, const reco::MET& met, const reco::Jet& b)
{
  if(!failed_&& tmassTopQuark_<0) operator()(b,lepton,met); return tmassTopQuark_;
}


void CalculateHLT::operator()( const reco::Jet& bJet, reco::RecoCandidate* lepton, const reco::MET& met){
  double metT = sqrt(pow(met.px(),2) + pow(met.py(),2));
  double lepT = sqrt(pow(lepton->px(),2) + pow(lepton->py(),2));
  double bT   = sqrt(pow(bJet.px(),2) + pow(bJet.py(),2));
  reco::Particle::LorentzVector WT = lepton->p4() + met.p4();
  cout<<"in calculate:\n\t"<<bJet.pt()<<"\t"<<lepton->pt()<<"\t"<<met.pt()<<endl;
  tmassWBoson_ = sqrt(pow(metT+lepT,2) - (WT.px()*WT.px()) - (WT.py()*WT.py()));        
  reco::Particle::LorentzVector topT = WT + bJet.p4();
  tmassTopQuark_ = sqrt(pow((metT+lepT+bT),2) - (topT.px()*topT.px()) - (topT.py()*topT.py()));
  reco::Particle::LorentzVector lb = bJet.p4() + lepton->p4();  
  mlb_ = lb.mass();
}


void
CalculateHLT::operator()(const std::vector<reco::Jet>& jets)
{
  
  if(maxNJets_<0) maxNJets_=jets.size();
  failed_= jets.size()<(unsigned int) maxNJets_;
  if( failed_){ return; }

  // associate those jets with maximum pt of the vectorial 
  // sum to the hadronic decay chain
  double maxPt=-1.;
  std::vector<int> maxPtIndices;
  maxPtIndices.push_back(-1);
  maxPtIndices.push_back(-1);
  maxPtIndices.push_back(-1);
  for(int idx=0; idx<maxNJets_; ++idx){
    for(int jdx=0; jdx<maxNJets_; ++jdx){ if(jdx<=idx) continue;
      for(int kdx=0; kdx<maxNJets_; ++kdx){ if(kdx==idx || kdx==jdx) continue;
        reco::Particle::LorentzVector sum = jets[idx].p4()+jets[jdx].p4()+jets[kdx].p4();
        if( maxPt<0. || maxPt<sum.pt() ){
          maxPt=sum.pt();
          maxPtIndices.clear();
          maxPtIndices.push_back(idx);
          maxPtIndices.push_back(jdx);
          maxPtIndices.push_back(kdx);
        }
      }
    }
  }
  massTopQuark_= (jets[maxPtIndices[0]].p4()+
                  jets[maxPtIndices[1]].p4()+
                  jets[maxPtIndices[2]].p4()).mass();

  // associate those jets that get closest to the W mass
  // with their invariant mass to the W boson
  double wDist =-1.;
  std::vector<int> wMassIndices;
  wMassIndices.push_back(-1);
  wMassIndices.push_back(-1);
  for(unsigned idx=0; idx<maxPtIndices.size(); ++idx){  
    for(unsigned jdx=0; jdx<maxPtIndices.size(); ++jdx){  
      if( jdx==idx || maxPtIndices[idx]>maxPtIndices[jdx] ) continue;
        reco::Particle::LorentzVector sum = jets[maxPtIndices[idx]].p4()+jets[maxPtIndices[jdx]].p4();
        if( wDist<0. || wDist>fabs(sum.mass()-wMass_) ){
          wDist=fabs(sum.mass()-wMass_);
          wMassIndices.clear();
          wMassIndices.push_back(maxPtIndices[idx]);
          wMassIndices.push_back(maxPtIndices[jdx]);
        }
    }
  }
  massWBoson_= (jets[wMassIndices[0]].p4()+
                jets[wMassIndices[1]].p4()).mass();
}