Calculate Class Reference

Helper class for the calculation of a top and a W boson mass estime. More...

#include "DQM/Physics/interface/TopDQMHelpers.h"

Public Member Functions
	Calculate (int maxNJets, double wMass)
	default constructor More...
double	massBTopQuark (const std::vector< reco::Jet > &jets, std::vector< double > VbtagWP, double btagWP_)
	calculate b-tagged t-quark mass estimate More...
double	massTopQuark (const std::vector< reco::Jet > &jets)
	calculate t-quark mass estimate More...
double	massWBoson (const std::vector< reco::Jet > &jets)
	calculate W boson mass estimate More...
double	tmassTopQuark (reco::RecoCandidate *lep, const reco::MET &met, const reco::Jet &b)
	calculate top quark transverse mass estimate More...
double	tmassWBoson (reco::RecoCandidate *lep, const reco::MET &met, const reco::Jet &b)
	calculate W boson transverse mass estimate More...
	~Calculate ()
	default destructor More...

Private Member Functions
void	operator() (const std::vector< reco::Jet > &jets)
void	operator() (const reco::Jet &bJet, reco::RecoCandidate *lepton, const reco::MET &met)
	do the calculation of the transverse top and W masses More...
void	operator2 (const std::vector< reco::Jet > &, std::vector< double >, double)
	do the calculation of the t-quark mass with one b-jet More...

Private Attributes
bool	failed_
	indicate failed associations More...
double	massBTopQuark_
	cache of b-tagged top quark mass estimate More...
double	massTopQuark_
	cache of top quark mass estimate More...
double	massWBoson_
	cache of w boson mass estimate More...
int	maxNJets_
	max. number of jets to be considered More...
double	tmassTopQuark_
	cache of top quark transverse mass estimate More...
double	tmassWBoson_
	cache of W boson transverse mass estimate More...
double	wMass_
	paramater of the w boson mass More...

Detailed Description

Helper class for the calculation of a top and a W boson mass estime.

Helper class for the calculation of a top and a W boson mass estimate. The core implementation originates from the plugin TtSemiLepHypMaxSumPtWMass in TopQuarkAnalysis/TopJetCombination package. It may be extended to include b tag information.

Definition at line 67 of file TopDQMHelpers.h.

Constructor & Destructor Documentation

Calculate::Calculate	(	int	maxNJets,
		double	wMass
	)

default constructor

Definition at line 3 of file TopDQMHelpers.cc.

    : failed_(false),
      maxNJets_(maxNJets),
      wMass_(wMass),
      massWBoson_(-1.),
      massTopQuark_(-1.),
      massBTopQuark_(-1.),
      tmassWBoson_(-1),
      tmassTopQuark_(-1) {}

Calculate::~Calculate ( )

inline

default destructor

Definition at line 72 of file TopDQMHelpers.h.

{};

Member Function Documentation

double Calculate::massBTopQuark	(	const std::vector< reco::Jet > &	jets,
		std::vector< double >	VbtagWP,
		double	btagWP_
	)

calculate b-tagged t-quark mass estimate

Definition at line 23 of file TopDQMHelpers.cc.

References failed_, massBTopQuark_, and operator2().

Referenced by TopSingleLepton::MonitorEnsemble::fill().

                                                                           {
  if (!failed_ && massBTopQuark_ < 0) operator2(jets, VbtagWP, btagWP_);
  return massBTopQuark_;
}

double Calculate::massTopQuark

(

const std::vector< reco::Jet > &

jets

)

calculate t-quark mass estimate

Definition at line 18 of file TopDQMHelpers.cc.

References failed_, massTopQuark_, and operator()().

Referenced by TopSingleLepton::MonitorEnsemble::fill(), and SingleTopTChannelLepton::MonitorEnsemble::fill().

                                                             {
  if (!failed_ && massTopQuark_ < 0) operator()(jets);
  return massTopQuark_;
}

double Calculate::massWBoson

(

const std::vector< reco::Jet > &

jets

)

calculate W boson mass estimate

Definition at line 13 of file TopDQMHelpers.cc.

References failed_, massWBoson_, and operator()().

Referenced by TopSingleLepton::MonitorEnsemble::fill(), and SingleTopTChannelLepton::MonitorEnsemble::fill().

                                                           {
  if (!failed_ && massWBoson_ < 0) operator()(jets);
  return massWBoson_;
}

void Calculate::operator() ( const std::vector< reco::Jet > &  jets )

private

do the calculation; this is called only once per event by the first function call to return a mass estimate. The once calculated values are cached afterwards

Definition at line 54 of file TopDQMHelpers.cc.

References failed_, customizeTrackingMonitorSeedNumber::idx, massTopQuark_, massWBoson_, maxNJets_, and wMass_.

Referenced by massTopQuark(), massWBoson(), tmassTopQuark(), and tmassWBoson().

                                                         {
  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();
}

void Calculate::operator() ( const reco::Jet &  bJet, reco::RecoCandidate *  lepton, const reco::MET &  met  )

private

do the calculation of the transverse top and W masses

Definition at line 41 of file TopDQMHelpers.cc.

References reco::LeafCandidate::p4(), funct::pow(), reco::LeafCandidate::px(), reco::LeafCandidate::py(), mathSSE::sqrt(), tmassTopQuark_, and tmassWBoson_.

                                               {
  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();
  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()));
}

void Calculate::operator2 ( const std::vector< reco::Jet > &  jets, std::vector< double >  bjet, double  btagWP  )

private

do the calculation of the t-quark mass with one b-jet

Definition at line 112 of file TopDQMHelpers.cc.

References failed_, customizeTrackingMonitorSeedNumber::idx, massBTopQuark_, and maxNJets_.

Referenced by massBTopQuark().

                                                                 {
  if (maxNJets_ < 0) maxNJets_ = jets.size();
  failed_ = jets.size() < (unsigned int)maxNJets_;
  if (failed_) {
    return;
  }
  if (jets.size() != bjet.size()) {
    return;
  }

  // associate those jets with maximum pt of the vectorial
  // sum to the hadronic decay chain. Require ONLY 1 btagged jet
  double maxBPt = -1.;
  std::vector<int> maxBPtIndices;
  maxBPtIndices.push_back(-1);
  maxBPtIndices.push_back(-1);
  maxBPtIndices.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;
        // require only 1b-jet
        if ((bjet[idx] > btagWP && bjet[jdx] <= btagWP &&
             bjet[kdx] <= btagWP) ||
            (bjet[idx] <= btagWP && bjet[jdx] > btagWP &&
             bjet[kdx] <= btagWP) ||
            (bjet[idx] <= btagWP && bjet[jdx] <= btagWP &&
             bjet[kdx] > btagWP)) {
          reco::Particle::LorentzVector sum =
              jets[idx].p4() + jets[jdx].p4() + jets[kdx].p4();
          if (maxBPt < 0. || maxBPt < sum.pt()) {
            maxBPt = sum.pt();
            maxBPtIndices.clear();
            maxBPtIndices.push_back(idx);
            maxBPtIndices.push_back(jdx);
            maxBPtIndices.push_back(kdx);
          }
        }
      }
    }
  }
  if (maxBPtIndices[0] < 0 || maxBPtIndices[1] < 0 || maxBPtIndices[2] < 0)
    return;
  massBTopQuark_ = (jets[maxBPtIndices[0]].p4() + jets[maxBPtIndices[1]].p4() +
                    jets[maxBPtIndices[2]].p4()).mass();
}

double Calculate::tmassTopQuark	(	reco::RecoCandidate *	lep,
		const reco::MET &	met,
		const reco::Jet &	b
	)

calculate top quark transverse mass estimate

Definition at line 35 of file TopDQMHelpers.cc.

References operator()(), and tmassTopQuark_.

Referenced by SingleTopTChannelLepton::MonitorEnsemble::fill().

                                                                      {
  if (tmassTopQuark_ < 0) operator()(b, lepton, met);
  return tmassTopQuark_;
}

double Calculate::tmassWBoson	(	reco::RecoCandidate *	lep,
		const reco::MET &	met,
		const reco::Jet &	b
	)

calculate W boson transverse mass estimate

Definition at line 29 of file TopDQMHelpers.cc.

References operator()(), and tmassWBoson_.

Referenced by SingleTopTChannelLepton::MonitorEnsemble::fill().

                                                {
  if (tmassWBoson_ < 0) operator()(b, mu, met);
  return tmassWBoson_;
}

Member Data Documentation

bool Calculate::failed_

private

indicate failed associations

Definition at line 104 of file TopDQMHelpers.h.

Referenced by massBTopQuark(), massTopQuark(), massWBoson(), operator()(), and operator2().

double Calculate::massBTopQuark_

private

cache of b-tagged top quark mass estimate

Definition at line 114 of file TopDQMHelpers.h.

Referenced by massBTopQuark(), and operator2().

double Calculate::massTopQuark_

private

cache of top quark mass estimate

Definition at line 112 of file TopDQMHelpers.h.

Referenced by massTopQuark(), and operator()().

double Calculate::massWBoson_

private

cache of w boson mass estimate

Definition at line 110 of file TopDQMHelpers.h.

Referenced by massWBoson(), and operator()().

int Calculate::maxNJets_

private

max. number of jets to be considered

Definition at line 106 of file TopDQMHelpers.h.

Referenced by operator()(), and operator2().

double Calculate::tmassTopQuark_

private

cache of top quark transverse mass estimate

Definition at line 118 of file TopDQMHelpers.h.

Referenced by operator()(), and tmassTopQuark().

double Calculate::tmassWBoson_

private

cache of W boson transverse mass estimate

Definition at line 116 of file TopDQMHelpers.h.

Referenced by operator()(), and tmassWBoson().

double Calculate::wMass_

private

paramater of the w boson mass

Definition at line 108 of file TopDQMHelpers.h.

Referenced by operator()().