#include <ReclusterJets.h>

Public Types
typedef math::XYZTLorentzVector	LorentzVector

Public Member Functions
std::vector< LorentzVector >	getGrouping (double ptMin=0.0)
	get grouping (inclusive jets) More...

std::vector< LorentzVector >	getGroupingExclusive (int njets)
	get grouping (exclusive jets, until n are left) More...

std::vector< LorentzVector >	getGroupingExclusive (double dcut)
	get grouping (exclusive jets, up to cut dcut) More...

LorentzVector	getPruned (double zcut, double rcutFactor)
	get pruned 4-vector More...

LorentzVector	getPrunedSubjetExclusive (unsigned int isubjet, double zcut, double rcutFactor)
	get pruned 4-vector for a given subject (must be called after getGroupingExclusive) More...

LorentzVector	getPrunedSubjetInclusive (unsigned int isubjet, double zcut, double rcutFactor)
	get pruned 4-vector for a given subject (must be called after getGroupingInclusive) More...

	ReclusterJets (const std::vector< LorentzVector > &objects, double ktpower, double rparam)

Private Types
typedef std::shared_ptr < fastjet::ClusterSequence >	ClusterSequencePtr
	fastjet outputs More...

Private Member Functions
LorentzVector	getPruned (const fastjet::PseudoJet &jet, double zcut, double rcutFactor)

std::vector< LorentzVector >	makeP4s (const std::vector< fastjet::PseudoJet > &jets)

Private Attributes
std::vector< fastjet::PseudoJet >	exclusiveJets_

ClusterSequencePtr	fjClusterSeq_

std::vector< fastjet::PseudoJet >	fjInputs_

std::vector< fastjet::PseudoJet >	inclusiveJets_

double	ktpower_

double	rparam_

Detailed Description

Definition at line 19 of file ReclusterJets.h.

Member Typedef Documentation

typedef std::shared_ptr<fastjet::ClusterSequence> heppy::ReclusterJets::ClusterSequencePtr

private

fastjet outputs

Definition at line 57 of file ReclusterJets.h.

typedef math::XYZTLorentzVector heppy::ReclusterJets::LorentzVector

Definition at line 21 of file ReclusterJets.h.

Constructor & Destructor Documentation

heppy::ReclusterJets::ReclusterJets	(	const std::vector< LorentzVector > &	objects,
		double	ktpower,
		double	rparam
	)

Definition at line 14 of file ReclusterJets.cc.

References Exception, fjClusterSeq_, fjInputs_, dqmiolumiharvest::j, fwrapper::jet_def, ktpower_, class-composition::o, and rparam_.

       : ktpower_(ktpower), rparam_(rparam) {
     // define jet inputs
     fjInputs_.clear();
     int index = 0;
     for (const LorentzVector &o : objects) {
       fastjet::PseudoJet j(o.Px(), o.Py(), o.Pz(), o.E());
       j.set_user_index(index);
       index++;  // in case we want to know which piece ended where
       fjInputs_.push_back(j);
     }
 
     // choose a jet definition
     fastjet::JetDefinition jet_def;
 
     // prepare jet def
     if (ktpower_ == 1.0) {
       jet_def = JetDefinition(kt_algorithm, rparam_);
     } else if (ktpower_ == 0.0) {
       jet_def = JetDefinition(cambridge_algorithm, rparam_);
     } else if (ktpower_ == -1.0) {
       jet_def = JetDefinition(antikt_algorithm, rparam_);
     } else {
       throw cms::Exception("InvalidArgument", "Unsupported ktpower value");
     }
 
     // print out some infos
     //  cout << "Clustering with " << jet_def.description() << endl;
     // define jet clustering sequence
     fjClusterSeq_ = std::make_shared<fastjet::ClusterSequence>(fjInputs_, jet_def);
   }

Member Function Documentation

std::vector< math::XYZTLorentzVector > heppy::ReclusterJets::getGrouping ( double ptMin = 0.0 )

get grouping (inclusive jets)

Definition at line 55 of file ReclusterJets.cc.

References fjClusterSeq_, inclusiveJets_, and makeP4s().

                                                                           {
     // recluster jet
     inclusiveJets_ = fastjet::sorted_by_pt(fjClusterSeq_->inclusive_jets(ptMin));
     // return
     return makeP4s(inclusiveJets_);
   }

std::vector< math::XYZTLorentzVector > heppy::ReclusterJets::getGroupingExclusive ( int njets )

get grouping (exclusive jets, until n are left)

Definition at line 69 of file ReclusterJets.cc.

References exclusiveJets_, fjClusterSeq_, and makeP4s().

                                                                                 {
     // recluster jet
     exclusiveJets_ = fastjet::sorted_by_pt(fjClusterSeq_->exclusive_jets(njets));
     // return
     return makeP4s(exclusiveJets_);
   }

std::vector< math::XYZTLorentzVector > heppy::ReclusterJets::getGroupingExclusive ( double dcut )

get grouping (exclusive jets, up to cut dcut)

Definition at line 62 of file ReclusterJets.cc.

References exclusiveJets_, fjClusterSeq_, and makeP4s().

                                                                                   {
     // recluster jet
     exclusiveJets_ = fastjet::sorted_by_pt(fjClusterSeq_->exclusive_jets(dcut));
     // return
     return makeP4s(exclusiveJets_);
   }

math::XYZTLorentzVector heppy::ReclusterJets::getPruned	(	double	zcut,
		double	rcutFactor
	)

get pruned 4-vector

Definition at line 76 of file ReclusterJets.cc.

References exclusiveJets_, fjClusterSeq_, and getPrunedSubjetExclusive().

Referenced by getPrunedSubjetExclusive(), and getPrunedSubjetInclusive().

                                                                                {
     // cluster everything first
     exclusiveJets_ = fastjet::sorted_by_pt(fjClusterSeq_->exclusive_jets(1));
     // get pruned exclusive
     return getPrunedSubjetExclusive(0, zcut, rcutFactor);
   }

math::XYZTLorentzVector heppy::ReclusterJets::getPruned	(	const fastjet::PseudoJet &	jet,
		double	zcut,
		double	rcutFactor
	)

private

Definition at line 100 of file ReclusterJets.cc.

                                                                                                             {
     // create pruner
     fastjet::Pruner pruner(fastjet::cambridge_algorithm, zcut, rcutFactor);
     // Prune the jet
     fastjet::PseudoJet pruned_jet = pruner(jet);
     return LorentzVector(pruned_jet.px(), pruned_jet.py(), pruned_jet.pz(), pruned_jet.e());
   }

math::XYZTLorentzVector heppy::ReclusterJets::getPrunedSubjetExclusive	(	unsigned int	isubjet,
		double	zcut,
		double	rcutFactor
	)

get pruned 4-vector for a given subject (must be called after getGroupingExclusive)

Definition at line 83 of file ReclusterJets.cc.

References Exception, exclusiveJets_, and getPruned().

Referenced by getPruned().

                                                                                      {
     if (isubjet >= exclusiveJets_.size()) {
       throw cms::Exception("InvalidArgument", "getPrunedSubjetExclusive called for non-existing exclusive subjet");
     }
     return getPruned(exclusiveJets_[isubjet], zcut, rcutFactor);
   }

math::XYZTLorentzVector heppy::ReclusterJets::getPrunedSubjetInclusive	(	unsigned int	isubjet,
		double	zcut,
		double	rcutFactor
	)

get pruned 4-vector for a given subject (must be called after getGroupingInclusive)

Definition at line 91 of file ReclusterJets.cc.

References Exception, getPruned(), and inclusiveJets_.

                                                                                      {
     if (isubjet >= inclusiveJets_.size()) {
       throw cms::Exception("InvalidArgument", "getPrunedSubjetInclusive called for non-existing inclusive subjet");
     }
     return getPruned(inclusiveJets_[isubjet], zcut, rcutFactor);
   }

std::vector< math::XYZTLorentzVector > heppy::ReclusterJets::makeP4s ( const std::vector< fastjet::PseudoJet > & jets )

private

Definition at line 47 of file ReclusterJets.cc.

Referenced by getGrouping(), and getGroupingExclusive().

                                                                                                  {
     std::vector<math::XYZTLorentzVector> JetObjectsAll;
     JetObjectsAll.reserve(jets.size());
     for (const fastjet::PseudoJet &pj : jets) {
       JetObjectsAll.push_back(LorentzVector(pj.px(), pj.py(), pj.pz(), pj.e()));
     }
     return JetObjectsAll;
   }