#include <PileUpSubtractor.h>

Inheritance diagram for PileUpSubtractor:

Public Types
typedef boost::shared_ptr< fastjet::GhostedAreaSpec >	ActiveAreaSpecPtr

typedef boost::shared_ptr< fastjet::ClusterSequence >	ClusterSequencePtr

typedef boost::shared_ptr< fastjet::JetDefinition >	JetDefPtr

typedef boost::shared_ptr< fastjet::RangeDefinition >	RangeDefPtr

Public Member Functions
virtual void	calculateOrphanInput (std::vector< fastjet::PseudoJet > &orphanInput)

virtual void	calculatePedestal (std::vector< fastjet::PseudoJet > const &coll)

virtual double	getCone (double cone, double eta, double phi, double &et, double &pu)

virtual double	getMeanAtTower (const reco::CandidatePtr &in) const

int	getN (const reco::CandidatePtr &in) const

int	getNwithJets (const reco::CandidatePtr &in) const

virtual double	getPileUpAtTower (const reco::CandidatePtr &in) const

virtual double	getPileUpEnergy (int ijet) const

virtual double	getSigmaAtTower (const reco::CandidatePtr &in) const

int	ieta (const reco::CandidatePtr &in) const

int	iphi (const reco::CandidatePtr &in) const

virtual void	offsetCorrectJets ()

	PileUpSubtractor (const edm::ParameterSet &iConfig, edm::ConsumesCollector &&iC)

virtual void	reset (std::vector< edm::Ptr< reco::Candidate > > &input, std::vector< fastjet::PseudoJet > &towers, std::vector< fastjet::PseudoJet > &output)

virtual void	setDefinition (JetDefPtr const &jetDef)

virtual void	setupGeometryMap (edm::Event &iEvent, const edm::EventSetup &iSetup)

virtual void	subtractPedestal (std::vector< fastjet::PseudoJet > &coll)

virtual	~PileUpSubtractor ()

Protected Attributes
std::vector< HcalDetId >	allgeomid_

bool	doAreaFastjet_

bool	doRhoFastjet_

std::map< int, double >	emean_

std::map< int, double >	esigma_

ActiveAreaSpecPtr	fjActiveArea_

ClusterSequencePtr	fjClusterSeq_

std::vector< fastjet::PseudoJet > *	fjInputs_

JetDefPtr	fjJetDefinition_

std::vector< fastjet::PseudoJet > *	fjJets_

std::vector< fastjet::PseudoJet >	fjOriginalInputs_

RangeDefPtr	fjRangeDef_

CaloGeometry const *	geo_

std::map< int, int >	geomtowers_

int	ietamax_

int	ietamin_

std::vector< edm::Ptr< reco::Candidate > > *	inputs_

std::vector< double >	jetOffset_

double	jetPtMin_

double	nSigmaPU_

std::map< int, int >	ntowersWithJets_

double	puPtMin_

double	radiusPU_

bool	reRunAlgo_

Detailed Description

Definition at line 21 of file PileUpSubtractor.h.

Member Typedef Documentation

typedef boost::shared_ptr<fastjet::GhostedAreaSpec> PileUpSubtractor::ActiveAreaSpecPtr

Definition at line 26 of file PileUpSubtractor.h.

typedef boost::shared_ptr<fastjet::ClusterSequence> PileUpSubtractor::ClusterSequencePtr

Definition at line 25 of file PileUpSubtractor.h.

typedef boost::shared_ptr<fastjet::JetDefinition> PileUpSubtractor::JetDefPtr

Definition at line 28 of file PileUpSubtractor.h.

typedef boost::shared_ptr<fastjet::RangeDefinition> PileUpSubtractor::RangeDefPtr

Definition at line 27 of file PileUpSubtractor.h.

Constructor & Destructor Documentation

PileUpSubtractor::PileUpSubtractor	(	const edm::ParameterSet &	iConfig,
		edm::ConsumesCollector &&	iC
	)

Definition at line 18 of file PileUpSubtractor.cc.

References doAreaFastjet_, doRhoFastjet_, edm::ParameterSet::exists(), fjActiveArea_, fjRangeDef_, edm::ParameterSet::getParameter(), and puPtMin_.

                                                                                              :
   reRunAlgo_ (iConfig.getUntrackedParameter<bool>("reRunAlgo",false)),
   doAreaFastjet_ (iConfig.getParameter<bool>         ("doAreaFastjet")),
   doRhoFastjet_  (iConfig.getParameter<bool>         ("doRhoFastjet")),
   jetPtMin_(iConfig.getParameter<double>       ("jetPtMin")),
   nSigmaPU_(iConfig.getParameter<double>("nSigmaPU")),
   radiusPU_(iConfig.getParameter<double>("radiusPU")),
   geo_(0)
 {
   if (iConfig.exists("puPtMin"))
     puPtMin_=iConfig.getParameter<double>       ("puPtMin");
   else{
     puPtMin_=10;
     edm::LogWarning("MisConfiguration")<<"the parameter puPtMin is now necessary for PU substraction. setting it to "<<puPtMin_;
   }
    if ( doAreaFastjet_ || doRhoFastjet_ ) {
       // default Ghost_EtaMax should be 5
       double ghostEtaMax = iConfig.getParameter<double>("Ghost_EtaMax");
       // default Active_Area_Repeats 1
       int    activeAreaRepeats = iConfig.getParameter<int> ("Active_Area_Repeats");
       // default GhostArea 0.01
       double ghostArea = iConfig.getParameter<double> ("GhostArea");
       fjActiveArea_ =  ActiveAreaSpecPtr(new fastjet::ActiveAreaSpec(ghostEtaMax,
                                          activeAreaRepeats,
                                          ghostArea));
       fjRangeDef_ = RangeDefPtr( new fastjet::RangeDefinition(ghostEtaMax) );
    } 
 }

virtual PileUpSubtractor::~PileUpSubtractor ( )

inlinevirtual

Definition at line 31 of file PileUpSubtractor.h.

References calculateOrphanInput(), calculatePedestal(), coll, getMeanAtTower(), getPileUpAtTower(), getSigmaAtTower(), iEvent, recoMuon::in, input, offsetCorrectJets(), convertSQLitetoXML_cfg::output, reset(), setDefinition(), setupGeometryMap(), and subtractPedestal().

31 {;}

Member Function Documentation

void PileUpSubtractor::calculateOrphanInput ( std::vector< fastjet::PseudoJet > & orphanInput )

virtual

Reimplemented in ParametrizedSubtractor, and VoronoiSubtractor.

Definition at line 205 of file PileUpSubtractor.cc.

References allgeomid_, reco::deltaR(), runTauDisplay::dr, spr::find(), fjInputs_, fjJets_, fjOriginalInputs_, geo_, CaloGeometry::getPosition(), ieta(), diffTreeTool::index, inputs_, iphi(), LogDebug, ntowersWithJets_, puPtMin_, and radiusPU_.

Referenced by ~PileUpSubtractor().

 {
 
   LogDebug("PileUpSubtractor")<<"The subtractor calculating orphan input...\n";
 
   (*fjInputs_) = fjOriginalInputs_;
 
   vector<int> jettowers; // vector of towers indexed by "user_index"
   vector<pair<int,int> >  excludedTowers; // vector of excluded ieta, iphi values
 
   vector <fastjet::PseudoJet>::iterator pseudojetTMP = fjJets_->begin (),
     fjJetsEnd = fjJets_->end();
   for (; pseudojetTMP != fjJetsEnd ; ++pseudojetTMP) {
     if(pseudojetTMP->perp() < puPtMin_) continue;
 
     // find towers within radiusPU_ of this jet
     for(vector<HcalDetId>::const_iterator im = allgeomid_.begin(); im != allgeomid_.end(); im++)
       {
     double dr = reco::deltaR(geo_->getPosition((DetId)(*im)),(*pseudojetTMP));
     vector<pair<int,int> >::const_iterator exclude = find(excludedTowers.begin(),excludedTowers.end(),pair<int,int>(im->ieta(),im->iphi()));
     if( dr < radiusPU_ && exclude == excludedTowers.end()) {
       ntowersWithJets_[(*im).ieta()]++;     
       excludedTowers.push_back(pair<int,int>(im->ieta(),im->iphi()));
     }
       }
     vector<fastjet::PseudoJet>::const_iterator it = fjInputs_->begin(),
       fjInputsEnd = fjInputs_->end();
       
     for (; it != fjInputsEnd; ++it ) {
       int index = it->user_index();
       int ie = ieta((*inputs_)[index]);
       int ip = iphi((*inputs_)[index]);
       vector<pair<int,int> >::const_iterator exclude = find(excludedTowers.begin(),excludedTowers.end(),pair<int,int>(ie,ip));
       if(exclude != excludedTowers.end()) {
     jettowers.push_back(index);
       } //dr < radiusPU_
     } // initial input collection  
   } // pseudojets
   
   //
   // Create a new collections from the towers not included in jets 
   //
   for(vector<fastjet::PseudoJet>::const_iterator it = fjInputs_->begin(),
     fjInputsEnd = fjInputs_->end(); it != fjInputsEnd; ++it ) {
     int index = it->user_index();
     vector<int>::const_iterator itjet = find(jettowers.begin(),jettowers.end(),index);
     if( itjet == jettowers.end() ){
       const reco::CandidatePtr& originalTower = (*inputs_)[index];
       fastjet::PseudoJet orphan(originalTower->px(),originalTower->py(),originalTower->pz(),originalTower->energy());
       orphan.set_user_index(index);
 
       orphanInput.push_back(orphan); 
     }
   }
 }

void PileUpSubtractor::calculatePedestal ( std::vector< fastjet::PseudoJet > const & coll )

virtual

Reimplemented in ParametrizedSubtractor, MultipleAlgoIterator, ReflectedIterator, and VoronoiSubtractor.

Definition at line 107 of file PileUpSubtractor.cc.

References reco::e1, reco::e2, emean_, esigma_, geomtowers_, mps_fire::i, ieta(), ietamax_, ietamin_, LogDebug, nSigmaPU_, nt, ntowersWithJets_, edm::second(), and mathSSE::sqrt().

Referenced by ~PileUpSubtractor().

 {
   LogDebug("PileUpSubtractor")<<"The subtractor calculating pedestals...\n";
   map<int,double> emean2;
   map<int,int> ntowers;
     
   int ietaold = -10000;
   int ieta0 = -100;
    
   // Initial values for emean_, emean2, esigma_, ntowers
 
   for(int i = ietamin_; i < ietamax_+1; i++)
     {
       emean_[i] = 0.;
       emean2[i] = 0.;
       esigma_[i] = 0.;
       ntowers[i] = 0;
     }
     
   for (vector<fastjet::PseudoJet>::const_iterator input_object = coll.begin (),
      fjInputsEnd = coll.end();  
        input_object != fjInputsEnd; ++input_object) {
      const reco::CandidatePtr & originalTower=(*inputs_)[ input_object->user_index()];
     ieta0 = ieta( originalTower );
     double Original_Et = originalTower->et();
   if( ieta0-ietaold != 0 )
       {
         emean_[ieta0] = emean_[ieta0]+Original_Et;
         emean2[ieta0] = emean2[ieta0]+Original_Et*Original_Et;
         ntowers[ieta0] = 1;
         ietaold = ieta0;
       }
   else
       {
         emean_[ieta0] = emean_[ieta0]+Original_Et;
         emean2[ieta0] = emean2[ieta0]+Original_Et*Original_Et;
         ntowers[ieta0]++;
       }
   }
 
   for(map<int,int>::const_iterator gt = geomtowers_.begin(); gt != geomtowers_.end(); gt++)    
     {
       int it = (*gt).first;
        
       double e1 = (*(emean_.find(it))).second;
       double e2 = (*emean2.find(it)).second;
       int nt = (*gt).second - (*(ntowersWithJets_.find(it))).second;
 
       LogDebug("PileUpSubtractor")<<" ieta : "<<it<<" number of towers : "<<nt<<" e1 : "<<e1<<" e2 : "<<e2<<"\n";
       if(nt > 0) {
     emean_[it] = e1/nt;
     double eee = e2/nt - e1*e1/(nt*nt);    
     if(eee<0.) eee = 0.;
     esigma_[it] = nSigmaPU_*sqrt(eee);
       }
       else
     {
           emean_[it] = 0.;
           esigma_[it] = 0.;
     }
       LogDebug("PileUpSubtractor")<<" ieta : "<<it<<" Pedestals : "<<emean_[it]<<"  "<<esigma_[it]<<"\n";
     }
 }

double PileUpSubtractor::getCone	(	double	cone,
		double	eta,
		double	phi,
		double &	et,
		double &	pu
	)

virtual

Definition at line 308 of file PileUpSubtractor.cc.

References allgeomid_, reco::deltaR(), runTauDisplay::dr, emean_, esigma_, stringResolutionProvider_cfi::eta, PV3DBase< T, PVType, FrameType >::eta(), geo_, CaloGeometry::getPosition(), phi, PV3DBase< T, PVType, FrameType >::phi(), point, and muons2muons_cfi::pu.

Referenced by getPileUpEnergy().

                                                                                            {
   pu = 0;
   
   for(vector<HcalDetId>::const_iterator im = allgeomid_.begin(); im != allgeomid_.end(); im++){
      if( im->depth() != 1 ) continue;    
     const GlobalPoint& point = geo_->getPosition((DetId)(*im));
     double dr = reco::deltaR(point.eta(),point.phi(),eta,phi);      
     if( dr < cone){
       pu += (*emean_.find(im->ieta())).second+(*esigma_.find(im->ieta())).second;
     }
   }
   
   return pu;
 }

double PileUpSubtractor::getMeanAtTower ( const reco::CandidatePtr & in ) const

virtual

Reimplemented in ParametrizedSubtractor.

Definition at line 323 of file PileUpSubtractor.cc.

References emean_, ieta(), and edm::second().

Referenced by ~PileUpSubtractor().

                                                                         {
   int it = ieta(in);
   return (*emean_.find(it)).second;
 }

int PileUpSubtractor::getN ( const reco::CandidatePtr & in ) const

Definition at line 338 of file PileUpSubtractor.cc.

References geomtowers_, ieta(), gen::n, and ntowersWithJets_.

Referenced by getPileUpEnergy().

                                                             {
    int it = ieta(in);
    
    int n = (*(geomtowers_.find(it))).second - (*(ntowersWithJets_.find(it))).second;
    return n;
 
 }

int PileUpSubtractor::getNwithJets ( const reco::CandidatePtr & in ) const

Definition at line 346 of file PileUpSubtractor.cc.

References ieta(), gen::n, and ntowersWithJets_.

Referenced by getPileUpEnergy().

                                                                     {
    int it = ieta(in);
    int n = (*(ntowersWithJets_.find(it))).second;
    return n;
 
 }

double PileUpSubtractor::getPileUpAtTower ( const reco::CandidatePtr & in ) const

virtual

Reimplemented in ParametrizedSubtractor.

Definition at line 333 of file PileUpSubtractor.cc.

References emean_, esigma_, ieta(), and edm::second().

Referenced by ~PileUpSubtractor().

                                                                            {
   int it = ieta(in);
   return (*emean_.find(it)).second + (*esigma_.find(it)).second;
 }

virtual double PileUpSubtractor::getPileUpEnergy ( int ijet ) const

inlinevirtual

Definition at line 45 of file PileUpSubtractor.h.

References stringResolutionProvider_cfi::et, stringResolutionProvider_cfi::eta, getCone(), getN(), getNwithJets(), ieta(), iphi(), jetOffset_, phi, and muons2muons_cfi::pu.

45 {return jetOffset_[ijet];}

PileUpSubtractor::jetOffset_

std::vector< double > jetOffset_

Definition: PileUpSubtractor.h:84

double PileUpSubtractor::getSigmaAtTower ( const reco::CandidatePtr & in ) const

virtual

Reimplemented in ParametrizedSubtractor.

Definition at line 328 of file PileUpSubtractor.cc.

References esigma_, ieta(), and edm::second().

Referenced by ~PileUpSubtractor().

                                                                           {
    int it = ieta(in);
    return (*esigma_.find(it)).second;
 }

int PileUpSubtractor::ieta ( const reco::CandidatePtr & in ) const

Definition at line 354 of file PileUpSubtractor.cc.

References Exception, edm::Ptr< T >::get(), CaloTower::id(), and CaloTowerDetId::ieta().

Referenced by calculateOrphanInput(), calculatePedestal(), ParametrizedSubtractor::getMeanAtTower(), getMeanAtTower(), getN(), getNwithJets(), ParametrizedSubtractor::getPileUpAtTower(), getPileUpAtTower(), getPileUpEnergy(), ParametrizedSubtractor::getSigmaAtTower(), getSigmaAtTower(), ParametrizedSubtractor::offsetCorrectJets(), offsetCorrectJets(), ParametrizedSubtractor::setupGeometryMap(), setupGeometryMap(), ParametrizedSubtractor::subtractPedestal(), and subtractPedestal().

                                                             {
   int it = 0;
   const CaloTower* ctc = dynamic_cast<const CaloTower*>(in.get());
   if(ctc){
     it = ctc->id().ieta();
   } else
     {
       throw cms::Exception("Invalid Constituent") << "CaloJet constituent is not of CaloTower type";
     }
   return it;
 }

int PileUpSubtractor::iphi ( const reco::CandidatePtr & in ) const

Definition at line 366 of file PileUpSubtractor.cc.

References Exception, edm::Ptr< T >::get(), CaloTower::id(), and CaloTowerDetId::iphi().

Referenced by calculateOrphanInput(), getPileUpEnergy(), and ParametrizedSubtractor::subtractPedestal().

                                                             {
   int it = 0;
   const CaloTower* ctc = dynamic_cast<const CaloTower*>(in.get());
   if(ctc){
     it = ctc->id().iphi();
   } else
     {
       throw cms::Exception("Invalid Constituent") << "CaloJet constituent is not of CaloTower type";
     }
   return it;
 }

void PileUpSubtractor::offsetCorrectJets ( )

virtual

Reimplemented in ParametrizedSubtractor, VoronoiSubtractor, MultipleAlgoIterator, and ReflectedIterator.

Definition at line 262 of file PileUpSubtractor.cc.

References emean_, esigma_, fjJets_, ieta(), jetOffset_, LogDebug, and edm::second().

Referenced by ~PileUpSubtractor().

 {
   LogDebug("PileUpSubtractor")<<"The subtractor correcting jets...\n";
   jetOffset_.clear();
   using namespace reco;
   
   //    
   // Reestimate energy of jet (energy of jet with initial map)
   //
   jetOffset_.reserve(fjJets_->size());
   vector<fastjet::PseudoJet>::iterator pseudojetTMP = fjJets_->begin (),
     jetsEnd = fjJets_->end();
   for (; pseudojetTMP != jetsEnd; ++pseudojetTMP) {
     int ijet = pseudojetTMP - fjJets_->begin();
     jetOffset_[ijet] = 0;
     
     std::vector<fastjet::PseudoJet> towers =
       fastjet::sorted_by_pt( pseudojetTMP->constituents() );
     double newjetet = 0.;   
     for(vector<fastjet::PseudoJet>::const_iterator ito = towers.begin(),
       towEnd = towers.end(); 
     ito != towEnd; 
     ++ito)
       {
     const reco::CandidatePtr& originalTower = (*inputs_)[ito->user_index()];
     int it = ieta( originalTower );
     double Original_Et = originalTower->et();
     double etnew = Original_Et - (*emean_.find(it)).second - (*esigma_.find(it)).second; 
     if(etnew < 0.) etnew = 0;
     newjetet = newjetet + etnew;
     jetOffset_[ijet] += Original_Et - etnew;
       }
     double mScale = newjetet/pseudojetTMP->Et();
     LogDebug("PileUpSubtractor")<<"pseudojetTMP->Et() : "<<pseudojetTMP->Et()<<"\n";
     LogDebug("PileUpSubtractor")<<"newjetet : "<<newjetet<<"\n";
     LogDebug("PileUpSubtractor")<<"jetOffset_[ijet] : "<<jetOffset_[ijet]<<"\n";
     LogDebug("PileUpSubtractor")<<"pseudojetTMP->Et() - jetOffset_[ijet] : "<<pseudojetTMP->Et() - jetOffset_[ijet]<<"\n";
     LogDebug("PileUpSubtractor")<<"Scale is : "<<mScale<<"\n";
     int cshist = pseudojetTMP->cluster_hist_index();
     pseudojetTMP->reset_momentum(pseudojetTMP->px()*mScale, pseudojetTMP->py()*mScale,
                  pseudojetTMP->pz()*mScale, pseudojetTMP->e()*mScale);
     pseudojetTMP->set_cluster_hist_index(cshist);
     
   }
 }

void PileUpSubtractor::reset	(	std::vector< edm::Ptr< reco::Candidate > > &	input,
		std::vector< fastjet::PseudoJet > &	towers,
		std::vector< fastjet::PseudoJet > &	output
	)

virtual

Definition at line 47 of file PileUpSubtractor.cc.

References fjInputs_, fjJets_, fjOriginalInputs_, mps_fire::i, input, inputs_, and convertSQLitetoXML_cfg::output.

Referenced by ~PileUpSubtractor().

                                                      {
   
   inputs_ = &input;
   fjInputs_ = &towers;
   fjJets_ = &output;
   fjOriginalInputs_ = (*fjInputs_);
   for (unsigned int i = 0; i < fjInputs_->size(); ++i){
     fjOriginalInputs_[i].set_user_index((*fjInputs_)[i].user_index());
   }
   
 }

void PileUpSubtractor::setDefinition ( JetDefPtr const & jetDef )

virtual

Definition at line 61 of file PileUpSubtractor.cc.

References fjJetDefinition_.

Referenced by ~PileUpSubtractor().

                                                             {
   fjJetDefinition_ = JetDefPtr( new fastjet::JetDefinition( *jetDef ) );
 }

void PileUpSubtractor::setupGeometryMap	(	edm::Event &	iEvent,
		const edm::EventSetup &	iSetup
	)

virtual

Reimplemented in ParametrizedSubtractor, and VoronoiSubtractor.

Definition at line 65 of file PileUpSubtractor.cc.

References allgeomid_, particleFlowClusterECALTimeSelected_cfi::depth, geo_, geomtowers_, edm::EventSetup::get(), CaloGeometry::getValidDetIds(), DetId::Hcal, mps_fire::i, ieta(), ietamax_, ietamin_, LogDebug, ntowersWithJets_, and edm::ESHandle< T >::product().

Referenced by ~PileUpSubtractor().

 {
 
   LogDebug("PileUpSubtractor")<<"The subtractor setting up geometry...\n";
 
   if(geo_ == 0) {
     edm::ESHandle<CaloGeometry> pG;
     iSetup.get<CaloGeometryRecord>().get(pG);
     geo_ = pG.product();
     std::vector<DetId> alldid =  geo_->getValidDetIds();
 
     int ietaold = -10000;
     ietamax_ = -10000;
     ietamin_ = 10000;
     for(std::vector<DetId>::const_iterator did=alldid.begin(); did != alldid.end(); did++){
       if( (*did).det() == DetId::Hcal ){
         HcalDetId hid = HcalDetId(*did);
         if( (hid).depth() == 1 ) {
       allgeomid_.push_back(*did);
 
           if((hid).ieta() != ietaold){
             ietaold = (hid).ieta();
             geomtowers_[(hid).ieta()] = 1;
             if((hid).ieta() > ietamax_) ietamax_ = (hid).ieta();
             if((hid).ieta() < ietamin_) ietamin_ = (hid).ieta();
           }
           else{
             geomtowers_[(hid).ieta()]++;
           }
         }
       }
     }
   }
 
   for (int i = ietamin_; i<ietamax_+1; i++) {
     ntowersWithJets_[i] = 0;
   }
 }

void PileUpSubtractor::subtractPedestal ( std::vector< fastjet::PseudoJet > & coll )

virtual

Reimplemented in ParametrizedSubtractor, MultipleAlgoIterator, ReflectedIterator, and VoronoiSubtractor.

Definition at line 175 of file PileUpSubtractor.cc.

References emean_, esigma_, ieta(), diffTreeTool::index, and LogDebug.

Referenced by ~PileUpSubtractor().

 {
 
   LogDebug("PileUpSubtractor")<<"The subtractor subtracting pedestals...\n";
 
   int it = -100;
   for (vector<fastjet::PseudoJet>::iterator input_object = coll.begin (),
      fjInputsEnd = coll.end(); 
        input_object != fjInputsEnd; ++input_object) {
     
      reco::CandidatePtr const & itow =  (*inputs_)[ input_object->user_index() ];
     
     it = ieta( itow );
     
     double etnew = itow->et() - (*(emean_.find(it))).second - (*(esigma_.find(it))).second;
     float mScale = etnew/input_object->Et(); 
     if(etnew < 0.) mScale = 0.;
     
     math::XYZTLorentzVectorD towP4(input_object->px()*mScale, input_object->py()*mScale,
                    input_object->pz()*mScale, input_object->e()*mScale);
     
     int index = input_object->user_index();
     input_object->reset_momentum ( towP4.px(),
                    towP4.py(),
                    towP4.pz(),
                    towP4.energy() );
     input_object->set_user_index(index);
   }
 }