#include <Tau3MuReco.h>

Public Member Functions
bool	doTau3MuReco (const edm::Event &iEvent, const edm::EventSetup &iSetup, reco::MuonCollection muonCollection, reco::TrackCollection trackCollection)

	Tau3MuReco (const edm::ParameterSet &iConfig, edm::ConsumesCollector &&iC)

	~Tau3MuReco ()

Private Member Functions
bool	check4MuonTrack (const reco::Track &track)

bool	find3rdTrack (const edm::Event &iEvent, const edm::EventSetup &iSetup, const reco::TrackCollection &Tracks)

bool	findCorrectPairing ()

double	getDeltaR (const reco::Track &track1, const reco::Track &track2)

double	getInvariantMass (const reco::TrackCollection *tracks, const double MuonMass=0.106)

bool	removeIncorrectMuon ()

Private Attributes
const double	m_kMatchingDeltaR

const double	m_kMatchingPt

const double	m_kMuonMass

const edm::EDGetTokenT< reco::MuonCollection >	m_kMuonSourceToken

const double	m_kTauMass

const double	m_kTauMassCut

const edm::EDGetTokenT< reco::TrackCollection >	m_kTrackSourceToken

reco::MuonCollection *	m_MuonCollection

reco::TrackCollection *	m_TrackCollection

Detailed Description

Definition at line 13 of file Tau3MuReco.h.

Constructor & Destructor Documentation

Tau3MuReco::Tau3MuReco	(	const edm::ParameterSet &	iConfig,
		edm::ConsumesCollector &&	iC
	)

Definition at line 9 of file Tau3MuReco.cc.

                                                                                :m_kMatchingDeltaR(iConfig.getParameter<double>("RecoAnalysisMatchingDeltaR")),
                              m_kMatchingPt(iConfig.getParameter<double>("RecoAnalysisMatchingPt")),
                              m_kTauMassCut(iConfig.getParameter<double>("RecoAnalysisTauMassCut")),
                              m_kTauMass(iConfig.getParameter<double>("RecoAnalysisTauMass")),
                              m_kMuonMass(iConfig.getParameter<double>("RecoAnalysisMuonMass")),
                                                          m_kMuonSourceToken(iC.consumes<reco::MuonCollection>(iConfig.getParameter<edm::InputTag>("MuonSourceTag"))),
                                                          m_kTrackSourceToken(iC.consumes<reco::TrackCollection>(iConfig.getParameter<edm::InputTag>("TrackSourceTag")))
 {
 }

Tau3MuReco::~Tau3MuReco ( )

Definition at line 19 of file Tau3MuReco.cc.

 {
 
 }

Member Function Documentation

bool Tau3MuReco::check4MuonTrack ( const reco::Track & track )

private

Definition at line 86 of file Tau3MuReco.cc.

References reco::TrackBase::charge(), getDeltaR(), LogDebug, m_kMatchingDeltaR, m_kMatchingPt, m_TrackCollection, and reco::TrackBase::pt().

Referenced by find3rdTrack().

 {
     reco::TrackCollection::const_iterator iter;
 
     for(iter = m_TrackCollection->begin(); iter!=m_TrackCollection->end(); iter++)
     {
         //check if the track has the right charge
         //and check if dR is smaller than fMatchingDeltaR
         if((*iter).charge() == track.charge()
            && getDeltaR(*iter,track)<m_kMatchingDeltaR
            && fabs(((*iter).pt())-(track.pt()))<=(track.pt()*m_kMatchingPt))
         {
             LogDebug("Tau3MuReco") << "Found muon track in Tracks with DeltaR: " << getDeltaR(*iter,track)
                        << " Pt: " << track.pt()
                        << " Muons Pt is: " << (*iter).pt() << std::endl;
             return true;
         }
     }
     return false;
 }

bool Tau3MuReco::doTau3MuReco	(	const edm::Event &	iEvent,
		const edm::EventSetup &	iSetup,
		reco::MuonCollection *	muonCollection,
		reco::TrackCollection *	trackCollection
	)

Definition at line 24 of file Tau3MuReco.cc.

References find3rdTrack(), findCorrectPairing(), edm::Event::getByToken(), getInvariantMass(), LogDebug, m_kMuonMass, m_kMuonSourceToken, m_kTauMass, m_kTauMassCut, m_kTrackSourceToken, m_MuonCollection, m_TrackCollection, metsig::muon, HiRecoMuon_cff::muonCollection, extraflags_cff::muons, edm::Handle< T >::product(), removeIncorrectMuon(), findElectronsInSiStrips_cfi::trackCollection, and l1t::tracks.

Referenced by Tau3MuSkim::filter().

 {
     m_MuonCollection = muonCollection;
     m_TrackCollection = trackCollection;
 
     edm::Handle<reco::MuonCollection> muons;
     edm::Handle<reco::TrackCollection> tracks;
 
     reco::MuonCollection::const_iterator muon;
 
     iEvent.getByToken(m_kMuonSourceToken, muons);
     iEvent.getByToken(m_kTrackSourceToken, tracks);
 
     for( muon = muons->begin(); muon != muons->end(); ++muon )
     {
     m_TrackCollection->push_back(*(muon->track().get()));
         m_MuonCollection->push_back(*muon);
     }
 
     if( m_TrackCollection->size() > 3 )
     {
         //find the right three ones coming from tau
         if(findCorrectPairing()==false)
         {  //maybe implement something like in ==3 (throw away ....)
         LogDebug("Tau3MuReco") << "Could not find correct combination!" << std::endl;
         return false;
         }
 
     return true;
     }
 
     if( m_TrackCollection->size() == 3 )
     {
         if(fabs(getInvariantMass(m_TrackCollection, m_kMuonMass)-m_kTauMass)<=m_kTauMassCut)
             return true;
         else//throw away one muon which don't match
             removeIncorrectMuon();
 
     }
 
     if( m_TrackCollection->size() == 2)
     {
         //search the third track
 
         //get 3rd muon canidate from tracks
         if(find3rdTrack(iEvent, iSetup, *(tracks.product()))==false)
         {
             LogDebug("Tau3MuReco") << "A 3rd Track can not be assigned!" << std::endl;
             return false;
         }
         else
             return true;
     }
 
     // cannot use this event, because less than 2 muons have been found
 
     LogDebug("Tau3MuReco") << "Not enough (" << m_TrackCollection->size() << ") muons found! Event skipped!" << std::endl;
 
     return false;
 }

bool Tau3MuReco::find3rdTrack	(	const edm::Event &	iEvent,
		const edm::EventSetup &	iSetup,
		const reco::TrackCollection &	Tracks
	)

private

Definition at line 108 of file Tau3MuReco.cc.

References ALCARECOTkAlJpsiMuMu_cff::charge, check4MuonTrack(), KineDebug3::count(), getDeltaR(), getInvariantMass(), LogDebug, m_kTauMass, m_kTauMassCut, m_TrackCollection, and HiIsolationCommonParameters_cff::track.

Referenced by doTau3MuReco().

 {
     //check size of TrackVector (should be two!)
     if(m_TrackCollection->size()!=2)
         return false;
 
     //more then two tracks should be in the event
     if(Tracks.size()<=2)
         return false;
 
     double SumDeltaR = 0;
 
     double MuonDeltaR = getDeltaR(m_TrackCollection->at(0),m_TrackCollection->at(1));
 
     //Loop overall tracks
 
     LogDebug("Tau3MuReco") << "Number of tracks found: " << Tracks.size() << std::endl;
 
     std::multimap<double, const reco::Track> TrackMultiMap;
 
     unsigned short muonCounter = 0;
 
     reco::TrackCollection::const_iterator track;
 
     for(track=Tracks.begin(); track!=Tracks.end(); track++)
     {
     if(check4MuonTrack(*track))
         {
             muonCounter++;
             continue;
         }
 
         SumDeltaR = MuonDeltaR;
 
         SumDeltaR += getDeltaR(m_TrackCollection->at(1), *track);
         SumDeltaR += getDeltaR(*track,m_TrackCollection->at(0));
 
         std::pair<double, const reco::Track> actTrack(SumDeltaR,*track);
 
         TrackMultiMap.insert(actTrack);
     }
 
     //two tracks should be clearly identified as muons by check4MuonTrack
     //else event is not useable
     if(muonCounter<2)
     {
         LogDebug("Tau3MuReco") << "Not enough muons (" << muonCounter << ") assigned to a track! Event skipped!" << std::endl;
         return false;
     }
 
     std::multimap<double, const reco::Track>::iterator it = TrackMultiMap.begin();
 
     if(it==TrackMultiMap.end())
     {
         LogDebug("Tau3MuReco") << "Not enough tracks (0) left! Event skipped!" << std::endl;
         return false;
     }
 
     //get 2mu+track with minimal DeltaR Sum (MultiMaps are sorted)
     m_TrackCollection->push_back((*it).second);
 
     //and check charge of this track
     //and check invariant mass of this combination
     //and make a vertex fit
 
     char Charge = m_TrackCollection->at(0).charge() * m_TrackCollection->at(1).charge();
 
     unsigned int  count = 0;
 
     //Charge > 0 means the two muons have same charge, so the third track has to have the opposit charge
     while((Charge > 0 && ((*it).second).charge()==(m_TrackCollection->at(0)).charge())
           || fabs(getInvariantMass(m_TrackCollection)-m_kTauMass) > m_kTauMassCut
         )
     {
 
         count++;
 
         LogDebug("Tau3MuReco") << "Track canidate: " << count << std::endl;
 
         if(Charge > 0 && ((*it).second).charge()!=(m_TrackCollection->at(0)).charge())
     LogDebug("Tau3MuReco") << "\tWrong charge!" << std::endl;
         LogDebug("Tau3MuReco") << "\tInvariant Mass deviation! " << fabs(getInvariantMass(m_TrackCollection)-m_kTauMass) << std::endl;
         LogDebug("Tau3MuReco") << "\tTrack Pt: " << (*it).second.pt() << std::endl;
         LogDebug("Tau3MuReco") << "\tDelta R: " << (*it).first << std::endl;
         LogDebug("Tau3MuReco") << "\tChi2: " << ((*it).second).normalizedChi2() << std::endl;
 
         ++it;
 
         //was not the best canidate
         m_TrackCollection->pop_back();
 
         if(it==TrackMultiMap.end())
             return false;
 
         //get next to minimal (Delta R Sum) track
         m_TrackCollection->push_back((*it).second);
     }
 
     LogDebug("Tau3MuReco") << "Found corresponding 3rd track: " << std::endl;
     LogDebug("Tau3MuReco") << "Track canidate: " << count << std::endl;
     LogDebug("Tau3MuReco") << "\tInvariant Mass deviation! " << fabs(getInvariantMass(m_TrackCollection)-m_kTauMass) << std::endl;
     LogDebug("Tau3MuReco") << "\tDelta R: " << (*it).first << std::endl;
     LogDebug("Tau3MuReco") << "\tNormChi2: " << ((*it).second).normalizedChi2() << std::endl;
 
     //choose this track, because it is the best canidate
     return true;
 }

bool Tau3MuReco::findCorrectPairing ( )

private

Definition at line 216 of file Tau3MuReco.cc.

References funct::abs(), ALCARECOTkAlJpsiMuMu_cff::charge, Combinatorics::GetCombinations(), getInvariantMass(), mps_fire::i, createfilelist::int, LogDebug, m_kTauMass, m_kTauMassCut, m_MuonCollection, and m_TrackCollection.

Referenced by doTau3MuReco().

 {
     Combinatorics myCombinatorics(m_TrackCollection->size(), 3);
 
     std::vector < std::vector<UInt_t> > CombinationVec = myCombinatorics.GetCombinations();
 
     std::vector< std::vector<UInt_t> >::iterator it = CombinationVec.begin();
 
     char Charge = 0;
 
     reco::TrackCollection tempTrackCollection;
     reco::MuonCollection tempMuonCollection;
 
     do
     {
         if(it==CombinationVec.end())
             return false;
 
         Charge = 0;
 
         tempMuonCollection.clear();
     tempTrackCollection.clear();
 
         for(UInt_t i=0; i< (*it).size(); i++)
         {
             Charge += m_TrackCollection->at((*it).at(i)).charge();
             tempTrackCollection.push_back(m_TrackCollection->at((*it).at(i)));
         tempMuonCollection.push_back(m_MuonCollection->at((*it).at(i)));
         }
 
         LogDebug("Tau3MuReco") << "Charge is: " << (int)Charge << " Have to be -1 or 1!!!" << std::endl;
         LogDebug("Tau3MuReco") << "Invariant mass is: " << fabs(getInvariantMass(&tempTrackCollection)-m_kTauMass) << " Have to be smaller than " << m_kTauMassCut << std::endl;
 
         it++;
     }
     while(abs(Charge)!=1 || fabs(getInvariantMass(&tempTrackCollection)-m_kTauMass)>m_kTauMassCut);
 
     *m_MuonCollection = tempMuonCollection;
     *m_TrackCollection = tempTrackCollection;
 
     return true;
 }

double Tau3MuReco::getDeltaR	(	const reco::Track &	track1,
		const reco::Track &	track2
	)

private

Definition at line 308 of file Tau3MuReco.cc.

References particleFlow_cfi::dEta, particleFlow_cfi::dPhi, reco::TrackBase::eta(), reco::TrackBase::phi(), Pi, funct::pow(), and mathSSE::sqrt().

Referenced by check4MuonTrack(), find3rdTrack(), and removeIncorrectMuon().

 {
     double dEta = track1.eta() - track2.eta();
     double dPhi = track1.phi() - track2.phi();
 
     while(dPhi >= TMath::Pi())       dPhi -= (2.0*TMath::Pi());
     while(dPhi < (-1.0*TMath::Pi())) dPhi += (2.0*TMath::Pi());
 
     return sqrt(pow(dEta,2)+pow(dPhi,2));
 }

double Tau3MuReco::getInvariantMass	(	const reco::TrackCollection *	tracks,
		const double	MuonMass = `0.106`
	)

private

Definition at line 284 of file Tau3MuReco.cc.

References mps_fire::i, funct::pow(), and mathSSE::sqrt().

Referenced by doTau3MuReco(), find3rdTrack(), and findCorrectPairing().

 {
     unsigned int numOfParticles = tracks->size();
 
     double SumPx = 0;
     double SumPy = 0;
     double SumPz = 0;
 
     double SumE = 0;
 
     for(unsigned int i=0; i<numOfParticles; i++)
     {
     SumPx += tracks->at(i).px();
     SumPy += tracks->at(i).py();
     SumPz += tracks->at(i).pz();
 
     SumE += sqrt(pow(tracks->at(i).p(),2)+pow(MuonMass,2));
     }
 
     double invmass = sqrt(pow(SumE,2)-pow(SumPx,2)-pow(SumPy,2)-pow(SumPz,2));
 
     return invmass;
 }

bool Tau3MuReco::removeIncorrectMuon ( )

private

Definition at line 259 of file Tau3MuReco.cc.

References getDeltaR(), m_TrackCollection, and groupFilesInBlocks::temp.

Referenced by doTau3MuReco().

 {
 
     double deltaR12 = getDeltaR(m_TrackCollection->at(0),m_TrackCollection->at(1));
     double deltaR23 = getDeltaR(m_TrackCollection->at(1),m_TrackCollection->at(2));
     double deltaR31 = getDeltaR(m_TrackCollection->at(2),m_TrackCollection->at(0));
 
     //if DeltaR12 is the smallest, than the 3rd one seems to be wrong
     //if DeltaR23 is the smallest, than the 2nd one seems to be wrong
     //if DeltaR31 is the smallest, than the 1st one seems to be wrong
 
     unsigned char temp;
     double junk;
 
     deltaR12 < deltaR23 ? temp=3 : temp=1;
     deltaR12 < deltaR23 ? junk=deltaR12 : junk=deltaR23;
 
     if(deltaR31 < junk)
         temp=2;
 
     m_TrackCollection->erase(m_TrackCollection->begin()+temp-1);
 
     return true;
 }