Inheritance diagram for BtoCharmDecayVertexMergerT< VTX >:

Classes
struct	VertexProxy

Public Types
typedef reco::TemplatedSecondaryVertex< VTX >	SecondaryVertex

Public Types inherited from edm::stream::EDProducer<>
typedef CacheContexts< T... >	CacheTypes

typedef CacheTypes::GlobalCache	GlobalCache

typedef AbilityChecker< T... >	HasAbility

typedef CacheTypes::LuminosityBlockCache	LuminosityBlockCache

typedef LuminosityBlockContextT< LuminosityBlockCache, RunCache, GlobalCache >	LuminosityBlockContext

typedef CacheTypes::LuminosityBlockSummaryCache	LuminosityBlockSummaryCache

typedef CacheTypes::RunCache	RunCache

typedef RunContextT< RunCache, GlobalCache >	RunContext

typedef CacheTypes::RunSummaryCache	RunSummaryCache

Public Types inherited from edm::stream::EDProducerBase
typedef EDProducerAdaptorBase	ModuleType

Public Types inherited from edm::ProducerBase
using	ModuleToResolverIndicies = std::unordered_multimap< std::string, std::tuple< edm::TypeID const , const char , edm::ProductResolverIndex >>

typedef ProductRegistryHelper::TypeLabelList	TypeLabelList

Public Types inherited from edm::EDConsumerBase
typedef ProductLabels	Labels

Public Member Functions
	BtoCharmDecayVertexMergerT (const edm::ParameterSet &params)

virtual void	produce (edm::Event &event, const edm::EventSetup &es)

Public Member Functions inherited from edm::stream::EDProducer<>
	EDProducer ()=default

Public Member Functions inherited from edm::stream::EDProducerBase
	EDProducerBase ()

ModuleDescription const &	moduleDescription () const

	~EDProducerBase () override

Public Member Functions inherited from edm::ProducerBase
void	callWhenNewProductsRegistered (std::function< void(BranchDescription const &)> const &func)

std::vector< edm::ProductResolverIndex > const &	indiciesForPutProducts (BranchType iBranchType) const

	ProducerBase ()

std::vector< edm::ProductResolverIndex > const &	putTokenIndexToProductResolverIndex () const

void	registerProducts (ProducerBase , ProductRegistry , ModuleDescription const &)

std::function< void(BranchDescription const &)>	registrationCallback () const
	used by the fwk to register list of products More...

void	resolvePutIndicies (BranchType iBranchType, ModuleToResolverIndicies const &iIndicies, std::string const &moduleLabel)

virtual	~ProducerBase () noexcept(false)

Public Member Functions inherited from edm::EDConsumerBase
std::vector< ConsumesInfo >	consumesInfo () const

void	convertCurrentProcessAlias (std::string const &processName)
	Convert "@currentProcess" in InputTag process names to the actual current process name. More...

	EDConsumerBase ()

	EDConsumerBase (EDConsumerBase const &)=delete

	EDConsumerBase (EDConsumerBase &&)=default

ProductResolverIndexAndSkipBit	indexFrom (EDGetToken, BranchType, TypeID const &) const

void	itemsMayGet (BranchType, std::vector< ProductResolverIndexAndSkipBit > &) const

void	itemsToGet (BranchType, std::vector< ProductResolverIndexAndSkipBit > &) const

std::vector< ProductResolverIndexAndSkipBit > const &	itemsToGetFrom (BranchType iType) const

void	labelsForToken (EDGetToken iToken, Labels &oLabels) const

void	modulesWhoseProductsAreConsumed (std::vector< ModuleDescription const * > &modules, ProductRegistry const &preg, std::map< std::string, ModuleDescription const * > const &labelsToDesc, std::string const &processName) const

EDConsumerBase const &	operator= (EDConsumerBase const &)=delete

EDConsumerBase &	operator= (EDConsumerBase &&)=default

bool	registeredToConsume (ProductResolverIndex, bool, BranchType) const

bool	registeredToConsumeMany (TypeID const &, BranchType) const

void	updateLookup (BranchType iBranchType, ProductResolverIndexHelper const &, bool iPrefetchMayGet)

virtual	~EDConsumerBase () noexcept(false)

Private Member Functions
VertexProxy	buildVertexProxy (const VTX &vtx)

template<>
BtoCharmDecayVertexMergerT< reco::Vertex >::VertexProxy	buildVertexProxy (const reco::Vertex &vtx)

template<>
BtoCharmDecayVertexMergerT< reco::VertexCompositePtrCandidate >::VertexProxy	buildVertexProxy (const reco::VertexCompositePtrCandidate &vtx)

GlobalVector	flightDirection (const reco::Vertex &v1, const reco::Vertex &v2)

GlobalVector	flightDirection (const reco::Vertex &v1, const reco::VertexCompositePtrCandidate &v2)

GlobalVector	flightDirection (const reco::VertexCompositePtrCandidate &v1, const reco::VertexCompositePtrCandidate &v2)

void	resolveBtoDchain (std::vector< VertexProxy > &coll, unsigned int i, unsigned int k)

template<>
void	resolveBtoDchain (std::vector< VertexProxy > &coll, unsigned int i, unsigned int k)

template<>
void	resolveBtoDchain (std::vector< VertexProxy > &coll, unsigned int i, unsigned int k)

Private Attributes
double	maxDRForUnique

double	maxPtreltomerge

double	maxvecSumIMCUTForUnique

double	minCosPAtomerge

reco::Vertex	pv

edm::EDGetTokenT< reco::VertexCollection >	token_primaryVertex

edm::EDGetTokenT< edm::View< VTX > >	token_secondaryVertex

Friends
bool	operator< (VertexProxy v1, VertexProxy v2)

Additional Inherited Members
Static Public Member Functions inherited from edm::stream::EDProducerBase
static const std::string &	baseType ()

static void	fillDescriptions (ConfigurationDescriptions &descriptions)

static void	prevalidate (ConfigurationDescriptions &descriptions)

Protected Member Functions inherited from edm::EDConsumerBase
template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	consumes (edm::InputTag const &tag)

EDGetToken	consumes (const TypeToGet &id, edm::InputTag const &tag)

template<BranchType B>
EDGetToken	consumes (TypeToGet const &id, edm::InputTag const &tag)

ConsumesCollector	consumesCollector ()
	Use a ConsumesCollector to gather consumes information from helper functions. More...

template<typename ProductType , BranchType B = InEvent>
void	consumesMany ()

void	consumesMany (const TypeToGet &id)

template<BranchType B>
void	consumesMany (const TypeToGet &id)

template<typename ProductType , BranchType B = InEvent>
EDGetTokenT< ProductType >	mayConsume (edm::InputTag const &tag)

EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)

template<BranchType B>
EDGetToken	mayConsume (const TypeToGet &id, edm::InputTag const &tag)

Detailed Description

template<typename VTX>
class BtoCharmDecayVertexMergerT< VTX >

Definition at line 41 of file BtoCharmDecayVertexMerger.cc.

Member Typedef Documentation

template<typename VTX >

typedef reco::TemplatedSecondaryVertex<VTX> BtoCharmDecayVertexMergerT< VTX >::SecondaryVertex

Definition at line 47 of file BtoCharmDecayVertexMerger.cc.

Constructor & Destructor Documentation

template<typename VTX >

BtoCharmDecayVertexMergerT< VTX >::BtoCharmDecayVertexMergerT ( const edm::ParameterSet & params )

Definition at line 82 of file BtoCharmDecayVertexMerger.cc.

                                                                                          :
        token_primaryVertex(consumes<reco::VertexCollection>(params.getParameter<edm::InputTag>("primaryVertices"))),
        token_secondaryVertex(consumes<edm::View<VTX> >(params.getParameter<edm::InputTag>("secondaryVertices"))),
        maxDRForUnique(params.getParameter<double>("maxDRUnique")),
        maxvecSumIMCUTForUnique(params.getParameter<double>("maxvecSumIMifsmallDRUnique")),
        minCosPAtomerge(params.getParameter<double>("minCosPAtomerge")),
        maxPtreltomerge(params.getParameter<double>("maxPtreltomerge"))
        // maxFraction(params.getParameter<double>("maxFraction")),
        // minSignificance(params.getParameter<double>("minSignificance"))
 {
        produces<std::vector<VTX> >();
 }

Member Function Documentation

template<typename VTX >

VertexProxy BtoCharmDecayVertexMergerT< VTX >::buildVertexProxy ( const VTX & vtx )

private

Referenced by BtoCharmDecayVertexMergerT< VTX >::produce().

template<>

BtoCharmDecayVertexMergerT< reco::Vertex >::VertexProxy BtoCharmDecayVertexMergerT< reco::Vertex >::buildVertexProxy ( const reco::Vertex & vtx )

private

Definition at line 174 of file BtoCharmDecayVertexMerger.cc.

References reco::Vertex::p4(), reco::Vertex::tracksSize(), and badGlobalMuonTaggersAOD_cff::vtx.

                                                                                {
   VertexProxy vtxProxy = {vtx,vtx.p4().M(),vtx.tracksSize()};
   return vtxProxy;
 }

template<>

BtoCharmDecayVertexMergerT< reco::VertexCompositePtrCandidate >::VertexProxy BtoCharmDecayVertexMergerT< reco::VertexCompositePtrCandidate >::buildVertexProxy ( const reco::VertexCompositePtrCandidate & vtx )

private

Definition at line 181 of file BtoCharmDecayVertexMerger.cc.

References reco::CompositePtrCandidate::numberOfSourceCandidatePtrs(), badGlobalMuonTaggersAOD_cff::vtx, and vtxP4().

                                                                                                                          {
   VertexProxy vtxProxy = {vtx,vtxP4(vtx).M(),vtx.numberOfSourceCandidatePtrs()};
   return vtxProxy;
 }

template<typename VTX >

GlobalVector BtoCharmDecayVertexMergerT< VTX >::flightDirection	(	const reco::Vertex &	v1,
		const reco::Vertex &	v2
	)

private

Definition at line 148 of file BtoCharmDecayVertexMerger.cc.

References reco::Vertex::x(), reco::Vertex::y(), and reco::Vertex::z().

Referenced by BtoCharmDecayVertexMergerT< VTX >::resolveBtoDchain().

                                                                                              {
   return  GlobalVector(v2.x() - v1.x(),
                        v2.y() - v1.y(),
                        v2.z() - v1.z());
 }

template<typename VTX >

GlobalVector BtoCharmDecayVertexMergerT< VTX >::flightDirection	(	const reco::Vertex &	v1,
		const reco::VertexCompositePtrCandidate &	v2
	)

private

Definition at line 156 of file BtoCharmDecayVertexMerger.cc.

References reco::LeafCandidate::vertex(), reco::Vertex::x(), reco::Vertex::y(), and reco::Vertex::z().

                                                                                                                   {
   return  GlobalVector(v2.vertex().x() - v1.x(),
                        v2.vertex().y() - v1.y(),
                        v2.vertex().z() - v1.z());
 }

template<typename VTX >

GlobalVector BtoCharmDecayVertexMergerT< VTX >::flightDirection	(	const reco::VertexCompositePtrCandidate &	v1,
		const reco::VertexCompositePtrCandidate &	v2
	)

private

Definition at line 164 of file BtoCharmDecayVertexMerger.cc.

References reco::LeafCandidate::vertex().

                                                                                                                                        {
   return  GlobalVector(v2.vertex().x() - v1.vertex().x(),
                        v2.vertex().y() - v1.vertex().y(),
                        v2.vertex().z() - v1.vertex().z());
 }

template<typename VTX >

void BtoCharmDecayVertexMergerT< VTX >::produce	(	edm::Event &	event,
		const edm::EventSetup &	es
	)

virtual

Definition at line 96 of file BtoCharmDecayVertexMerger.cc.

References BtoCharmDecayVertexMergerT< VTX >::buildVertexProxy(), edm::Event::getByToken(), eostools::move(), edm::Handle< T >::product(), edm::Event::put(), BtoCharmDecayVertexMergerT< VTX >::pv, BtoCharmDecayVertexMergerT< VTX >::resolveBtoDchain(), lostTracks_cfi::secondaryVertices, pfDeepBoostedJetPreprocessParams_cfi::sv, BtoCharmDecayVertexMergerT< VTX >::token_primaryVertex, and BtoCharmDecayVertexMergerT< VTX >::token_secondaryVertex.

                                                                                           {
 
   using namespace reco;
   // PV
   edm::Handle<reco::VertexCollection> PVcoll;
   iEvent.getByToken(token_primaryVertex, PVcoll);
 
   if(PVcoll->size()!=0) {
 
   const reco::VertexCollection pvc = *( PVcoll.product());
   pv = pvc[0];
 
   // get the IVF collection
   edm::Handle<edm::View<VTX> > secondaryVertices;
   iEvent.getByToken(token_secondaryVertex, secondaryVertices);
 
 
 
   //loop over vertices,  fill into own collection for sorting
   std::vector<VertexProxy> vertexProxyColl;
   for(typename edm::View<VTX>::const_iterator sv = secondaryVertices->begin();
       sv != secondaryVertices->end(); ++sv) {
     vertexProxyColl.push_back( buildVertexProxy(*sv) );
   }
 
   // sort the vertices by mass and track multiplicity
   sort( vertexProxyColl.begin(), vertexProxyColl.end());
 
 
   // loop forward over all vertices
   for(unsigned int iVtx=0; iVtx < vertexProxyColl.size(); ++iVtx){
 
     // nested loop backwards (in order to start from light masses)
     // check all vertices against each other for B->D chain
     for(unsigned int kVtx=vertexProxyColl.size()-1; kVtx>iVtx; --kVtx){
       // remove D vertices from the collection and add the tracks to the original one
       resolveBtoDchain(vertexProxyColl, iVtx, kVtx);
     }
   }
 
   // now create new vertex collection and add to event
   auto bvertColl = std::make_unique<std::vector<VTX>>();
   for(typename std::vector<VertexProxy>::const_iterator it=vertexProxyColl.begin(); it!=vertexProxyColl.end(); ++it) bvertColl->push_back((*it).vert);
   iEvent.put(std::move(bvertColl));
   }
   else{
     iEvent.put(std::make_unique<std::vector<VTX>>());
   }
 }

template<typename VTX >

void BtoCharmDecayVertexMergerT< VTX >::resolveBtoDchain	(	std::vector< VertexProxy > &	coll,
		unsigned int	i,
		unsigned int	k
	)

private

Referenced by BtoCharmDecayVertexMergerT< VTX >::produce().

template<>

void BtoCharmDecayVertexMergerT< reco::Vertex >::resolveBtoDchain	(	std::vector< VertexProxy > &	coll,
		unsigned int	i,
		unsigned int	k
	)

private

Definition at line 188 of file BtoCharmDecayVertexMerger.cc.

References funct::abs(), deltaR(), reco::TemplatedSecondaryVertex< SV >::dist3d(), Vector3DBase< T, FrameTag >::dot(), dot(), spr::find(), BtoCharmDecayVertexMergerT< VTX >::flightDirection(), mps_fire::i, gen::k, PV3DBase< T, PVType, FrameType >::mag(), BtoCharmDecayVertexMergerT< VTX >::maxDRForUnique, BtoCharmDecayVertexMergerT< VTX >::maxPtreltomerge, BtoCharmDecayVertexMergerT< VTX >::maxvecSumIMCUTForUnique, BtoCharmDecayVertexMergerT< VTX >::minCosPAtomerge, reco::ParticleMasses::piPlus, BtoCharmDecayVertexMergerT< VTX >::pv, mathSSE::sqrt(), lumiQTWidget::t, groupFilesInBlocks::temp, tracks_, and Measurement1D::value().

                                                                                                                          {
   using namespace reco;
 
   GlobalVector momentum1 = GlobalVector(coll[i].vert.p4().X(), coll[i].vert.p4().Y(), coll[i].vert.p4().Z());
   GlobalVector momentum2 = GlobalVector(coll[k].vert.p4().X(), coll[k].vert.p4().Y(), coll[k].vert.p4().Z());
 
   SecondaryVertex sv1(pv, coll[i].vert, momentum1 , true);
   SecondaryVertex sv2(pv, coll[k].vert, momentum2 , true);
 
 
   // find out which one is near and far
   SecondaryVertex svNear = sv1;
   SecondaryVertex svFar  = sv2;
   GlobalVector momentumNear  = momentum1;
   GlobalVector momentumFar   = momentum2;
 
   // swap if it is the other way around
   if(sv1.dist3d().value() >= sv2.dist3d().value()){
     svNear = sv2;
     svFar = sv1;
     momentumNear = momentum2;
     momentumFar = momentum1;
   }
   GlobalVector nearToFar = flightDirection( svNear, svFar);
   GlobalVector pvToNear  = flightDirection( pv, svNear);
   GlobalVector pvToFar   = flightDirection( pv, svFar);
 
   double cosPA =  nearToFar.dot(momentumFar) / momentumFar.mag()/ nearToFar.mag();
   double cosa  =  pvToNear. dot(momentumFar) / pvToNear.mag()   / momentumFar.mag();
   double ptrel = sqrt(1.0 - cosa*cosa)* momentumFar.mag();
 
   double vertexDeltaR = Geom::deltaR(pvToNear, pvToFar);
 
   // create a set of all tracks from both vertices, avoid double counting by using a std::set<>
   std::set<reco::TrackRef> trackrefs;
   // first vertex
   for(reco::Vertex::trackRef_iterator ti = sv1.tracks_begin(); ti!=sv1.tracks_end(); ++ti){
     if(sv1.trackWeight(*ti)>0.5){
       reco::TrackRef t = ti->castTo<reco::TrackRef>();
       trackrefs.insert(t);
     }
   }
   // second vertex
   for(reco::Vertex::trackRef_iterator ti = sv2.tracks_begin(); ti!=sv2.tracks_end(); ++ti){
     if(sv2.trackWeight(*ti)>0.5){
       reco::TrackRef t = ti->castTo<reco::TrackRef>();
       trackrefs.insert(t);
     }
   }
 
   // now calculate one LorentzVector from the track momenta
   ROOT::Math::LorentzVector<ROOT::Math::PxPyPzM4D<double> > mother;
   for(std::set<reco::TrackRef>::const_iterator it = trackrefs.begin(); it!= trackrefs.end(); ++it){
     ROOT::Math::LorentzVector<ROOT::Math::PxPyPzM4D<double> >  temp ( (*it)->px(),(*it)->py(),(*it)->pz(), ParticleMasses::piPlus );
     mother += temp;
   }
 
 
   //   check if criteria for merging are fulfilled
   if(vertexDeltaR<maxDRForUnique && mother.M()<maxvecSumIMCUTForUnique && cosPA>minCosPAtomerge && std::abs(ptrel)<maxPtreltomerge ) {
 
 
     // add tracks of second vertex which are missing to first vertex
     // loop over the second
     bool bFoundDuplicate=false;
     for(reco::Vertex::trackRef_iterator ti = sv2.tracks_begin(); ti!=sv2.tracks_end(); ++ti){
       reco::Vertex::trackRef_iterator it = find(sv1.tracks_begin(), sv1.tracks_end(), *ti);
       if (it==sv1.tracks_end()) coll[i].vert.add( *ti, sv2.refittedTrack(*ti), sv2.trackWeight(*ti) );
       else bFoundDuplicate=true;
     }
     // in case a duplicate track is found, need to create the full track list in the vertex from scratch because we need to modify the weight.
     // the weight must be the larger one, otherwise we may have outliers which are not real outliers
 
     if(bFoundDuplicate){
       // create backup track containers from main vertex
       std::vector<TrackBaseRef > tracks_;
       std::vector<Track> refittedTracks_;
       std::vector<float> weights_;
       for(reco::Vertex::trackRef_iterator it = coll[i].vert.tracks_begin(); it!=coll[i].vert.tracks_end(); ++it) {
        tracks_.push_back( *it);
        refittedTracks_.push_back( coll[i].vert.refittedTrack(*it));
        weights_.push_back( coll[i].vert.trackWeight(*it) );
       }
       // delete tracks and add all tracks back, and check in which vertex the weight is larger
       coll[i].vert.removeTracks();
       std::vector<Track>::iterator it2 = refittedTracks_.begin();
       std::vector<float>::iterator it3 = weights_.begin();
       for(reco::Vertex::trackRef_iterator it = tracks_.begin(); it!=tracks_.end(); ++it, ++it2, ++it3){
        float weight = *it3;
        float weight2= sv2.trackWeight(*it);
        Track refittedTrackWithLargerWeight = *it2;
        if( weight2 >weight) {
          weight = weight2;
          refittedTrackWithLargerWeight = sv2.refittedTrack(*it);
        }
        coll[i].vert.add(*it , refittedTrackWithLargerWeight  , weight);
       }
     }
 
     // remove the second vertex from the collection
     coll.erase( coll.begin() + k  );
   }
 
 }

template<>

void BtoCharmDecayVertexMergerT< reco::VertexCompositePtrCandidate >::resolveBtoDchain	(	std::vector< VertexProxy > &	coll,
		unsigned int	i,
		unsigned int	k
	)

private

Definition at line 294 of file BtoCharmDecayVertexMerger.cc.

References funct::abs(), deltaR(), reco::TemplatedSecondaryVertex< SV >::dist3d(), Vector3DBase< T, FrameTag >::dot(), dot(), spr::find(), BtoCharmDecayVertexMergerT< VTX >::flightDirection(), mps_fire::i, gen::k, PV3DBase< T, PVType, FrameType >::mag(), BtoCharmDecayVertexMergerT< VTX >::maxDRForUnique, BtoCharmDecayVertexMergerT< VTX >::maxPtreltomerge, BtoCharmDecayVertexMergerT< VTX >::maxvecSumIMCUTForUnique, BtoCharmDecayVertexMergerT< VTX >::minCosPAtomerge, reco::ParticleMasses::piPlus, BtoCharmDecayVertexMergerT< VTX >::pv, mathSSE::sqrt(), groupFilesInBlocks::temp, Measurement1D::value(), and vtxP4().

                                                                                                                                               {
   using namespace reco;
 
   Candidate::LorentzVector vtx1P4 = vtxP4(coll[i].vert);
   Candidate::LorentzVector vtx2P4 = vtxP4(coll[k].vert);
   GlobalVector momentum1 = GlobalVector(vtx1P4.X(), vtx1P4.Y(), vtx1P4.Z());
   GlobalVector momentum2 = GlobalVector(vtx2P4.X(), vtx2P4.Y(), vtx2P4.Z());
 
   SecondaryVertex sv1(pv, coll[i].vert, momentum1 , true);
   SecondaryVertex sv2(pv, coll[k].vert, momentum2 , true);
 
 
   // find out which one is near and far
   SecondaryVertex svNear = sv1;
   SecondaryVertex svFar  = sv2;
   GlobalVector momentumNear  = momentum1;
   GlobalVector momentumFar   = momentum2;
 
   // swap if it is the other way around
   if(sv1.dist3d().value() >= sv2.dist3d().value()){
     svNear = sv2;
     svFar = sv1;
     momentumNear = momentum2;
     momentumFar = momentum1;
   }
   GlobalVector nearToFar = flightDirection( svNear, svFar);
   GlobalVector pvToNear  = flightDirection( pv, svNear);
   GlobalVector pvToFar   = flightDirection( pv, svFar);
 
   double cosPA =  nearToFar.dot(momentumFar) / momentumFar.mag()/ nearToFar.mag();
   double cosa  =  pvToNear. dot(momentumFar) / pvToNear.mag()   / momentumFar.mag();
   double ptrel = sqrt(1.0 - cosa*cosa)* momentumFar.mag();
 
   double vertexDeltaR = Geom::deltaR(pvToNear, pvToFar);
 
   // create a set of all tracks from both vertices, avoid double counting by using a std::set<>
   std::set<reco::CandidatePtr> trackrefs;
   // first vertex
   for(size_t i=0; i < sv1.numberOfSourceCandidatePtrs(); ++i)
       trackrefs.insert(sv1.daughterPtr(i));
   // second vertex
   for(size_t i=0; i < sv2.numberOfSourceCandidatePtrs(); ++i)
       trackrefs.insert(sv2.daughterPtr(i));
 
   // now calculate one LorentzVector from the track momenta
   Candidate::LorentzVector mother;
   for(std::set<reco::CandidatePtr>::const_iterator it = trackrefs.begin(); it!= trackrefs.end(); ++it){
     Candidate::LorentzVector temp ( (*it)->px(),(*it)->py(),(*it)->pz(), ParticleMasses::piPlus );
     mother += temp;
   }
 
   //   check if criteria for merging are fulfilled
   if(vertexDeltaR<maxDRForUnique && mother.M()<maxvecSumIMCUTForUnique && cosPA>minCosPAtomerge && std::abs(ptrel)<maxPtreltomerge ) {
 
     // add tracks of second vertex which are missing to first vertex
     // loop over the second
     const std::vector<reco::CandidatePtr> & tracks1 = sv1.daughterPtrVector();
     const std::vector<reco::CandidatePtr> & tracks2 = sv2.daughterPtrVector();
     for(std::vector<reco::CandidatePtr>::const_iterator ti = tracks2.begin(); ti!=tracks2.end(); ++ti){
       std::vector<reco::CandidatePtr>::const_iterator it = find(tracks1.begin(), tracks1.end(), *ti);
       if (it==tracks1.end()) {
         coll[i].vert.addDaughter( *ti );
         coll[i].vert.setP4( (*ti)->p4() + coll[i].vert.p4() );
       }
     }
 
     // remove the second vertex from the collection
     coll.erase( coll.begin() + k  );
   }
 }

Friends And Related Function Documentation

template<typename VTX >

bool operator<	(	VertexProxy	v1,
		VertexProxy	v2
	)

friend

Definition at line 66 of file BtoCharmDecayVertexMerger.cc.

                                                             {
          if(v1.ntracks>2 && v2.ntracks<3) return true;
          if(v1.ntracks<3 && v2.ntracks>2) return false;
          return (v1.invm>v2.invm);
        }