#include <RecoVertex/KineExample/src/KineExample.cc>

Inheritance diagram for KineExample:

Public Member Functions
void	analyze (const edm::Event &, const edm::EventSetup &) override

void	beginRun (edm::Run const &, edm::EventSetup const &) override

void	endJob () override

	KineExample (const edm::ParameterSet &)

	~KineExample () override

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

	EDAnalyzer ()

SerialTaskQueue *	globalLuminosityBlocksQueue ()

SerialTaskQueue *	globalRunsQueue ()

ModuleDescription const &	moduleDescription () const

std::string	workerType () const

	~EDAnalyzer () override

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

ESProxyIndex const *	esGetTokenIndices (edm::Transition iTrans) const

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

ProductResolverIndexAndSkipBit	uncheckedIndexFrom (EDGetToken) const

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

void	updateLookup (eventsetup::ESRecordsToProxyIndices const &)

virtual	~EDConsumerBase () noexcept(false)

Private Member Functions
TrackingVertex	getSimVertex (const edm::Event &iEvent) const

void	printout (const RefCountedKinematicVertex &myVertex) const

void	printout (const RefCountedKinematicParticle &myParticle) const

void	printout (const RefCountedKinematicTree &myTree) const

Private Attributes
edm::ParameterSet	kvfPSet

std::string	outputFile_

edm::ParameterSet	theConfig

edm::EDGetTokenT< reco::TrackCollection >	token_tracks

edm::EDGetTokenT< TrackingVertexCollection >	token_VertexTruth

Additional Inherited Members
Public Types inherited from edm::EDAnalyzer
typedef EDAnalyzer	ModuleType

Public Types inherited from edm::EDConsumerBase
typedef ProductLabels	Labels

Static Public Member Functions inherited from edm::EDAnalyzer
static const std::string &	baseType ()

static void	fillDescriptions (ConfigurationDescriptions &descriptions)

static void	prevalidate (ConfigurationDescriptions &)

static bool	wantsGlobalLuminosityBlocks ()

static bool	wantsGlobalRuns ()

static bool	wantsStreamLuminosityBlocks ()

static bool	wantsStreamRuns ()

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 ESProduct , typename ESRecord , Transition Tr = Transition::Event>
auto	esConsumes ()

template<typename ESProduct , typename ESRecord , Transition Tr = Transition::Event>
auto	esConsumes (ESInputTag const &tag)

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

This is a very simple test analyzer mean to test the KalmanVertexFitter

Description: steers tracker primary vertex reconstruction and storage

Implementation: <Notes on="" implementation>="">

Definition at line 38 of file KineExample.h.

Constructor & Destructor Documentation

KineExample::KineExample ( const edm::ParameterSet & iConfig )

explicit

Definition at line 36 of file KineExample.cc.

References edm::ParameterSet::getParameter(), edm::ParameterSet::getUntrackedParameter(), HLT_2018_cff::InputTag, kvfPSet, outputFile_, AlCaHLTBitMon_QueryRunRegistry::string, token_tracks, and token_VertexTruth.

                                                        : theConfig(iConfig) {
   token_tracks = consumes<TrackCollection>(iConfig.getParameter<string>("TrackLabel"));
   outputFile_ = iConfig.getUntrackedParameter<std::string>("outputFile");
   kvfPSet = iConfig.getParameter<edm::ParameterSet>("KVFParameters");
   //   rootFile_ = TFile::Open(outputFile_.c_str(),"RECREATE");
   edm::LogInfo("RecoVertex/KineExample") << "Initializing KVF TEST analyser  - Output file: " << outputFile_ << "\n";
   //   token_TrackTruth = consumes<TrackingParticleCollection>(edm::InputTag("trackingtruth", "TrackTruth"));
   token_VertexTruth = consumes<TrackingVertexCollection>(edm::InputTag("trackingtruth", "VertexTruth"));
 }

KineExample::~KineExample ( )

override

Definition at line 46 of file KineExample.cc.

                           {
   //   delete rootFile_;
 }

Member Function Documentation

void KineExample::analyze	(	const edm::Event &	iEvent,
		const edm::EventSetup &	iSetup
	)

override

Definition at line 62 of file KineExample.cc.

References gather_cfg::cout, runTheMatrix::err, cppFunctionSkipper::exception, KinematicConstrainedVertexFitter::fit(), KinematicParticleFitter::fit(), KinematicParticleVertexFitter::fit(), edm::EventSetup::get(), edm::Event::getByToken(), edm::EventBase::id(), edm::HandleBase::isValid(), TransientVertex::isValid(), jpsi, KinematicParticleFactoryFromTransientTrack::particle(), TransientVertex::position(), printout(), token_tracks, and KalmanVertexFitter::vertex().

                                                                              {
   try {
     cout << "Reconstructing event number: " << iEvent.id() << "\n";
 
     // get RECO tracks from the event
     // `tks` can be used as a ptr to a reco::TrackCollection
     edm::Handle<reco::TrackCollection> tks;
     iEvent.getByToken(token_tracks, tks);
     if (!tks.isValid()) {
       cout << "Couln't find track collection: " << iEvent.id() << "\n";
     } else {
       edm::LogInfo("RecoVertex/KineExample") << "Found: " << (*tks).size() << " reconstructed tracks"
                                              << "\n";
       cout << "got " << (*tks).size() << " tracks " << endl;
 
       // Transform Track to TransientTrack
       //get the builder:
       edm::ESHandle<TransientTrackBuilder> theB;
       iSetup.get<TransientTrackRecord>().get("TransientTrackBuilder", theB);
       //do the conversion:
       vector<TransientTrack> t_tks = (*theB).build(tks);
 
       cout << "Found: " << t_tks.size() << " reconstructed tracks"
            << "\n";
 
       // Do a KindFit, if >= 4 tracks.
       if (t_tks.size() > 3) {
         // For a first test, suppose that the first four tracks are the 2 muons,
         // then the 2 kaons. Since this will not be true, the result of the fit
         // will not be meaningfull, but at least you will get the idea of how to
         // do such a fit.
 
         //First, to get started, a simple vertex fit:
 
         vector<TransientTrack> ttv;
         ttv.push_back(t_tks[0]);
         ttv.push_back(t_tks[1]);
         ttv.push_back(t_tks[2]);
         ttv.push_back(t_tks[3]);
         KalmanVertexFitter kvf(false);
         TransientVertex tv = kvf.vertex(ttv);
         if (!tv.isValid())
           cout << "KVF failed\n";
         else
           std::cout << "KVF fit Position: " << Vertex::Point(tv.position()) << "\n";
 
         TransientTrack ttMuPlus = t_tks[0];
         TransientTrack ttMuMinus = t_tks[1];
         TransientTrack ttKPlus = t_tks[2];
         TransientTrack ttKMinus = t_tks[3];
 
         //the final state muons and kaons from the Bs->J/PsiPhi->mumuKK decay
         //Creating a KinematicParticleFactory
         KinematicParticleFactoryFromTransientTrack pFactory;
 
         //The mass of a muon and the insignificant mass sigma to avoid singularities in the covariance matrix.
         ParticleMass muon_mass = 0.1056583;
         ParticleMass kaon_mass = 0.493677;
         float muon_sigma = 0.0000001;
         float kaon_sigma = 0.000016;
 
         //initial chi2 and ndf before kinematic fits. The chi2 of the reconstruction is not considered
         float chi = 0.;
         float ndf = 0.;
 
         //making particles
         vector<RefCountedKinematicParticle> muonParticles;
         vector<RefCountedKinematicParticle> phiParticles;
         vector<RefCountedKinematicParticle> allParticles;
         muonParticles.push_back(pFactory.particle(ttMuPlus, muon_mass, chi, ndf, muon_sigma));
         muonParticles.push_back(pFactory.particle(ttMuMinus, muon_mass, chi, ndf, muon_sigma));
         allParticles.push_back(pFactory.particle(ttMuPlus, muon_mass, chi, ndf, muon_sigma));
         allParticles.push_back(pFactory.particle(ttMuMinus, muon_mass, chi, ndf, muon_sigma));
 
         phiParticles.push_back(pFactory.particle(ttKPlus, kaon_mass, chi, ndf, kaon_sigma));
         phiParticles.push_back(pFactory.particle(ttKMinus, kaon_mass, chi, ndf, kaon_sigma));
         allParticles.push_back(pFactory.particle(ttKPlus, kaon_mass, chi, ndf, kaon_sigma));
         allParticles.push_back(pFactory.particle(ttKMinus, kaon_mass, chi, ndf, kaon_sigma));
 
         /* Example of a simple vertex fit, without other constraints
        * The reconstructed decay tree is a result of the kinematic fit
        * The KinematicParticleVertexFitter fits the final state particles to their vertex and
        * reconstructs the decayed state
        */
         KinematicParticleVertexFitter fitter;
         cout << "Simple vertex fit with KinematicParticleVertexFitter:\n";
         RefCountedKinematicTree vertexFitTree = fitter.fit(allParticles);
 
         printout(vertexFitTree);
 
 
         //creating the constraint for the J/Psi mass
         ParticleMass jpsi = 3.09687;
 
         //creating the two track mass constraint
         MultiTrackKinematicConstraint* j_psi_c = new TwoTrackMassKinematicConstraint(jpsi);
 
         //creating the fitter
         KinematicConstrainedVertexFitter kcvFitter;
 
         //obtaining the resulting tree
         RefCountedKinematicTree myTree = kcvFitter.fit(allParticles, j_psi_c);
 
         cout << "\nGlobal fit done:\n";
         printout(myTree);
 
         //creating the vertex fitter
         KinematicParticleVertexFitter kpvFitter;
 
         //reconstructing a J/Psi decay
         RefCountedKinematicTree jpTree = kpvFitter.fit(muonParticles);
 
         //creating the particle fitter
         KinematicParticleFitter csFitter;
 
         // creating the constraint
         float jp_m_sigma = 0.00004;
         KinematicConstraint* jpsi_c2 = new MassKinematicConstraint(jpsi, jp_m_sigma);
 
         //the constrained fit:
         jpTree = csFitter.fit(jpsi_c2, jpTree);
 
         //getting the J/Psi KinematicParticle and putting it together with the kaons.
         //The J/Psi KinematicParticle has a pointer to the tree it belongs to
         jpTree->movePointerToTheTop();
         RefCountedKinematicParticle jpsi_part = jpTree->currentParticle();
         phiParticles.push_back(jpsi_part);
 
         //making a vertex fit and thus reconstructing the Bs parameters
         // the resulting tree includes all the final state tracks, the J/Psi meson,
         // its decay vertex, the Bs meson and its decay vertex.
         RefCountedKinematicTree bsTree = kpvFitter.fit(phiParticles);
         cout << "Sequential fit done:\n";
         printout(bsTree);
 
         //       // For the analysis: compare to your SimVertex
         //       TrackingVertex sv = getSimVertex(iEvent);
         //   edm::Handle<TrackingParticleCollection>  TPCollectionH ;
         //   iEvent.getByToken(token_TrackTruth, TPCollectionH);
         //   const TrackingParticleCollection tPC = *(TPCollectionH.product());
         //       reco::RecoToSimCollection recSimColl=associatorForParamAtPca->associateRecoToSim(tks,
         //                                        TPCollectionH,
         //                                        &iEvent,
         //                                                                            &iSetup);
         //
         //       tree->fill(tv, &sv, &recSimColl);
         //     }
       }
     }
 
   } catch (std::exception& err) {
     cout << "Exception during event number: " << iEvent.id() << "\n" << err.what() << "\n";
   }
 }

void KineExample::beginRun	(	edm::Run const &	run,
		edm::EventSetup const &	setup
	)

overridevirtual

Reimplemented from edm::EDAnalyzer.

Definition at line 50 of file KineExample.cc.

                                                                   {
   //   edm::ESHandle<MagneticField> magField;
   //   setup.get<IdealMagneticFieldRecord>().get(magField);
   //   tree.reset(new SimpleVertexTree("VertexFitter", magField.product()));
 }

void KineExample::endJob ( void )

overridevirtual

Reimplemented from edm::EDAnalyzer.

Definition at line 56 of file KineExample.cc.

56 {}

TrackingVertex KineExample::getSimVertex ( const edm::Event & iEvent ) const

private

Definition at line 274 of file KineExample.cc.

References DEFINE_FWK_MODULE, edm::Event::getByToken(), edm::Handle< T >::product(), and token_VertexTruth.

                                                                      {
   // get the simulated vertices
   edm::Handle<TrackingVertexCollection> TVCollectionH;
   iEvent.getByToken(token_VertexTruth, TVCollectionH);
   const TrackingVertexCollection tPC = *(TVCollectionH.product());
 
   //    Handle<edm::SimVertexContainer> simVtcs;
   //    iEvent.getByLabel("g4SimHits", simVtcs);
   //    std::cout << "SimVertex " << simVtcs->size() << std::endl;
   //    for(edm::SimVertexContainer::const_iterator v=simVtcs->begin();
   //        v!=simVtcs->end(); ++v){
   //      std::cout << "simvtx "
   //           << v->position().x() << " "
   //           << v->position().y() << " "
   //           << v->position().z() << " "
   //           << v->parentIndex() << " "
   //           << v->noParent() << " "
   //               << std::endl;
   //    }
   return *(tPC.begin());
 }

void KineExample::printout ( const RefCountedKinematicVertex & myVertex ) const

private

Definition at line 218 of file KineExample.cc.

References gather_cfg::cout.

Referenced by analyze(), and printout().

                                                                           {
   if (myVertex->vertexIsValid()) {
     cout << "Decay vertex: " << myVertex->position() << myVertex->chiSquared() << " " << myVertex->degreesOfFreedom()
          << endl;
   } else
     cout << "Decay vertex Not valid\n";
 }

void KineExample::printout ( const RefCountedKinematicParticle & myParticle ) const

private

Definition at line 226 of file KineExample.cc.

References gather_cfg::cout.

                                                                               {
   cout << "Particle: \n";
   //accessing the reconstructed Bs meson parameters:
   //SK: uncomment if needed  AlgebraicVector7 bs_par = myParticle->currentState().kinematicParameters().vector();
 
   //and their joint covariance matrix:
   //SK:uncomment if needed  AlgebraicSymMatrix77 bs_er = myParticle->currentState().kinematicParametersError().matrix();
   cout << "Momentum at vertex: " << myParticle->currentState().globalMomentum() << endl;
   cout << "Parameters at vertex: " << myParticle->currentState().kinematicParameters().vector() << endl;
 }

void KineExample::printout ( const RefCountedKinematicTree & myTree ) const

private

Definition at line 237 of file KineExample.cc.

References gather_cfg::cout, mps_fire::i, and printout().

                                                                       {
   if (!myTree->isValid()) {
     cout << "Tree is invalid. Fit failed.\n";
     return;
   }
 
   //accessing the tree components, move pointer to top
   myTree->movePointerToTheTop();
 
   //We are now at the top of the decay tree getting the B_s reconstructed KinematicPartlcle
   RefCountedKinematicParticle b_s = myTree->currentParticle();
   printout(b_s);
 
   // The B_s decay vertex
   RefCountedKinematicVertex b_dec_vertex = myTree->currentDecayVertex();
   printout(b_dec_vertex);
 
   // Get all the children of Bs:
   //In this way, the pointer is not moved
   vector<RefCountedKinematicParticle> bs_children = myTree->finalStateParticles();
 
   for (unsigned int i = 0; i < bs_children.size(); ++i) {
     printout(bs_children[i]);
   }
 
   //Now navigating down the tree , pointer is moved:
   bool child = myTree->movePointerToTheFirstChild();
 
   if (child)
     while (myTree->movePointerToTheNextChild()) {
       RefCountedKinematicParticle aChild = myTree->currentParticle();
       printout(aChild);
     }
 }