#include <PixelVertexFinding/interface/PixelVertexProducer.h>

Inheritance diagram for PixelVertexProducer:

Public Member Functions
	PixelVertexProducer (const edm::ParameterSet &)

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

	~PixelVertexProducer ()

Public Member Functions inherited from edm::EDProducer
	EDProducer ()

virtual	~EDProducer ()

Public Member Functions inherited from edm::ProducerBase
	ProducerBase ()

void	registerProducts (ProducerBase , ProductRegistry , ModuleDescription const &)

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

virtual	~ProducerBase ()

Private Attributes
edm::ParameterSet	conf_

DivisiveVertexFinder *	dvf_

double	ptMin_

int	verbose_

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

typedef WorkerT< EDProducer >	WorkerType

Public Types inherited from edm::ProducerBase
typedef ProductRegistryHelper::TypeLabelList	TypeLabelList

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

static void	fillDescriptions (ConfigurationDescriptions &descriptions)

Protected Member Functions inherited from edm::EDProducer
CurrentProcessingContext const *	currentContext () const

Protected Member Functions inherited from edm::ProducerBase
template<class TProducer , class TMethod >
void	callWhenNewProductsRegistered (TProducer *iProd, TMethod iMethod)

Detailed Description

Description: This produces 1D (z only) primary vertexes using only pixel information.

Implementation: This producer can use either the Divisive Primary Vertex Finder or the Histogramming Primary Vertex Finder (currently not implemented). It relies on the PixelTripletProducer and PixelTrackProducer having already been run upstream. This is code ported from ORCA originally written by S Cucciarelli, M Konecki, D Kotlinski.

Definition at line 34 of file PixelVertexProducer.h.

Constructor & Destructor Documentation

PixelVertexProducer::PixelVertexProducer ( const edm::ParameterSet & conf )

explicit

Definition at line 13 of file PixelVertexProducer.cc.

References conf_, dvf_, edm::ParameterSet::getParameter(), ptMin_, and verbose_.

   : conf_(conf), verbose_(0), dvf_(0), ptMin_(1.0)
 {
   // Register my product
   produces<reco::VertexCollection>();
 
   // Setup shop
   verbose_           = conf.getParameter<int>("Verbosity"); // 0 silent, 1 chatty, 2 loud
   std::string finder = conf.getParameter<std::string>("Finder"); // DivisiveVertexFinder
   bool useError      = conf.getParameter<bool>("UseError"); // true
   bool wtAverage     = conf.getParameter<bool>("WtAverage"); // true
   double zOffset     = conf.getParameter<double>("ZOffset"); // 5.0 sigma
   double zSeparation = conf.getParameter<double>("ZSeparation"); // 0.05 cm
   int ntrkMin        = conf.getParameter<int>("NTrkMin"); // 3
   // Tracking requirements before sending a track to be considered for vtx
   ptMin_ = conf_.getParameter<double>("PtMin"); // 1.0 GeV
 
   if (finder == "DivisiveVertexFinder") {
     if (verbose_ > 0) edm::LogInfo("PixelVertexProducer") << ": Using the DivisiveVertexFinder\n";
     dvf_ = new DivisiveVertexFinder(zOffset, ntrkMin, useError, zSeparation, wtAverage, verbose_);
   }
   else { // Finder not supported, or you made a mistake in your request
     // throw an exception once I figure out how CMSSW does this
   }
 }

PixelVertexProducer::~PixelVertexProducer ( )

Definition at line 40 of file PixelVertexProducer.cc.

References dvf_.

                                           {
   delete dvf_;
 }

Member Function Documentation

void PixelVertexProducer::produce	(	edm::Event &	e,
		const edm::EventSetup &	es
	)

virtual

Implements edm::EDProducer.

Definition at line 44 of file PixelVertexProducer.cc.

References reco::Vertex::add(), conf_, dvf_, reco::BeamSpot::dxdz(), reco::BeamSpot::dydz(), error, DivisiveVertexFinder::findVertexes(), DivisiveVertexFinder::findVertexesAlt(), edm::Event::getByLabel(), edm::ParameterSet::getParameter(), i, edm::HandleBase::isValid(), convertSQLiteXML::ok, edm::Handle< T >::product(), ptMin_, edm::RefVector< C, T, F >::push_back(), edm::Event::put(), edm::RefVector< C, T, F >::size(), mathSSE::sqrt(), testEve_cfg::tracks, v, verbose_, x, reco::BeamSpot::x0(), detailsBasic3DVector::y, reco::BeamSpot::y0(), detailsBasic3DVector::z, and reco::BeamSpot::z0().

                                                                       {
 
   // First fish the pixel tracks out of the event
   edm::Handle<reco::TrackCollection> trackCollection;
   edm::InputTag trackCollName = conf_.getParameter<edm::InputTag>("TrackCollection");
   e.getByLabel(trackCollName,trackCollection);
   const reco::TrackCollection tracks = *(trackCollection.product());
   if (verbose_ > 0) edm::LogInfo("PixelVertexProducer") << ": Found " << tracks.size() << " tracks in TrackCollection called " << trackCollName << "\n";
   
 
   // Second, make a collection of pointers to the tracks we want for the vertex finder
   reco::TrackRefVector trks;
   for (unsigned int i=0; i<tracks.size(); i++) {
     if (tracks[i].pt() > ptMin_)     
       trks.push_back( reco::TrackRef(trackCollection, i) );
   }
   if (verbose_ > 0) edm::LogInfo("PixelVertexProducer") << ": Selected " << trks.size() << " of these tracks for vertexing\n";
 
   edm::Handle<reco::BeamSpot> bsHandle;
   edm::InputTag bsName = conf_.getParameter<edm::InputTag>("beamSpot");
   e.getByLabel(bsName,bsHandle);
   math::XYZPoint myPoint(0.,0.,0.);
   if (bsHandle.isValid()) myPoint = math::XYZPoint(bsHandle->x0(),bsHandle->y0(), 0. ); //FIXME: fix last coordinate with vertex.z() at same time
 
   // Third, ship these tracks off to be vertexed
   std::auto_ptr<reco::VertexCollection> vertexes(new reco::VertexCollection);
   bool ok;
   if (conf_.getParameter<bool>("Method2")) {
     ok = dvf_->findVertexesAlt(trks,       // input
                  *vertexes,myPoint); // output
     if (verbose_ > 0) edm::LogInfo("PixelVertexProducer") << "Method2 returned status of " << ok;
   }
   else {
     ok = dvf_->findVertexes(trks,       // input
                 *vertexes); // output
     if (verbose_ > 0) edm::LogInfo("PixelVertexProducer") << "Method1 returned status of " << ok;
   }
 
   if (verbose_ > 0) {
     edm::LogInfo("PixelVertexProducer") << ": Found " << vertexes->size() << " vertexes\n";
     for (unsigned int i=0; i<vertexes->size(); ++i) {
       edm::LogInfo("PixelVertexProducer") << "Vertex number " << i << " has " << (*vertexes)[i].tracksSize() << " tracks with a position of " << (*vertexes)[i].z() << " +- " << std::sqrt( (*vertexes)[i].covariance(2,2) );
     }
   }
 
 
   if(bsHandle.isValid())
    {
     const reco::BeamSpot & bs = *bsHandle;
 
     for (unsigned int i=0; i<vertexes->size(); ++i) {
       double z=(*vertexes)[i].z();
       double x=bs.x0()+bs.dxdz()*(z-bs.z0());
       double y=bs.y0()+bs.dydz()*(z-bs.z0()); 
       reco::Vertex v( reco::Vertex::Point(x,y,z), (*vertexes)[i].error(),(*vertexes)[i].chi2() , (*vertexes)[i].ndof() , (*vertexes)[i].tracksSize());
        //Copy also the tracks 
        for (std::vector<reco::TrackBaseRef >::const_iterator it = (*vertexes)[i].tracks_begin();
             it !=(*vertexes)[i].tracks_end(); it++) {
             v.add( *it );
        }
       (*vertexes)[i]=v;
 
     }
   }
    else
   {
       edm::LogWarning("PixelVertexProducer") << "No beamspot found. Using returning vertexes with (0,0,Z) ";
   } 
 
   e.put(vertexes);
 }