#include <HIPixelClusterVtxProducer.h>

Inheritance diagram for HIPixelClusterVtxProducer:

Classes
struct	VertexHit

Public Member Functions
	HIPixelClusterVtxProducer (const edm::ParameterSet &ps)

	~HIPixelClusterVtxProducer ()

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 Member Functions
int	getContainedHits (const std::vector< VertexHit > &hits, double z0, double &chi)

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

Private Attributes
double	maxZ_

double	minZ_

std::string	srcPixels_

double	zStep_

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

Definition at line 11 of file HIPixelClusterVtxProducer.h.

Constructor & Destructor Documentation

HIPixelClusterVtxProducer::HIPixelClusterVtxProducer ( const edm::ParameterSet & ps )

explicit

Definition at line 32 of file HIPixelClusterVtxProducer.cc.

   : srcPixels_(ps.getParameter<std::string>("pixelRecHits")),
     minZ_(ps.getParameter<double>("minZ")),
     maxZ_(ps.getParameter<double>("maxZ")),
     zStep_(ps.getParameter<double>("zStep"))
 
 {
   // Constructor
   produces<reco::VertexCollection>();
 }

HIPixelClusterVtxProducer::~HIPixelClusterVtxProducer ( )

Definition at line 45 of file HIPixelClusterVtxProducer.cc.

 { 
   // Destructor
 }

Member Function Documentation

int HIPixelClusterVtxProducer::getContainedHits	(	const std::vector< VertexHit > &	hits,
		double	z0,
		double &	chi
	)

private

Definition at line 142 of file HIPixelClusterVtxProducer.cc.

References n, L1TEmulatorMonitor_cff::p, and hit::z.

Referenced by produce().

 {
   // Calculate number of hits contained in v-shaped window in cluster y-width vs. z-position.
   int n = 0;
   chi   = 0.;
 
   for(std::vector<VertexHit>::const_iterator hit = hits.begin(); hit!= hits.end(); hit++) {
     double p = 2 * fabs(hit->z - z0)/hit->r + 0.5; // FIXME
     if(TMath::Abs(p - hit->w) <= 1.) { 
       chi += fabs(p - hit->w);
       n++;
     }
   }
   return n;
 }

void HIPixelClusterVtxProducer::produce	(	edm::Event &	ev,
		const edm::EventSetup &	es
	)

privatevirtual

Implements edm::EDProducer.

Definition at line 52 of file HIPixelClusterVtxProducer.cc.

References edmNew::DetSetVector< T >::data(), end, edm::EventSetup::get(), edm::Event::getByLabel(), getContainedHits(), TrackerGeometry::idToDet(), PixelTopology::isItEdgePixelInX(), PixelTopology::isItEdgePixelInY(), edm::HandleBase::isValid(), LogTrace, maxZ_, minZ_, PixelSubdetector::PixelBarrel, edm::Handle< T >::product(), edm::ESHandle< class >::product(), edm::Event::put(), HIPixelClusterVtxProducer::VertexHit::r, PixelGeomDetUnit::specificTopology(), srcPixels_, GeomDet::toGlobal(), HIPixelClusterVtxProducer::VertexHit::w, hit::x, hit::y, HIPixelClusterVtxProducer::VertexHit::z, hit::z, and zStep_.

 {
 
   // new vertex collection
   std::auto_ptr<reco::VertexCollection> vertices(new reco::VertexCollection);
 
   // get pixel rechits
   edm::Handle<SiPixelRecHitCollection> hRecHits;
   try {
     ev.getByLabel(edm::InputTag(srcPixels_),hRecHits);
   } catch (...) {}
 
   // get tracker geometry
   if (hRecHits.isValid()) {
     edm::ESHandle<TrackerGeometry> trackerHandle;
     es.get<TrackerDigiGeometryRecord>().get(trackerHandle);
     const TrackerGeometry *tgeo = trackerHandle.product();
     const SiPixelRecHitCollection *hits = hRecHits.product();
 
     // loop over pixel rechits
     std::vector<VertexHit> vhits;
     for(SiPixelRecHitCollection::DataContainer::const_iterator hit = hits->data().begin(), 
           end = hits->data().end(); hit != end; ++hit) {
       if (!hit->isValid())
         continue;
       DetId id(hit->geographicalId());
       if(id.subdetId() != int(PixelSubdetector::PixelBarrel))
         continue;
       const PixelGeomDetUnit *pgdu = static_cast<const PixelGeomDetUnit*>(tgeo->idToDet(id));
       if (1) {
     const PixelTopology *pixTopo = &(pgdu->specificTopology());
         std::vector<SiPixelCluster::Pixel> pixels(hit->cluster()->pixels());
         bool pixelOnEdge = false;
         for(std::vector<SiPixelCluster::Pixel>::const_iterator pixel = pixels.begin(); 
             pixel != pixels.end(); ++pixel) {
           int pixelX = pixel->x;
           int pixelY = pixel->y;
           if(pixTopo->isItEdgePixelInX(pixelX) || pixTopo->isItEdgePixelInY(pixelY)) {
             pixelOnEdge = true;
             break;
           }
         }
         if (pixelOnEdge)
           continue;
       }
 
       LocalPoint lpos = LocalPoint(hit->localPosition().x(),
                    hit->localPosition().y(),
                    hit->localPosition().z());
       GlobalPoint gpos = pgdu->toGlobal(lpos);
       VertexHit vh;
       vh.z = gpos.z(); 
       vh.r = gpos.perp(); 
       vh.w = hit->cluster()->sizeY();
       vhits.push_back(vh);
     }
     
     // estimate z-position from cluster lengths
     double zest = 0.0;
     int nhits = 0, nhits_max = 0;
     double chi = 0, chi_max = 1e+9;
     for(double z0 = minZ_; z0 <= maxZ_; z0 += zStep_) {
       nhits = getContainedHits(vhits, z0, chi);
       if(nhits == 0) 
     continue;
       if(nhits > nhits_max) { 
     chi_max = 1e+9; 
     nhits_max = nhits; 
       }
       if(nhits >= nhits_max && chi < chi_max) {
     chi_max = chi; 
     zest = z0;   
       }
     } 
 
     LogTrace("MinBiasTracking")
       << "  [vertex position] estimated = " << zest 
       << " | pixel barrel hits = " << vhits.size();
 
     // put 1-d vertex and dummy errors into collection
     reco::Vertex::Error err;
     err(2,2) = 0.6 * 0.6;
     reco::Vertex ver(reco::Vertex::Point(0,0,zest), err, 0, 1, 1);
     vertices->push_back(ver);
   }
 
   ev.put(vertices);
 }