#include <HIPixelClusterVtxProducer.h>

Inheritance diagram for HIPixelClusterVtxProducer:

Classes
struct	VertexHit

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

	~HIPixelClusterVtxProducer () override

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

bool	hasAbilityToProduceInBeginLumis () const final

bool	hasAbilityToProduceInBeginRuns () const final

bool	hasAbilityToProduceInEndLumis () const final

bool	hasAbilityToProduceInEndRuns () const final

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

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

Private Attributes
double	maxZ_

double	minZ_

edm::EDGetTokenT< SiPixelRecHitCollection >	srcPixels_

std::string	srcPixelsString_

double	zStep_

Additional Inherited Members
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

Detailed Description

Definition at line 17 of file HIPixelClusterVtxProducer.h.

Constructor & Destructor Documentation

◆ HIPixelClusterVtxProducer()

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

explicit

Definition at line 28 of file HIPixelClusterVtxProducer.cc.

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

References srcPixels_, and srcPixelsString_.

◆ ~HIPixelClusterVtxProducer()

HIPixelClusterVtxProducer::~HIPixelClusterVtxProducer ( )

override

Definition at line 41 of file HIPixelClusterVtxProducer.cc.

                                                       {
   // Destructor
 }

Member Function Documentation

◆ getContainedHits()

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

private

Definition at line 130 of file HIPixelClusterVtxProducer.cc.

                                                                                                         {
   // 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;
 }

References Abs(), hfClusterShapes_cfi::hits, dqmiodumpmetadata::n, AlCaHLTBitMon_ParallelJobs::p, hit::z, and HLTMuonOfflineAnalyzer_cfi::z0.

Referenced by produce().

◆ produce()

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

overrideprivate

Definition at line 46 of file HIPixelClusterVtxProducer.cc.

                                                                              {
   // new vertex collection
   auto vertices = std::make_unique<reco::VertexCollection>();
  
   // get pixel rechits
   edm::Handle<SiPixelRecHitCollection> hRecHits;
   ev.getByToken(srcPixels_, hRecHits);
  
   // 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 (true) {
         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(std::move(vertices));
 }