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File indexing completed on 2021-02-14 13:34:41

0001 //
0002 // Derived from HLTrigger/special/src/HLTPixelClusterShapeFilter.cc
0003 // at version 7_5_0_pre3
0004 //
0005 // Original Author (of Derivative Producer):  Eric Appelt
0006 //         Created:  Mon Apr 27, 2015
0007 
0008 #include <iostream>
0009 
0010 #include "FWCore/Framework/interface/Frameworkfwd.h"
0011 #include "FWCore/Framework/interface/stream/EDProducer.h"
0012 #include "FWCore/Framework/interface/Event.h"
0013 #include "FWCore/Framework/interface/EventSetup.h"
0014 #include "FWCore/Framework/interface/ESHandle.h"
0015 #include "FWCore/Framework/interface/MakerMacros.h"
0016 #include "FWCore/ParameterSet/interface/ParameterSet.h"
0017 #include "FWCore/MessageLogger/interface/MessageLogger.h"
0018 #include "FWCore/Utilities/interface/ESGetToken.h"
0019 
0020 #include "DataFormats/Common/interface/Handle.h"
0021 #include "DataFormats/GeometryVector/interface/LocalPoint.h"
0022 #include "DataFormats/GeometryVector/interface/GlobalPoint.h"
0023 #include "DataFormats/SiPixelDetId/interface/PixelSubdetector.h"
0024 #include "DataFormats/TrackerRecHit2D/interface/SiPixelRecHitCollection.h"
0025 #include "DataFormats/HeavyIonEvent/interface/ClusterCompatibility.h"
0026 
0027 #include "Geometry/TrackerGeometryBuilder/interface/TrackerGeometry.h"
0028 #include "Geometry/CommonDetUnit/interface/PixelGeomDetUnit.h"
0029 #include "Geometry/CommonTopologies/interface/PixelTopology.h"
0030 #include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
0031 #include "Geometry/CommonDetUnit/interface/GeomDet.h"
0032 
0033 //
0034 // class declaration
0035 //
0036 
0037 class ClusterCompatibilityProducer : public edm::stream::EDProducer<> {
0038 public:
0039   explicit ClusterCompatibilityProducer(const edm::ParameterSet &);
0040   ~ClusterCompatibilityProducer() override;
0041 
0042   void produce(edm::Event &, const edm::EventSetup &) override;
0043 
0044 private:
0045   edm::EDGetTokenT<SiPixelRecHitCollection> inputToken_;
0046   edm::ESGetToken<TrackerGeometry, TrackerDigiGeometryRecord> trackerToken_;
0047   edm::InputTag inputTag_;  // input tag identifying product containing pixel clusters
0048   double minZ_;             // beginning z-vertex position
0049   double maxZ_;             // end z-vertex position
0050   double zStep_;            // size of steps in z-vertex test
0051 
0052   struct VertexHit {
0053     float z;
0054     float r;
0055     float w;
0056   };
0057 
0058   struct ContainedHits {
0059     float z0;
0060     int nHit;
0061     float chi;
0062   };
0063 
0064   ContainedHits getContainedHits(const std::vector<VertexHit> &hits, double z0) const;
0065 };
0066 
0067 ClusterCompatibilityProducer::ClusterCompatibilityProducer(const edm::ParameterSet &config)
0068     : inputTag_(config.getParameter<edm::InputTag>("inputTag")),
0069       minZ_(config.getParameter<double>("minZ")),
0070       maxZ_(config.getParameter<double>("maxZ")),
0071       zStep_(config.getParameter<double>("zStep")) {
0072   inputToken_ = consumes<SiPixelRecHitCollection>(inputTag_);
0073   trackerToken_ = esConsumes<TrackerGeometry, TrackerDigiGeometryRecord>();
0074   LogDebug("") << "Using the " << inputTag_ << " input collection";
0075   produces<reco::ClusterCompatibility>();
0076 }
0077 
0078 ClusterCompatibilityProducer::~ClusterCompatibilityProducer() {}
0079 
0080 void ClusterCompatibilityProducer::produce(edm::Event &iEvent, const edm::EventSetup &iSetup) {
0081   auto creco = std::make_unique<reco::ClusterCompatibility>();
0082 
0083   // get hold of products from Event
0084   edm::Handle<SiPixelRecHitCollection> hRecHits;
0085   iEvent.getByToken(inputToken_, hRecHits);
0086 
0087   // get tracker geometry
0088   if (hRecHits.isValid()) {
0089     edm::ESHandle<TrackerGeometry> trackerHandle = iSetup.getHandle(trackerToken_);
0090     const TrackerGeometry *tgeo = trackerHandle.product();
0091     const SiPixelRecHitCollection *hits = hRecHits.product();
0092 
0093     // loop over pixel rechits
0094     int nPxlHits = 0;
0095     std::vector<VertexHit> vhits;
0096     for (SiPixelRecHitCollection::DataContainer::const_iterator hit = hits->data().begin(), end = hits->data().end();
0097          hit != end;
0098          ++hit) {
0099       if (!hit->isValid())
0100         continue;
0101       ++nPxlHits;
0102       DetId id(hit->geographicalId());
0103       if (id.subdetId() != int(PixelSubdetector::PixelBarrel))
0104         continue;
0105       const PixelGeomDetUnit *pgdu = static_cast<const PixelGeomDetUnit *>(tgeo->idToDet(id));
0106       const PixelTopology *pixTopo = &(pgdu->specificTopology());
0107       std::vector<SiPixelCluster::Pixel> pixels(hit->cluster()->pixels());
0108       bool pixelOnEdge = false;
0109       for (std::vector<SiPixelCluster::Pixel>::const_iterator pixel = pixels.begin(); pixel != pixels.end(); ++pixel) {
0110         int pixelX = pixel->x;
0111         int pixelY = pixel->y;
0112         if (pixTopo->isItEdgePixelInX(pixelX) || pixTopo->isItEdgePixelInY(pixelY)) {
0113           pixelOnEdge = true;
0114           break;
0115         }
0116       }
0117       if (pixelOnEdge)
0118         continue;
0119 
0120       LocalPoint lpos = LocalPoint(hit->localPosition().x(), hit->localPosition().y(), hit->localPosition().z());
0121       GlobalPoint gpos = pgdu->toGlobal(lpos);
0122       VertexHit vh;
0123       vh.z = gpos.z();
0124       vh.r = gpos.perp();
0125       vh.w = hit->cluster()->sizeY();
0126       vhits.push_back(vh);
0127     }
0128 
0129     creco->setNValidPixelHits(nPxlHits);
0130 
0131     // append cluster compatibility  for each z-position
0132     for (double z0 = minZ_; z0 <= maxZ_; z0 += zStep_) {
0133       ContainedHits c = getContainedHits(vhits, z0);
0134       creco->append(c.z0, c.nHit, c.chi);
0135     }
0136   }
0137   iEvent.put(std::move(creco));
0138 }
0139 
0140 ClusterCompatibilityProducer::ContainedHits ClusterCompatibilityProducer::getContainedHits(
0141     const std::vector<VertexHit> &hits, double z0) const {
0142   // Calculate number of hits contained in v-shaped window in cluster y-width vs. z-position.
0143   int n = 0;
0144   double chi = 0.;
0145 
0146   for (std::vector<VertexHit>::const_iterator hit = hits.begin(); hit != hits.end(); hit++) {
0147     // the calculation of the predicted cluster width p was
0148     // marked 'FIXME' in the HLTPixelClusterShapeFilter. It should
0149     // be revisited but is retained as it was for compatibility with the
0150     // older filter.
0151     double p = 2 * fabs(hit->z - z0) / hit->r + 0.5;
0152     if (fabs(p - hit->w) <= 1.) {
0153       chi += fabs(p - hit->w);
0154       n++;
0155     }
0156   }
0157   ClusterCompatibilityProducer::ContainedHits output;
0158   output.z0 = z0;
0159   output.nHit = n;
0160   output.chi = chi;
0161   return output;
0162 }
0163 
0164 //define this as a plug-in
0165 DEFINE_FWK_MODULE(ClusterCompatibilityProducer);