PixelVertexProducer Class Reference

Inheritance diagram for PixelVertexProducer:

Public Member Functions
	PixelVertexProducer (const edm::ParameterSet &)
void	produce (edm::Event &, const edm::EventSetup &) override
	~PixelVertexProducer () 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 Attributes
DivisiveVertexFinder *	dvf_
const bool	method2
const double	ptMin_
const edm::EDGetTokenT< reco::BeamSpot >	token_BeamSpot
const edm::EDGetTokenT< reco::TrackCollection >	token_Tracks
const edm::InputTag	trackCollName
const int	verbose_

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

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 41 of file PixelVertexProducer.cc.

Constructor & Destructor Documentation

PixelVertexProducer()

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

explicit

Definition at line 62 of file PixelVertexProducer.cc.

    : verbose_(conf.getParameter<int>("Verbosity")),
      // 1.0 GeV
      ptMin_(conf.getParameter<double>("PtMin")),
      method2(conf.getParameter<bool>("Method2")),
      trackCollName(conf.getParameter<edm::InputTag>("TrackCollection")),
      token_Tracks(consumes<reco::TrackCollection>(trackCollName)),
      token_BeamSpot(consumes<reco::BeamSpot>(conf.getParameter<edm::InputTag>("beamSpot"))) {
  // Register my product
  produces<reco::VertexCollection>();
 
  // Setup shop
  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
 
  double track_pt_min = ptMin_;
  double track_pt_max = 10.;
  double track_chi2_max = 9999999.;
  double track_prob_min = -1.;
 
  if (conf.exists("PVcomparer")) {
    edm::ParameterSet PVcomparerPSet = conf.getParameter<edm::ParameterSet>("PVcomparer");
    track_pt_min = PVcomparerPSet.getParameter<double>("track_pt_min");
    if (track_pt_min != ptMin_) {
      if (track_pt_min < ptMin_)
        edm::LogInfo("PixelVertexProducer")
            << "minimum track pT setting differs between PixelVertexProducer (" << ptMin_ << ") and PVcomparer ("
            << track_pt_min << ") [PVcomparer considers tracks w/ lower threshold than PixelVertexProducer does] !!!";
      else
        edm::LogInfo("PixelVertexProducer") << "minimum track pT setting differs between PixelVertexProducer ("
                                            << ptMin_ << ") and PVcomparer (" << track_pt_min << ") !!!";
    }
    track_pt_max = PVcomparerPSet.getParameter<double>("track_pt_max");
    track_chi2_max = PVcomparerPSet.getParameter<double>("track_chi2_max");
    track_prob_min = PVcomparerPSet.getParameter<double>("track_prob_min");
  }
 
  if (finder == "DivisiveVertexFinder") {
    if (verbose_ > 0)
      edm::LogInfo("PixelVertexProducer") << ": Using the DivisiveVertexFinder\n";
    dvf_ = new DivisiveVertexFinder(track_pt_min,
                                    track_pt_max,
                                    track_chi2_max,
                                    track_prob_min,
                                    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
  }
}

References dvf_, edm::ParameterSet::exists(), HLT_2018_cff::finder, edm::ParameterSet::getParameter(), ptMin_, AlCaHLTBitMon_QueryRunRegistry::string, HLT_2018_cff::track_chi2_max, HLT_2018_cff::track_prob_min, HLT_2018_cff::track_pt_max, HLT_2018_cff::track_pt_min, verbose_, and HLT_FULL_cff::zSeparation.

~PixelVertexProducer()

PixelVertexProducer::~PixelVertexProducer ( )

override

Definition at line 123 of file PixelVertexProducer.cc.

{ delete dvf_; }

References dvf_.

Member Function Documentation

produce()

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

override

Definition at line 125 of file PixelVertexProducer.cc.

                                                                      {
  // First fish the pixel tracks out of the event
  edm::Handle<reco::TrackCollection> trackCollection;
  e.getByToken(token_Tracks, 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;
  e.getByToken(token_BeamSpot, bsHandle);
  math::XYZPoint myPoint(0., 0., 0.);
  if (bsHandle.isValid())
    //FIXME: fix last coordinate with vertex.z() at same time
    myPoint = math::XYZPoint(bsHandle->x0(), bsHandle->y0(), 0.);
 
  // Third, ship these tracks off to be vertexed
  auto vertexes = std::make_unique<reco::VertexCollection>();
  bool ok;
  if (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) ";
  }
 
  if (vertexes->empty() && bsHandle.isValid()) {
    const reco::BeamSpot& bs = *bsHandle;
 
    GlobalError bse(bs.rotatedCovariance3D());
    if ((bse.cxx() <= 0.) || (bse.cyy() <= 0.) || (bse.czz() <= 0.)) {
      AlgebraicSymMatrix33 we;
      we(0, 0) = 10000;
      we(1, 1) = 10000;
      we(2, 2) = 10000;
      vertexes->push_back(reco::Vertex(bs.position(), we, 0., 0., 0));
 
      edm::LogInfo("PixelVertexProducer")
          << "No vertices found. Beamspot with invalid errors " << bse.matrix() << std::endl
          << "Will put Vertex derived from dummy-fake BeamSpot into Event.\n"
          << (*vertexes)[0].x() << "\n"
          << (*vertexes)[0].y() << "\n"
          << (*vertexes)[0].z() << "\n";
    } else {
      vertexes->push_back(reco::Vertex(bs.position(), bs.rotatedCovariance3D(), 0., 0., 0));
 
      edm::LogInfo("PixelVertexProducer") << "No vertices found. Will put Vertex derived from BeamSpot into Event:\n"
                                          << (*vertexes)[0].x() << "\n"
                                          << (*vertexes)[0].y() << "\n"
                                          << (*vertexes)[0].z() << "\n";
    }
  }
 
  else if (vertexes->empty() && !bsHandle.isValid()) {
    edm::LogWarning("PixelVertexProducer") << "No beamspot and no vertex found. No vertex returned.";
  }
 
  e.put(std::move(vertexes));
}

References cms::cuda::bs, hltPixelTracks_cff::chi2, dvf_, MillePedeFileConverter_cfg::e, relativeConstraints::error, DivisiveVertexFinder::findVertexes(), DivisiveVertexFinder::findVertexesAlt(), mps_fire::i, edm::HandleBase::isValid(), method2, eostools::move(), ndof, convertSQLiteXML::ok, DiDispStaMuonMonitor_cfi::pt, ptMin_, edm::RefVector< C, T, F >::push_back(), edm::RefVector< C, T, F >::size(), mathSSE::sqrt(), token_BeamSpot, token_Tracks, duplicaterechits_cfi::trackCollection, trackCollName, PDWG_EXOHSCP_cff::tracks, findQualityFiles::v, verbose_, jets_cff::vertexes, x, reco::BeamSpot::x0(), y, reco::BeamSpot::y0(), and z.

Member Data Documentation

dvf_

DivisiveVertexFinder* PixelVertexProducer::dvf_

private

Definition at line 59 of file PixelVertexProducer.cc.

Referenced by PixelVertexProducer(), produce(), and ~PixelVertexProducer().

method2

const bool PixelVertexProducer::method2

private

Definition at line 54 of file PixelVertexProducer.cc.

Referenced by produce().

ptMin_

const double PixelVertexProducer::ptMin_

private

Definition at line 53 of file PixelVertexProducer.cc.

Referenced by PixelVertexProducer(), and produce().

token_BeamSpot

const edm::EDGetTokenT<reco::BeamSpot> PixelVertexProducer::token_BeamSpot

private

Definition at line 57 of file PixelVertexProducer.cc.

Referenced by produce().

token_Tracks

const edm::EDGetTokenT<reco::TrackCollection> PixelVertexProducer::token_Tracks

private

Definition at line 56 of file PixelVertexProducer.cc.

Referenced by produce().

trackCollName

const edm::InputTag PixelVertexProducer::trackCollName

private

Definition at line 55 of file PixelVertexProducer.cc.

Referenced by produce().

verbose_

const int PixelVertexProducer::verbose_

private

Definition at line 51 of file PixelVertexProducer.cc.

Referenced by PixelVertexProducer(), and produce().