RecoParticleFlow/PFTracking/interface/PFDisplacedVertexFinder.h - master - githubmirror/cmssw

RecoParticleFlow/PFTracking/interface/PFDisplacedVertexFinder.h
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03 июн 2019, 06:44
03 июн 2019, 06:447622cf3
#ifndef RecoParticleFlow_PFTracking_PFDisplacedVertexFinder_h
#define RecoParticleFlow_PFTracking_PFDisplacedVertexFinder_h

#include "RecoParticleFlow/PFTracking/interface/PFDisplacedVertexHelper.h"
#include "FWCore/Framework/interface/ESHandle.h"

#include "DataFormats/ParticleFlowReco/interface/PFDisplacedVertexCandidate.h"
#include "DataFormats/ParticleFlowReco/interface/PFDisplacedVertexCandidateFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFDisplacedVertexSeed.h"
#include "DataFormats/ParticleFlowReco/interface/PFDisplacedVertexSeedFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFDisplacedVertex.h"
#include "DataFormats/ParticleFlowReco/interface/PFDisplacedVertexFwd.h"

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"

#include "DataFormats/TrackReco/interface/TrackFwd.h"

#include "RecoParticleFlow/PFTracking/interface/PFCheckHitPattern.h"

/// \brief Displaced Vertex Finder Algorithm
/*!
  \author Maxime Gouzevitch
  \date October 2009
*/

class TrackingGeometry;
class TrackerGeometry;
class MagneticField;

class PFDisplacedVertexFinder {
public:
  PFDisplacedVertexFinder();

  ~PFDisplacedVertexFinder();

  /// -------- Useful Types -------- ///

  typedef reco::PFDisplacedVertexSeedCollection::iterator IDVS;
  typedef reco::PFDisplacedVertexCollection::iterator IDV;

  typedef std::pair<unsigned int, unsigned int> PFTrackHitInfo;
  typedef std::pair<PFTrackHitInfo, PFTrackHitInfo> PFTrackHitFullInfo;

  /// Fitter Type
  enum FitterType { F_NOTDEFINED, F_DONOTREFIT, F_KALMAN, F_ADAPTIVE };

  /// -------- Set different algo parameters -------- ///

  /// Sets algo parameters for the vertex finder
  void setParameters(double transvSize,
                     double longSize,
                     double primaryVertexCut,
                     double tobCut,
                     double tecCut,
                     double minAdaptWeight,
                     bool switchOff2TrackVertex) {
    transvSize_ = transvSize;
    longSize_ = longSize;
    primaryVertexCut_ = primaryVertexCut;
    tobCut_ = tobCut;
    tecCut_ = tecCut;
    minAdaptWeight_ = minAdaptWeight;
    switchOff2TrackVertex_ = switchOff2TrackVertex;
  }

  /// Sets debug printout flag
  void setDebug(bool debug) { debug_ = debug; }

  /// Sets parameters for track extrapolation and hits study
  void setEdmParameters(const MagneticField* magField,
                        edm::ESHandle<GlobalTrackingGeometry> globTkGeomHandle,
                        const TrackerTopology* tkerTopo,
                        const TrackerGeometry* tkerGeom) {
    magField_ = magField;
    globTkGeomHandle_ = globTkGeomHandle;
    tkerTopo_ = tkerTopo;
    tkerGeom_ = tkerGeom;
  }

  void setTracksSelector(const edm::ParameterSet& ps) { helper_.setTracksSelector(ps); }

  void setVertexIdentifier(const edm::ParameterSet& ps) { helper_.setVertexIdentifier(ps); }

  void setPrimaryVertex(edm::Handle<reco::VertexCollection> mainVertexHandle,
                        edm::Handle<reco::BeamSpot> beamSpotHandle) {
    helper_.setPrimaryVertex(mainVertexHandle, beamSpotHandle);
  }

  void setAVFParameters(const edm::ParameterSet& ps) {
    sigmacut_ = ps.getParameter<double>("sigmacut");
    t_ini_ = ps.getParameter<double>("Tini");
    ratio_ = ps.getParameter<double>("ratio");
  }

  /// Set input collections of tracks
  void setInput(const edm::Handle<reco::PFDisplacedVertexCandidateCollection>&);

  /// \return unique_ptr to collection of DisplacedVertices
  std::unique_ptr<reco::PFDisplacedVertexCollection> transferDisplacedVertices() {
    return std::move(displacedVertices_);
  }

  const std::unique_ptr<reco::PFDisplacedVertexCollection>& displacedVertices() const {
    return std::move(displacedVertices_);
  }

  /// -------- Main function which find vertices -------- ///

  void findDisplacedVertices();

private:
  /// -------- Different steps of the finder algorithm -------- ///

  /// Analyse a vertex candidate and select potential vertex point(s)
  void findSeedsFromCandidate(const reco::PFDisplacedVertexCandidate&, reco::PFDisplacedVertexSeedCollection&);

  /// Sometimes two vertex candidates can be quite close and coming from the same vertex
  void mergeSeeds(reco::PFDisplacedVertexSeedCollection&, std::vector<bool>& bLocked);

  /// Fit one by one the vertex points with associated tracks to get displaced vertices
  bool fitVertexFromSeed(const reco::PFDisplacedVertexSeed&, reco::PFDisplacedVertex&);

  /// Remove potentially fakes displaced vertices
  void selectAndLabelVertices(reco::PFDisplacedVertexCollection&, std::vector<bool>&);

  bool rejectAndLabelVertex(reco::PFDisplacedVertex& dv);

  /// -------- Tools -------- ///

  bool isCloseTo(const reco::PFDisplacedVertexSeed&, const reco::PFDisplacedVertexSeed&) const;

  std::pair<float, float> getTransvLongDiff(const GlobalPoint&, const GlobalPoint&) const;

  reco::PFDisplacedVertex::VertexTrackType getVertexTrackType(PFTrackHitFullInfo&) const;

  unsigned commonTracks(const reco::PFDisplacedVertex&, const reco::PFDisplacedVertex&) const;

  friend std::ostream& operator<<(std::ostream&, const PFDisplacedVertexFinder&);

  /// -------- Members -------- ///

  reco::PFDisplacedVertexCandidateCollection const* displacedVertexCandidates_;
  std::unique_ptr<reco::PFDisplacedVertexCollection> displacedVertices_;

  /// -------- Parameters -------- ///

  /// Algo parameters for the vertex finder

  float transvSize_;
  float longSize_;
  double primaryVertexCut_;
  double tobCut_;
  double tecCut_;
  double minAdaptWeight_;

  bool switchOff2TrackVertex_;

  /// Adaptive Vertex Fitter parameters

  double sigmacut_;  //= 6;
  double t_ini_;     //= 256.;
  double ratio_;     //= 0.25;

  /// If true, debug printouts activated
  bool debug_;

  /// Tracker geometry for discerning hit positions
  edm::ESHandle<GlobalTrackingGeometry> globTkGeomHandle_;

  /// doc?
  const TrackerTopology* tkerTopo_;
  const TrackerGeometry* tkerGeom_;

  /// to be able to extrapolate tracks f
  const MagneticField* magField_;

  PFCheckHitPattern hitPattern_;

  PFDisplacedVertexHelper helper_;
};

#endif