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File indexing completed on 2021-02-14 12:54:16

0001 #ifndef DataFormat_ParticleFlowReco_PFDisplacedVertex_h
0002 #define DataFormat_ParticleFlowReco_PFDisplacedVertex_h
0003 
0004 #include "DataFormats/TrackReco/interface/TrackFwd.h"
0005 #include "DataFormats/VertexReco/interface/Vertex.h"
0006 #include "DataFormats/Math/interface/LorentzVector.h"
0007 
0008 #include <vector>
0009 #include <string>
0010 #include <iostream>
0011 
0012 namespace reco {
0013 
0014   /// \brief Block of elements
0015   /*!
0016     \author Maxime Gouzevitch
0017     \date November 2009
0018 
0019     A DisplacedVertex is an extension of Vector with some additionnal informations
0020     tracks's hit-vertex distances, tracks types and the expected vertex type.
0021   */
0022 
0023   class PFDisplacedVertex : public Vertex {
0024   public:
0025     /// Information on the distance between track's hits and the Vertex
0026     typedef std::pair<unsigned int, unsigned int> PFTrackHitInfo;
0027     typedef std::pair<PFTrackHitInfo, PFTrackHitInfo> PFTrackHitFullInfo;
0028 
0029     /// Mass hypothesis enum
0030     enum M_Hypo { M_CUSTOM, M_MASSLESS, M_PION, M_KAON, M_LAMBDA };
0031 
0032     /// Classification of tracks according to the position with respect
0033     /// to the Vertex. A Merged track is a track which has at least
0034     /// two hits before and two hits after the vertex. It may come from
0035     /// a primary track merged with a low quality secondary track.
0036     enum VertexTrackType { T_NOT_FROM_VERTEX, T_TO_VERTEX, T_FROM_VERTEX, T_MERGED };
0037 
0038     /// Classification of vertex according to different parameters such as the
0039     /// Number of tracks, the invariant mass etc...
0040     enum VertexType {
0041       ANY = 0,
0042       FAKE = 1,
0043       LOOPER = 2,
0044       NUCL = 10,
0045       NUCL_LOOSE = 11,
0046       NUCL_KINK = 12,
0047       CONVERSION = 20,
0048       CONVERSION_LOOSE = 21,
0049       CONVERTED_BREMM = 22,
0050       K0_DECAY = 30,
0051       LAMBDA_DECAY = 31,
0052       LAMBDABAR_DECAY = 32,
0053       KPLUS_DECAY = 40,
0054       KMINUS_DECAY = 41,
0055       KPLUS_DECAY_LOOSE = 42,
0056       KMINUS_DECAY_LOOSE = 43,
0057       BSM_VERTEX = 100
0058     };
0059 
0060     /// Default constructor
0061     PFDisplacedVertex();
0062 
0063     /// Constructor from the reco::Vertex
0064     PFDisplacedVertex(reco::Vertex&);
0065 
0066     /// Add a new track to the vertex
0067     void addElement(const TrackBaseRef& r,
0068                     const Track& refTrack,
0069                     const PFTrackHitFullInfo& hitInfo,
0070                     VertexTrackType trackType = T_NOT_FROM_VERTEX,
0071                     float w = 1.0);
0072 
0073     /// Clean the tracks collection and all the associated collections
0074     void cleanTracks();
0075 
0076     /// Set the type of this vertex
0077     void setVertexType(VertexType vertexType) { vertexType_ = vertexType; }
0078 
0079     /// Estimate the direction of the vertex. This function produced a unitary vector.
0080     /// It is calculated the axis linking the primary vertex of the event pvtx to this vertex
0081     void setPrimaryDirection(const math::XYZPoint& pvtx);
0082 
0083     /// Get the type of this vertex
0084     VertexType vertexType() { return vertexType_; }
0085 
0086     const std::vector<PFTrackHitFullInfo> trackHitFullInfos() const { return trackHitFullInfos_; }
0087 
0088     const std::vector<VertexTrackType> trackTypes() const { return trackTypes_; }
0089 
0090     /// -------- Provide useful information -------- ///
0091 
0092     /// If a primary track was identified
0093     const bool isTherePrimaryTracks() const { return isThereKindTracks(T_TO_VERTEX); }
0094 
0095     /// If a merged track was identified
0096     const bool isThereMergedTracks() const { return isThereKindTracks(T_MERGED); }
0097 
0098     /// If a secondary track was identified
0099     const bool isThereSecondaryTracks() const { return isThereKindTracks(T_FROM_VERTEX); }
0100 
0101     /// If there is a track which was not identified
0102     const bool isThereNotFromVertexTracks() const { return isThereKindTracks(T_NOT_FROM_VERTEX); }
0103 
0104     /// Is a primary track was identified
0105     const bool isPrimaryTrack(const reco::TrackBaseRef& originalTrack) const {
0106       size_t itrk = trackPosition(originalTrack);
0107       return isTrack(itrk, T_TO_VERTEX);
0108     }
0109 
0110     /// Is a secondary track was identified
0111     const bool isSecondaryTrack(const reco::TrackBaseRef& originalTrack) const {
0112       size_t itrk = trackPosition(originalTrack);
0113       return isTrack(itrk, T_FROM_VERTEX);
0114     }
0115 
0116     /// Is a secondary track was identified
0117     const bool isMergedTrack(const reco::TrackBaseRef& originalTrack) const {
0118       size_t itrk = trackPosition(originalTrack);
0119       return isTrack(itrk, T_MERGED);
0120     }
0121 
0122     const PFTrackHitFullInfo trackHitFullInfo(const reco::TrackBaseRef& originalTrack) const {
0123       size_t itrk = trackPosition(originalTrack);
0124       return trackHitFullInfos_[itrk];
0125     }
0126 
0127     /// Is primary or merged track
0128     const bool isIncomingTrack(const reco::TrackBaseRef& originalTrack) const {
0129       size_t itrk = trackPosition(originalTrack);
0130       return isTrack(itrk, T_MERGED) || isTrack(itrk, T_TO_VERTEX);
0131     }
0132 
0133     /// Is secondary track
0134     const bool isOutgoingTrack(const reco::TrackBaseRef& originalTrack) const {
0135       size_t itrk = trackPosition(originalTrack);
0136       return isTrack(itrk, T_FROM_VERTEX);
0137     }
0138 
0139     /// Number of primary tracks was identified
0140     const int nPrimaryTracks() const { return nKindTracks(T_TO_VERTEX); }
0141 
0142     /// Number of merged tracks was identified
0143     const int nMergedTracks() const { return nKindTracks(T_MERGED); }
0144 
0145     /// Number of secondary tracks was identified
0146     const int nSecondaryTracks() const { return nKindTracks(T_FROM_VERTEX); }
0147 
0148     /// Number of tracks which was not identified
0149     const int nNotFromVertexTracks() const { return nKindTracks(T_NOT_FROM_VERTEX); }
0150 
0151     /// Number of tracks
0152     const int nTracks() const { return trackTypes_.size(); }
0153 
0154     //    const reco::VertexTrackType vertexTrackType(reco::TrackBaseRef tkRef) const;
0155 
0156     /// Momentum of secondary tracks calculated with a mass hypothesis. Some of those
0157     /// hypothesis are default: "PI" , "KAON", "LAMBDA", "MASSLESS", "CUSTOM"
0158     /// the value of custom shall be then provided in mass variable
0159     const math::XYZTLorentzVector secondaryMomentum(std::string massHypo = "PI",
0160                                                     bool useRefitted = true,
0161                                                     double mass = 0.0) const {
0162       return momentum(massHypo, T_FROM_VERTEX, useRefitted, mass);
0163     }
0164 
0165     /// Momentum of primary or merged track calculated with a mass hypothesis.
0166     const math::XYZTLorentzVector primaryMomentum(std::string massHypo = "PI",
0167                                                   bool useRefitted = true,
0168                                                   double mass = 0.0) const {
0169       return momentum(massHypo, T_TO_VERTEX, useRefitted, mass);
0170     }
0171 
0172     /// Momentum of secondary tracks calculated with a mass hypothesis. Some of those
0173     /// hypothesis are default: "PI" , "KAON", "LAMBDA", "MASSLESS", "CUSTOM"
0174     /// the value of custom shall be then provided in mass variable
0175     const math::XYZTLorentzVector secondaryMomentum(M_Hypo massHypo, bool useRefitted = true, double mass = 0.0) const {
0176       return momentum(massHypo, T_FROM_VERTEX, useRefitted, mass);
0177     }
0178 
0179     /// Momentum of primary or merged track calculated with a mass hypothesis.
0180     const math::XYZTLorentzVector primaryMomentum(M_Hypo massHypo, bool useRefitted = true, double mass = 0.0) const {
0181       return momentum(massHypo, T_TO_VERTEX, useRefitted, mass);
0182     }
0183 
0184     void calcKinematics() {
0185       defaultPrimaryMomentum_ = momentum("PI", T_TO_VERTEX, false, 0.0);
0186       defaultSecondaryMomentum_ = momentum("PI", T_FROM_VERTEX, true, 0.0);
0187     }
0188 
0189     const double secondaryPt() const { return defaultPrimaryMomentum_.Pt(); }
0190 
0191     /// Momentum of primary or merged track calculated with a mass hypothesis.
0192     const double primaryPt() const { return defaultSecondaryMomentum_.Pt(); }
0193 
0194     /// Total Charge
0195     const int totalCharge() const;
0196 
0197     /// Angle PrimaryVertex-DisplacedVertex (or primary track if there is)
0198     /// And secondary momentum
0199     const double angle_io() const;
0200 
0201     /// Primary Direction
0202     const math::XYZVector primaryDirection() const;
0203 
0204     bool isFake() const { return vertexType_ == FAKE; }
0205     bool isLooper() const { return vertexType_ == LOOPER; }
0206     bool isNucl() const { return vertexType_ == NUCL; }
0207     bool isNucl_Loose() const { return vertexType_ == NUCL_LOOSE; }
0208     bool isNucl_Kink() const { return vertexType_ == NUCL_KINK; }
0209     bool isConv() const { return vertexType_ == CONVERSION; }
0210     bool isConv_Loose() const { return vertexType_ == CONVERSION_LOOSE; }
0211     bool isConvertedBremm() const { return vertexType_ == CONVERTED_BREMM; }
0212     bool isK0() const { return vertexType_ == K0_DECAY; }
0213     bool isLambda() const { return vertexType_ == LAMBDA_DECAY; }
0214     bool isLambdaBar() const { return vertexType_ == LAMBDABAR_DECAY; }
0215     bool isKplus() const { return vertexType_ == KPLUS_DECAY; }
0216     bool isKminus() const { return vertexType_ == KMINUS_DECAY; }
0217     bool isKplus_Loose() const { return vertexType_ == KPLUS_DECAY_LOOSE; }
0218     bool isKminus_Loose() const { return vertexType_ == KMINUS_DECAY_LOOSE; }
0219     bool isBSM() const { return vertexType_ == BSM_VERTEX; }
0220 
0221     std::string nameVertexType() const;
0222 
0223     /// cout function
0224     void Dump(std::ostream& out = std::cout) const;
0225 
0226   private:
0227     /// --------- TOOLS -------------- ///
0228 
0229     /// Common tool used to know if there are tracks of a given Kind
0230     const bool isThereKindTracks(VertexTrackType) const;
0231 
0232     /// Common tool used to get the number of tracks of a given Kind
0233     const int nKindTracks(VertexTrackType) const;
0234 
0235     /// Common tool to calculate the momentum vector of tracks with a given Kind
0236     const math::XYZTLorentzVector momentum(std::string, VertexTrackType, bool, double mass) const;
0237 
0238     /// Common tool to calculate the momentum vector of tracks with a given Kind
0239     const math::XYZTLorentzVector momentum(M_Hypo massHypo, VertexTrackType, bool, double mass) const;
0240 
0241     /// Get the mass with a given hypothesis
0242     const double getMass2(M_Hypo, double) const;
0243 
0244     const size_t trackPosition(const reco::TrackBaseRef& originalTrack) const;
0245 
0246     const bool isTrack(size_t itrk, VertexTrackType T) const { return trackTypes_[itrk] == T; }
0247 
0248     /// -------- MEMBERS -------- ///
0249 
0250     /// This vertex type
0251     VertexType vertexType_;
0252 
0253     /// Types of the tracks associated to the vertex
0254     std::vector<VertexTrackType> trackTypes_;
0255 
0256     /// Information on the distance between track's hits and the Vertex
0257     std::vector<PFTrackHitFullInfo> trackHitFullInfos_;
0258 
0259     math::XYZVector primaryDirection_;
0260 
0261     math::XYZTLorentzVector defaultPrimaryMomentum_;
0262     math::XYZTLorentzVector defaultSecondaryMomentum_;
0263   };
0264 }  // namespace reco
0265 
0266 #endif