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2d57349e | 1 | #ifndef ALIVERTEXERTRACKS_H |
2 | #define ALIVERTEXERTRACKS_H | |
3 | /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. * | |
4 | * See cxx source for full Copyright notice */ | |
5 | ||
6 | ||
7 | //------------------------------------------------------- | |
6d8df534 | 8 | // Class for vertex determination with tracks |
2d57349e | 9 | // |
10 | // Origin: AliITSVertexerTracks | |
11 | // A.Dainese, Padova, andrea.dainese@pd.infn.it | |
12 | // M.Masera, Torino, massimo.masera@to.infn.it | |
13 | // Moved to STEER and adapted to ESD tracks: | |
14 | // F.Prino, Torino, prino@to.infn.it | |
15 | //------------------------------------------------------- | |
16 | ||
17 | /***************************************************************************** | |
18 | * * | |
6d8df534 | 19 | * This class determines the vertex of a set of tracks. * |
2d57349e | 20 | * Different algorithms are implemented, see data member fAlgo. * |
21 | * * | |
22 | *****************************************************************************/ | |
23 | ||
2d57349e | 24 | #include <TObjArray.h> |
817e1004 | 25 | #include <TMatrixD.h> |
2d57349e | 26 | |
6d8df534 | 27 | #include "AliLog.h" |
f5740e9a | 28 | #include "AliESDVertex.h" |
6d8df534 | 29 | |
817e1004 | 30 | |
f5740e9a | 31 | class AliExternalTrackParam; |
0aa2faf4 | 32 | class AliVEvent; |
8e104736 | 33 | class AliStrLine; |
2d57349e | 34 | |
35 | class AliVertexerTracks : public TObject { | |
36 | ||
37 | public: | |
38 | AliVertexerTracks(); | |
dc3719f3 | 39 | AliVertexerTracks(Double_t fieldkG); |
2d57349e | 40 | virtual ~AliVertexerTracks(); |
41 | ||
f5740e9a | 42 | AliESDVertex* FindPrimaryVertex(const AliVEvent *vEvent); |
43 | AliESDVertex* FindPrimaryVertex(const TObjArray *trkArrayOrig,UShort_t *idOrig); | |
44 | AliESDVertex* VertexForSelectedTracks(const TObjArray *trkArray,UShort_t *id, | |
6d8df534 | 45 | Bool_t optUseFitter=kTRUE, |
97669588 | 46 | Bool_t optPropagate=kTRUE, |
47 | Bool_t optUseDiamondConstraint=kFALSE); | |
6d8df534 | 48 | AliESDVertex* VertexForSelectedESDTracks(TObjArray *trkArray, |
49 | Bool_t optUseFitter=kTRUE, | |
97669588 | 50 | Bool_t optPropagate=kTRUE, |
51 | Bool_t optUseDiamondConstraint=kFALSE); | |
6d8df534 | 52 | AliESDVertex* RemoveTracksFromVertex(AliESDVertex *inVtx, |
f5740e9a | 53 | const TObjArray *trkArray,UShort_t *id, |
54 | const Float_t *diamondxy) const; | |
6b908072 | 55 | AliESDVertex* RemoveConstraintFromVertex(AliESDVertex *inVtx, |
56 | Float_t *diamondxyz, | |
57 | Float_t *diamondcov) const; | |
a00021a7 | 58 | void SetITSMode(Double_t dcacut=0.1, |
59 | Double_t dcacutIter0=0.1, | |
60 | Double_t maxd0z0=0.5, | |
61 | Int_t minCls=5, | |
62 | Int_t mintrks=1, | |
63 | Double_t nsigma=3., | |
64 | Double_t mindetfitter=100., | |
65 | Double_t maxtgl=1000., | |
66 | Double_t fidR=3., | |
8c75f668 | 67 | Double_t fidZ=30., |
68 | Int_t finderAlgo=1, | |
69 | Int_t finderAlgoIter0=4); | |
a00021a7 | 70 | void SetTPCMode(Double_t dcacut=0.1, |
71 | Double_t dcacutIter0=1.0, | |
72 | Double_t maxd0z0=5.0, | |
73 | Int_t minCls=10, | |
74 | Int_t mintrks=1, | |
75 | Double_t nsigma=3., | |
76 | Double_t mindetfitter=0.1, | |
77 | Double_t maxtgl=1.5, | |
78 | Double_t fidR=3., | |
8c75f668 | 79 | Double_t fidZ=30., |
80 | Int_t finderAlgo=1, | |
81 | Int_t finderAlgoIter0=4); | |
a00021a7 | 82 | void SetCuts(Double_t *cuts); |
302c78d4 | 83 | void SetConstraintOff() { fConstraint=kFALSE; SetVtxStart(); SetVtxStartSigma(); return; } |
fee9ef0d | 84 | void SetConstraintOn() { fConstraint=kTRUE; return; } |
fee9ef0d | 85 | void SetDCAcut(Double_t maxdca) { fDCAcut=maxdca; return; } |
f09c879d | 86 | void SetDCAcutIter0(Double_t maxdca) { fDCAcutIter0=maxdca; return; } |
fee9ef0d | 87 | void SetFinderAlgorithm(Int_t opt=1) { fAlgo=opt; return; } |
6d8df534 | 88 | void SetITSrefitRequired() { fITSrefit=kTRUE; return; } |
40cfa14d | 89 | void SetITSpureSA() { fITSpureSA=kTRUE; return; } |
0aa2faf4 | 90 | Bool_t GetITSrefitRequired() const { return fITSrefit; } |
50ff0bcd | 91 | void SetITSrefitNotRequired() { fITSrefit=kFALSE; return; } |
6b29d399 | 92 | void SetFiducialRZ(Double_t r=3,Double_t z=30) { fFiducialR=r; fFiducialZ=z; return; } |
fee9ef0d | 93 | void SetMaxd0z0(Double_t maxd0z0=0.5) { fMaxd0z0=maxd0z0; return; } |
6b29d399 | 94 | void SetMinClusters(Int_t n=5) { fMinClusters=n; return; } |
0aa2faf4 | 95 | Int_t GetMinClusters() const { return fMinClusters; } |
6d8df534 | 96 | void SetMinTracks(Int_t n=1) { fMinTracks=n; return; } |
fee9ef0d | 97 | void SetNSigmad0(Double_t n=3) { fNSigma=n; return; } |
98 | Double_t GetNSigmad0() const { return fNSigma; } | |
f09c879d | 99 | void SetMinDetFitter(Double_t mindet=100.) { fMinDetFitter=mindet; return; } |
100 | void SetMaxTgl(Double_t maxtgl=1.) { fMaxTgl=maxtgl; return; } | |
fee9ef0d | 101 | void SetOnlyFitter() { if(!fConstraint) AliFatal("Set constraint first!"); |
102 | fOnlyFitter=kTRUE; return; } | |
f5740e9a | 103 | void SetSkipTracks(Int_t n,const Int_t *skipped); |
3b768a1d | 104 | void SetVtxStart(Double_t x=0,Double_t y=0,Double_t z=0) |
07680cae | 105 | { fNominalPos[0]=x; fNominalPos[1]=y; fNominalPos[2]=z; return; } |
146c29df | 106 | void SetVtxStartSigma(Double_t sx=3.,Double_t sy=3.,Double_t sz=15.) |
50ff0bcd | 107 | { fNominalCov[0]=sx*sx; fNominalCov[2]=sy*sy; fNominalCov[5]=sz*sz; |
108 | fNominalCov[1]=0.; fNominalCov[3]=0.; fNominalCov[4]=0.; return; } | |
109 | void SetVtxStart(AliESDVertex *vtx); | |
f5740e9a | 110 | static Double_t GetStrLinMinDist(const Double_t *p0,const Double_t *p1,const Double_t *x0); |
71d84967 | 111 | static Double_t GetDeterminant3X3(Double_t matr[][3]); |
817e1004 | 112 | static void GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,Double_t (*m)[3],Double_t *d); |
f5740e9a | 113 | static void GetStrLinDerivMatrix(const Double_t *p0,const Double_t *p1,const Double_t *sigmasq,Double_t (*m)[3],Double_t *d); |
114 | static AliESDVertex TrackletVertexFinder(const TClonesArray *lines, Int_t optUseWeights=0); | |
8e104736 | 115 | static AliESDVertex TrackletVertexFinder(AliStrLine **lines, const Int_t knacc, Int_t optUseWeights=0); |
dc3719f3 | 116 | void SetFieldkG(Double_t field=-999.) { fFieldkG=field; return; } |
117 | Double_t GetFieldkG() const { | |
118 | if(fFieldkG<-99.) AliFatal("Field value not set"); | |
119 | return fFieldkG; } | |
3b768a1d | 120 | void SetNSigmaForUi00(Double_t n=1.5) { fnSigmaForUi00=n; return; } |
121 | Double_t GetNSigmaForUi00() const { return fnSigmaForUi00; } | |
07680cae | 122 | |
2d57349e | 123 | protected: |
fee9ef0d | 124 | void HelixVertexFinder(); |
0c69be49 | 125 | void OneTrackVertFinder(); |
f5740e9a | 126 | Int_t PrepareTracks(const TObjArray &trkArrayOrig,const UShort_t *idOrig, |
6d8df534 | 127 | Int_t optImpParCut); |
f09c879d | 128 | Bool_t PropagateTrackTo(AliExternalTrackParam *track, |
129 | Double_t xToGo); | |
6d8df534 | 130 | Bool_t TrackToPoint(AliExternalTrackParam *t, |
817e1004 | 131 | TMatrixD &ri,TMatrixD &wWi, |
0bf2e2b4 | 132 | Bool_t uUi3by3=kFALSE) const; |
2d57349e | 133 | void VertexFinder(Int_t optUseWeights=0); |
6d8df534 | 134 | void VertexFitter(); |
fee9ef0d | 135 | void StrLinVertexFinderMinDist(Int_t optUseWeights=0); |
6d8df534 | 136 | void TooFewTracks(); |
eae1677e | 137 | |
146c29df | 138 | AliESDVertex fVert; // vertex after vertex finder |
ec1be5d5 | 139 | AliESDVertex *fCurrentVertex; // ESD vertex after fitter |
f09c879d | 140 | UShort_t fMode; // 0 ITS+TPC; 1 TPC |
dc3719f3 | 141 | Double_t fFieldkG; // z component of field (kGauss) |
07680cae | 142 | Double_t fNominalPos[3]; // initial knowledge on vertex position |
50ff0bcd | 143 | Double_t fNominalCov[6]; // initial knowledge on vertex position |
f09c879d | 144 | TObjArray fTrkArraySel; // array with tracks to be processed |
145 | UShort_t *fIdSel; // IDs of the tracks (AliESDtrack::GetID()) | |
146 | Int_t *fTrksToSkip; // track IDs to be skipped for find and fit | |
147 | Int_t fNTrksToSkip; // number of tracks to be skipped | |
fee9ef0d | 148 | Bool_t fConstraint; // true when "mean vertex" was set in |
149 | // fNominal ... and must be used in the fit | |
150 | Bool_t fOnlyFitter; // primary with one fitter shot only | |
151 | // (use only with beam constraint) | |
2d57349e | 152 | Int_t fMinTracks; // minimum number of tracks |
6b29d399 | 153 | Int_t fMinClusters; // minimum number of ITS or TPC clusters per track |
2d57349e | 154 | Double_t fDCAcut; // maximum DCA between 2 tracks used for vertex |
f09c879d | 155 | Double_t fDCAcutIter0; // maximum DCA between 2 tracks used for vertex |
07680cae | 156 | Double_t fNSigma; // number of sigmas for d0 cut in PrepareTracks() |
43c9dae1 | 157 | Double_t fMaxd0z0; // value for sqrt(d0d0+z0z0) cut |
fee9ef0d | 158 | // in PrepareTracks(1) if fConstraint=kFALSE |
f09c879d | 159 | Double_t fMinDetFitter; // minimum determinant to try to invertex matrix |
160 | Double_t fMaxTgl; // maximum tgl of tracks | |
50ff0bcd | 161 | Bool_t fITSrefit; // if kTRUE (default), use only kITSrefit tracks |
162 | // if kFALSE, use all tracks (also TPC only) | |
40cfa14d | 163 | Bool_t fITSpureSA; // if kFALSE (default) skip ITSpureSA tracks |
164 | // if kTRUE use only those | |
6b29d399 | 165 | Double_t fFiducialR; // radius of fiducial cylinder for tracks |
166 | Double_t fFiducialZ; // length of fiducial cylinder for tracks | |
3b768a1d | 167 | Double_t fnSigmaForUi00; // n. sigmas from finder in TrackToPoint |
f09c879d | 168 | Int_t fAlgo; // option for vertex finding algorythm |
8c75f668 | 169 | Int_t fAlgoIter0; // this is for iteration 0 |
2d57349e | 170 | // fAlgo=1 (default) finds minimum-distance point among all selected tracks |
171 | // approximated as straight lines | |
172 | // and uses errors on track parameters as weights | |
173 | // fAlgo=2 finds minimum-distance point among all the selected tracks | |
174 | // approximated as straight lines | |
175 | // fAlgo=3 finds the average point among DCA points of all pairs of tracks | |
176 | // treated as helices | |
177 | // fAlgo=4 finds the average point among DCA points of all pairs of tracks | |
178 | // approximated as straight lines | |
179 | // and uses errors on track parameters as weights | |
180 | // fAlgo=5 finds the average point among DCA points of all pairs of tracks | |
181 | // approximated as straight lines | |
182 | ||
3b768a1d | 183 | |
fe12e09c | 184 | private: |
185 | AliVertexerTracks(const AliVertexerTracks & source); | |
186 | AliVertexerTracks & operator=(const AliVertexerTracks & source); | |
2d57349e | 187 | |
40cfa14d | 188 | ClassDef(AliVertexerTracks,14) // 3D Vertexing with tracks |
2d57349e | 189 | }; |
190 | ||
191 | #endif | |
43c9dae1 | 192 |