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1 | #ifndef ALIITSVERTEXERTRACKS_H | |
2 | #define ALIITSVERTEXERTRACKS_H | |
3 | /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. * | |
4 | * See cxx source for full Copyright notice */ | |
5 | ||
6 | ||
7 | //------------------------------------------------------- | |
8 | // Class for primary vertex determination with ITS tracks | |
9 | // | |
10 | // Origin: A.Dainese, Padova, andrea.dainese@pd.infn.it | |
11 | // M.Masera, Torino, massimo.masera@to.infn.it | |
12 | //------------------------------------------------------- | |
13 | ||
14 | /***************************************************************************** | |
15 | * * | |
16 | * This class determines the primary vertex position using ITS tracks. * | |
17 | * This is done in two steps: * | |
18 | * 1) Vertex Finding: a reasonable estimate of the vertex position is * | |
19 | * obtained from a mean of "points of closest approach" between all * | |
20 | * possible pairs of tracks. * | |
21 | * 2) Vertex Fitting: once tracks are propagated to the position given by * | |
22 | * first step, the optimal estimate of the position of vertex is obtained * | |
23 | * from a weighted average of the track positions. A covariance * | |
24 | * matrix and a chi2 for the vertex are given. * | |
25 | * * | |
26 | *****************************************************************************/ | |
27 | ||
28 | #include "AliKalmanTrack.h" | |
29 | #include "AliITSVertexer.h" | |
30 | ||
31 | #include <TObjArray.h> | |
32 | ||
33 | class TTree; | |
34 | class AliESDVertex; | |
35 | class AliESD; | |
36 | ||
37 | class AliITSVertexerTracks : public AliITSVertexer { | |
38 | ||
39 | public: | |
40 | // default constructor | |
41 | AliITSVertexerTracks(); | |
42 | // standard constructor | |
43 | AliITSVertexerTracks(TFile *inFile,TFile *outFile, | |
44 | const AliMagF *map,Int_t fEv=0,Int_t lEv=0, | |
45 | Double_t xStart=0.,Double_t yStart=0.); | |
46 | // alternative constructor | |
47 | AliITSVertexerTracks(const AliMagF *map, TString fn, | |
48 | Double_t xStart=0,Double_t yStart=0); | |
49 | // destructor | |
50 | virtual ~AliITSVertexerTracks(); | |
51 | // return vertex from the set of tracks in the tree | |
52 | AliESDVertex* VertexOnTheFly(TTree &trkTree); | |
53 | // computes the vertex for the current event | |
54 | virtual AliESDVertex* FindVertexForCurrentEvent(Int_t evnumb); | |
55 | // computes the vertex for the current event using the ESD | |
56 | AliESDVertex* FindVertexForCurrentEvent(AliESD *esdEvent); | |
57 | // computes the vertex for each event and stores it on file | |
58 | virtual void FindVertices(); | |
59 | // computes the vertex for each event and stores it in the ESD | |
60 | void FindVerticesESD(); | |
61 | virtual void PrintStatus() const; | |
62 | void SetFieldMap(const AliMagF *map)const{AliKalmanTrack::SetFieldMap(map);} | |
63 | void SetMinTracks(Int_t n=2) { fMinTracks = n; return; } | |
64 | void SetSkipTracks(Int_t n,Int_t *skipped); | |
65 | void SetVtxStart(Double_t x=0,Double_t y=0) | |
66 | { fNominalPos[0]=x; fNominalPos[1]=y; return; } | |
67 | ||
68 | private: | |
69 | // copy constructor (NO copy allowed: the constructor is protected | |
70 | // to avoid misuse) | |
71 | AliITSVertexerTracks(const AliITSVertexerTracks& vtxr); | |
72 | // assignment operator (NO assignment allowed) | |
73 | AliITSVertexerTracks& operator=(const AliITSVertexerTracks& /* vtxr */); | |
74 | TFile *fInFile; // input file (with tracks) | |
75 | TFile *fOutFile; // output file for vertices | |
76 | Double_t fInitPos[3]; // vertex position after vertex finder | |
77 | Double_t fNominalPos[2]; // initial knowledge on vertex position | |
78 | Int_t fMinTracks; // minimum number of tracks | |
79 | Double_t fMaxChi2PerTrack; // maximum contribition to the chi2 | |
80 | TObjArray fTrkArray; // array with tracks to be processed | |
81 | Int_t *fTrksToSkip; // tracks to be skipped for find and fit | |
82 | Int_t fNTrksToSkip; // number of tracks to be skipped | |
83 | ||
84 | Bool_t CheckField() const; | |
85 | void ComputeMaxChi2PerTrack(Int_t nTracks); | |
86 | Int_t PrepareTracks(TTree &trkTree); | |
87 | void TooFewTracks(); | |
88 | void VertexFinder(); | |
89 | void VertexFitter(); | |
90 | ||
91 | ClassDef(AliITSVertexerTracks,1) // 3D Vertexing with ITS tracks | |
92 | }; | |
93 | ||
94 | #endif | |
95 | ||
96 | ||
97 |