3 /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 //-------------------------------------------------------
9 // Primary Vertex Class
10 // for the Event Data Summary Class
11 // Origin: A.Dainese, Padova, andrea.dainese@pd.infn.it
12 //-------------------------------------------------------
14 /*****************************************************************************
16 * This class deals with primary vertex. *
17 * AliESDVertex objects are created by the class AliITSVertexer and its *
19 * Different constructors are provided: *
20 * - for primary vertex determined with pixels in pp (only Z) *
21 * - for primary vertex determined with pixels in ion-ion (X,Y,Z) *
22 * - for primary vertex determined with ITS tracks in pp (X,Y,Z) *
23 * This class replaces the previous version of AliESDVertex, designed *
24 * originally only for A-A collisions. The functionalities of the old class *
25 * are maintained in the AliITSVertexerIons class *
27 *****************************************************************************/
31 #include "AliVertex.h"
34 class AliESDVertex : public AliVertex {
39 AliESDVertex(Double_t positionZ,Double_t sigmaZ,Int_t nContributors,
40 const Char_t *vtxName="Vertex");
41 AliESDVertex(Double_t position[3],Double_t covmatrix[6],
42 Double_t chi2,Int_t nContributors,
43 const Char_t *vtxName="Vertex");
44 AliESDVertex(Double_t position[3],Double_t sigma[3],
45 const Char_t *vtxName="Vertex");
46 AliESDVertex(Double_t position[3],Double_t sigma[3],Double_t snr[3],
47 const Char_t *vtxName="Vertex");
48 AliESDVertex(const AliESDVertex &source);
49 AliESDVertex &operator=(const AliESDVertex &source);
50 virtual void Copy(TObject &obj) const;
52 virtual ~AliESDVertex() {}
54 void GetSigmaXYZ(Double_t sigma[3]) const;
55 void GetCovMatrix(Double_t covmatrix[6]) const;
56 void GetCovarianceMatrix(Double_t covmatrix[6]) const
57 {GetCovMatrix(covmatrix);}
58 void GetSNR(Double_t snr[3]) const;
59 void SetCovarianceMatrix(const Double_t *cov);
61 Double_t GetXRes() const {return TMath::Sqrt(fCovXX);}
62 Double_t GetYRes() const {return TMath::Sqrt(fCovYY);}
63 Double_t GetZRes() const {return TMath::Sqrt(fCovZZ);}
64 Double_t GetXSNR() const { return fSNR[0]; }
65 Double_t GetYSNR() const { return fSNR[1]; }
66 Double_t GetZSNR() const { return fSNR[2]; }
67 void SetSNR(double snr, int i) {if (i<3 && i>=0) fSNR[i] = snr;}
69 Double_t GetChi2() const { return fChi2; }
70 void SetChi2(Double_t chi) { fChi2 = chi; }
71 Double_t GetChi2toNDF() const
72 { return fChi2/(2.*(Double_t)fNContributors-3.); }
73 Double_t GetChi2perNDF() const { return GetChi2toNDF();}
74 Int_t GetNDF() const {return (2*fNContributors-3);}
76 void Print(Option_t* option = "") const;
77 void PrintStatus() const {Print();}
79 void Reset() { SetToZero(); SetName("Vertex"); }
81 void SetID(Char_t id) {fID=id;}
82 Char_t GetID() const {return fID;}
84 void SetBC(Int_t bc) {fBCID = bc;}
85 Int_t GetBC() const {return fBCID;}
86 Double_t GetWDist(const AliESDVertex* v) const;
90 Double32_t fCovXX,fCovXY,fCovYY,fCovXZ,fCovYZ,fCovZZ; // vertex covariance matrix
91 Double32_t fSNR[3]; // S/N ratio
92 Double32_t fChi2; // chi2 of vertex fit
94 Char_t fID; // ID of this vertex within an ESD event
95 Char_t fBCID; // BC ID assigned to vertex
100 ClassDef(AliESDVertex,8) // Class for Primary Vertex