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 *****************************************************************************/
30 #include "AliVertex.h"
32 class AliESDVertex : public AliVertex {
37 AliESDVertex(Double_t positionZ,Double_t sigmaZ,Int_t nContributors,
38 const Char_t *vtxName="Vertex");
39 AliESDVertex(Double_t position[3],Double_t covmatrix[6],
40 Double_t chi2,Int_t nContributors,
41 const Char_t *vtxName="Vertex");
42 AliESDVertex(Double_t position[3],Double_t sigma[3],
43 const Char_t *vtxName="Vertex");
44 AliESDVertex(Double_t position[3],Double_t sigma[3],Double_t snr[3],
45 const Char_t *vtxName="Vertex");
47 virtual ~AliESDVertex(){;}
50 void GetSigmaXYZ(Double_t sigma[3]) const;
51 void GetCovMatrix(Double_t covmatrix[6]) const;
52 void GetSNR(Double_t snr[3]) const;
54 Double_t GetXRes() const {return TMath::Sqrt(fCovXX);}
55 Double_t GetYRes() const {return TMath::Sqrt(fCovYY);}
56 Double_t GetZRes() const {return TMath::Sqrt(fCovZZ);}
57 Double_t GetXSNR() const { return fSNR[0]; }
58 Double_t GetYSNR() const { return fSNR[1]; }
59 Double_t GetZSNR() const { return fSNR[2]; }
61 Double_t GetChi2() const { return fChi2; }
62 Double_t GetChi2toNDF() const
63 { return fChi2/(2.*(Double_t)fNContributors-3.); }
65 void Print(Option_t* option = "") const;
66 void PrintStatus() const {Print();}
67 void SetTruePos(Double_t *tp){for(Int_t i=0;i<3;i++)fTruePos[i]=tp[i];}
68 void GetTruePos(Double_t *tp) const
69 {for(Int_t i=0;i<3;i++)tp[i]=fTruePos[i];}
71 void Reset() { SetToZero(); SetName("Vertex"); }
75 Double_t fCovXX,fCovXY,fCovYY,fCovXZ,fCovYZ,fCovZZ; // vertex covariance matrix
76 Double_t fSNR[3]; // S/N ratio
77 Double_t fChi2; // chi2 of vertex fit
78 Double_t fTruePos[3]; //true vertex position (for comparison purposes)
84 ClassDef(AliESDVertex,5) // Class for Primary Vertex