4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
9 //-------------------------------------------------------------------------
10 // ESD V0 Vertex Class
11 // This class is part of the Event Summary Data set of classes
12 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
13 //-------------------------------------------------------------------------
18 class AliExternalTrackParam;
20 class AliESDv0 : public TObject {
23 AliESDv0(const AliExternalTrackParam &t1, Int_t i1,
24 const AliExternalTrackParam &t2, Int_t i2);
26 Double_t ChangeMassHypothesis(Int_t code=kK0Short);
28 Int_t GetPdgCode() const {return fPdgCode;}
29 Double_t GetEffMass() const {return fEffMass;}
30 Double_t GetChi2() const {return fChi2;}
31 void GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const;
32 void GetNPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const;
33 void GetPPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const;
34 void GetXYZ(Double_t &x, Double_t &y, Double_t &z) const;
35 Double_t GetD(Double_t x0=0.,Double_t y0=0.,Double_t z0=0.) const;
36 Int_t GetNindex() const {return fNidx;}
37 Int_t GetPindex() const {return fPidx;}
38 void SetESDindexes(Int_t ip, Int_t im){fNidx=ip;fPidx=im;}
39 void SetDcaDaughters(Double_t rDcaDaughters=0.);
40 Double_t GetDcaDaughters() {return fDcaDaughters;}
42 Int_t fPdgCode; // reconstructed V0's type (PDG code)
43 Double_t fEffMass; // reconstructed V0's effective mass
44 Double_t fDcaDaughters; // dca between V0's daughters
45 Double_t fChi2; // V0's chi2 value
46 Double_t fPos[3]; // V0's position (global)
47 Double_t fPosCov[6]; // covariance matrix of the vertex position
49 Int_t fNidx; // index of the negative daughter
50 Double_t fNmom[3]; // momentum of the negative daughter (global)
51 Double_t fNmomCov[6]; // covariance matrix of the negative daughter mom.
53 Int_t fPidx; // index of the positive daughter
54 Double_t fPmom[3]; // momentum of the positive daughter (global)
55 Double_t fPmomCov[6]; // covariance matrix of the positive daughter mom.
57 ClassDef(AliESDv0,1) // ESD V0 vertex
61 void AliESDv0::GetNPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const {
62 px=fNmom[0]; py=fNmom[1]; pz=fNmom[2];
66 void AliESDv0::GetPPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const {
67 px=fPmom[0]; py=fPmom[1]; pz=fPmom[2];
71 void AliESDv0::SetDcaDaughters(Double_t rDcaDaughters){
72 fDcaDaughters=rDcaDaughters;