1 #ifndef ALIESDCASCADE_H
2 #define ALIESDCASCADE_H
4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
9 //-------------------------------------------------------------------------
10 // ESD Cascade Vertex Class
11 // Implementation of the cascade vertex class
12 // Origin: Christian Kuhn, IReS, Strasbourg, christian.kuhn@ires.in2p3.fr
13 //-------------------------------------------------------------------------
19 class AliExternalTrackParam;
22 class AliESDcascade : public AliESDv0 {
24 enum { kOmegaPlusBar = -3334,
31 AliESDcascade(const AliESDcascade&);
32 AliESDcascade(const AliESDv0 &v0,
33 const AliExternalTrackParam &t, Int_t i);
35 AliESDcascade& operator=(const AliESDcascade&);
36 virtual void Copy(TObject &obj) const;
38 // Start with AliVParticle functions
39 virtual Double_t Px() const { return fNmom[0]+fPmom[0]+fBachMom[0]; }
40 virtual Double_t Py() const { return fNmom[1]+fPmom[1]+fBachMom[1]; }
41 virtual Double_t Pz() const { return fNmom[2]+fPmom[2]+fBachMom[2]; }
42 virtual Double_t Pt() const { return TMath::Sqrt(Px()*Px()+Py()*Py()); }
43 virtual Double_t P() const {
44 return TMath::Sqrt(Px()*Px()+Py()*Py()+Pz()*Pz());
46 virtual Bool_t PxPyPz(Double_t p[3]) const { p[0] = Px(); p[1] = Py(); p[2] = Pz(); return kTRUE; }
47 virtual Double_t Xv() const { return fPosXi[0]; }
48 virtual Double_t Yv() const { return fPosXi[1]; }
49 virtual Double_t Zv() const { return fPosXi[2]; }
50 virtual Bool_t XvYvZv(Double_t x[3]) const { x[0] = Xv(); x[1] = Yv(); x[2] = Zv(); return kTRUE; }
51 virtual Double_t OneOverPt() const { return (Pt() != 0.) ? 1./Pt() : -999.; }
52 virtual Double_t Phi() const {return TMath::Pi()+TMath::ATan2(-Py(),-Px()); }
53 virtual Double_t Theta() const {return 0.5*TMath::Pi()-TMath::ATan(Pz()/(Pt()+1.e-13)); }
54 virtual Double_t E() const; // default is Xis but can be changed via ChangeMassHypothesis (defined in the .cxx)
55 virtual Double_t M() const { return GetEffMassXi(); }
56 virtual Double_t Eta() const { return 0.5*TMath::Log((P()+Pz())/(P()-Pz()+1.e-13)); }
57 virtual Double_t Y() const { return 0.5*TMath::Log((E()+Pz())/(E()-Pz()+1.e-13)); }
58 virtual Short_t Charge() const { return 0; }
59 virtual Int_t GetLabel() const { return -1; } // temporary
60 virtual const Double_t *PID() const { return 0; } // return PID object ? (to be discussed!)
62 // Then the older functions
63 Double_t ChangeMassHypothesis(Double_t &v0q, Int_t code=kXiMinus);
65 Int_t GetPdgCodeXi() const {return fPdgCodeXi;}
66 Double_t GetEffMassXi() const {return fEffMassXi;}
67 Double_t GetChi2Xi() const {return fChi2Xi;}
68 void GetPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const;
69 void GetXYZcascade(Double_t &x, Double_t &y, Double_t &z) const;
70 Double_t GetDcascade(Double_t x0=0.,Double_t y0=0.,Double_t z0=0.) const;
72 void GetBPxPyPz(Double_t &px, Double_t &py, Double_t &pz) const {
73 px=fBachMom[0]; py=fBachMom[1]; pz=fBachMom[2];
76 Int_t GetBindex() const {return fBachIdx;}
77 void SetIndex(Int_t i) {fBachIdx=i;} //for the consistency with V0
78 Int_t GetIndex() const {return GetBindex();} //for the consistency with V0
79 void SetDcaXiDaughters(Double_t rDcaXiDaughters=0.);
80 Double_t GetDcaXiDaughters() const {return fDcaXiDaughters;}
81 Double_t GetCascadeCosineOfPointingAngle(Double_t&, Double_t&, Double_t&) const;
83 void GetPosCovXi(Double_t cov[6]) const;
87 Double32_t fEffMassXi; // reconstructed cascade effective mass
88 Double32_t fChi2Xi; // chi2 value
89 Double32_t fDcaXiDaughters; // dca between Xi's daughters
90 Double32_t fPosXi[3]; // cascade vertex position (global)
91 Double32_t fPosCovXi[6]; // covariance matrix of the vertex position
92 Double32_t fBachMom[3]; // bachelor momentum (global)
93 Double32_t fBachMomCov[6]; // covariance matrix of the bachelor momentum.
94 Int_t fPdgCodeXi; // reconstructed cascade type (PDG code)
95 Int_t fBachIdx; // label of the bachelor track
101 ClassDef(AliESDcascade,5) // reconstructed cascade vertex
105 void AliESDcascade::SetDcaXiDaughters(Double_t rDcaXiDaughters){
106 fDcaXiDaughters=rDcaXiDaughters;