3 /* Copyright(c) 1998-2007, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 //-------------------------------------------------------------------------
9 // base class for ESD and AOD particles
10 // Author: Markus Oldenburg, CERN
11 //-------------------------------------------------------------------------
19 const Double_t kAlmost1=1. - Double_t(FLT_EPSILON);
20 const Double_t kAlmost0=Double_t(FLT_MIN);
22 const Double_t kB2C=-0.299792458e-3;
23 const Double_t kAlmost0Field=1.e-13;
25 class AliVParticle: public TObject {
29 virtual ~AliVParticle() { }
30 AliVParticle(const AliVParticle& vPart);
31 AliVParticle& operator=(const AliVParticle& vPart);
33 // constructor for reinitialisation of vtable
34 AliVParticle( AliVConstructorReinitialisationFlag ) :TObject(){}
37 virtual Double_t Px() const = 0;
38 virtual Double_t Py() const = 0;
39 virtual Double_t Pz() const = 0;
40 virtual Double_t Pt() const = 0;
41 virtual Double_t P() const = 0;
42 virtual Bool_t PxPyPz(Double_t p[3]) const = 0;
44 virtual Double_t Xv() const = 0;
45 virtual Double_t Yv() const = 0;
46 virtual Double_t Zv() const = 0;
47 virtual Bool_t XvYvZv(Double_t x[3]) const = 0;
49 virtual Double_t OneOverPt() const = 0;
50 virtual Double_t Phi() const = 0;
51 virtual Double_t Theta() const = 0;
54 virtual Double_t E() const = 0;
55 virtual Double_t M() const = 0;
57 virtual Double_t Eta() const = 0;
58 virtual Double_t Y() const = 0;
60 virtual Short_t Charge() const = 0;
61 virtual Int_t GetLabel() const = 0;
63 virtual Int_t PdgCode() const = 0;
64 virtual const Double_t *PID() const = 0; // return PID object (to be defined, still)
68 /** Compare this class with an other instance of this class
69 * used in a TCollection::Sort()/TClonesArray::Sort()
70 * @param obj ptr to other instance
71 * @return Returns 0 when equal, 1 when this is smaller
72 * and -1 when bigger -- sorts descending
74 Int_t Compare( const TObject* obj) const;
77 /** Defines this class as being sortable in a TCollection
78 * @return always kTRUE;
80 Bool_t IsSortable() const { return kTRUE; }
81 virtual Bool_t IsPrimary() const { return kFALSE; }
82 virtual void SetFlag(UInt_t) {;}
83 virtual UInt_t GetFlag() const {return 0;}
85 // coordinate system conversions
86 Bool_t Local2GlobalMomentum(Double_t p[3], Double_t alpha) const;
87 Bool_t Local2GlobalPosition(Double_t r[3], Double_t alpha) const;
88 Bool_t Global2LocalMomentum(Double_t p[3], Short_t charge, Double_t &alpha) const;
89 Bool_t Global2LocalPosition(Double_t r[3], Double_t alpha) const;
92 virtual Int_t GetMother() const {return -1;}
93 virtual Int_t GetFirstDaughter() const {return -1;}
94 virtual Int_t GetLastDaughter() const {return -1;}
95 virtual void SetGeneratorIndex(Short_t) {;}
96 virtual Short_t GetGeneratorIndex() const {return -1;}
97 ClassDef(AliVParticle, 3) // base class for particles