3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 ///////////////////////////////////////////////////////////
10 // Class to generate the particles for the MC //
11 // The base class is empty //
13 ///////////////////////////////////////////////////////////
16 #include <TLorentzVector.h>
17 #include <TMCProcess.h>
21 class AliCollisionGeometry;
28 typedef enum { kNoSmear, kPerEvent, kPerTrack } VertexSmear_t;
29 typedef enum { kExternal, kInternal} VertexSource_t;
32 class AliGenerator : public TNamed, public AliRndm
37 AliGenerator(Int_t npart);
38 AliGenerator(const AliGenerator &gen);
39 virtual ~AliGenerator();
41 void Copy(AliGenerator &gen) const;
42 virtual void SetOrigin(Float_t ox, Float_t oy, Float_t oz);
43 virtual void SetOrigin(const TLorentzVector &o);
44 virtual void SetSigma(Float_t sx, Float_t sy, Float_t sz);
45 virtual void SetMomentumRange(Float_t pmin=0, Float_t pmax=1.e10);
46 virtual void SetPtRange(Float_t ptmin=0, Float_t ptmax=1.e10);
47 virtual void SetPhiRange(Float_t phimin=-180., Float_t phimax=180);
48 virtual void SetYRange(Float_t ymin=-100, Float_t ymax=100);
49 virtual void SetVRange(Float_t vxmin, Float_t vxmax,
50 Float_t vymin, Float_t vymax,
51 Float_t vzmin, Float_t vzmax);
52 virtual void SetNumberParticles(Int_t npart=100) {fNpart=npart;}
53 virtual Int_t NumberParticles() const {return fNpart;}
54 virtual void SetThetaRange(Float_t thetamin=0, Float_t thetamax=180);
55 virtual void Generate()=0;
56 virtual void SetParentWeight(Float_t wgt) {fParentWeight=wgt;}
57 virtual void SetChildWeight(Float_t wgt) {fChildWeight=wgt;}
58 virtual void SetAnalog(Int_t flag=1) {fAnalog=flag;}
59 virtual void SetVertexSmear(VertexSmear_t smear) {fVertexSmear = smear;}
60 virtual void SetCutVertexZ(Float_t cut=999999.) {fCutVertexZ = cut;}
61 virtual void SetVertexSource(VertexSource_t) {fVertexSource = kInternal;}
62 virtual void SetTrackingFlag(Int_t flag=1) {fTrackIt=flag;}
64 void VertexExternal();
65 virtual void VertexInternal();
66 virtual void FinishRun(){;}
68 virtual void SetMC(TGenerator *theMC)
69 {if (!fgMCEvGen) fgMCEvGen =theMC;}
71 AliGenerator & operator=(const AliGenerator &gen);
75 virtual void GetOrigin(Float_t &ox, Float_t &oy, Float_t &oz) const
76 {ox=fOrigin.At(0);oy=fOrigin.At(1);oz=fOrigin.At(2);}
77 virtual void GetOrigin(TLorentzVector &o) const
78 {o[0]=fOrigin.At(0);o[1]=fOrigin.At(1);o[2]=fOrigin.At(2);o[3]=0;}
80 void SetStack (AliStack *stack) {fStack = stack;}
81 AliStack* GetStack(){return fStack;}
83 virtual Bool_t ProvidesCollisionGeometry() const {return kFALSE;}
84 virtual Bool_t NeedsCollisionGeometry() const {return kFALSE;}
85 virtual AliCollisionGeometry* CollisionGeometry() {return fCollisionGeometry;}
86 virtual void SetCollisionGeometry(AliCollisionGeometry* geom) {fCollisionGeometry = geom;}
88 virtual void SetTrack(Int_t done, Int_t parent, Int_t pdg,
89 Float_t *pmom, Float_t *vpos, Float_t *polar,
90 Float_t tof, TMCProcess mech, Int_t &ntr,
91 Float_t weight = 1, Int_t is = 0);
92 virtual void SetTrack(Int_t done, Int_t parent, Int_t pdg,
93 Double_t px, Double_t py, Double_t pz, Double_t e,
94 Double_t vx, Double_t vy, Double_t vz, Double_t tof,
95 Double_t polx, Double_t poly, Double_t polz,
96 TMCProcess mech, Int_t &ntr, Float_t weight = 1, Int_t is = 0);
97 virtual void KeepTrack(Int_t itrack);
98 virtual void SetHighWaterMark(Int_t nt);
101 static TGenerator* fgMCEvGen; //Pointer to the generator
102 Float_t fThetaMin; //Minimum theta of generation in radians
103 Float_t fThetaMax; //Maximum theta of generation in radians
104 Float_t fPhiMin; //Minimum phi of generation in radians
105 Float_t fPhiMax; //Maximum phi of generation in radians
106 Float_t fPMin; //Minimum momentum of generation in GeV/c
107 Float_t fPMax; //Minimum momentum of generation in GeV/c
108 Float_t fPtMin; //Minimum transverse momentum
109 Float_t fPtMax; //Maximum transverse momentum
110 Float_t fYMin; //Minimum rapidity
111 Float_t fYMax; //Maximum rapidity
112 TArrayF fVMin; //Minimum Decaylength
113 TArrayF fVMax; //Minimum Decaylength
114 Int_t fNpart; //Maximum number of particles per event
115 Float_t fParentWeight; //Parent Weight
116 Float_t fChildWeight; //ChildWeight
117 Int_t fAnalog; //Flag for anolog or pt-weighted generation
119 VertexSmear_t fVertexSmear; //Vertex Smearing mode
120 VertexSource_t fVertexSource; //Vertex source (internal/external)
121 Float_t fCutVertexZ; // Vertex cut in units of sigma_z
122 Int_t fTrackIt; // if 1, Track final state particles
123 TArrayF fOrigin; // Origin of event
124 TArrayF fOsigma; // Sigma of the Origin of event
125 TArrayF fVertex; //! Vertex of current event
126 TArrayF fEventVertex; //!The current event vertex
128 AliStack* fStack; //! Local pointer to stack
129 AliCollisionGeometry* fCollisionGeometry; //!Collision geometry
130 /*************************************************************************/
131 enum {kThetaRange = BIT(14),
132 kVertexRange = BIT(15),
136 kMomentumRange = BIT(19)
138 ClassDef(AliGenerator,3) // Base class for event generators