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 AliVertexGenerator;
22 class AliCollisionGeometry;
29 typedef enum { kNoSmear, kPerEvent, kPerTrack } VertexSmear_t;
30 typedef enum { kExternal, kInternal, kContainer} VertexSource_t;
33 class AliGenerator : public TNamed, public AliRndm
38 AliGenerator(Int_t npart);
39 AliGenerator(const AliGenerator &gen);
40 virtual ~AliGenerator();
42 void Copy(TObject &gen) const;
43 virtual void SetOrigin(Float_t ox, Float_t oy, Float_t oz);
44 virtual void SetOrigin(const TLorentzVector &o);
45 virtual void SetSigma(Float_t sx, Float_t sy, Float_t sz);
46 virtual void SetMomentumRange(Float_t pmin=0, Float_t pmax=1.e10);
47 virtual void SetPtRange(Float_t ptmin=0, Float_t ptmax=1.e10);
48 virtual void SetPhiRange(Float_t phimin = 0., Float_t phimax = 360.);
49 virtual void SetYRange(Float_t ymin=-100, Float_t ymax=100);
50 virtual void SetVRange(Float_t vxmin, Float_t vxmax,
51 Float_t vymin, Float_t vymax,
52 Float_t vzmin, Float_t vzmax);
53 virtual void SetNumberParticles(Int_t npart=100) {fNpart=npart;}
54 virtual Int_t NumberParticles() const {return fNpart;}
55 virtual void SetThetaRange(Float_t thetamin=0, Float_t thetamax=180);
56 virtual void Generate()=0;
57 virtual void SetParentWeight(Float_t wgt) {fParentWeight=wgt;}
58 virtual void SetChildWeight(Float_t wgt) {fChildWeight=wgt;}
59 virtual void SetAnalog(Int_t flag=1) {fAnalog=flag;}
60 virtual void SetVertexSmear(VertexSmear_t smear) {fVertexSmear = smear;}
61 virtual void SetCutVertexZ(Float_t cut=999999.) {fCutVertexZ = cut;}
62 virtual void SetVertexSource(VertexSource_t source = kInternal) {fVertexSource = source;}
63 virtual void SetVertex(Float_t vx, Float_t vy, Float_t vz)
64 {fVertex[0] = vx; fVertex[1] = vy; fVertex[2] = vz;}
65 void SetVertexGenerator(AliVertexGenerator* vertexGenerator)
66 {fVertexGenerator = vertexGenerator; fVertexSource = kExternal; fVertexSmear = kPerEvent;}
67 virtual void SetTrackingFlag(Int_t flag=1) {fTrackIt=flag;}
69 void VertexExternal();
70 virtual void VertexInternal();
71 virtual void FinishRun();
72 virtual void SetMC(TGenerator *theMC) {fMCEvGen =theMC;}
73 AliGenerator & operator=(const AliGenerator &gen);
77 virtual void GetOrigin(Float_t &ox, Float_t &oy, Float_t &oz) const
78 {ox=fOrigin.At(0);oy=fOrigin.At(1);oz=fOrigin.At(2);}
79 virtual void GetOrigin(TLorentzVector &o) const
80 {o[0]=fOrigin.At(0);o[1]=fOrigin.At(1);o[2]=fOrigin.At(2);o[3]=0;}
82 void SetStack (AliStack *stack) {fStack = stack;}
83 AliStack* GetStack(){return fStack;}
85 virtual Bool_t ProvidesCollisionGeometry() const {return kFALSE;}
86 virtual Bool_t NeedsCollisionGeometry() const {return kFALSE;}
87 virtual AliCollisionGeometry* CollisionGeometry() const {return fCollisionGeometry;}
88 virtual void SetCollisionGeometry(AliCollisionGeometry* geom) {fCollisionGeometry = geom;}
90 virtual void PushTrack(Int_t done, Int_t parent, Int_t pdg,
91 Float_t *pmom, Float_t *vpos, Float_t *polar,
92 Float_t tof, TMCProcess mech, Int_t &ntr,
93 Float_t weight = 1, Int_t is = 0);
94 virtual void PushTrack(Int_t done, Int_t parent, Int_t pdg,
95 Double_t px, Double_t py, Double_t pz, Double_t e,
96 Double_t vx, Double_t vy, Double_t vz, Double_t tof,
97 Double_t polx, Double_t poly, Double_t polz,
98 TMCProcess mech, Int_t &ntr, Float_t weight = 1, Int_t is = 0);
99 virtual void KeepTrack(Int_t itrack);
100 virtual void SetHighWaterMark(Int_t nt);
103 TGenerator* fMCEvGen; //!Pointer to the generator
104 Float_t fThetaMin; //Minimum theta of generation in radians
105 Float_t fThetaMax; //Maximum theta of generation in radians
106 Float_t fPhiMin; //Minimum phi of generation in radians
107 Float_t fPhiMax; //Maximum phi of generation in radians
108 Float_t fPMin; //Minimum momentum of generation in GeV/c
109 Float_t fPMax; //Minimum momentum of generation in GeV/c
110 Float_t fPtMin; //Minimum transverse momentum
111 Float_t fPtMax; //Maximum transverse momentum
112 Float_t fYMin; //Minimum rapidity
113 Float_t fYMax; //Maximum rapidity
114 TArrayF fVMin; //Minimum Decaylength
115 TArrayF fVMax; //Minimum Decaylength
116 Int_t fNpart; //Maximum number of particles per event
117 Float_t fParentWeight; //Parent Weight
118 Float_t fChildWeight; //ChildWeight
119 Int_t fAnalog; //Flag for anolog or pt-weighted generation
121 VertexSmear_t fVertexSmear; //Vertex Smearing mode
122 VertexSource_t fVertexSource; //Vertex source (internal/external)
123 Float_t fCutVertexZ; // Vertex cut in units of sigma_z
124 Int_t fTrackIt; // if 1, Track final state particles
125 AliVertexGenerator* fVertexGenerator; //! Generator for the vertex
126 TArrayF fOrigin; // Origin of event
127 TArrayF fOsigma; // Sigma of the Origin of event
128 TArrayF fVertex; //! Vertex of current event
130 AliStack* fStack; //! Local pointer to stack
131 AliCollisionGeometry* fCollisionGeometry; //!Collision geometry
132 /*************************************************************************/
133 enum {kThetaRange = BIT(14),
134 kVertexRange = BIT(15),
138 kMomentumRange = BIT(19)
140 ClassDef(AliGenerator,3) // Base class for event generators