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