3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
9 // Class to generate particles from using parametrized pT and y distributions.
10 // Distributions are obtained from pointer to object of type AliGenLib.
11 // (For example AliGenMUONlib)
13 // andreas.morsch@cern.ch
23 typedef enum { kAnalog, kNonAnalog} Weighting_t;
24 //-------------------------------------------------------------
25 class AliGenParam : public AliGenMC
29 AliGenParam(Int_t npart, const AliGenLib * Library, Int_t param, const char* tname = 0);
30 AliGenParam(Int_t npart, Int_t param, const char* tname = 0, const char* name = 0);
31 AliGenParam(Int_t npart, Int_t param,
32 Double_t (*PtPara)(const Double_t*, const Double_t*),
33 Double_t (*YPara )(const Double_t*, const Double_t*),
34 Double_t (*V2Para)(const Double_t*, const Double_t*),
35 Int_t (*IpPara)(TRandom*) );
37 virtual ~AliGenParam();
38 virtual void GenerateN(Int_t ntimes);
39 virtual void Generate();
41 // select particle type
42 virtual void SetParam(Int_t param) {fParam = param;}
43 //Setting the flag for Background transportation while using SetForceDecay()
44 void SetSelectAll(Bool_t selectall) {fSelectAll = selectall;}
46 virtual void SetWeighting(Weighting_t flag = kAnalog) {fAnalog = flag;}
47 virtual void SetDeltaPt(Float_t delta=0.01) {fDeltaPt = delta;}
48 virtual void SetDecayer(AliDecayer* decayer) {fDecayer = decayer;}
49 virtual void Draw(const char * opt);
50 TF1 * GetPt() { return fPtPara;}
51 TF1 * GetY() {return fYPara;}
52 Float_t GetRelativeArea(Float_t ptMin, Float_t ptMax, Float_t yMin, Float_t yMax, Float_t phiMin, Float_t phiMax);
55 Double_t (*fPtParaFunc)(const Double_t*, const Double_t*); //! Pointer to Pt parametrisation function
56 Double_t (*fYParaFunc )(const Double_t*, const Double_t*); //! Pointer to Y parametrisation function
57 Int_t (*fIpParaFunc )(TRandom*); //! Pointer to particle type parametrisation function
58 Double_t (*fV2ParaFunc )(const Double_t*, const Double_t*);//! Pointer to V2 parametrisation function
59 TF1* fPtPara; // Transverse momentum parameterisation
60 TF1* fYPara; // Rapidity parameterisation
61 TF1* fV2Para; // v2 parametrization
62 TF1* fdNdPhi; // Phi distribution depending on v2
63 Int_t fParam; // Parameterisation type
64 Float_t fdNdy0; // central multiplicity per event
65 Float_t fYWgt; // Y-weight
66 Float_t fPtWgt; // Pt-weight
67 Float_t fBias; // Biasing factor
68 Int_t fTrials; // Number of trials
69 Float_t fDeltaPt; // pT sampling in steps of fDeltaPt
70 Bool_t fSelectAll; // Flag for transportation of Background while using SetForceDecay()
71 AliDecayer *fDecayer; // ! Pointer to pythia object for decays
74 AliGenParam(const AliGenParam &Param);
75 AliGenParam & operator=(const AliGenParam & rhs);
77 ClassDef(AliGenParam, 2) // Generator using parameterised pt- and y-distribution