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, AliGenLib * Library, Int_t param, 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)(Double_t*, Double_t*),
33 Double_t (*YPara )(Double_t*, Double_t*),
34 Int_t (*IpPara)(TRandom*) );
35 AliGenParam(const AliGenParam &Param);
37 virtual ~AliGenParam();
38 virtual void Generate();
40 // select particle type
41 virtual void SetParam(Int_t param) {fParam = param;}
43 virtual void SetWeighting(Weighting_t flag = kAnalog) {fAnalog = flag;}
44 virtual void SetDeltaPt(Float_t delta=0.01) {fDeltaPt = delta;}
45 virtual void SetDecayer(AliDecayer* decayer) {fDecayer = decayer;}
46 virtual void Draw(const char * opt);
47 TF1 * GetPt() { return fPtPara;}
48 TF1 * GetY() {return fYPara;}
49 Float_t GetRelativeArea(Float_t ptMin, Float_t ptMax, Float_t yMin, Float_t yMax, Float_t phiMin, Float_t phiMax);
51 AliGenParam & operator=(const AliGenParam & rhs);
53 Double_t (*fPtParaFunc)(Double_t*, Double_t*); //! Pointer to Pt parametrisation function
54 Double_t (*fYParaFunc )(Double_t*, Double_t*); //! Pointer to Y parametrisation function
55 Int_t (*fIpParaFunc )(TRandom*); //! Pointer to particle type parametrisation function
56 TF1* fPtPara; // Transverse momentum parameterisation
57 TF1* fYPara; // Rapidity parameterisation
58 Int_t fParam; // Parameterisation type
59 Float_t fdNdy0; // central multiplicity per event
60 Float_t fYWgt; // Y-weight
61 Float_t fPtWgt; // Pt-weight
62 Float_t fBias; // Biasing factor
63 Int_t fTrials; // Number of trials
64 Float_t fDeltaPt; // pT sampling in steps of fDeltaPt
65 AliDecayer *fDecayer; // ! Pointer to pythia object for decays
66 ClassDef(AliGenParam,1) // Generator using parameterised pt- and y-distribution