Possibility to force transport of all particles.
[u/mrichter/AliRoot.git] / EVGEN / AliGenParam.h
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1#ifndef ALIGENPARAM_H
2#define ALIGENPARAM_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
8//
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)
12//
13// andreas.morsch@cern.ch
14//
15
16#include "AliGenMC.h"
17
18class AliPythia;
19class TParticle;
20class AliGenLib;
21class TF1;
22
23typedef enum { kAnalog, kNonAnalog} Weighting_t;
24//-------------------------------------------------------------
25class AliGenParam : public AliGenMC
26{
27 public:
28 AliGenParam();
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 Int_t (*IpPara)(TRandom*) );
35
36 virtual ~AliGenParam();
37 virtual void Generate();
38 virtual void Init();
39 // select particle type
40 virtual void SetParam(Int_t param) {fParam = param;}
41 //Setting the flag for Background transportation while using SetForceDecay()
42 void SetSelectAll(Bool_t selectall) {fSelectAll = selectall;}
43 // force decay type
44 virtual void SetWeighting(Weighting_t flag = kAnalog) {fAnalog = flag;}
45 virtual void SetDeltaPt(Float_t delta=0.01) {fDeltaPt = delta;}
46 virtual void SetDecayer(AliDecayer* decayer) {fDecayer = decayer;}
47 virtual void Draw(const char * opt);
48 TF1 * GetPt() { return fPtPara;}
49 TF1 * GetY() {return fYPara;}
50 Float_t GetRelativeArea(Float_t ptMin, Float_t ptMax, Float_t yMin, Float_t yMax, Float_t phiMin, Float_t phiMax);
51
52 protected:
53 Double_t (*fPtParaFunc)(const Double_t*, const Double_t*); //! Pointer to Pt parametrisation function
54 Double_t (*fYParaFunc )(const Double_t*, const 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 Bool_t fSelectAll; // Flag for transportation of Background while using SetForceDecay()
66 AliDecayer *fDecayer; // ! Pointer to pythia object for decays
67
68 private:
69 AliGenParam(const AliGenParam &Param);
70 AliGenParam & operator=(const AliGenParam & rhs);
71
72 ClassDef(AliGenParam, 2) // Generator using parameterised pt- and y-distribution
73};
74#endif
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