- correct minor issues with forcred gamma decays, and speed up
[u/mrichter/AliRoot.git] / EVGEN / AliGenParam.h
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34825e2b 1#ifndef ALIGENPARAM_H
2#define ALIGENPARAM_H
3da30618 3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
6d4dd317 8//
2ad38d56 9// Class to generate particles from using parametrized pT and y distributions.
6d4dd317 10// Distributions are obtained from pointer to object of type AliGenLib.
11// (For example AliGenMUONlib)
12//
13// andreas.morsch@cern.ch
14//
15
fff02fee 16#include "AliGenMC.h"
f87cfe57 17
18class AliPythia;
19class TParticle;
b22ee262 20class AliGenLib;
f87cfe57 21class TF1;
22
34f60c01 23typedef enum { kAnalog, kNonAnalog} Weighting_t;
fe4da5cc 24//-------------------------------------------------------------
fff02fee 25class AliGenParam : public AliGenMC
fe4da5cc 26{
6078e216 27public:
34825e2b 28 AliGenParam();
f2c13e03 29 AliGenParam(Int_t npart, const AliGenLib * Library, Int_t param, const char* tname = 0);
4725e0d2 30 AliGenParam(Int_t npart, Int_t param, const char* tname = 0, const char* name = 0);
34f60c01 31 AliGenParam(Int_t npart, Int_t param,
75e0cc59 32 Double_t (*PtPara)(const Double_t*, const Double_t*),
33 Double_t (*YPara )(const Double_t*, const Double_t*),
6078e216 34 Double_t (*V2Para)(const Double_t*, const Double_t*),
65fb704d 35 Int_t (*IpPara)(TRandom*) );
f87cfe57 36
34825e2b 37 virtual ~AliGenParam();
d5615b85 38 virtual void GenerateN(Int_t ntimes);
34825e2b 39 virtual void Generate();
40 virtual void Init();
41 // select particle type
34f60c01 42 virtual void SetParam(Int_t param) {fParam = param;}
18e09c20 43 //Setting the flag for Background transportation while using SetForceDecay()
44 void SetSelectAll(Bool_t selectall) {fSelectAll = selectall;}
34825e2b 45 // force decay type
34f60c01 46 virtual void SetWeighting(Weighting_t flag = kAnalog) {fAnalog = flag;}
34f60c01 47 virtual void SetDeltaPt(Float_t delta=0.01) {fDeltaPt = delta;}
a595093b 48 virtual void SetDecayer(AliDecayer* decayer) {fDecayer = decayer;}
4ae1c9f0 49 virtual void SetForceGammaConversion(Bool_t force=kTRUE) {fForceConv = force;}
dc1d768c 50 virtual void Draw(const char * opt);
2ad38d56 51 TF1 * GetPt() { return fPtPara;}
52 TF1 * GetY() {return fYPara;}
53 Float_t GetRelativeArea(Float_t ptMin, Float_t ptMax, Float_t yMin, Float_t yMax, Float_t phiMin, Float_t phiMax);
54
4ae1c9f0 55 static TVector3 OrthogonalVector(TVector3 &inVec);
71443190 56 static void RotateVector(Double_t *pin, Double_t *pout, Double_t costheta, Double_t sintheta,
57 Double_t cosphi, Double_t sinphi);
58 static double IntegratedKrollWada(Double_t mh);
59 static double ScreenFunction1(double d);
60 static double ScreenFunction2(double d);
61 double RandomEnergyFraction(double Z, double E);
62 double RandomPolarAngle();
63 double RandomMass(Double_t mh);
64 Int_t VirtualGammaPairProduction(TClonesArray *particles, Int_t nPart);
4ae1c9f0 65 Int_t ForceGammaConversion(TClonesArray *particles, Int_t nPart);
66
6078e216 67protected:
75e0cc59 68 Double_t (*fPtParaFunc)(const Double_t*, const Double_t*); //! Pointer to Pt parametrisation function
69 Double_t (*fYParaFunc )(const Double_t*, const Double_t*); //! Pointer to Y parametrisation function
65fb704d 70 Int_t (*fIpParaFunc )(TRandom*); //! Pointer to particle type parametrisation function
6078e216 71 Double_t (*fV2ParaFunc )(const Double_t*, const Double_t*);//! Pointer to V2 parametrisation function
c5c3e4b0 72 TF1* fPtPara; // Transverse momentum parameterisation
73 TF1* fYPara; // Rapidity parameterisation
6078e216 74 TF1* fV2Para; // v2 parametrization
75 TF1* fdNdPhi; // Phi distribution depending on v2
34f60c01 76 Int_t fParam; // Parameterisation type
4d9d5cbd 77 Float_t fdNdy0; // central multiplicity per event
78 Float_t fYWgt; // Y-weight
79 Float_t fPtWgt; // Pt-weight
4d9d5cbd 80 Float_t fBias; // Biasing factor
81 Int_t fTrials; // Number of trials
34825e2b 82 Float_t fDeltaPt; // pT sampling in steps of fDeltaPt
18e09c20 83 Bool_t fSelectAll; // Flag for transportation of Background while using SetForceDecay()
6c24ee7c 84 AliDecayer *fDecayer; // ! Pointer to pythia object for decays
4ae1c9f0 85 Bool_t fForceConv; //
93a2041b 86
6078e216 87private:
93a2041b 88 AliGenParam(const AliGenParam &Param);
89 AliGenParam & operator=(const AliGenParam & rhs);
90
18e09c20 91 ClassDef(AliGenParam, 2) // Generator using parameterised pt- and y-distribution
fe4da5cc 92};
93#endif
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