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b6d061b7 1#ifndef ALIQUENCHINGWEIGHTS_H
2#define ALIQUENCHINGWEIGHTS_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// Implementation of the class to calculate the parton energy loss
10// Based on the "BDMPS" quenching weights by C.A.Salgado and U.A.Wiedemann
11//
12// References:
13// C.A.Salgado and U.A.Wiedemann, Phys.Rev.D68 (2003) 014008 [hep-ph/0302184]
14// A.Dainese, Eur.Phys.J.C, in press, [nucl-ex/0312005]
15//
16// Origin: C. Loizides constantin.loizides@cern.ch
17// A. Dainese andrea.dainese@pd.infn.it
18//----------------------------------------------------------------------------
19
20#include <TObject.h>
21class TH1F;
22
23class AliQuenchingWeights : public TObject {
24 public:
25 enum kECMethod {kDefault=0,kReweight=1};
26
27 AliQuenchingWeights();
28 AliQuenchingWeights(const AliQuenchingWeights& a);
29 virtual ~AliQuenchingWeights();
30
31 void Reset();
32 Int_t SampleEnergyLoss();
7258586f 33 Int_t SampleEnergyLoss(Int_t ipart, Double_t R);
34
35 Double_t GetELossRandom(Int_t ipart, Double_t length, Double_t e=1.e10) const;
b6d061b7 36 Double_t CalcQuenchedEnergy(Int_t ipart, Double_t length, Double_t e) const;
7258586f 37 Double_t GetELossRandom(Int_t ipart, TH1F *hell, Double_t e=1.e10) const;
b6d061b7 38 Double_t CalcQuenchedEnergy(Int_t ipart, TH1F *hell, Double_t e) const;
7258586f 39 Double_t GetELossRandomK(Int_t ipart, Double_t I0, Double_t I1, Double_t e=1.e10);
40 Double_t CalcQuenchedEnergyK(Int_t ipart, Double_t I0, Double_t I1, Double_t e);
2552c51a 41 Double_t GetELossRandomKFast(Int_t ipart, Double_t I0, Double_t I1, Double_t e=1.e10);
cc885e36 42 Double_t GetELossRandomKFastR(Int_t ipart, Double_t R, Double_t wc, Double_t e=1.e10);
2552c51a 43 Double_t CalcQuenchedEnergyKFast(Int_t ipart, Double_t I0, Double_t I1, Double_t e);
7258586f 44
b6d061b7 45 //multiple soft scattering approximation
46 Int_t InitMult(const Char_t *contall="$(ALICE_ROOT)/FASTSIM/data/cont_mult.all",
47 const Char_t *discall="$(ALICE_ROOT)/FASTSIM/data/disc_mult.all");
48
49 //single hard scattering approximation
50 Int_t InitSingleHard(const Char_t *contall="$(ALICE_ROOT)/FASTSIM/data/cont_lin.all",
51 const Char_t *discall="$(ALICE_ROOT)/FASTSIM/data/disc_lin.all");
52
53 Int_t CalcMult(Int_t ipart, Double_t rrrr,Double_t xxxx,
54 Double_t &continuous,Double_t &discrete) const;
55 Int_t CalcMult(Int_t ipart,
56 Double_t w, Double_t qtransp, Double_t length,
57 Double_t &continuous,Double_t &discrete) const;
58 Int_t CalcSingleHard(Int_t ipart, Double_t rrrr,Double_t xxxx,
59 Double_t &continuous,Double_t &discrete) const;
60 Int_t CalcSingleHard(Int_t ipart,
61 Double_t w, Double_t mu, Double_t length,
62 Double_t &continuous,Double_t &discrete) const;
63
64 Double_t CalcWC(Double_t q, Double_t l) const
7a76a12e 65 {return 0.5*q*l*l*fgkConvFmToInvGeV;}
b6d061b7 66
67 Double_t CalcWCbar(Double_t mu, Double_t l) const
7a76a12e 68 {return 0.5*mu*mu*l*fgkConvFmToInvGeV;}
b6d061b7 69
70 Double_t CalcWC(Double_t l) const
71 {if(fMultSoft) return CalcWC(fQTransport,l);
72 else return CalcWCbar(fMu,l);}
73
7258586f 74 Double_t CalcWCk(Double_t I1) const
75 {if(fMultSoft) return CalcWCk(fK,I1);
76 else return -1;} //not implemented!
77
78 Double_t CalcWCk(Double_t k, Double_t I1) const
79 {if(fMultSoft) return k*I1/fgkConvFmToInvGeV;
80 else return -1;} //not implemented!
81
b6d061b7 82 Double_t CalcR(Double_t wc, Double_t l) const;
83
7258586f 84 Double_t CalcRk(Double_t I0, Double_t I1) const
85 {return CalcRk(fK,I0,I1);}
86
87 Double_t CalcRk(Double_t k, Double_t I0, Double_t I1) const;
88
89 Double_t CalcQk(Double_t I0, Double_t I1) const
90 {return CalcQk(fK,I0,I1);}
91
92 Double_t CalcQk(Double_t k, Double_t I0, Double_t I1) const
cc885e36 93 {return I0*I0/2./I1/fgkConvFmToInvGeV/fgkConvFmToInvGeV*k;}
6bd26c4a 94
95 Double_t CalcLk(Double_t i0, Double_t i1) const
96 {return 2.*i1/i0;}
7258586f 97
b6d061b7 98 Int_t CalcLengthMax(Double_t q) const
7a76a12e 99 {Double_t l3max=fgkRMax/.5/q/fgkConvFmToInvGeV/fgkConvFmToInvGeV;
b6d061b7 100 return (Int_t)TMath::Power(l3max,1./3.);}
101
7258586f 102 const TH1F* GetHisto(Int_t ipart,Double_t length) const;
b6d061b7 103
104 void SetMu(Double_t m=1.) {fMu=m;}
105 void SetQTransport(Double_t q=1.) {fQTransport=q;}
7258586f 106 void SetK(Double_t k=4.e5) {fK=k;} //about 1 GeV^2/fm
b6d061b7 107 void SetECMethod(kECMethod type=kDefault);
108 void SetLengthMax(Int_t l=20) {fLengthMax=l;}
109
110 Float_t GetMu() const {return fMu;}
111 Float_t GetQTransport() const {return fQTransport;}
7258586f 112 Float_t GetK() const {return fK;}
b6d061b7 113 Bool_t GetECMethod() const {return fECMethod;}
114 Bool_t GetTablesLoaded() const {return fTablesLoaded;}
115 Bool_t GetMultSoft() const {return fMultSoft;}
116 Int_t GetLengthMax() const {return fLengthMax;}
117
118 TH1F* ComputeQWHisto (Int_t ipart,Double_t medval,Double_t length) const;
119 TH1F* ComputeQWHistoX(Int_t ipart,Double_t medval,Double_t length) const;
7258586f 120 TH1F* ComputeQWHistoX(Int_t ipart,Double_t R) const;
121 TH1F* ComputeELossHisto(Int_t ipart,Double_t medval,Double_t l,Double_t e=1.e10) const;
122 TH1F* ComputeELossHisto(Int_t ipart,Double_t medval,TH1F *hEll,Double_t e=1.e10) const;
123 TH1F* ComputeELossHisto(Int_t ipart,Double_t R) const;
124
125 Double_t GetMeanELoss(Int_t ipart,Double_t medval,Double_t l) const;
126 Double_t GetMeanELoss(Int_t ipart,Double_t medval,TH1F *hEll) const;
127 Double_t GetMeanELoss(Int_t ipart,Double_t R) const;
b6d061b7 128
7258586f 129 void PlotDiscreteWeights(Double_t len=4) const;
130 void PlotContWeights(Int_t itype,Double_t len) const;
131 void PlotContWeightsVsL(Int_t itype,Double_t medval) const;
132 void PlotAvgELoss(Double_t len ,Double_t e=1.e10) const;
133 void PlotAvgELoss(TH1F *hEll,Double_t e=1.e10) const;
9d851d20 134 void PlotAvgELossVsL(Double_t e=1.e10) const;
7258586f 135 void PlotAvgELossVsPt(Double_t medval,Double_t len) const;
136 void PlotAvgELossVsPt(Double_t medval,TH1F *hEll) const;
b6d061b7 137
138 protected:
7258586f 139 Int_t GetIndex(Double_t len) const;
140
7a76a12e 141 static const Double_t fgkConvFmToInvGeV; //conversion factor
2552c51a 142 static const Int_t fgkBins; //number of bins for hists
143 static const Double_t fgkMaxBin; //max. value of wc
7258586f 144 static const Double_t fgkRMax; //max. tabled value of R
145
7a76a12e 146 static Int_t fgCounter;//static instance counter
147 Int_t fInstanceNumber; //instance number of class
b6d061b7 148
149 Bool_t fMultSoft; //approximation type
150 Bool_t fECMethod; //energy constraint method
7258586f 151 Double_t fQTransport; //transport coefficient [GeV^2/fm]]
b6d061b7 152 Double_t fMu; //Debye screening mass
7258586f 153 Double_t fK; //proportional constant [fm]
b6d061b7 154 Int_t fLengthMax; //maximum length
155 Int_t fLengthMaxOld; //maximum length used for histos
156
157 //discrete and cont part of quenching for
158 //both parton type and different lengths
159 TH1F ***fHistos; //!
7258586f 160 TH1F *fHisto; //!
b6d061b7 161
162 // data strucs for tables
7a76a12e 163 Double_t fxx[400]; //sampled energy quark
164 Double_t fxxg[400]; //sampled energy gluon
165 Double_t fdaq[34]; //discrete weight quark
166 Double_t fdag[34]; //discrete weight gluon
167 Double_t fcaq[34][261]; //continuous weights quarks
168 Double_t fcag[34][261]; //continuous weights gluons
169 Double_t frrr[34]; //r value quark
170 Double_t frrrg[34]; //r value gluon
171 Bool_t fTablesLoaded; //tables loaded
b6d061b7 172
173 ClassDef(AliQuenchingWeights,1) // Base class for Quenching Weights
174};
175
176#endif