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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> | |
21 | class TH1F; | |
22 | ||
23 | class 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; |
39 | ||
7258586f | 40 | Double_t GetELossRandomK(Int_t ipart, Double_t I0, Double_t I1, Double_t e=1.e10); |
41 | Double_t CalcQuenchedEnergyK(Int_t ipart, Double_t I0, Double_t I1, Double_t e); | |
42 | ||
b6d061b7 | 43 | //multiple soft scattering approximation |
44 | Int_t InitMult(const Char_t *contall="$(ALICE_ROOT)/FASTSIM/data/cont_mult.all", | |
45 | const Char_t *discall="$(ALICE_ROOT)/FASTSIM/data/disc_mult.all"); | |
46 | ||
47 | //single hard scattering approximation | |
48 | Int_t InitSingleHard(const Char_t *contall="$(ALICE_ROOT)/FASTSIM/data/cont_lin.all", | |
49 | const Char_t *discall="$(ALICE_ROOT)/FASTSIM/data/disc_lin.all"); | |
50 | ||
51 | Int_t CalcMult(Int_t ipart, Double_t rrrr,Double_t xxxx, | |
52 | Double_t &continuous,Double_t &discrete) const; | |
53 | Int_t CalcMult(Int_t ipart, | |
54 | Double_t w, Double_t qtransp, Double_t length, | |
55 | Double_t &continuous,Double_t &discrete) const; | |
56 | Int_t CalcSingleHard(Int_t ipart, Double_t rrrr,Double_t xxxx, | |
57 | Double_t &continuous,Double_t &discrete) const; | |
58 | Int_t CalcSingleHard(Int_t ipart, | |
59 | Double_t w, Double_t mu, Double_t length, | |
60 | Double_t &continuous,Double_t &discrete) const; | |
61 | ||
62 | Double_t CalcWC(Double_t q, Double_t l) const | |
7a76a12e | 63 | {return 0.5*q*l*l*fgkConvFmToInvGeV;} |
b6d061b7 | 64 | |
65 | Double_t CalcWCbar(Double_t mu, Double_t l) const | |
7a76a12e | 66 | {return 0.5*mu*mu*l*fgkConvFmToInvGeV;} |
b6d061b7 | 67 | |
68 | Double_t CalcWC(Double_t l) const | |
69 | {if(fMultSoft) return CalcWC(fQTransport,l); | |
70 | else return CalcWCbar(fMu,l);} | |
71 | ||
7258586f | 72 | Double_t CalcWCk(Double_t I1) const |
73 | {if(fMultSoft) return CalcWCk(fK,I1); | |
74 | else return -1;} //not implemented! | |
75 | ||
76 | Double_t CalcWCk(Double_t k, Double_t I1) const | |
77 | {if(fMultSoft) return k*I1/fgkConvFmToInvGeV; | |
78 | else return -1;} //not implemented! | |
79 | ||
b6d061b7 | 80 | Double_t CalcR(Double_t wc, Double_t l) const; |
81 | ||
7258586f | 82 | Double_t CalcRk(Double_t I0, Double_t I1) const |
83 | {return CalcRk(fK,I0,I1);} | |
84 | ||
85 | Double_t CalcRk(Double_t k, Double_t I0, Double_t I1) const; | |
86 | ||
87 | Double_t CalcQk(Double_t I0, Double_t I1) const | |
88 | {return CalcQk(fK,I0,I1);} | |
89 | ||
90 | Double_t CalcQk(Double_t k, Double_t I0, Double_t I1) const | |
91 | {return I0*I0/2/I1/fgkConvFmToInvGeV/fgkConvFmToInvGeV*k;} | |
92 | ||
b6d061b7 | 93 | Int_t CalcLengthMax(Double_t q) const |
7a76a12e | 94 | {Double_t l3max=fgkRMax/.5/q/fgkConvFmToInvGeV/fgkConvFmToInvGeV; |
b6d061b7 | 95 | return (Int_t)TMath::Power(l3max,1./3.);} |
96 | ||
7258586f | 97 | const TH1F* GetHisto(Int_t ipart,Double_t length) const; |
b6d061b7 | 98 | |
99 | void SetMu(Double_t m=1.) {fMu=m;} | |
100 | void SetQTransport(Double_t q=1.) {fQTransport=q;} | |
7258586f | 101 | void SetK(Double_t k=4.e5) {fK=k;} //about 1 GeV^2/fm |
b6d061b7 | 102 | void SetECMethod(kECMethod type=kDefault); |
103 | void SetLengthMax(Int_t l=20) {fLengthMax=l;} | |
104 | ||
105 | Float_t GetMu() const {return fMu;} | |
106 | Float_t GetQTransport() const {return fQTransport;} | |
7258586f | 107 | Float_t GetK() const {return fK;} |
b6d061b7 | 108 | Bool_t GetECMethod() const {return fECMethod;} |
109 | Bool_t GetTablesLoaded() const {return fTablesLoaded;} | |
110 | Bool_t GetMultSoft() const {return fMultSoft;} | |
111 | Int_t GetLengthMax() const {return fLengthMax;} | |
112 | ||
113 | TH1F* ComputeQWHisto (Int_t ipart,Double_t medval,Double_t length) const; | |
114 | TH1F* ComputeQWHistoX(Int_t ipart,Double_t medval,Double_t length) const; | |
7258586f | 115 | TH1F* ComputeQWHistoX(Int_t ipart,Double_t R) const; |
116 | TH1F* ComputeELossHisto(Int_t ipart,Double_t medval,Double_t l,Double_t e=1.e10) const; | |
117 | TH1F* ComputeELossHisto(Int_t ipart,Double_t medval,TH1F *hEll,Double_t e=1.e10) const; | |
118 | TH1F* ComputeELossHisto(Int_t ipart,Double_t R) const; | |
119 | ||
120 | Double_t GetMeanELoss(Int_t ipart,Double_t medval,Double_t l) const; | |
121 | Double_t GetMeanELoss(Int_t ipart,Double_t medval,TH1F *hEll) const; | |
122 | Double_t GetMeanELoss(Int_t ipart,Double_t R) const; | |
b6d061b7 | 123 | |
7258586f | 124 | void PlotDiscreteWeights(Double_t len=4) const; |
125 | void PlotContWeights(Int_t itype,Double_t len) const; | |
126 | void PlotContWeightsVsL(Int_t itype,Double_t medval) const; | |
127 | void PlotAvgELoss(Double_t len ,Double_t e=1.e10) const; | |
128 | void PlotAvgELoss(TH1F *hEll,Double_t e=1.e10) const; | |
9d851d20 | 129 | void PlotAvgELossVsL(Double_t e=1.e10) const; |
7258586f | 130 | void PlotAvgELossVsPt(Double_t medval,Double_t len) const; |
131 | void PlotAvgELossVsPt(Double_t medval,TH1F *hEll) const; | |
b6d061b7 | 132 | |
133 | protected: | |
7258586f | 134 | Int_t GetIndex(Double_t len) const; |
135 | ||
7a76a12e | 136 | static const Double_t fgkConvFmToInvGeV; //conversion factor |
7258586f | 137 | static const Int_t fgBins; //number of bins for hists |
138 | static const Double_t fgMaxBin; //max. value of wc | |
139 | static const Double_t fgkRMax; //max. tabled value of R | |
140 | ||
7a76a12e | 141 | static Int_t fgCounter;//static instance counter |
142 | Int_t fInstanceNumber; //instance number of class | |
b6d061b7 | 143 | |
144 | Bool_t fMultSoft; //approximation type | |
145 | Bool_t fECMethod; //energy constraint method | |
7258586f | 146 | Double_t fQTransport; //transport coefficient [GeV^2/fm]] |
b6d061b7 | 147 | Double_t fMu; //Debye screening mass |
7258586f | 148 | Double_t fK; //proportional constant [fm] |
b6d061b7 | 149 | Int_t fLengthMax; //maximum length |
150 | Int_t fLengthMaxOld; //maximum length used for histos | |
151 | ||
152 | //discrete and cont part of quenching for | |
153 | //both parton type and different lengths | |
154 | TH1F ***fHistos; //! | |
7258586f | 155 | TH1F *fHisto; //! |
b6d061b7 | 156 | |
157 | // data strucs for tables | |
7a76a12e | 158 | Double_t fxx[400]; //sampled energy quark |
159 | Double_t fxxg[400]; //sampled energy gluon | |
160 | Double_t fdaq[34]; //discrete weight quark | |
161 | Double_t fdag[34]; //discrete weight gluon | |
162 | Double_t fcaq[34][261]; //continuous weights quarks | |
163 | Double_t fcag[34][261]; //continuous weights gluons | |
164 | Double_t frrr[34]; //r value quark | |
165 | Double_t frrrg[34]; //r value gluon | |
166 | Bool_t fTablesLoaded; //tables loaded | |
b6d061b7 | 167 | |
168 | ClassDef(AliQuenchingWeights,1) // Base class for Quenching Weights | |
169 | }; | |
170 | ||
171 | #endif |