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1 | #ifndef ALIFASTGLAUBER_H | |
2 | #define ALIFASTGLAUBER_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 | // Utility class to make simple Glauber type calculations for collision geometries: | |
9 | // Impact parameter, production points, reaction plane dependence | |
10 | // Author: Andreas Morsch | |
11 | // andreas.morsch@cern.ch | |
12 | ||
13 | #include <TObject.h> | |
14 | #include <TString.h> | |
15 | class TF1; | |
16 | class TF2; | |
17 | ||
18 | ||
19 | class AliFastGlauber : public TObject { | |
20 | public: | |
21 | static AliFastGlauber* Instance(); | |
22 | virtual ~AliFastGlauber(); | |
23 | void Init(Int_t mode = 0); | |
24 | ||
25 | void SetWoodSaxonParameters(Double_t r0, Double_t d, Double_t w, Double_t n) | |
26 | {fWSr0 = r0; fWSd = d; fWSw = w; fWSn = n;} | |
27 | void SetWoodSaxonParametersAu() | |
28 | {fWSr0 = 6.38; fWSd = 0.535; fWSw = 0.; fWSn = 8.59e-4;} | |
29 | void SetWoodSaxonParametersPb() | |
30 | {fWSr0 = 6.78; fWSd = 0.54; fWSw = 0.; fWSn = 7.14e-4;} | |
31 | void SetMaxImpact(Float_t bmax = 20.) {fgBMax = bmax;}; | |
32 | void SetHardCrossSection(Float_t xs = 1.0) {fSigmaHard = xs;} | |
33 | void SetNNCrossSection (Float_t xs = 55.6) {fSigmaNN = xs;} | |
34 | void SetNucleus(Int_t n=208) {fA=n;} | |
35 | void SetAuAuRhic(); | |
36 | void SetPbPbLHC(); | |
37 | void SetFileName(const TString &fn){fName=fn;} | |
38 | void SetFileName(const char *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;} | |
39 | ||
40 | const TF1* GetWSB() const {return fgWSb;} | |
41 | const TF1* GetRWSB() const {return fgRWSb;} | |
42 | const TF2* GetWSbz() const {return fgWSbz;} | |
43 | const TF1* GetWSz() const {return fgWSz;} | |
44 | const TF1* GetWSta() const {return fgWSta;} | |
45 | const TF2* Kernel() const {return fgWStarfi;} | |
46 | const TF2* GetWStarfi() const {return fgWStarfi;} | |
47 | const TF2* GetWKParticipants() const {return fgWKParticipants;} | |
48 | const TF1* GetWParticipants() const {return fgWParticipants;} | |
49 | const TF1* Overlap() const {return fgWStaa;} | |
50 | const TF1* GetWStaa() const {return fgWStaa;} | |
51 | const TF2* GetWAlmond() const {return fgWAlmond;} | |
52 | const TF1* GetWPathLength0() const {return fgWPathLength0;} | |
53 | const TF1* GetWPathLength() const {return fgWPathLength;} | |
54 | const TF1* GetWIntRadius() const {return fgWIntRadius;} | |
55 | const TF1* GetWSgeo() const {return fgWSgeo;} | |
56 | const TF1* GetWSbinary() const {return fgWSbinary;} | |
57 | const TF1* GetWSN() const {return fgWSN;} | |
58 | const TF1* GetWEnergyDensity() const {return fgWEnergyDensity;} | |
59 | const TF2* GetWAlmondFixedB(Int_t i) const {return fgWAlmondFixedB[i];} | |
60 | ||
61 | Float_t GetWr0() const {return fWSr0;} | |
62 | Float_t GetWSd() const {return fWSd;} | |
63 | Float_t GetWSw() const {return fWSw;} | |
64 | Float_t GetWSn() const {return fWSn;} | |
65 | Float_t GetSigmaHard() const {return fSigmaHard;} | |
66 | Float_t GetSigmaNN() const {return fSigmaNN;} | |
67 | Int_t GetA() const {return fA;} | |
68 | const TString* GetFileName() const {return &fName;} | |
69 | Float_t GetBmin() const {return fBmin;} | |
70 | Float_t GetBmax() const {return fBmax;} | |
71 | ||
72 | void DrawWSb() const; | |
73 | void DrawThickness() const; | |
74 | void DrawOverlap() const; | |
75 | void DrawParticipants() const; | |
76 | void DrawGeo() const; | |
77 | void DrawBinary() const; | |
78 | void DrawN() const; | |
79 | void DrawKernel(Double_t b = 0.) const; | |
80 | void DrawAlmond(Double_t b = 0.) const; | |
81 | void DrawPathLength0(Double_t b = 0., Int_t iopt = 0) const; | |
82 | void DrawPathLength(Double_t b, Int_t ni = 1000, Int_t iopt = 0) const; | |
83 | void DrawIntRadius(Double_t b = 0.) const; | |
84 | void DrawEnergyDensity() const; | |
85 | ||
86 | Double_t CrossSection(Double_t b1, Double_t b2) const; | |
87 | Double_t HardCrossSection(Double_t b1, Double_t b2) const; | |
88 | Double_t NHard(Double_t b1, Double_t b2) const; | |
89 | Double_t FractionOfHardCrossSection(Double_t b1, Double_t b2) const; | |
90 | Double_t Binaries(Double_t b) const; | |
91 | Double_t GetNumberOfBinaries(Double_t b) const; | |
92 | Double_t Participants(Double_t b) const; | |
93 | Double_t GetNumberOfParticipants(Double_t b) const; | |
94 | Double_t GetNumberOfCollisions(Double_t b) const; | |
95 | Double_t GetNumberOfCollisionsPerEvent(Double_t b) const; | |
96 | Double_t MeanOverlap(Double_t b1, Double_t b2); | |
97 | Double_t MeanNumberOfCollisionsPerEvent(Double_t b1, Double_t b2); | |
98 | void SimulateTrigger(Int_t n); | |
99 | void GetRandom(Float_t& b, Float_t& p, Float_t& mult); | |
100 | void GetRandom(Int_t& bin, Bool_t& hard); | |
101 | Double_t GetRandomImpactParameter(Double_t bmin, Double_t bmax); | |
102 | ||
103 | void StoreFunctions() const; | |
104 | void StoreAlmonds() const; | |
105 | ||
106 | void SetLengthDefinition(Int_t def=1) {fEllDef=def;} | |
107 | Int_t GetLengthDef() const {return fEllDef;} | |
108 | void SetCentralityClass(Double_t xsecFrLow=0.0,Double_t xsecFrUp=0.1); | |
109 | void GetRandomBHard(Double_t& b); | |
110 | void GetRandomXY(Double_t& x,Double_t& y); | |
111 | void GetSavedXY(Double_t xy[2]) const {xy[0] = fXY[0]; xy[1] = fXY[1];} | |
112 | void GetSavedI0I1(Double_t i0i1[2]) const {i0i1[0] = fI0I1[0]; i0i1[1] = fI0I1[1];} | |
113 | void SaveXY(Double_t x, Double_t y) {fXY[0] = x; fXY[1] = y;} | |
114 | void SaveI0I1(Double_t i0, Double_t i1) {fI0I1[0] = i0; fI0I1[1] = i1;} | |
115 | ||
116 | void GetRandomPhi(Double_t& phi); | |
117 | Double_t CalculateLength(Double_t b=0.,Double_t x0=0.,Double_t y0=0., | |
118 | Double_t phi0=0.); | |
119 | void GetLengthAndPhi(Double_t& ell,Double_t &phi,Double_t b=-1.); | |
120 | void GetLength(Double_t& ell,Double_t b=-1.); | |
121 | void GetLengthsBackToBackAndPhi(Double_t& ell1,Double_t& ell2, | |
122 | Double_t &phi, | |
123 | Double_t b=-1.); | |
124 | void GetLengthsBackToBack(Double_t& ell1,Double_t& ell2, | |
125 | Double_t b=-1.); | |
126 | void GetLengthsForPythia(Int_t n,Double_t* const phi,Double_t* ell, | |
127 | Double_t b=-1.); | |
128 | void PlotBDistr(Int_t n=1000); | |
129 | void PlotLengthDistr(Int_t n=1000,Bool_t save=kFALSE, | |
130 | const char *fname="length.root"); | |
131 | void PlotLengthB2BDistr(Int_t n=1000,Bool_t save=kFALSE, | |
132 | const char *fname="lengthB2B.root"); | |
133 | void CalculateI0I1(Double_t& integral0,Double_t& integral1, | |
134 | Double_t b=0., | |
135 | Double_t x0=0.,Double_t y0=0.,Double_t phi0=0., | |
136 | Double_t ellCut=20.) const; | |
137 | void GetI0I1AndPhi(Double_t& integral0,Double_t& integral1,Double_t &phi, | |
138 | Double_t ellCut=20.,Double_t b=-1.); | |
139 | void GetI0I1(Double_t& integral0,Double_t& integral1, | |
140 | Double_t ellCut=20.,Double_t b=-1.); | |
141 | void GetI0I1BackToBackAndPhi(Double_t& integral01,Double_t& integral11, | |
142 | Double_t& integral02,Double_t& integral12, | |
143 | Double_t& phi, | |
144 | Double_t ellCut=20.,Double_t b=-1.); | |
145 | void GetI0I1BackToBackAndPhiAndXY(Double_t& integral01,Double_t& integral11, | |
146 | Double_t& integral02,Double_t& integral12, | |
147 | Double_t& phi,Double_t& x,Double_t&y, | |
148 | Double_t ellCut=20.,Double_t b=-1.); | |
149 | void GetI0I1BackToBack(Double_t& integral01,Double_t& integral11, | |
150 | Double_t& integral02,Double_t& integral12, | |
151 | Double_t ellCut=20.,Double_t b=-1.); | |
152 | void GetI0I1ForPythia(Int_t n,Double_t* phi, | |
153 | Double_t* integral0,Double_t* integral1, | |
154 | Double_t ellCut=20.,Double_t b=-1.); | |
155 | void GetI0I1ForPythiaAndXY(Int_t n,Double_t* phi, | |
156 | Double_t* integral0,Double_t* integral1, | |
157 | Double_t&x, Double_t &y, | |
158 | Double_t ellCut=20.,Double_t b=-1.); | |
159 | void PlotI0I1Distr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, | |
160 | const char *fname="i0i1.root"); | |
161 | void PlotI0I1B2BDistr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, | |
162 | const char *fname="i0i1B2B.root"); | |
163 | void PlotAlmonds() const; | |
164 | // Copy | |
165 | AliFastGlauber& operator=(const AliFastGlauber & rhs); | |
166 | void Copy(TObject&) const; | |
167 | protected: | |
168 | static Double_t RWSb (const Double_t *xx, const Double_t *par); | |
169 | static Double_t WSb (const Double_t *xx, const Double_t *par); | |
170 | static Double_t WSbz (const Double_t *xx, const Double_t *par); | |
171 | static Double_t WSz (const Double_t *xx, const Double_t *par); | |
172 | static Double_t WSta (const Double_t *xx, const Double_t *par); | |
173 | static Double_t WStarfi (const Double_t *xx, const Double_t *par); | |
174 | static Double_t WStaa (const Double_t *xx, const Double_t *par); | |
175 | static Double_t WKParticipants (const Double_t *xx, const Double_t *par); | |
176 | static Double_t WParticipants (const Double_t *xx, const Double_t *par); | |
177 | static Double_t WSgeo (const Double_t *xx, const Double_t *par); | |
178 | static Double_t WSbinary (const Double_t *xx, const Double_t *par); | |
179 | static Double_t WSN (const Double_t *xx, const Double_t *par); | |
180 | static Double_t WAlmond (const Double_t *xx, const Double_t *par); | |
181 | static Double_t WPathLength0 (const Double_t *xx, const Double_t *par); | |
182 | static Double_t WPathLength (const Double_t *xx, const Double_t *par); | |
183 | static Double_t WIntRadius (const Double_t *xx, const Double_t *par); | |
184 | static Double_t WEnergyDensity (const Double_t *xx, const Double_t *par); | |
185 | ||
186 | void Reset() const; | |
187 | private: | |
188 | AliFastGlauber(); | |
189 | AliFastGlauber(const AliFastGlauber& glauber); | |
190 | ||
191 | static Float_t fgBMax; // Maximum Impact Parameter | |
192 | static const Int_t fgkMCInts; // Number of MC integrations | |
193 | static AliFastGlauber* fgGlauber; // Singleton instance | |
194 | ||
195 | ||
196 | static TF1* fgWSb; // Wood-Saxon Function (b) | |
197 | static TF1* fgRWSb; // Wood-Saxon Function (b) with phase space factor | |
198 | static TF2* fgWSbz; // Wood-Saxon Function (b, z) | |
199 | static TF1* fgWSz; // Wood-Saxon Function (b = b0, z) | |
200 | static TF1* fgWSta; // Thickness Function | |
201 | static TF2* fgWStarfi; // Kernel for Overlap Function | |
202 | static TF2* fgWKParticipants; // Kernel for number of participants | |
203 | static TF1* fgWParticipants; // Number of participants | |
204 | static TF1* fgWStaa; // Overlap Function | |
205 | static TF2* fgWAlmond; // Interaction Almond | |
206 | static TF1* fgWPathLength0; // Path Length as a function of phi | |
207 | static TF1* fgWPathLength; // Path Length as a function of phi | |
208 | static TF1* fgWIntRadius; // Interaction Radius | |
209 | static TF1* fgWSgeo; // dSigma/db geometric | |
210 | static TF1* fgWSbinary; // dSigma/db binary | |
211 | static TF1* fgWSN; // dN/db binary | |
212 | static TF1* fgWEnergyDensity; // Energy density as a function of impact parameter | |
213 | static TF2* fgWAlmondFixedB[40]; // Interaction Almonds read from file | |
214 | static TF2* fgWAlmondCurrent; // Interaction Almond used for length | |
215 | ||
216 | Float_t fWSr0; // Wood-Saxon Parameter r0 | |
217 | Float_t fWSd; // Wood-Saxon Parameter d | |
218 | Float_t fWSw; // Wood-Saxon Parameter w | |
219 | Float_t fWSn; // Wood-Saxon Parameter n | |
220 | // (chosen such that integral is one) | |
221 | Float_t fSigmaHard; // Hard Cross Section [mbarn] | |
222 | Float_t fSigmaNN; // NN Cross Section [mbarn] | |
223 | Int_t fA; // Nucleon number of nucleus A | |
224 | ||
225 | Float_t fBmin; // Minimum b (set through centrality selection) | |
226 | Float_t fBmax; // Coresponding maximum b | |
227 | Double_t fXY[2]; // Current generated production point | |
228 | Double_t fI0I1[2]; // Current integrals I0 and I1 | |
229 | Int_t fEllDef; // definition of length (see CalculateLength()) | |
230 | TString fName; // filename of stored distributions | |
231 | ClassDef(AliFastGlauber,2) // Event geometry simulation in the Glauber Model | |
232 | }; | |
233 | ||
234 | #endif |