Line data Source code
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 0 : {fWSr0 = r0; fWSd = d; fWSw = w; fWSn = n;}
27 : void SetWoodSaxonParametersAu()
28 0 : {fWSr0 = 6.38; fWSd = 0.535; fWSw = 0.; fWSn = 8.59e-4;}
29 : void SetWoodSaxonParametersPb()
30 0 : {fWSr0 = 6.78; fWSd = 0.54; fWSw = 0.; fWSn = 7.14e-4;}
31 0 : void SetMaxImpact(Float_t bmax = 20.) {fgBMax = bmax;};
32 0 : void SetHardCrossSection(Float_t xs = 1.0) {fSigmaHard = xs;}
33 0 : void SetNNCrossSection (Float_t xs = 55.6) {fSigmaNN = xs;}
34 0 : void SetNucleus(Int_t n=208) {fA=n;}
35 : void SetAuAuRhic();
36 : void SetPbPbLHC();
37 0 : void SetFileName(const TString &fn){fName=fn;}
38 0 : void SetFileName(const char *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;}
39 :
40 0 : const TF1* GetWSB() const {return fgWSb;}
41 0 : const TF1* GetRWSB() const {return fgRWSb;}
42 0 : const TF2* GetWSbz() const {return fgWSbz;}
43 0 : const TF1* GetWSz() const {return fgWSz;}
44 0 : const TF1* GetWSta() const {return fgWSta;}
45 0 : const TF2* Kernel() const {return fgWStarfi;}
46 0 : const TF2* GetWStarfi() const {return fgWStarfi;}
47 0 : const TF2* GetWKParticipants() const {return fgWKParticipants;}
48 0 : const TF1* GetWParticipants() const {return fgWParticipants;}
49 0 : const TF1* Overlap() const {return fgWStaa;}
50 0 : const TF1* GetWStaa() const {return fgWStaa;}
51 0 : const TF2* GetWAlmond() const {return fgWAlmond;}
52 0 : const TF1* GetWPathLength0() const {return fgWPathLength0;}
53 0 : const TF1* GetWPathLength() const {return fgWPathLength;}
54 0 : const TF1* GetWIntRadius() const {return fgWIntRadius;}
55 0 : const TF1* GetWSgeo() const {return fgWSgeo;}
56 0 : const TF1* GetWSbinary() const {return fgWSbinary;}
57 0 : const TF1* GetWSN() const {return fgWSN;}
58 0 : const TF1* GetWEnergyDensity() const {return fgWEnergyDensity;}
59 0 : const TF2* GetWAlmondFixedB(Int_t i) const {return fgWAlmondFixedB[i];}
60 :
61 0 : Float_t GetWr0() const {return fWSr0;}
62 0 : Float_t GetWSd() const {return fWSd;}
63 0 : Float_t GetWSw() const {return fWSw;}
64 0 : Float_t GetWSn() const {return fWSn;}
65 0 : Float_t GetSigmaHard() const {return fSigmaHard;}
66 0 : Float_t GetSigmaNN() const {return fSigmaNN;}
67 0 : Int_t GetA() const {return fA;}
68 0 : const TString* GetFileName() const {return &fName;}
69 0 : Float_t GetBmin() const {return fBmin;}
70 0 : 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 0 : void SetLengthDefinition(Int_t def=1) {fEllDef=def;}
107 0 : 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 0 : void GetSavedXY(Double_t xy[2]) const {xy[0] = fXY[0]; xy[1] = fXY[1];}
112 0 : void GetSavedI0I1(Double_t i0i1[2]) const {i0i1[0] = fI0I1[0]; i0i1[1] = fI0I1[1];}
113 0 : void SaveXY(Double_t x, Double_t y) {fXY[0] = x; fXY[1] = y;}
114 0 : 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 12 : ClassDef(AliFastGlauber,2) // Event geometry simulation in the Glauber Model
232 : };
233 :
234 : #endif
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