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5b3a5a5d | 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 | /* $Id$ */ | |
a42548b0 | 7 | |
041f7f97 | 8 | // Utility class to make simple Glauber type calculations for collision geometries: |
9 | // Impact parameter, production points, reaction plane dependence | |
a42548b0 | 10 | // Author: Andreas Morsch |
11 | // andreas.morsch@cern.ch | |
5b3a5a5d | 12 | |
13 | #include <TObject.h> | |
65aa45f2 | 14 | #include <TString.h> |
5b3a5a5d | 15 | class TF1; |
a42548b0 | 16 | class TF2; |
17 | ||
5b3a5a5d | 18 | |
19 | class AliFastGlauber : public TObject { | |
20 | public: | |
18b7a4a1 | 21 | static AliFastGlauber* Instance(); |
65aa45f2 | 22 | virtual ~AliFastGlauber(); |
23 | void Init(Int_t mode = 0); | |
24 | ||
5b3a5a5d | 25 | void SetWoodSaxonParameters(Double_t r0, Double_t d, Double_t w, Double_t n) |
26 | {fWSr0 = r0; fWSd = d; fWSw = w; fWSn = n;} | |
65aa45f2 | 27 | void SetWoodSaxonParametersAu() |
28 | {fWSr0 = 6.38; fWSd = 0.535; fWSw = 0.; fWSn = 8.59e-4;} | |
29 | void SetWoodSaxonParametersPb() | |
a42548b0 | 30 | {fWSr0 = 6.78; fWSd = 0.54; fWSw = 0.; fWSn = 7.14e-4;} |
041f7f97 | 31 | void SetMaxImpact(Float_t bmax = 20.) {fgBMax = bmax;}; |
65aa45f2 | 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(); | |
620294e8 | 37 | void SetFileName(const TString &fn){fName=fn;} |
d3d4a92f | 38 | void SetFileName(const char *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;} |
a2f2f511 | 39 | |
65aa45f2 | 40 | const TF1* GetWSB() const {return fgWSb;} |
882b3108 | 41 | const TF1* GetRWSB() const {return fgRWSb;} |
65aa45f2 | 42 | const TF2* GetWSbz() const {return fgWSbz;} |
43 | const TF1* GetWSz() const {return fgWSz;} | |
44 | const TF1* GetWSta() const {return fgWSta;} | |
710a8d90 | 45 | const TF2* Kernel() const {return fgWStarfi;} |
65aa45f2 | 46 | const TF2* GetWStarfi() const {return fgWStarfi;} |
47 | const TF2* GetWKParticipants() const {return fgWKParticipants;} | |
48 | const TF1* GetWParticipants() const {return fgWParticipants;} | |
710a8d90 | 49 | const TF1* Overlap() const {return fgWStaa;} |
65aa45f2 | 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;} | |
7f2f270b | 59 | const TF2* GetWAlmondFixedB(Int_t i) const {return fgWAlmondFixedB[i];} |
f3a04204 | 60 | |
710a8d90 | 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;} | |
710a8d90 | 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; | |
f3a04204 | 85 | |
710a8d90 | 86 | Double_t CrossSection(Double_t b1, Double_t b2) const; |
87 | Double_t HardCrossSection(Double_t b1, Double_t b2) const; | |
f762082f | 88 | Double_t NHard(Double_t b1, Double_t b2) const; |
710a8d90 | 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; | |
148c5ce5 | 95 | Double_t GetNumberOfCollisionsPerEvent(Double_t b) const; |
a42548b0 | 96 | Double_t MeanOverlap(Double_t b1, Double_t b2); |
97 | Double_t MeanNumberOfCollisionsPerEvent(Double_t b1, Double_t b2); | |
5b3a5a5d | 98 | void SimulateTrigger(Int_t n); |
99 | void GetRandom(Float_t& b, Float_t& p, Float_t& mult); | |
c2140715 | 100 | void GetRandom(Int_t& bin, Bool_t& hard); |
65aa45f2 | 101 | Double_t GetRandomImpactParameter(Double_t bmin, Double_t bmax); |
65aa45f2 | 102 | |
710a8d90 | 103 | void StoreFunctions() const; |
104 | void StoreAlmonds() const; | |
105 | ||
65aa45f2 | 106 | void SetLengthDefinition(Int_t def=1) {fEllDef=def;} |
e9663638 | 107 | Int_t GetLengthDef() const {return fEllDef;} |
65aa45f2 | 108 | void SetCentralityClass(Double_t xsecFrLow=0.0,Double_t xsecFrUp=0.1); |
a2f2f511 | 109 | void GetRandomBHard(Double_t& b); |
110 | void GetRandomXY(Double_t& x,Double_t& y); | |
620294e8 | 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];} | |
462421a4 | 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 | ||
a2f2f511 | 116 | void GetRandomPhi(Double_t& phi); |
117 | Double_t CalculateLength(Double_t b=0.,Double_t x0=0.,Double_t y0=0., | |
710a8d90 | 118 | Double_t phi0=0.); |
83f67d08 | 119 | void GetLengthAndPhi(Double_t& ell,Double_t &phi,Double_t b=-1.); |
a2f2f511 | 120 | void GetLength(Double_t& ell,Double_t b=-1.); |
83f67d08 | 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.); | |
620294e8 | 126 | void GetLengthsForPythia(Int_t n,Double_t* const phi,Double_t* ell, |
a2f2f511 | 127 | Double_t b=-1.); |
128 | void PlotBDistr(Int_t n=1000); | |
129 | void PlotLengthDistr(Int_t n=1000,Bool_t save=kFALSE, | |
d3d4a92f | 130 | const char *fname="length.root"); |
a2f2f511 | 131 | void PlotLengthB2BDistr(Int_t n=1000,Bool_t save=kFALSE, |
d3d4a92f | 132 | const char *fname="lengthB2B.root"); |
65aa45f2 | 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., | |
710a8d90 | 136 | Double_t ellCut=20.) const; |
83f67d08 | 137 | void GetI0I1AndPhi(Double_t& integral0,Double_t& integral1,Double_t &phi, |
138 | Double_t ellCut=20.,Double_t b=-1.); | |
65aa45f2 | 139 | void GetI0I1(Double_t& integral0,Double_t& integral1, |
140 | Double_t ellCut=20.,Double_t b=-1.); | |
83f67d08 | 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.); | |
c54404bf | 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.); | |
65aa45f2 | 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.); | |
2e3b5c95 | 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.); | |
65aa45f2 | 159 | void PlotI0I1Distr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, |
d3d4a92f | 160 | const char *fname="i0i1.root"); |
65aa45f2 | 161 | void PlotI0I1B2BDistr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, |
d3d4a92f | 162 | const char *fname="i0i1B2B.root"); |
710a8d90 | 163 | void PlotAlmonds() const; |
a42548b0 | 164 | // Copy |
165 | AliFastGlauber& operator=(const AliFastGlauber & rhs); | |
166 | void Copy(TObject&) const; | |
5b3a5a5d | 167 | protected: |
882b3108 | 168 | static Double_t RWSb (const Double_t *xx, const Double_t *par); |
0c13ae32 | 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); | |
fac5662b | 185 | |
a42548b0 | 186 | void Reset() const; |
18b7a4a1 | 187 | private: |
188 | AliFastGlauber(); | |
189 | AliFastGlauber(const AliFastGlauber& glauber); | |
65aa45f2 | 190 | |
18b7a4a1 | 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 | ||
041f7f97 | 196 | static TF1* fgWSb; // Wood-Saxon Function (b) |
882b3108 | 197 | static TF1* fgRWSb; // Wood-Saxon Function (b) with phase space factor |
041f7f97 | 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 | |
1bc228f5 | 202 | static TF2* fgWKParticipants; // Kernel for number of participants |
203 | static TF1* fgWParticipants; // Number of participants | |
041f7f97 | 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 | |
7f2f270b | 213 | static TF2* fgWAlmondFixedB[40]; // Interaction Almonds read from file |
65aa45f2 | 214 | static TF2* fgWAlmondCurrent; // Interaction Almond used for length |
5b3a5a5d | 215 | |
65aa45f2 | 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 | |
a2f2f511 | 224 | |
710a8d90 | 225 | Float_t fBmin; // Minimum b (set through centrality selection) |
226 | Float_t fBmax; // Coresponding maximum b | |
462421a4 | 227 | Double_t fXY[2]; // Current generated production point |
228 | Double_t fI0I1[2]; // Current integrals I0 and I1 | |
65aa45f2 | 229 | Int_t fEllDef; // definition of length (see CalculateLength()) |
5373d3f7 | 230 | TString fName; // filename of stored distributions |
7f2f270b | 231 | ClassDef(AliFastGlauber,2) // Event geometry simulation in the Glauber Model |
5b3a5a5d | 232 | }; |
233 | ||
234 | #endif |