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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 | /* $Id$ */ | |
041f7f97 | 7 | // |
8 | // Utility class to make simple Glauber type calculations for collision geometries: | |
9 | // Impact parameter, production points, reaction plane dependence | |
10 | // | |
11 | // Author: andreas.morsch@cern.ch | |
5b3a5a5d | 12 | |
13 | #include <TObject.h> | |
65aa45f2 | 14 | #include <TString.h> |
a2f2f511 | 15 | #include <TF2.h> |
5b3a5a5d | 16 | class TF1; |
5b3a5a5d | 17 | |
18 | class AliFastGlauber : public TObject { | |
19 | public: | |
20 | AliFastGlauber(); | |
65aa45f2 | 21 | virtual ~AliFastGlauber(); |
22 | void Init(Int_t mode = 0); | |
23 | ||
5b3a5a5d | 24 | void SetWoodSaxonParameters(Double_t r0, Double_t d, Double_t w, Double_t n) |
25 | {fWSr0 = r0; fWSd = d; fWSw = w; fWSn = n;} | |
65aa45f2 | 26 | void SetWoodSaxonParametersAu() |
27 | {fWSr0 = 6.38; fWSd = 0.535; fWSw = 0.; fWSn = 8.59e-4;} | |
28 | void SetWoodSaxonParametersPb() | |
29 | {fWSr0 = 6.624; fWSd = 0.549; fWSw = 0.; fWSn = 7.69e-4;} | |
041f7f97 | 30 | void SetMaxImpact(Float_t bmax = 20.) {fgBMax = bmax;}; |
65aa45f2 | 31 | void SetHardCrossSection(Float_t xs = 1.0) {fSigmaHard = xs;} |
32 | void SetNNCrossSection (Float_t xs = 55.6) {fSigmaNN = xs;} | |
33 | void SetNucleus(Int_t n=208) {fA=n;} | |
34 | void SetAuAuRhic(); | |
35 | void SetPbPbLHC(); | |
36 | void SetFileName(TString &fn){fName=fn;} | |
d3d4a92f | 37 | void SetFileName(const char *fn="$(ALICE_ROOT)/FASTSIM/data/glauberPbPb.root"){fName=fn;} |
a2f2f511 | 38 | |
2a103154 | 39 | static Double_t WSb (Double_t *xx, Double_t *par); |
40 | static Double_t WSbz (Double_t *xx, Double_t *par); | |
41 | static Double_t WSz (Double_t *xx, Double_t *par); | |
42 | static Double_t WSta (Double_t *xx, Double_t *par); | |
43 | static Double_t WStarfi (Double_t *xx, Double_t *par); | |
65aa45f2 | 44 | static Double_t WStaa (Double_t *xx, Double_t *par); |
1bc228f5 | 45 | static Double_t WKParticipants (Double_t *xx, Double_t *par); |
46 | static Double_t WParticipants (Double_t *xx, Double_t *par); | |
2a103154 | 47 | static Double_t WSgeo (Double_t *xx, Double_t *par); |
48 | static Double_t WSbinary (Double_t *xx, Double_t *par); | |
49 | static Double_t WSN (Double_t *xx, Double_t *par); | |
50 | static Double_t WAlmond (Double_t *xx, Double_t *par); | |
51 | static Double_t WPathLength0 (Double_t *xx, Double_t *par); | |
52 | static Double_t WPathLength (Double_t *xx, Double_t *par); | |
53 | static Double_t WIntRadius (Double_t *xx, Double_t *par); | |
54 | static Double_t WEnergyDensity (Double_t *xx, Double_t *par); | |
65aa45f2 | 55 | |
65aa45f2 | 56 | const TF1* GetWSB() const {return fgWSb;} |
57 | const TF2* GetWSbz() const {return fgWSbz;} | |
58 | const TF1* GetWSz() const {return fgWSz;} | |
59 | const TF1* GetWSta() const {return fgWSta;} | |
710a8d90 | 60 | const TF2* Kernel() const {return fgWStarfi;} |
65aa45f2 | 61 | const TF2* GetWStarfi() const {return fgWStarfi;} |
62 | const TF2* GetWKParticipants() const {return fgWKParticipants;} | |
63 | const TF1* GetWParticipants() const {return fgWParticipants;} | |
710a8d90 | 64 | const TF1* Overlap() const {return fgWStaa;} |
65aa45f2 | 65 | const TF1* GetWStaa() const {return fgWStaa;} |
66 | const TF2* GetWAlmond() const {return fgWAlmond;} | |
67 | const TF1* GetWPathLength0() const {return fgWPathLength0;} | |
68 | const TF1* GetWPathLength() const {return fgWPathLength;} | |
69 | const TF1* GetWIntRadius() const {return fgWIntRadius;} | |
70 | const TF1* GetWSgeo() const {return fgWSgeo;} | |
71 | const TF1* GetWSbinary() const {return fgWSbinary;} | |
72 | const TF1* GetWSN() const {return fgWSN;} | |
73 | const TF1* GetWEnergyDensity() const {return fgWEnergyDensity;} | |
74 | const TF2* GetWAlmondFixedB(Int_t i) const {return &fgWAlmondFixedB[i];} | |
f3a04204 | 75 | |
710a8d90 | 76 | Float_t GetWr0() const {return fWSr0;} |
77 | Float_t GetWSd() const {return fWSd;} | |
78 | Float_t GetWSw() const {return fWSw;} | |
79 | Float_t GetWSn() const {return fWSn;} | |
80 | Float_t GetSigmaHard() const {return fSigmaHard;} | |
81 | Float_t GetSigmaNN() const {return fSigmaNN;} | |
82 | Int_t GetA() const {return fA;} | |
710a8d90 | 83 | const TString* GetFileName() const {return &fName;} |
84 | Float_t GetBmin() const {return fBmin;} | |
85 | Float_t GetBmax() const {return fBmax;} | |
86 | ||
87 | void DrawWSb() const; | |
88 | void DrawThickness() const; | |
89 | void DrawOverlap() const; | |
90 | void DrawParticipants() const; | |
91 | void DrawGeo() const; | |
92 | void DrawBinary() const; | |
93 | void DrawN() const; | |
94 | void DrawKernel(Double_t b = 0.) const; | |
95 | void DrawAlmond(Double_t b = 0.) const; | |
96 | void DrawPathLength0(Double_t b = 0., Int_t iopt = 0) const; | |
97 | void DrawPathLength(Double_t b, Int_t ni = 1000, Int_t iopt = 0) const; | |
98 | void DrawIntRadius(Double_t b = 0.) const; | |
99 | void DrawEnergyDensity() const; | |
f3a04204 | 100 | |
710a8d90 | 101 | Double_t CrossSection(Double_t b1, Double_t b2) const; |
102 | Double_t HardCrossSection(Double_t b1, Double_t b2) const; | |
f762082f | 103 | Double_t NHard(Double_t b1, Double_t b2) const; |
710a8d90 | 104 | Double_t FractionOfHardCrossSection(Double_t b1, Double_t b2) const; |
105 | Double_t Binaries(Double_t b) const; | |
106 | Double_t GetNumberOfBinaries(Double_t b) const; | |
107 | Double_t Participants(Double_t b) const; | |
108 | Double_t GetNumberOfParticipants(Double_t b) const; | |
109 | Double_t GetNumberOfCollisions(Double_t b) const; | |
148c5ce5 | 110 | Double_t GetNumberOfCollisionsPerEvent(Double_t b) const; |
5b3a5a5d | 111 | void SimulateTrigger(Int_t n); |
112 | void GetRandom(Float_t& b, Float_t& p, Float_t& mult); | |
c2140715 | 113 | void GetRandom(Int_t& bin, Bool_t& hard); |
65aa45f2 | 114 | Double_t GetRandomImpactParameter(Double_t bmin, Double_t bmax); |
65aa45f2 | 115 | |
710a8d90 | 116 | void StoreFunctions() const; |
117 | void StoreAlmonds() const; | |
118 | ||
65aa45f2 | 119 | void SetLengthDefinition(Int_t def=1) {fEllDef=def;} |
e9663638 | 120 | Int_t GetLengthDef() const {return fEllDef;} |
65aa45f2 | 121 | void SetCentralityClass(Double_t xsecFrLow=0.0,Double_t xsecFrUp=0.1); |
a2f2f511 | 122 | void GetRandomBHard(Double_t& b); |
123 | void GetRandomXY(Double_t& x,Double_t& y); | |
124 | void GetRandomPhi(Double_t& phi); | |
125 | Double_t CalculateLength(Double_t b=0.,Double_t x0=0.,Double_t y0=0., | |
710a8d90 | 126 | Double_t phi0=0.); |
83f67d08 | 127 | void GetLengthAndPhi(Double_t& ell,Double_t &phi,Double_t b=-1.); |
a2f2f511 | 128 | void GetLength(Double_t& ell,Double_t b=-1.); |
83f67d08 | 129 | void GetLengthsBackToBackAndPhi(Double_t& ell1,Double_t& ell2, |
130 | Double_t &phi, | |
131 | Double_t b=-1.); | |
132 | void GetLengthsBackToBack(Double_t& ell1,Double_t& ell2, | |
133 | Double_t b=-1.); | |
a2f2f511 | 134 | void GetLengthsForPythia(Int_t n,Double_t* phi,Double_t* ell, |
135 | Double_t b=-1.); | |
136 | void PlotBDistr(Int_t n=1000); | |
137 | void PlotLengthDistr(Int_t n=1000,Bool_t save=kFALSE, | |
d3d4a92f | 138 | const char *fname="length.root"); |
a2f2f511 | 139 | void PlotLengthB2BDistr(Int_t n=1000,Bool_t save=kFALSE, |
d3d4a92f | 140 | const char *fname="lengthB2B.root"); |
65aa45f2 | 141 | void CalculateI0I1(Double_t& integral0,Double_t& integral1, |
142 | Double_t b=0., | |
143 | Double_t x0=0.,Double_t y0=0.,Double_t phi0=0., | |
710a8d90 | 144 | Double_t ellCut=20.) const; |
83f67d08 | 145 | void GetI0I1AndPhi(Double_t& integral0,Double_t& integral1,Double_t &phi, |
146 | Double_t ellCut=20.,Double_t b=-1.); | |
65aa45f2 | 147 | void GetI0I1(Double_t& integral0,Double_t& integral1, |
148 | Double_t ellCut=20.,Double_t b=-1.); | |
83f67d08 | 149 | void GetI0I1BackToBackAndPhi(Double_t& integral01,Double_t& integral11, |
150 | Double_t& integral02,Double_t& integral12, | |
151 | Double_t& phi, | |
152 | Double_t ellCut=20.,Double_t b=-1.); | |
c54404bf | 153 | void GetI0I1BackToBackAndPhiAndXY(Double_t& integral01,Double_t& integral11, |
154 | Double_t& integral02,Double_t& integral12, | |
155 | Double_t& phi,Double_t& x,Double_t&y, | |
156 | Double_t ellCut=20.,Double_t b=-1.); | |
65aa45f2 | 157 | void GetI0I1BackToBack(Double_t& integral01,Double_t& integral11, |
158 | Double_t& integral02,Double_t& integral12, | |
159 | Double_t ellCut=20.,Double_t b=-1.); | |
160 | void GetI0I1ForPythia(Int_t n,Double_t* phi, | |
161 | Double_t* integral0,Double_t* integral1, | |
162 | Double_t ellCut=20.,Double_t b=-1.); | |
2e3b5c95 | 163 | void GetI0I1ForPythiaAndXY(Int_t n,Double_t* phi, |
164 | Double_t* integral0,Double_t* integral1, | |
165 | Double_t&x, Double_t &y, | |
166 | Double_t ellCut=20.,Double_t b=-1.); | |
65aa45f2 | 167 | void PlotI0I1Distr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, |
d3d4a92f | 168 | const char *fname="i0i1.root"); |
65aa45f2 | 169 | void PlotI0I1B2BDistr(Int_t n=1000,Double_t ellCut=20.,Bool_t save=kFALSE, |
d3d4a92f | 170 | const char *fname="i0i1B2B.root"); |
710a8d90 | 171 | void PlotAlmonds() const; |
5b3a5a5d | 172 | protected: |
65aa45f2 | 173 | void Reset(); |
174 | ||
bbf8513d | 175 | static Float_t fgBMax; // Maximum Impact Parameter |
176 | static Int_t fgCounter; // Counter to protect double instantiation | |
177 | static const Int_t fgkMCInts; // Number of MC integrations | |
65aa45f2 | 178 | |
041f7f97 | 179 | static TF1* fgWSb; // Wood-Saxon Function (b) |
180 | static TF2* fgWSbz; // Wood-Saxon Function (b, z) | |
181 | static TF1* fgWSz; // Wood-Saxon Function (b = b0, z) | |
182 | static TF1* fgWSta; // Thickness Function | |
183 | static TF2* fgWStarfi; // Kernel for Overlap Function | |
1bc228f5 | 184 | static TF2* fgWKParticipants; // Kernel for number of participants |
185 | static TF1* fgWParticipants; // Number of participants | |
041f7f97 | 186 | static TF1* fgWStaa; // Overlap Function |
187 | static TF2* fgWAlmond; // Interaction Almond | |
188 | static TF1* fgWPathLength0; // Path Length as a function of phi | |
189 | static TF1* fgWPathLength; // Path Length as a function of phi | |
190 | static TF1* fgWIntRadius; // Interaction Radius | |
191 | static TF1* fgWSgeo; // dSigma/db geometric | |
192 | static TF1* fgWSbinary; // dSigma/db binary | |
193 | static TF1* fgWSN; // dN/db binary | |
194 | static TF1* fgWEnergyDensity; // Energy density as a function of impact parameter | |
65aa45f2 | 195 | static TF2 fgWAlmondFixedB[40]; // Interaction Almonds read from file |
196 | static TF2* fgWAlmondCurrent; // Interaction Almond used for length | |
5b3a5a5d | 197 | |
65aa45f2 | 198 | Float_t fWSr0; // Wood-Saxon Parameter r0 |
199 | Float_t fWSd; // Wood-Saxon Parameter d | |
200 | Float_t fWSw; // Wood-Saxon Parameter w | |
201 | Float_t fWSn; // Wood-Saxon Parameter n | |
202 | // (chosen such that integral is one) | |
203 | Float_t fSigmaHard; // Hard Cross Section [mbarn] | |
204 | Float_t fSigmaNN; // NN Cross Section [mbarn] | |
205 | Int_t fA; // Nucleon number of nucleus A | |
a2f2f511 | 206 | |
710a8d90 | 207 | Float_t fBmin; // Minimum b (set through centrality selection) |
208 | Float_t fBmax; // Coresponding maximum b | |
209 | ||
65aa45f2 | 210 | Int_t fEllDef; // definition of length (see CalculateLength()) |
211 | TString fName; // filename of stored distributions | |
5b3a5a5d | 212 | ClassDef(AliFastGlauber,1) // Event geometry simulation in the Glauber Model |
213 | }; | |
214 | ||
215 | #endif |