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5b3a5a5d | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
88cb7938 | 16 | /* $Id$ */ |
041f7f97 | 17 | // |
65aa45f2 | 18 | // Utility class to make simple Glauber type calculations |
a42548b0 | 19 | // for SYMMETRIC collision geometries (AA): |
041f7f97 | 20 | // Impact parameter, production points, reaction plane dependence |
65aa45f2 | 21 | // |
041f7f97 | 22 | // The SimulateTrigger method can be used for simple MB and hard-process |
23 | // (binary scaling) trigger studies. | |
65aa45f2 | 24 | // |
041f7f97 | 25 | // Some basic quantities can be visualized directly. |
041f7f97 | 26 | // |
65aa45f2 | 27 | // The default set-up for PbPb or AUAu collisions can be read from a file |
28 | // calling Init(1) or Init(2) if you want to read Almonds too. | |
29 | // | |
30 | // ***** If you change settings dont forget to call init afterwards, ***** | |
31 | // ***** in order to update the formulas with the new parameters. ***** | |
041f7f97 | 32 | // |
33 | // Author: andreas.morsch@cern.ch | |
65aa45f2 | 34 | //=================== Added by A. Dainese 11/02/04 =========================== |
35 | // Calculate path length for a parton with production point (x0,y0) | |
36 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
37 | // in a collision with impact parameter b and functions that make use | |
38 | // of it. | |
39 | //=================== Added by A. Dainese 05/03/04 =========================== | |
40 | // Calculation of line integrals I0 and I1 | |
41 | // integral0 = \int_0^ellCut dl*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
42 | // integral1 = \int_0^ellCut dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
43 | // mostly for use in the Quenching class | |
44 | //=================== Added by C. Loizdes 27/03/04 =========================== | |
45 | // Handling of AuAu collisions | |
46 | // More get/set functions | |
47 | // Comments, units and clearing of code | |
48 | // | |
5b3a5a5d | 49 | |
50 | // from AliRoot | |
51 | #include "AliFastGlauber.h" | |
52 | // from root | |
9edefa04 | 53 | #include <TCanvas.h> |
5b3a5a5d | 54 | #include <TF1.h> |
55 | #include <TF2.h> | |
5b3a5a5d | 56 | #include <TFile.h> |
9edefa04 | 57 | #include <TH1F.h> |
58 | #include <TH2F.h> | |
59 | #include <TLegend.h> | |
60 | #include <TMath.h> | |
9edefa04 | 61 | #include <TRandom.h> |
62 | #include <TStyle.h> | |
5b3a5a5d | 63 | |
64 | ClassImp(AliFastGlauber) | |
65 | ||
65aa45f2 | 66 | Float_t AliFastGlauber::fgBMax = 0.; |
041f7f97 | 67 | TF1* AliFastGlauber::fgWSb = NULL; |
882b3108 | 68 | TF1* AliFastGlauber::fgRWSb = NULL; |
041f7f97 | 69 | TF2* AliFastGlauber::fgWSbz = NULL; |
70 | TF1* AliFastGlauber::fgWSz = NULL; | |
71 | TF1* AliFastGlauber::fgWSta = NULL; | |
72 | TF2* AliFastGlauber::fgWStarfi = NULL; | |
73 | TF2* AliFastGlauber::fgWAlmond = NULL; | |
74 | TF1* AliFastGlauber::fgWStaa = NULL; | |
75 | TF1* AliFastGlauber::fgWSgeo = NULL; | |
76 | TF1* AliFastGlauber::fgWSbinary = NULL; | |
77 | TF1* AliFastGlauber::fgWSN = NULL; | |
78 | TF1* AliFastGlauber::fgWPathLength0 = NULL; | |
79 | TF1* AliFastGlauber::fgWPathLength = NULL; | |
80 | TF1* AliFastGlauber::fgWEnergyDensity = NULL; | |
81 | TF1* AliFastGlauber::fgWIntRadius = NULL; | |
1bc228f5 | 82 | TF2* AliFastGlauber::fgWKParticipants = NULL; |
83 | TF1* AliFastGlauber::fgWParticipants = NULL; | |
65aa45f2 | 84 | TF2* AliFastGlauber::fgWAlmondCurrent = NULL; |
7f2f270b | 85 | TF2* AliFastGlauber::fgWAlmondFixedB[40]; |
65aa45f2 | 86 | const Int_t AliFastGlauber::fgkMCInts = 100000; |
18b7a4a1 | 87 | AliFastGlauber* AliFastGlauber::fgGlauber = NULL; |
88 | ||
5b3a5a5d | 89 | |
e6e76983 | 90 | AliFastGlauber::AliFastGlauber(): |
91 | fWSr0(0.), | |
92 | fWSd(0.), | |
93 | fWSw(0.), | |
94 | fWSn(0.), | |
95 | fSigmaHard(0.), | |
96 | fSigmaNN(0.), | |
97 | fA(0), | |
98 | fBmin(0.), | |
99 | fBmax(0.), | |
100 | fEllDef(0), | |
101 | fName() | |
5b3a5a5d | 102 | { |
a42548b0 | 103 | // Default Constructor |
65aa45f2 | 104 | // Defaults for Pb |
105 | SetMaxImpact(); | |
106 | SetLengthDefinition(); | |
107 | SetPbPbLHC(); | |
5373d3f7 | 108 | fXY[0] = fXY[1] = 0; |
462421a4 | 109 | fI0I1[0] = fI0I1[1] = 0; |
65aa45f2 | 110 | } |
111 | ||
a42548b0 | 112 | AliFastGlauber::AliFastGlauber(const AliFastGlauber & gl) |
e6e76983 | 113 | :TObject(gl), |
114 | fWSr0(0.), | |
115 | fWSd(0.), | |
116 | fWSw(0.), | |
117 | fWSn(0.), | |
118 | fSigmaHard(0.), | |
119 | fSigmaNN(0.), | |
120 | fA(0), | |
121 | fBmin(0.), | |
122 | fBmax(0.), | |
123 | fEllDef(0), | |
124 | fName() | |
a42548b0 | 125 | { |
126 | // Copy constructor | |
127 | gl.Copy(*this); | |
5373d3f7 | 128 | fXY[0] = fXY[1] = 0; |
462421a4 | 129 | fI0I1[0] = fI0I1[1] = 0; |
a42548b0 | 130 | } |
131 | ||
18b7a4a1 | 132 | AliFastGlauber* AliFastGlauber::Instance() |
133 | { | |
134 | // Set random number generator | |
135 | if (fgGlauber) { | |
136 | return fgGlauber; | |
137 | } else { | |
138 | fgGlauber = new AliFastGlauber(); | |
139 | return fgGlauber; | |
140 | } | |
141 | } | |
142 | ||
65aa45f2 | 143 | AliFastGlauber::~AliFastGlauber() |
144 | { | |
a42548b0 | 145 | // Destructor |
7f2f270b | 146 | for(Int_t k=0; k<40; k++) delete fgWAlmondFixedB[k]; |
65aa45f2 | 147 | } |
148 | ||
149 | void AliFastGlauber::SetAuAuRhic() | |
150 | { | |
151 | //Set all parameters for RHIC | |
152 | SetWoodSaxonParametersAu(); | |
153 | SetHardCrossSection(); | |
710a8d90 | 154 | SetNNCrossSection(42); |
65aa45f2 | 155 | SetNucleus(197); |
156 | SetFileName("$(ALICE_ROOT)/FASTSIM/data/glauberAuAu.root"); | |
157 | } | |
158 | ||
159 | void AliFastGlauber::SetPbPbLHC() | |
160 | { | |
161 | //Set all parameters for LHC | |
162 | SetWoodSaxonParametersPb(); | |
163 | SetHardCrossSection(); | |
164 | SetNNCrossSection(); | |
165 | SetNucleus(); | |
166 | SetFileName(); | |
5b3a5a5d | 167 | } |
168 | ||
169 | void AliFastGlauber::Init(Int_t mode) | |
170 | { | |
65aa45f2 | 171 | // Initialisation |
172 | // mode = 0; all functions are calculated | |
173 | // mode = 1; overlap function is read from file (for Pb-Pb only) | |
174 | // mode = 2; interaction almond functions are read from file | |
175 | // USE THIS FOR PATH LENGTH CALC.! | |
176 | // | |
a2f2f511 | 177 | |
65aa45f2 | 178 | // |
179 | Reset(); | |
180 | // | |
5b3a5a5d | 181 | |
65aa45f2 | 182 | // |
183 | // Wood-Saxon | |
184 | // | |
185 | fgWSb = new TF1("WSb", WSb, 0, fgBMax, 4); | |
186 | fgWSb->SetParameter(0, fWSr0); | |
187 | fgWSb->SetParameter(1, fWSd); | |
188 | fgWSb->SetParameter(2, fWSw); | |
189 | fgWSb->SetParameter(3, fWSn); | |
190 | ||
882b3108 | 191 | fgRWSb = new TF1("RWSb", RWSb, 0, fgBMax, 4); |
192 | fgRWSb->SetParameter(0, fWSr0); | |
193 | fgRWSb->SetParameter(1, fWSd); | |
194 | fgRWSb->SetParameter(2, fWSw); | |
195 | fgRWSb->SetParameter(3, fWSn); | |
196 | ||
fac5662b | 197 | fgWSbz = new TF2("WSbz", WSbz, 0, fgBMax, 0, fgBMax, 4); |
65aa45f2 | 198 | fgWSbz->SetParameter(0, fWSr0); |
199 | fgWSbz->SetParameter(1, fWSd); | |
200 | fgWSbz->SetParameter(2, fWSw); | |
201 | fgWSbz->SetParameter(3, fWSn); | |
202 | ||
203 | fgWSz = new TF1("WSz", WSz, 0, fgBMax, 5); | |
204 | fgWSz->SetParameter(0, fWSr0); | |
205 | fgWSz->SetParameter(1, fWSd); | |
206 | fgWSz->SetParameter(2, fWSw); | |
207 | fgWSz->SetParameter(3, fWSn); | |
208 | ||
209 | // | |
210 | // Thickness | |
211 | // | |
212 | fgWSta = new TF1("WSta", WSta, 0., fgBMax, 0); | |
5b3a5a5d | 213 | |
65aa45f2 | 214 | // |
215 | // Overlap Kernel | |
216 | // | |
217 | fgWStarfi = new TF2("WStarfi", WStarfi, 0., fgBMax, 0., TMath::Pi(), 1); | |
218 | fgWStarfi->SetParameter(0, 0.); | |
219 | fgWStarfi->SetNpx(200); | |
220 | fgWStarfi->SetNpy(20); | |
8de7e046 | 221 | |
65aa45f2 | 222 | // |
223 | // Participants Kernel | |
224 | // | |
225 | fgWKParticipants = new TF2("WKParticipants", WKParticipants, 0., fgBMax, 0., TMath::Pi(), 3); | |
226 | fgWKParticipants->SetParameter(0, 0.); | |
227 | fgWKParticipants->SetParameter(1, fSigmaNN); | |
228 | fgWKParticipants->SetParameter(2, fA); | |
229 | fgWKParticipants->SetNpx(200); | |
230 | fgWKParticipants->SetNpy(20); | |
f3a04204 | 231 | |
65aa45f2 | 232 | // |
233 | // Overlap and Participants | |
234 | // | |
235 | if (!mode) { | |
236 | fgWStaa = new TF1("WStaa", WStaa, 0., fgBMax, 1); | |
237 | fgWStaa->SetNpx(100); | |
238 | fgWStaa->SetParameter(0,fA); | |
239 | fgWStaa->SetNpx(100); | |
240 | fgWParticipants = new TF1("WParticipants", WParticipants, 0., fgBMax, 2); | |
241 | fgWParticipants->SetParameter(0, fSigmaNN); | |
242 | fgWParticipants->SetParameter(1, fA); | |
243 | fgWParticipants->SetNpx(100); | |
244 | } else { | |
245 | Info("Init","Reading overlap function from file %s",fName.Data()); | |
246 | TFile* f = new TFile(fName.Data()); | |
247 | if(!f->IsOpen()){ | |
248 | Fatal("Init", "Could not open file %s",fName.Data()); | |
249 | } | |
250 | fgWStaa = (TF1*) f->Get("WStaa"); | |
251 | fgWParticipants = (TF1*) f->Get("WParticipants"); | |
252 | delete f; | |
253 | } | |
2a103154 | 254 | |
65aa45f2 | 255 | // |
256 | // Energy Density | |
257 | // | |
258 | fgWEnergyDensity = new TF1("WEnergyDensity", WEnergyDensity, 0., 2. * fWSr0, 1); | |
259 | fgWEnergyDensity->SetParameter(0, fWSr0 + 1.); | |
260 | ||
261 | // | |
262 | // Geometrical Cross-Section | |
263 | // | |
264 | fgWSgeo = new TF1("WSgeo", WSgeo, 0., fgBMax, 1); | |
265 | fgWSgeo->SetParameter(0,fSigmaNN); //mbarn | |
266 | fgWSgeo->SetNpx(100); | |
2a103154 | 267 | |
65aa45f2 | 268 | // |
269 | // Hard cross section (binary collisions) | |
270 | // | |
271 | fgWSbinary = new TF1("WSbinary", WSbinary, 0., fgBMax, 1); | |
272 | fgWSbinary->SetParameter(0, fSigmaHard); //mbarn | |
273 | fgWSbinary->SetNpx(100); | |
1bc228f5 | 274 | |
65aa45f2 | 275 | // |
276 | // Hard collisions per event | |
277 | // | |
882b3108 | 278 | fgWSN = new TF1("WSN", WSN, 0.01, fgBMax, 1); |
65aa45f2 | 279 | fgWSN->SetNpx(100); |
280 | ||
281 | // | |
282 | // Almond shaped interaction region | |
283 | // | |
284 | fgWAlmond = new TF2("WAlmond", WAlmond, -fgBMax, fgBMax, -fgBMax, fgBMax, 1); | |
285 | fgWAlmond->SetParameter(0, 0.); | |
286 | fgWAlmond->SetNpx(200); | |
287 | fgWAlmond->SetNpy(200); | |
288 | ||
289 | if(mode==2) { | |
290 | Info("Init","Reading interaction almonds from file: %s",fName.Data()); | |
291 | Char_t almondName[100]; | |
292 | TFile* ff = new TFile(fName.Data()); | |
293 | for(Int_t k=0; k<40; k++) { | |
bae6da3c | 294 | snprintf(almondName,100, "WAlmondFixedB%d",k); |
65aa45f2 | 295 | fgWAlmondCurrent = (TF2*)ff->Get(almondName); |
7f2f270b | 296 | fgWAlmondFixedB[k] = fgWAlmondCurrent; |
5b3a5a5d | 297 | } |
65aa45f2 | 298 | delete ff; |
299 | } | |
300 | ||
301 | fgWIntRadius = new TF1("WIntRadius", WIntRadius, 0., fgBMax, 1); | |
302 | fgWIntRadius->SetParameter(0, 0.); | |
303 | ||
304 | // | |
305 | // Path Length as a function of Phi | |
306 | // | |
307 | fgWPathLength0 = new TF1("WPathLength0", WPathLength0, -TMath::Pi(), TMath::Pi(), 2); | |
308 | fgWPathLength0->SetParameter(0, 0.); | |
309 | fgWPathLength0->SetParameter(1, 0.); //Pathlength definition | |
310 | ||
311 | fgWPathLength = new TF1("WPathLength", WPathLength, -TMath::Pi(), TMath::Pi(), 3); | |
312 | fgWPathLength->SetParameter(0, 0.); //Impact Parameter | |
313 | fgWPathLength->SetParameter(1, 1000.); //Number of interactions used for average | |
314 | fgWPathLength->SetParameter(2, 0); //Pathlength definition | |
315 | } | |
316 | ||
a42548b0 | 317 | void AliFastGlauber::Reset() const |
65aa45f2 | 318 | { |
319 | // | |
320 | // Reset dynamic allocated formulas | |
321 | // in case init is called twice | |
322 | ||
323 | if(fgWSb) delete fgWSb; | |
882b3108 | 324 | if(fgRWSb) delete fgRWSb; |
65aa45f2 | 325 | if(fgWSbz) delete fgWSbz; |
326 | if(fgWSz) delete fgWSz; | |
327 | if(fgWSta) delete fgWSta; | |
328 | if(fgWStarfi) delete fgWStarfi; | |
329 | if(fgWAlmond) delete fgWAlmond; | |
330 | if(fgWStaa) delete fgWStaa; | |
331 | if(fgWSgeo) delete fgWSgeo; | |
332 | if(fgWSbinary) delete fgWSbinary; | |
333 | if(fgWSN) delete fgWSN; | |
334 | if(fgWPathLength0) delete fgWPathLength0; | |
335 | if(fgWPathLength) delete fgWPathLength; | |
336 | if(fgWEnergyDensity) delete fgWEnergyDensity; | |
337 | if(fgWIntRadius) delete fgWIntRadius; | |
338 | if(fgWKParticipants) delete fgWKParticipants; | |
339 | if(fgWParticipants) delete fgWParticipants; | |
5b3a5a5d | 340 | } |
341 | ||
710a8d90 | 342 | void AliFastGlauber::DrawWSb() const |
5b3a5a5d | 343 | { |
65aa45f2 | 344 | // |
345 | // Draw Wood-Saxon Nuclear Density Function | |
346 | // | |
347 | TCanvas *c1 = new TCanvas("c1","Wood Saxon",400,10,600,700); | |
348 | c1->cd(); | |
882b3108 | 349 | Double_t max=fgWSb->GetMaximum(0.,fgBMax)*1.01; |
65aa45f2 | 350 | TH2F *h2f=new TH2F("h2fwsb","Wood Saxon: #rho(r) = n (1-#omega(r/r_{0})^2)/(1+exp((r-r_{0})/d)) [fm^{-3}]",2,0,fgBMax,2,0,max); |
351 | h2f->SetStats(0); | |
352 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
353 | h2f->GetYaxis()->SetNoExponent(kTRUE); | |
354 | h2f->GetYaxis()->SetTitle("#rho [fm^{-3}]"); | |
355 | h2f->Draw(); | |
356 | fgWSb->Draw("same"); | |
357 | TLegend *l1a = new TLegend(0.45,0.6,.90,0.8); | |
358 | l1a->SetFillStyle(0); | |
359 | l1a->SetBorderSize(0); | |
360 | Char_t label[100]; | |
bae6da3c | 361 | snprintf(label,100, "r_{0} = %.2f fm",fWSr0); |
65aa45f2 | 362 | l1a->AddEntry(fgWSb,label,""); |
bae6da3c | 363 | snprintf(label,100, "d = %.2f fm",fWSd); |
65aa45f2 | 364 | l1a->AddEntry(fgWSb,label,""); |
bae6da3c | 365 | snprintf(label,100, "n = %.2e fm^{-3}",fWSn); |
65aa45f2 | 366 | l1a->AddEntry(fgWSb,label,""); |
bae6da3c | 367 | snprintf(label,100, "#omega = %.2f",fWSw); |
65aa45f2 | 368 | l1a->AddEntry(fgWSb,label,""); |
369 | l1a->Draw(); | |
370 | c1->Update(); | |
5b3a5a5d | 371 | } |
372 | ||
710a8d90 | 373 | void AliFastGlauber::DrawOverlap() const |
5b3a5a5d | 374 | { |
65aa45f2 | 375 | // |
376 | // Draw Overlap Function | |
377 | // | |
378 | TCanvas *c2 = new TCanvas("c2","Overlap",400,10,600,700); | |
379 | c2->cd(); | |
380 | Double_t max=fgWStaa->GetMaximum(0,fgBMax)*1.01; | |
a42548b0 | 381 | TH2F *h2f=new TH2F("h2ftaa","Overlap function: T_{AB} [mbarn^{-1}]",2,0,fgBMax,2,0, max); |
65aa45f2 | 382 | h2f->SetStats(0); |
383 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
384 | h2f->GetYaxis()->SetTitle("T_{AB} [mbarn^{-1}]"); | |
385 | h2f->Draw(); | |
386 | fgWStaa->Draw("same"); | |
5b3a5a5d | 387 | } |
388 | ||
710a8d90 | 389 | void AliFastGlauber::DrawParticipants() const |
1bc228f5 | 390 | { |
65aa45f2 | 391 | // |
392 | // Draw Number of Participants Npart | |
393 | // | |
394 | TCanvas *c3 = new TCanvas("c3","Participants",400,10,600,700); | |
395 | c3->cd(); | |
396 | Double_t max=fgWParticipants->GetMaximum(0,fgBMax)*1.01; | |
397 | TH2F *h2f=new TH2F("h2fpart","Number of Participants",2,0,fgBMax,2,0,max); | |
398 | h2f->SetStats(0); | |
399 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
400 | h2f->GetYaxis()->SetTitle("N_{part}"); | |
401 | h2f->Draw(); | |
402 | fgWParticipants->Draw("same"); | |
403 | TLegend *l1a = new TLegend(0.50,0.75,.90,0.9); | |
404 | l1a->SetFillStyle(0); | |
405 | l1a->SetBorderSize(0); | |
406 | Char_t label[100]; | |
bae6da3c | 407 | snprintf(label,100, "#sigma^{inel.}_{NN} = %.1f mbarn",fSigmaNN); |
65aa45f2 | 408 | l1a->AddEntry(fgWParticipants,label,""); |
409 | l1a->Draw(); | |
410 | c3->Update(); | |
1bc228f5 | 411 | } |
412 | ||
710a8d90 | 413 | void AliFastGlauber::DrawThickness() const |
5b3a5a5d | 414 | { |
65aa45f2 | 415 | // |
416 | // Draw Thickness Function | |
417 | // | |
418 | TCanvas *c4 = new TCanvas("c4","Thickness",400,10,600,700); | |
419 | c4->cd(); | |
420 | Double_t max=fgWSta->GetMaximum(0,fgBMax)*1.01; | |
421 | TH2F *h2f=new TH2F("h2fta","Thickness function: T_{A} [fm^{-2}]",2,0,fgBMax,2,0,max); | |
422 | h2f->SetStats(0); | |
423 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
424 | h2f->GetYaxis()->SetTitle("T_{A} [fm^{-2}]"); | |
425 | h2f->Draw(); | |
426 | fgWSta->Draw("same"); | |
5b3a5a5d | 427 | } |
428 | ||
710a8d90 | 429 | void AliFastGlauber::DrawGeo() const |
5b3a5a5d | 430 | { |
65aa45f2 | 431 | // |
432 | // Draw Geometrical Cross-Section | |
433 | // | |
434 | TCanvas *c5 = new TCanvas("c5","Geometrical Cross-Section",400,10,600,700); | |
435 | c5->cd(); | |
436 | Double_t max=fgWSgeo->GetMaximum(0,fgBMax)*1.01; | |
437 | TH2F *h2f=new TH2F("h2fgeo","Differential Geometrical Cross-Section: d#sigma^{geo}_{AB}/db [fm]",2,0,fgBMax,2,0,max); | |
438 | h2f->SetStats(0); | |
439 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
440 | h2f->GetYaxis()->SetTitle("d#sigma^{geo}_{AB}/db [fm]"); | |
441 | h2f->Draw(); | |
442 | fgWSgeo->Draw("same"); | |
443 | TLegend *l1a = new TLegend(0.10,0.8,.40,0.9); | |
444 | l1a->SetFillStyle(0); | |
445 | l1a->SetBorderSize(0); | |
446 | Char_t label[100]; | |
bae6da3c | 447 | snprintf(label,100, "#sigma_{NN}^{inel.} = %.1f mbarn",fSigmaNN); |
65aa45f2 | 448 | l1a->AddEntry(fgWSgeo,label,""); |
449 | l1a->Draw(); | |
450 | c5->Update(); | |
5b3a5a5d | 451 | } |
452 | ||
710a8d90 | 453 | void AliFastGlauber::DrawBinary() const |
5b3a5a5d | 454 | { |
65aa45f2 | 455 | // |
456 | // Draw Binary Cross-Section | |
457 | // | |
458 | TCanvas *c6 = new TCanvas("c6","Binary Cross-Section",400,10,600,700); | |
459 | c6->cd(); | |
460 | Double_t max=fgWSbinary->GetMaximum(0,fgBMax)*1.01; | |
461 | TH2F *h2f=new TH2F("h2fbinary","Differential Binary Cross-Section: #sigma^{hard}_{NN} dT_{AB}/db [fm]",2,0,fgBMax,2,0,max); | |
462 | h2f->SetStats(0); | |
463 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
464 | h2f->GetYaxis()->SetTitle("d#sigma^{hard}_{AB}/db [fm]"); | |
465 | h2f->Draw(); | |
466 | fgWSbinary->Draw("same"); | |
467 | TLegend *l1a = new TLegend(0.50,0.8,.90,0.9); | |
468 | l1a->SetFillStyle(0); | |
469 | l1a->SetBorderSize(0); | |
470 | Char_t label[100]; | |
bae6da3c | 471 | snprintf(label,100, "#sigma_{NN}^{hard} = %.1f mbarn",fSigmaHard); |
65aa45f2 | 472 | l1a->AddEntry(fgWSb,label,""); |
473 | l1a->Draw(); | |
474 | c6->Update(); | |
5b3a5a5d | 475 | } |
476 | ||
710a8d90 | 477 | void AliFastGlauber::DrawN() const |
5b3a5a5d | 478 | { |
65aa45f2 | 479 | // |
480 | // Draw Binaries per event (Ncoll) | |
481 | // | |
482 | TCanvas *c7 = new TCanvas("c7","Binaries per event",400,10,600,700); | |
483 | c7->cd(); | |
882b3108 | 484 | Double_t max=fgWSN->GetMaximum(0.01,fgBMax)*1.01; |
65aa45f2 | 485 | TH2F *h2f=new TH2F("h2fhardcols","Number of hard collisions: T_{AB} #sigma^{hard}_{NN}/#sigma_{AB}^{geo}",2,0,fgBMax,2,0,max); |
486 | h2f->SetStats(0); | |
487 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
488 | h2f->GetYaxis()->SetTitle("N_{coll}"); | |
489 | h2f->Draw(); | |
490 | fgWSN->Draw("same"); | |
491 | TLegend *l1a = new TLegend(0.50,0.75,.90,0.9); | |
492 | l1a->SetFillStyle(0); | |
493 | l1a->SetBorderSize(0); | |
494 | Char_t label[100]; | |
bae6da3c | 495 | snprintf(label,100, "#sigma^{hard}_{NN} = %.1f mbarn",fSigmaHard); |
65aa45f2 | 496 | l1a->AddEntry(fgWSN,label,""); |
bae6da3c | 497 | snprintf(label,100, "#sigma^{inel.}_{NN} = %.1f mbarn",fSigmaNN); |
65aa45f2 | 498 | l1a->AddEntry(fgWSN,label,""); |
499 | l1a->Draw(); | |
500 | c7->Update(); | |
5b3a5a5d | 501 | } |
502 | ||
710a8d90 | 503 | void AliFastGlauber::DrawKernel(Double_t b) const |
5b3a5a5d | 504 | { |
65aa45f2 | 505 | // |
506 | // Draw Kernel | |
507 | // | |
508 | TCanvas *c8 = new TCanvas("c8","Kernel",400,10,600,700); | |
509 | c8->cd(); | |
510 | fgWStarfi->SetParameter(0, b); | |
511 | TH2F *h2f=new TH2F("h2fkernel","Kernel of Overlap function: d^{2}T_{AB}/dr/d#phi [fm^{-3}]",2,0,fgBMax,2,0,TMath::Pi()); | |
512 | h2f->SetStats(0); | |
513 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
514 | h2f->GetYaxis()->SetTitle("#phi [rad]"); | |
515 | h2f->Draw(); | |
516 | fgWStarfi->Draw("same"); | |
517 | TLegend *l1a = new TLegend(0.65,0.8,.90,0.9); | |
518 | l1a->SetFillStyle(0); | |
519 | l1a->SetBorderSize(0); | |
520 | Char_t label[100]; | |
bae6da3c | 521 | snprintf(label, 100, "b = %.1f fm",b); |
65aa45f2 | 522 | l1a->AddEntry(fgWStarfi,label,""); |
523 | l1a->Draw(); | |
524 | c8->Update(); | |
5b3a5a5d | 525 | } |
526 | ||
710a8d90 | 527 | void AliFastGlauber::DrawAlmond(Double_t b) const |
f3a04204 | 528 | { |
65aa45f2 | 529 | // |
530 | // Draw Interaction Almond | |
531 | // | |
532 | TCanvas *c9 = new TCanvas("c9","Almond",400,10,600,700); | |
533 | c9->cd(); | |
534 | fgWAlmond->SetParameter(0, b); | |
882b3108 | 535 | TH2F *h2f=new TH2F("h2falmond","Interaction Almond [fm^{-4}]",2,-fgBMax, fgBMax, 2, -fgBMax, fgBMax); |
65aa45f2 | 536 | h2f->SetStats(0); |
537 | h2f->GetXaxis()->SetTitle("x [fm]"); | |
538 | h2f->GetYaxis()->SetTitle("y [fm]"); | |
882b3108 | 539 | h2f->Draw(""); |
540 | gStyle->SetPalette(1); | |
541 | fgWAlmond->Draw("colzsame"); | |
65aa45f2 | 542 | TLegend *l1a = new TLegend(0.65,0.8,.90,0.9); |
543 | l1a->SetFillStyle(0); | |
544 | l1a->SetBorderSize(0); | |
545 | Char_t label[100]; | |
bae6da3c | 546 | snprintf(label, 100, "b = %.1f fm",b); |
65aa45f2 | 547 | l1a->AddEntry(fgWAlmond,label,""); |
548 | l1a->Draw(); | |
549 | c9->Update(); | |
f3a04204 | 550 | } |
551 | ||
710a8d90 | 552 | void AliFastGlauber::DrawEnergyDensity() const |
f3a04204 | 553 | { |
65aa45f2 | 554 | // |
555 | // Draw energy density | |
556 | // | |
557 | TCanvas *c10 = new TCanvas("c10","Energy Density",400, 10, 600, 700); | |
558 | c10->cd(); | |
559 | fgWEnergyDensity->SetMinimum(0.); | |
560 | Double_t max=fgWEnergyDensity->GetMaximum(0,fgWEnergyDensity->GetParameter(0))*1.01; | |
561 | TH2F *h2f=new TH2F("h2fenergydens","Energy density",2,0,fgBMax,2,0,max); | |
562 | h2f->SetStats(0); | |
563 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
564 | h2f->GetYaxis()->SetTitle("fm^{-4}"); | |
565 | h2f->Draw(); | |
566 | fgWEnergyDensity->Draw("same"); | |
567 | c10->Update(); | |
f3a04204 | 568 | } |
569 | ||
710a8d90 | 570 | void AliFastGlauber::DrawPathLength0(Double_t b, Int_t iopt) const |
f3a04204 | 571 | { |
65aa45f2 | 572 | // |
573 | // Draw Path Length | |
574 | // | |
575 | TCanvas *c11 = new TCanvas("c11","Path Length",400,10,600,700); | |
576 | c11->cd(); | |
577 | fgWPathLength0->SetParameter(0, b); | |
578 | fgWPathLength0->SetParameter(1, Double_t(iopt)); | |
579 | fgWPathLength0->SetMinimum(0.); | |
580 | fgWPathLength0->SetMaximum(10.); | |
581 | TH2F *h2f=new TH2F("h2fpathlength0","Path length",2,-TMath::Pi(), TMath::Pi(),2,0,10.); | |
582 | h2f->SetStats(0); | |
583 | h2f->GetXaxis()->SetTitle("#phi [rad]"); | |
584 | h2f->GetYaxis()->SetTitle("l [fm]"); | |
585 | h2f->Draw(); | |
586 | fgWPathLength0->Draw("same"); | |
f3a04204 | 587 | } |
588 | ||
710a8d90 | 589 | void AliFastGlauber::DrawPathLength(Double_t b , Int_t ni, Int_t iopt) const |
f3a04204 | 590 | { |
65aa45f2 | 591 | // |
592 | // Draw Path Length | |
593 | // | |
594 | TCanvas *c12 = new TCanvas("c12","Path Length",400,10,600,700); | |
595 | c12->cd(); | |
596 | fgWAlmond->SetParameter(0, b); | |
597 | fgWPathLength->SetParameter(0, b); | |
598 | fgWPathLength->SetParameter(1, Double_t (ni)); | |
599 | fgWPathLength->SetParameter(2, Double_t (iopt)); | |
600 | fgWPathLength->SetMinimum(0.); | |
601 | fgWPathLength->SetMaximum(10.); | |
602 | TH2F *h2f=new TH2F("h2fpathlength","Path length",2,-TMath::Pi(), TMath::Pi(),2,0,10.); | |
603 | h2f->SetStats(0); | |
604 | h2f->GetXaxis()->SetTitle("#phi [rad]"); | |
605 | h2f->GetYaxis()->SetTitle("l [fm]"); | |
606 | h2f->Draw(); | |
607 | fgWPathLength->Draw("same"); | |
f3a04204 | 608 | } |
609 | ||
710a8d90 | 610 | void AliFastGlauber::DrawIntRadius(Double_t b) const |
2a103154 | 611 | { |
65aa45f2 | 612 | // |
613 | // Draw Interaction Radius | |
614 | // | |
615 | TCanvas *c13 = new TCanvas("c13","Interaction Radius",400,10,600,700); | |
616 | c13->cd(); | |
617 | fgWIntRadius->SetParameter(0, b); | |
618 | fgWIntRadius->SetMinimum(0); | |
619 | Double_t max=fgWIntRadius->GetMaximum(0,fgBMax)*1.01; | |
620 | TH2F *h2f=new TH2F("h2fintradius","Interaction Density",2,0.,fgBMax,2,0,max); | |
621 | h2f->SetStats(0); | |
622 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
623 | h2f->GetYaxis()->SetTitle("[fm^{-3}]"); | |
624 | h2f->Draw(); | |
625 | fgWIntRadius->Draw("same"); | |
2a103154 | 626 | } |
627 | ||
0c13ae32 | 628 | Double_t AliFastGlauber::WSb(const Double_t* x, const Double_t* par) |
5b3a5a5d | 629 | { |
65aa45f2 | 630 | // |
631 | // Woods-Saxon Parameterisation | |
632 | // as a function of radius (xx) | |
633 | // | |
710a8d90 | 634 | const Double_t kxx = x[0]; //fm |
635 | const Double_t kr0 = par[0]; //fm | |
636 | const Double_t kd = par[1]; //fm | |
637 | const Double_t kw = par[2]; //no units | |
638 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
639 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 640 | return y; //fm^-3 |
5b3a5a5d | 641 | } |
642 | ||
882b3108 | 643 | Double_t AliFastGlauber::RWSb(const Double_t* x, const Double_t* par) |
644 | { | |
645 | // | |
646 | // Woods-Saxon Parameterisation | |
647 | // as a function of radius (xx) | |
648 | // times r**2 | |
649 | const Double_t kxx = x[0]; //fm | |
650 | const Double_t kr0 = par[0]; //fm | |
651 | const Double_t kd = par[1]; //fm | |
652 | const Double_t kw = par[2]; //no units | |
653 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
654 | Double_t y = kxx * kxx * kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
655 | ||
656 | return y; //fm^-1 | |
657 | } | |
658 | ||
0c13ae32 | 659 | Double_t AliFastGlauber::WSbz(const Double_t* x, const Double_t* par) |
5b3a5a5d | 660 | { |
65aa45f2 | 661 | // |
662 | // Wood Saxon Parameterisation | |
663 | // as a function of z and b | |
664 | // | |
710a8d90 | 665 | const Double_t kbb = x[0]; //fm |
666 | const Double_t kzz = x[1]; //fm | |
667 | const Double_t kr0 = par[0]; //fm | |
668 | const Double_t kd = par[1]; //fm | |
669 | const Double_t kw = par[2]; //no units | |
670 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
671 | const Double_t kxx = TMath::Sqrt(kbb*kbb+kzz*kzz); | |
672 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 673 | return y; //fm^-3 |
5b3a5a5d | 674 | } |
675 | ||
0c13ae32 | 676 | Double_t AliFastGlauber::WSz(const Double_t* x, const Double_t* par) |
5b3a5a5d | 677 | { |
65aa45f2 | 678 | // |
679 | // Wood Saxon Parameterisation | |
680 | // as a function of z for fixed b | |
681 | // | |
710a8d90 | 682 | const Double_t kzz = x[0]; //fm |
683 | const Double_t kr0 = par[0]; //fm | |
684 | const Double_t kd = par[1]; //fm | |
685 | const Double_t kw = par[2]; //no units | |
686 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
687 | const Double_t kbb = par[4]; //fm | |
688 | const Double_t kxx = TMath::Sqrt(kbb*kbb+kzz*kzz); | |
689 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 690 | return y; //fm^-3 |
5b3a5a5d | 691 | } |
692 | ||
0c13ae32 | 693 | Double_t AliFastGlauber::WSta(const Double_t* x, const Double_t* /*par*/) |
5b3a5a5d | 694 | { |
65aa45f2 | 695 | // |
696 | // Thickness function T_A | |
697 | // as a function of b | |
698 | // | |
710a8d90 | 699 | const Double_t kb = x[0]; |
700 | fgWSz->SetParameter(4, kb); | |
701 | Double_t y = 2. * fgWSz->Integral(0., fgBMax); | |
65aa45f2 | 702 | return y; //fm^-2 |
5b3a5a5d | 703 | } |
704 | ||
0c13ae32 | 705 | Double_t AliFastGlauber::WStarfi(const Double_t* x, const Double_t* par) |
5b3a5a5d | 706 | { |
65aa45f2 | 707 | // |
708 | // Kernel for overlap function: T_A(s)*T_A(s-b) | |
709 | // as a function of r and phi | |
710a8d90 | 710 | const Double_t kr1 = x[0]; |
711 | const Double_t kphi = x[1]; | |
712 | const Double_t kb = par[0]; | |
713 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
714 | Double_t y = kr1 * fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 715 | return y; //fm^-3 |
716 | } | |
717 | ||
0c13ae32 | 718 | Double_t AliFastGlauber::WStaa(const Double_t* x, const Double_t* par) |
65aa45f2 | 719 | { |
720 | // | |
721 | // Overlap function | |
722 | // T_{AB}=Int d2s T_A(s)*T_B(s-b) | |
723 | // as a function of b | |
724 | // (normalized to fA*fB) | |
725 | // | |
710a8d90 | 726 | const Double_t kb = x[0]; |
727 | const Double_t ka = par[0]; | |
728 | fgWStarfi->SetParameter(0, kb); | |
65aa45f2 | 729 | |
730 | // root integration seems to fail | |
731 | /* | |
732 | Double_t al[2]; | |
733 | Double_t bl[2]; | |
734 | al[0] = 1e-6; | |
735 | al[1] = fgBMax; | |
736 | bl[0] = 0.; | |
737 | bl[1] = TMath::Pi(); | |
738 | Double_t err; | |
739 | ||
740 | Double_t y = 2. * 208. * 208. * fgWStarfi->IntegralMultiple(2, al, bl, 0.001, err); | |
741 | printf("WStaa: %.5e %.5e %.5e\n", b, y, err); | |
742 | */ | |
743 | ||
744 | // | |
745 | // MC Integration | |
746 | // | |
747 | Double_t y = 0; | |
a42548b0 | 748 | |
749 | ||
65aa45f2 | 750 | for (Int_t i = 0; i < fgkMCInts; i++) |
751 | { | |
a42548b0 | 752 | |
710a8d90 | 753 | const Double_t kphi = TMath::Pi() * gRandom->Rndm(); |
754 | const Double_t kb1 = fgBMax * gRandom->Rndm(); | |
755 | y += fgWStarfi->Eval(kb1, kphi); | |
65aa45f2 | 756 | } |
757 | y *= 2. * TMath::Pi() * fgBMax / fgkMCInts; //fm^-2 | |
710a8d90 | 758 | y *= ka * ka * 0.1; //mbarn^-1 |
65aa45f2 | 759 | return y; |
5b3a5a5d | 760 | } |
761 | ||
0c13ae32 | 762 | Double_t AliFastGlauber::WKParticipants(const Double_t* x, const Double_t* par) |
1bc228f5 | 763 | { |
65aa45f2 | 764 | // |
765 | // Kernel for number of participants | |
766 | // as a function of r and phi | |
767 | // | |
710a8d90 | 768 | const Double_t kr1 = x[0]; |
769 | const Double_t kphi = x[1]; | |
770 | const Double_t kb = par[0]; //fm | |
771 | const Double_t ksig = par[1]; //mbarn | |
772 | const Double_t ka = par[2]; //mass number | |
773 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 +kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
774 | const Double_t kxsi = fgWSta->Eval(kr2) * ksig * 0.1; //no units | |
65aa45f2 | 775 | /* |
710a8d90 | 776 | Double_t y=(1-TMath::Power((1-xsi),aa)) |
65aa45f2 | 777 | */ |
710a8d90 | 778 | Double_t a = ka; |
779 | Double_t sum = ka * kxsi; | |
65aa45f2 | 780 | Double_t y = sum; |
710a8d90 | 781 | for (Int_t i = 1; i <= ka; i++) |
1bc228f5 | 782 | { |
65aa45f2 | 783 | a--; |
710a8d90 | 784 | sum *= (-kxsi) * a / Float_t(i+1); |
65aa45f2 | 785 | y += sum; |
1bc228f5 | 786 | } |
710a8d90 | 787 | y *= kr1 * fgWSta->Eval(kr1); |
65aa45f2 | 788 | return y; //fm^-1 |
1bc228f5 | 789 | } |
790 | ||
0c13ae32 | 791 | Double_t AliFastGlauber::WParticipants(const Double_t* x, const Double_t* par) |
65aa45f2 | 792 | { |
793 | // | |
794 | // Number of Participants as | |
795 | // a function of b | |
796 | // | |
710a8d90 | 797 | const Double_t kb = x[0]; |
798 | const Double_t ksig = par[0]; //mbarn | |
799 | const Double_t ka = par[1]; //mass number | |
800 | fgWKParticipants->SetParameter(0, kb); | |
801 | fgWKParticipants->SetParameter(1, ksig); | |
802 | fgWKParticipants->SetParameter(2, ka); | |
65aa45f2 | 803 | |
804 | // | |
805 | // MC Integration | |
806 | // | |
807 | Double_t y = 0; | |
808 | for (Int_t i = 0; i < fgkMCInts; i++) | |
809 | { | |
710a8d90 | 810 | const Double_t kphi = TMath::Pi() * gRandom->Rndm(); |
811 | const Double_t kb1 = fgBMax * gRandom->Rndm(); | |
812 | y += fgWKParticipants->Eval(kb1, kphi); | |
65aa45f2 | 813 | } |
710a8d90 | 814 | y *= 2. * ka * 2. * TMath::Pi() * fgBMax / fgkMCInts; |
65aa45f2 | 815 | return y; //no units |
816 | } | |
817 | ||
0c13ae32 | 818 | Double_t AliFastGlauber::WSgeo(const Double_t* x, const Double_t* par) |
65aa45f2 | 819 | { |
820 | // | |
821 | // Geometrical Cross-Section | |
822 | // as a function of b | |
823 | // | |
710a8d90 | 824 | const Double_t kb = x[0]; //fm |
825 | const Double_t ksigNN = par[0]; //mbarn | |
826 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
827 | Double_t y = 2. * TMath::Pi() * kb * (1. - TMath::Exp(- ksigNN * ktaa)); | |
65aa45f2 | 828 | return y; //fm |
829 | } | |
830 | ||
0c13ae32 | 831 | Double_t AliFastGlauber::WSbinary(const Double_t* x, const Double_t* par) |
65aa45f2 | 832 | { |
833 | // | |
710a8d90 | 834 | // Number of binary hard collisions |
65aa45f2 | 835 | // as a function of b |
836 | // | |
710a8d90 | 837 | const Double_t kb = x[0]; //fm |
838 | const Double_t ksig = par[0]; //mbarn | |
839 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
840 | Double_t y = 2. * TMath::Pi() * kb * ksig * ktaa; | |
65aa45f2 | 841 | return y; //fm |
842 | } | |
843 | ||
0c13ae32 | 844 | Double_t AliFastGlauber::WSN(const Double_t* x, const Double_t* /*par*/) |
65aa45f2 | 845 | { |
846 | // | |
847 | // Number of hard processes per event | |
848 | // as a function of b | |
710a8d90 | 849 | const Double_t kb = x[0]; |
850 | Double_t y = fgWSbinary->Eval(kb)/fgWSgeo->Eval(kb); | |
65aa45f2 | 851 | return y; //no units |
852 | } | |
853 | ||
0c13ae32 | 854 | Double_t AliFastGlauber::WEnergyDensity(const Double_t* x, const Double_t* par) |
65aa45f2 | 855 | { |
856 | // | |
857 | // Initial energy density | |
858 | // as a function of the impact parameter | |
859 | // | |
710a8d90 | 860 | const Double_t kb = x[0]; |
861 | const Double_t krA = par[0]; | |
65aa45f2 | 862 | // |
863 | // Attention: area of transverse reaction zone in hard-sphere approximation ! | |
710a8d90 | 864 | const Double_t krA2=krA*krA; |
865 | const Double_t kb2=kb*kb; | |
866 | const Double_t ksaa = (TMath::Pi() - 2. * TMath::ASin(kb/ 2./ krA)) * krA2 | |
867 | - kb * TMath::Sqrt(krA2 - kb2/ 4.); //fm^2 | |
868 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
869 | Double_t y=ktaa/ksaa*10; | |
65aa45f2 | 870 | return y; //fm^-4 |
871 | } | |
5b3a5a5d | 872 | |
0c13ae32 | 873 | Double_t AliFastGlauber::WAlmond(const Double_t* x, const Double_t* par) |
f3a04204 | 874 | { |
65aa45f2 | 875 | // |
876 | // Almond shaped interaction region | |
877 | // as a function of cartesian x,y. | |
878 | // | |
710a8d90 | 879 | const Double_t kb = par[0]; |
880 | const Double_t kxx = x[0] + kb/2.; | |
881 | const Double_t kyy = x[1]; | |
882 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
883 | const Double_t kphi = TMath::ATan2(kyy,kxx); | |
884 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
65aa45f2 | 885 | // |
886 | // Interaction probability calculated as product of thicknesses | |
887 | // | |
710a8d90 | 888 | Double_t y = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); |
65aa45f2 | 889 | return y; //fm^-4 |
f3a04204 | 890 | } |
891 | ||
0c13ae32 | 892 | Double_t AliFastGlauber::WIntRadius(const Double_t* x, const Double_t* par) |
f3a04204 | 893 | { |
65aa45f2 | 894 | // |
895 | // Average interaction density over radius | |
896 | // at which interaction takes place | |
897 | // as a function of radius | |
898 | // | |
710a8d90 | 899 | const Double_t kr = x[0]; |
900 | const Double_t kb = par[0]; | |
901 | fgWAlmond->SetParameter(0, kb); | |
65aa45f2 | 902 | // Average over phi in small steps |
710a8d90 | 903 | const Double_t kdphi = 2. * TMath::Pi() / 100.; |
65aa45f2 | 904 | Double_t phi = 0.; |
905 | Double_t y = 0.; | |
906 | for (Int_t i = 0; i < 100; i++) { | |
710a8d90 | 907 | const Double_t kxx = kr * TMath::Cos(phi); |
908 | const Double_t kyy = kr * TMath::Sin(phi); | |
909 | y += fgWAlmond->Eval(kxx,kyy); | |
910 | phi += kdphi; | |
65aa45f2 | 911 | } // phi loop |
912 | // Result multiplied by Jacobian (2 pi r) | |
710a8d90 | 913 | y *= 2. * TMath::Pi() * kr / 100.; |
65aa45f2 | 914 | return y; //fm^-3 |
f3a04204 | 915 | } |
916 | ||
0c13ae32 | 917 | Double_t AliFastGlauber::WPathLength0(const Double_t* x, const Double_t* par) |
f3a04204 | 918 | { |
65aa45f2 | 919 | // |
920 | // Path Length as a function of phi | |
921 | // for interaction point fixed at (0,0) | |
922 | // as a function of phi-direction | |
923 | // | |
924 | // Phi direction in Almond | |
710a8d90 | 925 | const Double_t kphi0 = x[0]; |
926 | const Double_t kb = par[0]; | |
65aa45f2 | 927 | // Path Length definition |
710a8d90 | 928 | const Int_t kiopt = Int_t(par[1]); |
65aa45f2 | 929 | |
930 | // Step along radial direction phi | |
931 | const Int_t kNp = 100; // Steps in r | |
932 | const Double_t kDr = fgBMax/kNp; | |
933 | Double_t r = 0.; | |
934 | Double_t rw = 0.; | |
935 | Double_t w = 0.; | |
936 | for (Int_t i = 0; i < kNp; i++) { | |
937 | // | |
938 | // Transform into target frame | |
939 | // | |
710a8d90 | 940 | const Double_t kxx = r * TMath::Cos(kphi0) + kb / 2.; |
941 | const Double_t kyy = r * TMath::Sin(kphi0); | |
942 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
943 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 944 | // Radius in projectile frame |
710a8d90 | 945 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); |
946 | const Double_t ky = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 947 | |
710a8d90 | 948 | rw += ky * r; |
949 | w += ky; | |
65aa45f2 | 950 | r += kDr; |
951 | } // radial steps | |
952 | ||
953 | Double_t y=0.; | |
ed79c723 | 954 | if (!kiopt) { // My length definition (is exact for hard disk) |
955 | if(w) y= 2. * rw / w; | |
956 | } else { | |
957 | const Double_t knorm=fgWSta->Eval(1e-4); | |
958 | if(knorm) y = TMath::Sqrt(2. * rw * kDr / knorm / knorm); | |
65aa45f2 | 959 | } |
960 | return y; //fm | |
961 | } | |
962 | ||
0c13ae32 | 963 | Double_t AliFastGlauber::WPathLength(const Double_t* x, const Double_t* par) |
65aa45f2 | 964 | { |
965 | // | |
966 | // Path Length as a function of phi | |
967 | // Interaction point from random distribution | |
968 | // as a function of the phi-direction | |
710a8d90 | 969 | const Double_t kphi0 = x[0]; |
970 | const Double_t kb = par[0]; | |
971 | fgWAlmond->SetParameter(0, kb); | |
972 | const Int_t kNpi = Int_t (par[1]); //Number of interactions | |
973 | const Int_t kiopt = Int_t(par[2]); //Path Length definition | |
65aa45f2 | 974 | |
975 | // | |
976 | // r-steps | |
977 | // | |
978 | const Int_t kNp = 100; | |
979 | const Double_t kDr = fgBMax/Double_t(kNp); | |
980 | Double_t l = 0.; // Path length | |
981 | for (Int_t in = 0; in < kNpi; in ++) { | |
f3a04204 | 982 | Double_t rw = 0.; |
983 | Double_t w = 0.; | |
65aa45f2 | 984 | // Interaction point |
985 | Double_t x0, y0; | |
986 | fgWAlmond->GetRandom2(x0, y0); | |
987 | // Initial radius | |
710a8d90 | 988 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
989 | const Int_t knps = Int_t ((fgBMax - kr0)/kDr) - 1; | |
f3a04204 | 990 | |
65aa45f2 | 991 | // Radial steps |
992 | Double_t r = 0.; | |
710a8d90 | 993 | for (Int_t i = 0; (i < knps ); i++) { |
65aa45f2 | 994 | // Transform into target frame |
710a8d90 | 995 | const Double_t kxx = x0 + r * TMath::Cos(kphi0) + kb / 2.; |
996 | const Double_t kyy = y0 + r * TMath::Sin(kphi0); | |
997 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
998 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 999 | // Radius in projectile frame |
710a8d90 | 1000 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); |
1001 | const Double_t ky = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 1002 | |
710a8d90 | 1003 | rw += ky * r; |
1004 | w += ky; | |
65aa45f2 | 1005 | r += kDr; |
1006 | } // steps | |
1007 | // Average over interactions | |
710a8d90 | 1008 | if (!kiopt) { |
65aa45f2 | 1009 | if(w) l += (2. * rw / w); |
8de7e046 | 1010 | } else { |
710a8d90 | 1011 | const Double_t knorm=fgWSta->Eval(1e-4); |
1012 | if(knorm) l+= 2. * rw * kDr / knorm / knorm; | |
8de7e046 | 1013 | } |
65aa45f2 | 1014 | } // interactions |
1015 | Double_t ret=0; | |
710a8d90 | 1016 | if (!kiopt) |
65aa45f2 | 1017 | ret= l / kNpi; |
1018 | else | |
1019 | ret=TMath::Sqrt( l / kNpi); | |
1020 | return ret; //fm | |
f3a04204 | 1021 | } |
1022 | ||
710a8d90 | 1023 | Double_t AliFastGlauber::CrossSection(Double_t b1, Double_t b2) const |
f3a04204 | 1024 | { |
65aa45f2 | 1025 | // |
1026 | // Return the geometrical cross-section integrated from b1 to b2 | |
1027 | // | |
1028 | return fgWSgeo->Integral(b1, b2)*10.; //mbarn | |
1029 | } | |
f3a04204 | 1030 | |
710a8d90 | 1031 | Double_t AliFastGlauber::HardCrossSection(Double_t b1, Double_t b2) const |
5b3a5a5d | 1032 | { |
65aa45f2 | 1033 | // |
1034 | // Return the hard cross-section integrated from b1 to b2 | |
1035 | // | |
1036 | return fgWSbinary->Integral(b1, b2)*10.; //mbarn | |
5b3a5a5d | 1037 | } |
1038 | ||
710a8d90 | 1039 | Double_t AliFastGlauber::FractionOfHardCrossSection(Double_t b1, Double_t b2) const |
1bc228f5 | 1040 | { |
65aa45f2 | 1041 | // |
148c5ce5 | 1042 | // Return fraction of hard cross-section integrated from b1 to b2 |
65aa45f2 | 1043 | // |
1044 | return fgWSbinary->Integral(b1, b2)/fgWSbinary->Integral(0., 100.); | |
1bc228f5 | 1045 | } |
1046 | ||
0c13ae32 | 1047 | Double_t AliFastGlauber::NHard(const Double_t b1, const Double_t b2) const |
f762082f | 1048 | { |
1049 | // | |
1050 | // Number of binary hard collisions | |
1051 | // as a function of b (nucl/ex/0302016 eq. 19) | |
1052 | // | |
1053 | const Double_t kshard=HardCrossSection(b1,b2); | |
1054 | const Double_t ksgeo=CrossSection(b1,b2); | |
1055 | if(ksgeo>0) | |
1056 | return kshard/ksgeo; | |
1057 | else return -1; | |
1058 | } | |
1059 | ||
710a8d90 | 1060 | Double_t AliFastGlauber::Binaries(Double_t b) const |
5b3a5a5d | 1061 | { |
65aa45f2 | 1062 | // |
710a8d90 | 1063 | // Return number of binary hard collisions normalized to 1 at b=0 |
65aa45f2 | 1064 | // |
d206dc95 | 1065 | if(b < 1.e-4) b = 1e-4; |
65aa45f2 | 1066 | return fgWSN->Eval(b)/fgWSN->Eval(1e-4); |
5b3a5a5d | 1067 | } |
1068 | ||
a42548b0 | 1069 | Double_t AliFastGlauber::MeanOverlap(Double_t b1, Double_t b2) |
1070 | { | |
1071 | // | |
1072 | // Calculate the mean overlap for impact parameter range b1 .. b2 | |
1073 | // | |
1074 | Double_t sum = 0.; | |
1075 | Double_t sumc = 0.; | |
1076 | Double_t b = b1; | |
1077 | ||
1078 | while (b < b2-0.005) { | |
1079 | Double_t nc = GetNumberOfCollisions(b); | |
1080 | sum += 10. * fgWStaa->Eval(b) * fgWSgeo->Eval(b) * 0.01 / (1. - TMath::Exp(-nc)); | |
1081 | sumc += 10. * fgWSgeo->Eval(b) * 0.01; | |
1082 | b += 0.01; | |
1083 | } | |
1084 | return (sum / CrossSection(b1, b2)); | |
1085 | } | |
1086 | ||
1087 | ||
1088 | Double_t AliFastGlauber::MeanNumberOfCollisionsPerEvent(Double_t b1, Double_t b2) | |
1089 | { | |
1090 | // | |
1091 | // Calculate the mean number of collisions per event for impact parameter range b1 .. b2 | |
1092 | // | |
1093 | Double_t sum = 0.; | |
1094 | Double_t sumc = 0.; | |
1095 | Double_t b = b1; | |
1096 | ||
1097 | while (b < b2-0.005) { | |
1098 | Double_t nc = GetNumberOfCollisions(b); | |
1099 | sum += nc / (1. - TMath::Exp(-nc)) * 10. * fgWSgeo->Eval(b) * 0.01; | |
1100 | sumc += 10. * fgWSgeo->Eval(b) * 0.01; | |
1101 | b += 0.01; | |
1102 | } | |
1103 | return (sum / CrossSection(b1, b2)); | |
1104 | } | |
1105 | ||
1106 | ||
710a8d90 | 1107 | Double_t AliFastGlauber::GetNumberOfBinaries(Double_t b) const |
5b3a5a5d | 1108 | { |
65aa45f2 | 1109 | // |
710a8d90 | 1110 | // Return number of binary hard collisions at b |
65aa45f2 | 1111 | // |
d206dc95 | 1112 | if(b<1.e-4) b=1e-4; |
65aa45f2 | 1113 | return fgWSN->Eval(b); |
5b3a5a5d | 1114 | } |
1115 | ||
710a8d90 | 1116 | Double_t AliFastGlauber::Participants(Double_t b) const |
5b3a5a5d | 1117 | { |
65aa45f2 | 1118 | // |
1119 | // Return the number of participants normalized to 1 at b=0 | |
1120 | // | |
d206dc95 | 1121 | if(b<1.e-4) b=1e-4; |
65aa45f2 | 1122 | return (fgWParticipants->Eval(b)/fgWParticipants->Eval(1e-4)); |
5b3a5a5d | 1123 | } |
1124 | ||
710a8d90 | 1125 | Double_t AliFastGlauber::GetNumberOfParticipants(Double_t b) const |
2a103154 | 1126 | { |
65aa45f2 | 1127 | // |
1128 | // Return the number of participants for impact parameter b | |
1129 | // | |
d206dc95 | 1130 | if(b<1.e-4) b=1e-4; |
65aa45f2 | 1131 | return (fgWParticipants->Eval(b)); |
2a103154 | 1132 | } |
1133 | ||
710a8d90 | 1134 | Double_t AliFastGlauber::GetNumberOfCollisions(Double_t b) const |
1135 | { | |
1136 | // | |
1137 | // Return the number of collisions for impact parameter b | |
1138 | // | |
d206dc95 | 1139 | if(b<1.e-4) b=1e-4; |
710a8d90 | 1140 | return (fgWStaa->Eval(b)*fSigmaNN); |
1141 | } | |
1142 | ||
148c5ce5 | 1143 | Double_t AliFastGlauber::GetNumberOfCollisionsPerEvent(Double_t b) const |
1144 | { | |
1145 | // | |
1146 | // Return the number of collisions per event (at least one collision) | |
1147 | // for impact parameter b | |
1148 | // | |
1149 | Double_t n = GetNumberOfCollisions(b); | |
1150 | if (n > 0.) { | |
1151 | return (n / (1. - TMath::Exp(- n))); | |
1152 | } else { | |
1153 | return (0.); | |
1154 | } | |
1155 | } | |
1156 | ||
5b3a5a5d | 1157 | void AliFastGlauber::SimulateTrigger(Int_t n) |
1158 | { | |
65aa45f2 | 1159 | // |
1160 | // Simulates Trigger | |
1161 | // | |
1162 | TH1F* mbtH = new TH1F("mbtH", "MB Trigger b-Distribution", 100, 0., 20.); | |
1163 | TH1F* hdtH = new TH1F("hdtH", "Hard Trigger b-Distribution", 100, 0., 20.); | |
1164 | TH1F* mbmH = new TH1F("mbmH", "MB Trigger Multiplicity Distribution", 100, 0., 8000.); | |
1165 | TH1F* hdmH = new TH1F("hdmH", "Hard Trigger Multiplicity Distribution", 100, 0., 8000.); | |
5b3a5a5d | 1166 | |
65aa45f2 | 1167 | mbtH->SetXTitle("b [fm]"); |
1168 | hdtH->SetXTitle("b [fm]"); | |
1169 | mbmH->SetXTitle("Multiplicity"); | |
1170 | hdmH->SetXTitle("Multiplicity"); | |
5b3a5a5d | 1171 | |
65aa45f2 | 1172 | TCanvas *c0 = new TCanvas("c0","Trigger Simulation",400,10,600,700); |
1173 | c0->Divide(2,1); | |
1174 | TCanvas *c1 = new TCanvas("c1","Trigger Simulation",400,10,600,700); | |
1175 | c1->Divide(1,2); | |
5b3a5a5d | 1176 | |
65aa45f2 | 1177 | // |
1178 | // | |
1179 | Init(1); | |
1180 | for (Int_t iev = 0; iev < n; iev++) | |
5b3a5a5d | 1181 | { |
65aa45f2 | 1182 | Float_t b, p, mult; |
1183 | GetRandom(b, p, mult); | |
1184 | mbtH->Fill(b,1.); | |
1185 | hdtH->Fill(b, p); | |
1186 | mbmH->Fill(mult, 1.); | |
1187 | hdmH->Fill(mult, p); | |
1188 | ||
1189 | c0->cd(1); | |
1190 | mbtH->Draw(); | |
1191 | c0->cd(2); | |
1192 | hdtH->Draw(); | |
1193 | c0->Update(); | |
1194 | ||
1195 | c1->cd(1); | |
1196 | mbmH->Draw(); | |
1197 | c1->cd(2); | |
1198 | hdmH->Draw(); | |
1199 | c1->Update(); | |
5b3a5a5d | 1200 | } |
1201 | } | |
1202 | ||
1203 | void AliFastGlauber::GetRandom(Float_t& b, Float_t& p, Float_t& mult) | |
1204 | { | |
65aa45f2 | 1205 | // |
1206 | // Gives back a random impact parameter, hard trigger probability and multiplicity | |
1207 | // | |
1208 | b = fgWSgeo->GetRandom(); | |
710a8d90 | 1209 | const Float_t kmu = fgWSN->Eval(b); |
1210 | p = 1.-TMath::Exp(-kmu); | |
1211 | mult = 6000./fgWSN->Eval(1.) * kmu; | |
5b3a5a5d | 1212 | } |
1213 | ||
c2140715 | 1214 | void AliFastGlauber::GetRandom(Int_t& bin, Bool_t& hard) |
1215 | { | |
65aa45f2 | 1216 | // |
1217 | // Gives back a random impact parameter bin, and hard trigger decission | |
1218 | // | |
710a8d90 | 1219 | const Float_t kb = fgWSgeo->GetRandom(); |
1220 | const Float_t kmu = fgWSN->Eval(kb) * fSigmaHard; | |
1221 | const Float_t kp = 1.-TMath::Exp(-kmu); | |
1222 | if (kb < 5.) { | |
65aa45f2 | 1223 | bin = 1; |
710a8d90 | 1224 | } else if (kb < 8.6) { |
65aa45f2 | 1225 | bin = 2; |
710a8d90 | 1226 | } else if (kb < 11.2) { |
65aa45f2 | 1227 | bin = 3; |
710a8d90 | 1228 | } else if (kb < 13.2) { |
65aa45f2 | 1229 | bin = 4; |
710a8d90 | 1230 | } else if (kb < 15.0) { |
65aa45f2 | 1231 | bin = 5; |
1232 | } else { | |
1233 | bin = 6; | |
1234 | } | |
1235 | hard = kFALSE; | |
710a8d90 | 1236 | const Float_t kr = gRandom->Rndm(); |
1237 | if (kr < kp) hard = kTRUE; | |
c2140715 | 1238 | } |
1239 | ||
65aa45f2 | 1240 | Double_t AliFastGlauber::GetRandomImpactParameter(Double_t bmin, Double_t bmax) |
5b3a5a5d | 1241 | { |
65aa45f2 | 1242 | // |
1243 | // Gives back a random impact parameter in the range bmin .. bmax | |
1244 | // | |
1245 | Float_t b = -1.; | |
1246 | while(b < bmin || b > bmax) | |
1247 | b = fgWSgeo->GetRandom(); | |
1248 | return b; | |
5b3a5a5d | 1249 | } |
1250 | ||
710a8d90 | 1251 | void AliFastGlauber::StoreFunctions() const |
5b3a5a5d | 1252 | { |
65aa45f2 | 1253 | // |
1254 | // Store in file functions | |
1255 | // | |
1256 | TFile* ff = new TFile(fName.Data(),"recreate"); | |
1257 | fgWStaa->Write("WStaa"); | |
1258 | fgWParticipants->Write("WParticipants"); | |
1259 | ff->Close(); | |
1260 | return; | |
5b3a5a5d | 1261 | } |
1262 | ||
65aa45f2 | 1263 | //=================== Added by A. Dainese 11/02/04 =========================== |
1bc228f5 | 1264 | |
710a8d90 | 1265 | void AliFastGlauber::StoreAlmonds() const |
5b3a5a5d | 1266 | { |
65aa45f2 | 1267 | // |
1268 | // Store in file | |
1269 | // 40 almonds for b = (0.25+k*0.5) fm (k=0->39) | |
1270 | // | |
1271 | Char_t almondName[100]; | |
1272 | TFile* ff = new TFile(fName.Data(),"update"); | |
1273 | for(Int_t k=0; k<40; k++) { | |
bae6da3c | 1274 | snprintf(almondName, 100, "WAlmondFixedB%d",k); |
65aa45f2 | 1275 | Double_t b = 0.25+k*0.5; |
1276 | Info("StoreAlmonds"," b = %f\n",b); | |
1277 | fgWAlmond->SetParameter(0,b); | |
1278 | fgWAlmond->Write(almondName); | |
1279 | } | |
1280 | ff->Close(); | |
1281 | return; | |
5b3a5a5d | 1282 | } |
a2f2f511 | 1283 | |
a2f2f511 | 1284 | void AliFastGlauber::SetCentralityClass(Double_t xsecFrLow,Double_t xsecFrUp) |
1285 | { | |
1286 | // | |
65aa45f2 | 1287 | // Set limits of centrality class as fractions |
1288 | // of the geomtrical cross section | |
a2f2f511 | 1289 | // |
1290 | if(xsecFrLow>1. || xsecFrUp>1. || xsecFrLow>xsecFrUp) { | |
65aa45f2 | 1291 | Error("SetCentralityClass", "Please set 0 <= xsecFrLow <= xsecFrUp <= 1\n"); |
a2f2f511 | 1292 | return; |
1293 | } | |
1294 | ||
1295 | Double_t bLow=0.,bUp=0.; | |
1296 | Double_t xsecFr=0.; | |
710a8d90 | 1297 | const Double_t knorm=fgWSgeo->Integral(0.,100.); |
a2f2f511 | 1298 | while(xsecFr<xsecFrLow) { |
710a8d90 | 1299 | xsecFr = fgWSgeo->Integral(0.,bLow)/knorm; |
a2f2f511 | 1300 | bLow += 0.1; |
1301 | } | |
1302 | bUp = bLow; | |
1303 | while(xsecFr<xsecFrUp) { | |
710a8d90 | 1304 | xsecFr = fgWSgeo->Integral(0.,bUp)/knorm; |
a2f2f511 | 1305 | bUp += 0.1; |
1306 | } | |
1307 | ||
710a8d90 | 1308 | Info("SetCentralityClass", "Centrality class: %4.2f-%4.2f; %4.1f < b < %4.1f fm", |
a2f2f511 | 1309 | xsecFrLow,xsecFrUp,bLow,bUp); |
a2f2f511 | 1310 | fgWSbinary->SetRange(bLow,bUp); |
710a8d90 | 1311 | fBmin=bLow; |
1312 | fBmax=bUp; | |
a2f2f511 | 1313 | return; |
1314 | } | |
1315 | ||
1316 | void AliFastGlauber::GetRandomBHard(Double_t& b) | |
1317 | { | |
1318 | // | |
1319 | // Get random impact parameter according to distribution of | |
1320 | // hard (binary) cross-section, in the range defined by the centrality class | |
1321 | // | |
1322 | b = fgWSbinary->GetRandom(); | |
1323 | Int_t bin = 2*(Int_t)b; | |
1324 | if( (b-(Int_t)b) > 0.5) bin++; | |
7f2f270b | 1325 | fgWAlmondCurrent = fgWAlmondFixedB[bin]; |
a2f2f511 | 1326 | return; |
1327 | } | |
1328 | ||
1329 | void AliFastGlauber::GetRandomXY(Double_t& x,Double_t& y) | |
1330 | { | |
1331 | // | |
1332 | // Get random position of parton production point according to | |
1333 | // product of thickness functions | |
1334 | // | |
65aa45f2 | 1335 | fgWAlmondCurrent->GetRandom2(x,y); |
a2f2f511 | 1336 | return; |
1337 | } | |
1338 | ||
1339 | void AliFastGlauber::GetRandomPhi(Double_t& phi) | |
1340 | { | |
1341 | // | |
1342 | // Get random parton azimuthal propagation direction | |
1343 | // | |
1344 | phi = 2.*TMath::Pi()*gRandom->Rndm(); | |
1345 | return; | |
1346 | } | |
1347 | ||
65aa45f2 | 1348 | Double_t AliFastGlauber::CalculateLength(Double_t b,Double_t x0,Double_t y0,Double_t phi0) |
a2f2f511 | 1349 | { |
1350 | // | |
1351 | // Calculate path length for a parton with production point (x0,y0) | |
1352 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
1353 | // in a collision with impact parameter b | |
1354 | // | |
1355 | ||
1356 | // number of steps in l | |
1357 | const Int_t kNp = 100; | |
1358 | const Double_t kDl = fgBMax/Double_t(kNp); | |
1359 | ||
a2f2f511 | 1360 | if(fEllDef==1) { |
1361 | // | |
1362 | // Definition 1: | |
1363 | // | |
65aa45f2 | 1364 | // ell = 2 * \int_0^\infty dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) / |
1365 | // \int_0^\infty dl*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
a2f2f511 | 1366 | // |
a2f2f511 | 1367 | |
a2f2f511 | 1368 | // Initial radius |
710a8d90 | 1369 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
1370 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
65aa45f2 | 1371 | Double_t l = 0.; |
1372 | Double_t integral1 = 0.; | |
1373 | Double_t integral2 = 0.; | |
a2f2f511 | 1374 | // Radial steps |
710a8d90 | 1375 | for (Int_t i = 0; i < knps; i++) { |
a2f2f511 | 1376 | |
1377 | // Transform into target frame | |
710a8d90 | 1378 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1379 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1380 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1381 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
a2f2f511 | 1382 | // Radius in projectile frame |
710a8d90 | 1383 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1384 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
a2f2f511 | 1385 | |
710a8d90 | 1386 | integral1 += kprodTATB * l * kDl; |
1387 | integral2 += kprodTATB * kDl; | |
a2f2f511 | 1388 | l += kDl; |
1389 | } // steps | |
1390 | ||
65aa45f2 | 1391 | Double_t ell=0.; |
1392 | if(integral2) | |
1393 | ell = (2. * integral1 / integral2); | |
a2f2f511 | 1394 | return ell; |
a2f2f511 | 1395 | } else if(fEllDef==2) { |
1396 | // | |
1397 | // Definition 2: | |
1398 | // | |
1399 | // ell = \int_0^\infty dl* | |
65aa45f2 | 1400 | // \Theta((T_A*T_B)(x0+l*ux,y0+l*uy)-0.5*(T_A*T_B)(0,0)) |
a2f2f511 | 1401 | // |
1402 | ||
a2f2f511 | 1403 | // Initial radius |
710a8d90 | 1404 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
1405 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
1406 | const Double_t kprodTATBHalfMax = 0.5*fgWAlmondCurrent->Eval(0.,0.); | |
a2f2f511 | 1407 | // Radial steps |
65aa45f2 | 1408 | Double_t l = 0.; |
1409 | Double_t integral = 0.; | |
710a8d90 | 1410 | for (Int_t i = 0; i < knps; i++) { |
a2f2f511 | 1411 | // Transform into target frame |
710a8d90 | 1412 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1413 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1414 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1415 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
a2f2f511 | 1416 | // Radius in projectile frame |
710a8d90 | 1417 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1418 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
1419 | if(kprodTATB>kprodTATBHalfMax) integral += kDl; | |
a2f2f511 | 1420 | l += kDl; |
1421 | } // steps | |
65aa45f2 | 1422 | Double_t ell = integral; |
a2f2f511 | 1423 | return ell; |
a2f2f511 | 1424 | } else { |
65aa45f2 | 1425 | Error("CalculateLength","Wrong length definition setting: %d !\n",fEllDef); |
a2f2f511 | 1426 | return -1.; |
1427 | } | |
1428 | } | |
1429 | ||
83f67d08 | 1430 | void AliFastGlauber::GetLengthAndPhi(Double_t& ell,Double_t& phi,Double_t b) |
a2f2f511 | 1431 | { |
1432 | // | |
1433 | // Return length from random b, x0, y0, phi0 | |
83f67d08 | 1434 | // Return also phi0 |
a2f2f511 | 1435 | // |
1436 | Double_t x0,y0,phi0; | |
1437 | if(b<0.) GetRandomBHard(b); | |
1438 | GetRandomXY(x0,y0); | |
1439 | GetRandomPhi(phi0); | |
83f67d08 | 1440 | phi = phi0; |
a2f2f511 | 1441 | ell = CalculateLength(b,x0,y0,phi0); |
a2f2f511 | 1442 | return; |
1443 | } | |
1444 | ||
83f67d08 | 1445 | void AliFastGlauber::GetLength(Double_t& ell,Double_t b) |
a2f2f511 | 1446 | { |
1447 | // | |
83f67d08 | 1448 | // Return length from random b, x0, y0, phi0 |
a2f2f511 | 1449 | // |
83f67d08 | 1450 | Double_t phi; |
1451 | GetLengthAndPhi(ell,phi,b); | |
1452 | return; | |
1453 | } | |
1454 | ||
1455 | void AliFastGlauber::GetLengthsBackToBackAndPhi(Double_t& ell1,Double_t& ell2,Double_t &phi,Double_t b) | |
1456 | { | |
1457 | // | |
1458 | // Return 2 lengths back to back from random b, x0, y0, phi0 | |
1459 | // Return also phi0 | |
1460 | // | |
a2f2f511 | 1461 | Double_t x0,y0,phi0; |
1462 | if(b<0.) GetRandomBHard(b); | |
1463 | GetRandomXY(x0,y0); | |
1464 | GetRandomPhi(phi0); | |
710a8d90 | 1465 | const Double_t kphi0plusPi = phi0+TMath::Pi(); |
83f67d08 | 1466 | phi = phi0; |
a2f2f511 | 1467 | ell1 = CalculateLength(b,x0,y0,phi0); |
710a8d90 | 1468 | ell2 = CalculateLength(b,x0,y0,kphi0plusPi); |
a2f2f511 | 1469 | return; |
1470 | } | |
1471 | ||
83f67d08 | 1472 | void AliFastGlauber::GetLengthsBackToBack(Double_t& ell1,Double_t& ell2, |
1473 | Double_t b) | |
1474 | { | |
1475 | // | |
1476 | // Return 2 lengths back to back from random b, x0, y0, phi0 | |
1477 | // | |
1478 | Double_t phi; | |
1479 | GetLengthsBackToBackAndPhi(ell1,ell2,phi,b); | |
1480 | return; | |
1481 | } | |
1482 | ||
620294e8 | 1483 | void AliFastGlauber::GetLengthsForPythia(Int_t n,Double_t* const phi,Double_t* ell, Double_t b) |
a2f2f511 | 1484 | { |
1485 | // | |
1486 | // Returns lenghts for n partons with azimuthal angles phi[n] | |
1487 | // from random b, x0, y0 | |
1488 | // | |
1bc228f5 | 1489 | Double_t x0, y0; |
1490 | if(b < 0.) GetRandomBHard(b); | |
a2f2f511 | 1491 | GetRandomXY(x0,y0); |
1bc228f5 | 1492 | for(Int_t i = 0; i< n; i++) ell[i] = CalculateLength(b,x0,y0,phi[i]); |
a2f2f511 | 1493 | return; |
1494 | } | |
1495 | ||
1496 | void AliFastGlauber::PlotBDistr(Int_t n) | |
65aa45f2 | 1497 | { |
a2f2f511 | 1498 | // |
1499 | // Plot distribution of n impact parameters | |
1500 | // | |
1501 | Double_t b; | |
1502 | TH1F *hB = new TH1F("hB","dN/db",100,0,fgBMax); | |
1503 | hB->SetXTitle("b [fm]"); | |
1504 | hB->SetYTitle("dN/db [a.u.]"); | |
1505 | hB->SetFillColor(3); | |
a2f2f511 | 1506 | for(Int_t i=0; i<n; i++) { |
1507 | GetRandomBHard(b); | |
1508 | hB->Fill(b); | |
1509 | } | |
a2f2f511 | 1510 | TCanvas *cB = new TCanvas("cB","Impact parameter distribution",0,0,500,500); |
1511 | cB->cd(); | |
1512 | hB->Draw(); | |
a2f2f511 | 1513 | return; |
1514 | } | |
1515 | ||
d3d4a92f | 1516 | void AliFastGlauber::PlotLengthDistr(Int_t n,Bool_t save,const char *fname) |
a2f2f511 | 1517 | { |
1518 | // | |
1519 | // Plot length distribution | |
1520 | // | |
1521 | Double_t ell; | |
710a8d90 | 1522 | TH1F *hEll = new TH1F("hEll","Length distribution",64,-0.5,15); |
a2f2f511 | 1523 | hEll->SetXTitle("Transverse path length, L [fm]"); |
1524 | hEll->SetYTitle("Probability"); | |
1525 | hEll->SetFillColor(2); | |
a2f2f511 | 1526 | for(Int_t i=0; i<n; i++) { |
1527 | GetLength(ell); | |
1528 | hEll->Fill(ell); | |
1529 | } | |
1530 | hEll->Scale(1/(Double_t)n); | |
a2f2f511 | 1531 | TCanvas *cL = new TCanvas("cL","Length distribution",0,0,500,500); |
1532 | cL->cd(); | |
1533 | hEll->Draw(); | |
1534 | ||
1535 | if(save) { | |
1536 | TFile *f = new TFile(fname,"recreate"); | |
1537 | hEll->Write(); | |
1538 | f->Close(); | |
1539 | } | |
1540 | return; | |
1541 | } | |
1542 | ||
d3d4a92f | 1543 | void AliFastGlauber::PlotLengthB2BDistr(Int_t n,Bool_t save,const char *fname) |
a2f2f511 | 1544 | { |
1545 | // | |
1546 | // Plot lengths back-to-back distributions | |
1547 | // | |
1548 | Double_t ell1,ell2; | |
1549 | TH2F *hElls = new TH2F("hElls","Lengths back-to-back",100,0,15,100,0,15); | |
1550 | hElls->SetXTitle("Transverse path length, L [fm]"); | |
1551 | hElls->SetYTitle("Transverse path length, L [fm]"); | |
a2f2f511 | 1552 | for(Int_t i=0; i<n; i++) { |
1553 | GetLengthsBackToBack(ell1,ell2); | |
1554 | hElls->Fill(ell1,ell2); | |
1555 | } | |
1556 | hElls->Scale(1/(Double_t)n); | |
a2f2f511 | 1557 | TCanvas *cLs = new TCanvas("cLs","Length back-to-back distribution",0,0,500,500); |
1558 | gStyle->SetPalette(1,0); | |
1559 | cLs->cd(); | |
1560 | hElls->Draw("col,Z"); | |
a2f2f511 | 1561 | if(save) { |
1562 | TFile *f = new TFile(fname,"recreate"); | |
1563 | hElls->Write(); | |
1564 | f->Close(); | |
1565 | } | |
1566 | return; | |
1567 | } | |
1568 | ||
710a8d90 | 1569 | void AliFastGlauber::PlotAlmonds() const |
1570 | { | |
1571 | // | |
1572 | // Plot almonds for some impact parameters | |
1573 | // | |
1574 | TCanvas *c = new TCanvas("c","Almonds",0,0,500,500); | |
1575 | gStyle->SetPalette(1,0); | |
1576 | c->Divide(2,2); | |
1577 | c->cd(1); | |
7f2f270b | 1578 | fgWAlmondFixedB[0]->Draw("cont1"); |
710a8d90 | 1579 | c->cd(2); |
7f2f270b | 1580 | fgWAlmondFixedB[10]->Draw("cont1"); |
710a8d90 | 1581 | c->cd(3); |
7f2f270b | 1582 | fgWAlmondFixedB[20]->Draw("cont1"); |
710a8d90 | 1583 | c->cd(4); |
7f2f270b | 1584 | fgWAlmondFixedB[30]->Draw("cont1"); |
710a8d90 | 1585 | return; |
1586 | } | |
1587 | ||
65aa45f2 | 1588 | //=================== Added by A. Dainese 05/03/04 =========================== |
1589 | ||
1590 | void AliFastGlauber::CalculateI0I1(Double_t& integral0,Double_t& integral1, | |
1591 | Double_t b,Double_t x0,Double_t y0, | |
710a8d90 | 1592 | Double_t phi0,Double_t ellCut) const |
a2f2f511 | 1593 | { |
65aa45f2 | 1594 | // |
1595 | // Calculate integrals: | |
e9663638 | 1596 | // integral0 = \int_0^ellCut dl*(T_A*T_B)(x0+l*ux,y0+l*uy) |
1597 | // integral1 = \int_0^ellCut dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
a2f2f511 | 1598 | // |
65aa45f2 | 1599 | // for a parton with production point (x0,y0) |
1600 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
1601 | // in a collision with impact parameter b | |
1602 | // | |
1603 | ||
1604 | // number of steps in l | |
1605 | const Int_t kNp = 100; | |
1606 | const Double_t kDl = fgBMax/Double_t(kNp); | |
1607 | ||
1608 | // Initial radius | |
710a8d90 | 1609 | const Double_t kr0 = TMath::Sqrt(x0 * x0 + y0 * y0); |
1610 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
65aa45f2 | 1611 | |
1612 | // Radial steps | |
1613 | Double_t l = 0.; | |
1614 | integral0 = 0.; | |
1615 | integral1 = 0.; | |
1616 | Int_t i = 0; | |
710a8d90 | 1617 | while((i < knps) && (l < ellCut)) { |
65aa45f2 | 1618 | // Transform into target frame |
710a8d90 | 1619 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1620 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1621 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1622 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 1623 | // Radius in projectile frame |
710a8d90 | 1624 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1625 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
1626 | integral0 += kprodTATB * kDl; | |
1627 | integral1 += kprodTATB * l * kDl; | |
65aa45f2 | 1628 | l += kDl; |
1629 | i++; | |
1630 | } // steps | |
1631 | return; | |
1632 | } | |
1633 | ||
83f67d08 | 1634 | void AliFastGlauber::GetI0I1AndPhi(Double_t& integral0,Double_t& integral1, |
1635 | Double_t& phi, | |
1636 | Double_t ellCut,Double_t b) | |
65aa45f2 | 1637 | { |
a2f2f511 | 1638 | // |
65aa45f2 | 1639 | // Return I0 and I1 from random b, x0, y0, phi0 |
83f67d08 | 1640 | // Return also phi |
65aa45f2 | 1641 | // |
1642 | Double_t x0,y0,phi0; | |
1643 | if(b<0.) GetRandomBHard(b); | |
1644 | GetRandomXY(x0,y0); | |
1645 | GetRandomPhi(phi0); | |
83f67d08 | 1646 | phi = phi0; |
65aa45f2 | 1647 | CalculateI0I1(integral0,integral1,b,x0,y0,phi0,ellCut); |
1648 | return; | |
1649 | } | |
a2f2f511 | 1650 | |
83f67d08 | 1651 | void AliFastGlauber::GetI0I1(Double_t& integral0,Double_t& integral1, |
1652 | Double_t ellCut,Double_t b) | |
1653 | { | |
1654 | // | |
1655 | // Return I0 and I1 from random b, x0, y0, phi0 | |
1656 | // | |
1657 | Double_t phi; | |
1658 | GetI0I1AndPhi(integral0,integral1,phi,ellCut,b); | |
1659 | return; | |
1660 | } | |
1661 | ||
1662 | void AliFastGlauber::GetI0I1BackToBackAndPhi(Double_t& integral01,Double_t& integral11, | |
1663 | Double_t& integral02,Double_t& integral12, | |
1664 | Double_t& phi, | |
1665 | Double_t ellCut,Double_t b) | |
65aa45f2 | 1666 | { |
1667 | // | |
1668 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
83f67d08 | 1669 | // Return also phi0 |
65aa45f2 | 1670 | // |
1671 | Double_t x0,y0,phi0; | |
1672 | if(b<0.) GetRandomBHard(b); | |
1673 | GetRandomXY(x0,y0); | |
1674 | GetRandomPhi(phi0); | |
83f67d08 | 1675 | phi = phi0; |
710a8d90 | 1676 | const Double_t kphi0plusPi = phi0+TMath::Pi(); |
c54404bf | 1677 | CalculateI0I1(integral01,integral11,b,x0,y0,phi0,ellCut); |
1678 | CalculateI0I1(integral02,integral12,b,x0,y0,kphi0plusPi,ellCut); | |
1679 | return; | |
1680 | } | |
1681 | ||
1682 | void AliFastGlauber::GetI0I1BackToBackAndPhiAndXY(Double_t& integral01,Double_t& integral11, | |
1683 | Double_t& integral02,Double_t& integral12, | |
1684 | Double_t& phi,Double_t &x,Double_t &y, | |
1685 | Double_t ellCut,Double_t b) | |
1686 | { | |
1687 | // | |
1688 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
1689 | // Return also phi0 | |
1690 | // | |
1691 | Double_t x0,y0,phi0; | |
1692 | if(b<0.) GetRandomBHard(b); | |
1693 | GetRandomXY(x0,y0); | |
1694 | GetRandomPhi(phi0); | |
1695 | phi = phi0; x=x0; y=y0; | |
1696 | const Double_t kphi0plusPi = phi0+TMath::Pi(); | |
65aa45f2 | 1697 | CalculateI0I1(integral01,integral11,b,x0,y0,phi0,ellCut); |
710a8d90 | 1698 | CalculateI0I1(integral02,integral12,b,x0,y0,kphi0plusPi,ellCut); |
65aa45f2 | 1699 | return; |
1700 | } | |
a2f2f511 | 1701 | |
83f67d08 | 1702 | void AliFastGlauber::GetI0I1BackToBack(Double_t& integral01,Double_t& integral11, |
1703 | Double_t& integral02,Double_t& integral12, | |
1704 | Double_t ellCut,Double_t b) | |
1705 | { | |
1706 | // | |
1707 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
1708 | // | |
1709 | Double_t phi; | |
1710 | GetI0I1BackToBackAndPhi(integral01,integral11,integral02,integral12, | |
1711 | phi,ellCut,b); | |
1712 | return; | |
1713 | } | |
1714 | ||
65aa45f2 | 1715 | void AliFastGlauber::GetI0I1ForPythia(Int_t n,Double_t* phi, |
1716 | Double_t* integral0,Double_t* integral1, | |
1717 | Double_t ellCut,Double_t b) | |
1718 | { | |
1719 | // | |
1720 | // Returns I0 and I1 pairs for n partons with azimuthal angles phi[n] | |
1721 | // from random b, x0, y0 | |
1722 | // | |
1723 | Double_t x0,y0; | |
1724 | if(b<0.) GetRandomBHard(b); | |
1725 | GetRandomXY(x0,y0); | |
1726 | for(Int_t i=0; i<n; i++) | |
1727 | CalculateI0I1(integral0[i],integral1[i],b,x0,y0,phi[i],ellCut); | |
1728 | return; | |
1729 | } | |
1730 | ||
2e3b5c95 | 1731 | void AliFastGlauber::GetI0I1ForPythiaAndXY(Int_t n,Double_t* phi, |
1732 | Double_t* integral0,Double_t* integral1, | |
1733 | Double_t &x,Double_t& y, | |
1734 | Double_t ellCut,Double_t b) | |
1735 | { | |
1736 | // | |
1737 | // Returns I0 and I1 pairs for n partons with azimuthal angles phi[n] | |
1738 | // from random b, x0, y0 and return x0,y0 | |
1739 | // | |
1740 | Double_t x0,y0; | |
1741 | if(b<0.) GetRandomBHard(b); | |
1742 | GetRandomXY(x0,y0); | |
1743 | for(Int_t i=0; i<n; i++) | |
1744 | CalculateI0I1(integral0[i],integral1[i],b,x0,y0,phi[i],ellCut); | |
1745 | x=x0; | |
1746 | y=y0; | |
1747 | return; | |
1748 | } | |
1749 | ||
65aa45f2 | 1750 | void AliFastGlauber::PlotI0I1Distr(Int_t n,Double_t ellCut, |
d3d4a92f | 1751 | Bool_t save,const char *fname) |
65aa45f2 | 1752 | { |
1753 | // | |
bbf8513d | 1754 | // Plot I0-I1 distribution |
65aa45f2 | 1755 | // |
1756 | Double_t i0,i1; | |
bbf8513d | 1757 | TH2F *hI0I1s = new TH2F("hI0I1s","I_{0} versus I_{1}",1000,0,0.001,1000,0,0.01); |
1758 | hI0I1s->SetXTitle("I_{0} [fm^{-3}]"); | |
1759 | hI0I1s->SetYTitle("I_{1} [fm^{-2}]"); | |
1760 | ||
65aa45f2 | 1761 | TH1F *hI0 = new TH1F("hI0","I_{0} = #hat{q}L / k", |
bbf8513d | 1762 | 1000,0,0.001); |
65aa45f2 | 1763 | hI0->SetXTitle("I_{0} [fm^{-3}]"); |
1764 | hI0->SetYTitle("Probability"); | |
1765 | hI0->SetFillColor(3); | |
1766 | TH1F *hI1 = new TH1F("hI1","I_{1} = #omega_{c} / k", | |
bbf8513d | 1767 | 1000,0,0.01); |
65aa45f2 | 1768 | hI1->SetXTitle("I_{1} [fm^{-2}]"); |
1769 | hI1->SetYTitle("Probability"); | |
1770 | hI1->SetFillColor(4); | |
1771 | TH1F *h2 = new TH1F("h2","2 I_{1}^{2}/I_{0} = R / k", | |
1772 | 100,0,0.02); | |
1773 | h2->SetXTitle("2 I_{1}^{2}/I_{0} [fm^{-1}]"); | |
1774 | h2->SetYTitle("Probability"); | |
1775 | h2->SetFillColor(2); | |
1776 | TH1F *h3 = new TH1F("h3","2 I_{1}/I_{0} = L", | |
1777 | 100,0,15); | |
1778 | h3->SetXTitle("2 I_{1}/I_{0} [fm]"); | |
1779 | h3->SetYTitle("Probability"); | |
1780 | h3->SetFillColor(5); | |
1781 | TH1F *h4 = new TH1F("h4","I_{0}^{2}/(2 I_{1}) = #hat{q} / k", | |
1782 | 100,0,0.00015); | |
1783 | h4->SetXTitle("I_{0}^{2}/(2 I_{1}) [fm^{-4}]"); | |
1784 | h4->SetYTitle("Probability"); | |
1785 | h4->SetFillColor(7); | |
1786 | ||
1787 | for(Int_t i=0; i<n; i++) { | |
1788 | GetI0I1(i0,i1,ellCut); | |
bbf8513d | 1789 | hI0I1s->Fill(i0,i1); |
65aa45f2 | 1790 | hI0->Fill(i0); |
1791 | hI1->Fill(i1); | |
1792 | h2->Fill(2.*i1*i1/i0); | |
1793 | h3->Fill(2.*i1/i0); | |
1794 | h4->Fill(i0*i0/2./i1); | |
a2f2f511 | 1795 | } |
65aa45f2 | 1796 | hI0->Scale(1/(Double_t)n); |
1797 | hI1->Scale(1/(Double_t)n); | |
bbf8513d | 1798 | h2->Scale(1/(Double_t)n); |
1799 | h3->Scale(1/(Double_t)n); | |
1800 | h4->Scale(1/(Double_t)n); | |
1801 | hI0I1s->Scale(1/(Double_t)n); | |
65aa45f2 | 1802 | |
1803 | TCanvas *cI0I1 = new TCanvas("cI0I1","I0 and I1",0,0,900,700); | |
1804 | cI0I1->Divide(3,2); | |
1805 | cI0I1->cd(1); | |
1806 | hI0->Draw(); | |
1807 | cI0I1->cd(2); | |
1808 | hI1->Draw(); | |
1809 | cI0I1->cd(3); | |
1810 | h2->Draw(); | |
1811 | cI0I1->cd(4); | |
1812 | h3->Draw(); | |
1813 | cI0I1->cd(5); | |
1814 | h4->Draw(); | |
bbf8513d | 1815 | cI0I1->cd(6); |
1816 | gStyle->SetPalette(1,0); | |
1817 | hI0I1s->Draw("col,Z"); | |
a2f2f511 | 1818 | |
65aa45f2 | 1819 | if(save) { |
1820 | TFile *f = new TFile(fname,"recreate"); | |
bbf8513d | 1821 | hI0I1s->Write(); |
65aa45f2 | 1822 | hI0->Write(); |
1823 | hI1->Write(); | |
1824 | h2->Write(); | |
1825 | h3->Write(); | |
1826 | h4->Write(); | |
1827 | f->Close(); | |
1828 | } | |
a2f2f511 | 1829 | return; |
1830 | } | |
1831 | ||
65aa45f2 | 1832 | void AliFastGlauber::PlotI0I1B2BDistr(Int_t n,Double_t ellCut, |
d3d4a92f | 1833 | Bool_t save,const char *fname) |
a2f2f511 | 1834 | { |
1835 | // | |
bbf8513d | 1836 | // Plot I0-I1 back-to-back distributions |
a2f2f511 | 1837 | // |
65aa45f2 | 1838 | Double_t i01,i11,i02,i12; |
1839 | TH2F *hI0s = new TH2F("hI0s","I_{0}'s back-to-back",100,0,100,100,0,100); | |
1840 | hI0s->SetXTitle("I_{0} [fm^{-3}]"); | |
1841 | hI0s->SetYTitle("I_{0} [fm^{-3}]"); | |
1842 | TH2F *hI1s = new TH2F("hI1s","I_{1}'s back-to-back",100,0,100,100,0,100); | |
1843 | hI1s->SetXTitle("I_{1} [fm^{-2}]"); | |
1844 | hI1s->SetYTitle("I_{1} [fm^{-2}]"); | |
a2f2f511 | 1845 | |
65aa45f2 | 1846 | for(Int_t i=0; i<n; i++) { |
1847 | GetI0I1BackToBack(i01,i11,i02,i12,ellCut); | |
1848 | hI0s->Fill(i01,i02); | |
1849 | hI1s->Fill(i11,i12); | |
1850 | } | |
1851 | hI0s->Scale(1/(Double_t)n); | |
1852 | hI1s->Scale(1/(Double_t)n); | |
1853 | ||
1854 | TCanvas *cI0I1s = new TCanvas("cI0I1s","I0 and I1 back-to-back distributions",0,0,800,400); | |
a2f2f511 | 1855 | gStyle->SetPalette(1,0); |
65aa45f2 | 1856 | cI0I1s->Divide(2,1); |
1857 | cI0I1s->cd(1); | |
1858 | hI0s->Draw("col,Z"); | |
1859 | cI0I1s->cd(2); | |
1860 | hI1s->Draw("col,Z"); | |
a2f2f511 | 1861 | |
65aa45f2 | 1862 | if(save) { |
1863 | TFile *f = new TFile(fname,"recreate"); | |
1864 | hI0s->Write(); | |
1865 | hI1s->Write(); | |
1866 | f->Close(); | |
1867 | } | |
a2f2f511 | 1868 | return; |
1869 | } | |
710a8d90 | 1870 | |
a42548b0 | 1871 | AliFastGlauber& AliFastGlauber::operator=(const AliFastGlauber& rhs) |
1872 | { | |
1873 | // Assignment operator | |
1874 | rhs.Copy(*this); | |
1875 | return *this; | |
1876 | } | |
1877 | ||
1878 | void AliFastGlauber::Copy(TObject&) const | |
1879 | { | |
1880 | // | |
1881 | // Copy | |
1882 | // | |
1883 | Fatal("Copy","Not implemented!\n"); | |
1884 | } | |
1885 |