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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 <Riostream.h> |
54 | #include <TCanvas.h> | |
5b3a5a5d | 55 | #include <TF1.h> |
56 | #include <TF2.h> | |
5b3a5a5d | 57 | #include <TFile.h> |
9edefa04 | 58 | #include <TH1F.h> |
59 | #include <TH2F.h> | |
60 | #include <TLegend.h> | |
61 | #include <TMath.h> | |
65aa45f2 | 62 | #include <TROOT.h> |
9edefa04 | 63 | #include <TRandom.h> |
64 | #include <TStyle.h> | |
5b3a5a5d | 65 | |
66 | ClassImp(AliFastGlauber) | |
67 | ||
65aa45f2 | 68 | Float_t AliFastGlauber::fgBMax = 0.; |
041f7f97 | 69 | TF1* AliFastGlauber::fgWSb = NULL; |
70 | TF2* AliFastGlauber::fgWSbz = NULL; | |
71 | TF1* AliFastGlauber::fgWSz = NULL; | |
72 | TF1* AliFastGlauber::fgWSta = NULL; | |
73 | TF2* AliFastGlauber::fgWStarfi = NULL; | |
74 | TF2* AliFastGlauber::fgWAlmond = NULL; | |
75 | TF1* AliFastGlauber::fgWStaa = NULL; | |
76 | TF1* AliFastGlauber::fgWSgeo = NULL; | |
77 | TF1* AliFastGlauber::fgWSbinary = NULL; | |
78 | TF1* AliFastGlauber::fgWSN = NULL; | |
79 | TF1* AliFastGlauber::fgWPathLength0 = NULL; | |
80 | TF1* AliFastGlauber::fgWPathLength = NULL; | |
81 | TF1* AliFastGlauber::fgWEnergyDensity = NULL; | |
82 | TF1* AliFastGlauber::fgWIntRadius = NULL; | |
1bc228f5 | 83 | TF2* AliFastGlauber::fgWKParticipants = NULL; |
84 | TF1* AliFastGlauber::fgWParticipants = NULL; | |
65aa45f2 | 85 | TF2* AliFastGlauber::fgWAlmondCurrent = NULL; |
7f2f270b | 86 | TF2* AliFastGlauber::fgWAlmondFixedB[40]; |
65aa45f2 | 87 | const Int_t AliFastGlauber::fgkMCInts = 100000; |
18b7a4a1 | 88 | AliFastGlauber* AliFastGlauber::fgGlauber = NULL; |
89 | ||
5b3a5a5d | 90 | |
e6e76983 | 91 | AliFastGlauber::AliFastGlauber(): |
92 | fWSr0(0.), | |
93 | fWSd(0.), | |
94 | fWSw(0.), | |
95 | fWSn(0.), | |
96 | fSigmaHard(0.), | |
97 | fSigmaNN(0.), | |
98 | fA(0), | |
99 | fBmin(0.), | |
100 | fBmax(0.), | |
101 | fEllDef(0), | |
102 | fName() | |
5b3a5a5d | 103 | { |
a42548b0 | 104 | // Default Constructor |
65aa45f2 | 105 | // Defaults for Pb |
106 | SetMaxImpact(); | |
107 | SetLengthDefinition(); | |
108 | SetPbPbLHC(); | |
109 | } | |
110 | ||
a42548b0 | 111 | AliFastGlauber::AliFastGlauber(const AliFastGlauber & gl) |
e6e76983 | 112 | :TObject(gl), |
113 | fWSr0(0.), | |
114 | fWSd(0.), | |
115 | fWSw(0.), | |
116 | fWSn(0.), | |
117 | fSigmaHard(0.), | |
118 | fSigmaNN(0.), | |
119 | fA(0), | |
120 | fBmin(0.), | |
121 | fBmax(0.), | |
122 | fEllDef(0), | |
123 | fName() | |
a42548b0 | 124 | { |
125 | // Copy constructor | |
126 | gl.Copy(*this); | |
127 | } | |
128 | ||
18b7a4a1 | 129 | AliFastGlauber* AliFastGlauber::Instance() |
130 | { | |
131 | // Set random number generator | |
132 | if (fgGlauber) { | |
133 | return fgGlauber; | |
134 | } else { | |
135 | fgGlauber = new AliFastGlauber(); | |
136 | return fgGlauber; | |
137 | } | |
138 | } | |
139 | ||
65aa45f2 | 140 | AliFastGlauber::~AliFastGlauber() |
141 | { | |
a42548b0 | 142 | // Destructor |
7f2f270b | 143 | for(Int_t k=0; k<40; k++) delete fgWAlmondFixedB[k]; |
65aa45f2 | 144 | } |
145 | ||
146 | void AliFastGlauber::SetAuAuRhic() | |
147 | { | |
148 | //Set all parameters for RHIC | |
149 | SetWoodSaxonParametersAu(); | |
150 | SetHardCrossSection(); | |
710a8d90 | 151 | SetNNCrossSection(42); |
65aa45f2 | 152 | SetNucleus(197); |
153 | SetFileName("$(ALICE_ROOT)/FASTSIM/data/glauberAuAu.root"); | |
154 | } | |
155 | ||
156 | void AliFastGlauber::SetPbPbLHC() | |
157 | { | |
158 | //Set all parameters for LHC | |
159 | SetWoodSaxonParametersPb(); | |
160 | SetHardCrossSection(); | |
161 | SetNNCrossSection(); | |
162 | SetNucleus(); | |
163 | SetFileName(); | |
5b3a5a5d | 164 | } |
165 | ||
166 | void AliFastGlauber::Init(Int_t mode) | |
167 | { | |
65aa45f2 | 168 | // Initialisation |
169 | // mode = 0; all functions are calculated | |
170 | // mode = 1; overlap function is read from file (for Pb-Pb only) | |
171 | // mode = 2; interaction almond functions are read from file | |
172 | // USE THIS FOR PATH LENGTH CALC.! | |
173 | // | |
a2f2f511 | 174 | |
65aa45f2 | 175 | // |
176 | Reset(); | |
177 | // | |
5b3a5a5d | 178 | |
65aa45f2 | 179 | // |
180 | // Wood-Saxon | |
181 | // | |
182 | fgWSb = new TF1("WSb", WSb, 0, fgBMax, 4); | |
183 | fgWSb->SetParameter(0, fWSr0); | |
184 | fgWSb->SetParameter(1, fWSd); | |
185 | fgWSb->SetParameter(2, fWSw); | |
186 | fgWSb->SetParameter(3, fWSn); | |
187 | ||
fac5662b | 188 | fgWSbz = new TF2("WSbz", WSbz, 0, fgBMax, 0, fgBMax, 4); |
65aa45f2 | 189 | fgWSbz->SetParameter(0, fWSr0); |
190 | fgWSbz->SetParameter(1, fWSd); | |
191 | fgWSbz->SetParameter(2, fWSw); | |
192 | fgWSbz->SetParameter(3, fWSn); | |
193 | ||
194 | fgWSz = new TF1("WSz", WSz, 0, fgBMax, 5); | |
195 | fgWSz->SetParameter(0, fWSr0); | |
196 | fgWSz->SetParameter(1, fWSd); | |
197 | fgWSz->SetParameter(2, fWSw); | |
198 | fgWSz->SetParameter(3, fWSn); | |
199 | ||
200 | // | |
201 | // Thickness | |
202 | // | |
203 | fgWSta = new TF1("WSta", WSta, 0., fgBMax, 0); | |
5b3a5a5d | 204 | |
65aa45f2 | 205 | // |
206 | // Overlap Kernel | |
207 | // | |
208 | fgWStarfi = new TF2("WStarfi", WStarfi, 0., fgBMax, 0., TMath::Pi(), 1); | |
209 | fgWStarfi->SetParameter(0, 0.); | |
210 | fgWStarfi->SetNpx(200); | |
211 | fgWStarfi->SetNpy(20); | |
8de7e046 | 212 | |
65aa45f2 | 213 | // |
214 | // Participants Kernel | |
215 | // | |
216 | fgWKParticipants = new TF2("WKParticipants", WKParticipants, 0., fgBMax, 0., TMath::Pi(), 3); | |
217 | fgWKParticipants->SetParameter(0, 0.); | |
218 | fgWKParticipants->SetParameter(1, fSigmaNN); | |
219 | fgWKParticipants->SetParameter(2, fA); | |
220 | fgWKParticipants->SetNpx(200); | |
221 | fgWKParticipants->SetNpy(20); | |
f3a04204 | 222 | |
65aa45f2 | 223 | // |
224 | // Overlap and Participants | |
225 | // | |
226 | if (!mode) { | |
227 | fgWStaa = new TF1("WStaa", WStaa, 0., fgBMax, 1); | |
228 | fgWStaa->SetNpx(100); | |
229 | fgWStaa->SetParameter(0,fA); | |
230 | fgWStaa->SetNpx(100); | |
231 | fgWParticipants = new TF1("WParticipants", WParticipants, 0., fgBMax, 2); | |
232 | fgWParticipants->SetParameter(0, fSigmaNN); | |
233 | fgWParticipants->SetParameter(1, fA); | |
234 | fgWParticipants->SetNpx(100); | |
235 | } else { | |
236 | Info("Init","Reading overlap function from file %s",fName.Data()); | |
237 | TFile* f = new TFile(fName.Data()); | |
238 | if(!f->IsOpen()){ | |
239 | Fatal("Init", "Could not open file %s",fName.Data()); | |
240 | } | |
241 | fgWStaa = (TF1*) f->Get("WStaa"); | |
242 | fgWParticipants = (TF1*) f->Get("WParticipants"); | |
243 | delete f; | |
244 | } | |
2a103154 | 245 | |
65aa45f2 | 246 | // |
247 | // Energy Density | |
248 | // | |
249 | fgWEnergyDensity = new TF1("WEnergyDensity", WEnergyDensity, 0., 2. * fWSr0, 1); | |
250 | fgWEnergyDensity->SetParameter(0, fWSr0 + 1.); | |
251 | ||
252 | // | |
253 | // Geometrical Cross-Section | |
254 | // | |
255 | fgWSgeo = new TF1("WSgeo", WSgeo, 0., fgBMax, 1); | |
256 | fgWSgeo->SetParameter(0,fSigmaNN); //mbarn | |
257 | fgWSgeo->SetNpx(100); | |
2a103154 | 258 | |
65aa45f2 | 259 | // |
260 | // Hard cross section (binary collisions) | |
261 | // | |
262 | fgWSbinary = new TF1("WSbinary", WSbinary, 0., fgBMax, 1); | |
263 | fgWSbinary->SetParameter(0, fSigmaHard); //mbarn | |
264 | fgWSbinary->SetNpx(100); | |
1bc228f5 | 265 | |
65aa45f2 | 266 | // |
267 | // Hard collisions per event | |
268 | // | |
269 | fgWSN = new TF1("WSN", WSN, 0., fgBMax, 1); | |
270 | fgWSN->SetNpx(100); | |
271 | ||
272 | // | |
273 | // Almond shaped interaction region | |
274 | // | |
275 | fgWAlmond = new TF2("WAlmond", WAlmond, -fgBMax, fgBMax, -fgBMax, fgBMax, 1); | |
276 | fgWAlmond->SetParameter(0, 0.); | |
277 | fgWAlmond->SetNpx(200); | |
278 | fgWAlmond->SetNpy(200); | |
279 | ||
280 | if(mode==2) { | |
281 | Info("Init","Reading interaction almonds from file: %s",fName.Data()); | |
282 | Char_t almondName[100]; | |
283 | TFile* ff = new TFile(fName.Data()); | |
284 | for(Int_t k=0; k<40; k++) { | |
285 | sprintf(almondName,"WAlmondFixedB%d",k); | |
286 | fgWAlmondCurrent = (TF2*)ff->Get(almondName); | |
7f2f270b | 287 | fgWAlmondFixedB[k] = fgWAlmondCurrent; |
5b3a5a5d | 288 | } |
65aa45f2 | 289 | delete ff; |
290 | } | |
291 | ||
292 | fgWIntRadius = new TF1("WIntRadius", WIntRadius, 0., fgBMax, 1); | |
293 | fgWIntRadius->SetParameter(0, 0.); | |
294 | ||
295 | // | |
296 | // Path Length as a function of Phi | |
297 | // | |
298 | fgWPathLength0 = new TF1("WPathLength0", WPathLength0, -TMath::Pi(), TMath::Pi(), 2); | |
299 | fgWPathLength0->SetParameter(0, 0.); | |
300 | fgWPathLength0->SetParameter(1, 0.); //Pathlength definition | |
301 | ||
302 | fgWPathLength = new TF1("WPathLength", WPathLength, -TMath::Pi(), TMath::Pi(), 3); | |
303 | fgWPathLength->SetParameter(0, 0.); //Impact Parameter | |
304 | fgWPathLength->SetParameter(1, 1000.); //Number of interactions used for average | |
305 | fgWPathLength->SetParameter(2, 0); //Pathlength definition | |
306 | } | |
307 | ||
a42548b0 | 308 | void AliFastGlauber::Reset() const |
65aa45f2 | 309 | { |
310 | // | |
311 | // Reset dynamic allocated formulas | |
312 | // in case init is called twice | |
313 | ||
314 | if(fgWSb) delete fgWSb; | |
315 | if(fgWSbz) delete fgWSbz; | |
316 | if(fgWSz) delete fgWSz; | |
317 | if(fgWSta) delete fgWSta; | |
318 | if(fgWStarfi) delete fgWStarfi; | |
319 | if(fgWAlmond) delete fgWAlmond; | |
320 | if(fgWStaa) delete fgWStaa; | |
321 | if(fgWSgeo) delete fgWSgeo; | |
322 | if(fgWSbinary) delete fgWSbinary; | |
323 | if(fgWSN) delete fgWSN; | |
324 | if(fgWPathLength0) delete fgWPathLength0; | |
325 | if(fgWPathLength) delete fgWPathLength; | |
326 | if(fgWEnergyDensity) delete fgWEnergyDensity; | |
327 | if(fgWIntRadius) delete fgWIntRadius; | |
328 | if(fgWKParticipants) delete fgWKParticipants; | |
329 | if(fgWParticipants) delete fgWParticipants; | |
5b3a5a5d | 330 | } |
331 | ||
710a8d90 | 332 | void AliFastGlauber::DrawWSb() const |
5b3a5a5d | 333 | { |
65aa45f2 | 334 | // |
335 | // Draw Wood-Saxon Nuclear Density Function | |
336 | // | |
337 | TCanvas *c1 = new TCanvas("c1","Wood Saxon",400,10,600,700); | |
338 | c1->cd(); | |
339 | Double_t max=fgWSb->GetMaximum(0,fgBMax)*1.01; | |
340 | 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); | |
341 | h2f->SetStats(0); | |
342 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
343 | h2f->GetYaxis()->SetNoExponent(kTRUE); | |
344 | h2f->GetYaxis()->SetTitle("#rho [fm^{-3}]"); | |
345 | h2f->Draw(); | |
346 | fgWSb->Draw("same"); | |
347 | TLegend *l1a = new TLegend(0.45,0.6,.90,0.8); | |
348 | l1a->SetFillStyle(0); | |
349 | l1a->SetBorderSize(0); | |
350 | Char_t label[100]; | |
351 | sprintf(label,"r_{0} = %.2f fm",fWSr0); | |
352 | l1a->AddEntry(fgWSb,label,""); | |
353 | sprintf(label,"d = %.2f fm",fWSd); | |
354 | l1a->AddEntry(fgWSb,label,""); | |
355 | sprintf(label,"n = %.2e fm^{-3}",fWSn); | |
356 | l1a->AddEntry(fgWSb,label,""); | |
357 | sprintf(label,"#omega = %.2f",fWSw); | |
358 | l1a->AddEntry(fgWSb,label,""); | |
359 | l1a->Draw(); | |
360 | c1->Update(); | |
5b3a5a5d | 361 | } |
362 | ||
710a8d90 | 363 | void AliFastGlauber::DrawOverlap() const |
5b3a5a5d | 364 | { |
65aa45f2 | 365 | // |
366 | // Draw Overlap Function | |
367 | // | |
368 | TCanvas *c2 = new TCanvas("c2","Overlap",400,10,600,700); | |
369 | c2->cd(); | |
370 | Double_t max=fgWStaa->GetMaximum(0,fgBMax)*1.01; | |
a42548b0 | 371 | TH2F *h2f=new TH2F("h2ftaa","Overlap function: T_{AB} [mbarn^{-1}]",2,0,fgBMax,2,0, max); |
65aa45f2 | 372 | h2f->SetStats(0); |
373 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
374 | h2f->GetYaxis()->SetTitle("T_{AB} [mbarn^{-1}]"); | |
375 | h2f->Draw(); | |
376 | fgWStaa->Draw("same"); | |
5b3a5a5d | 377 | } |
378 | ||
710a8d90 | 379 | void AliFastGlauber::DrawParticipants() const |
1bc228f5 | 380 | { |
65aa45f2 | 381 | // |
382 | // Draw Number of Participants Npart | |
383 | // | |
384 | TCanvas *c3 = new TCanvas("c3","Participants",400,10,600,700); | |
385 | c3->cd(); | |
386 | Double_t max=fgWParticipants->GetMaximum(0,fgBMax)*1.01; | |
387 | TH2F *h2f=new TH2F("h2fpart","Number of Participants",2,0,fgBMax,2,0,max); | |
388 | h2f->SetStats(0); | |
389 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
390 | h2f->GetYaxis()->SetTitle("N_{part}"); | |
391 | h2f->Draw(); | |
392 | fgWParticipants->Draw("same"); | |
393 | TLegend *l1a = new TLegend(0.50,0.75,.90,0.9); | |
394 | l1a->SetFillStyle(0); | |
395 | l1a->SetBorderSize(0); | |
396 | Char_t label[100]; | |
397 | sprintf(label,"#sigma^{inel.}_{NN} = %.1f mbarn",fSigmaNN); | |
398 | l1a->AddEntry(fgWParticipants,label,""); | |
399 | l1a->Draw(); | |
400 | c3->Update(); | |
1bc228f5 | 401 | } |
402 | ||
710a8d90 | 403 | void AliFastGlauber::DrawThickness() const |
5b3a5a5d | 404 | { |
65aa45f2 | 405 | // |
406 | // Draw Thickness Function | |
407 | // | |
408 | TCanvas *c4 = new TCanvas("c4","Thickness",400,10,600,700); | |
409 | c4->cd(); | |
410 | Double_t max=fgWSta->GetMaximum(0,fgBMax)*1.01; | |
411 | TH2F *h2f=new TH2F("h2fta","Thickness function: T_{A} [fm^{-2}]",2,0,fgBMax,2,0,max); | |
412 | h2f->SetStats(0); | |
413 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
414 | h2f->GetYaxis()->SetTitle("T_{A} [fm^{-2}]"); | |
415 | h2f->Draw(); | |
416 | fgWSta->Draw("same"); | |
5b3a5a5d | 417 | } |
418 | ||
710a8d90 | 419 | void AliFastGlauber::DrawGeo() const |
5b3a5a5d | 420 | { |
65aa45f2 | 421 | // |
422 | // Draw Geometrical Cross-Section | |
423 | // | |
424 | TCanvas *c5 = new TCanvas("c5","Geometrical Cross-Section",400,10,600,700); | |
425 | c5->cd(); | |
426 | Double_t max=fgWSgeo->GetMaximum(0,fgBMax)*1.01; | |
427 | TH2F *h2f=new TH2F("h2fgeo","Differential Geometrical Cross-Section: d#sigma^{geo}_{AB}/db [fm]",2,0,fgBMax,2,0,max); | |
428 | h2f->SetStats(0); | |
429 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
430 | h2f->GetYaxis()->SetTitle("d#sigma^{geo}_{AB}/db [fm]"); | |
431 | h2f->Draw(); | |
432 | fgWSgeo->Draw("same"); | |
433 | TLegend *l1a = new TLegend(0.10,0.8,.40,0.9); | |
434 | l1a->SetFillStyle(0); | |
435 | l1a->SetBorderSize(0); | |
436 | Char_t label[100]; | |
437 | sprintf(label,"#sigma_{NN}^{inel.} = %.1f mbarn",fSigmaNN); | |
438 | l1a->AddEntry(fgWSgeo,label,""); | |
439 | l1a->Draw(); | |
440 | c5->Update(); | |
5b3a5a5d | 441 | } |
442 | ||
710a8d90 | 443 | void AliFastGlauber::DrawBinary() const |
5b3a5a5d | 444 | { |
65aa45f2 | 445 | // |
446 | // Draw Binary Cross-Section | |
447 | // | |
448 | TCanvas *c6 = new TCanvas("c6","Binary Cross-Section",400,10,600,700); | |
449 | c6->cd(); | |
450 | Double_t max=fgWSbinary->GetMaximum(0,fgBMax)*1.01; | |
451 | TH2F *h2f=new TH2F("h2fbinary","Differential Binary Cross-Section: #sigma^{hard}_{NN} dT_{AB}/db [fm]",2,0,fgBMax,2,0,max); | |
452 | h2f->SetStats(0); | |
453 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
454 | h2f->GetYaxis()->SetTitle("d#sigma^{hard}_{AB}/db [fm]"); | |
455 | h2f->Draw(); | |
456 | fgWSbinary->Draw("same"); | |
457 | TLegend *l1a = new TLegend(0.50,0.8,.90,0.9); | |
458 | l1a->SetFillStyle(0); | |
459 | l1a->SetBorderSize(0); | |
460 | Char_t label[100]; | |
461 | sprintf(label,"#sigma_{NN}^{hard} = %.1f mbarn",fSigmaHard); | |
462 | l1a->AddEntry(fgWSb,label,""); | |
463 | l1a->Draw(); | |
464 | c6->Update(); | |
5b3a5a5d | 465 | } |
466 | ||
710a8d90 | 467 | void AliFastGlauber::DrawN() const |
5b3a5a5d | 468 | { |
65aa45f2 | 469 | // |
470 | // Draw Binaries per event (Ncoll) | |
471 | // | |
472 | TCanvas *c7 = new TCanvas("c7","Binaries per event",400,10,600,700); | |
473 | c7->cd(); | |
474 | Double_t max=fgWSN->GetMaximum(0,fgBMax)*1.01; | |
475 | TH2F *h2f=new TH2F("h2fhardcols","Number of hard collisions: T_{AB} #sigma^{hard}_{NN}/#sigma_{AB}^{geo}",2,0,fgBMax,2,0,max); | |
476 | h2f->SetStats(0); | |
477 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
478 | h2f->GetYaxis()->SetTitle("N_{coll}"); | |
479 | h2f->Draw(); | |
480 | fgWSN->Draw("same"); | |
481 | TLegend *l1a = new TLegend(0.50,0.75,.90,0.9); | |
482 | l1a->SetFillStyle(0); | |
483 | l1a->SetBorderSize(0); | |
484 | Char_t label[100]; | |
485 | sprintf(label,"#sigma^{hard}_{NN} = %.1f mbarn",fSigmaHard); | |
486 | l1a->AddEntry(fgWSN,label,""); | |
487 | sprintf(label,"#sigma^{inel.}_{NN} = %.1f mbarn",fSigmaNN); | |
488 | l1a->AddEntry(fgWSN,label,""); | |
489 | l1a->Draw(); | |
490 | c7->Update(); | |
5b3a5a5d | 491 | } |
492 | ||
710a8d90 | 493 | void AliFastGlauber::DrawKernel(Double_t b) const |
5b3a5a5d | 494 | { |
65aa45f2 | 495 | // |
496 | // Draw Kernel | |
497 | // | |
498 | TCanvas *c8 = new TCanvas("c8","Kernel",400,10,600,700); | |
499 | c8->cd(); | |
500 | fgWStarfi->SetParameter(0, b); | |
501 | 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()); | |
502 | h2f->SetStats(0); | |
503 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
504 | h2f->GetYaxis()->SetTitle("#phi [rad]"); | |
505 | h2f->Draw(); | |
506 | fgWStarfi->Draw("same"); | |
507 | TLegend *l1a = new TLegend(0.65,0.8,.90,0.9); | |
508 | l1a->SetFillStyle(0); | |
509 | l1a->SetBorderSize(0); | |
510 | Char_t label[100]; | |
a0e187b1 | 511 | sprintf(label,"b = %.1f fm",b); |
65aa45f2 | 512 | l1a->AddEntry(fgWStarfi,label,""); |
513 | l1a->Draw(); | |
514 | c8->Update(); | |
5b3a5a5d | 515 | } |
516 | ||
710a8d90 | 517 | void AliFastGlauber::DrawAlmond(Double_t b) const |
f3a04204 | 518 | { |
65aa45f2 | 519 | // |
520 | // Draw Interaction Almond | |
521 | // | |
522 | TCanvas *c9 = new TCanvas("c9","Almond",400,10,600,700); | |
523 | c9->cd(); | |
524 | fgWAlmond->SetParameter(0, b); | |
525 | TH2F *h2f=new TH2F("h2falmond","Interaction Almond [fm^{-4}]",2,0,fgBMax,2,0,fgBMax); | |
526 | h2f->SetStats(0); | |
527 | h2f->GetXaxis()->SetTitle("x [fm]"); | |
528 | h2f->GetYaxis()->SetTitle("y [fm]"); | |
529 | h2f->Draw(); | |
530 | fgWAlmond->Draw("same"); | |
531 | TLegend *l1a = new TLegend(0.65,0.8,.90,0.9); | |
532 | l1a->SetFillStyle(0); | |
533 | l1a->SetBorderSize(0); | |
534 | Char_t label[100]; | |
a0e187b1 | 535 | sprintf(label,"b = %.1f fm",b); |
65aa45f2 | 536 | l1a->AddEntry(fgWAlmond,label,""); |
537 | l1a->Draw(); | |
538 | c9->Update(); | |
f3a04204 | 539 | } |
540 | ||
710a8d90 | 541 | void AliFastGlauber::DrawEnergyDensity() const |
f3a04204 | 542 | { |
65aa45f2 | 543 | // |
544 | // Draw energy density | |
545 | // | |
546 | TCanvas *c10 = new TCanvas("c10","Energy Density",400, 10, 600, 700); | |
547 | c10->cd(); | |
548 | fgWEnergyDensity->SetMinimum(0.); | |
549 | Double_t max=fgWEnergyDensity->GetMaximum(0,fgWEnergyDensity->GetParameter(0))*1.01; | |
550 | TH2F *h2f=new TH2F("h2fenergydens","Energy density",2,0,fgBMax,2,0,max); | |
551 | h2f->SetStats(0); | |
552 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
553 | h2f->GetYaxis()->SetTitle("fm^{-4}"); | |
554 | h2f->Draw(); | |
555 | fgWEnergyDensity->Draw("same"); | |
556 | c10->Update(); | |
f3a04204 | 557 | } |
558 | ||
710a8d90 | 559 | void AliFastGlauber::DrawPathLength0(Double_t b, Int_t iopt) const |
f3a04204 | 560 | { |
65aa45f2 | 561 | // |
562 | // Draw Path Length | |
563 | // | |
564 | TCanvas *c11 = new TCanvas("c11","Path Length",400,10,600,700); | |
565 | c11->cd(); | |
566 | fgWPathLength0->SetParameter(0, b); | |
567 | fgWPathLength0->SetParameter(1, Double_t(iopt)); | |
568 | fgWPathLength0->SetMinimum(0.); | |
569 | fgWPathLength0->SetMaximum(10.); | |
570 | TH2F *h2f=new TH2F("h2fpathlength0","Path length",2,-TMath::Pi(), TMath::Pi(),2,0,10.); | |
571 | h2f->SetStats(0); | |
572 | h2f->GetXaxis()->SetTitle("#phi [rad]"); | |
573 | h2f->GetYaxis()->SetTitle("l [fm]"); | |
574 | h2f->Draw(); | |
575 | fgWPathLength0->Draw("same"); | |
f3a04204 | 576 | } |
577 | ||
710a8d90 | 578 | void AliFastGlauber::DrawPathLength(Double_t b , Int_t ni, Int_t iopt) const |
f3a04204 | 579 | { |
65aa45f2 | 580 | // |
581 | // Draw Path Length | |
582 | // | |
583 | TCanvas *c12 = new TCanvas("c12","Path Length",400,10,600,700); | |
584 | c12->cd(); | |
585 | fgWAlmond->SetParameter(0, b); | |
586 | fgWPathLength->SetParameter(0, b); | |
587 | fgWPathLength->SetParameter(1, Double_t (ni)); | |
588 | fgWPathLength->SetParameter(2, Double_t (iopt)); | |
589 | fgWPathLength->SetMinimum(0.); | |
590 | fgWPathLength->SetMaximum(10.); | |
591 | TH2F *h2f=new TH2F("h2fpathlength","Path length",2,-TMath::Pi(), TMath::Pi(),2,0,10.); | |
592 | h2f->SetStats(0); | |
593 | h2f->GetXaxis()->SetTitle("#phi [rad]"); | |
594 | h2f->GetYaxis()->SetTitle("l [fm]"); | |
595 | h2f->Draw(); | |
596 | fgWPathLength->Draw("same"); | |
f3a04204 | 597 | } |
598 | ||
710a8d90 | 599 | void AliFastGlauber::DrawIntRadius(Double_t b) const |
2a103154 | 600 | { |
65aa45f2 | 601 | // |
602 | // Draw Interaction Radius | |
603 | // | |
604 | TCanvas *c13 = new TCanvas("c13","Interaction Radius",400,10,600,700); | |
605 | c13->cd(); | |
606 | fgWIntRadius->SetParameter(0, b); | |
607 | fgWIntRadius->SetMinimum(0); | |
608 | Double_t max=fgWIntRadius->GetMaximum(0,fgBMax)*1.01; | |
609 | TH2F *h2f=new TH2F("h2fintradius","Interaction Density",2,0.,fgBMax,2,0,max); | |
610 | h2f->SetStats(0); | |
611 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
612 | h2f->GetYaxis()->SetTitle("[fm^{-3}]"); | |
613 | h2f->Draw(); | |
614 | fgWIntRadius->Draw("same"); | |
2a103154 | 615 | } |
616 | ||
5b3a5a5d | 617 | Double_t AliFastGlauber::WSb(Double_t* x, Double_t* par) |
618 | { | |
65aa45f2 | 619 | // |
620 | // Woods-Saxon Parameterisation | |
621 | // as a function of radius (xx) | |
622 | // | |
710a8d90 | 623 | const Double_t kxx = x[0]; //fm |
624 | const Double_t kr0 = par[0]; //fm | |
625 | const Double_t kd = par[1]; //fm | |
626 | const Double_t kw = par[2]; //no units | |
627 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
628 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 629 | return y; //fm^-3 |
5b3a5a5d | 630 | } |
631 | ||
632 | Double_t AliFastGlauber::WSbz(Double_t* x, Double_t* par) | |
633 | { | |
65aa45f2 | 634 | // |
635 | // Wood Saxon Parameterisation | |
636 | // as a function of z and b | |
637 | // | |
710a8d90 | 638 | const Double_t kbb = x[0]; //fm |
639 | const Double_t kzz = x[1]; //fm | |
640 | const Double_t kr0 = par[0]; //fm | |
641 | const Double_t kd = par[1]; //fm | |
642 | const Double_t kw = par[2]; //no units | |
643 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
644 | const Double_t kxx = TMath::Sqrt(kbb*kbb+kzz*kzz); | |
645 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 646 | return y; //fm^-3 |
5b3a5a5d | 647 | } |
648 | ||
649 | Double_t AliFastGlauber::WSz(Double_t* x, Double_t* par) | |
650 | { | |
65aa45f2 | 651 | // |
652 | // Wood Saxon Parameterisation | |
653 | // as a function of z for fixed b | |
654 | // | |
710a8d90 | 655 | const Double_t kzz = x[0]; //fm |
656 | const Double_t kr0 = par[0]; //fm | |
657 | const Double_t kd = par[1]; //fm | |
658 | const Double_t kw = par[2]; //no units | |
659 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
660 | const Double_t kbb = par[4]; //fm | |
661 | const Double_t kxx = TMath::Sqrt(kbb*kbb+kzz*kzz); | |
662 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 663 | return y; //fm^-3 |
5b3a5a5d | 664 | } |
665 | ||
f86dad79 | 666 | Double_t AliFastGlauber::WSta(Double_t* x, Double_t* /*par*/) |
5b3a5a5d | 667 | { |
65aa45f2 | 668 | // |
669 | // Thickness function T_A | |
670 | // as a function of b | |
671 | // | |
710a8d90 | 672 | const Double_t kb = x[0]; |
673 | fgWSz->SetParameter(4, kb); | |
674 | Double_t y = 2. * fgWSz->Integral(0., fgBMax); | |
65aa45f2 | 675 | return y; //fm^-2 |
5b3a5a5d | 676 | } |
677 | ||
5b3a5a5d | 678 | Double_t AliFastGlauber::WStarfi(Double_t* x, Double_t* par) |
679 | { | |
65aa45f2 | 680 | // |
681 | // Kernel for overlap function: T_A(s)*T_A(s-b) | |
682 | // as a function of r and phi | |
710a8d90 | 683 | const Double_t kr1 = x[0]; |
684 | const Double_t kphi = x[1]; | |
685 | const Double_t kb = par[0]; | |
686 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
687 | Double_t y = kr1 * fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 688 | return y; //fm^-3 |
689 | } | |
690 | ||
691 | Double_t AliFastGlauber::WStaa(Double_t* x, Double_t* par) | |
692 | { | |
693 | // | |
694 | // Overlap function | |
695 | // T_{AB}=Int d2s T_A(s)*T_B(s-b) | |
696 | // as a function of b | |
697 | // (normalized to fA*fB) | |
698 | // | |
710a8d90 | 699 | const Double_t kb = x[0]; |
700 | const Double_t ka = par[0]; | |
701 | fgWStarfi->SetParameter(0, kb); | |
65aa45f2 | 702 | |
703 | // root integration seems to fail | |
704 | /* | |
705 | Double_t al[2]; | |
706 | Double_t bl[2]; | |
707 | al[0] = 1e-6; | |
708 | al[1] = fgBMax; | |
709 | bl[0] = 0.; | |
710 | bl[1] = TMath::Pi(); | |
711 | Double_t err; | |
712 | ||
713 | Double_t y = 2. * 208. * 208. * fgWStarfi->IntegralMultiple(2, al, bl, 0.001, err); | |
714 | printf("WStaa: %.5e %.5e %.5e\n", b, y, err); | |
715 | */ | |
716 | ||
717 | // | |
718 | // MC Integration | |
719 | // | |
720 | Double_t y = 0; | |
a42548b0 | 721 | |
722 | ||
65aa45f2 | 723 | for (Int_t i = 0; i < fgkMCInts; i++) |
724 | { | |
a42548b0 | 725 | |
710a8d90 | 726 | const Double_t kphi = TMath::Pi() * gRandom->Rndm(); |
727 | const Double_t kb1 = fgBMax * gRandom->Rndm(); | |
728 | y += fgWStarfi->Eval(kb1, kphi); | |
65aa45f2 | 729 | } |
730 | y *= 2. * TMath::Pi() * fgBMax / fgkMCInts; //fm^-2 | |
710a8d90 | 731 | y *= ka * ka * 0.1; //mbarn^-1 |
65aa45f2 | 732 | return y; |
5b3a5a5d | 733 | } |
734 | ||
1bc228f5 | 735 | Double_t AliFastGlauber::WKParticipants(Double_t* x, Double_t* par) |
736 | { | |
65aa45f2 | 737 | // |
738 | // Kernel for number of participants | |
739 | // as a function of r and phi | |
740 | // | |
710a8d90 | 741 | const Double_t kr1 = x[0]; |
742 | const Double_t kphi = x[1]; | |
743 | const Double_t kb = par[0]; //fm | |
744 | const Double_t ksig = par[1]; //mbarn | |
745 | const Double_t ka = par[2]; //mass number | |
746 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 +kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
747 | const Double_t kxsi = fgWSta->Eval(kr2) * ksig * 0.1; //no units | |
65aa45f2 | 748 | /* |
710a8d90 | 749 | Double_t y=(1-TMath::Power((1-xsi),aa)) |
65aa45f2 | 750 | */ |
710a8d90 | 751 | Double_t a = ka; |
752 | Double_t sum = ka * kxsi; | |
65aa45f2 | 753 | Double_t y = sum; |
710a8d90 | 754 | for (Int_t i = 1; i <= ka; i++) |
1bc228f5 | 755 | { |
65aa45f2 | 756 | a--; |
710a8d90 | 757 | sum *= (-kxsi) * a / Float_t(i+1); |
65aa45f2 | 758 | y += sum; |
1bc228f5 | 759 | } |
710a8d90 | 760 | y *= kr1 * fgWSta->Eval(kr1); |
65aa45f2 | 761 | return y; //fm^-1 |
1bc228f5 | 762 | } |
763 | ||
65aa45f2 | 764 | Double_t AliFastGlauber::WParticipants(Double_t* x, Double_t* par) |
765 | { | |
766 | // | |
767 | // Number of Participants as | |
768 | // a function of b | |
769 | // | |
710a8d90 | 770 | const Double_t kb = x[0]; |
771 | const Double_t ksig = par[0]; //mbarn | |
772 | const Double_t ka = par[1]; //mass number | |
773 | fgWKParticipants->SetParameter(0, kb); | |
774 | fgWKParticipants->SetParameter(1, ksig); | |
775 | fgWKParticipants->SetParameter(2, ka); | |
65aa45f2 | 776 | |
777 | // | |
778 | // MC Integration | |
779 | // | |
780 | Double_t y = 0; | |
781 | for (Int_t i = 0; i < fgkMCInts; i++) | |
782 | { | |
710a8d90 | 783 | const Double_t kphi = TMath::Pi() * gRandom->Rndm(); |
784 | const Double_t kb1 = fgBMax * gRandom->Rndm(); | |
785 | y += fgWKParticipants->Eval(kb1, kphi); | |
65aa45f2 | 786 | } |
710a8d90 | 787 | y *= 2. * ka * 2. * TMath::Pi() * fgBMax / fgkMCInts; |
65aa45f2 | 788 | return y; //no units |
789 | } | |
790 | ||
791 | Double_t AliFastGlauber::WSgeo(Double_t* x, Double_t* par) | |
792 | { | |
793 | // | |
794 | // Geometrical Cross-Section | |
795 | // as a function of b | |
796 | // | |
710a8d90 | 797 | const Double_t kb = x[0]; //fm |
798 | const Double_t ksigNN = par[0]; //mbarn | |
799 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
800 | Double_t y = 2. * TMath::Pi() * kb * (1. - TMath::Exp(- ksigNN * ktaa)); | |
65aa45f2 | 801 | return y; //fm |
802 | } | |
803 | ||
804 | Double_t AliFastGlauber::WSbinary(Double_t* x, Double_t* par) | |
805 | { | |
806 | // | |
710a8d90 | 807 | // Number of binary hard collisions |
65aa45f2 | 808 | // as a function of b |
809 | // | |
710a8d90 | 810 | const Double_t kb = x[0]; //fm |
811 | const Double_t ksig = par[0]; //mbarn | |
812 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
813 | Double_t y = 2. * TMath::Pi() * kb * ksig * ktaa; | |
65aa45f2 | 814 | return y; //fm |
815 | } | |
816 | ||
817 | Double_t AliFastGlauber::WSN(Double_t* x, Double_t* /*par*/) | |
818 | { | |
819 | // | |
820 | // Number of hard processes per event | |
821 | // as a function of b | |
710a8d90 | 822 | const Double_t kb = x[0]; |
823 | Double_t y = fgWSbinary->Eval(kb)/fgWSgeo->Eval(kb); | |
65aa45f2 | 824 | return y; //no units |
825 | } | |
826 | ||
827 | Double_t AliFastGlauber::WEnergyDensity(Double_t* x, Double_t* par) | |
828 | { | |
829 | // | |
830 | // Initial energy density | |
831 | // as a function of the impact parameter | |
832 | // | |
710a8d90 | 833 | const Double_t kb = x[0]; |
834 | const Double_t krA = par[0]; | |
65aa45f2 | 835 | // |
836 | // Attention: area of transverse reaction zone in hard-sphere approximation ! | |
710a8d90 | 837 | const Double_t krA2=krA*krA; |
838 | const Double_t kb2=kb*kb; | |
839 | const Double_t ksaa = (TMath::Pi() - 2. * TMath::ASin(kb/ 2./ krA)) * krA2 | |
840 | - kb * TMath::Sqrt(krA2 - kb2/ 4.); //fm^2 | |
841 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
842 | Double_t y=ktaa/ksaa*10; | |
65aa45f2 | 843 | return y; //fm^-4 |
844 | } | |
5b3a5a5d | 845 | |
f3a04204 | 846 | Double_t AliFastGlauber::WAlmond(Double_t* x, Double_t* par) |
847 | { | |
65aa45f2 | 848 | // |
849 | // Almond shaped interaction region | |
850 | // as a function of cartesian x,y. | |
851 | // | |
710a8d90 | 852 | const Double_t kb = par[0]; |
853 | const Double_t kxx = x[0] + kb/2.; | |
854 | const Double_t kyy = x[1]; | |
855 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
856 | const Double_t kphi = TMath::ATan2(kyy,kxx); | |
857 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
65aa45f2 | 858 | // |
859 | // Interaction probability calculated as product of thicknesses | |
860 | // | |
710a8d90 | 861 | Double_t y = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); |
65aa45f2 | 862 | return y; //fm^-4 |
f3a04204 | 863 | } |
864 | ||
865 | Double_t AliFastGlauber::WIntRadius(Double_t* x, Double_t* par) | |
866 | { | |
65aa45f2 | 867 | // |
868 | // Average interaction density over radius | |
869 | // at which interaction takes place | |
870 | // as a function of radius | |
871 | // | |
710a8d90 | 872 | const Double_t kr = x[0]; |
873 | const Double_t kb = par[0]; | |
874 | fgWAlmond->SetParameter(0, kb); | |
65aa45f2 | 875 | // Average over phi in small steps |
710a8d90 | 876 | const Double_t kdphi = 2. * TMath::Pi() / 100.; |
65aa45f2 | 877 | Double_t phi = 0.; |
878 | Double_t y = 0.; | |
879 | for (Int_t i = 0; i < 100; i++) { | |
710a8d90 | 880 | const Double_t kxx = kr * TMath::Cos(phi); |
881 | const Double_t kyy = kr * TMath::Sin(phi); | |
882 | y += fgWAlmond->Eval(kxx,kyy); | |
883 | phi += kdphi; | |
65aa45f2 | 884 | } // phi loop |
885 | // Result multiplied by Jacobian (2 pi r) | |
710a8d90 | 886 | y *= 2. * TMath::Pi() * kr / 100.; |
65aa45f2 | 887 | return y; //fm^-3 |
f3a04204 | 888 | } |
889 | ||
890 | Double_t AliFastGlauber::WPathLength0(Double_t* x, Double_t* par) | |
891 | { | |
65aa45f2 | 892 | // |
893 | // Path Length as a function of phi | |
894 | // for interaction point fixed at (0,0) | |
895 | // as a function of phi-direction | |
896 | // | |
897 | // Phi direction in Almond | |
710a8d90 | 898 | const Double_t kphi0 = x[0]; |
899 | const Double_t kb = par[0]; | |
65aa45f2 | 900 | // Path Length definition |
710a8d90 | 901 | const Int_t kiopt = Int_t(par[1]); |
65aa45f2 | 902 | |
903 | // Step along radial direction phi | |
904 | const Int_t kNp = 100; // Steps in r | |
905 | const Double_t kDr = fgBMax/kNp; | |
906 | Double_t r = 0.; | |
907 | Double_t rw = 0.; | |
908 | Double_t w = 0.; | |
909 | for (Int_t i = 0; i < kNp; i++) { | |
910 | // | |
911 | // Transform into target frame | |
912 | // | |
710a8d90 | 913 | const Double_t kxx = r * TMath::Cos(kphi0) + kb / 2.; |
914 | const Double_t kyy = r * TMath::Sin(kphi0); | |
915 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
916 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 917 | // Radius in projectile frame |
710a8d90 | 918 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); |
919 | const Double_t ky = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 920 | |
710a8d90 | 921 | rw += ky * r; |
922 | w += ky; | |
65aa45f2 | 923 | r += kDr; |
924 | } // radial steps | |
925 | ||
926 | Double_t y=0.; | |
ed79c723 | 927 | if (!kiopt) { // My length definition (is exact for hard disk) |
928 | if(w) y= 2. * rw / w; | |
929 | } else { | |
930 | const Double_t knorm=fgWSta->Eval(1e-4); | |
931 | if(knorm) y = TMath::Sqrt(2. * rw * kDr / knorm / knorm); | |
65aa45f2 | 932 | } |
933 | return y; //fm | |
934 | } | |
935 | ||
936 | Double_t AliFastGlauber::WPathLength(Double_t* x, Double_t* par) | |
937 | { | |
938 | // | |
939 | // Path Length as a function of phi | |
940 | // Interaction point from random distribution | |
941 | // as a function of the phi-direction | |
710a8d90 | 942 | const Double_t kphi0 = x[0]; |
943 | const Double_t kb = par[0]; | |
944 | fgWAlmond->SetParameter(0, kb); | |
945 | const Int_t kNpi = Int_t (par[1]); //Number of interactions | |
946 | const Int_t kiopt = Int_t(par[2]); //Path Length definition | |
65aa45f2 | 947 | |
948 | // | |
949 | // r-steps | |
950 | // | |
951 | const Int_t kNp = 100; | |
952 | const Double_t kDr = fgBMax/Double_t(kNp); | |
953 | Double_t l = 0.; // Path length | |
954 | for (Int_t in = 0; in < kNpi; in ++) { | |
f3a04204 | 955 | Double_t rw = 0.; |
956 | Double_t w = 0.; | |
65aa45f2 | 957 | // Interaction point |
958 | Double_t x0, y0; | |
959 | fgWAlmond->GetRandom2(x0, y0); | |
960 | // Initial radius | |
710a8d90 | 961 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
962 | const Int_t knps = Int_t ((fgBMax - kr0)/kDr) - 1; | |
f3a04204 | 963 | |
65aa45f2 | 964 | // Radial steps |
965 | Double_t r = 0.; | |
710a8d90 | 966 | for (Int_t i = 0; (i < knps ); i++) { |
65aa45f2 | 967 | // Transform into target frame |
710a8d90 | 968 | const Double_t kxx = x0 + r * TMath::Cos(kphi0) + kb / 2.; |
969 | const Double_t kyy = y0 + r * TMath::Sin(kphi0); | |
970 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
971 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 972 | // Radius in projectile frame |
710a8d90 | 973 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); |
974 | const Double_t ky = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 975 | |
710a8d90 | 976 | rw += ky * r; |
977 | w += ky; | |
65aa45f2 | 978 | r += kDr; |
979 | } // steps | |
980 | // Average over interactions | |
710a8d90 | 981 | if (!kiopt) { |
65aa45f2 | 982 | if(w) l += (2. * rw / w); |
8de7e046 | 983 | } else { |
710a8d90 | 984 | const Double_t knorm=fgWSta->Eval(1e-4); |
985 | if(knorm) l+= 2. * rw * kDr / knorm / knorm; | |
8de7e046 | 986 | } |
65aa45f2 | 987 | } // interactions |
988 | Double_t ret=0; | |
710a8d90 | 989 | if (!kiopt) |
65aa45f2 | 990 | ret= l / kNpi; |
991 | else | |
992 | ret=TMath::Sqrt( l / kNpi); | |
993 | return ret; //fm | |
f3a04204 | 994 | } |
995 | ||
710a8d90 | 996 | Double_t AliFastGlauber::CrossSection(Double_t b1, Double_t b2) const |
f3a04204 | 997 | { |
65aa45f2 | 998 | // |
999 | // Return the geometrical cross-section integrated from b1 to b2 | |
1000 | // | |
1001 | return fgWSgeo->Integral(b1, b2)*10.; //mbarn | |
1002 | } | |
f3a04204 | 1003 | |
710a8d90 | 1004 | Double_t AliFastGlauber::HardCrossSection(Double_t b1, Double_t b2) const |
5b3a5a5d | 1005 | { |
65aa45f2 | 1006 | // |
1007 | // Return the hard cross-section integrated from b1 to b2 | |
1008 | // | |
1009 | return fgWSbinary->Integral(b1, b2)*10.; //mbarn | |
5b3a5a5d | 1010 | } |
1011 | ||
710a8d90 | 1012 | Double_t AliFastGlauber::FractionOfHardCrossSection(Double_t b1, Double_t b2) const |
1bc228f5 | 1013 | { |
65aa45f2 | 1014 | // |
148c5ce5 | 1015 | // Return fraction of hard cross-section integrated from b1 to b2 |
65aa45f2 | 1016 | // |
1017 | return fgWSbinary->Integral(b1, b2)/fgWSbinary->Integral(0., 100.); | |
1bc228f5 | 1018 | } |
1019 | ||
f762082f | 1020 | Double_t AliFastGlauber::NHard(Double_t b1, Double_t b2) const |
1021 | { | |
1022 | // | |
1023 | // Number of binary hard collisions | |
1024 | // as a function of b (nucl/ex/0302016 eq. 19) | |
1025 | // | |
1026 | const Double_t kshard=HardCrossSection(b1,b2); | |
1027 | const Double_t ksgeo=CrossSection(b1,b2); | |
1028 | if(ksgeo>0) | |
1029 | return kshard/ksgeo; | |
1030 | else return -1; | |
1031 | } | |
1032 | ||
710a8d90 | 1033 | Double_t AliFastGlauber::Binaries(Double_t b) const |
5b3a5a5d | 1034 | { |
65aa45f2 | 1035 | // |
710a8d90 | 1036 | // Return number of binary hard collisions normalized to 1 at b=0 |
65aa45f2 | 1037 | // |
1038 | if(b==0) b=1e-4; | |
1039 | return fgWSN->Eval(b)/fgWSN->Eval(1e-4); | |
5b3a5a5d | 1040 | } |
1041 | ||
a42548b0 | 1042 | Double_t AliFastGlauber::MeanOverlap(Double_t b1, Double_t b2) |
1043 | { | |
1044 | // | |
1045 | // Calculate the mean overlap for impact parameter range b1 .. b2 | |
1046 | // | |
1047 | Double_t sum = 0.; | |
1048 | Double_t sumc = 0.; | |
1049 | Double_t b = b1; | |
1050 | ||
1051 | while (b < b2-0.005) { | |
1052 | Double_t nc = GetNumberOfCollisions(b); | |
1053 | sum += 10. * fgWStaa->Eval(b) * fgWSgeo->Eval(b) * 0.01 / (1. - TMath::Exp(-nc)); | |
1054 | sumc += 10. * fgWSgeo->Eval(b) * 0.01; | |
1055 | b += 0.01; | |
1056 | } | |
1057 | return (sum / CrossSection(b1, b2)); | |
1058 | } | |
1059 | ||
1060 | ||
1061 | Double_t AliFastGlauber::MeanNumberOfCollisionsPerEvent(Double_t b1, Double_t b2) | |
1062 | { | |
1063 | // | |
1064 | // Calculate the mean number of collisions per event for impact parameter range b1 .. b2 | |
1065 | // | |
1066 | Double_t sum = 0.; | |
1067 | Double_t sumc = 0.; | |
1068 | Double_t b = b1; | |
1069 | ||
1070 | while (b < b2-0.005) { | |
1071 | Double_t nc = GetNumberOfCollisions(b); | |
1072 | sum += nc / (1. - TMath::Exp(-nc)) * 10. * fgWSgeo->Eval(b) * 0.01; | |
1073 | sumc += 10. * fgWSgeo->Eval(b) * 0.01; | |
1074 | b += 0.01; | |
1075 | } | |
1076 | return (sum / CrossSection(b1, b2)); | |
1077 | } | |
1078 | ||
1079 | ||
710a8d90 | 1080 | Double_t AliFastGlauber::GetNumberOfBinaries(Double_t b) const |
5b3a5a5d | 1081 | { |
65aa45f2 | 1082 | // |
710a8d90 | 1083 | // Return number of binary hard collisions at b |
65aa45f2 | 1084 | // |
1085 | if(b==0) b=1e-4; | |
1086 | return fgWSN->Eval(b); | |
5b3a5a5d | 1087 | } |
1088 | ||
710a8d90 | 1089 | Double_t AliFastGlauber::Participants(Double_t b) const |
5b3a5a5d | 1090 | { |
65aa45f2 | 1091 | // |
1092 | // Return the number of participants normalized to 1 at b=0 | |
1093 | // | |
1094 | if(b==0) b=1e-4; | |
1095 | return (fgWParticipants->Eval(b)/fgWParticipants->Eval(1e-4)); | |
5b3a5a5d | 1096 | } |
1097 | ||
710a8d90 | 1098 | Double_t AliFastGlauber::GetNumberOfParticipants(Double_t b) const |
2a103154 | 1099 | { |
65aa45f2 | 1100 | // |
1101 | // Return the number of participants for impact parameter b | |
1102 | // | |
1103 | if(b==0) b=1e-4; | |
1104 | return (fgWParticipants->Eval(b)); | |
2a103154 | 1105 | } |
1106 | ||
710a8d90 | 1107 | Double_t AliFastGlauber::GetNumberOfCollisions(Double_t b) const |
1108 | { | |
1109 | // | |
1110 | // Return the number of collisions for impact parameter b | |
1111 | // | |
1112 | if(b==0) b=1e-4; | |
1113 | return (fgWStaa->Eval(b)*fSigmaNN); | |
1114 | } | |
1115 | ||
148c5ce5 | 1116 | Double_t AliFastGlauber::GetNumberOfCollisionsPerEvent(Double_t b) const |
1117 | { | |
1118 | // | |
1119 | // Return the number of collisions per event (at least one collision) | |
1120 | // for impact parameter b | |
1121 | // | |
1122 | Double_t n = GetNumberOfCollisions(b); | |
1123 | if (n > 0.) { | |
1124 | return (n / (1. - TMath::Exp(- n))); | |
1125 | } else { | |
1126 | return (0.); | |
1127 | } | |
1128 | } | |
1129 | ||
5b3a5a5d | 1130 | void AliFastGlauber::SimulateTrigger(Int_t n) |
1131 | { | |
65aa45f2 | 1132 | // |
1133 | // Simulates Trigger | |
1134 | // | |
1135 | TH1F* mbtH = new TH1F("mbtH", "MB Trigger b-Distribution", 100, 0., 20.); | |
1136 | TH1F* hdtH = new TH1F("hdtH", "Hard Trigger b-Distribution", 100, 0., 20.); | |
1137 | TH1F* mbmH = new TH1F("mbmH", "MB Trigger Multiplicity Distribution", 100, 0., 8000.); | |
1138 | TH1F* hdmH = new TH1F("hdmH", "Hard Trigger Multiplicity Distribution", 100, 0., 8000.); | |
5b3a5a5d | 1139 | |
65aa45f2 | 1140 | mbtH->SetXTitle("b [fm]"); |
1141 | hdtH->SetXTitle("b [fm]"); | |
1142 | mbmH->SetXTitle("Multiplicity"); | |
1143 | hdmH->SetXTitle("Multiplicity"); | |
5b3a5a5d | 1144 | |
65aa45f2 | 1145 | TCanvas *c0 = new TCanvas("c0","Trigger Simulation",400,10,600,700); |
1146 | c0->Divide(2,1); | |
1147 | TCanvas *c1 = new TCanvas("c1","Trigger Simulation",400,10,600,700); | |
1148 | c1->Divide(1,2); | |
5b3a5a5d | 1149 | |
65aa45f2 | 1150 | // |
1151 | // | |
1152 | Init(1); | |
1153 | for (Int_t iev = 0; iev < n; iev++) | |
5b3a5a5d | 1154 | { |
65aa45f2 | 1155 | Float_t b, p, mult; |
1156 | GetRandom(b, p, mult); | |
1157 | mbtH->Fill(b,1.); | |
1158 | hdtH->Fill(b, p); | |
1159 | mbmH->Fill(mult, 1.); | |
1160 | hdmH->Fill(mult, p); | |
1161 | ||
1162 | c0->cd(1); | |
1163 | mbtH->Draw(); | |
1164 | c0->cd(2); | |
1165 | hdtH->Draw(); | |
1166 | c0->Update(); | |
1167 | ||
1168 | c1->cd(1); | |
1169 | mbmH->Draw(); | |
1170 | c1->cd(2); | |
1171 | hdmH->Draw(); | |
1172 | c1->Update(); | |
5b3a5a5d | 1173 | } |
1174 | } | |
1175 | ||
1176 | void AliFastGlauber::GetRandom(Float_t& b, Float_t& p, Float_t& mult) | |
1177 | { | |
65aa45f2 | 1178 | // |
1179 | // Gives back a random impact parameter, hard trigger probability and multiplicity | |
1180 | // | |
1181 | b = fgWSgeo->GetRandom(); | |
710a8d90 | 1182 | const Float_t kmu = fgWSN->Eval(b); |
1183 | p = 1.-TMath::Exp(-kmu); | |
1184 | mult = 6000./fgWSN->Eval(1.) * kmu; | |
5b3a5a5d | 1185 | } |
1186 | ||
c2140715 | 1187 | void AliFastGlauber::GetRandom(Int_t& bin, Bool_t& hard) |
1188 | { | |
65aa45f2 | 1189 | // |
1190 | // Gives back a random impact parameter bin, and hard trigger decission | |
1191 | // | |
710a8d90 | 1192 | const Float_t kb = fgWSgeo->GetRandom(); |
1193 | const Float_t kmu = fgWSN->Eval(kb) * fSigmaHard; | |
1194 | const Float_t kp = 1.-TMath::Exp(-kmu); | |
1195 | if (kb < 5.) { | |
65aa45f2 | 1196 | bin = 1; |
710a8d90 | 1197 | } else if (kb < 8.6) { |
65aa45f2 | 1198 | bin = 2; |
710a8d90 | 1199 | } else if (kb < 11.2) { |
65aa45f2 | 1200 | bin = 3; |
710a8d90 | 1201 | } else if (kb < 13.2) { |
65aa45f2 | 1202 | bin = 4; |
710a8d90 | 1203 | } else if (kb < 15.0) { |
65aa45f2 | 1204 | bin = 5; |
1205 | } else { | |
1206 | bin = 6; | |
1207 | } | |
1208 | hard = kFALSE; | |
710a8d90 | 1209 | const Float_t kr = gRandom->Rndm(); |
1210 | if (kr < kp) hard = kTRUE; | |
c2140715 | 1211 | } |
1212 | ||
65aa45f2 | 1213 | Double_t AliFastGlauber::GetRandomImpactParameter(Double_t bmin, Double_t bmax) |
5b3a5a5d | 1214 | { |
65aa45f2 | 1215 | // |
1216 | // Gives back a random impact parameter in the range bmin .. bmax | |
1217 | // | |
1218 | Float_t b = -1.; | |
1219 | while(b < bmin || b > bmax) | |
1220 | b = fgWSgeo->GetRandom(); | |
1221 | return b; | |
5b3a5a5d | 1222 | } |
1223 | ||
710a8d90 | 1224 | void AliFastGlauber::StoreFunctions() const |
5b3a5a5d | 1225 | { |
65aa45f2 | 1226 | // |
1227 | // Store in file functions | |
1228 | // | |
1229 | TFile* ff = new TFile(fName.Data(),"recreate"); | |
1230 | fgWStaa->Write("WStaa"); | |
1231 | fgWParticipants->Write("WParticipants"); | |
1232 | ff->Close(); | |
1233 | return; | |
5b3a5a5d | 1234 | } |
1235 | ||
65aa45f2 | 1236 | //=================== Added by A. Dainese 11/02/04 =========================== |
1bc228f5 | 1237 | |
710a8d90 | 1238 | void AliFastGlauber::StoreAlmonds() const |
5b3a5a5d | 1239 | { |
65aa45f2 | 1240 | // |
1241 | // Store in file | |
1242 | // 40 almonds for b = (0.25+k*0.5) fm (k=0->39) | |
1243 | // | |
1244 | Char_t almondName[100]; | |
1245 | TFile* ff = new TFile(fName.Data(),"update"); | |
1246 | for(Int_t k=0; k<40; k++) { | |
1247 | sprintf(almondName,"WAlmondFixedB%d",k); | |
1248 | Double_t b = 0.25+k*0.5; | |
1249 | Info("StoreAlmonds"," b = %f\n",b); | |
1250 | fgWAlmond->SetParameter(0,b); | |
1251 | fgWAlmond->Write(almondName); | |
1252 | } | |
1253 | ff->Close(); | |
1254 | return; | |
5b3a5a5d | 1255 | } |
a2f2f511 | 1256 | |
a2f2f511 | 1257 | void AliFastGlauber::SetCentralityClass(Double_t xsecFrLow,Double_t xsecFrUp) |
1258 | { | |
1259 | // | |
65aa45f2 | 1260 | // Set limits of centrality class as fractions |
1261 | // of the geomtrical cross section | |
a2f2f511 | 1262 | // |
1263 | if(xsecFrLow>1. || xsecFrUp>1. || xsecFrLow>xsecFrUp) { | |
65aa45f2 | 1264 | Error("SetCentralityClass", "Please set 0 <= xsecFrLow <= xsecFrUp <= 1\n"); |
a2f2f511 | 1265 | return; |
1266 | } | |
1267 | ||
1268 | Double_t bLow=0.,bUp=0.; | |
1269 | Double_t xsecFr=0.; | |
710a8d90 | 1270 | const Double_t knorm=fgWSgeo->Integral(0.,100.); |
a2f2f511 | 1271 | while(xsecFr<xsecFrLow) { |
710a8d90 | 1272 | xsecFr = fgWSgeo->Integral(0.,bLow)/knorm; |
a2f2f511 | 1273 | bLow += 0.1; |
1274 | } | |
1275 | bUp = bLow; | |
1276 | while(xsecFr<xsecFrUp) { | |
710a8d90 | 1277 | xsecFr = fgWSgeo->Integral(0.,bUp)/knorm; |
a2f2f511 | 1278 | bUp += 0.1; |
1279 | } | |
1280 | ||
710a8d90 | 1281 | Info("SetCentralityClass", "Centrality class: %4.2f-%4.2f; %4.1f < b < %4.1f fm", |
a2f2f511 | 1282 | xsecFrLow,xsecFrUp,bLow,bUp); |
a2f2f511 | 1283 | fgWSbinary->SetRange(bLow,bUp); |
710a8d90 | 1284 | fBmin=bLow; |
1285 | fBmax=bUp; | |
a2f2f511 | 1286 | return; |
1287 | } | |
1288 | ||
1289 | void AliFastGlauber::GetRandomBHard(Double_t& b) | |
1290 | { | |
1291 | // | |
1292 | // Get random impact parameter according to distribution of | |
1293 | // hard (binary) cross-section, in the range defined by the centrality class | |
1294 | // | |
1295 | b = fgWSbinary->GetRandom(); | |
1296 | Int_t bin = 2*(Int_t)b; | |
1297 | if( (b-(Int_t)b) > 0.5) bin++; | |
7f2f270b | 1298 | fgWAlmondCurrent = fgWAlmondFixedB[bin]; |
a2f2f511 | 1299 | return; |
1300 | } | |
1301 | ||
1302 | void AliFastGlauber::GetRandomXY(Double_t& x,Double_t& y) | |
1303 | { | |
1304 | // | |
1305 | // Get random position of parton production point according to | |
1306 | // product of thickness functions | |
1307 | // | |
65aa45f2 | 1308 | fgWAlmondCurrent->GetRandom2(x,y); |
a2f2f511 | 1309 | return; |
1310 | } | |
1311 | ||
1312 | void AliFastGlauber::GetRandomPhi(Double_t& phi) | |
1313 | { | |
1314 | // | |
1315 | // Get random parton azimuthal propagation direction | |
1316 | // | |
1317 | phi = 2.*TMath::Pi()*gRandom->Rndm(); | |
1318 | return; | |
1319 | } | |
1320 | ||
65aa45f2 | 1321 | Double_t AliFastGlauber::CalculateLength(Double_t b,Double_t x0,Double_t y0,Double_t phi0) |
a2f2f511 | 1322 | { |
1323 | // | |
1324 | // Calculate path length for a parton with production point (x0,y0) | |
1325 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
1326 | // in a collision with impact parameter b | |
1327 | // | |
1328 | ||
1329 | // number of steps in l | |
1330 | const Int_t kNp = 100; | |
1331 | const Double_t kDl = fgBMax/Double_t(kNp); | |
1332 | ||
a2f2f511 | 1333 | if(fEllDef==1) { |
1334 | // | |
1335 | // Definition 1: | |
1336 | // | |
65aa45f2 | 1337 | // ell = 2 * \int_0^\infty dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) / |
1338 | // \int_0^\infty dl*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
a2f2f511 | 1339 | // |
a2f2f511 | 1340 | |
a2f2f511 | 1341 | // Initial radius |
710a8d90 | 1342 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
1343 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
65aa45f2 | 1344 | Double_t l = 0.; |
1345 | Double_t integral1 = 0.; | |
1346 | Double_t integral2 = 0.; | |
a2f2f511 | 1347 | // Radial steps |
710a8d90 | 1348 | for (Int_t i = 0; i < knps; i++) { |
a2f2f511 | 1349 | |
1350 | // Transform into target frame | |
710a8d90 | 1351 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1352 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1353 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1354 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
a2f2f511 | 1355 | // Radius in projectile frame |
710a8d90 | 1356 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1357 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
a2f2f511 | 1358 | |
710a8d90 | 1359 | integral1 += kprodTATB * l * kDl; |
1360 | integral2 += kprodTATB * kDl; | |
a2f2f511 | 1361 | l += kDl; |
1362 | } // steps | |
1363 | ||
65aa45f2 | 1364 | Double_t ell=0.; |
1365 | if(integral2) | |
1366 | ell = (2. * integral1 / integral2); | |
a2f2f511 | 1367 | return ell; |
a2f2f511 | 1368 | } else if(fEllDef==2) { |
1369 | // | |
1370 | // Definition 2: | |
1371 | // | |
1372 | // ell = \int_0^\infty dl* | |
65aa45f2 | 1373 | // \Theta((T_A*T_B)(x0+l*ux,y0+l*uy)-0.5*(T_A*T_B)(0,0)) |
a2f2f511 | 1374 | // |
1375 | ||
a2f2f511 | 1376 | // Initial radius |
710a8d90 | 1377 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
1378 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
1379 | const Double_t kprodTATBHalfMax = 0.5*fgWAlmondCurrent->Eval(0.,0.); | |
a2f2f511 | 1380 | // Radial steps |
65aa45f2 | 1381 | Double_t l = 0.; |
1382 | Double_t integral = 0.; | |
710a8d90 | 1383 | for (Int_t i = 0; i < knps; i++) { |
a2f2f511 | 1384 | // Transform into target frame |
710a8d90 | 1385 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1386 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1387 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1388 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
a2f2f511 | 1389 | // Radius in projectile frame |
710a8d90 | 1390 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1391 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
1392 | if(kprodTATB>kprodTATBHalfMax) integral += kDl; | |
a2f2f511 | 1393 | l += kDl; |
1394 | } // steps | |
65aa45f2 | 1395 | Double_t ell = integral; |
a2f2f511 | 1396 | return ell; |
a2f2f511 | 1397 | } else { |
65aa45f2 | 1398 | Error("CalculateLength","Wrong length definition setting: %d !\n",fEllDef); |
a2f2f511 | 1399 | return -1.; |
1400 | } | |
1401 | } | |
1402 | ||
83f67d08 | 1403 | void AliFastGlauber::GetLengthAndPhi(Double_t& ell,Double_t& phi,Double_t b) |
a2f2f511 | 1404 | { |
1405 | // | |
1406 | // Return length from random b, x0, y0, phi0 | |
83f67d08 | 1407 | // Return also phi0 |
a2f2f511 | 1408 | // |
1409 | Double_t x0,y0,phi0; | |
1410 | if(b<0.) GetRandomBHard(b); | |
1411 | GetRandomXY(x0,y0); | |
1412 | GetRandomPhi(phi0); | |
83f67d08 | 1413 | phi = phi0; |
a2f2f511 | 1414 | ell = CalculateLength(b,x0,y0,phi0); |
a2f2f511 | 1415 | return; |
1416 | } | |
1417 | ||
83f67d08 | 1418 | void AliFastGlauber::GetLength(Double_t& ell,Double_t b) |
a2f2f511 | 1419 | { |
1420 | // | |
83f67d08 | 1421 | // Return length from random b, x0, y0, phi0 |
a2f2f511 | 1422 | // |
83f67d08 | 1423 | Double_t phi; |
1424 | GetLengthAndPhi(ell,phi,b); | |
1425 | return; | |
1426 | } | |
1427 | ||
1428 | void AliFastGlauber::GetLengthsBackToBackAndPhi(Double_t& ell1,Double_t& ell2,Double_t &phi,Double_t b) | |
1429 | { | |
1430 | // | |
1431 | // Return 2 lengths back to back from random b, x0, y0, phi0 | |
1432 | // Return also phi0 | |
1433 | // | |
a2f2f511 | 1434 | Double_t x0,y0,phi0; |
1435 | if(b<0.) GetRandomBHard(b); | |
1436 | GetRandomXY(x0,y0); | |
1437 | GetRandomPhi(phi0); | |
710a8d90 | 1438 | const Double_t kphi0plusPi = phi0+TMath::Pi(); |
83f67d08 | 1439 | phi = phi0; |
a2f2f511 | 1440 | ell1 = CalculateLength(b,x0,y0,phi0); |
710a8d90 | 1441 | ell2 = CalculateLength(b,x0,y0,kphi0plusPi); |
a2f2f511 | 1442 | return; |
1443 | } | |
1444 | ||
83f67d08 | 1445 | void AliFastGlauber::GetLengthsBackToBack(Double_t& ell1,Double_t& ell2, |
1446 | Double_t b) | |
1447 | { | |
1448 | // | |
1449 | // Return 2 lengths back to back from random b, x0, y0, phi0 | |
1450 | // | |
1451 | Double_t phi; | |
1452 | GetLengthsBackToBackAndPhi(ell1,ell2,phi,b); | |
1453 | return; | |
1454 | } | |
1455 | ||
1bc228f5 | 1456 | void AliFastGlauber::GetLengthsForPythia(Int_t n,Double_t* phi,Double_t* ell, Double_t b) |
a2f2f511 | 1457 | { |
1458 | // | |
1459 | // Returns lenghts for n partons with azimuthal angles phi[n] | |
1460 | // from random b, x0, y0 | |
1461 | // | |
1bc228f5 | 1462 | Double_t x0, y0; |
1463 | if(b < 0.) GetRandomBHard(b); | |
a2f2f511 | 1464 | GetRandomXY(x0,y0); |
1bc228f5 | 1465 | for(Int_t i = 0; i< n; i++) ell[i] = CalculateLength(b,x0,y0,phi[i]); |
a2f2f511 | 1466 | return; |
1467 | } | |
1468 | ||
1469 | void AliFastGlauber::PlotBDistr(Int_t n) | |
65aa45f2 | 1470 | { |
a2f2f511 | 1471 | // |
1472 | // Plot distribution of n impact parameters | |
1473 | // | |
1474 | Double_t b; | |
1475 | TH1F *hB = new TH1F("hB","dN/db",100,0,fgBMax); | |
1476 | hB->SetXTitle("b [fm]"); | |
1477 | hB->SetYTitle("dN/db [a.u.]"); | |
1478 | hB->SetFillColor(3); | |
a2f2f511 | 1479 | for(Int_t i=0; i<n; i++) { |
1480 | GetRandomBHard(b); | |
1481 | hB->Fill(b); | |
1482 | } | |
a2f2f511 | 1483 | TCanvas *cB = new TCanvas("cB","Impact parameter distribution",0,0,500,500); |
1484 | cB->cd(); | |
1485 | hB->Draw(); | |
a2f2f511 | 1486 | return; |
1487 | } | |
1488 | ||
d3d4a92f | 1489 | void AliFastGlauber::PlotLengthDistr(Int_t n,Bool_t save,const char *fname) |
a2f2f511 | 1490 | { |
1491 | // | |
1492 | // Plot length distribution | |
1493 | // | |
1494 | Double_t ell; | |
710a8d90 | 1495 | TH1F *hEll = new TH1F("hEll","Length distribution",64,-0.5,15); |
a2f2f511 | 1496 | hEll->SetXTitle("Transverse path length, L [fm]"); |
1497 | hEll->SetYTitle("Probability"); | |
1498 | hEll->SetFillColor(2); | |
a2f2f511 | 1499 | for(Int_t i=0; i<n; i++) { |
1500 | GetLength(ell); | |
1501 | hEll->Fill(ell); | |
1502 | } | |
1503 | hEll->Scale(1/(Double_t)n); | |
a2f2f511 | 1504 | TCanvas *cL = new TCanvas("cL","Length distribution",0,0,500,500); |
1505 | cL->cd(); | |
1506 | hEll->Draw(); | |
1507 | ||
1508 | if(save) { | |
1509 | TFile *f = new TFile(fname,"recreate"); | |
1510 | hEll->Write(); | |
1511 | f->Close(); | |
1512 | } | |
1513 | return; | |
1514 | } | |
1515 | ||
d3d4a92f | 1516 | void AliFastGlauber::PlotLengthB2BDistr(Int_t n,Bool_t save,const char *fname) |
a2f2f511 | 1517 | { |
1518 | // | |
1519 | // Plot lengths back-to-back distributions | |
1520 | // | |
1521 | Double_t ell1,ell2; | |
1522 | TH2F *hElls = new TH2F("hElls","Lengths back-to-back",100,0,15,100,0,15); | |
1523 | hElls->SetXTitle("Transverse path length, L [fm]"); | |
1524 | hElls->SetYTitle("Transverse path length, L [fm]"); | |
a2f2f511 | 1525 | for(Int_t i=0; i<n; i++) { |
1526 | GetLengthsBackToBack(ell1,ell2); | |
1527 | hElls->Fill(ell1,ell2); | |
1528 | } | |
1529 | hElls->Scale(1/(Double_t)n); | |
a2f2f511 | 1530 | TCanvas *cLs = new TCanvas("cLs","Length back-to-back distribution",0,0,500,500); |
1531 | gStyle->SetPalette(1,0); | |
1532 | cLs->cd(); | |
1533 | hElls->Draw("col,Z"); | |
a2f2f511 | 1534 | if(save) { |
1535 | TFile *f = new TFile(fname,"recreate"); | |
1536 | hElls->Write(); | |
1537 | f->Close(); | |
1538 | } | |
1539 | return; | |
1540 | } | |
1541 | ||
710a8d90 | 1542 | void AliFastGlauber::PlotAlmonds() const |
1543 | { | |
1544 | // | |
1545 | // Plot almonds for some impact parameters | |
1546 | // | |
1547 | TCanvas *c = new TCanvas("c","Almonds",0,0,500,500); | |
1548 | gStyle->SetPalette(1,0); | |
1549 | c->Divide(2,2); | |
1550 | c->cd(1); | |
7f2f270b | 1551 | fgWAlmondFixedB[0]->Draw("cont1"); |
710a8d90 | 1552 | c->cd(2); |
7f2f270b | 1553 | fgWAlmondFixedB[10]->Draw("cont1"); |
710a8d90 | 1554 | c->cd(3); |
7f2f270b | 1555 | fgWAlmondFixedB[20]->Draw("cont1"); |
710a8d90 | 1556 | c->cd(4); |
7f2f270b | 1557 | fgWAlmondFixedB[30]->Draw("cont1"); |
710a8d90 | 1558 | return; |
1559 | } | |
1560 | ||
65aa45f2 | 1561 | //=================== Added by A. Dainese 05/03/04 =========================== |
1562 | ||
1563 | void AliFastGlauber::CalculateI0I1(Double_t& integral0,Double_t& integral1, | |
1564 | Double_t b,Double_t x0,Double_t y0, | |
710a8d90 | 1565 | Double_t phi0,Double_t ellCut) const |
a2f2f511 | 1566 | { |
65aa45f2 | 1567 | // |
1568 | // Calculate integrals: | |
e9663638 | 1569 | // integral0 = \int_0^ellCut dl*(T_A*T_B)(x0+l*ux,y0+l*uy) |
1570 | // integral1 = \int_0^ellCut dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
a2f2f511 | 1571 | // |
65aa45f2 | 1572 | // for a parton with production point (x0,y0) |
1573 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
1574 | // in a collision with impact parameter b | |
1575 | // | |
1576 | ||
1577 | // number of steps in l | |
1578 | const Int_t kNp = 100; | |
1579 | const Double_t kDl = fgBMax/Double_t(kNp); | |
1580 | ||
1581 | // Initial radius | |
710a8d90 | 1582 | const Double_t kr0 = TMath::Sqrt(x0 * x0 + y0 * y0); |
1583 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
65aa45f2 | 1584 | |
1585 | // Radial steps | |
1586 | Double_t l = 0.; | |
1587 | integral0 = 0.; | |
1588 | integral1 = 0.; | |
1589 | Int_t i = 0; | |
710a8d90 | 1590 | while((i < knps) && (l < ellCut)) { |
65aa45f2 | 1591 | // Transform into target frame |
710a8d90 | 1592 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1593 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1594 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1595 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 1596 | // Radius in projectile frame |
710a8d90 | 1597 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1598 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
1599 | integral0 += kprodTATB * kDl; | |
1600 | integral1 += kprodTATB * l * kDl; | |
65aa45f2 | 1601 | l += kDl; |
1602 | i++; | |
1603 | } // steps | |
1604 | return; | |
1605 | } | |
1606 | ||
83f67d08 | 1607 | void AliFastGlauber::GetI0I1AndPhi(Double_t& integral0,Double_t& integral1, |
1608 | Double_t& phi, | |
1609 | Double_t ellCut,Double_t b) | |
65aa45f2 | 1610 | { |
a2f2f511 | 1611 | // |
65aa45f2 | 1612 | // Return I0 and I1 from random b, x0, y0, phi0 |
83f67d08 | 1613 | // Return also phi |
65aa45f2 | 1614 | // |
1615 | Double_t x0,y0,phi0; | |
1616 | if(b<0.) GetRandomBHard(b); | |
1617 | GetRandomXY(x0,y0); | |
1618 | GetRandomPhi(phi0); | |
83f67d08 | 1619 | phi = phi0; |
65aa45f2 | 1620 | CalculateI0I1(integral0,integral1,b,x0,y0,phi0,ellCut); |
1621 | return; | |
1622 | } | |
a2f2f511 | 1623 | |
83f67d08 | 1624 | void AliFastGlauber::GetI0I1(Double_t& integral0,Double_t& integral1, |
1625 | Double_t ellCut,Double_t b) | |
1626 | { | |
1627 | // | |
1628 | // Return I0 and I1 from random b, x0, y0, phi0 | |
1629 | // | |
1630 | Double_t phi; | |
1631 | GetI0I1AndPhi(integral0,integral1,phi,ellCut,b); | |
1632 | return; | |
1633 | } | |
1634 | ||
1635 | void AliFastGlauber::GetI0I1BackToBackAndPhi(Double_t& integral01,Double_t& integral11, | |
1636 | Double_t& integral02,Double_t& integral12, | |
1637 | Double_t& phi, | |
1638 | Double_t ellCut,Double_t b) | |
65aa45f2 | 1639 | { |
1640 | // | |
1641 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
83f67d08 | 1642 | // Return also phi0 |
65aa45f2 | 1643 | // |
1644 | Double_t x0,y0,phi0; | |
1645 | if(b<0.) GetRandomBHard(b); | |
1646 | GetRandomXY(x0,y0); | |
1647 | GetRandomPhi(phi0); | |
83f67d08 | 1648 | phi = phi0; |
710a8d90 | 1649 | const Double_t kphi0plusPi = phi0+TMath::Pi(); |
c54404bf | 1650 | CalculateI0I1(integral01,integral11,b,x0,y0,phi0,ellCut); |
1651 | CalculateI0I1(integral02,integral12,b,x0,y0,kphi0plusPi,ellCut); | |
1652 | return; | |
1653 | } | |
1654 | ||
1655 | void AliFastGlauber::GetI0I1BackToBackAndPhiAndXY(Double_t& integral01,Double_t& integral11, | |
1656 | Double_t& integral02,Double_t& integral12, | |
1657 | Double_t& phi,Double_t &x,Double_t &y, | |
1658 | Double_t ellCut,Double_t b) | |
1659 | { | |
1660 | // | |
1661 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
1662 | // Return also phi0 | |
1663 | // | |
1664 | Double_t x0,y0,phi0; | |
1665 | if(b<0.) GetRandomBHard(b); | |
1666 | GetRandomXY(x0,y0); | |
1667 | GetRandomPhi(phi0); | |
1668 | phi = phi0; x=x0; y=y0; | |
1669 | const Double_t kphi0plusPi = phi0+TMath::Pi(); | |
65aa45f2 | 1670 | CalculateI0I1(integral01,integral11,b,x0,y0,phi0,ellCut); |
710a8d90 | 1671 | CalculateI0I1(integral02,integral12,b,x0,y0,kphi0plusPi,ellCut); |
65aa45f2 | 1672 | return; |
1673 | } | |
a2f2f511 | 1674 | |
83f67d08 | 1675 | void AliFastGlauber::GetI0I1BackToBack(Double_t& integral01,Double_t& integral11, |
1676 | Double_t& integral02,Double_t& integral12, | |
1677 | Double_t ellCut,Double_t b) | |
1678 | { | |
1679 | // | |
1680 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
1681 | // | |
1682 | Double_t phi; | |
1683 | GetI0I1BackToBackAndPhi(integral01,integral11,integral02,integral12, | |
1684 | phi,ellCut,b); | |
1685 | return; | |
1686 | } | |
1687 | ||
65aa45f2 | 1688 | void AliFastGlauber::GetI0I1ForPythia(Int_t n,Double_t* phi, |
1689 | Double_t* integral0,Double_t* integral1, | |
1690 | Double_t ellCut,Double_t b) | |
1691 | { | |
1692 | // | |
1693 | // Returns I0 and I1 pairs for n partons with azimuthal angles phi[n] | |
1694 | // from random b, x0, y0 | |
1695 | // | |
1696 | Double_t x0,y0; | |
1697 | if(b<0.) GetRandomBHard(b); | |
1698 | GetRandomXY(x0,y0); | |
1699 | for(Int_t i=0; i<n; i++) | |
1700 | CalculateI0I1(integral0[i],integral1[i],b,x0,y0,phi[i],ellCut); | |
1701 | return; | |
1702 | } | |
1703 | ||
2e3b5c95 | 1704 | void AliFastGlauber::GetI0I1ForPythiaAndXY(Int_t n,Double_t* phi, |
1705 | Double_t* integral0,Double_t* integral1, | |
1706 | Double_t &x,Double_t& y, | |
1707 | Double_t ellCut,Double_t b) | |
1708 | { | |
1709 | // | |
1710 | // Returns I0 and I1 pairs for n partons with azimuthal angles phi[n] | |
1711 | // from random b, x0, y0 and return x0,y0 | |
1712 | // | |
1713 | Double_t x0,y0; | |
1714 | if(b<0.) GetRandomBHard(b); | |
1715 | GetRandomXY(x0,y0); | |
1716 | for(Int_t i=0; i<n; i++) | |
1717 | CalculateI0I1(integral0[i],integral1[i],b,x0,y0,phi[i],ellCut); | |
1718 | x=x0; | |
1719 | y=y0; | |
1720 | return; | |
1721 | } | |
1722 | ||
65aa45f2 | 1723 | void AliFastGlauber::PlotI0I1Distr(Int_t n,Double_t ellCut, |
d3d4a92f | 1724 | Bool_t save,const char *fname) |
65aa45f2 | 1725 | { |
1726 | // | |
bbf8513d | 1727 | // Plot I0-I1 distribution |
65aa45f2 | 1728 | // |
1729 | Double_t i0,i1; | |
bbf8513d | 1730 | TH2F *hI0I1s = new TH2F("hI0I1s","I_{0} versus I_{1}",1000,0,0.001,1000,0,0.01); |
1731 | hI0I1s->SetXTitle("I_{0} [fm^{-3}]"); | |
1732 | hI0I1s->SetYTitle("I_{1} [fm^{-2}]"); | |
1733 | ||
65aa45f2 | 1734 | TH1F *hI0 = new TH1F("hI0","I_{0} = #hat{q}L / k", |
bbf8513d | 1735 | 1000,0,0.001); |
65aa45f2 | 1736 | hI0->SetXTitle("I_{0} [fm^{-3}]"); |
1737 | hI0->SetYTitle("Probability"); | |
1738 | hI0->SetFillColor(3); | |
1739 | TH1F *hI1 = new TH1F("hI1","I_{1} = #omega_{c} / k", | |
bbf8513d | 1740 | 1000,0,0.01); |
65aa45f2 | 1741 | hI1->SetXTitle("I_{1} [fm^{-2}]"); |
1742 | hI1->SetYTitle("Probability"); | |
1743 | hI1->SetFillColor(4); | |
1744 | TH1F *h2 = new TH1F("h2","2 I_{1}^{2}/I_{0} = R / k", | |
1745 | 100,0,0.02); | |
1746 | h2->SetXTitle("2 I_{1}^{2}/I_{0} [fm^{-1}]"); | |
1747 | h2->SetYTitle("Probability"); | |
1748 | h2->SetFillColor(2); | |
1749 | TH1F *h3 = new TH1F("h3","2 I_{1}/I_{0} = L", | |
1750 | 100,0,15); | |
1751 | h3->SetXTitle("2 I_{1}/I_{0} [fm]"); | |
1752 | h3->SetYTitle("Probability"); | |
1753 | h3->SetFillColor(5); | |
1754 | TH1F *h4 = new TH1F("h4","I_{0}^{2}/(2 I_{1}) = #hat{q} / k", | |
1755 | 100,0,0.00015); | |
1756 | h4->SetXTitle("I_{0}^{2}/(2 I_{1}) [fm^{-4}]"); | |
1757 | h4->SetYTitle("Probability"); | |
1758 | h4->SetFillColor(7); | |
1759 | ||
1760 | for(Int_t i=0; i<n; i++) { | |
1761 | GetI0I1(i0,i1,ellCut); | |
bbf8513d | 1762 | hI0I1s->Fill(i0,i1); |
65aa45f2 | 1763 | hI0->Fill(i0); |
1764 | hI1->Fill(i1); | |
1765 | h2->Fill(2.*i1*i1/i0); | |
1766 | h3->Fill(2.*i1/i0); | |
1767 | h4->Fill(i0*i0/2./i1); | |
a2f2f511 | 1768 | } |
65aa45f2 | 1769 | hI0->Scale(1/(Double_t)n); |
1770 | hI1->Scale(1/(Double_t)n); | |
bbf8513d | 1771 | h2->Scale(1/(Double_t)n); |
1772 | h3->Scale(1/(Double_t)n); | |
1773 | h4->Scale(1/(Double_t)n); | |
1774 | hI0I1s->Scale(1/(Double_t)n); | |
65aa45f2 | 1775 | |
1776 | TCanvas *cI0I1 = new TCanvas("cI0I1","I0 and I1",0,0,900,700); | |
1777 | cI0I1->Divide(3,2); | |
1778 | cI0I1->cd(1); | |
1779 | hI0->Draw(); | |
1780 | cI0I1->cd(2); | |
1781 | hI1->Draw(); | |
1782 | cI0I1->cd(3); | |
1783 | h2->Draw(); | |
1784 | cI0I1->cd(4); | |
1785 | h3->Draw(); | |
1786 | cI0I1->cd(5); | |
1787 | h4->Draw(); | |
bbf8513d | 1788 | cI0I1->cd(6); |
1789 | gStyle->SetPalette(1,0); | |
1790 | hI0I1s->Draw("col,Z"); | |
a2f2f511 | 1791 | |
65aa45f2 | 1792 | if(save) { |
1793 | TFile *f = new TFile(fname,"recreate"); | |
bbf8513d | 1794 | hI0I1s->Write(); |
65aa45f2 | 1795 | hI0->Write(); |
1796 | hI1->Write(); | |
1797 | h2->Write(); | |
1798 | h3->Write(); | |
1799 | h4->Write(); | |
1800 | f->Close(); | |
1801 | } | |
a2f2f511 | 1802 | return; |
1803 | } | |
1804 | ||
65aa45f2 | 1805 | void AliFastGlauber::PlotI0I1B2BDistr(Int_t n,Double_t ellCut, |
d3d4a92f | 1806 | Bool_t save,const char *fname) |
a2f2f511 | 1807 | { |
1808 | // | |
bbf8513d | 1809 | // Plot I0-I1 back-to-back distributions |
a2f2f511 | 1810 | // |
65aa45f2 | 1811 | Double_t i01,i11,i02,i12; |
1812 | TH2F *hI0s = new TH2F("hI0s","I_{0}'s back-to-back",100,0,100,100,0,100); | |
1813 | hI0s->SetXTitle("I_{0} [fm^{-3}]"); | |
1814 | hI0s->SetYTitle("I_{0} [fm^{-3}]"); | |
1815 | TH2F *hI1s = new TH2F("hI1s","I_{1}'s back-to-back",100,0,100,100,0,100); | |
1816 | hI1s->SetXTitle("I_{1} [fm^{-2}]"); | |
1817 | hI1s->SetYTitle("I_{1} [fm^{-2}]"); | |
a2f2f511 | 1818 | |
65aa45f2 | 1819 | for(Int_t i=0; i<n; i++) { |
1820 | GetI0I1BackToBack(i01,i11,i02,i12,ellCut); | |
1821 | hI0s->Fill(i01,i02); | |
1822 | hI1s->Fill(i11,i12); | |
1823 | } | |
1824 | hI0s->Scale(1/(Double_t)n); | |
1825 | hI1s->Scale(1/(Double_t)n); | |
1826 | ||
1827 | TCanvas *cI0I1s = new TCanvas("cI0I1s","I0 and I1 back-to-back distributions",0,0,800,400); | |
a2f2f511 | 1828 | gStyle->SetPalette(1,0); |
65aa45f2 | 1829 | cI0I1s->Divide(2,1); |
1830 | cI0I1s->cd(1); | |
1831 | hI0s->Draw("col,Z"); | |
1832 | cI0I1s->cd(2); | |
1833 | hI1s->Draw("col,Z"); | |
a2f2f511 | 1834 | |
65aa45f2 | 1835 | if(save) { |
1836 | TFile *f = new TFile(fname,"recreate"); | |
1837 | hI0s->Write(); | |
1838 | hI1s->Write(); | |
1839 | f->Close(); | |
1840 | } | |
a2f2f511 | 1841 | return; |
1842 | } | |
710a8d90 | 1843 | |
a42548b0 | 1844 | AliFastGlauber& AliFastGlauber::operator=(const AliFastGlauber& rhs) |
1845 | { | |
1846 | // Assignment operator | |
1847 | rhs.Copy(*this); | |
1848 | return *this; | |
1849 | } | |
1850 | ||
1851 | void AliFastGlauber::Copy(TObject&) const | |
1852 | { | |
1853 | // | |
1854 | // Copy | |
1855 | // | |
1856 | Fatal("Copy","Not implemented!\n"); | |
1857 | } | |
1858 |