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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(); | |
5373d3f7 | 109 | fXY[0] = fXY[1] = 0; |
462421a4 | 110 | fI0I1[0] = fI0I1[1] = 0; |
65aa45f2 | 111 | } |
112 | ||
a42548b0 | 113 | AliFastGlauber::AliFastGlauber(const AliFastGlauber & gl) |
e6e76983 | 114 | :TObject(gl), |
115 | fWSr0(0.), | |
116 | fWSd(0.), | |
117 | fWSw(0.), | |
118 | fWSn(0.), | |
119 | fSigmaHard(0.), | |
120 | fSigmaNN(0.), | |
121 | fA(0), | |
122 | fBmin(0.), | |
123 | fBmax(0.), | |
124 | fEllDef(0), | |
125 | fName() | |
a42548b0 | 126 | { |
127 | // Copy constructor | |
128 | gl.Copy(*this); | |
5373d3f7 | 129 | fXY[0] = fXY[1] = 0; |
462421a4 | 130 | fI0I1[0] = fI0I1[1] = 0; |
a42548b0 | 131 | } |
132 | ||
18b7a4a1 | 133 | AliFastGlauber* AliFastGlauber::Instance() |
134 | { | |
135 | // Set random number generator | |
136 | if (fgGlauber) { | |
137 | return fgGlauber; | |
138 | } else { | |
139 | fgGlauber = new AliFastGlauber(); | |
140 | return fgGlauber; | |
141 | } | |
142 | } | |
143 | ||
65aa45f2 | 144 | AliFastGlauber::~AliFastGlauber() |
145 | { | |
a42548b0 | 146 | // Destructor |
7f2f270b | 147 | for(Int_t k=0; k<40; k++) delete fgWAlmondFixedB[k]; |
65aa45f2 | 148 | } |
149 | ||
150 | void AliFastGlauber::SetAuAuRhic() | |
151 | { | |
152 | //Set all parameters for RHIC | |
153 | SetWoodSaxonParametersAu(); | |
154 | SetHardCrossSection(); | |
710a8d90 | 155 | SetNNCrossSection(42); |
65aa45f2 | 156 | SetNucleus(197); |
157 | SetFileName("$(ALICE_ROOT)/FASTSIM/data/glauberAuAu.root"); | |
158 | } | |
159 | ||
160 | void AliFastGlauber::SetPbPbLHC() | |
161 | { | |
162 | //Set all parameters for LHC | |
163 | SetWoodSaxonParametersPb(); | |
164 | SetHardCrossSection(); | |
165 | SetNNCrossSection(); | |
166 | SetNucleus(); | |
167 | SetFileName(); | |
5b3a5a5d | 168 | } |
169 | ||
170 | void AliFastGlauber::Init(Int_t mode) | |
171 | { | |
65aa45f2 | 172 | // Initialisation |
173 | // mode = 0; all functions are calculated | |
174 | // mode = 1; overlap function is read from file (for Pb-Pb only) | |
175 | // mode = 2; interaction almond functions are read from file | |
176 | // USE THIS FOR PATH LENGTH CALC.! | |
177 | // | |
a2f2f511 | 178 | |
65aa45f2 | 179 | // |
180 | Reset(); | |
181 | // | |
5b3a5a5d | 182 | |
65aa45f2 | 183 | // |
184 | // Wood-Saxon | |
185 | // | |
186 | fgWSb = new TF1("WSb", WSb, 0, fgBMax, 4); | |
187 | fgWSb->SetParameter(0, fWSr0); | |
188 | fgWSb->SetParameter(1, fWSd); | |
189 | fgWSb->SetParameter(2, fWSw); | |
190 | fgWSb->SetParameter(3, fWSn); | |
191 | ||
fac5662b | 192 | fgWSbz = new TF2("WSbz", WSbz, 0, fgBMax, 0, fgBMax, 4); |
65aa45f2 | 193 | fgWSbz->SetParameter(0, fWSr0); |
194 | fgWSbz->SetParameter(1, fWSd); | |
195 | fgWSbz->SetParameter(2, fWSw); | |
196 | fgWSbz->SetParameter(3, fWSn); | |
197 | ||
198 | fgWSz = new TF1("WSz", WSz, 0, fgBMax, 5); | |
199 | fgWSz->SetParameter(0, fWSr0); | |
200 | fgWSz->SetParameter(1, fWSd); | |
201 | fgWSz->SetParameter(2, fWSw); | |
202 | fgWSz->SetParameter(3, fWSn); | |
203 | ||
204 | // | |
205 | // Thickness | |
206 | // | |
207 | fgWSta = new TF1("WSta", WSta, 0., fgBMax, 0); | |
5b3a5a5d | 208 | |
65aa45f2 | 209 | // |
210 | // Overlap Kernel | |
211 | // | |
212 | fgWStarfi = new TF2("WStarfi", WStarfi, 0., fgBMax, 0., TMath::Pi(), 1); | |
213 | fgWStarfi->SetParameter(0, 0.); | |
214 | fgWStarfi->SetNpx(200); | |
215 | fgWStarfi->SetNpy(20); | |
8de7e046 | 216 | |
65aa45f2 | 217 | // |
218 | // Participants Kernel | |
219 | // | |
220 | fgWKParticipants = new TF2("WKParticipants", WKParticipants, 0., fgBMax, 0., TMath::Pi(), 3); | |
221 | fgWKParticipants->SetParameter(0, 0.); | |
222 | fgWKParticipants->SetParameter(1, fSigmaNN); | |
223 | fgWKParticipants->SetParameter(2, fA); | |
224 | fgWKParticipants->SetNpx(200); | |
225 | fgWKParticipants->SetNpy(20); | |
f3a04204 | 226 | |
65aa45f2 | 227 | // |
228 | // Overlap and Participants | |
229 | // | |
230 | if (!mode) { | |
231 | fgWStaa = new TF1("WStaa", WStaa, 0., fgBMax, 1); | |
232 | fgWStaa->SetNpx(100); | |
233 | fgWStaa->SetParameter(0,fA); | |
234 | fgWStaa->SetNpx(100); | |
235 | fgWParticipants = new TF1("WParticipants", WParticipants, 0., fgBMax, 2); | |
236 | fgWParticipants->SetParameter(0, fSigmaNN); | |
237 | fgWParticipants->SetParameter(1, fA); | |
238 | fgWParticipants->SetNpx(100); | |
239 | } else { | |
240 | Info("Init","Reading overlap function from file %s",fName.Data()); | |
241 | TFile* f = new TFile(fName.Data()); | |
242 | if(!f->IsOpen()){ | |
243 | Fatal("Init", "Could not open file %s",fName.Data()); | |
244 | } | |
245 | fgWStaa = (TF1*) f->Get("WStaa"); | |
246 | fgWParticipants = (TF1*) f->Get("WParticipants"); | |
247 | delete f; | |
248 | } | |
2a103154 | 249 | |
65aa45f2 | 250 | // |
251 | // Energy Density | |
252 | // | |
253 | fgWEnergyDensity = new TF1("WEnergyDensity", WEnergyDensity, 0., 2. * fWSr0, 1); | |
254 | fgWEnergyDensity->SetParameter(0, fWSr0 + 1.); | |
255 | ||
256 | // | |
257 | // Geometrical Cross-Section | |
258 | // | |
259 | fgWSgeo = new TF1("WSgeo", WSgeo, 0., fgBMax, 1); | |
260 | fgWSgeo->SetParameter(0,fSigmaNN); //mbarn | |
261 | fgWSgeo->SetNpx(100); | |
2a103154 | 262 | |
65aa45f2 | 263 | // |
264 | // Hard cross section (binary collisions) | |
265 | // | |
266 | fgWSbinary = new TF1("WSbinary", WSbinary, 0., fgBMax, 1); | |
267 | fgWSbinary->SetParameter(0, fSigmaHard); //mbarn | |
268 | fgWSbinary->SetNpx(100); | |
1bc228f5 | 269 | |
65aa45f2 | 270 | // |
271 | // Hard collisions per event | |
272 | // | |
273 | fgWSN = new TF1("WSN", WSN, 0., fgBMax, 1); | |
274 | fgWSN->SetNpx(100); | |
275 | ||
276 | // | |
277 | // Almond shaped interaction region | |
278 | // | |
279 | fgWAlmond = new TF2("WAlmond", WAlmond, -fgBMax, fgBMax, -fgBMax, fgBMax, 1); | |
280 | fgWAlmond->SetParameter(0, 0.); | |
281 | fgWAlmond->SetNpx(200); | |
282 | fgWAlmond->SetNpy(200); | |
283 | ||
284 | if(mode==2) { | |
285 | Info("Init","Reading interaction almonds from file: %s",fName.Data()); | |
286 | Char_t almondName[100]; | |
287 | TFile* ff = new TFile(fName.Data()); | |
288 | for(Int_t k=0; k<40; k++) { | |
289 | sprintf(almondName,"WAlmondFixedB%d",k); | |
290 | fgWAlmondCurrent = (TF2*)ff->Get(almondName); | |
7f2f270b | 291 | fgWAlmondFixedB[k] = fgWAlmondCurrent; |
5b3a5a5d | 292 | } |
65aa45f2 | 293 | delete ff; |
294 | } | |
295 | ||
296 | fgWIntRadius = new TF1("WIntRadius", WIntRadius, 0., fgBMax, 1); | |
297 | fgWIntRadius->SetParameter(0, 0.); | |
298 | ||
299 | // | |
300 | // Path Length as a function of Phi | |
301 | // | |
302 | fgWPathLength0 = new TF1("WPathLength0", WPathLength0, -TMath::Pi(), TMath::Pi(), 2); | |
303 | fgWPathLength0->SetParameter(0, 0.); | |
304 | fgWPathLength0->SetParameter(1, 0.); //Pathlength definition | |
305 | ||
306 | fgWPathLength = new TF1("WPathLength", WPathLength, -TMath::Pi(), TMath::Pi(), 3); | |
307 | fgWPathLength->SetParameter(0, 0.); //Impact Parameter | |
308 | fgWPathLength->SetParameter(1, 1000.); //Number of interactions used for average | |
309 | fgWPathLength->SetParameter(2, 0); //Pathlength definition | |
310 | } | |
311 | ||
a42548b0 | 312 | void AliFastGlauber::Reset() const |
65aa45f2 | 313 | { |
314 | // | |
315 | // Reset dynamic allocated formulas | |
316 | // in case init is called twice | |
317 | ||
318 | if(fgWSb) delete fgWSb; | |
319 | if(fgWSbz) delete fgWSbz; | |
320 | if(fgWSz) delete fgWSz; | |
321 | if(fgWSta) delete fgWSta; | |
322 | if(fgWStarfi) delete fgWStarfi; | |
323 | if(fgWAlmond) delete fgWAlmond; | |
324 | if(fgWStaa) delete fgWStaa; | |
325 | if(fgWSgeo) delete fgWSgeo; | |
326 | if(fgWSbinary) delete fgWSbinary; | |
327 | if(fgWSN) delete fgWSN; | |
328 | if(fgWPathLength0) delete fgWPathLength0; | |
329 | if(fgWPathLength) delete fgWPathLength; | |
330 | if(fgWEnergyDensity) delete fgWEnergyDensity; | |
331 | if(fgWIntRadius) delete fgWIntRadius; | |
332 | if(fgWKParticipants) delete fgWKParticipants; | |
333 | if(fgWParticipants) delete fgWParticipants; | |
5b3a5a5d | 334 | } |
335 | ||
710a8d90 | 336 | void AliFastGlauber::DrawWSb() const |
5b3a5a5d | 337 | { |
65aa45f2 | 338 | // |
339 | // Draw Wood-Saxon Nuclear Density Function | |
340 | // | |
341 | TCanvas *c1 = new TCanvas("c1","Wood Saxon",400,10,600,700); | |
342 | c1->cd(); | |
343 | Double_t max=fgWSb->GetMaximum(0,fgBMax)*1.01; | |
344 | 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); | |
345 | h2f->SetStats(0); | |
346 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
347 | h2f->GetYaxis()->SetNoExponent(kTRUE); | |
348 | h2f->GetYaxis()->SetTitle("#rho [fm^{-3}]"); | |
349 | h2f->Draw(); | |
350 | fgWSb->Draw("same"); | |
351 | TLegend *l1a = new TLegend(0.45,0.6,.90,0.8); | |
352 | l1a->SetFillStyle(0); | |
353 | l1a->SetBorderSize(0); | |
354 | Char_t label[100]; | |
355 | sprintf(label,"r_{0} = %.2f fm",fWSr0); | |
356 | l1a->AddEntry(fgWSb,label,""); | |
357 | sprintf(label,"d = %.2f fm",fWSd); | |
358 | l1a->AddEntry(fgWSb,label,""); | |
359 | sprintf(label,"n = %.2e fm^{-3}",fWSn); | |
360 | l1a->AddEntry(fgWSb,label,""); | |
361 | sprintf(label,"#omega = %.2f",fWSw); | |
362 | l1a->AddEntry(fgWSb,label,""); | |
363 | l1a->Draw(); | |
364 | c1->Update(); | |
5b3a5a5d | 365 | } |
366 | ||
710a8d90 | 367 | void AliFastGlauber::DrawOverlap() const |
5b3a5a5d | 368 | { |
65aa45f2 | 369 | // |
370 | // Draw Overlap Function | |
371 | // | |
372 | TCanvas *c2 = new TCanvas("c2","Overlap",400,10,600,700); | |
373 | c2->cd(); | |
374 | Double_t max=fgWStaa->GetMaximum(0,fgBMax)*1.01; | |
a42548b0 | 375 | TH2F *h2f=new TH2F("h2ftaa","Overlap function: T_{AB} [mbarn^{-1}]",2,0,fgBMax,2,0, max); |
65aa45f2 | 376 | h2f->SetStats(0); |
377 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
378 | h2f->GetYaxis()->SetTitle("T_{AB} [mbarn^{-1}]"); | |
379 | h2f->Draw(); | |
380 | fgWStaa->Draw("same"); | |
5b3a5a5d | 381 | } |
382 | ||
710a8d90 | 383 | void AliFastGlauber::DrawParticipants() const |
1bc228f5 | 384 | { |
65aa45f2 | 385 | // |
386 | // Draw Number of Participants Npart | |
387 | // | |
388 | TCanvas *c3 = new TCanvas("c3","Participants",400,10,600,700); | |
389 | c3->cd(); | |
390 | Double_t max=fgWParticipants->GetMaximum(0,fgBMax)*1.01; | |
391 | TH2F *h2f=new TH2F("h2fpart","Number of Participants",2,0,fgBMax,2,0,max); | |
392 | h2f->SetStats(0); | |
393 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
394 | h2f->GetYaxis()->SetTitle("N_{part}"); | |
395 | h2f->Draw(); | |
396 | fgWParticipants->Draw("same"); | |
397 | TLegend *l1a = new TLegend(0.50,0.75,.90,0.9); | |
398 | l1a->SetFillStyle(0); | |
399 | l1a->SetBorderSize(0); | |
400 | Char_t label[100]; | |
401 | sprintf(label,"#sigma^{inel.}_{NN} = %.1f mbarn",fSigmaNN); | |
402 | l1a->AddEntry(fgWParticipants,label,""); | |
403 | l1a->Draw(); | |
404 | c3->Update(); | |
1bc228f5 | 405 | } |
406 | ||
710a8d90 | 407 | void AliFastGlauber::DrawThickness() const |
5b3a5a5d | 408 | { |
65aa45f2 | 409 | // |
410 | // Draw Thickness Function | |
411 | // | |
412 | TCanvas *c4 = new TCanvas("c4","Thickness",400,10,600,700); | |
413 | c4->cd(); | |
414 | Double_t max=fgWSta->GetMaximum(0,fgBMax)*1.01; | |
415 | TH2F *h2f=new TH2F("h2fta","Thickness function: T_{A} [fm^{-2}]",2,0,fgBMax,2,0,max); | |
416 | h2f->SetStats(0); | |
417 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
418 | h2f->GetYaxis()->SetTitle("T_{A} [fm^{-2}]"); | |
419 | h2f->Draw(); | |
420 | fgWSta->Draw("same"); | |
5b3a5a5d | 421 | } |
422 | ||
710a8d90 | 423 | void AliFastGlauber::DrawGeo() const |
5b3a5a5d | 424 | { |
65aa45f2 | 425 | // |
426 | // Draw Geometrical Cross-Section | |
427 | // | |
428 | TCanvas *c5 = new TCanvas("c5","Geometrical Cross-Section",400,10,600,700); | |
429 | c5->cd(); | |
430 | Double_t max=fgWSgeo->GetMaximum(0,fgBMax)*1.01; | |
431 | TH2F *h2f=new TH2F("h2fgeo","Differential Geometrical Cross-Section: d#sigma^{geo}_{AB}/db [fm]",2,0,fgBMax,2,0,max); | |
432 | h2f->SetStats(0); | |
433 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
434 | h2f->GetYaxis()->SetTitle("d#sigma^{geo}_{AB}/db [fm]"); | |
435 | h2f->Draw(); | |
436 | fgWSgeo->Draw("same"); | |
437 | TLegend *l1a = new TLegend(0.10,0.8,.40,0.9); | |
438 | l1a->SetFillStyle(0); | |
439 | l1a->SetBorderSize(0); | |
440 | Char_t label[100]; | |
441 | sprintf(label,"#sigma_{NN}^{inel.} = %.1f mbarn",fSigmaNN); | |
442 | l1a->AddEntry(fgWSgeo,label,""); | |
443 | l1a->Draw(); | |
444 | c5->Update(); | |
5b3a5a5d | 445 | } |
446 | ||
710a8d90 | 447 | void AliFastGlauber::DrawBinary() const |
5b3a5a5d | 448 | { |
65aa45f2 | 449 | // |
450 | // Draw Binary Cross-Section | |
451 | // | |
452 | TCanvas *c6 = new TCanvas("c6","Binary Cross-Section",400,10,600,700); | |
453 | c6->cd(); | |
454 | Double_t max=fgWSbinary->GetMaximum(0,fgBMax)*1.01; | |
455 | TH2F *h2f=new TH2F("h2fbinary","Differential Binary Cross-Section: #sigma^{hard}_{NN} dT_{AB}/db [fm]",2,0,fgBMax,2,0,max); | |
456 | h2f->SetStats(0); | |
457 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
458 | h2f->GetYaxis()->SetTitle("d#sigma^{hard}_{AB}/db [fm]"); | |
459 | h2f->Draw(); | |
460 | fgWSbinary->Draw("same"); | |
461 | TLegend *l1a = new TLegend(0.50,0.8,.90,0.9); | |
462 | l1a->SetFillStyle(0); | |
463 | l1a->SetBorderSize(0); | |
464 | Char_t label[100]; | |
465 | sprintf(label,"#sigma_{NN}^{hard} = %.1f mbarn",fSigmaHard); | |
466 | l1a->AddEntry(fgWSb,label,""); | |
467 | l1a->Draw(); | |
468 | c6->Update(); | |
5b3a5a5d | 469 | } |
470 | ||
710a8d90 | 471 | void AliFastGlauber::DrawN() const |
5b3a5a5d | 472 | { |
65aa45f2 | 473 | // |
474 | // Draw Binaries per event (Ncoll) | |
475 | // | |
476 | TCanvas *c7 = new TCanvas("c7","Binaries per event",400,10,600,700); | |
477 | c7->cd(); | |
478 | Double_t max=fgWSN->GetMaximum(0,fgBMax)*1.01; | |
479 | TH2F *h2f=new TH2F("h2fhardcols","Number of hard collisions: T_{AB} #sigma^{hard}_{NN}/#sigma_{AB}^{geo}",2,0,fgBMax,2,0,max); | |
480 | h2f->SetStats(0); | |
481 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
482 | h2f->GetYaxis()->SetTitle("N_{coll}"); | |
483 | h2f->Draw(); | |
484 | fgWSN->Draw("same"); | |
485 | TLegend *l1a = new TLegend(0.50,0.75,.90,0.9); | |
486 | l1a->SetFillStyle(0); | |
487 | l1a->SetBorderSize(0); | |
488 | Char_t label[100]; | |
489 | sprintf(label,"#sigma^{hard}_{NN} = %.1f mbarn",fSigmaHard); | |
490 | l1a->AddEntry(fgWSN,label,""); | |
491 | sprintf(label,"#sigma^{inel.}_{NN} = %.1f mbarn",fSigmaNN); | |
492 | l1a->AddEntry(fgWSN,label,""); | |
493 | l1a->Draw(); | |
494 | c7->Update(); | |
5b3a5a5d | 495 | } |
496 | ||
710a8d90 | 497 | void AliFastGlauber::DrawKernel(Double_t b) const |
5b3a5a5d | 498 | { |
65aa45f2 | 499 | // |
500 | // Draw Kernel | |
501 | // | |
502 | TCanvas *c8 = new TCanvas("c8","Kernel",400,10,600,700); | |
503 | c8->cd(); | |
504 | fgWStarfi->SetParameter(0, b); | |
505 | 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()); | |
506 | h2f->SetStats(0); | |
507 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
508 | h2f->GetYaxis()->SetTitle("#phi [rad]"); | |
509 | h2f->Draw(); | |
510 | fgWStarfi->Draw("same"); | |
511 | TLegend *l1a = new TLegend(0.65,0.8,.90,0.9); | |
512 | l1a->SetFillStyle(0); | |
513 | l1a->SetBorderSize(0); | |
514 | Char_t label[100]; | |
a0e187b1 | 515 | sprintf(label,"b = %.1f fm",b); |
65aa45f2 | 516 | l1a->AddEntry(fgWStarfi,label,""); |
517 | l1a->Draw(); | |
518 | c8->Update(); | |
5b3a5a5d | 519 | } |
520 | ||
710a8d90 | 521 | void AliFastGlauber::DrawAlmond(Double_t b) const |
f3a04204 | 522 | { |
65aa45f2 | 523 | // |
524 | // Draw Interaction Almond | |
525 | // | |
526 | TCanvas *c9 = new TCanvas("c9","Almond",400,10,600,700); | |
527 | c9->cd(); | |
528 | fgWAlmond->SetParameter(0, b); | |
529 | TH2F *h2f=new TH2F("h2falmond","Interaction Almond [fm^{-4}]",2,0,fgBMax,2,0,fgBMax); | |
530 | h2f->SetStats(0); | |
531 | h2f->GetXaxis()->SetTitle("x [fm]"); | |
532 | h2f->GetYaxis()->SetTitle("y [fm]"); | |
533 | h2f->Draw(); | |
534 | fgWAlmond->Draw("same"); | |
535 | TLegend *l1a = new TLegend(0.65,0.8,.90,0.9); | |
536 | l1a->SetFillStyle(0); | |
537 | l1a->SetBorderSize(0); | |
538 | Char_t label[100]; | |
a0e187b1 | 539 | sprintf(label,"b = %.1f fm",b); |
65aa45f2 | 540 | l1a->AddEntry(fgWAlmond,label,""); |
541 | l1a->Draw(); | |
542 | c9->Update(); | |
f3a04204 | 543 | } |
544 | ||
710a8d90 | 545 | void AliFastGlauber::DrawEnergyDensity() const |
f3a04204 | 546 | { |
65aa45f2 | 547 | // |
548 | // Draw energy density | |
549 | // | |
550 | TCanvas *c10 = new TCanvas("c10","Energy Density",400, 10, 600, 700); | |
551 | c10->cd(); | |
552 | fgWEnergyDensity->SetMinimum(0.); | |
553 | Double_t max=fgWEnergyDensity->GetMaximum(0,fgWEnergyDensity->GetParameter(0))*1.01; | |
554 | TH2F *h2f=new TH2F("h2fenergydens","Energy density",2,0,fgBMax,2,0,max); | |
555 | h2f->SetStats(0); | |
556 | h2f->GetXaxis()->SetTitle("b [fm]"); | |
557 | h2f->GetYaxis()->SetTitle("fm^{-4}"); | |
558 | h2f->Draw(); | |
559 | fgWEnergyDensity->Draw("same"); | |
560 | c10->Update(); | |
f3a04204 | 561 | } |
562 | ||
710a8d90 | 563 | void AliFastGlauber::DrawPathLength0(Double_t b, Int_t iopt) const |
f3a04204 | 564 | { |
65aa45f2 | 565 | // |
566 | // Draw Path Length | |
567 | // | |
568 | TCanvas *c11 = new TCanvas("c11","Path Length",400,10,600,700); | |
569 | c11->cd(); | |
570 | fgWPathLength0->SetParameter(0, b); | |
571 | fgWPathLength0->SetParameter(1, Double_t(iopt)); | |
572 | fgWPathLength0->SetMinimum(0.); | |
573 | fgWPathLength0->SetMaximum(10.); | |
574 | TH2F *h2f=new TH2F("h2fpathlength0","Path length",2,-TMath::Pi(), TMath::Pi(),2,0,10.); | |
575 | h2f->SetStats(0); | |
576 | h2f->GetXaxis()->SetTitle("#phi [rad]"); | |
577 | h2f->GetYaxis()->SetTitle("l [fm]"); | |
578 | h2f->Draw(); | |
579 | fgWPathLength0->Draw("same"); | |
f3a04204 | 580 | } |
581 | ||
710a8d90 | 582 | void AliFastGlauber::DrawPathLength(Double_t b , Int_t ni, Int_t iopt) const |
f3a04204 | 583 | { |
65aa45f2 | 584 | // |
585 | // Draw Path Length | |
586 | // | |
587 | TCanvas *c12 = new TCanvas("c12","Path Length",400,10,600,700); | |
588 | c12->cd(); | |
589 | fgWAlmond->SetParameter(0, b); | |
590 | fgWPathLength->SetParameter(0, b); | |
591 | fgWPathLength->SetParameter(1, Double_t (ni)); | |
592 | fgWPathLength->SetParameter(2, Double_t (iopt)); | |
593 | fgWPathLength->SetMinimum(0.); | |
594 | fgWPathLength->SetMaximum(10.); | |
595 | TH2F *h2f=new TH2F("h2fpathlength","Path length",2,-TMath::Pi(), TMath::Pi(),2,0,10.); | |
596 | h2f->SetStats(0); | |
597 | h2f->GetXaxis()->SetTitle("#phi [rad]"); | |
598 | h2f->GetYaxis()->SetTitle("l [fm]"); | |
599 | h2f->Draw(); | |
600 | fgWPathLength->Draw("same"); | |
f3a04204 | 601 | } |
602 | ||
710a8d90 | 603 | void AliFastGlauber::DrawIntRadius(Double_t b) const |
2a103154 | 604 | { |
65aa45f2 | 605 | // |
606 | // Draw Interaction Radius | |
607 | // | |
608 | TCanvas *c13 = new TCanvas("c13","Interaction Radius",400,10,600,700); | |
609 | c13->cd(); | |
610 | fgWIntRadius->SetParameter(0, b); | |
611 | fgWIntRadius->SetMinimum(0); | |
612 | Double_t max=fgWIntRadius->GetMaximum(0,fgBMax)*1.01; | |
613 | TH2F *h2f=new TH2F("h2fintradius","Interaction Density",2,0.,fgBMax,2,0,max); | |
614 | h2f->SetStats(0); | |
615 | h2f->GetXaxis()->SetTitle("r [fm]"); | |
616 | h2f->GetYaxis()->SetTitle("[fm^{-3}]"); | |
617 | h2f->Draw(); | |
618 | fgWIntRadius->Draw("same"); | |
2a103154 | 619 | } |
620 | ||
5b3a5a5d | 621 | Double_t AliFastGlauber::WSb(Double_t* x, Double_t* par) |
622 | { | |
65aa45f2 | 623 | // |
624 | // Woods-Saxon Parameterisation | |
625 | // as a function of radius (xx) | |
626 | // | |
710a8d90 | 627 | const Double_t kxx = x[0]; //fm |
628 | const Double_t kr0 = par[0]; //fm | |
629 | const Double_t kd = par[1]; //fm | |
630 | const Double_t kw = par[2]; //no units | |
631 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
632 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 633 | return y; //fm^-3 |
5b3a5a5d | 634 | } |
635 | ||
636 | Double_t AliFastGlauber::WSbz(Double_t* x, Double_t* par) | |
637 | { | |
65aa45f2 | 638 | // |
639 | // Wood Saxon Parameterisation | |
640 | // as a function of z and b | |
641 | // | |
710a8d90 | 642 | const Double_t kbb = x[0]; //fm |
643 | const Double_t kzz = x[1]; //fm | |
644 | const Double_t kr0 = par[0]; //fm | |
645 | const Double_t kd = par[1]; //fm | |
646 | const Double_t kw = par[2]; //no units | |
647 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
648 | const Double_t kxx = TMath::Sqrt(kbb*kbb+kzz*kzz); | |
649 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 650 | return y; //fm^-3 |
5b3a5a5d | 651 | } |
652 | ||
653 | Double_t AliFastGlauber::WSz(Double_t* x, Double_t* par) | |
654 | { | |
65aa45f2 | 655 | // |
656 | // Wood Saxon Parameterisation | |
657 | // as a function of z for fixed b | |
658 | // | |
710a8d90 | 659 | const Double_t kzz = x[0]; //fm |
660 | const Double_t kr0 = par[0]; //fm | |
661 | const Double_t kd = par[1]; //fm | |
662 | const Double_t kw = par[2]; //no units | |
663 | const Double_t kn = par[3]; //fm^-3 (used to normalize integral to one) | |
664 | const Double_t kbb = par[4]; //fm | |
665 | const Double_t kxx = TMath::Sqrt(kbb*kbb+kzz*kzz); | |
666 | Double_t y = kn * (1.+kw*(kxx/kr0)*(kxx/kr0))/(1.+TMath::Exp((kxx-kr0)/kd)); | |
65aa45f2 | 667 | return y; //fm^-3 |
5b3a5a5d | 668 | } |
669 | ||
f86dad79 | 670 | Double_t AliFastGlauber::WSta(Double_t* x, Double_t* /*par*/) |
5b3a5a5d | 671 | { |
65aa45f2 | 672 | // |
673 | // Thickness function T_A | |
674 | // as a function of b | |
675 | // | |
710a8d90 | 676 | const Double_t kb = x[0]; |
677 | fgWSz->SetParameter(4, kb); | |
678 | Double_t y = 2. * fgWSz->Integral(0., fgBMax); | |
65aa45f2 | 679 | return y; //fm^-2 |
5b3a5a5d | 680 | } |
681 | ||
5b3a5a5d | 682 | Double_t AliFastGlauber::WStarfi(Double_t* x, Double_t* par) |
683 | { | |
65aa45f2 | 684 | // |
685 | // Kernel for overlap function: T_A(s)*T_A(s-b) | |
686 | // as a function of r and phi | |
710a8d90 | 687 | const Double_t kr1 = x[0]; |
688 | const Double_t kphi = x[1]; | |
689 | const Double_t kb = par[0]; | |
690 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
691 | Double_t y = kr1 * fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 692 | return y; //fm^-3 |
693 | } | |
694 | ||
695 | Double_t AliFastGlauber::WStaa(Double_t* x, Double_t* par) | |
696 | { | |
697 | // | |
698 | // Overlap function | |
699 | // T_{AB}=Int d2s T_A(s)*T_B(s-b) | |
700 | // as a function of b | |
701 | // (normalized to fA*fB) | |
702 | // | |
710a8d90 | 703 | const Double_t kb = x[0]; |
704 | const Double_t ka = par[0]; | |
705 | fgWStarfi->SetParameter(0, kb); | |
65aa45f2 | 706 | |
707 | // root integration seems to fail | |
708 | /* | |
709 | Double_t al[2]; | |
710 | Double_t bl[2]; | |
711 | al[0] = 1e-6; | |
712 | al[1] = fgBMax; | |
713 | bl[0] = 0.; | |
714 | bl[1] = TMath::Pi(); | |
715 | Double_t err; | |
716 | ||
717 | Double_t y = 2. * 208. * 208. * fgWStarfi->IntegralMultiple(2, al, bl, 0.001, err); | |
718 | printf("WStaa: %.5e %.5e %.5e\n", b, y, err); | |
719 | */ | |
720 | ||
721 | // | |
722 | // MC Integration | |
723 | // | |
724 | Double_t y = 0; | |
a42548b0 | 725 | |
726 | ||
65aa45f2 | 727 | for (Int_t i = 0; i < fgkMCInts; i++) |
728 | { | |
a42548b0 | 729 | |
710a8d90 | 730 | const Double_t kphi = TMath::Pi() * gRandom->Rndm(); |
731 | const Double_t kb1 = fgBMax * gRandom->Rndm(); | |
732 | y += fgWStarfi->Eval(kb1, kphi); | |
65aa45f2 | 733 | } |
734 | y *= 2. * TMath::Pi() * fgBMax / fgkMCInts; //fm^-2 | |
710a8d90 | 735 | y *= ka * ka * 0.1; //mbarn^-1 |
65aa45f2 | 736 | return y; |
5b3a5a5d | 737 | } |
738 | ||
1bc228f5 | 739 | Double_t AliFastGlauber::WKParticipants(Double_t* x, Double_t* par) |
740 | { | |
65aa45f2 | 741 | // |
742 | // Kernel for number of participants | |
743 | // as a function of r and phi | |
744 | // | |
710a8d90 | 745 | const Double_t kr1 = x[0]; |
746 | const Double_t kphi = x[1]; | |
747 | const Double_t kb = par[0]; //fm | |
748 | const Double_t ksig = par[1]; //mbarn | |
749 | const Double_t ka = par[2]; //mass number | |
750 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 +kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
751 | const Double_t kxsi = fgWSta->Eval(kr2) * ksig * 0.1; //no units | |
65aa45f2 | 752 | /* |
710a8d90 | 753 | Double_t y=(1-TMath::Power((1-xsi),aa)) |
65aa45f2 | 754 | */ |
710a8d90 | 755 | Double_t a = ka; |
756 | Double_t sum = ka * kxsi; | |
65aa45f2 | 757 | Double_t y = sum; |
710a8d90 | 758 | for (Int_t i = 1; i <= ka; i++) |
1bc228f5 | 759 | { |
65aa45f2 | 760 | a--; |
710a8d90 | 761 | sum *= (-kxsi) * a / Float_t(i+1); |
65aa45f2 | 762 | y += sum; |
1bc228f5 | 763 | } |
710a8d90 | 764 | y *= kr1 * fgWSta->Eval(kr1); |
65aa45f2 | 765 | return y; //fm^-1 |
1bc228f5 | 766 | } |
767 | ||
65aa45f2 | 768 | Double_t AliFastGlauber::WParticipants(Double_t* x, Double_t* par) |
769 | { | |
770 | // | |
771 | // Number of Participants as | |
772 | // a function of b | |
773 | // | |
710a8d90 | 774 | const Double_t kb = x[0]; |
775 | const Double_t ksig = par[0]; //mbarn | |
776 | const Double_t ka = par[1]; //mass number | |
777 | fgWKParticipants->SetParameter(0, kb); | |
778 | fgWKParticipants->SetParameter(1, ksig); | |
779 | fgWKParticipants->SetParameter(2, ka); | |
65aa45f2 | 780 | |
781 | // | |
782 | // MC Integration | |
783 | // | |
784 | Double_t y = 0; | |
785 | for (Int_t i = 0; i < fgkMCInts; i++) | |
786 | { | |
710a8d90 | 787 | const Double_t kphi = TMath::Pi() * gRandom->Rndm(); |
788 | const Double_t kb1 = fgBMax * gRandom->Rndm(); | |
789 | y += fgWKParticipants->Eval(kb1, kphi); | |
65aa45f2 | 790 | } |
710a8d90 | 791 | y *= 2. * ka * 2. * TMath::Pi() * fgBMax / fgkMCInts; |
65aa45f2 | 792 | return y; //no units |
793 | } | |
794 | ||
795 | Double_t AliFastGlauber::WSgeo(Double_t* x, Double_t* par) | |
796 | { | |
797 | // | |
798 | // Geometrical Cross-Section | |
799 | // as a function of b | |
800 | // | |
710a8d90 | 801 | const Double_t kb = x[0]; //fm |
802 | const Double_t ksigNN = par[0]; //mbarn | |
803 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
804 | Double_t y = 2. * TMath::Pi() * kb * (1. - TMath::Exp(- ksigNN * ktaa)); | |
65aa45f2 | 805 | return y; //fm |
806 | } | |
807 | ||
808 | Double_t AliFastGlauber::WSbinary(Double_t* x, Double_t* par) | |
809 | { | |
810 | // | |
710a8d90 | 811 | // Number of binary hard collisions |
65aa45f2 | 812 | // as a function of b |
813 | // | |
710a8d90 | 814 | const Double_t kb = x[0]; //fm |
815 | const Double_t ksig = par[0]; //mbarn | |
816 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
817 | Double_t y = 2. * TMath::Pi() * kb * ksig * ktaa; | |
65aa45f2 | 818 | return y; //fm |
819 | } | |
820 | ||
821 | Double_t AliFastGlauber::WSN(Double_t* x, Double_t* /*par*/) | |
822 | { | |
823 | // | |
824 | // Number of hard processes per event | |
825 | // as a function of b | |
710a8d90 | 826 | const Double_t kb = x[0]; |
827 | Double_t y = fgWSbinary->Eval(kb)/fgWSgeo->Eval(kb); | |
65aa45f2 | 828 | return y; //no units |
829 | } | |
830 | ||
831 | Double_t AliFastGlauber::WEnergyDensity(Double_t* x, Double_t* par) | |
832 | { | |
833 | // | |
834 | // Initial energy density | |
835 | // as a function of the impact parameter | |
836 | // | |
710a8d90 | 837 | const Double_t kb = x[0]; |
838 | const Double_t krA = par[0]; | |
65aa45f2 | 839 | // |
840 | // Attention: area of transverse reaction zone in hard-sphere approximation ! | |
710a8d90 | 841 | const Double_t krA2=krA*krA; |
842 | const Double_t kb2=kb*kb; | |
843 | const Double_t ksaa = (TMath::Pi() - 2. * TMath::ASin(kb/ 2./ krA)) * krA2 | |
844 | - kb * TMath::Sqrt(krA2 - kb2/ 4.); //fm^2 | |
845 | const Double_t ktaa = fgWStaa->Eval(kb); //mbarn^-1 | |
846 | Double_t y=ktaa/ksaa*10; | |
65aa45f2 | 847 | return y; //fm^-4 |
848 | } | |
5b3a5a5d | 849 | |
f3a04204 | 850 | Double_t AliFastGlauber::WAlmond(Double_t* x, Double_t* par) |
851 | { | |
65aa45f2 | 852 | // |
853 | // Almond shaped interaction region | |
854 | // as a function of cartesian x,y. | |
855 | // | |
710a8d90 | 856 | const Double_t kb = par[0]; |
857 | const Double_t kxx = x[0] + kb/2.; | |
858 | const Double_t kyy = x[1]; | |
859 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
860 | const Double_t kphi = TMath::ATan2(kyy,kxx); | |
861 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); | |
65aa45f2 | 862 | // |
863 | // Interaction probability calculated as product of thicknesses | |
864 | // | |
710a8d90 | 865 | Double_t y = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); |
65aa45f2 | 866 | return y; //fm^-4 |
f3a04204 | 867 | } |
868 | ||
869 | Double_t AliFastGlauber::WIntRadius(Double_t* x, Double_t* par) | |
870 | { | |
65aa45f2 | 871 | // |
872 | // Average interaction density over radius | |
873 | // at which interaction takes place | |
874 | // as a function of radius | |
875 | // | |
710a8d90 | 876 | const Double_t kr = x[0]; |
877 | const Double_t kb = par[0]; | |
878 | fgWAlmond->SetParameter(0, kb); | |
65aa45f2 | 879 | // Average over phi in small steps |
710a8d90 | 880 | const Double_t kdphi = 2. * TMath::Pi() / 100.; |
65aa45f2 | 881 | Double_t phi = 0.; |
882 | Double_t y = 0.; | |
883 | for (Int_t i = 0; i < 100; i++) { | |
710a8d90 | 884 | const Double_t kxx = kr * TMath::Cos(phi); |
885 | const Double_t kyy = kr * TMath::Sin(phi); | |
886 | y += fgWAlmond->Eval(kxx,kyy); | |
887 | phi += kdphi; | |
65aa45f2 | 888 | } // phi loop |
889 | // Result multiplied by Jacobian (2 pi r) | |
710a8d90 | 890 | y *= 2. * TMath::Pi() * kr / 100.; |
65aa45f2 | 891 | return y; //fm^-3 |
f3a04204 | 892 | } |
893 | ||
894 | Double_t AliFastGlauber::WPathLength0(Double_t* x, Double_t* par) | |
895 | { | |
65aa45f2 | 896 | // |
897 | // Path Length as a function of phi | |
898 | // for interaction point fixed at (0,0) | |
899 | // as a function of phi-direction | |
900 | // | |
901 | // Phi direction in Almond | |
710a8d90 | 902 | const Double_t kphi0 = x[0]; |
903 | const Double_t kb = par[0]; | |
65aa45f2 | 904 | // Path Length definition |
710a8d90 | 905 | const Int_t kiopt = Int_t(par[1]); |
65aa45f2 | 906 | |
907 | // Step along radial direction phi | |
908 | const Int_t kNp = 100; // Steps in r | |
909 | const Double_t kDr = fgBMax/kNp; | |
910 | Double_t r = 0.; | |
911 | Double_t rw = 0.; | |
912 | Double_t w = 0.; | |
913 | for (Int_t i = 0; i < kNp; i++) { | |
914 | // | |
915 | // Transform into target frame | |
916 | // | |
710a8d90 | 917 | const Double_t kxx = r * TMath::Cos(kphi0) + kb / 2.; |
918 | const Double_t kyy = r * TMath::Sin(kphi0); | |
919 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
920 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 921 | // Radius in projectile frame |
710a8d90 | 922 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); |
923 | const Double_t ky = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 924 | |
710a8d90 | 925 | rw += ky * r; |
926 | w += ky; | |
65aa45f2 | 927 | r += kDr; |
928 | } // radial steps | |
929 | ||
930 | Double_t y=0.; | |
ed79c723 | 931 | if (!kiopt) { // My length definition (is exact for hard disk) |
932 | if(w) y= 2. * rw / w; | |
933 | } else { | |
934 | const Double_t knorm=fgWSta->Eval(1e-4); | |
935 | if(knorm) y = TMath::Sqrt(2. * rw * kDr / knorm / knorm); | |
65aa45f2 | 936 | } |
937 | return y; //fm | |
938 | } | |
939 | ||
940 | Double_t AliFastGlauber::WPathLength(Double_t* x, Double_t* par) | |
941 | { | |
942 | // | |
943 | // Path Length as a function of phi | |
944 | // Interaction point from random distribution | |
945 | // as a function of the phi-direction | |
710a8d90 | 946 | const Double_t kphi0 = x[0]; |
947 | const Double_t kb = par[0]; | |
948 | fgWAlmond->SetParameter(0, kb); | |
949 | const Int_t kNpi = Int_t (par[1]); //Number of interactions | |
950 | const Int_t kiopt = Int_t(par[2]); //Path Length definition | |
65aa45f2 | 951 | |
952 | // | |
953 | // r-steps | |
954 | // | |
955 | const Int_t kNp = 100; | |
956 | const Double_t kDr = fgBMax/Double_t(kNp); | |
957 | Double_t l = 0.; // Path length | |
958 | for (Int_t in = 0; in < kNpi; in ++) { | |
f3a04204 | 959 | Double_t rw = 0.; |
960 | Double_t w = 0.; | |
65aa45f2 | 961 | // Interaction point |
962 | Double_t x0, y0; | |
963 | fgWAlmond->GetRandom2(x0, y0); | |
964 | // Initial radius | |
710a8d90 | 965 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
966 | const Int_t knps = Int_t ((fgBMax - kr0)/kDr) - 1; | |
f3a04204 | 967 | |
65aa45f2 | 968 | // Radial steps |
969 | Double_t r = 0.; | |
710a8d90 | 970 | for (Int_t i = 0; (i < knps ); i++) { |
65aa45f2 | 971 | // Transform into target frame |
710a8d90 | 972 | const Double_t kxx = x0 + r * TMath::Cos(kphi0) + kb / 2.; |
973 | const Double_t kyy = y0 + r * TMath::Sin(kphi0); | |
974 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
975 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 976 | // Radius in projectile frame |
710a8d90 | 977 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + kb*kb - 2.*kr1*kb*TMath::Cos(kphi)); |
978 | const Double_t ky = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
65aa45f2 | 979 | |
710a8d90 | 980 | rw += ky * r; |
981 | w += ky; | |
65aa45f2 | 982 | r += kDr; |
983 | } // steps | |
984 | // Average over interactions | |
710a8d90 | 985 | if (!kiopt) { |
65aa45f2 | 986 | if(w) l += (2. * rw / w); |
8de7e046 | 987 | } else { |
710a8d90 | 988 | const Double_t knorm=fgWSta->Eval(1e-4); |
989 | if(knorm) l+= 2. * rw * kDr / knorm / knorm; | |
8de7e046 | 990 | } |
65aa45f2 | 991 | } // interactions |
992 | Double_t ret=0; | |
710a8d90 | 993 | if (!kiopt) |
65aa45f2 | 994 | ret= l / kNpi; |
995 | else | |
996 | ret=TMath::Sqrt( l / kNpi); | |
997 | return ret; //fm | |
f3a04204 | 998 | } |
999 | ||
710a8d90 | 1000 | Double_t AliFastGlauber::CrossSection(Double_t b1, Double_t b2) const |
f3a04204 | 1001 | { |
65aa45f2 | 1002 | // |
1003 | // Return the geometrical cross-section integrated from b1 to b2 | |
1004 | // | |
1005 | return fgWSgeo->Integral(b1, b2)*10.; //mbarn | |
1006 | } | |
f3a04204 | 1007 | |
710a8d90 | 1008 | Double_t AliFastGlauber::HardCrossSection(Double_t b1, Double_t b2) const |
5b3a5a5d | 1009 | { |
65aa45f2 | 1010 | // |
1011 | // Return the hard cross-section integrated from b1 to b2 | |
1012 | // | |
1013 | return fgWSbinary->Integral(b1, b2)*10.; //mbarn | |
5b3a5a5d | 1014 | } |
1015 | ||
710a8d90 | 1016 | Double_t AliFastGlauber::FractionOfHardCrossSection(Double_t b1, Double_t b2) const |
1bc228f5 | 1017 | { |
65aa45f2 | 1018 | // |
148c5ce5 | 1019 | // Return fraction of hard cross-section integrated from b1 to b2 |
65aa45f2 | 1020 | // |
1021 | return fgWSbinary->Integral(b1, b2)/fgWSbinary->Integral(0., 100.); | |
1bc228f5 | 1022 | } |
1023 | ||
f762082f | 1024 | Double_t AliFastGlauber::NHard(Double_t b1, Double_t b2) const |
1025 | { | |
1026 | // | |
1027 | // Number of binary hard collisions | |
1028 | // as a function of b (nucl/ex/0302016 eq. 19) | |
1029 | // | |
1030 | const Double_t kshard=HardCrossSection(b1,b2); | |
1031 | const Double_t ksgeo=CrossSection(b1,b2); | |
1032 | if(ksgeo>0) | |
1033 | return kshard/ksgeo; | |
1034 | else return -1; | |
1035 | } | |
1036 | ||
710a8d90 | 1037 | Double_t AliFastGlauber::Binaries(Double_t b) const |
5b3a5a5d | 1038 | { |
65aa45f2 | 1039 | // |
710a8d90 | 1040 | // Return number of binary hard collisions normalized to 1 at b=0 |
65aa45f2 | 1041 | // |
1042 | if(b==0) b=1e-4; | |
1043 | return fgWSN->Eval(b)/fgWSN->Eval(1e-4); | |
5b3a5a5d | 1044 | } |
1045 | ||
a42548b0 | 1046 | Double_t AliFastGlauber::MeanOverlap(Double_t b1, Double_t b2) |
1047 | { | |
1048 | // | |
1049 | // Calculate the mean overlap for impact parameter range b1 .. b2 | |
1050 | // | |
1051 | Double_t sum = 0.; | |
1052 | Double_t sumc = 0.; | |
1053 | Double_t b = b1; | |
1054 | ||
1055 | while (b < b2-0.005) { | |
1056 | Double_t nc = GetNumberOfCollisions(b); | |
1057 | sum += 10. * fgWStaa->Eval(b) * fgWSgeo->Eval(b) * 0.01 / (1. - TMath::Exp(-nc)); | |
1058 | sumc += 10. * fgWSgeo->Eval(b) * 0.01; | |
1059 | b += 0.01; | |
1060 | } | |
1061 | return (sum / CrossSection(b1, b2)); | |
1062 | } | |
1063 | ||
1064 | ||
1065 | Double_t AliFastGlauber::MeanNumberOfCollisionsPerEvent(Double_t b1, Double_t b2) | |
1066 | { | |
1067 | // | |
1068 | // Calculate the mean number of collisions per event for impact parameter range b1 .. b2 | |
1069 | // | |
1070 | Double_t sum = 0.; | |
1071 | Double_t sumc = 0.; | |
1072 | Double_t b = b1; | |
1073 | ||
1074 | while (b < b2-0.005) { | |
1075 | Double_t nc = GetNumberOfCollisions(b); | |
1076 | sum += nc / (1. - TMath::Exp(-nc)) * 10. * fgWSgeo->Eval(b) * 0.01; | |
1077 | sumc += 10. * fgWSgeo->Eval(b) * 0.01; | |
1078 | b += 0.01; | |
1079 | } | |
1080 | return (sum / CrossSection(b1, b2)); | |
1081 | } | |
1082 | ||
1083 | ||
710a8d90 | 1084 | Double_t AliFastGlauber::GetNumberOfBinaries(Double_t b) const |
5b3a5a5d | 1085 | { |
65aa45f2 | 1086 | // |
710a8d90 | 1087 | // Return number of binary hard collisions at b |
65aa45f2 | 1088 | // |
1089 | if(b==0) b=1e-4; | |
1090 | return fgWSN->Eval(b); | |
5b3a5a5d | 1091 | } |
1092 | ||
710a8d90 | 1093 | Double_t AliFastGlauber::Participants(Double_t b) const |
5b3a5a5d | 1094 | { |
65aa45f2 | 1095 | // |
1096 | // Return the number of participants normalized to 1 at b=0 | |
1097 | // | |
1098 | if(b==0) b=1e-4; | |
1099 | return (fgWParticipants->Eval(b)/fgWParticipants->Eval(1e-4)); | |
5b3a5a5d | 1100 | } |
1101 | ||
710a8d90 | 1102 | Double_t AliFastGlauber::GetNumberOfParticipants(Double_t b) const |
2a103154 | 1103 | { |
65aa45f2 | 1104 | // |
1105 | // Return the number of participants for impact parameter b | |
1106 | // | |
1107 | if(b==0) b=1e-4; | |
1108 | return (fgWParticipants->Eval(b)); | |
2a103154 | 1109 | } |
1110 | ||
710a8d90 | 1111 | Double_t AliFastGlauber::GetNumberOfCollisions(Double_t b) const |
1112 | { | |
1113 | // | |
1114 | // Return the number of collisions for impact parameter b | |
1115 | // | |
1116 | if(b==0) b=1e-4; | |
1117 | return (fgWStaa->Eval(b)*fSigmaNN); | |
1118 | } | |
1119 | ||
148c5ce5 | 1120 | Double_t AliFastGlauber::GetNumberOfCollisionsPerEvent(Double_t b) const |
1121 | { | |
1122 | // | |
1123 | // Return the number of collisions per event (at least one collision) | |
1124 | // for impact parameter b | |
1125 | // | |
1126 | Double_t n = GetNumberOfCollisions(b); | |
1127 | if (n > 0.) { | |
1128 | return (n / (1. - TMath::Exp(- n))); | |
1129 | } else { | |
1130 | return (0.); | |
1131 | } | |
1132 | } | |
1133 | ||
5b3a5a5d | 1134 | void AliFastGlauber::SimulateTrigger(Int_t n) |
1135 | { | |
65aa45f2 | 1136 | // |
1137 | // Simulates Trigger | |
1138 | // | |
1139 | TH1F* mbtH = new TH1F("mbtH", "MB Trigger b-Distribution", 100, 0., 20.); | |
1140 | TH1F* hdtH = new TH1F("hdtH", "Hard Trigger b-Distribution", 100, 0., 20.); | |
1141 | TH1F* mbmH = new TH1F("mbmH", "MB Trigger Multiplicity Distribution", 100, 0., 8000.); | |
1142 | TH1F* hdmH = new TH1F("hdmH", "Hard Trigger Multiplicity Distribution", 100, 0., 8000.); | |
5b3a5a5d | 1143 | |
65aa45f2 | 1144 | mbtH->SetXTitle("b [fm]"); |
1145 | hdtH->SetXTitle("b [fm]"); | |
1146 | mbmH->SetXTitle("Multiplicity"); | |
1147 | hdmH->SetXTitle("Multiplicity"); | |
5b3a5a5d | 1148 | |
65aa45f2 | 1149 | TCanvas *c0 = new TCanvas("c0","Trigger Simulation",400,10,600,700); |
1150 | c0->Divide(2,1); | |
1151 | TCanvas *c1 = new TCanvas("c1","Trigger Simulation",400,10,600,700); | |
1152 | c1->Divide(1,2); | |
5b3a5a5d | 1153 | |
65aa45f2 | 1154 | // |
1155 | // | |
1156 | Init(1); | |
1157 | for (Int_t iev = 0; iev < n; iev++) | |
5b3a5a5d | 1158 | { |
65aa45f2 | 1159 | Float_t b, p, mult; |
1160 | GetRandom(b, p, mult); | |
1161 | mbtH->Fill(b,1.); | |
1162 | hdtH->Fill(b, p); | |
1163 | mbmH->Fill(mult, 1.); | |
1164 | hdmH->Fill(mult, p); | |
1165 | ||
1166 | c0->cd(1); | |
1167 | mbtH->Draw(); | |
1168 | c0->cd(2); | |
1169 | hdtH->Draw(); | |
1170 | c0->Update(); | |
1171 | ||
1172 | c1->cd(1); | |
1173 | mbmH->Draw(); | |
1174 | c1->cd(2); | |
1175 | hdmH->Draw(); | |
1176 | c1->Update(); | |
5b3a5a5d | 1177 | } |
1178 | } | |
1179 | ||
1180 | void AliFastGlauber::GetRandom(Float_t& b, Float_t& p, Float_t& mult) | |
1181 | { | |
65aa45f2 | 1182 | // |
1183 | // Gives back a random impact parameter, hard trigger probability and multiplicity | |
1184 | // | |
1185 | b = fgWSgeo->GetRandom(); | |
710a8d90 | 1186 | const Float_t kmu = fgWSN->Eval(b); |
1187 | p = 1.-TMath::Exp(-kmu); | |
1188 | mult = 6000./fgWSN->Eval(1.) * kmu; | |
5b3a5a5d | 1189 | } |
1190 | ||
c2140715 | 1191 | void AliFastGlauber::GetRandom(Int_t& bin, Bool_t& hard) |
1192 | { | |
65aa45f2 | 1193 | // |
1194 | // Gives back a random impact parameter bin, and hard trigger decission | |
1195 | // | |
710a8d90 | 1196 | const Float_t kb = fgWSgeo->GetRandom(); |
1197 | const Float_t kmu = fgWSN->Eval(kb) * fSigmaHard; | |
1198 | const Float_t kp = 1.-TMath::Exp(-kmu); | |
1199 | if (kb < 5.) { | |
65aa45f2 | 1200 | bin = 1; |
710a8d90 | 1201 | } else if (kb < 8.6) { |
65aa45f2 | 1202 | bin = 2; |
710a8d90 | 1203 | } else if (kb < 11.2) { |
65aa45f2 | 1204 | bin = 3; |
710a8d90 | 1205 | } else if (kb < 13.2) { |
65aa45f2 | 1206 | bin = 4; |
710a8d90 | 1207 | } else if (kb < 15.0) { |
65aa45f2 | 1208 | bin = 5; |
1209 | } else { | |
1210 | bin = 6; | |
1211 | } | |
1212 | hard = kFALSE; | |
710a8d90 | 1213 | const Float_t kr = gRandom->Rndm(); |
1214 | if (kr < kp) hard = kTRUE; | |
c2140715 | 1215 | } |
1216 | ||
65aa45f2 | 1217 | Double_t AliFastGlauber::GetRandomImpactParameter(Double_t bmin, Double_t bmax) |
5b3a5a5d | 1218 | { |
65aa45f2 | 1219 | // |
1220 | // Gives back a random impact parameter in the range bmin .. bmax | |
1221 | // | |
1222 | Float_t b = -1.; | |
1223 | while(b < bmin || b > bmax) | |
1224 | b = fgWSgeo->GetRandom(); | |
1225 | return b; | |
5b3a5a5d | 1226 | } |
1227 | ||
710a8d90 | 1228 | void AliFastGlauber::StoreFunctions() const |
5b3a5a5d | 1229 | { |
65aa45f2 | 1230 | // |
1231 | // Store in file functions | |
1232 | // | |
1233 | TFile* ff = new TFile(fName.Data(),"recreate"); | |
1234 | fgWStaa->Write("WStaa"); | |
1235 | fgWParticipants->Write("WParticipants"); | |
1236 | ff->Close(); | |
1237 | return; | |
5b3a5a5d | 1238 | } |
1239 | ||
65aa45f2 | 1240 | //=================== Added by A. Dainese 11/02/04 =========================== |
1bc228f5 | 1241 | |
710a8d90 | 1242 | void AliFastGlauber::StoreAlmonds() const |
5b3a5a5d | 1243 | { |
65aa45f2 | 1244 | // |
1245 | // Store in file | |
1246 | // 40 almonds for b = (0.25+k*0.5) fm (k=0->39) | |
1247 | // | |
1248 | Char_t almondName[100]; | |
1249 | TFile* ff = new TFile(fName.Data(),"update"); | |
1250 | for(Int_t k=0; k<40; k++) { | |
1251 | sprintf(almondName,"WAlmondFixedB%d",k); | |
1252 | Double_t b = 0.25+k*0.5; | |
1253 | Info("StoreAlmonds"," b = %f\n",b); | |
1254 | fgWAlmond->SetParameter(0,b); | |
1255 | fgWAlmond->Write(almondName); | |
1256 | } | |
1257 | ff->Close(); | |
1258 | return; | |
5b3a5a5d | 1259 | } |
a2f2f511 | 1260 | |
a2f2f511 | 1261 | void AliFastGlauber::SetCentralityClass(Double_t xsecFrLow,Double_t xsecFrUp) |
1262 | { | |
1263 | // | |
65aa45f2 | 1264 | // Set limits of centrality class as fractions |
1265 | // of the geomtrical cross section | |
a2f2f511 | 1266 | // |
1267 | if(xsecFrLow>1. || xsecFrUp>1. || xsecFrLow>xsecFrUp) { | |
65aa45f2 | 1268 | Error("SetCentralityClass", "Please set 0 <= xsecFrLow <= xsecFrUp <= 1\n"); |
a2f2f511 | 1269 | return; |
1270 | } | |
1271 | ||
1272 | Double_t bLow=0.,bUp=0.; | |
1273 | Double_t xsecFr=0.; | |
710a8d90 | 1274 | const Double_t knorm=fgWSgeo->Integral(0.,100.); |
a2f2f511 | 1275 | while(xsecFr<xsecFrLow) { |
710a8d90 | 1276 | xsecFr = fgWSgeo->Integral(0.,bLow)/knorm; |
a2f2f511 | 1277 | bLow += 0.1; |
1278 | } | |
1279 | bUp = bLow; | |
1280 | while(xsecFr<xsecFrUp) { | |
710a8d90 | 1281 | xsecFr = fgWSgeo->Integral(0.,bUp)/knorm; |
a2f2f511 | 1282 | bUp += 0.1; |
1283 | } | |
1284 | ||
710a8d90 | 1285 | Info("SetCentralityClass", "Centrality class: %4.2f-%4.2f; %4.1f < b < %4.1f fm", |
a2f2f511 | 1286 | xsecFrLow,xsecFrUp,bLow,bUp); |
a2f2f511 | 1287 | fgWSbinary->SetRange(bLow,bUp); |
710a8d90 | 1288 | fBmin=bLow; |
1289 | fBmax=bUp; | |
a2f2f511 | 1290 | return; |
1291 | } | |
1292 | ||
1293 | void AliFastGlauber::GetRandomBHard(Double_t& b) | |
1294 | { | |
1295 | // | |
1296 | // Get random impact parameter according to distribution of | |
1297 | // hard (binary) cross-section, in the range defined by the centrality class | |
1298 | // | |
1299 | b = fgWSbinary->GetRandom(); | |
1300 | Int_t bin = 2*(Int_t)b; | |
1301 | if( (b-(Int_t)b) > 0.5) bin++; | |
7f2f270b | 1302 | fgWAlmondCurrent = fgWAlmondFixedB[bin]; |
a2f2f511 | 1303 | return; |
1304 | } | |
1305 | ||
1306 | void AliFastGlauber::GetRandomXY(Double_t& x,Double_t& y) | |
1307 | { | |
1308 | // | |
1309 | // Get random position of parton production point according to | |
1310 | // product of thickness functions | |
1311 | // | |
65aa45f2 | 1312 | fgWAlmondCurrent->GetRandom2(x,y); |
a2f2f511 | 1313 | return; |
1314 | } | |
1315 | ||
1316 | void AliFastGlauber::GetRandomPhi(Double_t& phi) | |
1317 | { | |
1318 | // | |
1319 | // Get random parton azimuthal propagation direction | |
1320 | // | |
1321 | phi = 2.*TMath::Pi()*gRandom->Rndm(); | |
1322 | return; | |
1323 | } | |
1324 | ||
65aa45f2 | 1325 | Double_t AliFastGlauber::CalculateLength(Double_t b,Double_t x0,Double_t y0,Double_t phi0) |
a2f2f511 | 1326 | { |
1327 | // | |
1328 | // Calculate path length for a parton with production point (x0,y0) | |
1329 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
1330 | // in a collision with impact parameter b | |
1331 | // | |
1332 | ||
1333 | // number of steps in l | |
1334 | const Int_t kNp = 100; | |
1335 | const Double_t kDl = fgBMax/Double_t(kNp); | |
1336 | ||
a2f2f511 | 1337 | if(fEllDef==1) { |
1338 | // | |
1339 | // Definition 1: | |
1340 | // | |
65aa45f2 | 1341 | // ell = 2 * \int_0^\infty dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) / |
1342 | // \int_0^\infty dl*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
a2f2f511 | 1343 | // |
a2f2f511 | 1344 | |
a2f2f511 | 1345 | // Initial radius |
710a8d90 | 1346 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
1347 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
65aa45f2 | 1348 | Double_t l = 0.; |
1349 | Double_t integral1 = 0.; | |
1350 | Double_t integral2 = 0.; | |
a2f2f511 | 1351 | // Radial steps |
710a8d90 | 1352 | for (Int_t i = 0; i < knps; i++) { |
a2f2f511 | 1353 | |
1354 | // Transform into target frame | |
710a8d90 | 1355 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1356 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1357 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1358 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
a2f2f511 | 1359 | // Radius in projectile frame |
710a8d90 | 1360 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1361 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
a2f2f511 | 1362 | |
710a8d90 | 1363 | integral1 += kprodTATB * l * kDl; |
1364 | integral2 += kprodTATB * kDl; | |
a2f2f511 | 1365 | l += kDl; |
1366 | } // steps | |
1367 | ||
65aa45f2 | 1368 | Double_t ell=0.; |
1369 | if(integral2) | |
1370 | ell = (2. * integral1 / integral2); | |
a2f2f511 | 1371 | return ell; |
a2f2f511 | 1372 | } else if(fEllDef==2) { |
1373 | // | |
1374 | // Definition 2: | |
1375 | // | |
1376 | // ell = \int_0^\infty dl* | |
65aa45f2 | 1377 | // \Theta((T_A*T_B)(x0+l*ux,y0+l*uy)-0.5*(T_A*T_B)(0,0)) |
a2f2f511 | 1378 | // |
1379 | ||
a2f2f511 | 1380 | // Initial radius |
710a8d90 | 1381 | const Double_t kr0 = TMath::Sqrt(x0*x0 + y0*y0); |
1382 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
1383 | const Double_t kprodTATBHalfMax = 0.5*fgWAlmondCurrent->Eval(0.,0.); | |
a2f2f511 | 1384 | // Radial steps |
65aa45f2 | 1385 | Double_t l = 0.; |
1386 | Double_t integral = 0.; | |
710a8d90 | 1387 | for (Int_t i = 0; i < knps; i++) { |
a2f2f511 | 1388 | // Transform into target frame |
710a8d90 | 1389 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1390 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1391 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1392 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
a2f2f511 | 1393 | // Radius in projectile frame |
710a8d90 | 1394 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1395 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
1396 | if(kprodTATB>kprodTATBHalfMax) integral += kDl; | |
a2f2f511 | 1397 | l += kDl; |
1398 | } // steps | |
65aa45f2 | 1399 | Double_t ell = integral; |
a2f2f511 | 1400 | return ell; |
a2f2f511 | 1401 | } else { |
65aa45f2 | 1402 | Error("CalculateLength","Wrong length definition setting: %d !\n",fEllDef); |
a2f2f511 | 1403 | return -1.; |
1404 | } | |
1405 | } | |
1406 | ||
83f67d08 | 1407 | void AliFastGlauber::GetLengthAndPhi(Double_t& ell,Double_t& phi,Double_t b) |
a2f2f511 | 1408 | { |
1409 | // | |
1410 | // Return length from random b, x0, y0, phi0 | |
83f67d08 | 1411 | // Return also phi0 |
a2f2f511 | 1412 | // |
1413 | Double_t x0,y0,phi0; | |
1414 | if(b<0.) GetRandomBHard(b); | |
1415 | GetRandomXY(x0,y0); | |
1416 | GetRandomPhi(phi0); | |
83f67d08 | 1417 | phi = phi0; |
a2f2f511 | 1418 | ell = CalculateLength(b,x0,y0,phi0); |
a2f2f511 | 1419 | return; |
1420 | } | |
1421 | ||
83f67d08 | 1422 | void AliFastGlauber::GetLength(Double_t& ell,Double_t b) |
a2f2f511 | 1423 | { |
1424 | // | |
83f67d08 | 1425 | // Return length from random b, x0, y0, phi0 |
a2f2f511 | 1426 | // |
83f67d08 | 1427 | Double_t phi; |
1428 | GetLengthAndPhi(ell,phi,b); | |
1429 | return; | |
1430 | } | |
1431 | ||
1432 | void AliFastGlauber::GetLengthsBackToBackAndPhi(Double_t& ell1,Double_t& ell2,Double_t &phi,Double_t b) | |
1433 | { | |
1434 | // | |
1435 | // Return 2 lengths back to back from random b, x0, y0, phi0 | |
1436 | // Return also phi0 | |
1437 | // | |
a2f2f511 | 1438 | Double_t x0,y0,phi0; |
1439 | if(b<0.) GetRandomBHard(b); | |
1440 | GetRandomXY(x0,y0); | |
1441 | GetRandomPhi(phi0); | |
710a8d90 | 1442 | const Double_t kphi0plusPi = phi0+TMath::Pi(); |
83f67d08 | 1443 | phi = phi0; |
a2f2f511 | 1444 | ell1 = CalculateLength(b,x0,y0,phi0); |
710a8d90 | 1445 | ell2 = CalculateLength(b,x0,y0,kphi0plusPi); |
a2f2f511 | 1446 | return; |
1447 | } | |
1448 | ||
83f67d08 | 1449 | void AliFastGlauber::GetLengthsBackToBack(Double_t& ell1,Double_t& ell2, |
1450 | Double_t b) | |
1451 | { | |
1452 | // | |
1453 | // Return 2 lengths back to back from random b, x0, y0, phi0 | |
1454 | // | |
1455 | Double_t phi; | |
1456 | GetLengthsBackToBackAndPhi(ell1,ell2,phi,b); | |
1457 | return; | |
1458 | } | |
1459 | ||
1bc228f5 | 1460 | void AliFastGlauber::GetLengthsForPythia(Int_t n,Double_t* phi,Double_t* ell, Double_t b) |
a2f2f511 | 1461 | { |
1462 | // | |
1463 | // Returns lenghts for n partons with azimuthal angles phi[n] | |
1464 | // from random b, x0, y0 | |
1465 | // | |
1bc228f5 | 1466 | Double_t x0, y0; |
1467 | if(b < 0.) GetRandomBHard(b); | |
a2f2f511 | 1468 | GetRandomXY(x0,y0); |
1bc228f5 | 1469 | for(Int_t i = 0; i< n; i++) ell[i] = CalculateLength(b,x0,y0,phi[i]); |
a2f2f511 | 1470 | return; |
1471 | } | |
1472 | ||
1473 | void AliFastGlauber::PlotBDistr(Int_t n) | |
65aa45f2 | 1474 | { |
a2f2f511 | 1475 | // |
1476 | // Plot distribution of n impact parameters | |
1477 | // | |
1478 | Double_t b; | |
1479 | TH1F *hB = new TH1F("hB","dN/db",100,0,fgBMax); | |
1480 | hB->SetXTitle("b [fm]"); | |
1481 | hB->SetYTitle("dN/db [a.u.]"); | |
1482 | hB->SetFillColor(3); | |
a2f2f511 | 1483 | for(Int_t i=0; i<n; i++) { |
1484 | GetRandomBHard(b); | |
1485 | hB->Fill(b); | |
1486 | } | |
a2f2f511 | 1487 | TCanvas *cB = new TCanvas("cB","Impact parameter distribution",0,0,500,500); |
1488 | cB->cd(); | |
1489 | hB->Draw(); | |
a2f2f511 | 1490 | return; |
1491 | } | |
1492 | ||
d3d4a92f | 1493 | void AliFastGlauber::PlotLengthDistr(Int_t n,Bool_t save,const char *fname) |
a2f2f511 | 1494 | { |
1495 | // | |
1496 | // Plot length distribution | |
1497 | // | |
1498 | Double_t ell; | |
710a8d90 | 1499 | TH1F *hEll = new TH1F("hEll","Length distribution",64,-0.5,15); |
a2f2f511 | 1500 | hEll->SetXTitle("Transverse path length, L [fm]"); |
1501 | hEll->SetYTitle("Probability"); | |
1502 | hEll->SetFillColor(2); | |
a2f2f511 | 1503 | for(Int_t i=0; i<n; i++) { |
1504 | GetLength(ell); | |
1505 | hEll->Fill(ell); | |
1506 | } | |
1507 | hEll->Scale(1/(Double_t)n); | |
a2f2f511 | 1508 | TCanvas *cL = new TCanvas("cL","Length distribution",0,0,500,500); |
1509 | cL->cd(); | |
1510 | hEll->Draw(); | |
1511 | ||
1512 | if(save) { | |
1513 | TFile *f = new TFile(fname,"recreate"); | |
1514 | hEll->Write(); | |
1515 | f->Close(); | |
1516 | } | |
1517 | return; | |
1518 | } | |
1519 | ||
d3d4a92f | 1520 | void AliFastGlauber::PlotLengthB2BDistr(Int_t n,Bool_t save,const char *fname) |
a2f2f511 | 1521 | { |
1522 | // | |
1523 | // Plot lengths back-to-back distributions | |
1524 | // | |
1525 | Double_t ell1,ell2; | |
1526 | TH2F *hElls = new TH2F("hElls","Lengths back-to-back",100,0,15,100,0,15); | |
1527 | hElls->SetXTitle("Transverse path length, L [fm]"); | |
1528 | hElls->SetYTitle("Transverse path length, L [fm]"); | |
a2f2f511 | 1529 | for(Int_t i=0; i<n; i++) { |
1530 | GetLengthsBackToBack(ell1,ell2); | |
1531 | hElls->Fill(ell1,ell2); | |
1532 | } | |
1533 | hElls->Scale(1/(Double_t)n); | |
a2f2f511 | 1534 | TCanvas *cLs = new TCanvas("cLs","Length back-to-back distribution",0,0,500,500); |
1535 | gStyle->SetPalette(1,0); | |
1536 | cLs->cd(); | |
1537 | hElls->Draw("col,Z"); | |
a2f2f511 | 1538 | if(save) { |
1539 | TFile *f = new TFile(fname,"recreate"); | |
1540 | hElls->Write(); | |
1541 | f->Close(); | |
1542 | } | |
1543 | return; | |
1544 | } | |
1545 | ||
710a8d90 | 1546 | void AliFastGlauber::PlotAlmonds() const |
1547 | { | |
1548 | // | |
1549 | // Plot almonds for some impact parameters | |
1550 | // | |
1551 | TCanvas *c = new TCanvas("c","Almonds",0,0,500,500); | |
1552 | gStyle->SetPalette(1,0); | |
1553 | c->Divide(2,2); | |
1554 | c->cd(1); | |
7f2f270b | 1555 | fgWAlmondFixedB[0]->Draw("cont1"); |
710a8d90 | 1556 | c->cd(2); |
7f2f270b | 1557 | fgWAlmondFixedB[10]->Draw("cont1"); |
710a8d90 | 1558 | c->cd(3); |
7f2f270b | 1559 | fgWAlmondFixedB[20]->Draw("cont1"); |
710a8d90 | 1560 | c->cd(4); |
7f2f270b | 1561 | fgWAlmondFixedB[30]->Draw("cont1"); |
710a8d90 | 1562 | return; |
1563 | } | |
1564 | ||
65aa45f2 | 1565 | //=================== Added by A. Dainese 05/03/04 =========================== |
1566 | ||
1567 | void AliFastGlauber::CalculateI0I1(Double_t& integral0,Double_t& integral1, | |
1568 | Double_t b,Double_t x0,Double_t y0, | |
710a8d90 | 1569 | Double_t phi0,Double_t ellCut) const |
a2f2f511 | 1570 | { |
65aa45f2 | 1571 | // |
1572 | // Calculate integrals: | |
e9663638 | 1573 | // integral0 = \int_0^ellCut dl*(T_A*T_B)(x0+l*ux,y0+l*uy) |
1574 | // integral1 = \int_0^ellCut dl*l*(T_A*T_B)(x0+l*ux,y0+l*uy) | |
a2f2f511 | 1575 | // |
65aa45f2 | 1576 | // for a parton with production point (x0,y0) |
1577 | // and propagation direction (ux=cos(phi0),uy=sin(phi0)) | |
1578 | // in a collision with impact parameter b | |
1579 | // | |
1580 | ||
1581 | // number of steps in l | |
1582 | const Int_t kNp = 100; | |
1583 | const Double_t kDl = fgBMax/Double_t(kNp); | |
1584 | ||
1585 | // Initial radius | |
710a8d90 | 1586 | const Double_t kr0 = TMath::Sqrt(x0 * x0 + y0 * y0); |
1587 | const Int_t knps = Int_t ((fgBMax - kr0)/kDl) - 1; | |
65aa45f2 | 1588 | |
1589 | // Radial steps | |
1590 | Double_t l = 0.; | |
1591 | integral0 = 0.; | |
1592 | integral1 = 0.; | |
1593 | Int_t i = 0; | |
710a8d90 | 1594 | while((i < knps) && (l < ellCut)) { |
65aa45f2 | 1595 | // Transform into target frame |
710a8d90 | 1596 | const Double_t kxx = x0 + l * TMath::Cos(phi0) + b / 2.; |
1597 | const Double_t kyy = y0 + l * TMath::Sin(phi0); | |
1598 | const Double_t kphi = TMath::ATan2(kyy, kxx); | |
1599 | const Double_t kr1 = TMath::Sqrt(kxx*kxx + kyy*kyy); | |
65aa45f2 | 1600 | // Radius in projectile frame |
710a8d90 | 1601 | const Double_t kr2 = TMath::Sqrt(kr1*kr1 + b*b - 2.*kr1*b*TMath::Cos(kphi)); |
1602 | const Double_t kprodTATB = fgWSta->Eval(kr1) * fgWSta->Eval(kr2); | |
1603 | integral0 += kprodTATB * kDl; | |
1604 | integral1 += kprodTATB * l * kDl; | |
65aa45f2 | 1605 | l += kDl; |
1606 | i++; | |
1607 | } // steps | |
1608 | return; | |
1609 | } | |
1610 | ||
83f67d08 | 1611 | void AliFastGlauber::GetI0I1AndPhi(Double_t& integral0,Double_t& integral1, |
1612 | Double_t& phi, | |
1613 | Double_t ellCut,Double_t b) | |
65aa45f2 | 1614 | { |
a2f2f511 | 1615 | // |
65aa45f2 | 1616 | // Return I0 and I1 from random b, x0, y0, phi0 |
83f67d08 | 1617 | // Return also phi |
65aa45f2 | 1618 | // |
1619 | Double_t x0,y0,phi0; | |
1620 | if(b<0.) GetRandomBHard(b); | |
1621 | GetRandomXY(x0,y0); | |
1622 | GetRandomPhi(phi0); | |
83f67d08 | 1623 | phi = phi0; |
65aa45f2 | 1624 | CalculateI0I1(integral0,integral1,b,x0,y0,phi0,ellCut); |
1625 | return; | |
1626 | } | |
a2f2f511 | 1627 | |
83f67d08 | 1628 | void AliFastGlauber::GetI0I1(Double_t& integral0,Double_t& integral1, |
1629 | Double_t ellCut,Double_t b) | |
1630 | { | |
1631 | // | |
1632 | // Return I0 and I1 from random b, x0, y0, phi0 | |
1633 | // | |
1634 | Double_t phi; | |
1635 | GetI0I1AndPhi(integral0,integral1,phi,ellCut,b); | |
1636 | return; | |
1637 | } | |
1638 | ||
1639 | void AliFastGlauber::GetI0I1BackToBackAndPhi(Double_t& integral01,Double_t& integral11, | |
1640 | Double_t& integral02,Double_t& integral12, | |
1641 | Double_t& phi, | |
1642 | Double_t ellCut,Double_t b) | |
65aa45f2 | 1643 | { |
1644 | // | |
1645 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
83f67d08 | 1646 | // Return also phi0 |
65aa45f2 | 1647 | // |
1648 | Double_t x0,y0,phi0; | |
1649 | if(b<0.) GetRandomBHard(b); | |
1650 | GetRandomXY(x0,y0); | |
1651 | GetRandomPhi(phi0); | |
83f67d08 | 1652 | phi = phi0; |
710a8d90 | 1653 | const Double_t kphi0plusPi = phi0+TMath::Pi(); |
c54404bf | 1654 | CalculateI0I1(integral01,integral11,b,x0,y0,phi0,ellCut); |
1655 | CalculateI0I1(integral02,integral12,b,x0,y0,kphi0plusPi,ellCut); | |
1656 | return; | |
1657 | } | |
1658 | ||
1659 | void AliFastGlauber::GetI0I1BackToBackAndPhiAndXY(Double_t& integral01,Double_t& integral11, | |
1660 | Double_t& integral02,Double_t& integral12, | |
1661 | Double_t& phi,Double_t &x,Double_t &y, | |
1662 | Double_t ellCut,Double_t b) | |
1663 | { | |
1664 | // | |
1665 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
1666 | // Return also phi0 | |
1667 | // | |
1668 | Double_t x0,y0,phi0; | |
1669 | if(b<0.) GetRandomBHard(b); | |
1670 | GetRandomXY(x0,y0); | |
1671 | GetRandomPhi(phi0); | |
1672 | phi = phi0; x=x0; y=y0; | |
1673 | const Double_t kphi0plusPi = phi0+TMath::Pi(); | |
65aa45f2 | 1674 | CalculateI0I1(integral01,integral11,b,x0,y0,phi0,ellCut); |
710a8d90 | 1675 | CalculateI0I1(integral02,integral12,b,x0,y0,kphi0plusPi,ellCut); |
65aa45f2 | 1676 | return; |
1677 | } | |
a2f2f511 | 1678 | |
83f67d08 | 1679 | void AliFastGlauber::GetI0I1BackToBack(Double_t& integral01,Double_t& integral11, |
1680 | Double_t& integral02,Double_t& integral12, | |
1681 | Double_t ellCut,Double_t b) | |
1682 | { | |
1683 | // | |
1684 | // Return 2 pairs of I0 and I1 back to back from random b, x0, y0, phi0 | |
1685 | // | |
1686 | Double_t phi; | |
1687 | GetI0I1BackToBackAndPhi(integral01,integral11,integral02,integral12, | |
1688 | phi,ellCut,b); | |
1689 | return; | |
1690 | } | |
1691 | ||
65aa45f2 | 1692 | void AliFastGlauber::GetI0I1ForPythia(Int_t n,Double_t* phi, |
1693 | Double_t* integral0,Double_t* integral1, | |
1694 | Double_t ellCut,Double_t b) | |
1695 | { | |
1696 | // | |
1697 | // Returns I0 and I1 pairs for n partons with azimuthal angles phi[n] | |
1698 | // from random b, x0, y0 | |
1699 | // | |
1700 | Double_t x0,y0; | |
1701 | if(b<0.) GetRandomBHard(b); | |
1702 | GetRandomXY(x0,y0); | |
1703 | for(Int_t i=0; i<n; i++) | |
1704 | CalculateI0I1(integral0[i],integral1[i],b,x0,y0,phi[i],ellCut); | |
1705 | return; | |
1706 | } | |
1707 | ||
2e3b5c95 | 1708 | void AliFastGlauber::GetI0I1ForPythiaAndXY(Int_t n,Double_t* phi, |
1709 | Double_t* integral0,Double_t* integral1, | |
1710 | Double_t &x,Double_t& y, | |
1711 | Double_t ellCut,Double_t b) | |
1712 | { | |
1713 | // | |
1714 | // Returns I0 and I1 pairs for n partons with azimuthal angles phi[n] | |
1715 | // from random b, x0, y0 and return x0,y0 | |
1716 | // | |
1717 | Double_t x0,y0; | |
1718 | if(b<0.) GetRandomBHard(b); | |
1719 | GetRandomXY(x0,y0); | |
1720 | for(Int_t i=0; i<n; i++) | |
1721 | CalculateI0I1(integral0[i],integral1[i],b,x0,y0,phi[i],ellCut); | |
1722 | x=x0; | |
1723 | y=y0; | |
1724 | return; | |
1725 | } | |
1726 | ||
65aa45f2 | 1727 | void AliFastGlauber::PlotI0I1Distr(Int_t n,Double_t ellCut, |
d3d4a92f | 1728 | Bool_t save,const char *fname) |
65aa45f2 | 1729 | { |
1730 | // | |
bbf8513d | 1731 | // Plot I0-I1 distribution |
65aa45f2 | 1732 | // |
1733 | Double_t i0,i1; | |
bbf8513d | 1734 | TH2F *hI0I1s = new TH2F("hI0I1s","I_{0} versus I_{1}",1000,0,0.001,1000,0,0.01); |
1735 | hI0I1s->SetXTitle("I_{0} [fm^{-3}]"); | |
1736 | hI0I1s->SetYTitle("I_{1} [fm^{-2}]"); | |
1737 | ||
65aa45f2 | 1738 | TH1F *hI0 = new TH1F("hI0","I_{0} = #hat{q}L / k", |
bbf8513d | 1739 | 1000,0,0.001); |
65aa45f2 | 1740 | hI0->SetXTitle("I_{0} [fm^{-3}]"); |
1741 | hI0->SetYTitle("Probability"); | |
1742 | hI0->SetFillColor(3); | |
1743 | TH1F *hI1 = new TH1F("hI1","I_{1} = #omega_{c} / k", | |
bbf8513d | 1744 | 1000,0,0.01); |
65aa45f2 | 1745 | hI1->SetXTitle("I_{1} [fm^{-2}]"); |
1746 | hI1->SetYTitle("Probability"); | |
1747 | hI1->SetFillColor(4); | |
1748 | TH1F *h2 = new TH1F("h2","2 I_{1}^{2}/I_{0} = R / k", | |
1749 | 100,0,0.02); | |
1750 | h2->SetXTitle("2 I_{1}^{2}/I_{0} [fm^{-1}]"); | |
1751 | h2->SetYTitle("Probability"); | |
1752 | h2->SetFillColor(2); | |
1753 | TH1F *h3 = new TH1F("h3","2 I_{1}/I_{0} = L", | |
1754 | 100,0,15); | |
1755 | h3->SetXTitle("2 I_{1}/I_{0} [fm]"); | |
1756 | h3->SetYTitle("Probability"); | |
1757 | h3->SetFillColor(5); | |
1758 | TH1F *h4 = new TH1F("h4","I_{0}^{2}/(2 I_{1}) = #hat{q} / k", | |
1759 | 100,0,0.00015); | |
1760 | h4->SetXTitle("I_{0}^{2}/(2 I_{1}) [fm^{-4}]"); | |
1761 | h4->SetYTitle("Probability"); | |
1762 | h4->SetFillColor(7); | |
1763 | ||
1764 | for(Int_t i=0; i<n; i++) { | |
1765 | GetI0I1(i0,i1,ellCut); | |
bbf8513d | 1766 | hI0I1s->Fill(i0,i1); |
65aa45f2 | 1767 | hI0->Fill(i0); |
1768 | hI1->Fill(i1); | |
1769 | h2->Fill(2.*i1*i1/i0); | |
1770 | h3->Fill(2.*i1/i0); | |
1771 | h4->Fill(i0*i0/2./i1); | |
a2f2f511 | 1772 | } |
65aa45f2 | 1773 | hI0->Scale(1/(Double_t)n); |
1774 | hI1->Scale(1/(Double_t)n); | |
bbf8513d | 1775 | h2->Scale(1/(Double_t)n); |
1776 | h3->Scale(1/(Double_t)n); | |
1777 | h4->Scale(1/(Double_t)n); | |
1778 | hI0I1s->Scale(1/(Double_t)n); | |
65aa45f2 | 1779 | |
1780 | TCanvas *cI0I1 = new TCanvas("cI0I1","I0 and I1",0,0,900,700); | |
1781 | cI0I1->Divide(3,2); | |
1782 | cI0I1->cd(1); | |
1783 | hI0->Draw(); | |
1784 | cI0I1->cd(2); | |
1785 | hI1->Draw(); | |
1786 | cI0I1->cd(3); | |
1787 | h2->Draw(); | |
1788 | cI0I1->cd(4); | |
1789 | h3->Draw(); | |
1790 | cI0I1->cd(5); | |
1791 | h4->Draw(); | |
bbf8513d | 1792 | cI0I1->cd(6); |
1793 | gStyle->SetPalette(1,0); | |
1794 | hI0I1s->Draw("col,Z"); | |
a2f2f511 | 1795 | |
65aa45f2 | 1796 | if(save) { |
1797 | TFile *f = new TFile(fname,"recreate"); | |
bbf8513d | 1798 | hI0I1s->Write(); |
65aa45f2 | 1799 | hI0->Write(); |
1800 | hI1->Write(); | |
1801 | h2->Write(); | |
1802 | h3->Write(); | |
1803 | h4->Write(); | |
1804 | f->Close(); | |
1805 | } | |
a2f2f511 | 1806 | return; |
1807 | } | |
1808 | ||
65aa45f2 | 1809 | void AliFastGlauber::PlotI0I1B2BDistr(Int_t n,Double_t ellCut, |
d3d4a92f | 1810 | Bool_t save,const char *fname) |
a2f2f511 | 1811 | { |
1812 | // | |
bbf8513d | 1813 | // Plot I0-I1 back-to-back distributions |
a2f2f511 | 1814 | // |
65aa45f2 | 1815 | Double_t i01,i11,i02,i12; |
1816 | TH2F *hI0s = new TH2F("hI0s","I_{0}'s back-to-back",100,0,100,100,0,100); | |
1817 | hI0s->SetXTitle("I_{0} [fm^{-3}]"); | |
1818 | hI0s->SetYTitle("I_{0} [fm^{-3}]"); | |
1819 | TH2F *hI1s = new TH2F("hI1s","I_{1}'s back-to-back",100,0,100,100,0,100); | |
1820 | hI1s->SetXTitle("I_{1} [fm^{-2}]"); | |
1821 | hI1s->SetYTitle("I_{1} [fm^{-2}]"); | |
a2f2f511 | 1822 | |
65aa45f2 | 1823 | for(Int_t i=0; i<n; i++) { |
1824 | GetI0I1BackToBack(i01,i11,i02,i12,ellCut); | |
1825 | hI0s->Fill(i01,i02); | |
1826 | hI1s->Fill(i11,i12); | |
1827 | } | |
1828 | hI0s->Scale(1/(Double_t)n); | |
1829 | hI1s->Scale(1/(Double_t)n); | |
1830 | ||
1831 | TCanvas *cI0I1s = new TCanvas("cI0I1s","I0 and I1 back-to-back distributions",0,0,800,400); | |
a2f2f511 | 1832 | gStyle->SetPalette(1,0); |
65aa45f2 | 1833 | cI0I1s->Divide(2,1); |
1834 | cI0I1s->cd(1); | |
1835 | hI0s->Draw("col,Z"); | |
1836 | cI0I1s->cd(2); | |
1837 | hI1s->Draw("col,Z"); | |
a2f2f511 | 1838 | |
65aa45f2 | 1839 | if(save) { |
1840 | TFile *f = new TFile(fname,"recreate"); | |
1841 | hI0s->Write(); | |
1842 | hI1s->Write(); | |
1843 | f->Close(); | |
1844 | } | |
a2f2f511 | 1845 | return; |
1846 | } | |
710a8d90 | 1847 | |
a42548b0 | 1848 | AliFastGlauber& AliFastGlauber::operator=(const AliFastGlauber& rhs) |
1849 | { | |
1850 | // Assignment operator | |
1851 | rhs.Copy(*this); | |
1852 | return *this; | |
1853 | } | |
1854 | ||
1855 | void AliFastGlauber::Copy(TObject&) const | |
1856 | { | |
1857 | // | |
1858 | // Copy | |
1859 | // | |
1860 | Fatal("Copy","Not implemented!\n"); | |
1861 | } | |
1862 |