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