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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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | // | |
19 | // AliGenGeVSim is a class implementing GeVSim event generator. | |
20 | // | |
21 | // GeVSim is a simple Monte-Carlo event generator for testing detector and | |
22 | // algorythm performance especialy concerning flow and event-by-event studies | |
23 | // | |
24 | // In this event generator particles are generated from thermal distributions | |
25 | // without any dynamics and addicional constrains. Distribution parameters like | |
26 | // multiplicity, particle type yields, inverse slope parameters, flow coeficients | |
27 | // and expansion velocities are expleicite defined by the user. | |
28 | // | |
29 | // GeVSim contains four thermal distributions the same as | |
30 | // MevSim event generator developed for STAR experiment. | |
31 | // | |
32 | // In addition custom distributions can be used be the mean | |
33 | // either two dimensional formula (TF2), a two dimensional histogram or | |
34 | // two one dimensional histograms. | |
35 | // | |
36 | // Azimuthal distribution is deconvoluted from (Pt,Y) distribution | |
37 | // and is described by two Fourier coefficients representing | |
38 | // Directed and Elliptic flow. | |
39 | // | |
40 | //////////////////////////////////////////////////////////////////////////////// | |
41 | // | |
42 | // To apply flow to event ganerated by an arbitraly event generator | |
43 | // refer to AliGenAfterBurnerFlow class. | |
44 | // | |
45 | //////////////////////////////////////////////////////////////////////////////// | |
46 | // | |
47 | // For examples, parameters and testing macros refer to: | |
48 | // http:/home.cern.ch/radomski | |
49 | // | |
50 | // for more detailed description refer to ALICE NOTE | |
51 | // "GeVSim Monte-Carlo Event Generator" | |
52 | // S.Radosmki, P. Foka. | |
53 | // | |
54 | // Author: | |
55 | // Sylwester Radomski, | |
56 | // GSI, March 2002 | |
57 | // | |
58 | // S.Radomski@gsi.de | |
59 | // | |
60 | //////////////////////////////////////////////////////////////////////////////// | |
61 | // | |
62 | // Updated and revised: September 2002, S. Radomski, GSI | |
63 | // | |
64 | //////////////////////////////////////////////////////////////////////////////// | |
65 | ||
66 | ||
67 | #include <Riostream.h> | |
68 | #include <TCanvas.h> | |
69 | #include <TF1.h> | |
70 | #include <TF2.h> | |
71 | #include <TH1.h> | |
72 | #include <TH2.h> | |
73 | #include <TObjArray.h> | |
74 | #include <TPDGCode.h> | |
75 | #include <TParticle.h> | |
76 | #include <TROOT.h> | |
77 | ||
78 | ||
79 | #include "AliGeVSimParticle.h" | |
80 | #include "AliGenGeVSim.h" | |
81 | #include "AliGenGeVSimEventHeader.h" | |
82 | #include "AliGenerator.h" | |
83 | #include "AliRun.h" | |
84 | ||
85 | ||
86 | ClassImp(AliGenGeVSim) | |
87 | ||
88 | ////////////////////////////////////////////////////////////////////////////////// | |
89 | ||
90 | AliGenGeVSim::AliGenGeVSim() : | |
91 | AliGenerator(-1), | |
92 | fModel(0), | |
93 | fPsi(0), | |
94 | fIsMultTotal(kTRUE), | |
95 | fPtFormula(0), | |
96 | fYFormula(0), | |
97 | fPhiFormula(0), | |
98 | fCurrentForm(0), | |
99 | fPtYHist(0), | |
100 | fPartTypes(0) | |
101 | { | |
102 | // | |
103 | // Default constructor | |
104 | // | |
105 | ||
106 | for (Int_t i=0; i<4; i++) | |
107 | fPtYFormula[i] = 0; | |
108 | for (Int_t i=0; i<2; i++) | |
109 | fHist[i] = 0; | |
110 | } | |
111 | ||
112 | ////////////////////////////////////////////////////////////////////////////////// | |
113 | ||
114 | AliGenGeVSim::AliGenGeVSim(Float_t psi, Bool_t isMultTotal) | |
115 | : AliGenerator(-1), | |
116 | fModel(0), | |
117 | fPsi(psi), | |
118 | fIsMultTotal(isMultTotal), | |
119 | fPtFormula(0), | |
120 | fYFormula(0), | |
121 | fPhiFormula(0), | |
122 | fCurrentForm(0), | |
123 | fPtYHist(0), | |
124 | fPartTypes(0) | |
125 | { | |
126 | // | |
127 | // Standard Constructor. | |
128 | // | |
129 | // models - thermal model to be used: | |
130 | // 1 - deconvoluted pt and Y source | |
131 | // 2,3 - thermalized sphericaly symetric sources | |
132 | // 4 - thermalized source with expansion | |
133 | // 5 - custom model defined in TF2 object named "gevsimPtY" | |
134 | // 6 - custom model defined by two 1D histograms | |
135 | // 7 - custom model defined by 2D histogram | |
136 | // | |
137 | // psi - reaction plane in degrees | |
138 | // isMultTotal - multiplicity mode | |
139 | // kTRUE - total multiplicity (default) | |
140 | // kFALSE - dN/dY at midrapidity | |
141 | // | |
142 | ||
143 | // checking consistancy | |
144 | ||
145 | if (psi < 0 || psi > 360 ) | |
146 | Error ("AliGenGeVSim", "Reaction plane angle ( %d )out of range [0..360]", psi); | |
147 | ||
148 | fPsi = psi * TMath::Pi() / 180. ; | |
149 | fIsMultTotal = isMultTotal; | |
150 | ||
151 | // Initialization | |
152 | ||
153 | fPartTypes = new TObjArray(); | |
154 | InitFormula(); | |
155 | } | |
156 | ||
157 | ////////////////////////////////////////////////////////////////////////////////// | |
158 | ||
159 | AliGenGeVSim::~AliGenGeVSim() { | |
160 | // | |
161 | // Default Destructor | |
162 | // | |
163 | // Removes TObjArray keeping list of registered particle types | |
164 | // | |
165 | ||
166 | if (fPartTypes != NULL) delete fPartTypes; | |
167 | } | |
168 | ||
169 | ||
170 | ////////////////////////////////////////////////////////////////////////////////// | |
171 | ||
172 | Bool_t AliGenGeVSim::CheckPtYPhi(Float_t pt, Float_t y, Float_t phi) const { | |
173 | // | |
174 | // private function used by Generate() | |
175 | // | |
176 | // Check bounds of Pt, Rapidity and Azimuthal Angle of a track | |
177 | // Used only when generating particles from a histogram | |
178 | // | |
179 | ||
180 | if ( TestBit(kPtRange) && ( pt < fPtMin || pt > fPtMax )) return kFALSE; | |
181 | if ( TestBit(kPhiRange) && ( phi < fPhiMin || phi > fPhiMax )) return kFALSE; | |
182 | if ( TestBit(kYRange) && ( y < fYMin || y > fYMax )) return kFALSE; | |
183 | ||
184 | return kTRUE; | |
185 | } | |
186 | ||
187 | ////////////////////////////////////////////////////////////////////////////////// | |
188 | ||
189 | Bool_t AliGenGeVSim::CheckAcceptance(Float_t p[3]) { | |
190 | // | |
191 | // private function used by Generate() | |
192 | // | |
193 | // Check bounds of a total momentum and theta of a track | |
194 | // | |
195 | ||
196 | if ( TestBit(kThetaRange) ) { | |
197 | ||
198 | Double_t theta = TMath::ATan2( TMath::Sqrt(p[0]*p[0]+p[1]*p[1]), p[2]); | |
199 | if ( theta < fThetaMin || theta > fThetaMax ) return kFALSE; | |
200 | } | |
201 | ||
202 | ||
203 | if ( TestBit(kMomentumRange) ) { | |
204 | ||
205 | Double_t momentum = TMath::Sqrt(p[0]*p[0] + p[1]*p[1] + p[2]*p[2]); | |
206 | if ( momentum < fPMin || momentum > fPMax) return kFALSE; | |
207 | } | |
208 | ||
209 | return kTRUE; | |
210 | } | |
211 | ||
212 | ////////////////////////////////////////////////////////////////////////////////// | |
213 | ||
214 | // Deconvoluted Pt Y formula | |
215 | ||
216 | static Double_t aPtForm(Double_t * x, Double_t * par) { | |
217 | // ptForm: pt -> x[0] , mass -> [0] , temperature -> [1] | |
218 | // Description as string: " x * exp( -sqrt([0]*[0] + x*x) / [1] )" | |
219 | ||
220 | return x[0] * TMath::Exp( -sqrt(par[0]*par[0] + x[0]*x[0]) / par[1]); | |
221 | } | |
222 | ||
223 | static Double_t aYForm(Double_t * x, Double_t * par) { | |
224 | // y Form: y -> x[0] , sigmaY -> [0] | |
225 | // Description as string: " exp ( - x*x / (2 * [0]*[0] ) )" | |
226 | ||
227 | return TMath::Exp ( - x[0]*x[0] / (2 * par[0]*par[0] ) ); | |
228 | } | |
229 | ||
230 | // Models 1-3 | |
231 | // Description as strings: | |
232 | ||
233 | // const char *kFormE = " ( sqrt([0]*[0] + x*x) * cosh(y) ) "; | |
234 | // const char *kFormG = " ( 1 / sqrt( 1 - [2]*[2] ) ) "; | |
235 | // const char *kFormYp = "( [2]*sqrt(([0]*[0]+x*x)*cosh(y)*cosh(y)-[0]*[0])/([1]*sqrt(1-[2]*[2]))) "; | |
236 | ||
237 | // const char* kFormula[3] = { | |
238 | // " x * %s * exp( -%s / [1]) ", | |
239 | // " (x * %s) / ( exp( %s / [1]) - 1 ) ", | |
240 | // " x*%s*exp(-%s*%s/[1])*((sinh(%s)/%s)+([1]/(%s*%s))*(sinh(%s)/%s-cosh(%s)))" | |
241 | // }; | |
242 | // printf(kFormula[0], kFormE, kFormE); | |
243 | // printf(kFormula[1], kFormE, kFormE); | |
244 | // printf(kFormula[2], kFormE, kFormG, kFormE, kFormYp, kFormYp, kFormG, kFormE, kFormYp, kFormYp, kFormYp); | |
245 | ||
246 | ||
247 | static Double_t aPtYFormula0(Double_t *x, Double_t * par) { | |
248 | // pt -> x , Y -> y | |
249 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
250 | ||
251 | Double_t aFormE = TMath::Sqrt(par[0]*par[0] + x[0]*x[0]) * TMath::CosH(x[1]); | |
252 | return x[0] * aFormE * TMath::Exp(-aFormE/par[1]); | |
253 | } | |
254 | ||
255 | static Double_t aPtYFormula1(Double_t *x, Double_t * par) { | |
256 | // pt -> x , Y -> y | |
257 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
258 | ||
259 | Double_t aFormE = TMath::Sqrt(par[0]*par[0] + x[0]*x[0]) * TMath::CosH(x[1]); | |
260 | return x[0] * aFormE / ( TMath::Exp( aFormE / par[1]) - 1 ); | |
261 | } | |
262 | ||
263 | static Double_t aPtYFormula2(Double_t *x, Double_t * par) { | |
264 | // pt -> x , Y -> y | |
265 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
266 | ||
267 | Double_t aFormE = TMath::Sqrt(par[0]*par[0] + x[0]*x[0]) * TMath::CosH(x[1]); | |
268 | Double_t aFormG = 1 / TMath::Sqrt( 1 - par[2]*par[2] ); | |
269 | Double_t aFormYp = par[2]*TMath::Sqrt( (par[0]*par[0] + x[0]*x[0]) | |
270 | * TMath::CosH(x[1])*TMath::CosH(x[1]) | |
271 | - par[0]*par[0] ) | |
272 | /( par[1]*TMath::Sqrt(1-par[2]*par[2])); | |
273 | ||
274 | return x[0] * aFormE * TMath::Exp( - aFormG * aFormE / par[1]) | |
275 | *( TMath::SinH(aFormYp)/aFormYp | |
276 | + par[1]/(aFormG*aFormE) | |
277 | * ( TMath::SinH(aFormYp)/aFormYp-TMath::CosH(aFormYp) ) ); | |
278 | } | |
279 | ||
280 | // Phi Flow Formula | |
281 | ||
282 | static Double_t aPhiForm(Double_t * x, Double_t * par) { | |
283 | // phi -> x | |
284 | // Psi -> [0] , Direct Flow -> [1] , Elliptical Flow -> [2] | |
285 | // Description as string: " 1 + 2*[1]*cos(x-[0]) + 2*[2]*cos(2*(x-[0])) " | |
286 | ||
287 | return 1 + 2*par[1]*TMath::Cos(x[0]-par[0]) | |
288 | + 2*par[2]*TMath::Cos(2*(x[0]-par[0])); | |
289 | } | |
290 | ||
291 | void AliGenGeVSim::InitFormula() { | |
292 | // | |
293 | // private function | |
294 | // | |
295 | // Initalizes formulas used in GeVSim. | |
296 | ||
297 | // Deconvoluted Pt Y formula | |
298 | ||
299 | fPtFormula = new TF1("gevsimPt", &aPtForm, 0, 3, 2); | |
300 | fYFormula = new TF1("gevsimRapidity", &aYForm, -3, 3,1); | |
301 | ||
302 | fPtFormula->SetParNames("mass", "temperature"); | |
303 | fPtFormula->SetParameters(1., 1.); | |
304 | ||
305 | fYFormula->SetParName(0, "sigmaY"); | |
306 | fYFormula->SetParameter(0, 1.); | |
307 | ||
308 | // Grid for Pt and Y | |
309 | fPtFormula->SetNpx(100); | |
310 | fYFormula->SetNpx(100); | |
311 | ||
312 | ||
313 | // Models 1-3 | |
314 | ||
315 | fPtYFormula[0] = new TF2("gevsimPtY_2", &aPtYFormula0, 0, 3, -2, 2, 2); | |
316 | ||
317 | fPtYFormula[1] = new TF2("gevsimPtY_3", &aPtYFormula1, 0, 3, -2, 2, 2); | |
318 | ||
319 | fPtYFormula[2] = new TF2("gevsimPtY_4", &aPtYFormula2, 0, 3, -2, 2, 3); | |
320 | ||
321 | fPtYFormula[3] = 0; | |
322 | ||
323 | ||
324 | // setting names & initialisation | |
325 | ||
326 | const char* kParamNames[3] = {"mass", "temperature", "expVel"}; | |
327 | ||
328 | Int_t i, j; | |
329 | for (i=0; i<3; i++) { | |
330 | ||
331 | fPtYFormula[i]->SetNpx(100); // step 30 MeV | |
332 | fPtYFormula[i]->SetNpy(100); // | |
333 | ||
334 | for (j=0; j<3; j++) { | |
335 | ||
336 | if ( i != 2 && j == 2 ) continue; // ExpVel | |
337 | fPtYFormula[i]->SetParName(j, kParamNames[j]); | |
338 | fPtYFormula[i]->SetParameter(j, 0.5); | |
339 | } | |
340 | } | |
341 | ||
342 | // Phi Flow Formula | |
343 | ||
344 | fPhiFormula = new TF1("gevsimPhi", &aPhiForm, 0, 2*TMath::Pi(), 3); | |
345 | ||
346 | fPhiFormula->SetParNames("psi", "directed", "elliptic"); | |
347 | fPhiFormula->SetParameters(0., 0., 0.); | |
348 | ||
349 | fPhiFormula->SetNpx(180); | |
350 | ||
351 | } | |
352 | ||
353 | ////////////////////////////////////////////////////////////////////////////////// | |
354 | ||
355 | void AliGenGeVSim::AddParticleType(AliGeVSimParticle *part) { | |
356 | // | |
357 | // Adds new type of particles. | |
358 | // | |
359 | // Parameters are defeined in AliGeVSimParticle object | |
360 | // This method has to be called for every particle type | |
361 | // | |
362 | ||
363 | if (fPartTypes == NULL) | |
364 | fPartTypes = new TObjArray(); | |
365 | ||
366 | fPartTypes->Add(part); | |
367 | } | |
368 | ||
369 | ////////////////////////////////////////////////////////////////////////////////// | |
370 | ||
371 | void AliGenGeVSim::SetMultTotal(Bool_t isTotal) { | |
372 | // | |
373 | // | |
374 | // | |
375 | ||
376 | fIsMultTotal = isTotal; | |
377 | } | |
378 | ||
379 | ////////////////////////////////////////////////////////////////////////////////// | |
380 | ||
381 | Float_t AliGenGeVSim::FindScaler(Int_t paramId, Int_t pdg) { | |
382 | // | |
383 | // private function | |
384 | // Finds Scallar for a given parameter. | |
385 | // Function used in event-by-event mode. | |
386 | // | |
387 | // There are two types of scallars: deterministic and random | |
388 | // and they can work on either global or particle type level. | |
389 | // For every variable there are four scallars defined. | |
390 | // | |
391 | // Scallars are named as folowa | |
392 | // deterministic global level : "gevsimParam" (eg. "gevsimTemp") | |
393 | // deterinistig type level : "gevsimPdgParam" (eg. "gevsim211Mult") | |
394 | // random global level : "gevsimParamRndm" (eg. "gevsimMultRndm") | |
395 | // random type level : "gevsimPdgParamRndm" (eg. "gevsim-211V2Rndm"); | |
396 | // | |
397 | // Pdg - code of a particle type in PDG standard (see: http://pdg.lbl.gov) | |
398 | // Param - parameter name. Allowed parameters: | |
399 | // | |
400 | // "Temp" - inverse slope parameter | |
401 | // "SigmaY" - rapidity width - for model (1) only | |
402 | // "ExpVel" - expansion velocity - for model (4) only | |
403 | // "V1" - directed flow | |
404 | // "V2" - elliptic flow | |
405 | // "Mult" - multiplicity | |
406 | // | |
407 | ||
408 | ||
409 | static const char* params[] = {"Temp", "SigmaY", "ExpVel", "V1", "V2", "Mult"}; | |
410 | static const char* ending[] = {"", "Rndm"}; | |
411 | ||
412 | static const char* patt1 = "gevsim%s%s"; | |
413 | static const char* patt2 = "gevsim%d%s%s"; | |
414 | ||
415 | char buffer[80]; | |
416 | TF1 *form; | |
417 | ||
418 | Float_t scaler = 1.; | |
419 | ||
420 | // Scaler evoluation: i - global/local, j - determ/random | |
421 | ||
422 | Int_t i, j; | |
423 | ||
424 | for (i=0; i<2; i++) { | |
425 | for (j=0; j<2; j++) { | |
426 | ||
427 | form = 0; | |
428 | ||
429 | if (i == 0) sprintf(buffer, patt1, params[paramId], ending[j]); | |
430 | else sprintf(buffer, patt2, pdg, params[paramId], ending[j]); | |
431 | ||
432 | form = (TF1 *)gROOT->GetFunction(buffer); | |
433 | ||
434 | if (form != 0) { | |
435 | if (j == 0) scaler *= form->Eval(gAlice->GetEvNumber()); | |
436 | if (j == 1) { | |
437 | form->SetParameter(0, gAlice->GetEvNumber()); | |
438 | scaler *= form->GetRandom(); | |
439 | } | |
440 | } | |
441 | } | |
442 | } | |
443 | ||
444 | return scaler; | |
445 | } | |
446 | ||
447 | ////////////////////////////////////////////////////////////////////////////////// | |
448 | ||
449 | void AliGenGeVSim::DetermineReactionPlane() { | |
450 | // | |
451 | // private function used by Generate() | |
452 | // | |
453 | // Retermines Reaction Plane angle and set this value | |
454 | // as a parameter [0] in fPhiFormula | |
455 | // | |
456 | // Note: if "gevsimPsiRndm" function is found it override both | |
457 | // "gevsimPhi" function and initial fPsi value | |
458 | // | |
459 | ||
460 | TF1 *form; | |
461 | ||
462 | form = 0; | |
463 | form = (TF1 *)gROOT->GetFunction("gevsimPsi"); | |
464 | if (form) fPsi = form->Eval(gAlice->GetEvNumber()) * TMath::Pi() / 180; | |
465 | ||
466 | form = 0; | |
467 | form = (TF1 *)gROOT->GetFunction("gevsimPsiRndm"); | |
468 | if (form) fPsi = form->GetRandom() * TMath::Pi() / 180; | |
469 | ||
470 | ||
471 | cout << "Psi = " << fPsi << "\t" << (Int_t)(fPsi*180./TMath::Pi()) << endl; | |
472 | ||
473 | fPhiFormula->SetParameter(0, fPsi); | |
474 | } | |
475 | ||
476 | ////////////////////////////////////////////////////////////////////////////////// | |
477 | ||
478 | Float_t AliGenGeVSim::GetdNdYToTotal() { | |
479 | // | |
480 | // Private, helper function used by Generate() | |
481 | // | |
482 | // Returns total multiplicity to dN/dY ration using current distribution. | |
483 | // The function have to be called after setting distribution and its | |
484 | // parameters (like temperature). | |
485 | // | |
486 | ||
487 | Float_t integ, mag; | |
488 | const Double_t kMaxPt = 3.0, kMaxY = 2.; | |
489 | ||
490 | if (fModel == 1) { | |
491 | ||
492 | integ = fYFormula->Integral(-kMaxY, kMaxY); | |
493 | mag = fYFormula->Eval(0); | |
494 | return integ/mag; | |
495 | } | |
496 | ||
497 | // 2D formula standard or custom | |
498 | ||
499 | if (fModel > 1 && fModel < 6) { | |
500 | ||
501 | integ = ((TF2*)fCurrentForm)->Integral(0,kMaxPt, -kMaxY, kMaxY); | |
502 | mag = ((TF2*)fCurrentForm)->Integral(0, kMaxPt, -0.1, 0.1) / 0.2; | |
503 | return integ/mag; | |
504 | } | |
505 | ||
506 | // 2 1D histograms | |
507 | ||
508 | if (fModel == 6) { | |
509 | ||
510 | integ = fHist[1]->Integral(); | |
511 | mag = fHist[0]->GetBinContent(fHist[0]->FindBin(0.)); | |
512 | mag /= fHist[0]->GetBinWidth(fHist[0]->FindBin(0.)); | |
513 | return integ/mag; | |
514 | } | |
515 | ||
516 | // 2D histogram | |
517 | ||
518 | if (fModel == 7) { | |
519 | ||
520 | // Not tested ... | |
521 | Int_t yBins = fPtYHist->GetNbinsY(); | |
522 | Int_t ptBins = fPtYHist->GetNbinsX(); | |
523 | ||
524 | integ = fPtYHist->Integral(0, ptBins, 0, yBins); | |
525 | mag = fPtYHist->Integral(0, ptBins, (yBins/2)-1, (yBins/2)+1 ) / 2; | |
526 | return integ/mag; | |
527 | } | |
528 | ||
529 | return 1; | |
530 | } | |
531 | ||
532 | ////////////////////////////////////////////////////////////////////////////////// | |
533 | ||
534 | void AliGenGeVSim::SetFormula(Int_t pdg) { | |
535 | // | |
536 | // Private function used by Generate() | |
537 | // | |
538 | // Configure a formula for a given particle type and model Id (in fModel). | |
539 | // If custom formula or histogram was selected the function tries | |
540 | // to find it. | |
541 | // | |
542 | // The function implements naming conventions for custom distributions names | |
543 | // | |
544 | ||
545 | char buff[40]; | |
546 | const char* msg[4] = { | |
547 | "Custom Formula for Pt Y distribution not found [pdg = %d]", | |
548 | "Histogram for Pt distribution not found [pdg = %d]", | |
549 | "Histogram for Y distribution not found [pdg = %d]", | |
550 | "HIstogram for Pt Y dostribution not found [pdg = %d]" | |
551 | }; | |
552 | ||
553 | const char* pattern[8] = { | |
554 | "gevsimDistPtY", "gevsimDist%dPtY", | |
555 | "gevsimHistPt", "gevsimHist%dPt", | |
556 | "gevsimHistY", "gevsimHist%dY", | |
557 | "gevsimHistPtY", "gevsimHist%dPtY" | |
558 | }; | |
559 | ||
560 | const char *where = "SetFormula"; | |
561 | ||
562 | ||
563 | if (fModel < 1 || fModel > 7) | |
564 | Error("SetFormula", "Model Id (%d) out of range [1-7]", fModel); | |
565 | ||
566 | ||
567 | // standard models | |
568 | ||
569 | if (fModel == 1) fCurrentForm = fPtFormula; | |
570 | if (fModel > 1 && fModel < 5) fCurrentForm = fPtYFormula[fModel-2]; | |
571 | ||
572 | ||
573 | // custom model defined by a formula | |
574 | ||
575 | if (fModel == 5) { | |
576 | ||
577 | fCurrentForm = 0; | |
578 | fCurrentForm = (TF2*)gROOT->GetFunction(pattern[0]); | |
579 | ||
580 | if (!fCurrentForm) { | |
581 | ||
582 | sprintf(buff, pattern[1], pdg); | |
583 | fCurrentForm = (TF2*)gROOT->GetFunction(buff); | |
584 | ||
585 | if (!fCurrentForm) Error(where, msg[0], pdg); | |
586 | } | |
587 | } | |
588 | ||
589 | // 2 1D histograms | |
590 | ||
591 | if (fModel == 6) { | |
592 | ||
593 | for (Int_t i=0; i<2; i++) { | |
594 | ||
595 | fHist[i] = 0; | |
596 | fHist[i] = (TH1D*)gROOT->FindObject(pattern[2+2*i]); | |
597 | ||
598 | if (!fHist[i]) { | |
599 | ||
600 | sprintf(buff, pattern[3+2*i], pdg); | |
601 | fHist[i] = (TH1D*)gROOT->FindObject(buff); | |
602 | ||
603 | if (!fHist[i]) Error(where, msg[1+i], pdg); | |
604 | } | |
605 | } | |
606 | } | |
607 | ||
608 | // 2d histogram | |
609 | ||
610 | if (fModel == 7) { | |
611 | ||
612 | fPtYHist = 0; | |
613 | fPtYHist = (TH2D*)gROOT->FindObject(pattern[6]); | |
614 | ||
615 | if (!fPtYHist) { | |
616 | ||
617 | sprintf(buff, pattern[7], pdg); | |
618 | fPtYHist = (TH2D*)gROOT->FindObject(buff); | |
619 | } | |
620 | ||
621 | if (!fPtYHist) Error(where, msg[3], pdg); | |
622 | } | |
623 | ||
624 | } | |
625 | ||
626 | ////////////////////////////////////////////////////////////////////////////////// | |
627 | ||
628 | void AliGenGeVSim:: AdjustFormula() { | |
629 | // | |
630 | // Private Function | |
631 | // Adjust fomula bounds according to acceptance cuts. | |
632 | // | |
633 | // Since GeVSim is producing "thermal" particles Pt | |
634 | // is cut at 3 GeV even when acceptance extends to grater momenta. | |
635 | // | |
636 | // WARNING ! | |
637 | // If custom formula was provided function preserves | |
638 | // original cuts. | |
639 | // | |
640 | ||
641 | const Double_t kMaxPt = 3.0; | |
642 | const Double_t kMaxY = 2.0; | |
643 | Double_t minPt, maxPt, minY, maxY; | |
644 | ||
645 | ||
646 | if (fModel > 4) return; | |
647 | ||
648 | // max Pt | |
649 | if (TestBit(kPtRange) && fPtMax < kMaxPt ) maxPt = fPtMax; | |
650 | else maxPt = kMaxPt; | |
651 | ||
652 | // min Pt | |
653 | if (TestBit(kPtRange)) minPt = fPtMin; | |
654 | else minPt = 0; | |
655 | ||
656 | if (TestBit(kPtRange) && fPtMin > kMaxPt ) | |
657 | Warning("Acceptance", "Minimum Pt (%3.2f GeV) greater that 3.0 GeV ", fPtMin); | |
658 | ||
659 | // Max Pt < Max P | |
660 | if (TestBit(kMomentumRange) && fPtMax < maxPt) maxPt = fPtMax; | |
661 | ||
662 | // max and min rapidity | |
663 | if (TestBit(kYRange)) { | |
664 | minY = fYMin; | |
665 | maxY = fYMax; | |
666 | } else { | |
667 | minY = -kMaxY; | |
668 | maxY = kMaxY; | |
669 | } | |
670 | ||
671 | // adjust formula | |
672 | ||
673 | if (fModel == 1) { | |
674 | fPtFormula->SetRange(fPtMin, maxPt); | |
675 | fYFormula->SetRange(fYMin, fYMax); | |
676 | } | |
677 | ||
678 | if (fModel > 1) | |
679 | ((TF2*)fCurrentForm)->SetRange(minPt, minY, maxPt, maxY); | |
680 | ||
681 | // azimuthal cut | |
682 | ||
683 | if (TestBit(kPhiRange)) | |
684 | fPhiFormula->SetRange(fPhiMin, fPhiMax); | |
685 | ||
686 | } | |
687 | ||
688 | ////////////////////////////////////////////////////////////////////////////////// | |
689 | ||
690 | void AliGenGeVSim::GetRandomPtY(Double_t &pt, Double_t &y) { | |
691 | // | |
692 | // Private function used by Generate() | |
693 | // | |
694 | // Returns random values of Pt and Y corresponding to selected | |
695 | // distribution. | |
696 | // | |
697 | ||
698 | if (fModel == 1) { | |
699 | pt = fPtFormula->GetRandom(); | |
700 | y = fYFormula->GetRandom(); | |
701 | return; | |
702 | } | |
703 | ||
704 | if (fModel > 1 && fModel < 6) { | |
705 | ((TF2*)fCurrentForm)->GetRandom2(pt, y); | |
706 | return; | |
707 | } | |
708 | ||
709 | if (fModel == 6) { | |
710 | pt = fHist[0]->GetRandom(); | |
711 | y = fHist[1]->GetRandom(); | |
712 | } | |
713 | ||
714 | if (fModel == 7) { | |
715 | fPtYHist->GetRandom2(pt, y); | |
716 | return; | |
717 | } | |
718 | } | |
719 | ||
720 | ////////////////////////////////////////////////////////////////////////////////// | |
721 | ||
722 | void AliGenGeVSim::Init() { | |
723 | // | |
724 | // Standard AliGenerator initializer. | |
725 | // does nothing | |
726 | // | |
727 | } | |
728 | ||
729 | ////////////////////////////////////////////////////////////////////////////////// | |
730 | ||
731 | void AliGenGeVSim::Generate() { | |
732 | // | |
733 | // Standard AliGenerator function | |
734 | // This function do actual job and puts particles on stack. | |
735 | // | |
736 | ||
737 | PDG_t pdg; // particle type | |
738 | Float_t mass; // particle mass | |
739 | Float_t orgin[3] = {0,0,0}; // particle orgin [cm] | |
740 | Float_t polar[3] = {0,0,0}; // polarisation | |
741 | Float_t time = 0; // time of creation | |
742 | ||
743 | Float_t multiplicity = 0; | |
744 | Bool_t isMultTotal = kTRUE; | |
745 | ||
746 | Float_t paramScaler; | |
747 | Float_t directedScaller = 1., ellipticScaller = 1.; | |
748 | ||
749 | TLorentzVector *v = new TLorentzVector(0,0,0,0); | |
750 | ||
751 | const Int_t kParent = -1; | |
752 | Int_t id; | |
753 | ||
754 | // vertexing | |
755 | VertexInternal(); | |
756 | orgin[0] = fVertex[0]; | |
757 | orgin[1] = fVertex[1]; | |
758 | orgin[2] = fVertex[2]; | |
759 | ||
760 | ||
761 | // Particle params database | |
762 | ||
763 | TDatabasePDG *db = TDatabasePDG::Instance(); | |
764 | TParticlePDG *type; | |
765 | AliGeVSimParticle *partType; | |
766 | ||
767 | Int_t nType, nParticle, nParam; | |
768 | const Int_t kNParams = 6; | |
769 | ||
770 | // reaction plane determination and model | |
771 | DetermineReactionPlane(); | |
772 | ||
773 | // loop over particle types | |
774 | ||
775 | for (nType = 0; nType < fPartTypes->GetEntries(); nType++) { | |
776 | ||
777 | partType = (AliGeVSimParticle *)fPartTypes->At(nType); | |
778 | ||
779 | pdg = (PDG_t)partType->GetPdgCode(); | |
780 | type = db->GetParticle(pdg); | |
781 | mass = type->Mass(); | |
782 | ||
783 | fModel = partType->GetModel(); | |
784 | SetFormula(pdg); | |
785 | fCurrentForm->SetParameter("mass", mass); | |
786 | ||
787 | ||
788 | // Evaluation of parameters - loop over parameters | |
789 | ||
790 | for (nParam = 0; nParam < kNParams; nParam++) { | |
791 | ||
792 | paramScaler = FindScaler(nParam, pdg); | |
793 | ||
794 | if (nParam == 0) | |
795 | fCurrentForm->SetParameter("temperature", paramScaler * partType->GetTemperature()); | |
796 | ||
797 | if (nParam == 1 && fModel == 1) | |
798 | fYFormula->SetParameter("sigmaY", paramScaler * partType->GetSigmaY()); | |
799 | ||
800 | if (nParam == 2 && fModel == 4) { | |
801 | ||
802 | Double_t totalExpVal = paramScaler * partType->GetExpansionVelocity(); | |
803 | ||
804 | if (totalExpVal == 0.0) totalExpVal = 0.0001; | |
805 | if (totalExpVal == 1.0) totalExpVal = 9.9999; | |
806 | ||
807 | fCurrentForm->SetParameter("expVel", totalExpVal); | |
808 | } | |
809 | ||
810 | // flow | |
811 | ||
812 | if (nParam == 3) directedScaller = paramScaler; | |
813 | if (nParam == 4) ellipticScaller = paramScaler; | |
814 | ||
815 | // multiplicity | |
816 | ||
817 | if (nParam == 5) { | |
818 | ||
819 | if (partType->IsMultForced()) isMultTotal = partType->IsMultTotal(); | |
820 | else isMultTotal = fIsMultTotal; | |
821 | ||
822 | multiplicity = paramScaler * partType->GetMultiplicity(); | |
823 | multiplicity *= (isMultTotal)? 1 : GetdNdYToTotal(); | |
824 | } | |
825 | } | |
826 | ||
827 | // Flow defined on the particle type level (not parameterised) | |
828 | if (partType->IsFlowSimple()) { | |
829 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(0,0) * directedScaller); | |
830 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(0,0) * ellipticScaller); | |
831 | } | |
832 | ||
833 | AdjustFormula(); | |
834 | ||
835 | ||
836 | Info("Generate","PDG = %d \t Mult = %d", pdg, (Int_t)multiplicity); | |
837 | ||
838 | // loop over particles | |
839 | ||
840 | nParticle = 0; | |
841 | while (nParticle < multiplicity) { | |
842 | ||
843 | Double_t pt, y, phi; // momentum in [pt,y,phi] | |
844 | Float_t p[3] = {0,0,0}; // particle momentum | |
845 | ||
846 | GetRandomPtY(pt, y); | |
847 | ||
848 | // phi distribution configuration when differential flow defined | |
849 | // to be optimised in future release | |
850 | ||
851 | if (!partType->IsFlowSimple()) { | |
852 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(pt,y) * directedScaller); | |
853 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(pt,y) * ellipticScaller); | |
854 | } | |
855 | ||
856 | phi = fPhiFormula->GetRandom(); | |
857 | ||
858 | if (!isMultTotal) nParticle++; | |
859 | if (fModel > 4 && !CheckPtYPhi(pt,y,phi) ) continue; | |
860 | ||
861 | // coordinate transformation | |
862 | v->SetPtEtaPhiM(pt, y, phi, mass); | |
863 | ||
864 | p[0] = v->Px(); | |
865 | p[1] = v->Py(); | |
866 | p[2] = v->Pz(); | |
867 | ||
868 | // momentum range test | |
869 | if ( !CheckAcceptance(p) ) continue; | |
870 | ||
871 | // putting particle on the stack | |
872 | ||
873 | PushTrack(fTrackIt, kParent, pdg, p, orgin, polar, time, kPPrimary, id, fTrackIt); | |
874 | if (isMultTotal) nParticle++; | |
875 | } | |
876 | } | |
877 | ||
878 | // prepare and store header | |
879 | ||
880 | AliGenGeVSimEventHeader *header = new AliGenGeVSimEventHeader("GeVSim header"); | |
881 | TArrayF eventVertex(3,orgin); | |
882 | ||
883 | header->SetPrimaryVertex(eventVertex); | |
884 | header->SetEventPlane(fPsi); | |
885 | header->SetEllipticFlow(fPhiFormula->GetParameter(2)); | |
886 | ||
887 | gAlice->SetGenEventHeader(header); | |
888 | ||
889 | delete v; | |
890 | } | |
891 | ||
892 | ////////////////////////////////////////////////////////////////////////////////// |