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0af12c00 | 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 | /* $Id$ */ | |
ac3faee4 | 17 | |
4966b266 | 18 | // |
7e4131fc | 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 | |
4966b266 | 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 | // | |
7e4131fc | 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. | |
4966b266 | 35 | // |
36 | // Azimuthal distribution is deconvoluted from (Pt,Y) distribution | |
37 | // and is described by two Fourier coefficients representing | |
7e4131fc | 38 | // Directed and Elliptic flow. |
4966b266 | 39 | // |
7e4131fc | 40 | //////////////////////////////////////////////////////////////////////////////// |
41 | // | |
4966b266 | 42 | // To apply flow to event ganerated by an arbitraly event generator |
43 | // refer to AliGenAfterBurnerFlow class. | |
44 | // | |
7e4131fc | 45 | //////////////////////////////////////////////////////////////////////////////// |
46 | // | |
4966b266 | 47 | // For examples, parameters and testing macros refer to: |
48 | // http:/home.cern.ch/radomski | |
7e4131fc | 49 | // |
50 | // for more detailed description refer to ALICE NOTE | |
51 | // "GeVSim Monte-Carlo Event Generator" | |
52 | // S.Radosmki, P. Foka. | |
4966b266 | 53 | // |
54 | // Author: | |
55 | // Sylwester Radomski, | |
56 | // GSI, March 2002 | |
57 | // | |
58 | // S.Radomski@gsi.de | |
59 | // | |
60 | //////////////////////////////////////////////////////////////////////////////// | |
7e4131fc | 61 | // |
62 | // Updated and revised: September 2002, S. Radomski, GSI | |
63 | // | |
64 | //////////////////////////////////////////////////////////////////////////////// | |
65 | ||
7816887f | 66 | |
116cbefd | 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> | |
7816887f | 77 | |
4966b266 | 78 | |
4966b266 | 79 | #include "AliGeVSimParticle.h" |
116cbefd | 80 | #include "AliGenGeVSim.h" |
daa61231 | 81 | #include "AliGenGeVSimEventHeader.h" |
116cbefd | 82 | #include "AliGenerator.h" |
83 | #include "AliRun.h" | |
4966b266 | 84 | |
7816887f | 85 | |
925e6570 | 86 | ClassImp(AliGenGeVSim) |
7816887f | 87 | |
88 | ////////////////////////////////////////////////////////////////////////////////// | |
89 | ||
7ababb0c | 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), | |
1c56e311 | 100 | fPartTypes(0) |
101 | { | |
4966b266 | 102 | // |
103 | // Default constructor | |
104 | // | |
7816887f | 105 | |
7e4131fc | 106 | for (Int_t i=0; i<4; i++) |
7816887f | 107 | fPtYFormula[i] = 0; |
7ababb0c | 108 | for (Int_t i=0; i<2; i++) |
109 | fHist[i] = 0; | |
7816887f | 110 | } |
111 | ||
112 | ////////////////////////////////////////////////////////////////////////////////// | |
113 | ||
1c56e311 | 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 | { | |
4966b266 | 126 | // |
127 | // Standard Constructor. | |
128 | // | |
7e4131fc | 129 | // models - thermal model to be used: |
4966b266 | 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" | |
7e4131fc | 134 | // 6 - custom model defined by two 1D histograms |
135 | // 7 - custom model defined by 2D histogram | |
4966b266 | 136 | // |
7e4131fc | 137 | // psi - reaction plane in degrees |
138 | // isMultTotal - multiplicity mode | |
139 | // kTRUE - total multiplicity (default) | |
140 | // kFALSE - dN/dY at midrapidity | |
141 | // | |
7816887f | 142 | |
143 | // checking consistancy | |
7e4131fc | 144 | |
4966b266 | 145 | if (psi < 0 || psi > 360 ) |
146 | Error ("AliGenGeVSim", "Reaction plane angle ( %d )out of range [0..360]", psi); | |
7816887f | 147 | |
daa61231 | 148 | fPsi = psi * TMath::Pi() / 180. ; |
7e4131fc | 149 | fIsMultTotal = isMultTotal; |
7816887f | 150 | |
1c56e311 | 151 | // Initialization |
7816887f | 152 | |
153 | fPartTypes = new TObjArray(); | |
154 | InitFormula(); | |
7816887f | 155 | } |
156 | ||
157 | ////////////////////////////////////////////////////////////////////////////////// | |
158 | ||
159 | AliGenGeVSim::~AliGenGeVSim() { | |
4966b266 | 160 | // |
161 | // Default Destructor | |
162 | // | |
163 | // Removes TObjArray keeping list of registered particle types | |
164 | // | |
7816887f | 165 | |
166 | if (fPartTypes != NULL) delete fPartTypes; | |
167 | } | |
168 | ||
169 | ||
170 | ////////////////////////////////////////////////////////////////////////////////// | |
171 | ||
0af12c00 | 172 | Bool_t AliGenGeVSim::CheckPtYPhi(Float_t pt, Float_t y, Float_t phi) const { |
4966b266 | 173 | // |
174 | // private function used by Generate() | |
175 | // | |
176 | // Check bounds of Pt, Rapidity and Azimuthal Angle of a track | |
7e4131fc | 177 | // Used only when generating particles from a histogram |
4966b266 | 178 | // |
7816887f | 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 | ||
7816887f | 184 | return kTRUE; |
185 | } | |
186 | ||
187 | ////////////////////////////////////////////////////////////////////////////////// | |
188 | ||
7e4131fc | 189 | Bool_t AliGenGeVSim::CheckAcceptance(Float_t p[3]) { |
4966b266 | 190 | // |
191 | // private function used by Generate() | |
192 | // | |
7e4131fc | 193 | // Check bounds of a total momentum and theta of a track |
4966b266 | 194 | // |
7816887f | 195 | |
7e4131fc | 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 | ||
7816887f | 202 | |
7e4131fc | 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 | } | |
7816887f | 208 | |
209 | return kTRUE; | |
210 | } | |
211 | ||
212 | ////////////////////////////////////////////////////////////////////////////////// | |
213 | ||
7ababb0c | 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]); | |
60e55aee | 268 | Double_t aFormG = 1 / TMath::Sqrt((1.-par[2])*(1.+par[2])); |
7ababb0c | 269 | Double_t aFormYp = par[2]*TMath::Sqrt( (par[0]*par[0] + x[0]*x[0]) |
60e55aee | 270 | * (TMath::CosH(x[1])-par[0])*(TMath::CosH(x[1])+par[0])) |
271 | /( par[1]*TMath::Sqrt((1.-par[2])*(1.+par[2]))); | |
7ababb0c | 272 | |
273 | return x[0] * aFormE * TMath::Exp( - aFormG * aFormE / par[1]) | |
274 | *( TMath::SinH(aFormYp)/aFormYp | |
275 | + par[1]/(aFormG*aFormE) | |
276 | * ( TMath::SinH(aFormYp)/aFormYp-TMath::CosH(aFormYp) ) ); | |
277 | } | |
278 | ||
279 | // Phi Flow Formula | |
280 | ||
281 | static Double_t aPhiForm(Double_t * x, Double_t * par) { | |
282 | // phi -> x | |
283 | // Psi -> [0] , Direct Flow -> [1] , Elliptical Flow -> [2] | |
284 | // Description as string: " 1 + 2*[1]*cos(x-[0]) + 2*[2]*cos(2*(x-[0])) " | |
285 | ||
286 | return 1 + 2*par[1]*TMath::Cos(x[0]-par[0]) | |
287 | + 2*par[2]*TMath::Cos(2*(x[0]-par[0])); | |
288 | } | |
289 | ||
7816887f | 290 | void AliGenGeVSim::InitFormula() { |
4966b266 | 291 | // |
292 | // private function | |
293 | // | |
294 | // Initalizes formulas used in GeVSim. | |
7816887f | 295 | |
296 | // Deconvoluted Pt Y formula | |
297 | ||
7ababb0c | 298 | fPtFormula = new TF1("gevsimPt", &aPtForm, 0, 3, 2); |
299 | fYFormula = new TF1("gevsimRapidity", &aYForm, -3, 3,1); | |
7816887f | 300 | |
7e4131fc | 301 | fPtFormula->SetParNames("mass", "temperature"); |
7816887f | 302 | fPtFormula->SetParameters(1., 1.); |
303 | ||
7e4131fc | 304 | fYFormula->SetParName(0, "sigmaY"); |
7816887f | 305 | fYFormula->SetParameter(0, 1.); |
306 | ||
307 | // Grid for Pt and Y | |
308 | fPtFormula->SetNpx(100); | |
309 | fYFormula->SetNpx(100); | |
310 | ||
311 | ||
312 | // Models 1-3 | |
313 | ||
7ababb0c | 314 | fPtYFormula[0] = new TF2("gevsimPtY_2", &aPtYFormula0, 0, 3, -2, 2, 2); |
7816887f | 315 | |
7ababb0c | 316 | fPtYFormula[1] = new TF2("gevsimPtY_3", &aPtYFormula1, 0, 3, -2, 2, 2); |
7816887f | 317 | |
7ababb0c | 318 | fPtYFormula[2] = new TF2("gevsimPtY_4", &aPtYFormula2, 0, 3, -2, 2, 3); |
7816887f | 319 | |
320 | fPtYFormula[3] = 0; | |
321 | ||
322 | ||
323 | // setting names & initialisation | |
324 | ||
7ababb0c | 325 | const char* kParamNames[3] = {"mass", "temperature", "expVel"}; |
326 | ||
7816887f | 327 | Int_t i, j; |
328 | for (i=0; i<3; i++) { | |
329 | ||
7e4131fc | 330 | fPtYFormula[i]->SetNpx(100); // step 30 MeV |
331 | fPtYFormula[i]->SetNpy(100); // | |
7816887f | 332 | |
333 | for (j=0; j<3; j++) { | |
334 | ||
335 | if ( i != 2 && j == 2 ) continue; // ExpVel | |
49039a84 | 336 | fPtYFormula[i]->SetParName(j, kParamNames[j]); |
7816887f | 337 | fPtYFormula[i]->SetParameter(j, 0.5); |
338 | } | |
339 | } | |
340 | ||
341 | // Phi Flow Formula | |
342 | ||
7ababb0c | 343 | fPhiFormula = new TF1("gevsimPhi", &aPhiForm, 0, 2*TMath::Pi(), 3); |
7816887f | 344 | |
7e4131fc | 345 | fPhiFormula->SetParNames("psi", "directed", "elliptic"); |
346 | fPhiFormula->SetParameters(0., 0., 0.); | |
7816887f | 347 | |
7e4131fc | 348 | fPhiFormula->SetNpx(180); |
7816887f | 349 | |
350 | } | |
351 | ||
352 | ////////////////////////////////////////////////////////////////////////////////// | |
353 | ||
354 | void AliGenGeVSim::AddParticleType(AliGeVSimParticle *part) { | |
4966b266 | 355 | // |
356 | // Adds new type of particles. | |
357 | // | |
358 | // Parameters are defeined in AliGeVSimParticle object | |
359 | // This method has to be called for every particle type | |
360 | // | |
7816887f | 361 | |
362 | if (fPartTypes == NULL) | |
363 | fPartTypes = new TObjArray(); | |
364 | ||
365 | fPartTypes->Add(part); | |
7e4131fc | 366 | } |
367 | ||
368 | ////////////////////////////////////////////////////////////////////////////////// | |
7816887f | 369 | |
7e4131fc | 370 | void AliGenGeVSim::SetMultTotal(Bool_t isTotal) { |
371 | // | |
372 | // | |
373 | // | |
374 | ||
375 | fIsMultTotal = isTotal; | |
7816887f | 376 | } |
377 | ||
378 | ////////////////////////////////////////////////////////////////////////////////// | |
379 | ||
380 | Float_t AliGenGeVSim::FindScaler(Int_t paramId, Int_t pdg) { | |
4966b266 | 381 | // |
382 | // private function | |
383 | // Finds Scallar for a given parameter. | |
384 | // Function used in event-by-event mode. | |
385 | // | |
386 | // There are two types of scallars: deterministic and random | |
387 | // and they can work on either global or particle type level. | |
388 | // For every variable there are four scallars defined. | |
389 | // | |
390 | // Scallars are named as folowa | |
391 | // deterministic global level : "gevsimParam" (eg. "gevsimTemp") | |
392 | // deterinistig type level : "gevsimPdgParam" (eg. "gevsim211Mult") | |
393 | // random global level : "gevsimParamRndm" (eg. "gevsimMultRndm") | |
394 | // random type level : "gevsimPdgParamRndm" (eg. "gevsim-211V2Rndm"); | |
395 | // | |
396 | // Pdg - code of a particle type in PDG standard (see: http://pdg.lbl.gov) | |
397 | // Param - parameter name. Allowed parameters: | |
398 | // | |
399 | // "Temp" - inverse slope parameter | |
400 | // "SigmaY" - rapidity width - for model (1) only | |
401 | // "ExpVel" - expansion velocity - for model (4) only | |
402 | // "V1" - directed flow | |
403 | // "V2" - elliptic flow | |
404 | // "Mult" - multiplicity | |
405 | // | |
406 | ||
407 | ||
7816887f | 408 | static const char* params[] = {"Temp", "SigmaY", "ExpVel", "V1", "V2", "Mult"}; |
409 | static const char* ending[] = {"", "Rndm"}; | |
410 | ||
411 | static const char* patt1 = "gevsim%s%s"; | |
412 | static const char* patt2 = "gevsim%d%s%s"; | |
413 | ||
414 | char buffer[80]; | |
415 | TF1 *form; | |
416 | ||
417 | Float_t scaler = 1.; | |
418 | ||
419 | // Scaler evoluation: i - global/local, j - determ/random | |
420 | ||
421 | Int_t i, j; | |
422 | ||
423 | for (i=0; i<2; i++) { | |
424 | for (j=0; j<2; j++) { | |
425 | ||
426 | form = 0; | |
427 | ||
428 | if (i == 0) sprintf(buffer, patt1, params[paramId], ending[j]); | |
429 | else sprintf(buffer, patt2, pdg, params[paramId], ending[j]); | |
430 | ||
431 | form = (TF1 *)gROOT->GetFunction(buffer); | |
432 | ||
433 | if (form != 0) { | |
434 | if (j == 0) scaler *= form->Eval(gAlice->GetEvNumber()); | |
435 | if (j == 1) { | |
436 | form->SetParameter(0, gAlice->GetEvNumber()); | |
437 | scaler *= form->GetRandom(); | |
438 | } | |
439 | } | |
440 | } | |
441 | } | |
442 | ||
443 | return scaler; | |
444 | } | |
445 | ||
446 | ////////////////////////////////////////////////////////////////////////////////// | |
447 | ||
4966b266 | 448 | void AliGenGeVSim::DetermineReactionPlane() { |
449 | // | |
450 | // private function used by Generate() | |
451 | // | |
452 | // Retermines Reaction Plane angle and set this value | |
453 | // as a parameter [0] in fPhiFormula | |
454 | // | |
455 | // Note: if "gevsimPsiRndm" function is found it override both | |
456 | // "gevsimPhi" function and initial fPsi value | |
457 | // | |
458 | ||
459 | TF1 *form; | |
460 | ||
461 | form = 0; | |
462 | form = (TF1 *)gROOT->GetFunction("gevsimPsi"); | |
daa61231 | 463 | if (form) fPsi = form->Eval(gAlice->GetEvNumber()) * TMath::Pi() / 180; |
4966b266 | 464 | |
7e4131fc | 465 | form = 0; |
4966b266 | 466 | form = (TF1 *)gROOT->GetFunction("gevsimPsiRndm"); |
daa61231 | 467 | if (form) fPsi = form->GetRandom() * TMath::Pi() / 180; |
468 | ||
469 | ||
470 | cout << "Psi = " << fPsi << "\t" << (Int_t)(fPsi*180./TMath::Pi()) << endl; | |
4966b266 | 471 | |
472 | fPhiFormula->SetParameter(0, fPsi); | |
473 | } | |
474 | ||
475 | ////////////////////////////////////////////////////////////////////////////////// | |
476 | ||
7e4131fc | 477 | Float_t AliGenGeVSim::GetdNdYToTotal() { |
4966b266 | 478 | // |
7e4131fc | 479 | // Private, helper function used by Generate() |
4966b266 | 480 | // |
7e4131fc | 481 | // Returns total multiplicity to dN/dY ration using current distribution. |
482 | // The function have to be called after setting distribution and its | |
483 | // parameters (like temperature). | |
484 | // | |
485 | ||
486 | Float_t integ, mag; | |
49039a84 | 487 | const Double_t kMaxPt = 3.0, kMaxY = 2.; |
7e4131fc | 488 | |
489 | if (fModel == 1) { | |
490 | ||
49039a84 | 491 | integ = fYFormula->Integral(-kMaxY, kMaxY); |
7e4131fc | 492 | mag = fYFormula->Eval(0); |
493 | return integ/mag; | |
494 | } | |
495 | ||
496 | // 2D formula standard or custom | |
497 | ||
498 | if (fModel > 1 && fModel < 6) { | |
499 | ||
49039a84 | 500 | integ = ((TF2*)fCurrentForm)->Integral(0,kMaxPt, -kMaxY, kMaxY); |
501 | mag = ((TF2*)fCurrentForm)->Integral(0, kMaxPt, -0.1, 0.1) / 0.2; | |
7e4131fc | 502 | return integ/mag; |
503 | } | |
504 | ||
505 | // 2 1D histograms | |
506 | ||
507 | if (fModel == 6) { | |
508 | ||
509 | integ = fHist[1]->Integral(); | |
510 | mag = fHist[0]->GetBinContent(fHist[0]->FindBin(0.)); | |
511 | mag /= fHist[0]->GetBinWidth(fHist[0]->FindBin(0.)); | |
512 | return integ/mag; | |
513 | } | |
514 | ||
515 | // 2D histogram | |
4966b266 | 516 | |
7e4131fc | 517 | if (fModel == 7) { |
518 | ||
519 | // Not tested ... | |
520 | Int_t yBins = fPtYHist->GetNbinsY(); | |
521 | Int_t ptBins = fPtYHist->GetNbinsX(); | |
522 | ||
523 | integ = fPtYHist->Integral(0, ptBins, 0, yBins); | |
524 | mag = fPtYHist->Integral(0, ptBins, (yBins/2)-1, (yBins/2)+1 ) / 2; | |
525 | return integ/mag; | |
526 | } | |
527 | ||
528 | return 1; | |
4966b266 | 529 | } |
530 | ||
531 | ////////////////////////////////////////////////////////////////////////////////// | |
532 | ||
7e4131fc | 533 | void AliGenGeVSim::SetFormula(Int_t pdg) { |
4966b266 | 534 | // |
7e4131fc | 535 | // Private function used by Generate() |
4966b266 | 536 | // |
7e4131fc | 537 | // Configure a formula for a given particle type and model Id (in fModel). |
538 | // If custom formula or histogram was selected the function tries | |
539 | // to find it. | |
540 | // | |
541 | // The function implements naming conventions for custom distributions names | |
542 | // | |
7816887f | 543 | |
7e4131fc | 544 | char buff[40]; |
545 | const char* msg[4] = { | |
546 | "Custom Formula for Pt Y distribution not found [pdg = %d]", | |
547 | "Histogram for Pt distribution not found [pdg = %d]", | |
548 | "Histogram for Y distribution not found [pdg = %d]", | |
549 | "HIstogram for Pt Y dostribution not found [pdg = %d]" | |
550 | }; | |
551 | ||
552 | const char* pattern[8] = { | |
553 | "gevsimDistPtY", "gevsimDist%dPtY", | |
554 | "gevsimHistPt", "gevsimHist%dPt", | |
555 | "gevsimHistY", "gevsimHist%dY", | |
556 | "gevsimHistPtY", "gevsimHist%dPtY" | |
557 | }; | |
558 | ||
559 | const char *where = "SetFormula"; | |
7816887f | 560 | |
7816887f | 561 | |
7e4131fc | 562 | if (fModel < 1 || fModel > 7) |
563 | Error("SetFormula", "Model Id (%d) out of range [1-7]", fModel); | |
564 | ||
565 | ||
566 | // standard models | |
567 | ||
568 | if (fModel == 1) fCurrentForm = fPtFormula; | |
569 | if (fModel > 1 && fModel < 5) fCurrentForm = fPtYFormula[fModel-2]; | |
570 | ||
571 | ||
572 | // custom model defined by a formula | |
573 | ||
7816887f | 574 | if (fModel == 5) { |
575 | ||
7e4131fc | 576 | fCurrentForm = 0; |
577 | fCurrentForm = (TF2*)gROOT->GetFunction(pattern[0]); | |
578 | ||
579 | if (!fCurrentForm) { | |
580 | ||
581 | sprintf(buff, pattern[1], pdg); | |
582 | fCurrentForm = (TF2*)gROOT->GetFunction(buff); | |
583 | ||
584 | if (!fCurrentForm) Error(where, msg[0], pdg); | |
585 | } | |
586 | } | |
587 | ||
588 | // 2 1D histograms | |
589 | ||
590 | if (fModel == 6) { | |
7816887f | 591 | |
7e4131fc | 592 | for (Int_t i=0; i<2; i++) { |
7816887f | 593 | |
7e4131fc | 594 | fHist[i] = 0; |
595 | fHist[i] = (TH1D*)gROOT->FindObject(pattern[2+2*i]); | |
596 | ||
597 | if (!fHist[i]) { | |
598 | ||
599 | sprintf(buff, pattern[3+2*i], pdg); | |
600 | fHist[i] = (TH1D*)gROOT->FindObject(buff); | |
601 | ||
602 | if (!fHist[i]) Error(where, msg[1+i], pdg); | |
603 | } | |
604 | } | |
7816887f | 605 | } |
7e4131fc | 606 | |
607 | // 2d histogram | |
608 | ||
609 | if (fModel == 7) { | |
610 | ||
611 | fPtYHist = 0; | |
612 | fPtYHist = (TH2D*)gROOT->FindObject(pattern[6]); | |
613 | ||
614 | if (!fPtYHist) { | |
615 | ||
616 | sprintf(buff, pattern[7], pdg); | |
617 | fPtYHist = (TH2D*)gROOT->FindObject(buff); | |
618 | } | |
619 | ||
a3d75961 | 620 | if (!fPtYHist) Error(where, msg[3], pdg); |
7e4131fc | 621 | } |
622 | ||
623 | } | |
624 | ||
625 | ////////////////////////////////////////////////////////////////////////////////// | |
626 | ||
627 | void AliGenGeVSim:: AdjustFormula() { | |
628 | // | |
629 | // Private Function | |
630 | // Adjust fomula bounds according to acceptance cuts. | |
631 | // | |
632 | // Since GeVSim is producing "thermal" particles Pt | |
633 | // is cut at 3 GeV even when acceptance extends to grater momenta. | |
634 | // | |
635 | // WARNING ! | |
636 | // If custom formula was provided function preserves | |
637 | // original cuts. | |
638 | // | |
639 | ||
640 | const Double_t kMaxPt = 3.0; | |
641 | const Double_t kMaxY = 2.0; | |
642 | Double_t minPt, maxPt, minY, maxY; | |
643 | ||
644 | ||
645 | if (fModel > 4) return; | |
646 | ||
647 | // max Pt | |
648 | if (TestBit(kPtRange) && fPtMax < kMaxPt ) maxPt = fPtMax; | |
649 | else maxPt = kMaxPt; | |
650 | ||
651 | // min Pt | |
652 | if (TestBit(kPtRange)) minPt = fPtMin; | |
653 | else minPt = 0; | |
654 | ||
655 | if (TestBit(kPtRange) && fPtMin > kMaxPt ) | |
656 | Warning("Acceptance", "Minimum Pt (%3.2f GeV) greater that 3.0 GeV ", fPtMin); | |
657 | ||
658 | // Max Pt < Max P | |
659 | if (TestBit(kMomentumRange) && fPtMax < maxPt) maxPt = fPtMax; | |
660 | ||
661 | // max and min rapidity | |
662 | if (TestBit(kYRange)) { | |
663 | minY = fYMin; | |
664 | maxY = fYMax; | |
665 | } else { | |
666 | minY = -kMaxY; | |
667 | maxY = kMaxY; | |
668 | } | |
669 | ||
670 | // adjust formula | |
671 | ||
672 | if (fModel == 1) { | |
673 | fPtFormula->SetRange(fPtMin, maxPt); | |
674 | fYFormula->SetRange(fYMin, fYMax); | |
675 | } | |
676 | ||
677 | if (fModel > 1) | |
678 | ((TF2*)fCurrentForm)->SetRange(minPt, minY, maxPt, maxY); | |
679 | ||
680 | // azimuthal cut | |
681 | ||
682 | if (TestBit(kPhiRange)) | |
683 | fPhiFormula->SetRange(fPhiMin, fPhiMax); | |
684 | ||
685 | } | |
686 | ||
687 | ////////////////////////////////////////////////////////////////////////////////// | |
688 | ||
689 | void AliGenGeVSim::GetRandomPtY(Double_t &pt, Double_t &y) { | |
690 | // | |
691 | // Private function used by Generate() | |
692 | // | |
693 | // Returns random values of Pt and Y corresponding to selected | |
694 | // distribution. | |
695 | // | |
696 | ||
697 | if (fModel == 1) { | |
698 | pt = fPtFormula->GetRandom(); | |
699 | y = fYFormula->GetRandom(); | |
700 | return; | |
701 | } | |
702 | ||
703 | if (fModel > 1 && fModel < 6) { | |
704 | ((TF2*)fCurrentForm)->GetRandom2(pt, y); | |
705 | return; | |
706 | } | |
707 | ||
708 | if (fModel == 6) { | |
709 | pt = fHist[0]->GetRandom(); | |
710 | y = fHist[1]->GetRandom(); | |
711 | } | |
712 | ||
713 | if (fModel == 7) { | |
714 | fPtYHist->GetRandom2(pt, y); | |
715 | return; | |
716 | } | |
717 | } | |
718 | ||
719 | ////////////////////////////////////////////////////////////////////////////////// | |
720 | ||
721 | void AliGenGeVSim::Init() { | |
722 | // | |
723 | // Standard AliGenerator initializer. | |
724 | // does nothing | |
725 | // | |
7816887f | 726 | } |
727 | ||
728 | ////////////////////////////////////////////////////////////////////////////////// | |
729 | ||
730 | void AliGenGeVSim::Generate() { | |
4966b266 | 731 | // |
732 | // Standard AliGenerator function | |
733 | // This function do actual job and puts particles on stack. | |
734 | // | |
7816887f | 735 | |
7816887f | 736 | PDG_t pdg; // particle type |
737 | Float_t mass; // particle mass | |
738 | Float_t orgin[3] = {0,0,0}; // particle orgin [cm] | |
739 | Float_t polar[3] = {0,0,0}; // polarisation | |
7816887f | 740 | Float_t time = 0; // time of creation |
7816887f | 741 | |
7e4131fc | 742 | Float_t multiplicity = 0; |
743 | Bool_t isMultTotal = kTRUE; | |
744 | ||
7816887f | 745 | Float_t paramScaler; |
7e4131fc | 746 | Float_t directedScaller = 1., ellipticScaller = 1.; |
747 | ||
748 | TLorentzVector *v = new TLorentzVector(0,0,0,0); | |
7816887f | 749 | |
4966b266 | 750 | const Int_t kParent = -1; |
7816887f | 751 | Int_t id; |
752 | ||
7816887f | 753 | // vertexing |
7816887f | 754 | VertexInternal(); |
7816887f | 755 | orgin[0] = fVertex[0]; |
756 | orgin[1] = fVertex[1]; | |
757 | orgin[2] = fVertex[2]; | |
758 | ||
7816887f | 759 | |
760 | // Particle params database | |
761 | ||
762 | TDatabasePDG *db = TDatabasePDG::Instance(); | |
763 | TParticlePDG *type; | |
764 | AliGeVSimParticle *partType; | |
765 | ||
766 | Int_t nType, nParticle, nParam; | |
49039a84 | 767 | const Int_t kNParams = 6; |
7816887f | 768 | |
4966b266 | 769 | // reaction plane determination and model |
4966b266 | 770 | DetermineReactionPlane(); |
7e4131fc | 771 | |
7816887f | 772 | // loop over particle types |
773 | ||
774 | for (nType = 0; nType < fPartTypes->GetEntries(); nType++) { | |
775 | ||
776 | partType = (AliGeVSimParticle *)fPartTypes->At(nType); | |
777 | ||
778 | pdg = (PDG_t)partType->GetPdgCode(); | |
779 | type = db->GetParticle(pdg); | |
780 | mass = type->Mass(); | |
781 | ||
7e4131fc | 782 | fModel = partType->GetModel(); |
783 | SetFormula(pdg); | |
784 | fCurrentForm->SetParameter("mass", mass); | |
7816887f | 785 | |
7816887f | 786 | |
787 | // Evaluation of parameters - loop over parameters | |
788 | ||
49039a84 | 789 | for (nParam = 0; nParam < kNParams; nParam++) { |
7816887f | 790 | |
791 | paramScaler = FindScaler(nParam, pdg); | |
792 | ||
7e4131fc | 793 | if (nParam == 0) |
794 | fCurrentForm->SetParameter("temperature", paramScaler * partType->GetTemperature()); | |
7816887f | 795 | |
796 | if (nParam == 1 && fModel == 1) | |
7e4131fc | 797 | fYFormula->SetParameter("sigmaY", paramScaler * partType->GetSigmaY()); |
7816887f | 798 | |
799 | if (nParam == 2 && fModel == 4) { | |
800 | ||
7e4131fc | 801 | Double_t totalExpVal = paramScaler * partType->GetExpansionVelocity(); |
7816887f | 802 | |
803 | if (totalExpVal == 0.0) totalExpVal = 0.0001; | |
804 | if (totalExpVal == 1.0) totalExpVal = 9.9999; | |
805 | ||
7e4131fc | 806 | fCurrentForm->SetParameter("expVel", totalExpVal); |
7816887f | 807 | } |
808 | ||
809 | // flow | |
7e4131fc | 810 | |
811 | if (nParam == 3) directedScaller = paramScaler; | |
812 | if (nParam == 4) ellipticScaller = paramScaler; | |
7816887f | 813 | |
814 | // multiplicity | |
7e4131fc | 815 | |
816 | if (nParam == 5) { | |
817 | ||
818 | if (partType->IsMultForced()) isMultTotal = partType->IsMultTotal(); | |
819 | else isMultTotal = fIsMultTotal; | |
7816887f | 820 | |
7e4131fc | 821 | multiplicity = paramScaler * partType->GetMultiplicity(); |
822 | multiplicity *= (isMultTotal)? 1 : GetdNdYToTotal(); | |
823 | } | |
7816887f | 824 | } |
825 | ||
7e4131fc | 826 | // Flow defined on the particle type level (not parameterised) |
827 | if (partType->IsFlowSimple()) { | |
828 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(0,0) * directedScaller); | |
829 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(0,0) * ellipticScaller); | |
830 | } | |
831 | ||
832 | AdjustFormula(); | |
833 | ||
834 | ||
835 | Info("Generate","PDG = %d \t Mult = %d", pdg, (Int_t)multiplicity); | |
7816887f | 836 | |
837 | // loop over particles | |
838 | ||
839 | nParticle = 0; | |
7816887f | 840 | while (nParticle < multiplicity) { |
841 | ||
7e4131fc | 842 | Double_t pt, y, phi; // momentum in [pt,y,phi] |
843 | Float_t p[3] = {0,0,0}; // particle momentum | |
7816887f | 844 | |
7e4131fc | 845 | GetRandomPtY(pt, y); |
7816887f | 846 | |
7e4131fc | 847 | // phi distribution configuration when differential flow defined |
848 | // to be optimised in future release | |
7816887f | 849 | |
7e4131fc | 850 | if (!partType->IsFlowSimple()) { |
851 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(pt,y) * directedScaller); | |
852 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(pt,y) * ellipticScaller); | |
853 | } | |
7816887f | 854 | |
7e4131fc | 855 | phi = fPhiFormula->GetRandom(); |
7816887f | 856 | |
7e4131fc | 857 | if (!isMultTotal) nParticle++; |
858 | if (fModel > 4 && !CheckPtYPhi(pt,y,phi) ) continue; | |
859 | ||
7816887f | 860 | // coordinate transformation |
7816887f | 861 | v->SetPtEtaPhiM(pt, y, phi, mass); |
862 | ||
863 | p[0] = v->Px(); | |
864 | p[1] = v->Py(); | |
865 | p[2] = v->Pz(); | |
866 | ||
867 | // momentum range test | |
7e4131fc | 868 | if ( !CheckAcceptance(p) ) continue; |
7816887f | 869 | |
870 | // putting particle on the stack | |
871 | ||
642f15cf | 872 | PushTrack(fTrackIt, kParent, pdg, p, orgin, polar, time, kPPrimary, id, fTrackIt); |
7e4131fc | 873 | if (isMultTotal) nParticle++; |
7816887f | 874 | } |
875 | } | |
7e4131fc | 876 | |
daa61231 | 877 | // prepare and store header |
878 | ||
879 | AliGenGeVSimEventHeader *header = new AliGenGeVSimEventHeader("GeVSim header"); | |
880 | TArrayF eventVertex(3,orgin); | |
881 | ||
882 | header->SetPrimaryVertex(eventVertex); | |
883 | header->SetEventPlane(fPsi); | |
884 | header->SetEllipticFlow(fPhiFormula->GetParameter(2)); | |
885 | ||
886 | gAlice->SetGenEventHeader(header); | |
887 | ||
7e4131fc | 888 | delete v; |
7816887f | 889 | } |
890 | ||
891 | ////////////////////////////////////////////////////////////////////////////////// |