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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), | |
100 | fPartTypes(0) { | |
4966b266 | 101 | // |
102 | // Default constructor | |
103 | // | |
7816887f | 104 | |
7e4131fc | 105 | for (Int_t i=0; i<4; i++) |
7816887f | 106 | fPtYFormula[i] = 0; |
7ababb0c | 107 | for (Int_t i=0; i<2; i++) |
108 | fHist[i] = 0; | |
7816887f | 109 | } |
110 | ||
111 | ////////////////////////////////////////////////////////////////////////////////// | |
112 | ||
7e4131fc | 113 | AliGenGeVSim::AliGenGeVSim(Float_t psi, Bool_t isMultTotal) : AliGenerator(-1) { |
4966b266 | 114 | // |
115 | // Standard Constructor. | |
116 | // | |
7e4131fc | 117 | // models - thermal model to be used: |
4966b266 | 118 | // 1 - deconvoluted pt and Y source |
119 | // 2,3 - thermalized sphericaly symetric sources | |
120 | // 4 - thermalized source with expansion | |
121 | // 5 - custom model defined in TF2 object named "gevsimPtY" | |
7e4131fc | 122 | // 6 - custom model defined by two 1D histograms |
123 | // 7 - custom model defined by 2D histogram | |
4966b266 | 124 | // |
7e4131fc | 125 | // psi - reaction plane in degrees |
126 | // isMultTotal - multiplicity mode | |
127 | // kTRUE - total multiplicity (default) | |
128 | // kFALSE - dN/dY at midrapidity | |
129 | // | |
7816887f | 130 | |
131 | // checking consistancy | |
7e4131fc | 132 | |
4966b266 | 133 | if (psi < 0 || psi > 360 ) |
134 | Error ("AliGenGeVSim", "Reaction plane angle ( %d )out of range [0..360]", psi); | |
7816887f | 135 | |
daa61231 | 136 | fPsi = psi * TMath::Pi() / 180. ; |
7e4131fc | 137 | fIsMultTotal = isMultTotal; |
7816887f | 138 | |
139 | // initialization | |
140 | ||
141 | fPartTypes = new TObjArray(); | |
142 | InitFormula(); | |
7816887f | 143 | } |
144 | ||
145 | ////////////////////////////////////////////////////////////////////////////////// | |
146 | ||
147 | AliGenGeVSim::~AliGenGeVSim() { | |
4966b266 | 148 | // |
149 | // Default Destructor | |
150 | // | |
151 | // Removes TObjArray keeping list of registered particle types | |
152 | // | |
7816887f | 153 | |
154 | if (fPartTypes != NULL) delete fPartTypes; | |
155 | } | |
156 | ||
157 | ||
158 | ////////////////////////////////////////////////////////////////////////////////// | |
159 | ||
0af12c00 | 160 | Bool_t AliGenGeVSim::CheckPtYPhi(Float_t pt, Float_t y, Float_t phi) const { |
4966b266 | 161 | // |
162 | // private function used by Generate() | |
163 | // | |
164 | // Check bounds of Pt, Rapidity and Azimuthal Angle of a track | |
7e4131fc | 165 | // Used only when generating particles from a histogram |
4966b266 | 166 | // |
7816887f | 167 | |
168 | if ( TestBit(kPtRange) && ( pt < fPtMin || pt > fPtMax )) return kFALSE; | |
169 | if ( TestBit(kPhiRange) && ( phi < fPhiMin || phi > fPhiMax )) return kFALSE; | |
170 | if ( TestBit(kYRange) && ( y < fYMin || y > fYMax )) return kFALSE; | |
171 | ||
7816887f | 172 | return kTRUE; |
173 | } | |
174 | ||
175 | ////////////////////////////////////////////////////////////////////////////////// | |
176 | ||
7e4131fc | 177 | Bool_t AliGenGeVSim::CheckAcceptance(Float_t p[3]) { |
4966b266 | 178 | // |
179 | // private function used by Generate() | |
180 | // | |
7e4131fc | 181 | // Check bounds of a total momentum and theta of a track |
4966b266 | 182 | // |
7816887f | 183 | |
7e4131fc | 184 | if ( TestBit(kThetaRange) ) { |
185 | ||
186 | Double_t theta = TMath::ATan2( TMath::Sqrt(p[0]*p[0]+p[1]*p[1]), p[2]); | |
187 | if ( theta < fThetaMin || theta > fThetaMax ) return kFALSE; | |
188 | } | |
189 | ||
7816887f | 190 | |
7e4131fc | 191 | if ( TestBit(kMomentumRange) ) { |
192 | ||
193 | Double_t momentum = TMath::Sqrt(p[0]*p[0] + p[1]*p[1] + p[2]*p[2]); | |
194 | if ( momentum < fPMin || momentum > fPMax) return kFALSE; | |
195 | } | |
7816887f | 196 | |
197 | return kTRUE; | |
198 | } | |
199 | ||
200 | ////////////////////////////////////////////////////////////////////////////////// | |
201 | ||
7ababb0c | 202 | // Deconvoluted Pt Y formula |
203 | ||
204 | static Double_t aPtForm(Double_t * x, Double_t * par) { | |
205 | // ptForm: pt -> x[0] , mass -> [0] , temperature -> [1] | |
206 | // Description as string: " x * exp( -sqrt([0]*[0] + x*x) / [1] )" | |
207 | ||
208 | return x[0] * TMath::Exp( -sqrt(par[0]*par[0] + x[0]*x[0]) / par[1]); | |
209 | } | |
210 | ||
211 | static Double_t aYForm(Double_t * x, Double_t * par) { | |
212 | // y Form: y -> x[0] , sigmaY -> [0] | |
213 | // Description as string: " exp ( - x*x / (2 * [0]*[0] ) )" | |
214 | ||
215 | return TMath::Exp ( - x[0]*x[0] / (2 * par[0]*par[0] ) ); | |
216 | } | |
217 | ||
218 | // Models 1-3 | |
219 | // Description as strings: | |
220 | ||
221 | // const char *kFormE = " ( sqrt([0]*[0] + x*x) * cosh(y) ) "; | |
222 | // const char *kFormG = " ( 1 / sqrt( 1 - [2]*[2] ) ) "; | |
223 | // const char *kFormYp = "( [2]*sqrt(([0]*[0]+x*x)*cosh(y)*cosh(y)-[0]*[0])/([1]*sqrt(1-[2]*[2]))) "; | |
224 | ||
225 | // const char* kFormula[3] = { | |
226 | // " x * %s * exp( -%s / [1]) ", | |
227 | // " (x * %s) / ( exp( %s / [1]) - 1 ) ", | |
228 | // " x*%s*exp(-%s*%s/[1])*((sinh(%s)/%s)+([1]/(%s*%s))*(sinh(%s)/%s-cosh(%s)))" | |
229 | // }; | |
230 | // printf(kFormula[0], kFormE, kFormE); | |
231 | // printf(kFormula[1], kFormE, kFormE); | |
232 | // printf(kFormula[2], kFormE, kFormG, kFormE, kFormYp, kFormYp, kFormG, kFormE, kFormYp, kFormYp, kFormYp); | |
233 | ||
234 | ||
235 | static Double_t aPtYFormula0(Double_t *x, Double_t * par) { | |
236 | // pt -> x , Y -> y | |
237 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
238 | ||
239 | Double_t aFormE = TMath::Sqrt(par[0]*par[0] + x[0]*x[0]) * TMath::CosH(x[1]); | |
240 | return x[0] * aFormE * TMath::Exp(-aFormE/par[1]); | |
241 | } | |
242 | ||
243 | static Double_t aPtYFormula1(Double_t *x, Double_t * par) { | |
244 | // pt -> x , Y -> y | |
245 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
246 | ||
247 | Double_t aFormE = TMath::Sqrt(par[0]*par[0] + x[0]*x[0]) * TMath::CosH(x[1]); | |
248 | return x[0] * aFormE / ( TMath::Exp( aFormE / par[1]) - 1 ); | |
249 | } | |
250 | ||
251 | static Double_t aPtYFormula2(Double_t *x, Double_t * par) { | |
252 | // pt -> x , Y -> y | |
253 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
254 | ||
255 | Double_t aFormE = TMath::Sqrt(par[0]*par[0] + x[0]*x[0]) * TMath::CosH(x[1]); | |
256 | Double_t aFormG = 1 / TMath::Sqrt( 1 - par[2]*par[2] ); | |
257 | Double_t aFormYp = par[2]*TMath::Sqrt( (par[0]*par[0] + x[0]*x[0]) | |
258 | * TMath::CosH(x[1])*TMath::CosH(x[1]) | |
259 | - par[0]*par[0] ) | |
260 | /( par[1]*TMath::Sqrt(1-par[2]*par[2])); | |
261 | ||
262 | return x[0] * aFormE * TMath::Exp( - aFormG * aFormE / par[1]) | |
263 | *( TMath::SinH(aFormYp)/aFormYp | |
264 | + par[1]/(aFormG*aFormE) | |
265 | * ( TMath::SinH(aFormYp)/aFormYp-TMath::CosH(aFormYp) ) ); | |
266 | } | |
267 | ||
268 | // Phi Flow Formula | |
269 | ||
270 | static Double_t aPhiForm(Double_t * x, Double_t * par) { | |
271 | // phi -> x | |
272 | // Psi -> [0] , Direct Flow -> [1] , Elliptical Flow -> [2] | |
273 | // Description as string: " 1 + 2*[1]*cos(x-[0]) + 2*[2]*cos(2*(x-[0])) " | |
274 | ||
275 | return 1 + 2*par[1]*TMath::Cos(x[0]-par[0]) | |
276 | + 2*par[2]*TMath::Cos(2*(x[0]-par[0])); | |
277 | } | |
278 | ||
7816887f | 279 | void AliGenGeVSim::InitFormula() { |
4966b266 | 280 | // |
281 | // private function | |
282 | // | |
283 | // Initalizes formulas used in GeVSim. | |
7816887f | 284 | |
285 | // Deconvoluted Pt Y formula | |
286 | ||
7ababb0c | 287 | fPtFormula = new TF1("gevsimPt", &aPtForm, 0, 3, 2); |
288 | fYFormula = new TF1("gevsimRapidity", &aYForm, -3, 3,1); | |
7816887f | 289 | |
7e4131fc | 290 | fPtFormula->SetParNames("mass", "temperature"); |
7816887f | 291 | fPtFormula->SetParameters(1., 1.); |
292 | ||
7e4131fc | 293 | fYFormula->SetParName(0, "sigmaY"); |
7816887f | 294 | fYFormula->SetParameter(0, 1.); |
295 | ||
296 | // Grid for Pt and Y | |
297 | fPtFormula->SetNpx(100); | |
298 | fYFormula->SetNpx(100); | |
299 | ||
300 | ||
301 | // Models 1-3 | |
302 | ||
7ababb0c | 303 | fPtYFormula[0] = new TF2("gevsimPtY_2", &aPtYFormula0, 0, 3, -2, 2, 2); |
7816887f | 304 | |
7ababb0c | 305 | fPtYFormula[1] = new TF2("gevsimPtY_3", &aPtYFormula1, 0, 3, -2, 2, 2); |
7816887f | 306 | |
7ababb0c | 307 | fPtYFormula[2] = new TF2("gevsimPtY_4", &aPtYFormula2, 0, 3, -2, 2, 3); |
7816887f | 308 | |
309 | fPtYFormula[3] = 0; | |
310 | ||
311 | ||
312 | // setting names & initialisation | |
313 | ||
7ababb0c | 314 | const char* kParamNames[3] = {"mass", "temperature", "expVel"}; |
315 | ||
7816887f | 316 | Int_t i, j; |
317 | for (i=0; i<3; i++) { | |
318 | ||
7e4131fc | 319 | fPtYFormula[i]->SetNpx(100); // step 30 MeV |
320 | fPtYFormula[i]->SetNpy(100); // | |
7816887f | 321 | |
322 | for (j=0; j<3; j++) { | |
323 | ||
324 | if ( i != 2 && j == 2 ) continue; // ExpVel | |
49039a84 | 325 | fPtYFormula[i]->SetParName(j, kParamNames[j]); |
7816887f | 326 | fPtYFormula[i]->SetParameter(j, 0.5); |
327 | } | |
328 | } | |
329 | ||
330 | // Phi Flow Formula | |
331 | ||
7ababb0c | 332 | fPhiFormula = new TF1("gevsimPhi", &aPhiForm, 0, 2*TMath::Pi(), 3); |
7816887f | 333 | |
7e4131fc | 334 | fPhiFormula->SetParNames("psi", "directed", "elliptic"); |
335 | fPhiFormula->SetParameters(0., 0., 0.); | |
7816887f | 336 | |
7e4131fc | 337 | fPhiFormula->SetNpx(180); |
7816887f | 338 | |
339 | } | |
340 | ||
341 | ////////////////////////////////////////////////////////////////////////////////// | |
342 | ||
343 | void AliGenGeVSim::AddParticleType(AliGeVSimParticle *part) { | |
4966b266 | 344 | // |
345 | // Adds new type of particles. | |
346 | // | |
347 | // Parameters are defeined in AliGeVSimParticle object | |
348 | // This method has to be called for every particle type | |
349 | // | |
7816887f | 350 | |
351 | if (fPartTypes == NULL) | |
352 | fPartTypes = new TObjArray(); | |
353 | ||
354 | fPartTypes->Add(part); | |
7e4131fc | 355 | } |
356 | ||
357 | ////////////////////////////////////////////////////////////////////////////////// | |
7816887f | 358 | |
7e4131fc | 359 | void AliGenGeVSim::SetMultTotal(Bool_t isTotal) { |
360 | // | |
361 | // | |
362 | // | |
363 | ||
364 | fIsMultTotal = isTotal; | |
7816887f | 365 | } |
366 | ||
367 | ////////////////////////////////////////////////////////////////////////////////// | |
368 | ||
369 | Float_t AliGenGeVSim::FindScaler(Int_t paramId, Int_t pdg) { | |
4966b266 | 370 | // |
371 | // private function | |
372 | // Finds Scallar for a given parameter. | |
373 | // Function used in event-by-event mode. | |
374 | // | |
375 | // There are two types of scallars: deterministic and random | |
376 | // and they can work on either global or particle type level. | |
377 | // For every variable there are four scallars defined. | |
378 | // | |
379 | // Scallars are named as folowa | |
380 | // deterministic global level : "gevsimParam" (eg. "gevsimTemp") | |
381 | // deterinistig type level : "gevsimPdgParam" (eg. "gevsim211Mult") | |
382 | // random global level : "gevsimParamRndm" (eg. "gevsimMultRndm") | |
383 | // random type level : "gevsimPdgParamRndm" (eg. "gevsim-211V2Rndm"); | |
384 | // | |
385 | // Pdg - code of a particle type in PDG standard (see: http://pdg.lbl.gov) | |
386 | // Param - parameter name. Allowed parameters: | |
387 | // | |
388 | // "Temp" - inverse slope parameter | |
389 | // "SigmaY" - rapidity width - for model (1) only | |
390 | // "ExpVel" - expansion velocity - for model (4) only | |
391 | // "V1" - directed flow | |
392 | // "V2" - elliptic flow | |
393 | // "Mult" - multiplicity | |
394 | // | |
395 | ||
396 | ||
7816887f | 397 | static const char* params[] = {"Temp", "SigmaY", "ExpVel", "V1", "V2", "Mult"}; |
398 | static const char* ending[] = {"", "Rndm"}; | |
399 | ||
400 | static const char* patt1 = "gevsim%s%s"; | |
401 | static const char* patt2 = "gevsim%d%s%s"; | |
402 | ||
403 | char buffer[80]; | |
404 | TF1 *form; | |
405 | ||
406 | Float_t scaler = 1.; | |
407 | ||
408 | // Scaler evoluation: i - global/local, j - determ/random | |
409 | ||
410 | Int_t i, j; | |
411 | ||
412 | for (i=0; i<2; i++) { | |
413 | for (j=0; j<2; j++) { | |
414 | ||
415 | form = 0; | |
416 | ||
417 | if (i == 0) sprintf(buffer, patt1, params[paramId], ending[j]); | |
418 | else sprintf(buffer, patt2, pdg, params[paramId], ending[j]); | |
419 | ||
420 | form = (TF1 *)gROOT->GetFunction(buffer); | |
421 | ||
422 | if (form != 0) { | |
423 | if (j == 0) scaler *= form->Eval(gAlice->GetEvNumber()); | |
424 | if (j == 1) { | |
425 | form->SetParameter(0, gAlice->GetEvNumber()); | |
426 | scaler *= form->GetRandom(); | |
427 | } | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
432 | return scaler; | |
433 | } | |
434 | ||
435 | ////////////////////////////////////////////////////////////////////////////////// | |
436 | ||
4966b266 | 437 | void AliGenGeVSim::DetermineReactionPlane() { |
438 | // | |
439 | // private function used by Generate() | |
440 | // | |
441 | // Retermines Reaction Plane angle and set this value | |
442 | // as a parameter [0] in fPhiFormula | |
443 | // | |
444 | // Note: if "gevsimPsiRndm" function is found it override both | |
445 | // "gevsimPhi" function and initial fPsi value | |
446 | // | |
447 | ||
448 | TF1 *form; | |
449 | ||
450 | form = 0; | |
451 | form = (TF1 *)gROOT->GetFunction("gevsimPsi"); | |
daa61231 | 452 | if (form) fPsi = form->Eval(gAlice->GetEvNumber()) * TMath::Pi() / 180; |
4966b266 | 453 | |
7e4131fc | 454 | form = 0; |
4966b266 | 455 | form = (TF1 *)gROOT->GetFunction("gevsimPsiRndm"); |
daa61231 | 456 | if (form) fPsi = form->GetRandom() * TMath::Pi() / 180; |
457 | ||
458 | ||
459 | cout << "Psi = " << fPsi << "\t" << (Int_t)(fPsi*180./TMath::Pi()) << endl; | |
4966b266 | 460 | |
461 | fPhiFormula->SetParameter(0, fPsi); | |
462 | } | |
463 | ||
464 | ////////////////////////////////////////////////////////////////////////////////// | |
465 | ||
7e4131fc | 466 | Float_t AliGenGeVSim::GetdNdYToTotal() { |
4966b266 | 467 | // |
7e4131fc | 468 | // Private, helper function used by Generate() |
4966b266 | 469 | // |
7e4131fc | 470 | // Returns total multiplicity to dN/dY ration using current distribution. |
471 | // The function have to be called after setting distribution and its | |
472 | // parameters (like temperature). | |
473 | // | |
474 | ||
475 | Float_t integ, mag; | |
49039a84 | 476 | const Double_t kMaxPt = 3.0, kMaxY = 2.; |
7e4131fc | 477 | |
478 | if (fModel == 1) { | |
479 | ||
49039a84 | 480 | integ = fYFormula->Integral(-kMaxY, kMaxY); |
7e4131fc | 481 | mag = fYFormula->Eval(0); |
482 | return integ/mag; | |
483 | } | |
484 | ||
485 | // 2D formula standard or custom | |
486 | ||
487 | if (fModel > 1 && fModel < 6) { | |
488 | ||
49039a84 | 489 | integ = ((TF2*)fCurrentForm)->Integral(0,kMaxPt, -kMaxY, kMaxY); |
490 | mag = ((TF2*)fCurrentForm)->Integral(0, kMaxPt, -0.1, 0.1) / 0.2; | |
7e4131fc | 491 | return integ/mag; |
492 | } | |
493 | ||
494 | // 2 1D histograms | |
495 | ||
496 | if (fModel == 6) { | |
497 | ||
498 | integ = fHist[1]->Integral(); | |
499 | mag = fHist[0]->GetBinContent(fHist[0]->FindBin(0.)); | |
500 | mag /= fHist[0]->GetBinWidth(fHist[0]->FindBin(0.)); | |
501 | return integ/mag; | |
502 | } | |
503 | ||
504 | // 2D histogram | |
4966b266 | 505 | |
7e4131fc | 506 | if (fModel == 7) { |
507 | ||
508 | // Not tested ... | |
509 | Int_t yBins = fPtYHist->GetNbinsY(); | |
510 | Int_t ptBins = fPtYHist->GetNbinsX(); | |
511 | ||
512 | integ = fPtYHist->Integral(0, ptBins, 0, yBins); | |
513 | mag = fPtYHist->Integral(0, ptBins, (yBins/2)-1, (yBins/2)+1 ) / 2; | |
514 | return integ/mag; | |
515 | } | |
516 | ||
517 | return 1; | |
4966b266 | 518 | } |
519 | ||
520 | ////////////////////////////////////////////////////////////////////////////////// | |
521 | ||
7e4131fc | 522 | void AliGenGeVSim::SetFormula(Int_t pdg) { |
4966b266 | 523 | // |
7e4131fc | 524 | // Private function used by Generate() |
4966b266 | 525 | // |
7e4131fc | 526 | // Configure a formula for a given particle type and model Id (in fModel). |
527 | // If custom formula or histogram was selected the function tries | |
528 | // to find it. | |
529 | // | |
530 | // The function implements naming conventions for custom distributions names | |
531 | // | |
7816887f | 532 | |
7e4131fc | 533 | char buff[40]; |
534 | const char* msg[4] = { | |
535 | "Custom Formula for Pt Y distribution not found [pdg = %d]", | |
536 | "Histogram for Pt distribution not found [pdg = %d]", | |
537 | "Histogram for Y distribution not found [pdg = %d]", | |
538 | "HIstogram for Pt Y dostribution not found [pdg = %d]" | |
539 | }; | |
540 | ||
541 | const char* pattern[8] = { | |
542 | "gevsimDistPtY", "gevsimDist%dPtY", | |
543 | "gevsimHistPt", "gevsimHist%dPt", | |
544 | "gevsimHistY", "gevsimHist%dY", | |
545 | "gevsimHistPtY", "gevsimHist%dPtY" | |
546 | }; | |
547 | ||
548 | const char *where = "SetFormula"; | |
7816887f | 549 | |
7816887f | 550 | |
7e4131fc | 551 | if (fModel < 1 || fModel > 7) |
552 | Error("SetFormula", "Model Id (%d) out of range [1-7]", fModel); | |
553 | ||
554 | ||
555 | // standard models | |
556 | ||
557 | if (fModel == 1) fCurrentForm = fPtFormula; | |
558 | if (fModel > 1 && fModel < 5) fCurrentForm = fPtYFormula[fModel-2]; | |
559 | ||
560 | ||
561 | // custom model defined by a formula | |
562 | ||
7816887f | 563 | if (fModel == 5) { |
564 | ||
7e4131fc | 565 | fCurrentForm = 0; |
566 | fCurrentForm = (TF2*)gROOT->GetFunction(pattern[0]); | |
567 | ||
568 | if (!fCurrentForm) { | |
569 | ||
570 | sprintf(buff, pattern[1], pdg); | |
571 | fCurrentForm = (TF2*)gROOT->GetFunction(buff); | |
572 | ||
573 | if (!fCurrentForm) Error(where, msg[0], pdg); | |
574 | } | |
575 | } | |
576 | ||
577 | // 2 1D histograms | |
578 | ||
579 | if (fModel == 6) { | |
7816887f | 580 | |
7e4131fc | 581 | for (Int_t i=0; i<2; i++) { |
7816887f | 582 | |
7e4131fc | 583 | fHist[i] = 0; |
584 | fHist[i] = (TH1D*)gROOT->FindObject(pattern[2+2*i]); | |
585 | ||
586 | if (!fHist[i]) { | |
587 | ||
588 | sprintf(buff, pattern[3+2*i], pdg); | |
589 | fHist[i] = (TH1D*)gROOT->FindObject(buff); | |
590 | ||
591 | if (!fHist[i]) Error(where, msg[1+i], pdg); | |
592 | } | |
593 | } | |
7816887f | 594 | } |
7e4131fc | 595 | |
596 | // 2d histogram | |
597 | ||
598 | if (fModel == 7) { | |
599 | ||
600 | fPtYHist = 0; | |
601 | fPtYHist = (TH2D*)gROOT->FindObject(pattern[6]); | |
602 | ||
603 | if (!fPtYHist) { | |
604 | ||
605 | sprintf(buff, pattern[7], pdg); | |
606 | fPtYHist = (TH2D*)gROOT->FindObject(buff); | |
607 | } | |
608 | ||
a3d75961 | 609 | if (!fPtYHist) Error(where, msg[3], pdg); |
7e4131fc | 610 | } |
611 | ||
612 | } | |
613 | ||
614 | ////////////////////////////////////////////////////////////////////////////////// | |
615 | ||
616 | void AliGenGeVSim:: AdjustFormula() { | |
617 | // | |
618 | // Private Function | |
619 | // Adjust fomula bounds according to acceptance cuts. | |
620 | // | |
621 | // Since GeVSim is producing "thermal" particles Pt | |
622 | // is cut at 3 GeV even when acceptance extends to grater momenta. | |
623 | // | |
624 | // WARNING ! | |
625 | // If custom formula was provided function preserves | |
626 | // original cuts. | |
627 | // | |
628 | ||
629 | const Double_t kMaxPt = 3.0; | |
630 | const Double_t kMaxY = 2.0; | |
631 | Double_t minPt, maxPt, minY, maxY; | |
632 | ||
633 | ||
634 | if (fModel > 4) return; | |
635 | ||
636 | // max Pt | |
637 | if (TestBit(kPtRange) && fPtMax < kMaxPt ) maxPt = fPtMax; | |
638 | else maxPt = kMaxPt; | |
639 | ||
640 | // min Pt | |
641 | if (TestBit(kPtRange)) minPt = fPtMin; | |
642 | else minPt = 0; | |
643 | ||
644 | if (TestBit(kPtRange) && fPtMin > kMaxPt ) | |
645 | Warning("Acceptance", "Minimum Pt (%3.2f GeV) greater that 3.0 GeV ", fPtMin); | |
646 | ||
647 | // Max Pt < Max P | |
648 | if (TestBit(kMomentumRange) && fPtMax < maxPt) maxPt = fPtMax; | |
649 | ||
650 | // max and min rapidity | |
651 | if (TestBit(kYRange)) { | |
652 | minY = fYMin; | |
653 | maxY = fYMax; | |
654 | } else { | |
655 | minY = -kMaxY; | |
656 | maxY = kMaxY; | |
657 | } | |
658 | ||
659 | // adjust formula | |
660 | ||
661 | if (fModel == 1) { | |
662 | fPtFormula->SetRange(fPtMin, maxPt); | |
663 | fYFormula->SetRange(fYMin, fYMax); | |
664 | } | |
665 | ||
666 | if (fModel > 1) | |
667 | ((TF2*)fCurrentForm)->SetRange(minPt, minY, maxPt, maxY); | |
668 | ||
669 | // azimuthal cut | |
670 | ||
671 | if (TestBit(kPhiRange)) | |
672 | fPhiFormula->SetRange(fPhiMin, fPhiMax); | |
673 | ||
674 | } | |
675 | ||
676 | ////////////////////////////////////////////////////////////////////////////////// | |
677 | ||
678 | void AliGenGeVSim::GetRandomPtY(Double_t &pt, Double_t &y) { | |
679 | // | |
680 | // Private function used by Generate() | |
681 | // | |
682 | // Returns random values of Pt and Y corresponding to selected | |
683 | // distribution. | |
684 | // | |
685 | ||
686 | if (fModel == 1) { | |
687 | pt = fPtFormula->GetRandom(); | |
688 | y = fYFormula->GetRandom(); | |
689 | return; | |
690 | } | |
691 | ||
692 | if (fModel > 1 && fModel < 6) { | |
693 | ((TF2*)fCurrentForm)->GetRandom2(pt, y); | |
694 | return; | |
695 | } | |
696 | ||
697 | if (fModel == 6) { | |
698 | pt = fHist[0]->GetRandom(); | |
699 | y = fHist[1]->GetRandom(); | |
700 | } | |
701 | ||
702 | if (fModel == 7) { | |
703 | fPtYHist->GetRandom2(pt, y); | |
704 | return; | |
705 | } | |
706 | } | |
707 | ||
708 | ////////////////////////////////////////////////////////////////////////////////// | |
709 | ||
710 | void AliGenGeVSim::Init() { | |
711 | // | |
712 | // Standard AliGenerator initializer. | |
713 | // does nothing | |
714 | // | |
7816887f | 715 | } |
716 | ||
717 | ////////////////////////////////////////////////////////////////////////////////// | |
718 | ||
719 | void AliGenGeVSim::Generate() { | |
4966b266 | 720 | // |
721 | // Standard AliGenerator function | |
722 | // This function do actual job and puts particles on stack. | |
723 | // | |
7816887f | 724 | |
7816887f | 725 | PDG_t pdg; // particle type |
726 | Float_t mass; // particle mass | |
727 | Float_t orgin[3] = {0,0,0}; // particle orgin [cm] | |
728 | Float_t polar[3] = {0,0,0}; // polarisation | |
7816887f | 729 | Float_t time = 0; // time of creation |
7816887f | 730 | |
7e4131fc | 731 | Float_t multiplicity = 0; |
732 | Bool_t isMultTotal = kTRUE; | |
733 | ||
7816887f | 734 | Float_t paramScaler; |
7e4131fc | 735 | Float_t directedScaller = 1., ellipticScaller = 1.; |
736 | ||
737 | TLorentzVector *v = new TLorentzVector(0,0,0,0); | |
7816887f | 738 | |
4966b266 | 739 | const Int_t kParent = -1; |
7816887f | 740 | Int_t id; |
741 | ||
7816887f | 742 | // vertexing |
7816887f | 743 | VertexInternal(); |
7816887f | 744 | orgin[0] = fVertex[0]; |
745 | orgin[1] = fVertex[1]; | |
746 | orgin[2] = fVertex[2]; | |
747 | ||
7816887f | 748 | |
749 | // Particle params database | |
750 | ||
751 | TDatabasePDG *db = TDatabasePDG::Instance(); | |
752 | TParticlePDG *type; | |
753 | AliGeVSimParticle *partType; | |
754 | ||
755 | Int_t nType, nParticle, nParam; | |
49039a84 | 756 | const Int_t kNParams = 6; |
7816887f | 757 | |
4966b266 | 758 | // reaction plane determination and model |
4966b266 | 759 | DetermineReactionPlane(); |
7e4131fc | 760 | |
7816887f | 761 | // loop over particle types |
762 | ||
763 | for (nType = 0; nType < fPartTypes->GetEntries(); nType++) { | |
764 | ||
765 | partType = (AliGeVSimParticle *)fPartTypes->At(nType); | |
766 | ||
767 | pdg = (PDG_t)partType->GetPdgCode(); | |
768 | type = db->GetParticle(pdg); | |
769 | mass = type->Mass(); | |
770 | ||
7e4131fc | 771 | fModel = partType->GetModel(); |
772 | SetFormula(pdg); | |
773 | fCurrentForm->SetParameter("mass", mass); | |
7816887f | 774 | |
7816887f | 775 | |
776 | // Evaluation of parameters - loop over parameters | |
777 | ||
49039a84 | 778 | for (nParam = 0; nParam < kNParams; nParam++) { |
7816887f | 779 | |
780 | paramScaler = FindScaler(nParam, pdg); | |
781 | ||
7e4131fc | 782 | if (nParam == 0) |
783 | fCurrentForm->SetParameter("temperature", paramScaler * partType->GetTemperature()); | |
7816887f | 784 | |
785 | if (nParam == 1 && fModel == 1) | |
7e4131fc | 786 | fYFormula->SetParameter("sigmaY", paramScaler * partType->GetSigmaY()); |
7816887f | 787 | |
788 | if (nParam == 2 && fModel == 4) { | |
789 | ||
7e4131fc | 790 | Double_t totalExpVal = paramScaler * partType->GetExpansionVelocity(); |
7816887f | 791 | |
792 | if (totalExpVal == 0.0) totalExpVal = 0.0001; | |
793 | if (totalExpVal == 1.0) totalExpVal = 9.9999; | |
794 | ||
7e4131fc | 795 | fCurrentForm->SetParameter("expVel", totalExpVal); |
7816887f | 796 | } |
797 | ||
798 | // flow | |
7e4131fc | 799 | |
800 | if (nParam == 3) directedScaller = paramScaler; | |
801 | if (nParam == 4) ellipticScaller = paramScaler; | |
7816887f | 802 | |
803 | // multiplicity | |
7e4131fc | 804 | |
805 | if (nParam == 5) { | |
806 | ||
807 | if (partType->IsMultForced()) isMultTotal = partType->IsMultTotal(); | |
808 | else isMultTotal = fIsMultTotal; | |
7816887f | 809 | |
7e4131fc | 810 | multiplicity = paramScaler * partType->GetMultiplicity(); |
811 | multiplicity *= (isMultTotal)? 1 : GetdNdYToTotal(); | |
812 | } | |
7816887f | 813 | } |
814 | ||
7e4131fc | 815 | // Flow defined on the particle type level (not parameterised) |
816 | if (partType->IsFlowSimple()) { | |
817 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(0,0) * directedScaller); | |
818 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(0,0) * ellipticScaller); | |
819 | } | |
820 | ||
821 | AdjustFormula(); | |
822 | ||
823 | ||
824 | Info("Generate","PDG = %d \t Mult = %d", pdg, (Int_t)multiplicity); | |
7816887f | 825 | |
826 | // loop over particles | |
827 | ||
828 | nParticle = 0; | |
7816887f | 829 | while (nParticle < multiplicity) { |
830 | ||
7e4131fc | 831 | Double_t pt, y, phi; // momentum in [pt,y,phi] |
832 | Float_t p[3] = {0,0,0}; // particle momentum | |
7816887f | 833 | |
7e4131fc | 834 | GetRandomPtY(pt, y); |
7816887f | 835 | |
7e4131fc | 836 | // phi distribution configuration when differential flow defined |
837 | // to be optimised in future release | |
7816887f | 838 | |
7e4131fc | 839 | if (!partType->IsFlowSimple()) { |
840 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(pt,y) * directedScaller); | |
841 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(pt,y) * ellipticScaller); | |
842 | } | |
7816887f | 843 | |
7e4131fc | 844 | phi = fPhiFormula->GetRandom(); |
7816887f | 845 | |
7e4131fc | 846 | if (!isMultTotal) nParticle++; |
847 | if (fModel > 4 && !CheckPtYPhi(pt,y,phi) ) continue; | |
848 | ||
7816887f | 849 | // coordinate transformation |
7816887f | 850 | v->SetPtEtaPhiM(pt, y, phi, mass); |
851 | ||
852 | p[0] = v->Px(); | |
853 | p[1] = v->Py(); | |
854 | p[2] = v->Pz(); | |
855 | ||
856 | // momentum range test | |
7e4131fc | 857 | if ( !CheckAcceptance(p) ) continue; |
7816887f | 858 | |
859 | // putting particle on the stack | |
860 | ||
642f15cf | 861 | PushTrack(fTrackIt, kParent, pdg, p, orgin, polar, time, kPPrimary, id, fTrackIt); |
7e4131fc | 862 | if (isMultTotal) nParticle++; |
7816887f | 863 | } |
864 | } | |
7e4131fc | 865 | |
daa61231 | 866 | // prepare and store header |
867 | ||
868 | AliGenGeVSimEventHeader *header = new AliGenGeVSimEventHeader("GeVSim header"); | |
869 | TArrayF eventVertex(3,orgin); | |
870 | ||
871 | header->SetPrimaryVertex(eventVertex); | |
872 | header->SetEventPlane(fPsi); | |
873 | header->SetEllipticFlow(fPhiFormula->GetParameter(2)); | |
874 | ||
875 | gAlice->SetGenEventHeader(header); | |
876 | ||
7e4131fc | 877 | delete v; |
7816887f | 878 | } |
879 | ||
880 | ////////////////////////////////////////////////////////////////////////////////// |