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Commit | Line | Data |
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7e4131fc | 1 | |
4966b266 | 2 | //////////////////////////////////////////////////////////////////////////////// |
3 | // | |
7e4131fc | 4 | // AliGenGeVSim is a class implementing GeVSim event generator. |
5 | // | |
6 | // GeVSim is a simple Monte-Carlo event generator for testing detector and | |
7 | // algorythm performance especialy concerning flow and event-by-event studies | |
4966b266 | 8 | // |
9 | // In this event generator particles are generated from thermal distributions | |
10 | // without any dynamics and addicional constrains. Distribution parameters like | |
11 | // multiplicity, particle type yields, inverse slope parameters, flow coeficients | |
12 | // and expansion velocities are expleicite defined by the user. | |
13 | // | |
14 | // GeVSim contains four thermal distributions the same as | |
15 | // MevSim event generator developed for STAR experiment. | |
16 | // | |
7e4131fc | 17 | // In addition custom distributions can be used be the mean |
18 | // either two dimensional formula (TF2), a two dimensional histogram or | |
19 | // two one dimensional histograms. | |
4966b266 | 20 | // |
21 | // Azimuthal distribution is deconvoluted from (Pt,Y) distribution | |
22 | // and is described by two Fourier coefficients representing | |
7e4131fc | 23 | // Directed and Elliptic flow. |
4966b266 | 24 | // |
7e4131fc | 25 | //////////////////////////////////////////////////////////////////////////////// |
26 | // | |
4966b266 | 27 | // To apply flow to event ganerated by an arbitraly event generator |
28 | // refer to AliGenAfterBurnerFlow class. | |
29 | // | |
7e4131fc | 30 | //////////////////////////////////////////////////////////////////////////////// |
31 | // | |
4966b266 | 32 | // For examples, parameters and testing macros refer to: |
33 | // http:/home.cern.ch/radomski | |
7e4131fc | 34 | // |
35 | // for more detailed description refer to ALICE NOTE | |
36 | // "GeVSim Monte-Carlo Event Generator" | |
37 | // S.Radosmki, P. Foka. | |
4966b266 | 38 | // |
39 | // Author: | |
40 | // Sylwester Radomski, | |
41 | // GSI, March 2002 | |
42 | // | |
43 | // S.Radomski@gsi.de | |
44 | // | |
45 | //////////////////////////////////////////////////////////////////////////////// | |
7e4131fc | 46 | // |
47 | // Updated and revised: September 2002, S. Radomski, GSI | |
48 | // | |
49 | //////////////////////////////////////////////////////////////////////////////// | |
50 | ||
7816887f | 51 | |
7e4131fc | 52 | #include <iostream.h> |
7816887f | 53 | |
54 | #include "TROOT.h" | |
55 | #include "TCanvas.h" | |
56 | #include "TParticle.h" | |
4966b266 | 57 | #include "TObjArray.h" |
58 | #include "TF1.h" | |
59 | #include "TF2.h" | |
7e4131fc | 60 | #include "TH1.h" |
61 | #include "TH2.h" | |
4966b266 | 62 | |
7816887f | 63 | #include "AliRun.h" |
64 | #include "AliPDG.h" | |
4966b266 | 65 | #include "AliGenerator.h" |
66 | ||
67 | #include "AliGenGeVSim.h" | |
68 | #include "AliGeVSimParticle.h" | |
69 | ||
7816887f | 70 | |
71 | ClassImp(AliGenGeVSim); | |
72 | ||
73 | ////////////////////////////////////////////////////////////////////////////////// | |
74 | ||
75 | AliGenGeVSim::AliGenGeVSim() : AliGenerator(-1) { | |
4966b266 | 76 | // |
77 | // Default constructor | |
78 | // | |
7816887f | 79 | |
7816887f | 80 | fPsi = 0; |
7e4131fc | 81 | fIsMultTotal = kTRUE; |
7816887f | 82 | |
83 | //PH InitFormula(); | |
7e4131fc | 84 | for (Int_t i=0; i<4; i++) |
7816887f | 85 | fPtYFormula[i] = 0; |
86 | } | |
87 | ||
88 | ////////////////////////////////////////////////////////////////////////////////// | |
89 | ||
7e4131fc | 90 | AliGenGeVSim::AliGenGeVSim(Float_t psi, Bool_t isMultTotal) : AliGenerator(-1) { |
4966b266 | 91 | // |
92 | // Standard Constructor. | |
93 | // | |
7e4131fc | 94 | // models - thermal model to be used: |
4966b266 | 95 | // 1 - deconvoluted pt and Y source |
96 | // 2,3 - thermalized sphericaly symetric sources | |
97 | // 4 - thermalized source with expansion | |
98 | // 5 - custom model defined in TF2 object named "gevsimPtY" | |
7e4131fc | 99 | // 6 - custom model defined by two 1D histograms |
100 | // 7 - custom model defined by 2D histogram | |
4966b266 | 101 | // |
7e4131fc | 102 | // psi - reaction plane in degrees |
103 | // isMultTotal - multiplicity mode | |
104 | // kTRUE - total multiplicity (default) | |
105 | // kFALSE - dN/dY at midrapidity | |
106 | // | |
7816887f | 107 | |
108 | // checking consistancy | |
7e4131fc | 109 | |
4966b266 | 110 | if (psi < 0 || psi > 360 ) |
111 | Error ("AliGenGeVSim", "Reaction plane angle ( %d )out of range [0..360]", psi); | |
7816887f | 112 | |
4966b266 | 113 | fPsi = psi * 2 * TMath::Pi() / 360. ; |
7e4131fc | 114 | fIsMultTotal = isMultTotal; |
7816887f | 115 | |
116 | // initialization | |
117 | ||
118 | fPartTypes = new TObjArray(); | |
119 | InitFormula(); | |
7816887f | 120 | } |
121 | ||
122 | ////////////////////////////////////////////////////////////////////////////////// | |
123 | ||
124 | AliGenGeVSim::~AliGenGeVSim() { | |
4966b266 | 125 | // |
126 | // Default Destructor | |
127 | // | |
128 | // Removes TObjArray keeping list of registered particle types | |
129 | // | |
7816887f | 130 | |
131 | if (fPartTypes != NULL) delete fPartTypes; | |
132 | } | |
133 | ||
134 | ||
135 | ////////////////////////////////////////////////////////////////////////////////// | |
136 | ||
137 | Bool_t AliGenGeVSim::CheckPtYPhi(Float_t pt, Float_t y, Float_t phi) { | |
4966b266 | 138 | // |
139 | // private function used by Generate() | |
140 | // | |
141 | // Check bounds of Pt, Rapidity and Azimuthal Angle of a track | |
7e4131fc | 142 | // Used only when generating particles from a histogram |
4966b266 | 143 | // |
7816887f | 144 | |
145 | if ( TestBit(kPtRange) && ( pt < fPtMin || pt > fPtMax )) return kFALSE; | |
146 | if ( TestBit(kPhiRange) && ( phi < fPhiMin || phi > fPhiMax )) return kFALSE; | |
147 | if ( TestBit(kYRange) && ( y < fYMin || y > fYMax )) return kFALSE; | |
148 | ||
7816887f | 149 | return kTRUE; |
150 | } | |
151 | ||
152 | ////////////////////////////////////////////////////////////////////////////////// | |
153 | ||
7e4131fc | 154 | Bool_t AliGenGeVSim::CheckAcceptance(Float_t p[3]) { |
4966b266 | 155 | // |
156 | // private function used by Generate() | |
157 | // | |
7e4131fc | 158 | // Check bounds of a total momentum and theta of a track |
4966b266 | 159 | // |
7816887f | 160 | |
7e4131fc | 161 | if ( TestBit(kThetaRange) ) { |
162 | ||
163 | Double_t theta = TMath::ATan2( TMath::Sqrt(p[0]*p[0]+p[1]*p[1]), p[2]); | |
164 | if ( theta < fThetaMin || theta > fThetaMax ) return kFALSE; | |
165 | } | |
166 | ||
7816887f | 167 | |
7e4131fc | 168 | if ( TestBit(kMomentumRange) ) { |
169 | ||
170 | Double_t momentum = TMath::Sqrt(p[0]*p[0] + p[1]*p[1] + p[2]*p[2]); | |
171 | if ( momentum < fPMin || momentum > fPMax) return kFALSE; | |
172 | } | |
7816887f | 173 | |
174 | return kTRUE; | |
175 | } | |
176 | ||
177 | ////////////////////////////////////////////////////////////////////////////////// | |
178 | ||
179 | void AliGenGeVSim::InitFormula() { | |
4966b266 | 180 | // |
181 | // private function | |
182 | // | |
183 | // Initalizes formulas used in GeVSim. | |
184 | // Manages strings and creates TFormula objects from strings | |
185 | // | |
7816887f | 186 | |
187 | // Deconvoluted Pt Y formula | |
188 | ||
189 | // ptForm: pt -> x , mass -> [0] , temperature -> [1] | |
190 | // y Form: y -> x , sigmaY -> [0] | |
191 | ||
192 | const char* ptForm = " x * exp( -sqrt([0]*[0] + x*x) / [1] )"; | |
193 | const char* yForm = " exp ( - x*x / (2 * [0]*[0] ) )"; | |
194 | ||
195 | fPtFormula = new TF1("gevsimPt", ptForm, 0, 3); | |
196 | fYFormula = new TF1("gevsimRapidity", yForm, -3, 3); | |
197 | ||
7e4131fc | 198 | fPtFormula->SetParNames("mass", "temperature"); |
7816887f | 199 | fPtFormula->SetParameters(1., 1.); |
200 | ||
7e4131fc | 201 | fYFormula->SetParName(0, "sigmaY"); |
7816887f | 202 | fYFormula->SetParameter(0, 1.); |
203 | ||
204 | // Grid for Pt and Y | |
205 | fPtFormula->SetNpx(100); | |
206 | fYFormula->SetNpx(100); | |
207 | ||
208 | ||
209 | // Models 1-3 | |
210 | ||
211 | // pt -> x , Y -> y | |
212 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
213 | ||
214 | ||
215 | const char *formE = " ( sqrt([0]*[0] + x*x) * cosh(y) ) "; | |
216 | const char *formG = " ( 1 / sqrt( 1 - [2]*[2] ) ) "; | |
4966b266 | 217 | const char *formYp = "( [2]*sqrt(([0]*[0]+x*x)*cosh(y)*cosh(y)-[0]*[0])/([1]*sqrt(1-[2]*[2]))) "; |
7816887f | 218 | |
219 | const char* formula[3] = { | |
220 | " x * %s * exp( -%s / [1]) ", | |
221 | " (x * %s) / ( exp( %s / [1]) - 1 ) ", | |
4966b266 | 222 | " x*%s*exp(-%s*%s/[1])*((sinh(%s)/%s)+([1]/(%s*%s))*(sinh(%s)/%s-cosh(%s)))" |
7816887f | 223 | }; |
224 | ||
7e4131fc | 225 | const char* paramNames[3] = {"mass", "temperature", "expVel"}; |
7816887f | 226 | |
227 | char buffer[1024]; | |
228 | ||
229 | sprintf(buffer, formula[0], formE, formE); | |
7e4131fc | 230 | fPtYFormula[0] = new TF2("gevsimPtY_2", buffer, 0, 3, -2, 2); |
7816887f | 231 | |
232 | sprintf(buffer, formula[1], formE, formE); | |
7e4131fc | 233 | fPtYFormula[1] = new TF2("gevsimPtY_3", buffer, 0, 3, -2, 2); |
7816887f | 234 | |
235 | sprintf(buffer, formula[2], formE, formG, formE, formYp, formYp, formG, formE, formYp, formYp, formYp); | |
7e4131fc | 236 | fPtYFormula[2] = new TF2("gevsimPtY_4", buffer, 0, 3, -2, 2); |
7816887f | 237 | |
238 | fPtYFormula[3] = 0; | |
239 | ||
240 | ||
241 | // setting names & initialisation | |
242 | ||
243 | Int_t i, j; | |
244 | for (i=0; i<3; i++) { | |
245 | ||
7e4131fc | 246 | fPtYFormula[i]->SetNpx(100); // step 30 MeV |
247 | fPtYFormula[i]->SetNpy(100); // | |
7816887f | 248 | |
249 | for (j=0; j<3; j++) { | |
250 | ||
251 | if ( i != 2 && j == 2 ) continue; // ExpVel | |
252 | fPtYFormula[i]->SetParName(j, paramNames[j]); | |
253 | fPtYFormula[i]->SetParameter(j, 0.5); | |
254 | } | |
255 | } | |
256 | ||
257 | // Phi Flow Formula | |
258 | ||
259 | // phi -> x | |
260 | // Psi -> [0] , Direct Flow -> [1] , Ellipticla Flow -> [2] | |
261 | ||
262 | const char* phiForm = " 1 + 2*[1]*cos(x-[0]) + 2*[2]*cos(2*(x-[0])) "; | |
263 | fPhiFormula = new TF1("gevsimPhi", phiForm, 0, 2*TMath::Pi()); | |
264 | ||
7e4131fc | 265 | fPhiFormula->SetParNames("psi", "directed", "elliptic"); |
266 | fPhiFormula->SetParameters(0., 0., 0.); | |
7816887f | 267 | |
7e4131fc | 268 | fPhiFormula->SetNpx(180); |
7816887f | 269 | |
270 | } | |
271 | ||
272 | ////////////////////////////////////////////////////////////////////////////////// | |
273 | ||
274 | void AliGenGeVSim::AddParticleType(AliGeVSimParticle *part) { | |
4966b266 | 275 | // |
276 | // Adds new type of particles. | |
277 | // | |
278 | // Parameters are defeined in AliGeVSimParticle object | |
279 | // This method has to be called for every particle type | |
280 | // | |
7816887f | 281 | |
282 | if (fPartTypes == NULL) | |
283 | fPartTypes = new TObjArray(); | |
284 | ||
285 | fPartTypes->Add(part); | |
7e4131fc | 286 | } |
287 | ||
288 | ////////////////////////////////////////////////////////////////////////////////// | |
7816887f | 289 | |
7e4131fc | 290 | void AliGenGeVSim::SetMultTotal(Bool_t isTotal) { |
291 | // | |
292 | // | |
293 | // | |
294 | ||
295 | fIsMultTotal = isTotal; | |
7816887f | 296 | } |
297 | ||
298 | ////////////////////////////////////////////////////////////////////////////////// | |
299 | ||
300 | Float_t AliGenGeVSim::FindScaler(Int_t paramId, Int_t pdg) { | |
4966b266 | 301 | // |
302 | // private function | |
303 | // Finds Scallar for a given parameter. | |
304 | // Function used in event-by-event mode. | |
305 | // | |
306 | // There are two types of scallars: deterministic and random | |
307 | // and they can work on either global or particle type level. | |
308 | // For every variable there are four scallars defined. | |
309 | // | |
310 | // Scallars are named as folowa | |
311 | // deterministic global level : "gevsimParam" (eg. "gevsimTemp") | |
312 | // deterinistig type level : "gevsimPdgParam" (eg. "gevsim211Mult") | |
313 | // random global level : "gevsimParamRndm" (eg. "gevsimMultRndm") | |
314 | // random type level : "gevsimPdgParamRndm" (eg. "gevsim-211V2Rndm"); | |
315 | // | |
316 | // Pdg - code of a particle type in PDG standard (see: http://pdg.lbl.gov) | |
317 | // Param - parameter name. Allowed parameters: | |
318 | // | |
319 | // "Temp" - inverse slope parameter | |
320 | // "SigmaY" - rapidity width - for model (1) only | |
321 | // "ExpVel" - expansion velocity - for model (4) only | |
322 | // "V1" - directed flow | |
323 | // "V2" - elliptic flow | |
324 | // "Mult" - multiplicity | |
325 | // | |
326 | ||
327 | ||
7816887f | 328 | static const char* params[] = {"Temp", "SigmaY", "ExpVel", "V1", "V2", "Mult"}; |
329 | static const char* ending[] = {"", "Rndm"}; | |
330 | ||
331 | static const char* patt1 = "gevsim%s%s"; | |
332 | static const char* patt2 = "gevsim%d%s%s"; | |
333 | ||
334 | char buffer[80]; | |
335 | TF1 *form; | |
336 | ||
337 | Float_t scaler = 1.; | |
338 | ||
339 | // Scaler evoluation: i - global/local, j - determ/random | |
340 | ||
341 | Int_t i, j; | |
342 | ||
343 | for (i=0; i<2; i++) { | |
344 | for (j=0; j<2; j++) { | |
345 | ||
346 | form = 0; | |
347 | ||
348 | if (i == 0) sprintf(buffer, patt1, params[paramId], ending[j]); | |
349 | else sprintf(buffer, patt2, pdg, params[paramId], ending[j]); | |
350 | ||
351 | form = (TF1 *)gROOT->GetFunction(buffer); | |
352 | ||
353 | if (form != 0) { | |
354 | if (j == 0) scaler *= form->Eval(gAlice->GetEvNumber()); | |
355 | if (j == 1) { | |
356 | form->SetParameter(0, gAlice->GetEvNumber()); | |
357 | scaler *= form->GetRandom(); | |
358 | } | |
359 | } | |
360 | } | |
361 | } | |
362 | ||
363 | return scaler; | |
364 | } | |
365 | ||
366 | ////////////////////////////////////////////////////////////////////////////////// | |
367 | ||
4966b266 | 368 | void AliGenGeVSim::DetermineReactionPlane() { |
369 | // | |
370 | // private function used by Generate() | |
371 | // | |
372 | // Retermines Reaction Plane angle and set this value | |
373 | // as a parameter [0] in fPhiFormula | |
374 | // | |
375 | // Note: if "gevsimPsiRndm" function is found it override both | |
376 | // "gevsimPhi" function and initial fPsi value | |
377 | // | |
378 | ||
379 | TF1 *form; | |
380 | ||
381 | form = 0; | |
382 | form = (TF1 *)gROOT->GetFunction("gevsimPsi"); | |
7e4131fc | 383 | if (form) fPsi = form->Eval(gAlice->GetEvNumber()); |
4966b266 | 384 | |
7e4131fc | 385 | form = 0; |
4966b266 | 386 | form = (TF1 *)gROOT->GetFunction("gevsimPsiRndm"); |
7e4131fc | 387 | if (form) fPsi = form->GetRandom(); |
4966b266 | 388 | |
389 | fPhiFormula->SetParameter(0, fPsi); | |
390 | } | |
391 | ||
392 | ////////////////////////////////////////////////////////////////////////////////// | |
393 | ||
7e4131fc | 394 | Float_t AliGenGeVSim::GetdNdYToTotal() { |
4966b266 | 395 | // |
7e4131fc | 396 | // Private, helper function used by Generate() |
4966b266 | 397 | // |
7e4131fc | 398 | // Returns total multiplicity to dN/dY ration using current distribution. |
399 | // The function have to be called after setting distribution and its | |
400 | // parameters (like temperature). | |
401 | // | |
402 | ||
403 | Float_t integ, mag; | |
404 | const Double_t maxPt = 3.0, maxY = 2.; | |
405 | ||
406 | if (fModel == 1) { | |
407 | ||
408 | integ = fYFormula->Integral(-maxY, maxY); | |
409 | mag = fYFormula->Eval(0); | |
410 | return integ/mag; | |
411 | } | |
412 | ||
413 | // 2D formula standard or custom | |
414 | ||
415 | if (fModel > 1 && fModel < 6) { | |
416 | ||
417 | integ = ((TF2*)fCurrentForm)->Integral(0,maxPt, -maxY, maxY); | |
418 | mag = ((TF2*)fCurrentForm)->Integral(0, maxPt, -0.1, 0.1) / 0.2; | |
419 | return integ/mag; | |
420 | } | |
421 | ||
422 | // 2 1D histograms | |
423 | ||
424 | if (fModel == 6) { | |
425 | ||
426 | integ = fHist[1]->Integral(); | |
427 | mag = fHist[0]->GetBinContent(fHist[0]->FindBin(0.)); | |
428 | mag /= fHist[0]->GetBinWidth(fHist[0]->FindBin(0.)); | |
429 | return integ/mag; | |
430 | } | |
431 | ||
432 | // 2D histogram | |
4966b266 | 433 | |
7e4131fc | 434 | if (fModel == 7) { |
435 | ||
436 | // Not tested ... | |
437 | Int_t yBins = fPtYHist->GetNbinsY(); | |
438 | Int_t ptBins = fPtYHist->GetNbinsX(); | |
439 | ||
440 | integ = fPtYHist->Integral(0, ptBins, 0, yBins); | |
441 | mag = fPtYHist->Integral(0, ptBins, (yBins/2)-1, (yBins/2)+1 ) / 2; | |
442 | return integ/mag; | |
443 | } | |
444 | ||
445 | return 1; | |
4966b266 | 446 | } |
447 | ||
448 | ////////////////////////////////////////////////////////////////////////////////// | |
449 | ||
7e4131fc | 450 | void AliGenGeVSim::SetFormula(Int_t pdg) { |
4966b266 | 451 | // |
7e4131fc | 452 | // Private function used by Generate() |
4966b266 | 453 | // |
7e4131fc | 454 | // Configure a formula for a given particle type and model Id (in fModel). |
455 | // If custom formula or histogram was selected the function tries | |
456 | // to find it. | |
457 | // | |
458 | // The function implements naming conventions for custom distributions names | |
459 | // | |
7816887f | 460 | |
7e4131fc | 461 | char buff[40]; |
462 | const char* msg[4] = { | |
463 | "Custom Formula for Pt Y distribution not found [pdg = %d]", | |
464 | "Histogram for Pt distribution not found [pdg = %d]", | |
465 | "Histogram for Y distribution not found [pdg = %d]", | |
466 | "HIstogram for Pt Y dostribution not found [pdg = %d]" | |
467 | }; | |
468 | ||
469 | const char* pattern[8] = { | |
470 | "gevsimDistPtY", "gevsimDist%dPtY", | |
471 | "gevsimHistPt", "gevsimHist%dPt", | |
472 | "gevsimHistY", "gevsimHist%dY", | |
473 | "gevsimHistPtY", "gevsimHist%dPtY" | |
474 | }; | |
475 | ||
476 | const char *where = "SetFormula"; | |
7816887f | 477 | |
7816887f | 478 | |
7e4131fc | 479 | if (fModel < 1 || fModel > 7) |
480 | Error("SetFormula", "Model Id (%d) out of range [1-7]", fModel); | |
481 | ||
482 | ||
483 | // standard models | |
484 | ||
485 | if (fModel == 1) fCurrentForm = fPtFormula; | |
486 | if (fModel > 1 && fModel < 5) fCurrentForm = fPtYFormula[fModel-2]; | |
487 | ||
488 | ||
489 | // custom model defined by a formula | |
490 | ||
7816887f | 491 | if (fModel == 5) { |
492 | ||
7e4131fc | 493 | fCurrentForm = 0; |
494 | fCurrentForm = (TF2*)gROOT->GetFunction(pattern[0]); | |
495 | ||
496 | if (!fCurrentForm) { | |
497 | ||
498 | sprintf(buff, pattern[1], pdg); | |
499 | fCurrentForm = (TF2*)gROOT->GetFunction(buff); | |
500 | ||
501 | if (!fCurrentForm) Error(where, msg[0], pdg); | |
502 | } | |
503 | } | |
504 | ||
505 | // 2 1D histograms | |
506 | ||
507 | if (fModel == 6) { | |
7816887f | 508 | |
7e4131fc | 509 | for (Int_t i=0; i<2; i++) { |
7816887f | 510 | |
7e4131fc | 511 | fHist[i] = 0; |
512 | fHist[i] = (TH1D*)gROOT->FindObject(pattern[2+2*i]); | |
513 | ||
514 | if (!fHist[i]) { | |
515 | ||
516 | sprintf(buff, pattern[3+2*i], pdg); | |
517 | fHist[i] = (TH1D*)gROOT->FindObject(buff); | |
518 | ||
519 | if (!fHist[i]) Error(where, msg[1+i], pdg); | |
520 | } | |
521 | } | |
7816887f | 522 | } |
7e4131fc | 523 | |
524 | // 2d histogram | |
525 | ||
526 | if (fModel == 7) { | |
527 | ||
528 | fPtYHist = 0; | |
529 | fPtYHist = (TH2D*)gROOT->FindObject(pattern[6]); | |
530 | ||
531 | if (!fPtYHist) { | |
532 | ||
533 | sprintf(buff, pattern[7], pdg); | |
534 | fPtYHist = (TH2D*)gROOT->FindObject(buff); | |
535 | } | |
536 | ||
537 | if (!fPtYHist) Error(where, msg[4], pdg); | |
538 | } | |
539 | ||
540 | } | |
541 | ||
542 | ////////////////////////////////////////////////////////////////////////////////// | |
543 | ||
544 | void AliGenGeVSim:: AdjustFormula() { | |
545 | // | |
546 | // Private Function | |
547 | // Adjust fomula bounds according to acceptance cuts. | |
548 | // | |
549 | // Since GeVSim is producing "thermal" particles Pt | |
550 | // is cut at 3 GeV even when acceptance extends to grater momenta. | |
551 | // | |
552 | // WARNING ! | |
553 | // If custom formula was provided function preserves | |
554 | // original cuts. | |
555 | // | |
556 | ||
557 | const Double_t kMaxPt = 3.0; | |
558 | const Double_t kMaxY = 2.0; | |
559 | Double_t minPt, maxPt, minY, maxY; | |
560 | ||
561 | ||
562 | if (fModel > 4) return; | |
563 | ||
564 | // max Pt | |
565 | if (TestBit(kPtRange) && fPtMax < kMaxPt ) maxPt = fPtMax; | |
566 | else maxPt = kMaxPt; | |
567 | ||
568 | // min Pt | |
569 | if (TestBit(kPtRange)) minPt = fPtMin; | |
570 | else minPt = 0; | |
571 | ||
572 | if (TestBit(kPtRange) && fPtMin > kMaxPt ) | |
573 | Warning("Acceptance", "Minimum Pt (%3.2f GeV) greater that 3.0 GeV ", fPtMin); | |
574 | ||
575 | // Max Pt < Max P | |
576 | if (TestBit(kMomentumRange) && fPtMax < maxPt) maxPt = fPtMax; | |
577 | ||
578 | // max and min rapidity | |
579 | if (TestBit(kYRange)) { | |
580 | minY = fYMin; | |
581 | maxY = fYMax; | |
582 | } else { | |
583 | minY = -kMaxY; | |
584 | maxY = kMaxY; | |
585 | } | |
586 | ||
587 | // adjust formula | |
588 | ||
589 | if (fModel == 1) { | |
590 | fPtFormula->SetRange(fPtMin, maxPt); | |
591 | fYFormula->SetRange(fYMin, fYMax); | |
592 | } | |
593 | ||
594 | if (fModel > 1) | |
595 | ((TF2*)fCurrentForm)->SetRange(minPt, minY, maxPt, maxY); | |
596 | ||
597 | // azimuthal cut | |
598 | ||
599 | if (TestBit(kPhiRange)) | |
600 | fPhiFormula->SetRange(fPhiMin, fPhiMax); | |
601 | ||
602 | } | |
603 | ||
604 | ////////////////////////////////////////////////////////////////////////////////// | |
605 | ||
606 | void AliGenGeVSim::GetRandomPtY(Double_t &pt, Double_t &y) { | |
607 | // | |
608 | // Private function used by Generate() | |
609 | // | |
610 | // Returns random values of Pt and Y corresponding to selected | |
611 | // distribution. | |
612 | // | |
613 | ||
614 | if (fModel == 1) { | |
615 | pt = fPtFormula->GetRandom(); | |
616 | y = fYFormula->GetRandom(); | |
617 | return; | |
618 | } | |
619 | ||
620 | if (fModel > 1 && fModel < 6) { | |
621 | ((TF2*)fCurrentForm)->GetRandom2(pt, y); | |
622 | return; | |
623 | } | |
624 | ||
625 | if (fModel == 6) { | |
626 | pt = fHist[0]->GetRandom(); | |
627 | y = fHist[1]->GetRandom(); | |
628 | } | |
629 | ||
630 | if (fModel == 7) { | |
631 | fPtYHist->GetRandom2(pt, y); | |
632 | return; | |
633 | } | |
634 | } | |
635 | ||
636 | ////////////////////////////////////////////////////////////////////////////////// | |
637 | ||
638 | void AliGenGeVSim::Init() { | |
639 | // | |
640 | // Standard AliGenerator initializer. | |
641 | // does nothing | |
642 | // | |
7816887f | 643 | } |
644 | ||
645 | ////////////////////////////////////////////////////////////////////////////////// | |
646 | ||
647 | void AliGenGeVSim::Generate() { | |
4966b266 | 648 | // |
649 | // Standard AliGenerator function | |
650 | // This function do actual job and puts particles on stack. | |
651 | // | |
7816887f | 652 | |
7816887f | 653 | PDG_t pdg; // particle type |
654 | Float_t mass; // particle mass | |
655 | Float_t orgin[3] = {0,0,0}; // particle orgin [cm] | |
656 | Float_t polar[3] = {0,0,0}; // polarisation | |
7816887f | 657 | Float_t time = 0; // time of creation |
7816887f | 658 | |
7e4131fc | 659 | Float_t multiplicity = 0; |
660 | Bool_t isMultTotal = kTRUE; | |
661 | ||
7816887f | 662 | Float_t paramScaler; |
7e4131fc | 663 | Float_t directedScaller = 1., ellipticScaller = 1.; |
664 | ||
665 | TLorentzVector *v = new TLorentzVector(0,0,0,0); | |
7816887f | 666 | |
4966b266 | 667 | const Int_t kParent = -1; |
7816887f | 668 | Int_t id; |
669 | ||
7816887f | 670 | // vertexing |
7816887f | 671 | VertexInternal(); |
7816887f | 672 | orgin[0] = fVertex[0]; |
673 | orgin[1] = fVertex[1]; | |
674 | orgin[2] = fVertex[2]; | |
675 | ||
7816887f | 676 | |
677 | // Particle params database | |
678 | ||
679 | TDatabasePDG *db = TDatabasePDG::Instance(); | |
680 | TParticlePDG *type; | |
681 | AliGeVSimParticle *partType; | |
682 | ||
683 | Int_t nType, nParticle, nParam; | |
7e4131fc | 684 | const Int_t nParams = 6; |
7816887f | 685 | |
4966b266 | 686 | // reaction plane determination and model |
4966b266 | 687 | DetermineReactionPlane(); |
7e4131fc | 688 | |
7816887f | 689 | // loop over particle types |
690 | ||
691 | for (nType = 0; nType < fPartTypes->GetEntries(); nType++) { | |
692 | ||
693 | partType = (AliGeVSimParticle *)fPartTypes->At(nType); | |
694 | ||
695 | pdg = (PDG_t)partType->GetPdgCode(); | |
696 | type = db->GetParticle(pdg); | |
697 | mass = type->Mass(); | |
698 | ||
7e4131fc | 699 | fModel = partType->GetModel(); |
700 | SetFormula(pdg); | |
701 | fCurrentForm->SetParameter("mass", mass); | |
7816887f | 702 | |
7816887f | 703 | |
704 | // Evaluation of parameters - loop over parameters | |
705 | ||
7e4131fc | 706 | for (nParam = 0; nParam < nParams; nParam++) { |
7816887f | 707 | |
708 | paramScaler = FindScaler(nParam, pdg); | |
709 | ||
7e4131fc | 710 | if (nParam == 0) |
711 | fCurrentForm->SetParameter("temperature", paramScaler * partType->GetTemperature()); | |
7816887f | 712 | |
713 | if (nParam == 1 && fModel == 1) | |
7e4131fc | 714 | fYFormula->SetParameter("sigmaY", paramScaler * partType->GetSigmaY()); |
7816887f | 715 | |
716 | if (nParam == 2 && fModel == 4) { | |
717 | ||
7e4131fc | 718 | Double_t totalExpVal = paramScaler * partType->GetExpansionVelocity(); |
7816887f | 719 | |
720 | if (totalExpVal == 0.0) totalExpVal = 0.0001; | |
721 | if (totalExpVal == 1.0) totalExpVal = 9.9999; | |
722 | ||
7e4131fc | 723 | fCurrentForm->SetParameter("expVel", totalExpVal); |
7816887f | 724 | } |
725 | ||
726 | // flow | |
7e4131fc | 727 | |
728 | if (nParam == 3) directedScaller = paramScaler; | |
729 | if (nParam == 4) ellipticScaller = paramScaler; | |
7816887f | 730 | |
731 | // multiplicity | |
7e4131fc | 732 | |
733 | if (nParam == 5) { | |
734 | ||
735 | if (partType->IsMultForced()) isMultTotal = partType->IsMultTotal(); | |
736 | else isMultTotal = fIsMultTotal; | |
7816887f | 737 | |
7e4131fc | 738 | multiplicity = paramScaler * partType->GetMultiplicity(); |
739 | multiplicity *= (isMultTotal)? 1 : GetdNdYToTotal(); | |
740 | } | |
7816887f | 741 | } |
742 | ||
7e4131fc | 743 | // Flow defined on the particle type level (not parameterised) |
744 | if (partType->IsFlowSimple()) { | |
745 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(0,0) * directedScaller); | |
746 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(0,0) * ellipticScaller); | |
747 | } | |
748 | ||
749 | AdjustFormula(); | |
750 | ||
751 | ||
752 | Info("Generate","PDG = %d \t Mult = %d", pdg, (Int_t)multiplicity); | |
7816887f | 753 | |
754 | // loop over particles | |
755 | ||
756 | nParticle = 0; | |
7816887f | 757 | while (nParticle < multiplicity) { |
758 | ||
7e4131fc | 759 | Double_t pt, y, phi; // momentum in [pt,y,phi] |
760 | Float_t p[3] = {0,0,0}; // particle momentum | |
7816887f | 761 | |
7e4131fc | 762 | GetRandomPtY(pt, y); |
7816887f | 763 | |
7e4131fc | 764 | // phi distribution configuration when differential flow defined |
765 | // to be optimised in future release | |
7816887f | 766 | |
7e4131fc | 767 | if (!partType->IsFlowSimple()) { |
768 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(pt,y) * directedScaller); | |
769 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(pt,y) * ellipticScaller); | |
770 | } | |
7816887f | 771 | |
7e4131fc | 772 | phi = fPhiFormula->GetRandom(); |
7816887f | 773 | |
7e4131fc | 774 | if (!isMultTotal) nParticle++; |
775 | if (fModel > 4 && !CheckPtYPhi(pt,y,phi) ) continue; | |
776 | ||
7816887f | 777 | // coordinate transformation |
7816887f | 778 | v->SetPtEtaPhiM(pt, y, phi, mass); |
779 | ||
780 | p[0] = v->Px(); | |
781 | p[1] = v->Py(); | |
782 | p[2] = v->Pz(); | |
783 | ||
784 | // momentum range test | |
7e4131fc | 785 | if ( !CheckAcceptance(p) ) continue; |
7816887f | 786 | |
787 | // putting particle on the stack | |
788 | ||
7e4131fc | 789 | SetTrack(fTrackIt, kParent, pdg, p, orgin, polar, time, kPPrimary, id, fTrackIt); |
790 | if (isMultTotal) nParticle++; | |
7816887f | 791 | } |
792 | } | |
7e4131fc | 793 | |
794 | delete v; | |
7816887f | 795 | } |
796 | ||
797 | ////////////////////////////////////////////////////////////////////////////////// |