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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 | /* $Id$ */ | |
4966b266 | 17 | // |
7e4131fc | 18 | // AliGenGeVSim is a class implementing GeVSim event generator. |
19 | // | |
20 | // GeVSim is a simple Monte-Carlo event generator for testing detector and | |
21 | // algorythm performance especialy concerning flow and event-by-event studies | |
4966b266 | 22 | // |
23 | // In this event generator particles are generated from thermal distributions | |
24 | // without any dynamics and addicional constrains. Distribution parameters like | |
25 | // multiplicity, particle type yields, inverse slope parameters, flow coeficients | |
26 | // and expansion velocities are expleicite defined by the user. | |
27 | // | |
28 | // GeVSim contains four thermal distributions the same as | |
29 | // MevSim event generator developed for STAR experiment. | |
30 | // | |
7e4131fc | 31 | // In addition custom distributions can be used be the mean |
32 | // either two dimensional formula (TF2), a two dimensional histogram or | |
33 | // two one dimensional histograms. | |
4966b266 | 34 | // |
35 | // Azimuthal distribution is deconvoluted from (Pt,Y) distribution | |
36 | // and is described by two Fourier coefficients representing | |
7e4131fc | 37 | // Directed and Elliptic flow. |
4966b266 | 38 | // |
7e4131fc | 39 | //////////////////////////////////////////////////////////////////////////////// |
40 | // | |
4966b266 | 41 | // To apply flow to event ganerated by an arbitraly event generator |
42 | // refer to AliGenAfterBurnerFlow class. | |
43 | // | |
7e4131fc | 44 | //////////////////////////////////////////////////////////////////////////////// |
45 | // | |
4966b266 | 46 | // For examples, parameters and testing macros refer to: |
47 | // http:/home.cern.ch/radomski | |
7e4131fc | 48 | // |
49 | // for more detailed description refer to ALICE NOTE | |
50 | // "GeVSim Monte-Carlo Event Generator" | |
51 | // S.Radosmki, P. Foka. | |
4966b266 | 52 | // |
53 | // Author: | |
54 | // Sylwester Radomski, | |
55 | // GSI, March 2002 | |
56 | // | |
57 | // S.Radomski@gsi.de | |
58 | // | |
59 | //////////////////////////////////////////////////////////////////////////////// | |
7e4131fc | 60 | // |
61 | // Updated and revised: September 2002, S. Radomski, GSI | |
62 | // | |
63 | //////////////////////////////////////////////////////////////////////////////// | |
64 | ||
7816887f | 65 | |
116cbefd | 66 | #include <Riostream.h> |
67 | #include <TCanvas.h> | |
68 | #include <TF1.h> | |
69 | #include <TF2.h> | |
70 | #include <TH1.h> | |
71 | #include <TH2.h> | |
72 | #include <TObjArray.h> | |
73 | #include <TPDGCode.h> | |
74 | #include <TParticle.h> | |
75 | #include <TROOT.h> | |
7816887f | 76 | |
4966b266 | 77 | |
4966b266 | 78 | #include "AliGeVSimParticle.h" |
116cbefd | 79 | #include "AliGenGeVSim.h" |
daa61231 | 80 | #include "AliGenGeVSimEventHeader.h" |
116cbefd | 81 | #include "AliGenerator.h" |
82 | #include "AliRun.h" | |
4966b266 | 83 | |
7816887f | 84 | |
85 | ClassImp(AliGenGeVSim); | |
86 | ||
87 | ////////////////////////////////////////////////////////////////////////////////// | |
88 | ||
89 | AliGenGeVSim::AliGenGeVSim() : AliGenerator(-1) { | |
4966b266 | 90 | // |
91 | // Default constructor | |
92 | // | |
7816887f | 93 | |
7816887f | 94 | fPsi = 0; |
7e4131fc | 95 | fIsMultTotal = kTRUE; |
7816887f | 96 | |
97 | //PH InitFormula(); | |
7e4131fc | 98 | for (Int_t i=0; i<4; i++) |
7816887f | 99 | fPtYFormula[i] = 0; |
0a78fc4d | 100 | fPartTypes = 0; |
7816887f | 101 | } |
102 | ||
103 | ////////////////////////////////////////////////////////////////////////////////// | |
104 | ||
7e4131fc | 105 | AliGenGeVSim::AliGenGeVSim(Float_t psi, Bool_t isMultTotal) : AliGenerator(-1) { |
4966b266 | 106 | // |
107 | // Standard Constructor. | |
108 | // | |
7e4131fc | 109 | // models - thermal model to be used: |
4966b266 | 110 | // 1 - deconvoluted pt and Y source |
111 | // 2,3 - thermalized sphericaly symetric sources | |
112 | // 4 - thermalized source with expansion | |
113 | // 5 - custom model defined in TF2 object named "gevsimPtY" | |
7e4131fc | 114 | // 6 - custom model defined by two 1D histograms |
115 | // 7 - custom model defined by 2D histogram | |
4966b266 | 116 | // |
7e4131fc | 117 | // psi - reaction plane in degrees |
118 | // isMultTotal - multiplicity mode | |
119 | // kTRUE - total multiplicity (default) | |
120 | // kFALSE - dN/dY at midrapidity | |
121 | // | |
7816887f | 122 | |
123 | // checking consistancy | |
7e4131fc | 124 | |
4966b266 | 125 | if (psi < 0 || psi > 360 ) |
126 | Error ("AliGenGeVSim", "Reaction plane angle ( %d )out of range [0..360]", psi); | |
7816887f | 127 | |
daa61231 | 128 | fPsi = psi * TMath::Pi() / 180. ; |
7e4131fc | 129 | fIsMultTotal = isMultTotal; |
7816887f | 130 | |
131 | // initialization | |
132 | ||
133 | fPartTypes = new TObjArray(); | |
134 | InitFormula(); | |
7816887f | 135 | } |
136 | ||
137 | ////////////////////////////////////////////////////////////////////////////////// | |
138 | ||
139 | AliGenGeVSim::~AliGenGeVSim() { | |
4966b266 | 140 | // |
141 | // Default Destructor | |
142 | // | |
143 | // Removes TObjArray keeping list of registered particle types | |
144 | // | |
7816887f | 145 | |
146 | if (fPartTypes != NULL) delete fPartTypes; | |
147 | } | |
148 | ||
149 | ||
150 | ////////////////////////////////////////////////////////////////////////////////// | |
151 | ||
0af12c00 | 152 | Bool_t AliGenGeVSim::CheckPtYPhi(Float_t pt, Float_t y, Float_t phi) const { |
4966b266 | 153 | // |
154 | // private function used by Generate() | |
155 | // | |
156 | // Check bounds of Pt, Rapidity and Azimuthal Angle of a track | |
7e4131fc | 157 | // Used only when generating particles from a histogram |
4966b266 | 158 | // |
7816887f | 159 | |
160 | if ( TestBit(kPtRange) && ( pt < fPtMin || pt > fPtMax )) return kFALSE; | |
161 | if ( TestBit(kPhiRange) && ( phi < fPhiMin || phi > fPhiMax )) return kFALSE; | |
162 | if ( TestBit(kYRange) && ( y < fYMin || y > fYMax )) return kFALSE; | |
163 | ||
7816887f | 164 | return kTRUE; |
165 | } | |
166 | ||
167 | ////////////////////////////////////////////////////////////////////////////////// | |
168 | ||
7e4131fc | 169 | Bool_t AliGenGeVSim::CheckAcceptance(Float_t p[3]) { |
4966b266 | 170 | // |
171 | // private function used by Generate() | |
172 | // | |
7e4131fc | 173 | // Check bounds of a total momentum and theta of a track |
4966b266 | 174 | // |
7816887f | 175 | |
7e4131fc | 176 | if ( TestBit(kThetaRange) ) { |
177 | ||
178 | Double_t theta = TMath::ATan2( TMath::Sqrt(p[0]*p[0]+p[1]*p[1]), p[2]); | |
179 | if ( theta < fThetaMin || theta > fThetaMax ) return kFALSE; | |
180 | } | |
181 | ||
7816887f | 182 | |
7e4131fc | 183 | if ( TestBit(kMomentumRange) ) { |
184 | ||
185 | Double_t momentum = TMath::Sqrt(p[0]*p[0] + p[1]*p[1] + p[2]*p[2]); | |
186 | if ( momentum < fPMin || momentum > fPMax) return kFALSE; | |
187 | } | |
7816887f | 188 | |
189 | return kTRUE; | |
190 | } | |
191 | ||
192 | ////////////////////////////////////////////////////////////////////////////////// | |
193 | ||
194 | void AliGenGeVSim::InitFormula() { | |
4966b266 | 195 | // |
196 | // private function | |
197 | // | |
198 | // Initalizes formulas used in GeVSim. | |
199 | // Manages strings and creates TFormula objects from strings | |
200 | // | |
7816887f | 201 | |
202 | // Deconvoluted Pt Y formula | |
203 | ||
204 | // ptForm: pt -> x , mass -> [0] , temperature -> [1] | |
205 | // y Form: y -> x , sigmaY -> [0] | |
206 | ||
49039a84 | 207 | const char* kPtForm = " x * exp( -sqrt([0]*[0] + x*x) / [1] )"; |
208 | const char* kYForm = " exp ( - x*x / (2 * [0]*[0] ) )"; | |
7816887f | 209 | |
49039a84 | 210 | fPtFormula = new TF1("gevsimPt", kPtForm, 0, 3); |
211 | fYFormula = new TF1("gevsimRapidity", kYForm, -3, 3); | |
7816887f | 212 | |
7e4131fc | 213 | fPtFormula->SetParNames("mass", "temperature"); |
7816887f | 214 | fPtFormula->SetParameters(1., 1.); |
215 | ||
7e4131fc | 216 | fYFormula->SetParName(0, "sigmaY"); |
7816887f | 217 | fYFormula->SetParameter(0, 1.); |
218 | ||
219 | // Grid for Pt and Y | |
220 | fPtFormula->SetNpx(100); | |
221 | fYFormula->SetNpx(100); | |
222 | ||
223 | ||
224 | // Models 1-3 | |
225 | ||
226 | // pt -> x , Y -> y | |
227 | // mass -> [0] , temperature -> [1] , expansion velocity -> [2] | |
228 | ||
229 | ||
49039a84 | 230 | const char *kFormE = " ( sqrt([0]*[0] + x*x) * cosh(y) ) "; |
231 | const char *kFormG = " ( 1 / sqrt( 1 - [2]*[2] ) ) "; | |
232 | const char *kFormYp = "( [2]*sqrt(([0]*[0]+x*x)*cosh(y)*cosh(y)-[0]*[0])/([1]*sqrt(1-[2]*[2]))) "; | |
7816887f | 233 | |
49039a84 | 234 | const char* kFormula[3] = { |
7816887f | 235 | " x * %s * exp( -%s / [1]) ", |
236 | " (x * %s) / ( exp( %s / [1]) - 1 ) ", | |
4966b266 | 237 | " x*%s*exp(-%s*%s/[1])*((sinh(%s)/%s)+([1]/(%s*%s))*(sinh(%s)/%s-cosh(%s)))" |
7816887f | 238 | }; |
239 | ||
49039a84 | 240 | const char* kParamNames[3] = {"mass", "temperature", "expVel"}; |
7816887f | 241 | |
242 | char buffer[1024]; | |
243 | ||
49039a84 | 244 | sprintf(buffer, kFormula[0], kFormE, kFormE); |
7e4131fc | 245 | fPtYFormula[0] = new TF2("gevsimPtY_2", buffer, 0, 3, -2, 2); |
7816887f | 246 | |
49039a84 | 247 | sprintf(buffer, kFormula[1], kFormE, kFormE); |
7e4131fc | 248 | fPtYFormula[1] = new TF2("gevsimPtY_3", buffer, 0, 3, -2, 2); |
7816887f | 249 | |
49039a84 | 250 | sprintf(buffer, kFormula[2], kFormE, kFormG, kFormE, kFormYp, kFormYp, kFormG, kFormE, kFormYp, kFormYp, kFormYp); |
7e4131fc | 251 | fPtYFormula[2] = new TF2("gevsimPtY_4", buffer, 0, 3, -2, 2); |
7816887f | 252 | |
253 | fPtYFormula[3] = 0; | |
254 | ||
255 | ||
256 | // setting names & initialisation | |
257 | ||
258 | Int_t i, j; | |
259 | for (i=0; i<3; i++) { | |
260 | ||
7e4131fc | 261 | fPtYFormula[i]->SetNpx(100); // step 30 MeV |
262 | fPtYFormula[i]->SetNpy(100); // | |
7816887f | 263 | |
264 | for (j=0; j<3; j++) { | |
265 | ||
266 | if ( i != 2 && j == 2 ) continue; // ExpVel | |
49039a84 | 267 | fPtYFormula[i]->SetParName(j, kParamNames[j]); |
7816887f | 268 | fPtYFormula[i]->SetParameter(j, 0.5); |
269 | } | |
270 | } | |
271 | ||
272 | // Phi Flow Formula | |
273 | ||
274 | // phi -> x | |
275 | // Psi -> [0] , Direct Flow -> [1] , Ellipticla Flow -> [2] | |
276 | ||
49039a84 | 277 | const char* kPhiForm = " 1 + 2*[1]*cos(x-[0]) + 2*[2]*cos(2*(x-[0])) "; |
278 | fPhiFormula = new TF1("gevsimPhi", kPhiForm, 0, 2*TMath::Pi()); | |
7816887f | 279 | |
7e4131fc | 280 | fPhiFormula->SetParNames("psi", "directed", "elliptic"); |
281 | fPhiFormula->SetParameters(0., 0., 0.); | |
7816887f | 282 | |
7e4131fc | 283 | fPhiFormula->SetNpx(180); |
7816887f | 284 | |
285 | } | |
286 | ||
287 | ////////////////////////////////////////////////////////////////////////////////// | |
288 | ||
289 | void AliGenGeVSim::AddParticleType(AliGeVSimParticle *part) { | |
4966b266 | 290 | // |
291 | // Adds new type of particles. | |
292 | // | |
293 | // Parameters are defeined in AliGeVSimParticle object | |
294 | // This method has to be called for every particle type | |
295 | // | |
7816887f | 296 | |
297 | if (fPartTypes == NULL) | |
298 | fPartTypes = new TObjArray(); | |
299 | ||
300 | fPartTypes->Add(part); | |
7e4131fc | 301 | } |
302 | ||
303 | ////////////////////////////////////////////////////////////////////////////////// | |
7816887f | 304 | |
7e4131fc | 305 | void AliGenGeVSim::SetMultTotal(Bool_t isTotal) { |
306 | // | |
307 | // | |
308 | // | |
309 | ||
310 | fIsMultTotal = isTotal; | |
7816887f | 311 | } |
312 | ||
313 | ////////////////////////////////////////////////////////////////////////////////// | |
314 | ||
315 | Float_t AliGenGeVSim::FindScaler(Int_t paramId, Int_t pdg) { | |
4966b266 | 316 | // |
317 | // private function | |
318 | // Finds Scallar for a given parameter. | |
319 | // Function used in event-by-event mode. | |
320 | // | |
321 | // There are two types of scallars: deterministic and random | |
322 | // and they can work on either global or particle type level. | |
323 | // For every variable there are four scallars defined. | |
324 | // | |
325 | // Scallars are named as folowa | |
326 | // deterministic global level : "gevsimParam" (eg. "gevsimTemp") | |
327 | // deterinistig type level : "gevsimPdgParam" (eg. "gevsim211Mult") | |
328 | // random global level : "gevsimParamRndm" (eg. "gevsimMultRndm") | |
329 | // random type level : "gevsimPdgParamRndm" (eg. "gevsim-211V2Rndm"); | |
330 | // | |
331 | // Pdg - code of a particle type in PDG standard (see: http://pdg.lbl.gov) | |
332 | // Param - parameter name. Allowed parameters: | |
333 | // | |
334 | // "Temp" - inverse slope parameter | |
335 | // "SigmaY" - rapidity width - for model (1) only | |
336 | // "ExpVel" - expansion velocity - for model (4) only | |
337 | // "V1" - directed flow | |
338 | // "V2" - elliptic flow | |
339 | // "Mult" - multiplicity | |
340 | // | |
341 | ||
342 | ||
7816887f | 343 | static const char* params[] = {"Temp", "SigmaY", "ExpVel", "V1", "V2", "Mult"}; |
344 | static const char* ending[] = {"", "Rndm"}; | |
345 | ||
346 | static const char* patt1 = "gevsim%s%s"; | |
347 | static const char* patt2 = "gevsim%d%s%s"; | |
348 | ||
349 | char buffer[80]; | |
350 | TF1 *form; | |
351 | ||
352 | Float_t scaler = 1.; | |
353 | ||
354 | // Scaler evoluation: i - global/local, j - determ/random | |
355 | ||
356 | Int_t i, j; | |
357 | ||
358 | for (i=0; i<2; i++) { | |
359 | for (j=0; j<2; j++) { | |
360 | ||
361 | form = 0; | |
362 | ||
363 | if (i == 0) sprintf(buffer, patt1, params[paramId], ending[j]); | |
364 | else sprintf(buffer, patt2, pdg, params[paramId], ending[j]); | |
365 | ||
366 | form = (TF1 *)gROOT->GetFunction(buffer); | |
367 | ||
368 | if (form != 0) { | |
369 | if (j == 0) scaler *= form->Eval(gAlice->GetEvNumber()); | |
370 | if (j == 1) { | |
371 | form->SetParameter(0, gAlice->GetEvNumber()); | |
372 | scaler *= form->GetRandom(); | |
373 | } | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
378 | return scaler; | |
379 | } | |
380 | ||
381 | ////////////////////////////////////////////////////////////////////////////////// | |
382 | ||
4966b266 | 383 | void AliGenGeVSim::DetermineReactionPlane() { |
384 | // | |
385 | // private function used by Generate() | |
386 | // | |
387 | // Retermines Reaction Plane angle and set this value | |
388 | // as a parameter [0] in fPhiFormula | |
389 | // | |
390 | // Note: if "gevsimPsiRndm" function is found it override both | |
391 | // "gevsimPhi" function and initial fPsi value | |
392 | // | |
393 | ||
394 | TF1 *form; | |
395 | ||
396 | form = 0; | |
397 | form = (TF1 *)gROOT->GetFunction("gevsimPsi"); | |
daa61231 | 398 | if (form) fPsi = form->Eval(gAlice->GetEvNumber()) * TMath::Pi() / 180; |
4966b266 | 399 | |
7e4131fc | 400 | form = 0; |
4966b266 | 401 | form = (TF1 *)gROOT->GetFunction("gevsimPsiRndm"); |
daa61231 | 402 | if (form) fPsi = form->GetRandom() * TMath::Pi() / 180; |
403 | ||
404 | ||
405 | cout << "Psi = " << fPsi << "\t" << (Int_t)(fPsi*180./TMath::Pi()) << endl; | |
4966b266 | 406 | |
407 | fPhiFormula->SetParameter(0, fPsi); | |
408 | } | |
409 | ||
410 | ////////////////////////////////////////////////////////////////////////////////// | |
411 | ||
7e4131fc | 412 | Float_t AliGenGeVSim::GetdNdYToTotal() { |
4966b266 | 413 | // |
7e4131fc | 414 | // Private, helper function used by Generate() |
4966b266 | 415 | // |
7e4131fc | 416 | // Returns total multiplicity to dN/dY ration using current distribution. |
417 | // The function have to be called after setting distribution and its | |
418 | // parameters (like temperature). | |
419 | // | |
420 | ||
421 | Float_t integ, mag; | |
49039a84 | 422 | const Double_t kMaxPt = 3.0, kMaxY = 2.; |
7e4131fc | 423 | |
424 | if (fModel == 1) { | |
425 | ||
49039a84 | 426 | integ = fYFormula->Integral(-kMaxY, kMaxY); |
7e4131fc | 427 | mag = fYFormula->Eval(0); |
428 | return integ/mag; | |
429 | } | |
430 | ||
431 | // 2D formula standard or custom | |
432 | ||
433 | if (fModel > 1 && fModel < 6) { | |
434 | ||
49039a84 | 435 | integ = ((TF2*)fCurrentForm)->Integral(0,kMaxPt, -kMaxY, kMaxY); |
436 | mag = ((TF2*)fCurrentForm)->Integral(0, kMaxPt, -0.1, 0.1) / 0.2; | |
7e4131fc | 437 | return integ/mag; |
438 | } | |
439 | ||
440 | // 2 1D histograms | |
441 | ||
442 | if (fModel == 6) { | |
443 | ||
444 | integ = fHist[1]->Integral(); | |
445 | mag = fHist[0]->GetBinContent(fHist[0]->FindBin(0.)); | |
446 | mag /= fHist[0]->GetBinWidth(fHist[0]->FindBin(0.)); | |
447 | return integ/mag; | |
448 | } | |
449 | ||
450 | // 2D histogram | |
4966b266 | 451 | |
7e4131fc | 452 | if (fModel == 7) { |
453 | ||
454 | // Not tested ... | |
455 | Int_t yBins = fPtYHist->GetNbinsY(); | |
456 | Int_t ptBins = fPtYHist->GetNbinsX(); | |
457 | ||
458 | integ = fPtYHist->Integral(0, ptBins, 0, yBins); | |
459 | mag = fPtYHist->Integral(0, ptBins, (yBins/2)-1, (yBins/2)+1 ) / 2; | |
460 | return integ/mag; | |
461 | } | |
462 | ||
463 | return 1; | |
4966b266 | 464 | } |
465 | ||
466 | ////////////////////////////////////////////////////////////////////////////////// | |
467 | ||
7e4131fc | 468 | void AliGenGeVSim::SetFormula(Int_t pdg) { |
4966b266 | 469 | // |
7e4131fc | 470 | // Private function used by Generate() |
4966b266 | 471 | // |
7e4131fc | 472 | // Configure a formula for a given particle type and model Id (in fModel). |
473 | // If custom formula or histogram was selected the function tries | |
474 | // to find it. | |
475 | // | |
476 | // The function implements naming conventions for custom distributions names | |
477 | // | |
7816887f | 478 | |
7e4131fc | 479 | char buff[40]; |
480 | const char* msg[4] = { | |
481 | "Custom Formula for Pt Y distribution not found [pdg = %d]", | |
482 | "Histogram for Pt distribution not found [pdg = %d]", | |
483 | "Histogram for Y distribution not found [pdg = %d]", | |
484 | "HIstogram for Pt Y dostribution not found [pdg = %d]" | |
485 | }; | |
486 | ||
487 | const char* pattern[8] = { | |
488 | "gevsimDistPtY", "gevsimDist%dPtY", | |
489 | "gevsimHistPt", "gevsimHist%dPt", | |
490 | "gevsimHistY", "gevsimHist%dY", | |
491 | "gevsimHistPtY", "gevsimHist%dPtY" | |
492 | }; | |
493 | ||
494 | const char *where = "SetFormula"; | |
7816887f | 495 | |
7816887f | 496 | |
7e4131fc | 497 | if (fModel < 1 || fModel > 7) |
498 | Error("SetFormula", "Model Id (%d) out of range [1-7]", fModel); | |
499 | ||
500 | ||
501 | // standard models | |
502 | ||
503 | if (fModel == 1) fCurrentForm = fPtFormula; | |
504 | if (fModel > 1 && fModel < 5) fCurrentForm = fPtYFormula[fModel-2]; | |
505 | ||
506 | ||
507 | // custom model defined by a formula | |
508 | ||
7816887f | 509 | if (fModel == 5) { |
510 | ||
7e4131fc | 511 | fCurrentForm = 0; |
512 | fCurrentForm = (TF2*)gROOT->GetFunction(pattern[0]); | |
513 | ||
514 | if (!fCurrentForm) { | |
515 | ||
516 | sprintf(buff, pattern[1], pdg); | |
517 | fCurrentForm = (TF2*)gROOT->GetFunction(buff); | |
518 | ||
519 | if (!fCurrentForm) Error(where, msg[0], pdg); | |
520 | } | |
521 | } | |
522 | ||
523 | // 2 1D histograms | |
524 | ||
525 | if (fModel == 6) { | |
7816887f | 526 | |
7e4131fc | 527 | for (Int_t i=0; i<2; i++) { |
7816887f | 528 | |
7e4131fc | 529 | fHist[i] = 0; |
530 | fHist[i] = (TH1D*)gROOT->FindObject(pattern[2+2*i]); | |
531 | ||
532 | if (!fHist[i]) { | |
533 | ||
534 | sprintf(buff, pattern[3+2*i], pdg); | |
535 | fHist[i] = (TH1D*)gROOT->FindObject(buff); | |
536 | ||
537 | if (!fHist[i]) Error(where, msg[1+i], pdg); | |
538 | } | |
539 | } | |
7816887f | 540 | } |
7e4131fc | 541 | |
542 | // 2d histogram | |
543 | ||
544 | if (fModel == 7) { | |
545 | ||
546 | fPtYHist = 0; | |
547 | fPtYHist = (TH2D*)gROOT->FindObject(pattern[6]); | |
548 | ||
549 | if (!fPtYHist) { | |
550 | ||
551 | sprintf(buff, pattern[7], pdg); | |
552 | fPtYHist = (TH2D*)gROOT->FindObject(buff); | |
553 | } | |
554 | ||
a3d75961 | 555 | if (!fPtYHist) Error(where, msg[3], pdg); |
7e4131fc | 556 | } |
557 | ||
558 | } | |
559 | ||
560 | ////////////////////////////////////////////////////////////////////////////////// | |
561 | ||
562 | void AliGenGeVSim:: AdjustFormula() { | |
563 | // | |
564 | // Private Function | |
565 | // Adjust fomula bounds according to acceptance cuts. | |
566 | // | |
567 | // Since GeVSim is producing "thermal" particles Pt | |
568 | // is cut at 3 GeV even when acceptance extends to grater momenta. | |
569 | // | |
570 | // WARNING ! | |
571 | // If custom formula was provided function preserves | |
572 | // original cuts. | |
573 | // | |
574 | ||
575 | const Double_t kMaxPt = 3.0; | |
576 | const Double_t kMaxY = 2.0; | |
577 | Double_t minPt, maxPt, minY, maxY; | |
578 | ||
579 | ||
580 | if (fModel > 4) return; | |
581 | ||
582 | // max Pt | |
583 | if (TestBit(kPtRange) && fPtMax < kMaxPt ) maxPt = fPtMax; | |
584 | else maxPt = kMaxPt; | |
585 | ||
586 | // min Pt | |
587 | if (TestBit(kPtRange)) minPt = fPtMin; | |
588 | else minPt = 0; | |
589 | ||
590 | if (TestBit(kPtRange) && fPtMin > kMaxPt ) | |
591 | Warning("Acceptance", "Minimum Pt (%3.2f GeV) greater that 3.0 GeV ", fPtMin); | |
592 | ||
593 | // Max Pt < Max P | |
594 | if (TestBit(kMomentumRange) && fPtMax < maxPt) maxPt = fPtMax; | |
595 | ||
596 | // max and min rapidity | |
597 | if (TestBit(kYRange)) { | |
598 | minY = fYMin; | |
599 | maxY = fYMax; | |
600 | } else { | |
601 | minY = -kMaxY; | |
602 | maxY = kMaxY; | |
603 | } | |
604 | ||
605 | // adjust formula | |
606 | ||
607 | if (fModel == 1) { | |
608 | fPtFormula->SetRange(fPtMin, maxPt); | |
609 | fYFormula->SetRange(fYMin, fYMax); | |
610 | } | |
611 | ||
612 | if (fModel > 1) | |
613 | ((TF2*)fCurrentForm)->SetRange(minPt, minY, maxPt, maxY); | |
614 | ||
615 | // azimuthal cut | |
616 | ||
617 | if (TestBit(kPhiRange)) | |
618 | fPhiFormula->SetRange(fPhiMin, fPhiMax); | |
619 | ||
620 | } | |
621 | ||
622 | ////////////////////////////////////////////////////////////////////////////////// | |
623 | ||
624 | void AliGenGeVSim::GetRandomPtY(Double_t &pt, Double_t &y) { | |
625 | // | |
626 | // Private function used by Generate() | |
627 | // | |
628 | // Returns random values of Pt and Y corresponding to selected | |
629 | // distribution. | |
630 | // | |
631 | ||
632 | if (fModel == 1) { | |
633 | pt = fPtFormula->GetRandom(); | |
634 | y = fYFormula->GetRandom(); | |
635 | return; | |
636 | } | |
637 | ||
638 | if (fModel > 1 && fModel < 6) { | |
639 | ((TF2*)fCurrentForm)->GetRandom2(pt, y); | |
640 | return; | |
641 | } | |
642 | ||
643 | if (fModel == 6) { | |
644 | pt = fHist[0]->GetRandom(); | |
645 | y = fHist[1]->GetRandom(); | |
646 | } | |
647 | ||
648 | if (fModel == 7) { | |
649 | fPtYHist->GetRandom2(pt, y); | |
650 | return; | |
651 | } | |
652 | } | |
653 | ||
654 | ////////////////////////////////////////////////////////////////////////////////// | |
655 | ||
656 | void AliGenGeVSim::Init() { | |
657 | // | |
658 | // Standard AliGenerator initializer. | |
659 | // does nothing | |
660 | // | |
7816887f | 661 | } |
662 | ||
663 | ////////////////////////////////////////////////////////////////////////////////// | |
664 | ||
665 | void AliGenGeVSim::Generate() { | |
4966b266 | 666 | // |
667 | // Standard AliGenerator function | |
668 | // This function do actual job and puts particles on stack. | |
669 | // | |
7816887f | 670 | |
7816887f | 671 | PDG_t pdg; // particle type |
672 | Float_t mass; // particle mass | |
673 | Float_t orgin[3] = {0,0,0}; // particle orgin [cm] | |
674 | Float_t polar[3] = {0,0,0}; // polarisation | |
7816887f | 675 | Float_t time = 0; // time of creation |
7816887f | 676 | |
7e4131fc | 677 | Float_t multiplicity = 0; |
678 | Bool_t isMultTotal = kTRUE; | |
679 | ||
7816887f | 680 | Float_t paramScaler; |
7e4131fc | 681 | Float_t directedScaller = 1., ellipticScaller = 1.; |
682 | ||
683 | TLorentzVector *v = new TLorentzVector(0,0,0,0); | |
7816887f | 684 | |
4966b266 | 685 | const Int_t kParent = -1; |
7816887f | 686 | Int_t id; |
687 | ||
7816887f | 688 | // vertexing |
7816887f | 689 | VertexInternal(); |
7816887f | 690 | orgin[0] = fVertex[0]; |
691 | orgin[1] = fVertex[1]; | |
692 | orgin[2] = fVertex[2]; | |
693 | ||
7816887f | 694 | |
695 | // Particle params database | |
696 | ||
697 | TDatabasePDG *db = TDatabasePDG::Instance(); | |
698 | TParticlePDG *type; | |
699 | AliGeVSimParticle *partType; | |
700 | ||
701 | Int_t nType, nParticle, nParam; | |
49039a84 | 702 | const Int_t kNParams = 6; |
7816887f | 703 | |
4966b266 | 704 | // reaction plane determination and model |
4966b266 | 705 | DetermineReactionPlane(); |
7e4131fc | 706 | |
7816887f | 707 | // loop over particle types |
708 | ||
709 | for (nType = 0; nType < fPartTypes->GetEntries(); nType++) { | |
710 | ||
711 | partType = (AliGeVSimParticle *)fPartTypes->At(nType); | |
712 | ||
713 | pdg = (PDG_t)partType->GetPdgCode(); | |
714 | type = db->GetParticle(pdg); | |
715 | mass = type->Mass(); | |
716 | ||
7e4131fc | 717 | fModel = partType->GetModel(); |
718 | SetFormula(pdg); | |
719 | fCurrentForm->SetParameter("mass", mass); | |
7816887f | 720 | |
7816887f | 721 | |
722 | // Evaluation of parameters - loop over parameters | |
723 | ||
49039a84 | 724 | for (nParam = 0; nParam < kNParams; nParam++) { |
7816887f | 725 | |
726 | paramScaler = FindScaler(nParam, pdg); | |
727 | ||
7e4131fc | 728 | if (nParam == 0) |
729 | fCurrentForm->SetParameter("temperature", paramScaler * partType->GetTemperature()); | |
7816887f | 730 | |
731 | if (nParam == 1 && fModel == 1) | |
7e4131fc | 732 | fYFormula->SetParameter("sigmaY", paramScaler * partType->GetSigmaY()); |
7816887f | 733 | |
734 | if (nParam == 2 && fModel == 4) { | |
735 | ||
7e4131fc | 736 | Double_t totalExpVal = paramScaler * partType->GetExpansionVelocity(); |
7816887f | 737 | |
738 | if (totalExpVal == 0.0) totalExpVal = 0.0001; | |
739 | if (totalExpVal == 1.0) totalExpVal = 9.9999; | |
740 | ||
7e4131fc | 741 | fCurrentForm->SetParameter("expVel", totalExpVal); |
7816887f | 742 | } |
743 | ||
744 | // flow | |
7e4131fc | 745 | |
746 | if (nParam == 3) directedScaller = paramScaler; | |
747 | if (nParam == 4) ellipticScaller = paramScaler; | |
7816887f | 748 | |
749 | // multiplicity | |
7e4131fc | 750 | |
751 | if (nParam == 5) { | |
752 | ||
753 | if (partType->IsMultForced()) isMultTotal = partType->IsMultTotal(); | |
754 | else isMultTotal = fIsMultTotal; | |
7816887f | 755 | |
7e4131fc | 756 | multiplicity = paramScaler * partType->GetMultiplicity(); |
757 | multiplicity *= (isMultTotal)? 1 : GetdNdYToTotal(); | |
758 | } | |
7816887f | 759 | } |
760 | ||
7e4131fc | 761 | // Flow defined on the particle type level (not parameterised) |
762 | if (partType->IsFlowSimple()) { | |
763 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(0,0) * directedScaller); | |
764 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(0,0) * ellipticScaller); | |
765 | } | |
766 | ||
767 | AdjustFormula(); | |
768 | ||
769 | ||
770 | Info("Generate","PDG = %d \t Mult = %d", pdg, (Int_t)multiplicity); | |
7816887f | 771 | |
772 | // loop over particles | |
773 | ||
774 | nParticle = 0; | |
7816887f | 775 | while (nParticle < multiplicity) { |
776 | ||
7e4131fc | 777 | Double_t pt, y, phi; // momentum in [pt,y,phi] |
778 | Float_t p[3] = {0,0,0}; // particle momentum | |
7816887f | 779 | |
7e4131fc | 780 | GetRandomPtY(pt, y); |
7816887f | 781 | |
7e4131fc | 782 | // phi distribution configuration when differential flow defined |
783 | // to be optimised in future release | |
7816887f | 784 | |
7e4131fc | 785 | if (!partType->IsFlowSimple()) { |
786 | fPhiFormula->SetParameter(1, partType->GetDirectedFlow(pt,y) * directedScaller); | |
787 | fPhiFormula->SetParameter(2, partType->GetEllipticFlow(pt,y) * ellipticScaller); | |
788 | } | |
7816887f | 789 | |
7e4131fc | 790 | phi = fPhiFormula->GetRandom(); |
7816887f | 791 | |
7e4131fc | 792 | if (!isMultTotal) nParticle++; |
793 | if (fModel > 4 && !CheckPtYPhi(pt,y,phi) ) continue; | |
794 | ||
7816887f | 795 | // coordinate transformation |
7816887f | 796 | v->SetPtEtaPhiM(pt, y, phi, mass); |
797 | ||
798 | p[0] = v->Px(); | |
799 | p[1] = v->Py(); | |
800 | p[2] = v->Pz(); | |
801 | ||
802 | // momentum range test | |
7e4131fc | 803 | if ( !CheckAcceptance(p) ) continue; |
7816887f | 804 | |
805 | // putting particle on the stack | |
806 | ||
642f15cf | 807 | PushTrack(fTrackIt, kParent, pdg, p, orgin, polar, time, kPPrimary, id, fTrackIt); |
7e4131fc | 808 | if (isMultTotal) nParticle++; |
7816887f | 809 | } |
810 | } | |
7e4131fc | 811 | |
daa61231 | 812 | // prepare and store header |
813 | ||
814 | AliGenGeVSimEventHeader *header = new AliGenGeVSimEventHeader("GeVSim header"); | |
815 | TArrayF eventVertex(3,orgin); | |
816 | ||
817 | header->SetPrimaryVertex(eventVertex); | |
818 | header->SetEventPlane(fPsi); | |
819 | header->SetEllipticFlow(fPhiFormula->GetParameter(2)); | |
820 | ||
821 | gAlice->SetGenEventHeader(header); | |
822 | ||
7e4131fc | 823 | delete v; |
7816887f | 824 | } |
825 | ||
826 | ////////////////////////////////////////////////////////////////////////////////// |