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0119ef9a | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | // Generator using AMPT as an external generator | |
19 | ||
20 | #include "AliGenAmpt.h" | |
21 | ||
22 | #include <TClonesArray.h> | |
23 | #include <TGraph.h> | |
24 | #include <TAmpt.h> | |
25 | #include <TLorentzVector.h> | |
26 | #include <TPDGCode.h> | |
27 | #include <TParticle.h> | |
d60fac1e | 28 | #include <TVirtualMC.h> |
29 | #include <TParticlePDG.h> | |
0119ef9a | 30 | #include "AliGenHijingEventHeader.h" |
31 | #define AliGenAmptEventHeader AliGenHijingEventHeader | |
32 | #include "AliAmptRndm.h" | |
33 | #include "AliLog.h" | |
34 | #include "AliRun.h" | |
d60fac1e | 35 | #include "AliDecayer.h" |
0119ef9a | 36 | |
37 | ClassImp(AliGenAmpt) | |
38 | ||
39 | AliGenAmpt::AliGenAmpt() | |
40 | : AliGenMC(), | |
41 | fFrame("CMS"), | |
42 | fMinImpactParam(0.), | |
43 | fMaxImpactParam(5.), | |
44 | fKeep(0), | |
45 | fQuench(0), | |
46 | fShadowing(1), | |
47 | fDecaysOff(1), | |
48 | fTrigger(0), | |
49 | fEvaluate(0), | |
50 | fSelectAll(0), | |
51 | fFlavor(0), | |
52 | fKineBias(0.), | |
53 | fTrials(0), | |
54 | fXsection(0.), | |
55 | fAmpt(0), | |
56 | fPtHardMin(2.0), | |
57 | fPtHardMax(-1), | |
58 | fSpectators(1), | |
59 | fDsigmaDb(0), | |
60 | fDnDb(0), | |
61 | fPtMinJet(-2.5), | |
62 | fEtaMinJet(-20.), | |
63 | fEtaMaxJet(+20.), | |
64 | fPhiMinJet(0.), | |
65 | fPhiMaxJet(TMath::TwoPi()), | |
66 | fRadiation(3), | |
67 | fSimpleJet(kFALSE), | |
68 | fNoGammas(kFALSE), | |
69 | fProjectileSpecn(0), | |
70 | fProjectileSpecp(0), | |
71 | fTargetSpecn(0), | |
72 | fTargetSpecp(0), | |
73 | fLHC(kFALSE), | |
74 | fRandomPz(kFALSE), | |
75 | fNoHeavyQuarks(kFALSE), | |
c6db63eb | 76 | fIsoft(4), |
0119ef9a | 77 | fNtMax(150), |
78 | fIpop(1), | |
79 | fXmu(3.2264), | |
a004b331 | 80 | fAlpha(1./3), |
81 | fStringA(0.5), | |
82 | fStringB(0.9), | |
d60fac1e | 83 | fHeader(new AliGenAmptEventHeader("Ampt")), |
84 | fDecay(kTRUE) | |
0119ef9a | 85 | { |
86 | // Constructor | |
d60fac1e | 87 | fEnergyCMS = 2760.; |
0119ef9a | 88 | AliAmptRndm::SetAmptRandom(GetRandom()); |
89 | } | |
90 | ||
91 | AliGenAmpt::AliGenAmpt(Int_t npart) | |
92 | : AliGenMC(npart), | |
93 | fFrame("CMS"), | |
94 | fMinImpactParam(0.), | |
95 | fMaxImpactParam(5.), | |
96 | fKeep(0), | |
97 | fQuench(0), | |
98 | fShadowing(1), | |
99 | fDecaysOff(1), | |
100 | fTrigger(0), | |
101 | fEvaluate(0), | |
102 | fSelectAll(0), | |
103 | fFlavor(0), | |
104 | fKineBias(0.), | |
105 | fTrials(0), | |
106 | fXsection(0.), | |
107 | fAmpt(0), | |
108 | fPtHardMin(2.0), | |
109 | fPtHardMax(-1), | |
110 | fSpectators(1), | |
111 | fDsigmaDb(0), | |
112 | fDnDb(0), | |
113 | fPtMinJet(-2.5), | |
114 | fEtaMinJet(-20.), | |
115 | fEtaMaxJet(+20.), | |
116 | fPhiMinJet(0.), | |
117 | fPhiMaxJet(2. * TMath::Pi()), | |
118 | fRadiation(3), | |
119 | fSimpleJet(kFALSE), | |
120 | fNoGammas(kFALSE), | |
121 | fProjectileSpecn(0), | |
122 | fProjectileSpecp(0), | |
123 | fTargetSpecn(0), | |
124 | fTargetSpecp(0), | |
125 | fLHC(kFALSE), | |
126 | fRandomPz(kFALSE), | |
127 | fNoHeavyQuarks(kFALSE), | |
0119ef9a | 128 | fIsoft(1), |
129 | fNtMax(150), | |
130 | fIpop(1), | |
131 | fXmu(3.2264), | |
a004b331 | 132 | fAlpha(1./3), |
133 | fStringA(0.5), | |
134 | fStringB(0.9), | |
d60fac1e | 135 | fHeader(new AliGenAmptEventHeader("Ampt")), |
136 | fDecay(kTRUE) | |
0119ef9a | 137 | { |
d60fac1e | 138 | // Default PbPb collisions at 2.76 TeV |
0119ef9a | 139 | |
d60fac1e | 140 | fEnergyCMS = 2760.; |
0119ef9a | 141 | fName = "Ampt"; |
142 | fTitle= "Particle Generator using AMPT"; | |
143 | AliAmptRndm::SetAmptRandom(GetRandom()); | |
144 | } | |
145 | ||
146 | AliGenAmpt::~AliGenAmpt() | |
147 | { | |
148 | // Destructor | |
149 | if ( fDsigmaDb) delete fDsigmaDb; | |
150 | if ( fDnDb) delete fDnDb; | |
151 | if ( fHeader) delete fHeader; | |
152 | } | |
153 | ||
154 | void AliGenAmpt::Init() | |
155 | { | |
156 | // Initialisation | |
157 | ||
158 | fFrame.Resize(8); | |
159 | fTarget.Resize(8); | |
160 | fProjectile.Resize(8); | |
161 | ||
162 | fAmpt = new TAmpt(fEnergyCMS, fFrame, fProjectile, fTarget, | |
163 | fAProjectile, fZProjectile, fATarget, fZTarget, | |
164 | fMinImpactParam, fMaxImpactParam); | |
165 | SetMC(fAmpt); | |
166 | ||
167 | fAmpt->SetIHPR2(2, fRadiation); | |
168 | fAmpt->SetIHPR2(3, fTrigger); | |
169 | fAmpt->SetIHPR2(6, fShadowing); | |
170 | fAmpt->SetIHPR2(12, fDecaysOff); | |
171 | fAmpt->SetIHPR2(21, fKeep); | |
172 | fAmpt->SetHIPR1(8, fPtHardMin); | |
173 | fAmpt->SetHIPR1(9, fPtHardMax); | |
174 | fAmpt->SetHIPR1(10, fPtMinJet); | |
175 | fAmpt->SetHIPR1(50, fSimpleJet); | |
176 | ||
177 | // Quenching | |
178 | // fQuench = 0: no quenching | |
179 | // fQuench = 1: Hijing default | |
180 | // fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14) | |
181 | // fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14) | |
182 | // fQuench = 4: new LHC parameters with log(e) dependence | |
183 | // fQuench = 5: new RHIC parameters with log(e) dependence | |
184 | fAmpt->SetIHPR2(50, 0); | |
185 | if (fQuench > 0) | |
186 | fAmpt->SetIHPR2(4, 1); | |
187 | else | |
188 | fAmpt->SetIHPR2(4, 0); | |
189 | ||
190 | if (fQuench == 2) { | |
191 | fAmpt->SetHIPR1(14, 1.1); | |
192 | fAmpt->SetHIPR1(11, 3.7); | |
193 | } else if (fQuench == 3) { | |
194 | fAmpt->SetHIPR1(14, 0.20); | |
195 | fAmpt->SetHIPR1(11, 2.5); | |
196 | } else if (fQuench == 4) { | |
197 | fAmpt->SetIHPR2(50, 1); | |
198 | fAmpt->SetHIPR1(14, 4.*0.34); | |
199 | fAmpt->SetHIPR1(11, 3.7); | |
200 | } else if (fQuench == 5) { | |
201 | fAmpt->SetIHPR2(50, 1); | |
202 | fAmpt->SetHIPR1(14, 0.34); | |
203 | fAmpt->SetHIPR1(11, 2.5); | |
204 | } | |
205 | ||
206 | // Heavy quarks | |
207 | if (fNoHeavyQuarks) { | |
208 | fAmpt->SetIHPR2(49, 1); | |
209 | } else { | |
210 | fAmpt->SetIHPR2(49, 0); | |
211 | } | |
212 | ||
213 | // Ampt specific | |
214 | fAmpt->SetIsoft(fIsoft); | |
215 | fAmpt->SetNtMax(fNtMax); | |
216 | fAmpt->SetIpop(fIpop); | |
217 | fAmpt->SetXmu(fXmu); | |
a004b331 | 218 | fAmpt->SetAlpha(fAlpha); |
219 | fAmpt->SetStringFrag(fStringA, fStringB); | |
0119ef9a | 220 | |
221 | AliGenMC::Init(); | |
222 | ||
223 | // Initialize Ampt | |
224 | fAmpt->Initialize(); | |
225 | if (fEvaluate) | |
226 | EvaluateCrossSections(); | |
227 | } | |
228 | ||
229 | void AliGenAmpt::Generate() | |
230 | { | |
231 | // Generate one event | |
232 | ||
233 | Float_t polar[3] = {0,0,0}; | |
234 | Float_t origin[3] = {0,0,0}; | |
235 | Float_t origin0[3] = {0,0,0}; | |
cdfa7be6 | 236 | Float_t time0 = 0.; |
0119ef9a | 237 | Float_t p[3]; |
238 | Float_t tof; | |
239 | ||
240 | // converts from mm/c to s | |
241 | const Float_t kconv = 0.001/2.99792458e8; | |
242 | ||
243 | Int_t nt = 0; | |
244 | Int_t jev = 0; | |
245 | Int_t j, kf, ks, ksp, imo; | |
246 | kf = 0; | |
247 | ||
248 | fTrials = 0; | |
249 | for (j = 0;j < 3; j++) | |
250 | origin0[j] = fOrigin[j]; | |
cdfa7be6 | 251 | time0 = fTimeOrigin; |
0119ef9a | 252 | |
253 | if(fVertexSmear == kPerEvent) { | |
254 | Vertex(); | |
255 | for (j=0; j < 3; j++) | |
256 | origin0[j] = fVertex[j]; | |
cdfa7be6 | 257 | time0 = fTime; |
0119ef9a | 258 | } |
259 | ||
260 | Float_t sign = (fRandomPz && (Rndm() < 0.5))? -1. : 1.; | |
261 | ||
262 | while(1) { | |
263 | // Generate one event | |
264 | Int_t fpemask = gSystem->GetFPEMask(); | |
265 | gSystem->SetFPEMask(0); | |
266 | fAmpt->GenerateEvent(); | |
267 | gSystem->SetFPEMask(fpemask); | |
268 | fTrials++; | |
269 | fNprimaries = 0; | |
270 | fAmpt->ImportParticles(&fParticles,"All"); | |
271 | Int_t np = fParticles.GetEntriesFast(); | |
272 | if (np == 0 ) | |
273 | continue; | |
274 | ||
275 | if (fTrigger != kNoTrigger) { | |
276 | if (!CheckTrigger()) | |
277 | continue; | |
278 | } | |
d60fac1e | 279 | |
280 | AliDecayer *decayer = 0; | |
281 | if (gMC) | |
282 | decayer = gMC->GetDecayer(); | |
283 | ||
284 | if (decayer&&fDecay) { | |
285 | TClonesArray arr("TParticle",100); | |
286 | Int_t np2 = np; | |
287 | for (Int_t i = 0; i < np; i++) { | |
288 | TParticle *iparticle = (TParticle *)fParticles.At(i); | |
289 | if (!Stable(iparticle)) | |
290 | continue; | |
8682bea4 | 291 | kf = TMath::Abs(iparticle->GetPdgCode()); |
d60fac1e | 292 | if (kf==92) |
293 | continue; | |
294 | if (0) { // this turned out to be too cumbersome! | |
295 | if (kf!=331&&kf!=3114&&kf!=3114&&kf!=411&&kf!=-4122&&kf!=-3324&&kf!=-3312&&kf!=-3114&& | |
296 | kf!=-311&&kf!=3214&&kf!=-3214&&kf!=-433&&kf!=413&&kf!=3122&&kf!=-3122&&kf!=-413&& | |
297 | kf!=-421&&kf!=-423&&kf!=3324&&kf!=-313&&kf!=213&&kf!=-213&&kf!=3314&&kf!=3222&& | |
298 | kf!=-3222&&kf!=3224&&kf!=-3224&&kf!=-4212&&kf!=4212&&kf!=433&&kf!=423&&kf!=-3322&& | |
299 | kf!=3322&&kf!=-3314) | |
300 | continue; //decay eta',Sigma*+,Sigma*-,D+,Lambda_c-,Xi*0_bar,Xi-_bar,Sigma*-, | |
301 | // K0_bar,Sigma*0,Sigma*0_bar,D*_s-,D*+,Lambda0,Lambda0_bar,D*- | |
302 | // D0_bar,D*0_bar,Xi*0,K*0_bar,rho+,rho-,Xi*-,Sigma-, | |
303 | // Sigma+,Sigma*+,Sigma*-,Sigma_c-,Sigma_c+,D*_s+,D*0,Xi0_bar | |
304 | // Xi0,Xi*+ | |
305 | } else { // really only decay particles if there are not known to Geant3 | |
306 | if (gMC->IdFromPDG(kf)>0) | |
307 | continue; | |
308 | } | |
309 | if (0) { // defining the particle for Geant3 leads to a floating point exception. | |
310 | TParticlePDG *pdg = iparticle->GetPDG(1); | |
311 | //pdg->Print(); printf("%s\n",pdg->ParticleClass()); | |
312 | TString ptype(pdg->ParticleClass()); | |
313 | TMCParticleType mctype(kPTUndefined); | |
314 | if (ptype=="Baryon" || ptype=="Meson") | |
315 | mctype = kPTHadron; | |
316 | gMC->DefineParticle(pdg->PdgCode(), pdg->GetName(), mctype, pdg->Mass(), pdg->Charge(), pdg->Lifetime(), | |
317 | ptype,pdg->Width(), (Int_t)pdg->Spin(), (Int_t)pdg->Parity(), 0, | |
318 | (Int_t)pdg->Isospin(), 0, 0, 0, 0, pdg->Stable()); | |
319 | gMC->SetUserDecay(pdg->PdgCode()); | |
320 | continue; | |
321 | } | |
322 | ||
323 | TLorentzVector pmom(iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy()); | |
324 | decayer->Decay(kf,&pmom); | |
325 | decayer->ImportParticles(&arr); | |
326 | Int_t ndecayed = arr.GetEntries(); | |
327 | if (ndecayed>1) { | |
328 | if (np2+ndecayed>fParticles.GetSize()) | |
329 | fParticles.Expand(2*fParticles.GetSize()); | |
330 | //arr.Print(); | |
331 | iparticle->SetStatusCode(2); | |
332 | iparticle->SetFirstDaughter(np2); | |
333 | for (Int_t jj = 1; jj < ndecayed; jj++) { | |
334 | TParticle *jp = (TParticle *)arr.At(jj); | |
335 | if (jp->GetFirstMother()!=1) | |
336 | continue; | |
337 | TParticle *newp = new(fParticles[np2]) TParticle(jp->GetPdgCode(), | |
338 | 1, | |
339 | i, | |
340 | -1, | |
341 | -1, | |
342 | -1, | |
343 | jp->Px(),jp->Py(),jp->Pz(),jp->Energy(), | |
344 | jp->Vx(),jp->Vy(),jp->Vz(),jp->T()); | |
345 | newp->SetUniqueID(999); | |
346 | np2++; | |
347 | } | |
348 | iparticle->SetLastDaughter(np2-1); | |
349 | } | |
350 | } | |
351 | np = fParticles.GetEntries(); | |
352 | if (np!=np2) { | |
353 | AliError(Form("Something is fishy: %d %d\n", np,np2)); | |
354 | } | |
355 | } else { | |
356 | if (fDecay) | |
357 | AliError("No decayer found, but fDecay==kTRUE!"); | |
358 | } | |
359 | ||
0119ef9a | 360 | if (fLHC) |
361 | Boost(); | |
362 | ||
363 | Int_t nc = 0; | |
364 | Int_t* newPos = new Int_t[np]; | |
365 | Int_t* pSelected = new Int_t[np]; | |
366 | ||
367 | for (Int_t i = 0; i < np; i++) { | |
368 | newPos[i] = i; | |
369 | pSelected[i] = 0; | |
370 | } | |
371 | ||
372 | // Get event vertex | |
373 | //TParticle * iparticle = (TParticle *) fParticles.At(0); | |
374 | fVertex[0] = origin0[0]; | |
375 | fVertex[1] = origin0[1]; | |
376 | fVertex[2] = origin0[2]; | |
cdfa7be6 | 377 | fTime = time0; |
0119ef9a | 378 | |
379 | // First select parent particles | |
380 | for (Int_t i = 0; i < np; i++) { | |
381 | TParticle *iparticle = (TParticle *) fParticles.At(i); | |
382 | ||
383 | // Is this a parent particle ? | |
384 | if (Stable(iparticle)) continue; | |
385 | Bool_t selected = kTRUE; | |
386 | Bool_t hasSelectedDaughters = kFALSE; | |
387 | kf = iparticle->GetPdgCode(); | |
388 | ks = iparticle->GetStatusCode(); | |
389 | if (kf == 92) | |
390 | continue; | |
391 | ||
392 | if (!fSelectAll) | |
393 | selected = KinematicSelection(iparticle, 0) && SelectFlavor(kf); | |
394 | hasSelectedDaughters = DaughtersSelection(iparticle); | |
395 | ||
396 | // Put particle on the stack if it is either selected or | |
397 | // it is the mother of at least one seleted particle | |
398 | if (selected || hasSelectedDaughters) { | |
399 | nc++; | |
400 | pSelected[i] = 1; | |
401 | } // selected | |
402 | } // particle loop parents | |
403 | ||
404 | // Now select the final state particles | |
405 | fProjectileSpecn = 0; | |
406 | fProjectileSpecp = 0; | |
407 | fTargetSpecn = 0; | |
408 | fTargetSpecp = 0; | |
409 | for (Int_t i = 0; i<np; i++) { | |
410 | TParticle *iparticle = (TParticle *) fParticles.At(i); | |
411 | // Is this a final state particle ? | |
412 | if (!Stable(iparticle)) | |
413 | continue; | |
414 | Bool_t selected = kTRUE; | |
415 | kf = iparticle->GetPdgCode(); | |
d60fac1e | 416 | if (kf == 92) |
417 | continue; | |
0119ef9a | 418 | ks = iparticle->GetStatusCode(); |
419 | ksp = iparticle->GetUniqueID(); | |
420 | ||
421 | // -------------------------------------------------------------------------- | |
422 | // Count spectator neutrons and protons | |
423 | if(ksp == 0 || ksp == 1) { | |
424 | if(kf == kNeutron) fProjectileSpecn += 1; | |
425 | if(kf == kProton) fProjectileSpecp += 1; | |
426 | } else if(ksp == 10 || ksp == 11) { | |
427 | if(kf == kNeutron) fTargetSpecn += 1; | |
428 | if(kf == kProton) fTargetSpecp += 1; | |
429 | } | |
430 | // -------------------------------------------------------------------------- | |
431 | if (!fSelectAll) { | |
432 | selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf); | |
433 | if (!fSpectators && selected) | |
434 | selected = (ksp != 0 && ksp != 1 && ksp != 10 && ksp != 11); | |
435 | } | |
436 | ||
437 | // Put particle on the stack if selected | |
438 | if (selected) { | |
439 | nc++; | |
440 | pSelected[i] = 1; | |
68a6e988 | 441 | if (0) printf("---> %d %d %d %s\n",i,nc,kf,iparticle->GetName()); |
0119ef9a | 442 | } // selected |
443 | } // particle loop final state | |
444 | ||
0119ef9a | 445 | // Write particles to stack |
446 | for (Int_t i = 0; i<np; i++) { | |
447 | TParticle *iparticle = (TParticle *) fParticles.At(i); | |
448 | Bool_t hasMother = (iparticle->GetFirstMother() >=0); | |
449 | Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0); | |
450 | if (pSelected[i]) { | |
451 | kf = iparticle->GetPdgCode(); | |
452 | ks = iparticle->GetStatusCode(); | |
453 | p[0] = iparticle->Px(); | |
454 | p[1] = iparticle->Py(); | |
455 | p[2] = iparticle->Pz() * sign; | |
456 | origin[0] = origin0[0]+iparticle->Vx()/10; | |
457 | origin[1] = origin0[1]+iparticle->Vy()/10; | |
458 | origin[2] = origin0[2]+iparticle->Vz()/10; | |
cdfa7be6 | 459 | tof = time0+kconv * iparticle->T(); |
460 | ||
0119ef9a | 461 | imo = -1; |
462 | TParticle* mother = 0; | |
463 | if (hasMother) { | |
464 | imo = iparticle->GetFirstMother(); | |
465 | mother = (TParticle *) fParticles.At(imo); | |
466 | imo = (mother->GetPdgCode() != 92) ? newPos[imo] : -1; | |
467 | } // if has mother | |
468 | Bool_t tFlag = (fTrackIt && !hasDaughter); | |
469 | PushTrack(tFlag,imo,kf,p,origin,polar,tof,kPNoProcess,nt, 1., ks); | |
470 | fNprimaries++; | |
471 | KeepTrack(nt); | |
472 | newPos[i] = nt; | |
473 | } // if selected | |
474 | } // particle loop | |
475 | delete[] newPos; | |
476 | delete[] pSelected; | |
477 | ||
478 | AliInfo(Form("\n I've put %i particles on the stack \n",nc)); | |
479 | if (nc > 0) { | |
480 | jev += nc; | |
481 | if (jev >= fNpart || fNpart == -1) { | |
482 | fKineBias = Float_t(fNpart)/Float_t(fTrials); | |
483 | AliInfo(Form("\n Trials: %i %i %i\n",fTrials, fNpart, jev)); | |
484 | break; | |
485 | } | |
486 | } | |
487 | } // event loop | |
488 | MakeHeader(); | |
489 | SetHighWaterMark(nt); | |
490 | } | |
491 | ||
492 | void AliGenAmpt::EvaluateCrossSections() | |
493 | { | |
494 | // Glauber Calculation of geometrical x-section | |
495 | ||
496 | Float_t xTot = 0.; // barn | |
497 | Float_t xTotHard = 0.; // barn | |
498 | Float_t xPart = 0.; // barn | |
499 | Float_t xPartHard = 0.; // barn | |
500 | Float_t sigmaHard = 0.1; // mbarn | |
501 | Float_t bMin = 0.; | |
502 | Float_t bMax = fAmpt->GetHIPR1(34)+fAmpt->GetHIPR1(35); | |
503 | const Float_t kdib = 0.2; | |
504 | Int_t kMax = Int_t((bMax-bMin)/kdib)+1; | |
505 | ||
506 | printf("\n Projectile Radius (fm): %f \n",fAmpt->GetHIPR1(34)); | |
507 | printf("\n Target Radius (fm): %f \n",fAmpt->GetHIPR1(35)); | |
508 | ||
509 | Int_t i; | |
510 | Float_t oldvalue= 0.; | |
48eb126c | 511 | Float_t* b = new Float_t[kMax]; memset(b,0,kMax*sizeof(Float_t)); |
512 | Float_t* si1 = new Float_t[kMax]; memset(si1,0,kMax*sizeof(Float_t)); | |
513 | Float_t* si2 = new Float_t[kMax]; memset(si2,0,kMax*sizeof(Float_t)); | |
0119ef9a | 514 | for (i = 0; i < kMax; i++) { |
515 | Float_t xb = bMin+i*kdib; | |
516 | Float_t ov=fAmpt->Profile(xb); | |
517 | Float_t gb = 2.*0.01*fAmpt->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fAmpt->GetHINT1(12)*ov)); | |
518 | Float_t gbh = 2.*0.01*fAmpt->GetHIPR1(40)*kdib*xb*sigmaHard*ov; | |
519 | xTot+=gb; | |
520 | xTotHard += gbh; | |
521 | printf("profile %f %f %f\n", xb, ov, fAmpt->GetHINT1(12)); | |
522 | ||
523 | if (xb > fMinImpactParam && xb < fMaxImpactParam) { | |
524 | xPart += gb; | |
525 | xPartHard += gbh; | |
526 | } | |
527 | ||
528 | if ((oldvalue) && ((xTot-oldvalue)/oldvalue<0.0001)) | |
529 | break; | |
530 | oldvalue = xTot; | |
531 | printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot); | |
532 | printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard); | |
533 | if (i>0) { | |
534 | si1[i] = gb/kdib; | |
535 | si2[i] = gbh/gb; | |
536 | b[i] = xb; | |
537 | } | |
538 | } | |
539 | ||
540 | printf("\n Total cross section (barn): %f \n",xTot); | |
541 | printf("\n Hard cross section (barn): %f \n \n",xTotHard); | |
542 | printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.); | |
543 | printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.); | |
544 | ||
545 | // Store result as a graph | |
546 | b[0] = 0; | |
547 | si1[0] = 0; | |
548 | si2[0]=si2[1]; | |
549 | delete fDsigmaDb; | |
550 | fDsigmaDb = new TGraph(i, b, si1); | |
551 | delete fDnDb; | |
552 | fDnDb = new TGraph(i, b, si2); | |
553 | } | |
554 | ||
555 | Bool_t AliGenAmpt::DaughtersSelection(TParticle* iparticle) | |
556 | { | |
557 | // Looks recursively if one of the daughters has been selected | |
558 | //printf("\n Consider daughters %d:",iparticle->GetPdgCode()); | |
559 | Int_t imin = -1; | |
560 | Int_t imax = -1; | |
561 | Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0); | |
562 | Bool_t selected = kFALSE; | |
563 | if (hasDaughters) { | |
564 | imin = iparticle->GetFirstDaughter(); | |
565 | imax = iparticle->GetLastDaughter(); | |
566 | for (Int_t i = imin; i <= imax; i++){ | |
567 | TParticle * jparticle = (TParticle *) fParticles.At(i); | |
568 | Int_t ip = jparticle->GetPdgCode(); | |
569 | if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) { | |
570 | selected=kTRUE; break; | |
571 | } | |
572 | if (DaughtersSelection(jparticle)) {selected=kTRUE; break; } | |
573 | } | |
574 | } else { | |
575 | return kFALSE; | |
576 | } | |
577 | return selected; | |
578 | } | |
579 | ||
580 | Bool_t AliGenAmpt::SelectFlavor(Int_t pid) | |
581 | { | |
582 | // Select flavor of particle | |
583 | // 0: all | |
584 | // 4: charm and beauty | |
585 | // 5: beauty | |
586 | Bool_t res = 0; | |
587 | ||
588 | if (fFlavor == 0) { | |
589 | res = kTRUE; | |
590 | } else { | |
591 | Int_t ifl = TMath::Abs(pid/100); | |
592 | if (ifl > 10) ifl/=10; | |
593 | res = (fFlavor == ifl); | |
594 | } | |
595 | ||
596 | // This part if gamma writing is inhibited | |
597 | if (fNoGammas) | |
598 | res = res && (pid != kGamma && pid != kPi0); | |
599 | ||
600 | return res; | |
601 | } | |
602 | ||
d60fac1e | 603 | Bool_t AliGenAmpt::Stable(TParticle* particle) const |
0119ef9a | 604 | { |
605 | // Return true for a stable particle | |
606 | ||
d60fac1e | 607 | if (!particle) |
608 | return kFALSE; | |
0119ef9a | 609 | if (particle->GetFirstDaughter() < 0 ) |
0119ef9a | 610 | return kTRUE; |
d60fac1e | 611 | return kFALSE; |
0119ef9a | 612 | } |
613 | ||
614 | void AliGenAmpt::MakeHeader() | |
615 | { | |
616 | // Fills the event header, to be called after each event | |
617 | ||
618 | fHeader->SetNProduced(fNprimaries); | |
619 | fHeader->SetImpactParameter(fAmpt->GetHINT1(19)); | |
620 | fHeader->SetTotalEnergy(fAmpt->GetEATT()); | |
621 | fHeader->SetHardScatters(fAmpt->GetJATT()); | |
622 | fHeader->SetParticipants(fAmpt->GetNP(), fAmpt->GetNT()); | |
623 | fHeader->SetCollisions(fAmpt->GetN0(), | |
624 | fAmpt->GetN01(), | |
625 | fAmpt->GetN10(), | |
626 | fAmpt->GetN11()); | |
627 | fHeader->SetSpectators(fProjectileSpecn, fProjectileSpecp, | |
628 | fTargetSpecn,fTargetSpecp); | |
629 | fHeader->SetReactionPlaneAngle(fAmpt->GetHINT1(20)); | |
630 | //printf("Impact Parameter %13.3f \n", fAmpt->GetHINT1(19)); | |
631 | ||
632 | // 4-momentum vectors of the triggered jets. | |
633 | // Before final state gluon radiation. | |
634 | TLorentzVector* jet1 = new TLorentzVector(fAmpt->GetHINT1(21), | |
635 | fAmpt->GetHINT1(22), | |
636 | fAmpt->GetHINT1(23), | |
637 | fAmpt->GetHINT1(24)); | |
638 | ||
639 | TLorentzVector* jet2 = new TLorentzVector(fAmpt->GetHINT1(31), | |
640 | fAmpt->GetHINT1(32), | |
641 | fAmpt->GetHINT1(33), | |
642 | fAmpt->GetHINT1(34)); | |
643 | // After final state gluon radiation. | |
644 | TLorentzVector* jet3 = new TLorentzVector(fAmpt->GetHINT1(26), | |
645 | fAmpt->GetHINT1(27), | |
646 | fAmpt->GetHINT1(28), | |
647 | fAmpt->GetHINT1(29)); | |
648 | ||
649 | TLorentzVector* jet4 = new TLorentzVector(fAmpt->GetHINT1(36), | |
650 | fAmpt->GetHINT1(37), | |
651 | fAmpt->GetHINT1(38), | |
652 | fAmpt->GetHINT1(39)); | |
653 | fHeader->SetJets(jet1, jet2, jet3, jet4); | |
654 | // Bookkeeping for kinematic bias | |
655 | fHeader->SetTrials(fTrials); | |
656 | // Event Vertex | |
657 | fHeader->SetPrimaryVertex(fVertex); | |
cdfa7be6 | 658 | fHeader->SetInteractionTime(fTime); |
0119ef9a | 659 | |
660 | fCollisionGeometry = fHeader; | |
661 | AddHeader(fHeader); | |
662 | } | |
663 | ||
664 | ||
665 | Bool_t AliGenAmpt::CheckTrigger() | |
666 | { | |
667 | // Check the kinematic trigger condition | |
668 | ||
669 | Bool_t triggered = kFALSE; | |
670 | ||
671 | if (fTrigger == 1) { | |
672 | // jet-jet Trigger | |
673 | TLorentzVector* jet1 = new TLorentzVector(fAmpt->GetHINT1(26), | |
674 | fAmpt->GetHINT1(27), | |
675 | fAmpt->GetHINT1(28), | |
676 | fAmpt->GetHINT1(29)); | |
677 | ||
678 | TLorentzVector* jet2 = new TLorentzVector(fAmpt->GetHINT1(36), | |
679 | fAmpt->GetHINT1(37), | |
680 | fAmpt->GetHINT1(38), | |
681 | fAmpt->GetHINT1(39)); | |
682 | Double_t eta1 = jet1->Eta(); | |
683 | Double_t eta2 = jet2->Eta(); | |
684 | Double_t phi1 = jet1->Phi(); | |
685 | Double_t phi2 = jet2->Phi(); | |
686 | //printf("\n Trigger: %f %f %f %f", fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet); | |
687 | if ( (eta1 < fEtaMaxJet && eta1 > fEtaMinJet && | |
688 | phi1 < fPhiMaxJet && phi1 > fPhiMinJet) | |
689 | || | |
690 | (eta2 < fEtaMaxJet && eta2 > fEtaMinJet && | |
691 | phi2 < fPhiMaxJet && phi2 > fPhiMinJet) | |
692 | ) | |
693 | triggered = kTRUE; | |
694 | } else if (fTrigger == 2) { | |
695 | // Gamma Jet | |
696 | Int_t np = fParticles.GetEntriesFast(); | |
697 | for (Int_t i = 0; i < np; i++) { | |
698 | TParticle* part = (TParticle*) fParticles.At(i); | |
699 | Int_t kf = part->GetPdgCode(); | |
700 | Int_t ksp = part->GetUniqueID(); | |
701 | if (kf == 22 && ksp == 40) { | |
702 | Float_t phi = part->Phi(); | |
703 | Float_t eta = part->Eta(); | |
704 | if (eta < fEtaMaxJet && | |
705 | eta > fEtaMinJet && | |
706 | phi < fPhiMaxJet && | |
707 | phi > fPhiMinJet) { | |
708 | triggered = 1; | |
709 | break; | |
710 | } // check phi,eta within limits | |
711 | } // direct gamma ? | |
712 | } // particle loop | |
713 | } // fTrigger == 2 | |
714 | return triggered; | |
715 | } |