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e36044d6 | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
e36044d6 | 17 | |
62d0ae06 | 18 | // Base class for generators using external MC generators. |
19 | // For example AliGenPythia using Pythia. | |
20 | // Provides basic functionality: setting of kinematic cuts on | |
21 | // decay products and particle selection. | |
22 | // andreas.morsch@cern.ch | |
23 | ||
ac3faee4 | 24 | #include <TClonesArray.h> |
65de9f86 | 25 | #include <TMath.h> |
116cbefd | 26 | #include <TPDGCode.h> |
e36044d6 | 27 | #include <TParticle.h> |
28 | ||
116cbefd | 29 | #include "AliGenMC.h" |
ac3faee4 | 30 | #include "AliGeometry.h" |
116cbefd | 31 | |
198bb1c7 | 32 | ClassImp(AliGenMC) |
e36044d6 | 33 | |
34 | AliGenMC::AliGenMC() | |
1c56e311 | 35 | :AliGenerator(), |
36 | fParticles(0), | |
37 | fParentSelect(8), | |
38 | fChildSelect(8), | |
39 | fCutOnChild(0), | |
40 | fChildPtMin(0.), | |
41 | fChildPtMax(1.e10), | |
42 | fChildPMin(0.), | |
43 | fChildPMax(1.e10), | |
44 | fChildPhiMin(0.), | |
45 | fChildPhiMax(2. * TMath::Pi()), | |
46 | fChildThetaMin(0.), | |
47 | fChildThetaMax(TMath::Pi()), | |
48 | fChildYMin(-12.), | |
49 | fChildYMax(12.), | |
50 | fXingAngleX(0.), | |
51 | fXingAngleY(0.), | |
52 | fForceDecay(kAll), | |
53 | fMaxLifeTime(1.e-15), | |
54 | fAProjectile(1), | |
55 | fZProjectile(1), | |
56 | fATarget(1), | |
57 | fZTarget(1), | |
58 | fProjectile("P"), | |
59 | fTarget("P"), | |
60 | fDyBoost(0.), | |
61 | fGeometryAcceptance(0), | |
62 | fPdgCodeParticleforAcceptanceCut(0), | |
63 | fNumberOfAcceptedParticles(2) | |
e36044d6 | 64 | { |
65 | // Default Constructor | |
e36044d6 | 66 | } |
67 | ||
68 | AliGenMC::AliGenMC(Int_t npart) | |
1c56e311 | 69 | :AliGenerator(npart), |
70 | fParticles(0), | |
71 | fParentSelect(8), | |
72 | fChildSelect(8), | |
73 | fCutOnChild(0), | |
74 | fChildPtMin(0.), | |
75 | fChildPtMax(1.e10), | |
76 | fChildPMin(0.), | |
77 | fChildPMax(1.e10), | |
78 | fChildPhiMin(0.), | |
79 | fChildPhiMax(2. * TMath::Pi()), | |
80 | fChildThetaMin(0.), | |
81 | fChildThetaMax(TMath::Pi()), | |
82 | fChildYMin(-12.), | |
83 | fChildYMax(12.), | |
84 | fXingAngleX(0.), | |
85 | fXingAngleY(0.), | |
86 | fForceDecay(kAll), | |
87 | fMaxLifeTime(1.e-15), | |
88 | fAProjectile(1), | |
89 | fZProjectile(1), | |
90 | fATarget(1), | |
91 | fZTarget(1), | |
92 | fProjectile("P"), | |
93 | fTarget("P"), | |
94 | fDyBoost(0.), | |
95 | fGeometryAcceptance(0), | |
96 | fPdgCodeParticleforAcceptanceCut(0), | |
97 | fNumberOfAcceptedParticles(2) | |
e36044d6 | 98 | { |
99 | // Constructor | |
e36044d6 | 100 | // |
e36044d6 | 101 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; |
102 | } | |
103 | ||
198bb1c7 | 104 | AliGenMC::AliGenMC(const AliGenMC & mc): |
1c56e311 | 105 | AliGenerator(mc), |
106 | fParticles(0), | |
107 | fParentSelect(8), | |
108 | fChildSelect(8), | |
109 | fCutOnChild(0), | |
110 | fChildPtMin(0.), | |
111 | fChildPtMax(1.e10), | |
112 | fChildPMin(0.), | |
113 | fChildPMax(1.e10), | |
114 | fChildPhiMin(0.), | |
115 | fChildPhiMax(2. * TMath::Pi()), | |
116 | fChildThetaMin(0.), | |
117 | fChildThetaMax(TMath::Pi()), | |
118 | fChildYMin(-12.), | |
119 | fChildYMax(12.), | |
120 | fXingAngleX(0.), | |
121 | fXingAngleY(0.), | |
122 | fForceDecay(kAll), | |
123 | fMaxLifeTime(1.e-15), | |
124 | fAProjectile(1), | |
125 | fZProjectile(1), | |
126 | fATarget(1), | |
127 | fZTarget(1), | |
128 | fProjectile("P"), | |
129 | fTarget("P"), | |
130 | fDyBoost(0.), | |
131 | fGeometryAcceptance(0), | |
132 | fPdgCodeParticleforAcceptanceCut(0), | |
133 | fNumberOfAcceptedParticles(2) | |
e36044d6 | 134 | { |
198bb1c7 | 135 | // Copy constructor |
136 | mc.Copy(*this); | |
e36044d6 | 137 | } |
138 | ||
139 | AliGenMC::~AliGenMC() | |
140 | { | |
141 | // Destructor | |
142 | } | |
143 | ||
144 | void AliGenMC::Init() | |
145 | { | |
146 | // | |
147 | // Initialization | |
148 | switch (fForceDecay) { | |
149 | case kSemiElectronic: | |
150 | case kDiElectron: | |
151 | case kBJpsiDiElectron: | |
152 | case kBPsiPrimeDiElectron: | |
47fc6bd5 | 153 | fChildSelect[0] = kElectron; |
e36044d6 | 154 | break; |
2dcb5874 | 155 | case kHardMuons: |
e36044d6 | 156 | case kSemiMuonic: |
157 | case kDiMuon: | |
158 | case kBJpsiDiMuon: | |
159 | case kBPsiPrimeDiMuon: | |
160 | case kPiToMu: | |
161 | case kKaToMu: | |
cd159249 | 162 | case kWToMuon: |
163 | case kWToCharmToMuon: | |
2f299526 | 164 | case kZDiMuon: |
e36044d6 | 165 | fChildSelect[0]=kMuonMinus; |
166 | break; | |
cd159249 | 167 | case kWToCharm: |
168 | break; | |
e36044d6 | 169 | case kHadronicD: |
170 | fChildSelect[0]=kPiPlus; | |
171 | fChildSelect[1]=kKPlus; | |
172 | break; | |
00cb2f27 | 173 | case kPhiKK: |
027677ae | 174 | fChildSelect[0]=kKPlus; |
56d47239 | 175 | break; |
176 | case kBJpsi: | |
177 | fChildSelect[0]=443; | |
178 | break; | |
62d0ae06 | 179 | case kOmega: |
e36044d6 | 180 | case kAll: |
181 | case kNoDecay: | |
d5f86442 | 182 | case kNoDecayHeavy: |
e36044d6 | 183 | break; |
184 | } | |
36d770d9 | 185 | |
186 | if (fZTarget != 0 && fAProjectile != 0) | |
187 | { | |
188 | fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) / | |
189 | (Double_t(fZTarget) * Double_t(fAProjectile))); | |
190 | } | |
e36044d6 | 191 | } |
192 | ||
193 | ||
62d0ae06 | 194 | Bool_t AliGenMC::ParentSelected(Int_t ip) const |
e36044d6 | 195 | { |
196 | // True if particle is in list of parent particles to be selected | |
197 | for (Int_t i=0; i<8; i++) | |
198 | { | |
62d0ae06 | 199 | if (fParentSelect.At(i) == ip) return kTRUE; |
e36044d6 | 200 | } |
201 | return kFALSE; | |
202 | } | |
203 | ||
62d0ae06 | 204 | Bool_t AliGenMC::ChildSelected(Int_t ip) const |
e36044d6 | 205 | { |
206 | // True if particle is in list of decay products to be selected | |
207 | for (Int_t i=0; i<5; i++) | |
208 | { | |
62d0ae06 | 209 | if (fChildSelect.At(i) == ip) return kTRUE; |
e36044d6 | 210 | } |
211 | return kFALSE; | |
212 | } | |
213 | ||
62d0ae06 | 214 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const |
e36044d6 | 215 | { |
216 | // Perform kinematic selection | |
e36044d6 | 217 | Float_t pz = particle->Pz(); |
218 | Float_t e = particle->Energy(); | |
219 | Float_t pt = particle->Pt(); | |
220 | Float_t p = particle->P(); | |
221 | Float_t theta = particle->Theta(); | |
cf01ee36 | 222 | Float_t mass = particle->GetCalcMass(); |
95450c6d | 223 | Float_t mt2 = pt * pt + mass * mass; |
0b6d2cb3 | 224 | Float_t phi = particle->Phi(); |
95450c6d | 225 | |
95450c6d | 226 | Double_t y, y0; |
227 | ||
fef61e14 | 228 | if (TMath::Abs(pz) < e) { |
95450c6d | 229 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
230 | } else { | |
231 | y = 1.e10; | |
232 | } | |
e36044d6 | 233 | |
95450c6d | 234 | if (mt2) { |
235 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); | |
e36044d6 | 236 | } else { |
95450c6d | 237 | if (TMath::Abs(y) < 1.e10) { |
238 | y0 = y; | |
239 | } else { | |
240 | y0 = 1.e10; | |
241 | } | |
e36044d6 | 242 | } |
95450c6d | 243 | |
244 | y = (pz < 0) ? -y0 : y0; | |
e36044d6 | 245 | |
246 | if (flag == 0) { | |
247 | // | |
248 | // Primary particle cuts | |
249 | // | |
250 | // transverse momentum cut | |
251 | if (pt > fPtMax || pt < fPtMin) { | |
252 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); | |
253 | return kFALSE; | |
254 | } | |
255 | // | |
256 | // momentum cut | |
257 | if (p > fPMax || p < fPMin) { | |
258 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
259 | return kFALSE; | |
260 | } | |
261 | // | |
262 | // theta cut | |
263 | if (theta > fThetaMax || theta < fThetaMin) { | |
264 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
265 | return kFALSE; | |
266 | } | |
267 | // | |
268 | // rapidity cut | |
269 | if (y > fYMax || y < fYMin) { | |
270 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); | |
271 | return kFALSE; | |
272 | } | |
273 | // | |
274 | // phi cut | |
275 | if (phi > fPhiMax || phi < fPhiMin) { | |
276 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); | |
277 | return kFALSE; | |
278 | } | |
279 | } else { | |
280 | // | |
281 | // Decay product cuts | |
282 | // | |
283 | // transverse momentum cut | |
284 | if (pt > fChildPtMax || pt < fChildPtMin) { | |
285 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); | |
286 | return kFALSE; | |
287 | } | |
288 | // | |
289 | // momentum cut | |
290 | if (p > fChildPMax || p < fChildPMin) { | |
291 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); | |
292 | return kFALSE; | |
293 | } | |
294 | // | |
295 | // theta cut | |
296 | if (theta > fChildThetaMax || theta < fChildThetaMin) { | |
297 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); | |
298 | return kFALSE; | |
299 | } | |
300 | // | |
301 | // rapidity cut | |
302 | if (y > fChildYMax || y < fChildYMin) { | |
303 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); | |
304 | return kFALSE; | |
305 | } | |
306 | // | |
307 | // phi cut | |
308 | if (phi > fChildPhiMax || phi < fChildPhiMin) { | |
309 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); | |
310 | return kFALSE; | |
311 | } | |
312 | } | |
313 | ||
e36044d6 | 314 | return kTRUE; |
315 | } | |
316 | ||
65de9f86 | 317 | Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) |
318 | { | |
e033748b | 319 | // Check the geometrical acceptance for particle. |
320 | ||
321 | Bool_t check ; | |
322 | Int_t numberOfPdgCodeParticleforAcceptanceCut = 0; | |
323 | Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0; | |
65de9f86 | 324 | TParticle * particle; |
325 | Int_t i; | |
e033748b | 326 | for (i = 0; i < np; i++) { |
65de9f86 | 327 | particle = (TParticle *) particles->At(i); |
328 | if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { | |
e033748b | 329 | numberOfPdgCodeParticleforAcceptanceCut++; |
330 | if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++; | |
65de9f86 | 331 | } |
332 | } | |
e033748b | 333 | if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) |
334 | check = kTRUE; | |
65de9f86 | 335 | else |
e033748b | 336 | check = kFALSE; |
65de9f86 | 337 | |
e033748b | 338 | return check; |
65de9f86 | 339 | } |
340 | ||
62d0ae06 | 341 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const |
e36044d6 | 342 | { |
343 | // | |
344 | // If the particle is in a diffractive state, then take action accordingly | |
345 | switch (pdgcode) { | |
346 | case 91: | |
347 | return 92; | |
348 | case 110: | |
349 | //rho_diff0 -- difficult to translate, return rho0 | |
350 | return 113; | |
351 | case 210: | |
352 | //pi_diffr+ -- change to pi+ | |
353 | return 211; | |
354 | case 220: | |
355 | //omega_di0 -- change to omega0 | |
356 | return 223; | |
357 | case 330: | |
358 | //phi_diff0 -- return phi0 | |
359 | return 333; | |
360 | case 440: | |
361 | //J/psi_di0 -- return J/psi | |
362 | return 443; | |
363 | case 2110: | |
364 | //n_diffr -- return neutron | |
365 | return 2112; | |
366 | case 2210: | |
367 | //p_diffr+ -- return proton | |
368 | return 2212; | |
369 | } | |
370 | //non diffractive state -- return code unchanged | |
371 | return pdgcode; | |
372 | } | |
3b945a60 | 373 | |
36d770d9 | 374 | void AliGenMC::Boost() |
3b945a60 | 375 | { |
376 | // | |
377 | // Boost cms into LHC lab frame | |
378 | // | |
379 | ||
36d770d9 | 380 | Double_t beta = TMath::TanH(fDyBoost); |
3b945a60 | 381 | Double_t gamma = 1./TMath::Sqrt(1.-beta*beta); |
382 | Double_t gb = gamma * beta; | |
383 | ||
7cdba479 | 384 | // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma); |
3b945a60 | 385 | |
386 | Int_t i; | |
387 | Int_t np = fParticles->GetEntriesFast(); | |
388 | for (i = 0; i < np; i++) | |
389 | { | |
390 | TParticle* iparticle = (TParticle*) fParticles->At(i); | |
391 | ||
392 | Double_t e = iparticle->Energy(); | |
393 | Double_t px = iparticle->Px(); | |
394 | Double_t py = iparticle->Py(); | |
395 | Double_t pz = iparticle->Pz(); | |
396 | ||
397 | Double_t eb = gamma * e - gb * pz; | |
398 | Double_t pzb = -gb * e + gamma * pz; | |
399 | ||
400 | iparticle->SetMomentum(px, py, pzb, eb); | |
401 | } | |
402 | } | |
403 | ||
404 | ||
e36044d6 | 405 | |
406 | AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) | |
407 | { | |
408 | // Assignment operator | |
198bb1c7 | 409 | rhs.Copy(*this); |
e36044d6 | 410 | return *this; |
411 | } | |
412 | ||
dc1d768c | 413 | void AliGenMC::Copy(TObject&) const |
198bb1c7 | 414 | { |
415 | // | |
416 | // Copy | |
417 | // | |
418 | Fatal("Copy","Not implemented!\n"); | |
419 | } | |
420 | ||
421 |