]>
Commit | Line | Data |
---|---|---|
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" |
d97fb2bb | 30 | #include "AliRun.h" |
ac3faee4 | 31 | #include "AliGeometry.h" |
116cbefd | 32 | |
198bb1c7 | 33 | ClassImp(AliGenMC) |
e36044d6 | 34 | |
35 | AliGenMC::AliGenMC() | |
1c56e311 | 36 | :AliGenerator(), |
37 | fParticles(0), | |
38 | fParentSelect(8), | |
39 | fChildSelect(8), | |
40 | fCutOnChild(0), | |
41 | fChildPtMin(0.), | |
42 | fChildPtMax(1.e10), | |
43 | fChildPMin(0.), | |
44 | fChildPMax(1.e10), | |
45 | fChildPhiMin(0.), | |
46 | fChildPhiMax(2. * TMath::Pi()), | |
47 | fChildThetaMin(0.), | |
48 | fChildThetaMax(TMath::Pi()), | |
49 | fChildYMin(-12.), | |
50 | fChildYMax(12.), | |
51 | fXingAngleX(0.), | |
52 | fXingAngleY(0.), | |
53 | fForceDecay(kAll), | |
54 | fMaxLifeTime(1.e-15), | |
55 | fAProjectile(1), | |
56 | fZProjectile(1), | |
57 | fATarget(1), | |
58 | fZTarget(1), | |
59 | fProjectile("P"), | |
60 | fTarget("P"), | |
61 | fDyBoost(0.), | |
62 | fGeometryAcceptance(0), | |
63 | fPdgCodeParticleforAcceptanceCut(0), | |
d97fb2bb | 64 | fNumberOfAcceptedParticles(0), |
65 | fNprimaries(0) | |
e36044d6 | 66 | { |
67 | // Default Constructor | |
e36044d6 | 68 | } |
69 | ||
70 | AliGenMC::AliGenMC(Int_t npart) | |
1c56e311 | 71 | :AliGenerator(npart), |
72 | fParticles(0), | |
73 | fParentSelect(8), | |
74 | fChildSelect(8), | |
75 | fCutOnChild(0), | |
76 | fChildPtMin(0.), | |
77 | fChildPtMax(1.e10), | |
78 | fChildPMin(0.), | |
79 | fChildPMax(1.e10), | |
80 | fChildPhiMin(0.), | |
81 | fChildPhiMax(2. * TMath::Pi()), | |
82 | fChildThetaMin(0.), | |
83 | fChildThetaMax(TMath::Pi()), | |
84 | fChildYMin(-12.), | |
85 | fChildYMax(12.), | |
86 | fXingAngleX(0.), | |
87 | fXingAngleY(0.), | |
88 | fForceDecay(kAll), | |
89 | fMaxLifeTime(1.e-15), | |
90 | fAProjectile(1), | |
91 | fZProjectile(1), | |
92 | fATarget(1), | |
93 | fZTarget(1), | |
94 | fProjectile("P"), | |
95 | fTarget("P"), | |
96 | fDyBoost(0.), | |
97 | fGeometryAcceptance(0), | |
98 | fPdgCodeParticleforAcceptanceCut(0), | |
d97fb2bb | 99 | fNumberOfAcceptedParticles(0), |
100 | fNprimaries(0) | |
e36044d6 | 101 | { |
102 | // Constructor | |
e36044d6 | 103 | // |
e36044d6 | 104 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; |
105 | } | |
106 | ||
e36044d6 | 107 | AliGenMC::~AliGenMC() |
108 | { | |
109 | // Destructor | |
110 | } | |
111 | ||
112 | void AliGenMC::Init() | |
113 | { | |
114 | // | |
115 | // Initialization | |
116 | switch (fForceDecay) { | |
e345c619 | 117 | case kBSemiElectronic: |
e36044d6 | 118 | case kSemiElectronic: |
119 | case kDiElectron: | |
120 | case kBJpsiDiElectron: | |
121 | case kBPsiPrimeDiElectron: | |
47fc6bd5 | 122 | fChildSelect[0] = kElectron; |
e36044d6 | 123 | break; |
2dcb5874 | 124 | case kHardMuons: |
e345c619 | 125 | case kBSemiMuonic: |
e36044d6 | 126 | case kSemiMuonic: |
127 | case kDiMuon: | |
128 | case kBJpsiDiMuon: | |
129 | case kBPsiPrimeDiMuon: | |
130 | case kPiToMu: | |
131 | case kKaToMu: | |
cd159249 | 132 | case kWToMuon: |
133 | case kWToCharmToMuon: | |
2f299526 | 134 | case kZDiMuon: |
f5b581a1 | 135 | case kZDiElectron: |
e36044d6 | 136 | fChildSelect[0]=kMuonMinus; |
137 | break; | |
cd159249 | 138 | case kWToCharm: |
139 | break; | |
e36044d6 | 140 | case kHadronicD: |
af33df34 | 141 | case kHadronicDWithout4Bodies: |
e36044d6 | 142 | fChildSelect[0]=kPiPlus; |
143 | fChildSelect[1]=kKPlus; | |
144 | break; | |
00cb2f27 | 145 | case kPhiKK: |
027677ae | 146 | fChildSelect[0]=kKPlus; |
56d47239 | 147 | break; |
148 | case kBJpsi: | |
149 | fChildSelect[0]=443; | |
150 | break; | |
62d0ae06 | 151 | case kOmega: |
e36044d6 | 152 | case kAll: |
2b1f8257 | 153 | case kAllMuonic: |
e36044d6 | 154 | case kNoDecay: |
d5f86442 | 155 | case kNoDecayHeavy: |
847af604 | 156 | case kNeutralPion: |
e36044d6 | 157 | break; |
158 | } | |
36d770d9 | 159 | |
160 | if (fZTarget != 0 && fAProjectile != 0) | |
161 | { | |
162 | fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) / | |
163 | (Double_t(fZTarget) * Double_t(fAProjectile))); | |
164 | } | |
e36044d6 | 165 | } |
166 | ||
167 | ||
62d0ae06 | 168 | Bool_t AliGenMC::ParentSelected(Int_t ip) const |
e36044d6 | 169 | { |
170 | // True if particle is in list of parent particles to be selected | |
171 | for (Int_t i=0; i<8; i++) | |
172 | { | |
62d0ae06 | 173 | if (fParentSelect.At(i) == ip) return kTRUE; |
e36044d6 | 174 | } |
175 | return kFALSE; | |
176 | } | |
177 | ||
62d0ae06 | 178 | Bool_t AliGenMC::ChildSelected(Int_t ip) const |
e36044d6 | 179 | { |
180 | // True if particle is in list of decay products to be selected | |
181 | for (Int_t i=0; i<5; i++) | |
182 | { | |
62d0ae06 | 183 | if (fChildSelect.At(i) == ip) return kTRUE; |
e36044d6 | 184 | } |
185 | return kFALSE; | |
186 | } | |
187 | ||
62d0ae06 | 188 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const |
e36044d6 | 189 | { |
190 | // Perform kinematic selection | |
e36044d6 | 191 | Float_t pz = particle->Pz(); |
192 | Float_t e = particle->Energy(); | |
193 | Float_t pt = particle->Pt(); | |
194 | Float_t p = particle->P(); | |
195 | Float_t theta = particle->Theta(); | |
cf01ee36 | 196 | Float_t mass = particle->GetCalcMass(); |
95450c6d | 197 | Float_t mt2 = pt * pt + mass * mass; |
0b6d2cb3 | 198 | Float_t phi = particle->Phi(); |
95450c6d | 199 | |
95450c6d | 200 | Double_t y, y0; |
201 | ||
fef61e14 | 202 | if (TMath::Abs(pz) < e) { |
95450c6d | 203 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
204 | } else { | |
205 | y = 1.e10; | |
206 | } | |
e36044d6 | 207 | |
95450c6d | 208 | if (mt2) { |
209 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); | |
e36044d6 | 210 | } else { |
95450c6d | 211 | if (TMath::Abs(y) < 1.e10) { |
212 | y0 = y; | |
213 | } else { | |
214 | y0 = 1.e10; | |
215 | } | |
e36044d6 | 216 | } |
95450c6d | 217 | |
218 | y = (pz < 0) ? -y0 : y0; | |
e36044d6 | 219 | |
220 | if (flag == 0) { | |
221 | // | |
222 | // Primary particle cuts | |
223 | // | |
224 | // transverse momentum cut | |
225 | if (pt > fPtMax || pt < fPtMin) { | |
226 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); | |
227 | return kFALSE; | |
228 | } | |
229 | // | |
230 | // momentum cut | |
231 | if (p > fPMax || p < fPMin) { | |
232 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
233 | return kFALSE; | |
234 | } | |
235 | // | |
236 | // theta cut | |
237 | if (theta > fThetaMax || theta < fThetaMin) { | |
238 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
239 | return kFALSE; | |
240 | } | |
241 | // | |
242 | // rapidity cut | |
243 | if (y > fYMax || y < fYMin) { | |
244 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); | |
245 | return kFALSE; | |
246 | } | |
247 | // | |
248 | // phi cut | |
249 | if (phi > fPhiMax || phi < fPhiMin) { | |
250 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); | |
251 | return kFALSE; | |
252 | } | |
253 | } else { | |
254 | // | |
255 | // Decay product cuts | |
256 | // | |
257 | // transverse momentum cut | |
258 | if (pt > fChildPtMax || pt < fChildPtMin) { | |
259 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); | |
260 | return kFALSE; | |
261 | } | |
262 | // | |
263 | // momentum cut | |
264 | if (p > fChildPMax || p < fChildPMin) { | |
265 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); | |
266 | return kFALSE; | |
267 | } | |
268 | // | |
269 | // theta cut | |
270 | if (theta > fChildThetaMax || theta < fChildThetaMin) { | |
271 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); | |
272 | return kFALSE; | |
273 | } | |
274 | // | |
275 | // rapidity cut | |
276 | if (y > fChildYMax || y < fChildYMin) { | |
277 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); | |
278 | return kFALSE; | |
279 | } | |
280 | // | |
281 | // phi cut | |
282 | if (phi > fChildPhiMax || phi < fChildPhiMin) { | |
283 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); | |
284 | return kFALSE; | |
285 | } | |
286 | } | |
287 | ||
e36044d6 | 288 | return kTRUE; |
289 | } | |
290 | ||
65de9f86 | 291 | Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) |
292 | { | |
e033748b | 293 | // Check the geometrical acceptance for particle. |
294 | ||
295 | Bool_t check ; | |
296 | Int_t numberOfPdgCodeParticleforAcceptanceCut = 0; | |
297 | Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0; | |
65de9f86 | 298 | TParticle * particle; |
299 | Int_t i; | |
e033748b | 300 | for (i = 0; i < np; i++) { |
65de9f86 | 301 | particle = (TParticle *) particles->At(i); |
302 | if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { | |
e033748b | 303 | numberOfPdgCodeParticleforAcceptanceCut++; |
304 | if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++; | |
65de9f86 | 305 | } |
306 | } | |
e033748b | 307 | if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) |
308 | check = kTRUE; | |
65de9f86 | 309 | else |
e033748b | 310 | check = kFALSE; |
65de9f86 | 311 | |
e033748b | 312 | return check; |
65de9f86 | 313 | } |
314 | ||
62d0ae06 | 315 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const |
e36044d6 | 316 | { |
317 | // | |
318 | // If the particle is in a diffractive state, then take action accordingly | |
319 | switch (pdgcode) { | |
320 | case 91: | |
321 | return 92; | |
322 | case 110: | |
323 | //rho_diff0 -- difficult to translate, return rho0 | |
324 | return 113; | |
325 | case 210: | |
326 | //pi_diffr+ -- change to pi+ | |
327 | return 211; | |
328 | case 220: | |
329 | //omega_di0 -- change to omega0 | |
330 | return 223; | |
331 | case 330: | |
332 | //phi_diff0 -- return phi0 | |
333 | return 333; | |
334 | case 440: | |
335 | //J/psi_di0 -- return J/psi | |
336 | return 443; | |
337 | case 2110: | |
338 | //n_diffr -- return neutron | |
339 | return 2112; | |
340 | case 2210: | |
341 | //p_diffr+ -- return proton | |
342 | return 2212; | |
343 | } | |
344 | //non diffractive state -- return code unchanged | |
345 | return pdgcode; | |
346 | } | |
3b945a60 | 347 | |
36d770d9 | 348 | void AliGenMC::Boost() |
3b945a60 | 349 | { |
350 | // | |
351 | // Boost cms into LHC lab frame | |
352 | // | |
353 | ||
36d770d9 | 354 | Double_t beta = TMath::TanH(fDyBoost); |
3b945a60 | 355 | Double_t gamma = 1./TMath::Sqrt(1.-beta*beta); |
356 | Double_t gb = gamma * beta; | |
357 | ||
7cdba479 | 358 | // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma); |
3b945a60 | 359 | |
360 | Int_t i; | |
361 | Int_t np = fParticles->GetEntriesFast(); | |
362 | for (i = 0; i < np; i++) | |
363 | { | |
364 | TParticle* iparticle = (TParticle*) fParticles->At(i); | |
365 | ||
366 | Double_t e = iparticle->Energy(); | |
367 | Double_t px = iparticle->Px(); | |
368 | Double_t py = iparticle->Py(); | |
369 | Double_t pz = iparticle->Pz(); | |
370 | ||
371 | Double_t eb = gamma * e - gb * pz; | |
372 | Double_t pzb = -gb * e + gamma * pz; | |
373 | ||
374 | iparticle->SetMomentum(px, py, pzb, eb); | |
375 | } | |
376 | } | |
d97fb2bb | 377 | |
378 | void AliGenMC::AddHeader(AliGenEventHeader* header) | |
379 | { | |
380 | // Passes header either to the container or to gAlice | |
381 | if (fContainer) { | |
382 | fContainer->AddHeader(header); | |
383 | } else { | |
384 | gAlice->SetGenEventHeader(header); | |
385 | } | |
386 | } |