]>
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" |
ac3faee4 | 30 | #include "AliGeometry.h" |
116cbefd | 31 | |
198bb1c7 | 32 | ClassImp(AliGenMC) |
e36044d6 | 33 | |
34 | AliGenMC::AliGenMC() | |
198bb1c7 | 35 | :AliGenerator() |
e36044d6 | 36 | { |
37 | // Default Constructor | |
38 | SetCutOnChild(); | |
39 | SetChildMomentumRange(); | |
40 | SetChildPtRange(); | |
41 | SetChildPhiRange(); | |
42 | SetChildThetaRange(); | |
43 | SetChildYRange(); | |
47fc6bd5 | 44 | SetMaximumLifetime(); |
65de9f86 | 45 | SetGeometryAcceptance(); |
46 | SetPdgCodeParticleforAcceptanceCut(); | |
47 | SetNumberOfAcceptedParticles(); | |
3b945a60 | 48 | SetTarget(); |
49 | SetProjectile(); | |
e033748b | 50 | fParentSelect.Set(8); |
51 | fChildSelect.Set(8); | |
f0a0032d | 52 | fForceDecay = kAll; |
e36044d6 | 53 | } |
54 | ||
55 | AliGenMC::AliGenMC(Int_t npart) | |
198bb1c7 | 56 | :AliGenerator(npart) |
e36044d6 | 57 | { |
58 | // Constructor | |
59 | SetCutOnChild(); | |
60 | SetChildMomentumRange(); | |
61 | SetChildPtRange(); | |
62 | SetChildPhiRange(); | |
63 | SetChildThetaRange(); | |
64 | SetChildYRange(); | |
65 | // | |
66 | fParentSelect.Set(8); | |
67 | fChildSelect.Set(8); | |
68 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; | |
47fc6bd5 | 69 | SetMaximumLifetime(); |
65de9f86 | 70 | SetGeometryAcceptance(); |
71 | SetPdgCodeParticleforAcceptanceCut(); | |
72 | SetNumberOfAcceptedParticles(); | |
3b945a60 | 73 | SetTarget(); |
74 | SetProjectile(); | |
f0a0032d | 75 | fForceDecay = kAll; |
e36044d6 | 76 | } |
77 | ||
198bb1c7 | 78 | AliGenMC::AliGenMC(const AliGenMC & mc): |
79 | AliGenerator(mc) | |
e36044d6 | 80 | { |
198bb1c7 | 81 | // Copy constructor |
82 | mc.Copy(*this); | |
e36044d6 | 83 | } |
84 | ||
85 | AliGenMC::~AliGenMC() | |
86 | { | |
87 | // Destructor | |
88 | } | |
89 | ||
90 | void AliGenMC::Init() | |
91 | { | |
92 | // | |
93 | // Initialization | |
94 | switch (fForceDecay) { | |
95 | case kSemiElectronic: | |
96 | case kDiElectron: | |
97 | case kBJpsiDiElectron: | |
98 | case kBPsiPrimeDiElectron: | |
47fc6bd5 | 99 | fChildSelect[0] = kElectron; |
e36044d6 | 100 | break; |
2dcb5874 | 101 | case kHardMuons: |
e36044d6 | 102 | case kSemiMuonic: |
103 | case kDiMuon: | |
104 | case kBJpsiDiMuon: | |
105 | case kBPsiPrimeDiMuon: | |
106 | case kPiToMu: | |
107 | case kKaToMu: | |
108 | fChildSelect[0]=kMuonMinus; | |
109 | break; | |
110 | case kHadronicD: | |
111 | fChildSelect[0]=kPiPlus; | |
112 | fChildSelect[1]=kKPlus; | |
113 | break; | |
00cb2f27 | 114 | case kPhiKK: |
027677ae | 115 | fChildSelect[0]=kKPlus; |
56d47239 | 116 | break; |
117 | case kBJpsi: | |
118 | fChildSelect[0]=443; | |
119 | break; | |
62d0ae06 | 120 | case kOmega: |
e36044d6 | 121 | case kAll: |
122 | case kNoDecay: | |
d5f86442 | 123 | case kNoDecayHeavy: |
e36044d6 | 124 | break; |
125 | } | |
36d770d9 | 126 | |
127 | if (fZTarget != 0 && fAProjectile != 0) | |
128 | { | |
129 | fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) / | |
130 | (Double_t(fZTarget) * Double_t(fAProjectile))); | |
131 | } | |
e36044d6 | 132 | } |
133 | ||
134 | ||
62d0ae06 | 135 | Bool_t AliGenMC::ParentSelected(Int_t ip) const |
e36044d6 | 136 | { |
137 | // True if particle is in list of parent particles to be selected | |
138 | for (Int_t i=0; i<8; i++) | |
139 | { | |
62d0ae06 | 140 | if (fParentSelect.At(i) == ip) return kTRUE; |
e36044d6 | 141 | } |
142 | return kFALSE; | |
143 | } | |
144 | ||
62d0ae06 | 145 | Bool_t AliGenMC::ChildSelected(Int_t ip) const |
e36044d6 | 146 | { |
147 | // True if particle is in list of decay products to be selected | |
148 | for (Int_t i=0; i<5; i++) | |
149 | { | |
62d0ae06 | 150 | if (fChildSelect.At(i) == ip) return kTRUE; |
e36044d6 | 151 | } |
152 | return kFALSE; | |
153 | } | |
154 | ||
62d0ae06 | 155 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const |
e36044d6 | 156 | { |
157 | // Perform kinematic selection | |
e36044d6 | 158 | Float_t pz = particle->Pz(); |
159 | Float_t e = particle->Energy(); | |
160 | Float_t pt = particle->Pt(); | |
161 | Float_t p = particle->P(); | |
162 | Float_t theta = particle->Theta(); | |
cf01ee36 | 163 | Float_t mass = particle->GetCalcMass(); |
95450c6d | 164 | Float_t mt2 = pt * pt + mass * mass; |
0b6d2cb3 | 165 | Float_t phi = particle->Phi(); |
95450c6d | 166 | |
95450c6d | 167 | Double_t y, y0; |
168 | ||
fef61e14 | 169 | if (TMath::Abs(pz) < e) { |
95450c6d | 170 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
171 | } else { | |
172 | y = 1.e10; | |
173 | } | |
e36044d6 | 174 | |
95450c6d | 175 | if (mt2) { |
176 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); | |
e36044d6 | 177 | } else { |
95450c6d | 178 | if (TMath::Abs(y) < 1.e10) { |
179 | y0 = y; | |
180 | } else { | |
181 | y0 = 1.e10; | |
182 | } | |
e36044d6 | 183 | } |
95450c6d | 184 | |
185 | y = (pz < 0) ? -y0 : y0; | |
e36044d6 | 186 | |
187 | if (flag == 0) { | |
188 | // | |
189 | // Primary particle cuts | |
190 | // | |
191 | // transverse momentum cut | |
192 | if (pt > fPtMax || pt < fPtMin) { | |
193 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); | |
194 | return kFALSE; | |
195 | } | |
196 | // | |
197 | // momentum cut | |
198 | if (p > fPMax || p < fPMin) { | |
199 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
200 | return kFALSE; | |
201 | } | |
202 | // | |
203 | // theta cut | |
204 | if (theta > fThetaMax || theta < fThetaMin) { | |
205 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
206 | return kFALSE; | |
207 | } | |
208 | // | |
209 | // rapidity cut | |
210 | if (y > fYMax || y < fYMin) { | |
211 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); | |
212 | return kFALSE; | |
213 | } | |
214 | // | |
215 | // phi cut | |
216 | if (phi > fPhiMax || phi < fPhiMin) { | |
217 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); | |
218 | return kFALSE; | |
219 | } | |
220 | } else { | |
221 | // | |
222 | // Decay product cuts | |
223 | // | |
224 | // transverse momentum cut | |
225 | if (pt > fChildPtMax || pt < fChildPtMin) { | |
226 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); | |
227 | return kFALSE; | |
228 | } | |
229 | // | |
230 | // momentum cut | |
231 | if (p > fChildPMax || p < fChildPMin) { | |
232 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); | |
233 | return kFALSE; | |
234 | } | |
235 | // | |
236 | // theta cut | |
237 | if (theta > fChildThetaMax || theta < fChildThetaMin) { | |
238 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); | |
239 | return kFALSE; | |
240 | } | |
241 | // | |
242 | // rapidity cut | |
243 | if (y > fChildYMax || y < fChildYMin) { | |
244 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); | |
245 | return kFALSE; | |
246 | } | |
247 | // | |
248 | // phi cut | |
249 | if (phi > fChildPhiMax || phi < fChildPhiMin) { | |
250 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); | |
251 | return kFALSE; | |
252 | } | |
253 | } | |
254 | ||
e36044d6 | 255 | return kTRUE; |
256 | } | |
257 | ||
65de9f86 | 258 | Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) |
259 | { | |
e033748b | 260 | // Check the geometrical acceptance for particle. |
261 | ||
262 | Bool_t check ; | |
263 | Int_t numberOfPdgCodeParticleforAcceptanceCut = 0; | |
264 | Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0; | |
65de9f86 | 265 | TParticle * particle; |
266 | Int_t i; | |
e033748b | 267 | for (i = 0; i < np; i++) { |
65de9f86 | 268 | particle = (TParticle *) particles->At(i); |
269 | if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { | |
e033748b | 270 | numberOfPdgCodeParticleforAcceptanceCut++; |
271 | if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++; | |
65de9f86 | 272 | } |
273 | } | |
e033748b | 274 | if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) |
275 | check = kTRUE; | |
65de9f86 | 276 | else |
e033748b | 277 | check = kFALSE; |
65de9f86 | 278 | |
e033748b | 279 | return check; |
65de9f86 | 280 | } |
281 | ||
62d0ae06 | 282 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const |
e36044d6 | 283 | { |
284 | // | |
285 | // If the particle is in a diffractive state, then take action accordingly | |
286 | switch (pdgcode) { | |
287 | case 91: | |
288 | return 92; | |
289 | case 110: | |
290 | //rho_diff0 -- difficult to translate, return rho0 | |
291 | return 113; | |
292 | case 210: | |
293 | //pi_diffr+ -- change to pi+ | |
294 | return 211; | |
295 | case 220: | |
296 | //omega_di0 -- change to omega0 | |
297 | return 223; | |
298 | case 330: | |
299 | //phi_diff0 -- return phi0 | |
300 | return 333; | |
301 | case 440: | |
302 | //J/psi_di0 -- return J/psi | |
303 | return 443; | |
304 | case 2110: | |
305 | //n_diffr -- return neutron | |
306 | return 2112; | |
307 | case 2210: | |
308 | //p_diffr+ -- return proton | |
309 | return 2212; | |
310 | } | |
311 | //non diffractive state -- return code unchanged | |
312 | return pdgcode; | |
313 | } | |
3b945a60 | 314 | |
36d770d9 | 315 | void AliGenMC::Boost() |
3b945a60 | 316 | { |
317 | // | |
318 | // Boost cms into LHC lab frame | |
319 | // | |
320 | ||
36d770d9 | 321 | Double_t beta = TMath::TanH(fDyBoost); |
3b945a60 | 322 | Double_t gamma = 1./TMath::Sqrt(1.-beta*beta); |
323 | Double_t gb = gamma * beta; | |
324 | ||
7cdba479 | 325 | // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma); |
3b945a60 | 326 | |
327 | Int_t i; | |
328 | Int_t np = fParticles->GetEntriesFast(); | |
329 | for (i = 0; i < np; i++) | |
330 | { | |
331 | TParticle* iparticle = (TParticle*) fParticles->At(i); | |
332 | ||
333 | Double_t e = iparticle->Energy(); | |
334 | Double_t px = iparticle->Px(); | |
335 | Double_t py = iparticle->Py(); | |
336 | Double_t pz = iparticle->Pz(); | |
337 | ||
338 | Double_t eb = gamma * e - gb * pz; | |
339 | Double_t pzb = -gb * e + gamma * pz; | |
340 | ||
341 | iparticle->SetMomentum(px, py, pzb, eb); | |
342 | } | |
343 | } | |
344 | ||
345 | ||
e36044d6 | 346 | |
347 | AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) | |
348 | { | |
349 | // Assignment operator | |
198bb1c7 | 350 | rhs.Copy(*this); |
e36044d6 | 351 | return *this; |
352 | } | |
353 | ||
dc1d768c | 354 | void AliGenMC::Copy(TObject&) const |
198bb1c7 | 355 | { |
356 | // | |
357 | // Copy | |
358 | // | |
359 | Fatal("Copy","Not implemented!\n"); | |
360 | } | |
361 | ||
362 |