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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 | // 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 | ||
24 | #include <TMath.h> | |
25 | #include <TPDGCode.h> | |
26 | #include <TParticle.h> | |
27 | ||
28 | #include "AliGenMC.h" | |
29 | ||
30 | ClassImp(AliGenMC) | |
31 | ||
32 | AliGenMC::AliGenMC() | |
33 | :AliGenerator() | |
34 | { | |
35 | // Default Constructor | |
36 | SetCutOnChild(); | |
37 | SetChildMomentumRange(); | |
38 | SetChildPtRange(); | |
39 | SetChildPhiRange(); | |
40 | SetChildThetaRange(); | |
41 | SetChildYRange(); | |
42 | SetMaximumLifetime(); | |
43 | SetGeometryAcceptance(); | |
44 | SetPdgCodeParticleforAcceptanceCut(); | |
45 | SetNumberOfAcceptedParticles(); | |
46 | SetTarget(); | |
47 | SetProjectile(); | |
48 | } | |
49 | ||
50 | AliGenMC::AliGenMC(Int_t npart) | |
51 | :AliGenerator(npart) | |
52 | { | |
53 | // Constructor | |
54 | SetCutOnChild(); | |
55 | SetChildMomentumRange(); | |
56 | SetChildPtRange(); | |
57 | SetChildPhiRange(); | |
58 | SetChildThetaRange(); | |
59 | SetChildYRange(); | |
60 | // | |
61 | fParentSelect.Set(8); | |
62 | fChildSelect.Set(8); | |
63 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; | |
64 | SetMaximumLifetime(); | |
65 | SetGeometryAcceptance(); | |
66 | SetPdgCodeParticleforAcceptanceCut(); | |
67 | SetNumberOfAcceptedParticles(); | |
68 | SetTarget(); | |
69 | SetProjectile(); | |
70 | } | |
71 | ||
72 | AliGenMC::AliGenMC(const AliGenMC & mc): | |
73 | AliGenerator(mc) | |
74 | { | |
75 | // Copy constructor | |
76 | mc.Copy(*this); | |
77 | } | |
78 | ||
79 | AliGenMC::~AliGenMC() | |
80 | { | |
81 | // Destructor | |
82 | } | |
83 | ||
84 | void AliGenMC::Init() | |
85 | { | |
86 | // | |
87 | // Initialization | |
88 | switch (fForceDecay) { | |
89 | case kSemiElectronic: | |
90 | case kDiElectron: | |
91 | case kBJpsiDiElectron: | |
92 | case kBPsiPrimeDiElectron: | |
93 | fChildSelect[0] = kElectron; | |
94 | break; | |
95 | case kHardMuons: | |
96 | case kSemiMuonic: | |
97 | case kDiMuon: | |
98 | case kBJpsiDiMuon: | |
99 | case kBPsiPrimeDiMuon: | |
100 | case kPiToMu: | |
101 | case kKaToMu: | |
102 | fChildSelect[0]=kMuonMinus; | |
103 | break; | |
104 | case kHadronicD: | |
105 | fChildSelect[0]=kPiPlus; | |
106 | fChildSelect[1]=kKPlus; | |
107 | break; | |
108 | case kPhiKK: | |
109 | fChildSelect[0]=kKPlus; | |
110 | case kOmega: | |
111 | case kAll: | |
112 | case kNoDecay: | |
113 | case kNoDecayHeavy: | |
114 | break; | |
115 | } | |
116 | ||
117 | if (fZTarget != 0 && fAProjectile != 0) | |
118 | { | |
119 | fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) / | |
120 | (Double_t(fZTarget) * Double_t(fAProjectile))); | |
121 | } | |
122 | } | |
123 | ||
124 | ||
125 | Bool_t AliGenMC::ParentSelected(Int_t ip) const | |
126 | { | |
127 | // True if particle is in list of parent particles to be selected | |
128 | for (Int_t i=0; i<8; i++) | |
129 | { | |
130 | if (fParentSelect.At(i) == ip) return kTRUE; | |
131 | } | |
132 | return kFALSE; | |
133 | } | |
134 | ||
135 | Bool_t AliGenMC::ChildSelected(Int_t ip) const | |
136 | { | |
137 | // True if particle is in list of decay products to be selected | |
138 | for (Int_t i=0; i<5; i++) | |
139 | { | |
140 | if (fChildSelect.At(i) == ip) return kTRUE; | |
141 | } | |
142 | return kFALSE; | |
143 | } | |
144 | ||
145 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const | |
146 | { | |
147 | // Perform kinematic selection | |
148 | Float_t pz = particle->Pz(); | |
149 | Float_t e = particle->Energy(); | |
150 | Float_t pt = particle->Pt(); | |
151 | Float_t p = particle->P(); | |
152 | Float_t theta = particle->Theta(); | |
153 | Float_t mass = particle->GetCalcMass(); | |
154 | Float_t mt2 = pt * pt + mass * mass; | |
155 | Float_t phi = particle->Phi(); | |
156 | ||
157 | Double_t y, y0; | |
158 | ||
159 | if (TMath::Abs(pz) < e) { | |
160 | y = 0.5*TMath::Log((e+pz)/(e-pz)); | |
161 | } else { | |
162 | y = 1.e10; | |
163 | } | |
164 | ||
165 | if (mt2) { | |
166 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); | |
167 | } else { | |
168 | if (TMath::Abs(y) < 1.e10) { | |
169 | y0 = y; | |
170 | } else { | |
171 | y0 = 1.e10; | |
172 | } | |
173 | } | |
174 | ||
175 | y = (pz < 0) ? -y0 : y0; | |
176 | ||
177 | if (flag == 0) { | |
178 | // | |
179 | // Primary particle cuts | |
180 | // | |
181 | // transverse momentum cut | |
182 | if (pt > fPtMax || pt < fPtMin) { | |
183 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); | |
184 | return kFALSE; | |
185 | } | |
186 | // | |
187 | // momentum cut | |
188 | if (p > fPMax || p < fPMin) { | |
189 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
190 | return kFALSE; | |
191 | } | |
192 | // | |
193 | // theta cut | |
194 | if (theta > fThetaMax || theta < fThetaMin) { | |
195 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
196 | return kFALSE; | |
197 | } | |
198 | // | |
199 | // rapidity cut | |
200 | if (y > fYMax || y < fYMin) { | |
201 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); | |
202 | return kFALSE; | |
203 | } | |
204 | // | |
205 | // phi cut | |
206 | if (phi > fPhiMax || phi < fPhiMin) { | |
207 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); | |
208 | return kFALSE; | |
209 | } | |
210 | } else { | |
211 | // | |
212 | // Decay product cuts | |
213 | // | |
214 | // transverse momentum cut | |
215 | if (pt > fChildPtMax || pt < fChildPtMin) { | |
216 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); | |
217 | return kFALSE; | |
218 | } | |
219 | // | |
220 | // momentum cut | |
221 | if (p > fChildPMax || p < fChildPMin) { | |
222 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); | |
223 | return kFALSE; | |
224 | } | |
225 | // | |
226 | // theta cut | |
227 | if (theta > fChildThetaMax || theta < fChildThetaMin) { | |
228 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); | |
229 | return kFALSE; | |
230 | } | |
231 | // | |
232 | // rapidity cut | |
233 | if (y > fChildYMax || y < fChildYMin) { | |
234 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); | |
235 | return kFALSE; | |
236 | } | |
237 | // | |
238 | // phi cut | |
239 | if (phi > fChildPhiMax || phi < fChildPhiMin) { | |
240 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); | |
241 | return kFALSE; | |
242 | } | |
243 | } | |
244 | ||
245 | return kTRUE; | |
246 | } | |
247 | ||
248 | Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) | |
249 | { | |
250 | Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance | |
251 | Int_t NumberOfPdgCodeParticleforAcceptanceCut=0; | |
252 | Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0; | |
253 | TParticle * particle; | |
254 | Int_t i; | |
255 | for (i=0; i<np; i++) { | |
256 | particle = (TParticle *) particles->At(i); | |
257 | if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { | |
258 | NumberOfPdgCodeParticleforAcceptanceCut++; | |
259 | if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++; | |
260 | } | |
261 | } | |
262 | if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) | |
263 | Check = kTRUE; | |
264 | else | |
265 | Check = kFALSE; | |
266 | ||
267 | return Check; | |
268 | } | |
269 | ||
270 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const | |
271 | { | |
272 | // | |
273 | // If the particle is in a diffractive state, then take action accordingly | |
274 | switch (pdgcode) { | |
275 | case 91: | |
276 | return 92; | |
277 | case 110: | |
278 | //rho_diff0 -- difficult to translate, return rho0 | |
279 | return 113; | |
280 | case 210: | |
281 | //pi_diffr+ -- change to pi+ | |
282 | return 211; | |
283 | case 220: | |
284 | //omega_di0 -- change to omega0 | |
285 | return 223; | |
286 | case 330: | |
287 | //phi_diff0 -- return phi0 | |
288 | return 333; | |
289 | case 440: | |
290 | //J/psi_di0 -- return J/psi | |
291 | return 443; | |
292 | case 2110: | |
293 | //n_diffr -- return neutron | |
294 | return 2112; | |
295 | case 2210: | |
296 | //p_diffr+ -- return proton | |
297 | return 2212; | |
298 | } | |
299 | //non diffractive state -- return code unchanged | |
300 | return pdgcode; | |
301 | } | |
302 | ||
303 | void AliGenMC::Boost() | |
304 | { | |
305 | // | |
306 | // Boost cms into LHC lab frame | |
307 | // | |
308 | ||
309 | Double_t beta = TMath::TanH(fDyBoost); | |
310 | Double_t gamma = 1./TMath::Sqrt(1.-beta*beta); | |
311 | Double_t gb = gamma * beta; | |
312 | ||
313 | // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma); | |
314 | ||
315 | Int_t i; | |
316 | Int_t np = fParticles->GetEntriesFast(); | |
317 | for (i = 0; i < np; i++) | |
318 | { | |
319 | TParticle* iparticle = (TParticle*) fParticles->At(i); | |
320 | ||
321 | Double_t e = iparticle->Energy(); | |
322 | Double_t px = iparticle->Px(); | |
323 | Double_t py = iparticle->Py(); | |
324 | Double_t pz = iparticle->Pz(); | |
325 | ||
326 | Double_t eb = gamma * e - gb * pz; | |
327 | Double_t pzb = -gb * e + gamma * pz; | |
328 | ||
329 | iparticle->SetMomentum(px, py, pzb, eb); | |
330 | } | |
331 | } | |
332 | ||
333 | ||
334 | ||
335 | AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) | |
336 | { | |
337 | // Assignment operator | |
338 | rhs.Copy(*this); | |
339 | return *this; | |
340 | } | |
341 | ||
342 | void AliGenMC::Copy(AliGenMC&) const | |
343 | { | |
344 | // | |
345 | // Copy | |
346 | // | |
347 | Fatal("Copy","Not implemented!\n"); | |
348 | } | |
349 | ||
350 |