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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 | /* |
17 | $Log$ |
027677ae |
18 | Revision 1.10 2002/06/05 14:05:46 morsch |
19 | Decayer option kPhiKK for forced phi->K+K- decay added. |
20 | |
00cb2f27 |
21 | Revision 1.9 2002/05/30 14:58:29 morsch |
22 | Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez) |
23 | |
65de9f86 |
24 | Revision 1.8 2002/04/26 10:42:35 morsch |
25 | Case kNoDecayHeavy added. (N. Carrer) |
26 | |
d5f86442 |
27 | Revision 1.7 2002/04/17 10:32:32 morsch |
28 | Coding Rule violations corrected. |
29 | |
62d0ae06 |
30 | Revision 1.6 2002/03/26 14:19:36 morsch |
31 | Saver calculation of rapdity. |
32 | |
fef61e14 |
33 | Revision 1.5 2002/03/12 17:02:20 morsch |
34 | Change in calculation of rapidity, include case in which numerically e == pz. |
35 | |
95450c6d |
36 | Revision 1.4 2001/11/27 13:13:07 morsch |
37 | Maximum lifetime for long-lived particles to be put on the stack is parameter. |
38 | It can be set via SetMaximumLifetime(..). |
39 | |
47fc6bd5 |
40 | Revision 1.3 2001/10/16 08:48:56 morsch |
41 | Common vertex related code moved to base class AliGenerator. |
42 | |
b80a8e41 |
43 | Revision 1.2 2001/10/15 08:15:51 morsch |
44 | Event vertex and vertex truncation setting moved into AliMC. |
45 | |
dba8ac91 |
46 | Revision 1.1 2001/07/13 10:56:00 morsch |
47 | AliGenMC base class for AliGenParam and AliGenPythia commonalities. |
48 | |
e36044d6 |
49 | */ |
50 | |
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51 | // Base class for generators using external MC generators. |
52 | // For example AliGenPythia using Pythia. |
53 | // Provides basic functionality: setting of kinematic cuts on |
54 | // decay products and particle selection. |
55 | // andreas.morsch@cern.ch |
56 | |
e36044d6 |
57 | #include "AliGenMC.h" |
58 | #include "AliPDG.h" |
65de9f86 |
59 | #include <TMath.h> |
e36044d6 |
60 | #include <TParticle.h> |
61 | |
62 | ClassImp(AliGenMC) |
63 | |
64 | AliGenMC::AliGenMC() |
65 | :AliGenerator() |
66 | { |
67 | // Default Constructor |
68 | SetCutOnChild(); |
69 | SetChildMomentumRange(); |
70 | SetChildPtRange(); |
71 | SetChildPhiRange(); |
72 | SetChildThetaRange(); |
73 | SetChildYRange(); |
47fc6bd5 |
74 | SetMaximumLifetime(); |
65de9f86 |
75 | SetGeometryAcceptance(); |
76 | SetPdgCodeParticleforAcceptanceCut(); |
77 | SetNumberOfAcceptedParticles(); |
e36044d6 |
78 | } |
79 | |
80 | AliGenMC::AliGenMC(Int_t npart) |
81 | :AliGenerator(npart) |
82 | { |
83 | // Constructor |
84 | SetCutOnChild(); |
85 | SetChildMomentumRange(); |
86 | SetChildPtRange(); |
87 | SetChildPhiRange(); |
88 | SetChildThetaRange(); |
89 | SetChildYRange(); |
90 | // |
91 | fParentSelect.Set(8); |
92 | fChildSelect.Set(8); |
93 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; |
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94 | SetMaximumLifetime(); |
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95 | SetGeometryAcceptance(); |
96 | SetPdgCodeParticleforAcceptanceCut(); |
97 | SetNumberOfAcceptedParticles(); |
e36044d6 |
98 | } |
99 | |
100 | AliGenMC::AliGenMC(const AliGenMC & mc) |
101 | { |
102 | // copy constructor |
103 | } |
104 | |
105 | AliGenMC::~AliGenMC() |
106 | { |
107 | // Destructor |
108 | } |
109 | |
110 | void AliGenMC::Init() |
111 | { |
112 | // |
113 | // Initialization |
114 | switch (fForceDecay) { |
115 | case kSemiElectronic: |
116 | case kDiElectron: |
117 | case kBJpsiDiElectron: |
118 | case kBPsiPrimeDiElectron: |
47fc6bd5 |
119 | fChildSelect[0] = kElectron; |
e36044d6 |
120 | break; |
121 | case kSemiMuonic: |
122 | case kDiMuon: |
123 | case kBJpsiDiMuon: |
124 | case kBPsiPrimeDiMuon: |
125 | case kPiToMu: |
126 | case kKaToMu: |
127 | fChildSelect[0]=kMuonMinus; |
128 | break; |
129 | case kHadronicD: |
130 | fChildSelect[0]=kPiPlus; |
131 | fChildSelect[1]=kKPlus; |
132 | break; |
00cb2f27 |
133 | case kPhiKK: |
027677ae |
134 | fChildSelect[0]=kKPlus; |
62d0ae06 |
135 | case kOmega: |
e36044d6 |
136 | case kAll: |
137 | case kNoDecay: |
d5f86442 |
138 | case kNoDecayHeavy: |
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139 | break; |
140 | } |
141 | } |
142 | |
143 | |
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144 | Bool_t AliGenMC::ParentSelected(Int_t ip) const |
e36044d6 |
145 | { |
146 | // True if particle is in list of parent particles to be selected |
147 | for (Int_t i=0; i<8; i++) |
148 | { |
62d0ae06 |
149 | if (fParentSelect.At(i) == ip) return kTRUE; |
e36044d6 |
150 | } |
151 | return kFALSE; |
152 | } |
153 | |
62d0ae06 |
154 | Bool_t AliGenMC::ChildSelected(Int_t ip) const |
e36044d6 |
155 | { |
156 | // True if particle is in list of decay products to be selected |
157 | for (Int_t i=0; i<5; i++) |
158 | { |
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159 | if (fChildSelect.At(i) == ip) return kTRUE; |
e36044d6 |
160 | } |
161 | return kFALSE; |
162 | } |
163 | |
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164 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const |
e36044d6 |
165 | { |
166 | // Perform kinematic selection |
167 | Float_t px = particle->Px(); |
168 | Float_t py = particle->Py(); |
169 | Float_t pz = particle->Pz(); |
170 | Float_t e = particle->Energy(); |
171 | Float_t pt = particle->Pt(); |
172 | Float_t p = particle->P(); |
173 | Float_t theta = particle->Theta(); |
95450c6d |
174 | Float_t mass = particle->GetMass(); |
175 | Float_t mt2 = pt * pt + mass * mass; |
176 | |
e36044d6 |
177 | Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px))); |
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178 | Double_t y, y0; |
179 | |
fef61e14 |
180 | if (TMath::Abs(pz) < e) { |
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181 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
182 | } else { |
183 | y = 1.e10; |
184 | } |
e36044d6 |
185 | |
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186 | if (mt2) { |
187 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); |
e36044d6 |
188 | } else { |
95450c6d |
189 | if (TMath::Abs(y) < 1.e10) { |
190 | y0 = y; |
191 | } else { |
192 | y0 = 1.e10; |
193 | } |
e36044d6 |
194 | } |
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195 | |
196 | y = (pz < 0) ? -y0 : y0; |
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197 | |
198 | if (flag == 0) { |
199 | // |
200 | // Primary particle cuts |
201 | // |
202 | // transverse momentum cut |
203 | if (pt > fPtMax || pt < fPtMin) { |
204 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); |
205 | return kFALSE; |
206 | } |
207 | // |
208 | // momentum cut |
209 | if (p > fPMax || p < fPMin) { |
210 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); |
211 | return kFALSE; |
212 | } |
213 | // |
214 | // theta cut |
215 | if (theta > fThetaMax || theta < fThetaMin) { |
216 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); |
217 | return kFALSE; |
218 | } |
219 | // |
220 | // rapidity cut |
221 | if (y > fYMax || y < fYMin) { |
222 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); |
223 | return kFALSE; |
224 | } |
225 | // |
226 | // phi cut |
227 | if (phi > fPhiMax || phi < fPhiMin) { |
228 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); |
229 | return kFALSE; |
230 | } |
231 | } else { |
232 | // |
233 | // Decay product cuts |
234 | // |
235 | // transverse momentum cut |
236 | if (pt > fChildPtMax || pt < fChildPtMin) { |
237 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); |
238 | return kFALSE; |
239 | } |
240 | // |
241 | // momentum cut |
242 | if (p > fChildPMax || p < fChildPMin) { |
243 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); |
244 | return kFALSE; |
245 | } |
246 | // |
247 | // theta cut |
248 | if (theta > fChildThetaMax || theta < fChildThetaMin) { |
249 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); |
250 | return kFALSE; |
251 | } |
252 | // |
253 | // rapidity cut |
254 | if (y > fChildYMax || y < fChildYMin) { |
255 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); |
256 | return kFALSE; |
257 | } |
258 | // |
259 | // phi cut |
260 | if (phi > fChildPhiMax || phi < fChildPhiMin) { |
261 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); |
262 | return kFALSE; |
263 | } |
264 | } |
265 | |
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266 | return kTRUE; |
267 | } |
268 | |
65de9f86 |
269 | Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) |
270 | { |
271 | Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance |
272 | Int_t NumberOfPdgCodeParticleforAcceptanceCut=0; |
273 | Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0; |
274 | TParticle * particle; |
275 | Int_t i; |
276 | for (i=0; i<np; i++) { |
277 | particle = (TParticle *) particles->At(i); |
278 | if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { |
279 | NumberOfPdgCodeParticleforAcceptanceCut++; |
280 | if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++; |
281 | } |
282 | } |
283 | if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) |
284 | Check = kTRUE; |
285 | else |
286 | Check = kFALSE; |
287 | |
288 | return Check; |
289 | } |
290 | |
62d0ae06 |
291 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const |
e36044d6 |
292 | { |
293 | // |
294 | // If the particle is in a diffractive state, then take action accordingly |
295 | switch (pdgcode) { |
296 | case 91: |
297 | return 92; |
298 | case 110: |
299 | //rho_diff0 -- difficult to translate, return rho0 |
300 | return 113; |
301 | case 210: |
302 | //pi_diffr+ -- change to pi+ |
303 | return 211; |
304 | case 220: |
305 | //omega_di0 -- change to omega0 |
306 | return 223; |
307 | case 330: |
308 | //phi_diff0 -- return phi0 |
309 | return 333; |
310 | case 440: |
311 | //J/psi_di0 -- return J/psi |
312 | return 443; |
313 | case 2110: |
314 | //n_diffr -- return neutron |
315 | return 2112; |
316 | case 2210: |
317 | //p_diffr+ -- return proton |
318 | return 2212; |
319 | } |
320 | //non diffractive state -- return code unchanged |
321 | return pdgcode; |
322 | } |
323 | |
324 | AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) |
325 | { |
326 | // Assignment operator |
327 | return *this; |
328 | } |
329 | |