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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 | $Log$ |
cf01ee36 |
18 | Revision 1.11 2002/06/06 15:26:24 morsch |
19 | Correct child-selection for kPhiKK |
20 | |
027677ae |
21 | Revision 1.10 2002/06/05 14:05:46 morsch |
22 | Decayer option kPhiKK for forced phi->K+K- decay added. |
23 | |
00cb2f27 |
24 | Revision 1.9 2002/05/30 14:58:29 morsch |
25 | Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez) |
26 | |
65de9f86 |
27 | Revision 1.8 2002/04/26 10:42:35 morsch |
28 | Case kNoDecayHeavy added. (N. Carrer) |
29 | |
d5f86442 |
30 | Revision 1.7 2002/04/17 10:32:32 morsch |
31 | Coding Rule violations corrected. |
32 | |
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33 | Revision 1.6 2002/03/26 14:19:36 morsch |
34 | Saver calculation of rapdity. |
35 | |
fef61e14 |
36 | Revision 1.5 2002/03/12 17:02:20 morsch |
37 | Change in calculation of rapidity, include case in which numerically e == pz. |
38 | |
95450c6d |
39 | Revision 1.4 2001/11/27 13:13:07 morsch |
40 | Maximum lifetime for long-lived particles to be put on the stack is parameter. |
41 | It can be set via SetMaximumLifetime(..). |
42 | |
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43 | Revision 1.3 2001/10/16 08:48:56 morsch |
44 | Common vertex related code moved to base class AliGenerator. |
45 | |
b80a8e41 |
46 | Revision 1.2 2001/10/15 08:15:51 morsch |
47 | Event vertex and vertex truncation setting moved into AliMC. |
48 | |
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49 | Revision 1.1 2001/07/13 10:56:00 morsch |
50 | AliGenMC base class for AliGenParam and AliGenPythia commonalities. |
51 | |
e36044d6 |
52 | */ |
53 | |
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54 | // Base class for generators using external MC generators. |
55 | // For example AliGenPythia using Pythia. |
56 | // Provides basic functionality: setting of kinematic cuts on |
57 | // decay products and particle selection. |
58 | // andreas.morsch@cern.ch |
59 | |
e36044d6 |
60 | #include "AliGenMC.h" |
61 | #include "AliPDG.h" |
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62 | #include <TMath.h> |
e36044d6 |
63 | #include <TParticle.h> |
64 | |
65 | ClassImp(AliGenMC) |
66 | |
67 | AliGenMC::AliGenMC() |
68 | :AliGenerator() |
69 | { |
70 | // Default Constructor |
71 | SetCutOnChild(); |
72 | SetChildMomentumRange(); |
73 | SetChildPtRange(); |
74 | SetChildPhiRange(); |
75 | SetChildThetaRange(); |
76 | SetChildYRange(); |
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77 | SetMaximumLifetime(); |
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78 | SetGeometryAcceptance(); |
79 | SetPdgCodeParticleforAcceptanceCut(); |
80 | SetNumberOfAcceptedParticles(); |
e36044d6 |
81 | } |
82 | |
83 | AliGenMC::AliGenMC(Int_t npart) |
84 | :AliGenerator(npart) |
85 | { |
86 | // Constructor |
87 | SetCutOnChild(); |
88 | SetChildMomentumRange(); |
89 | SetChildPtRange(); |
90 | SetChildPhiRange(); |
91 | SetChildThetaRange(); |
92 | SetChildYRange(); |
93 | // |
94 | fParentSelect.Set(8); |
95 | fChildSelect.Set(8); |
96 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; |
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97 | SetMaximumLifetime(); |
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98 | SetGeometryAcceptance(); |
99 | SetPdgCodeParticleforAcceptanceCut(); |
100 | SetNumberOfAcceptedParticles(); |
e36044d6 |
101 | } |
102 | |
103 | AliGenMC::AliGenMC(const AliGenMC & mc) |
104 | { |
105 | // copy constructor |
106 | } |
107 | |
108 | AliGenMC::~AliGenMC() |
109 | { |
110 | // Destructor |
111 | } |
112 | |
113 | void AliGenMC::Init() |
114 | { |
115 | // |
116 | // Initialization |
117 | switch (fForceDecay) { |
118 | case kSemiElectronic: |
119 | case kDiElectron: |
120 | case kBJpsiDiElectron: |
121 | case kBPsiPrimeDiElectron: |
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122 | fChildSelect[0] = kElectron; |
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123 | break; |
124 | case kSemiMuonic: |
125 | case kDiMuon: |
126 | case kBJpsiDiMuon: |
127 | case kBPsiPrimeDiMuon: |
128 | case kPiToMu: |
129 | case kKaToMu: |
130 | fChildSelect[0]=kMuonMinus; |
131 | break; |
132 | case kHadronicD: |
133 | fChildSelect[0]=kPiPlus; |
134 | fChildSelect[1]=kKPlus; |
135 | break; |
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136 | case kPhiKK: |
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137 | fChildSelect[0]=kKPlus; |
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138 | case kOmega: |
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139 | case kAll: |
140 | case kNoDecay: |
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141 | case kNoDecayHeavy: |
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142 | break; |
143 | } |
144 | } |
145 | |
146 | |
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147 | Bool_t AliGenMC::ParentSelected(Int_t ip) const |
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148 | { |
149 | // True if particle is in list of parent particles to be selected |
150 | for (Int_t i=0; i<8; i++) |
151 | { |
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152 | if (fParentSelect.At(i) == ip) return kTRUE; |
e36044d6 |
153 | } |
154 | return kFALSE; |
155 | } |
156 | |
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157 | Bool_t AliGenMC::ChildSelected(Int_t ip) const |
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158 | { |
159 | // True if particle is in list of decay products to be selected |
160 | for (Int_t i=0; i<5; i++) |
161 | { |
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162 | if (fChildSelect.At(i) == ip) return kTRUE; |
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163 | } |
164 | return kFALSE; |
165 | } |
166 | |
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167 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const |
e36044d6 |
168 | { |
169 | // Perform kinematic selection |
170 | Float_t px = particle->Px(); |
171 | Float_t py = particle->Py(); |
172 | Float_t pz = particle->Pz(); |
173 | Float_t e = particle->Energy(); |
174 | Float_t pt = particle->Pt(); |
175 | Float_t p = particle->P(); |
176 | Float_t theta = particle->Theta(); |
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177 | Float_t mass = particle->GetCalcMass(); |
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178 | Float_t mt2 = pt * pt + mass * mass; |
179 | |
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180 | Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px))); |
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181 | Double_t y, y0; |
182 | |
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183 | if (TMath::Abs(pz) < e) { |
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184 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
185 | } else { |
186 | y = 1.e10; |
187 | } |
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188 | |
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189 | if (mt2) { |
190 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); |
e36044d6 |
191 | } else { |
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192 | if (TMath::Abs(y) < 1.e10) { |
193 | y0 = y; |
194 | } else { |
195 | y0 = 1.e10; |
196 | } |
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197 | } |
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198 | |
199 | y = (pz < 0) ? -y0 : y0; |
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200 | |
201 | if (flag == 0) { |
202 | // |
203 | // Primary particle cuts |
204 | // |
205 | // transverse momentum cut |
206 | if (pt > fPtMax || pt < fPtMin) { |
207 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); |
208 | return kFALSE; |
209 | } |
210 | // |
211 | // momentum cut |
212 | if (p > fPMax || p < fPMin) { |
213 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); |
214 | return kFALSE; |
215 | } |
216 | // |
217 | // theta cut |
218 | if (theta > fThetaMax || theta < fThetaMin) { |
219 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); |
220 | return kFALSE; |
221 | } |
222 | // |
223 | // rapidity cut |
224 | if (y > fYMax || y < fYMin) { |
225 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); |
226 | return kFALSE; |
227 | } |
228 | // |
229 | // phi cut |
230 | if (phi > fPhiMax || phi < fPhiMin) { |
231 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); |
232 | return kFALSE; |
233 | } |
234 | } else { |
235 | // |
236 | // Decay product cuts |
237 | // |
238 | // transverse momentum cut |
239 | if (pt > fChildPtMax || pt < fChildPtMin) { |
240 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); |
241 | return kFALSE; |
242 | } |
243 | // |
244 | // momentum cut |
245 | if (p > fChildPMax || p < fChildPMin) { |
246 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); |
247 | return kFALSE; |
248 | } |
249 | // |
250 | // theta cut |
251 | if (theta > fChildThetaMax || theta < fChildThetaMin) { |
252 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); |
253 | return kFALSE; |
254 | } |
255 | // |
256 | // rapidity cut |
257 | if (y > fChildYMax || y < fChildYMin) { |
258 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); |
259 | return kFALSE; |
260 | } |
261 | // |
262 | // phi cut |
263 | if (phi > fChildPhiMax || phi < fChildPhiMin) { |
264 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); |
265 | return kFALSE; |
266 | } |
267 | } |
268 | |
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269 | return kTRUE; |
270 | } |
271 | |
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272 | Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) |
273 | { |
274 | Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance |
275 | Int_t NumberOfPdgCodeParticleforAcceptanceCut=0; |
276 | Int_t NumberOfAcceptedPdgCodeParticleforAcceptanceCut=0; |
277 | TParticle * particle; |
278 | Int_t i; |
279 | for (i=0; i<np; i++) { |
280 | particle = (TParticle *) particles->At(i); |
281 | if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { |
282 | NumberOfPdgCodeParticleforAcceptanceCut++; |
283 | if (fGeometryAcceptance->Impact(particle)) NumberOfAcceptedPdgCodeParticleforAcceptanceCut++; |
284 | } |
285 | } |
286 | if ( NumberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) |
287 | Check = kTRUE; |
288 | else |
289 | Check = kFALSE; |
290 | |
291 | return Check; |
292 | } |
293 | |
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294 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const |
e36044d6 |
295 | { |
296 | // |
297 | // If the particle is in a diffractive state, then take action accordingly |
298 | switch (pdgcode) { |
299 | case 91: |
300 | return 92; |
301 | case 110: |
302 | //rho_diff0 -- difficult to translate, return rho0 |
303 | return 113; |
304 | case 210: |
305 | //pi_diffr+ -- change to pi+ |
306 | return 211; |
307 | case 220: |
308 | //omega_di0 -- change to omega0 |
309 | return 223; |
310 | case 330: |
311 | //phi_diff0 -- return phi0 |
312 | return 333; |
313 | case 440: |
314 | //J/psi_di0 -- return J/psi |
315 | return 443; |
316 | case 2110: |
317 | //n_diffr -- return neutron |
318 | return 2112; |
319 | case 2210: |
320 | //p_diffr+ -- return proton |
321 | return 2212; |
322 | } |
323 | //non diffractive state -- return code unchanged |
324 | return pdgcode; |
325 | } |
326 | |
327 | AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) |
328 | { |
329 | // Assignment operator |
330 | return *this; |
331 | } |
332 | |