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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 | $Log$ |
95450c6d |
18 | Revision 1.4 2001/11/27 13:13:07 morsch |
19 | Maximum lifetime for long-lived particles to be put on the stack is parameter. |
20 | It can be set via SetMaximumLifetime(..). |
21 | |
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22 | Revision 1.3 2001/10/16 08:48:56 morsch |
23 | Common vertex related code moved to base class AliGenerator. |
24 | |
b80a8e41 |
25 | Revision 1.2 2001/10/15 08:15:51 morsch |
26 | Event vertex and vertex truncation setting moved into AliMC. |
27 | |
dba8ac91 |
28 | Revision 1.1 2001/07/13 10:56:00 morsch |
29 | AliGenMC base class for AliGenParam and AliGenPythia commonalities. |
30 | |
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31 | */ |
32 | |
33 | #include "AliGenMC.h" |
34 | #include "AliPDG.h" |
35 | #include <TParticle.h> |
36 | |
37 | ClassImp(AliGenMC) |
38 | |
39 | AliGenMC::AliGenMC() |
40 | :AliGenerator() |
41 | { |
42 | // Default Constructor |
43 | SetCutOnChild(); |
44 | SetChildMomentumRange(); |
45 | SetChildPtRange(); |
46 | SetChildPhiRange(); |
47 | SetChildThetaRange(); |
48 | SetChildYRange(); |
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49 | SetMaximumLifetime(); |
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50 | } |
51 | |
52 | AliGenMC::AliGenMC(Int_t npart) |
53 | :AliGenerator(npart) |
54 | { |
55 | // Constructor |
56 | SetCutOnChild(); |
57 | SetChildMomentumRange(); |
58 | SetChildPtRange(); |
59 | SetChildPhiRange(); |
60 | SetChildThetaRange(); |
61 | SetChildYRange(); |
62 | // |
63 | fParentSelect.Set(8); |
64 | fChildSelect.Set(8); |
65 | for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; |
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66 | SetMaximumLifetime(); |
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67 | } |
68 | |
69 | AliGenMC::AliGenMC(const AliGenMC & mc) |
70 | { |
71 | // copy constructor |
72 | } |
73 | |
74 | AliGenMC::~AliGenMC() |
75 | { |
76 | // Destructor |
77 | } |
78 | |
79 | void AliGenMC::Init() |
80 | { |
81 | // |
82 | // Initialization |
83 | switch (fForceDecay) { |
84 | case kSemiElectronic: |
85 | case kDiElectron: |
86 | case kBJpsiDiElectron: |
87 | case kBPsiPrimeDiElectron: |
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88 | fChildSelect[0] = kElectron; |
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89 | break; |
90 | case kSemiMuonic: |
91 | case kDiMuon: |
92 | case kBJpsiDiMuon: |
93 | case kBPsiPrimeDiMuon: |
94 | case kPiToMu: |
95 | case kKaToMu: |
96 | fChildSelect[0]=kMuonMinus; |
97 | break; |
98 | case kHadronicD: |
99 | fChildSelect[0]=kPiPlus; |
100 | fChildSelect[1]=kKPlus; |
101 | break; |
102 | case kAll: |
103 | case kNoDecay: |
104 | break; |
105 | } |
106 | } |
107 | |
108 | |
109 | Bool_t AliGenMC::ParentSelected(Int_t ip) |
110 | { |
111 | // True if particle is in list of parent particles to be selected |
112 | for (Int_t i=0; i<8; i++) |
113 | { |
114 | if (fParentSelect[i]==ip) return kTRUE; |
115 | } |
116 | return kFALSE; |
117 | } |
118 | |
119 | Bool_t AliGenMC::ChildSelected(Int_t ip) |
120 | { |
121 | // True if particle is in list of decay products to be selected |
122 | for (Int_t i=0; i<5; i++) |
123 | { |
124 | if (fChildSelect[i]==ip) return kTRUE; |
125 | } |
126 | return kFALSE; |
127 | } |
128 | |
129 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) |
130 | { |
131 | // Perform kinematic selection |
132 | Float_t px = particle->Px(); |
133 | Float_t py = particle->Py(); |
134 | Float_t pz = particle->Pz(); |
135 | Float_t e = particle->Energy(); |
136 | Float_t pt = particle->Pt(); |
137 | Float_t p = particle->P(); |
138 | Float_t theta = particle->Theta(); |
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139 | Float_t mass = particle->GetMass(); |
140 | Float_t mt2 = pt * pt + mass * mass; |
141 | |
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142 | Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px))); |
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143 | Double_t y, y0; |
144 | |
145 | if (TMath::Abs(pz) != e) { |
146 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
147 | } else { |
148 | y = 1.e10; |
149 | } |
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150 | |
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151 | if (mt2) { |
152 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); |
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153 | } else { |
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154 | if (TMath::Abs(y) < 1.e10) { |
155 | y0 = y; |
156 | } else { |
157 | y0 = 1.e10; |
158 | } |
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159 | } |
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160 | |
161 | y = (pz < 0) ? -y0 : y0; |
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162 | |
163 | if (flag == 0) { |
164 | // |
165 | // Primary particle cuts |
166 | // |
167 | // transverse momentum cut |
168 | if (pt > fPtMax || pt < fPtMin) { |
169 | // printf("\n failed pt cut %f %f %f \n",pt,fPtMin,fPtMax); |
170 | return kFALSE; |
171 | } |
172 | // |
173 | // momentum cut |
174 | if (p > fPMax || p < fPMin) { |
175 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); |
176 | return kFALSE; |
177 | } |
178 | // |
179 | // theta cut |
180 | if (theta > fThetaMax || theta < fThetaMin) { |
181 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); |
182 | return kFALSE; |
183 | } |
184 | // |
185 | // rapidity cut |
186 | if (y > fYMax || y < fYMin) { |
187 | // printf("\n failed y cut %f %f %f \n",y,fYMin,fYMax); |
188 | return kFALSE; |
189 | } |
190 | // |
191 | // phi cut |
192 | if (phi > fPhiMax || phi < fPhiMin) { |
193 | // printf("\n failed phi cut %f %f %f \n",phi,fPhiMin,fPhiMax); |
194 | return kFALSE; |
195 | } |
196 | } else { |
197 | // |
198 | // Decay product cuts |
199 | // |
200 | // transverse momentum cut |
201 | if (pt > fChildPtMax || pt < fChildPtMin) { |
202 | // printf("\n failed pt cut %f %f %f \n",pt,fChildPtMin,fChildPtMax); |
203 | return kFALSE; |
204 | } |
205 | // |
206 | // momentum cut |
207 | if (p > fChildPMax || p < fChildPMin) { |
208 | // printf("\n failed p cut %f %f %f \n",p,fChildPMin,fChildPMax); |
209 | return kFALSE; |
210 | } |
211 | // |
212 | // theta cut |
213 | if (theta > fChildThetaMax || theta < fChildThetaMin) { |
214 | // printf("\n failed theta cut %f %f %f \n",theta,fChildThetaMin,fChildThetaMax); |
215 | return kFALSE; |
216 | } |
217 | // |
218 | // rapidity cut |
219 | if (y > fChildYMax || y < fChildYMin) { |
220 | // printf("\n failed y cut %f %f %f \n",y,fChildYMin,fChildYMax); |
221 | return kFALSE; |
222 | } |
223 | // |
224 | // phi cut |
225 | if (phi > fChildPhiMax || phi < fChildPhiMin) { |
226 | // printf("\n failed phi cut %f %f %f \n",phi,fChildPhiMin,fChildPhiMax); |
227 | return kFALSE; |
228 | } |
229 | } |
230 | |
231 | |
232 | |
233 | return kTRUE; |
234 | } |
235 | |
236 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) |
237 | { |
238 | // |
239 | // If the particle is in a diffractive state, then take action accordingly |
240 | switch (pdgcode) { |
241 | case 91: |
242 | return 92; |
243 | case 110: |
244 | //rho_diff0 -- difficult to translate, return rho0 |
245 | return 113; |
246 | case 210: |
247 | //pi_diffr+ -- change to pi+ |
248 | return 211; |
249 | case 220: |
250 | //omega_di0 -- change to omega0 |
251 | return 223; |
252 | case 330: |
253 | //phi_diff0 -- return phi0 |
254 | return 333; |
255 | case 440: |
256 | //J/psi_di0 -- return J/psi |
257 | return 443; |
258 | case 2110: |
259 | //n_diffr -- return neutron |
260 | return 2112; |
261 | case 2210: |
262 | //p_diffr+ -- return proton |
263 | return 2212; |
264 | } |
265 | //non diffractive state -- return code unchanged |
266 | return pdgcode; |
267 | } |
268 | |
269 | AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) |
270 | { |
271 | // Assignment operator |
272 | return *this; |
273 | } |
274 | |