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