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e36044d6 | 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 | ||
47fc6bd5 | 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 | ||
e36044d6 | 37 | */ |
38 | ||
62d0ae06 | 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 | ||
e36044d6 | 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(); | |
47fc6bd5 | 61 | SetMaximumLifetime(); |
e36044d6 | 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; | |
47fc6bd5 | 78 | SetMaximumLifetime(); |
e36044d6 | 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: | |
47fc6bd5 | 100 | fChildSelect[0] = kElectron; |
e36044d6 | 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; | |
62d0ae06 | 114 | case kOmega: |
e36044d6 | 115 | case kAll: |
116 | case kNoDecay: | |
117 | break; | |
118 | } | |
119 | } | |
120 | ||
121 | ||
62d0ae06 | 122 | Bool_t AliGenMC::ParentSelected(Int_t ip) const |
e36044d6 | 123 | { |
124 | // True if particle is in list of parent particles to be selected | |
125 | for (Int_t i=0; i<8; i++) | |
126 | { | |
62d0ae06 | 127 | if (fParentSelect.At(i) == ip) return kTRUE; |
e36044d6 | 128 | } |
129 | return kFALSE; | |
130 | } | |
131 | ||
62d0ae06 | 132 | Bool_t AliGenMC::ChildSelected(Int_t ip) const |
e36044d6 | 133 | { |
134 | // True if particle is in list of decay products to be selected | |
135 | for (Int_t i=0; i<5; i++) | |
136 | { | |
62d0ae06 | 137 | if (fChildSelect.At(i) == ip) return kTRUE; |
e36044d6 | 138 | } |
139 | return kFALSE; | |
140 | } | |
141 | ||
62d0ae06 | 142 | Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) const |
e36044d6 | 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(); | |
95450c6d | 152 | Float_t mass = particle->GetMass(); |
153 | Float_t mt2 = pt * pt + mass * mass; | |
154 | ||
e36044d6 | 155 | Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px))); |
95450c6d | 156 | Double_t y, y0; |
157 | ||
fef61e14 | 158 | if (TMath::Abs(pz) < e) { |
95450c6d | 159 | y = 0.5*TMath::Log((e+pz)/(e-pz)); |
160 | } else { | |
161 | y = 1.e10; | |
162 | } | |
e36044d6 | 163 | |
95450c6d | 164 | if (mt2) { |
165 | y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2); | |
e36044d6 | 166 | } else { |
95450c6d | 167 | if (TMath::Abs(y) < 1.e10) { |
168 | y0 = y; | |
169 | } else { | |
170 | y0 = 1.e10; | |
171 | } | |
e36044d6 | 172 | } |
95450c6d | 173 | |
174 | y = (pz < 0) ? -y0 : y0; | |
e36044d6 | 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 | ||
62d0ae06 | 249 | Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const |
e36044d6 | 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 |