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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 | // Implementation of AliDecayer using EvtGen package. // | |
17 | // // | |
18 | // Giuseppe E. Bruno & Fiorella Fionda // | |
19 | // (Giuseppe.Bruno@ba.infn.it) (Fiorella.Fionda@ba.infn.it) // | |
20 | /////////////////////////////////////////////////////////////////////////// | |
21 | ||
22 | #include <TSystem.h> | |
23 | #include <TDatabasePDG.h> | |
24 | #include <TParticle.h> | |
25 | #include <TClonesArray.h> | |
26 | #include <TLorentzVector.h> | |
27 | ||
28 | #include "EvtGenBase/EvtStdHep.hh" | |
29 | #include "EvtGenBase/EvtRandomEngine.hh" | |
30 | #include "EvtGen/EvtGen.hh" | |
31 | #include "EvtGenBase/EvtParticle.hh" | |
32 | #include "EvtGenBase/EvtPDL.hh" | |
33 | #include "EvtGenBase/EvtParticleFactory.hh" | |
34 | #include "AliDecayerEvtGen.h" | |
35 | #include "AliLog.h" | |
36 | ||
37 | ClassImp(AliDecayerEvtGen) | |
38 | //____________________________________________________________ | |
39 | AliDecayerEvtGen::AliDecayerEvtGen(): | |
40 | fRandomEngine(0x0), | |
41 | fGenerator(0x0), | |
42 | fEvtstdhep(0x0), | |
43 | fDecayTablePath(0x0), | |
44 | fParticleTablePath(0x0), | |
45 | fDecay(kAll) | |
46 | { | |
47 | // Default constructor | |
48 | fEvtstdhep = new EvtStdHep(); | |
49 | fDecayTablePath = gSystem->ExpandPathName("$ALICE_ROOT/TEvtGen/EvtGen/DECAY.DEC"); //default decay table | |
50 | fParticleTablePath = gSystem->ExpandPathName("$ALICE_ROOT/TEvtGen/EvtGen/evt.pdl"); //particle table | |
51 | } | |
52 | //_________________________________________________________________ | |
53 | AliDecayerEvtGen::AliDecayerEvtGen(const AliDecayerEvtGen &decayer): | |
54 | AliDecayer(decayer), | |
55 | fRandomEngine(decayer.fRandomEngine), | |
56 | fGenerator(decayer.fGenerator), | |
57 | fEvtstdhep(decayer.fEvtstdhep), | |
58 | fDecayTablePath(decayer.fDecayTablePath), | |
59 | fParticleTablePath(decayer.fParticleTablePath), | |
60 | fDecay(decayer.fDecay) | |
61 | { | |
62 | // Copy Constructor | |
63 | decayer.Copy(*this); | |
64 | } | |
65 | //____________________________________________________________ | |
66 | AliDecayerEvtGen::~AliDecayerEvtGen() | |
67 | { | |
68 | // Destructor | |
69 | if(fRandomEngine) {delete fRandomEngine;} | |
70 | fRandomEngine = 0; | |
71 | if(fGenerator) {delete fGenerator;} | |
72 | fGenerator = 0; | |
73 | if(fEvtstdhep) {delete fEvtstdhep;} | |
74 | fEvtstdhep = 0; | |
75 | if(fDecayTablePath) {delete fDecayTablePath;} | |
76 | fDecayTablePath = 0; | |
77 | if(fParticleTablePath) {delete fParticleTablePath;} | |
78 | fParticleTablePath = 0; | |
79 | } | |
80 | ||
81 | //___________________________________________________________ | |
82 | void AliDecayerEvtGen::Init() | |
83 | { | |
84 | //Standard AliDecayerEvtGen initializer: | |
85 | //initialize EvtGen with default decay table (DECAY.DEC), particle table (evt.pdl) | |
86 | //and fRandomEngine for generation of random numbers | |
87 | // | |
88 | if(fGenerator){ | |
89 | AliWarning(" AliDecayerEvtGen already initialized!!!!\n"); | |
90 | return; | |
91 | } | |
92 | fRandomEngine=new EvtNUMRandomEngine(); | |
93 | fGenerator=new EvtGen(fDecayTablePath,fParticleTablePath,fRandomEngine); | |
94 | } | |
95 | //____________________________________________________________ | |
96 | void AliDecayerEvtGen::Decay(Int_t ipart, TLorentzVector *p) | |
97 | { | |
98 | // | |
99 | //Decay a particle | |
100 | //input: pdg code and momentum of the particle to be decayed | |
101 | //all informations about decay products are stored in fEvtstdhep | |
102 | // | |
103 | EvtId IPART=EvtPDL::evtIdFromStdHep(ipart); | |
104 | EvtVector4R p_init=EvtVector4R::EvtVector4R(p->E(),p->Px(),p->Py(),p->Pz()); | |
105 | EvtParticle *froot_part=EvtParticleFactory::particleFactory(IPART,p_init); | |
106 | fGenerator->generateDecay(froot_part); | |
107 | fEvtstdhep->init(); | |
108 | froot_part->makeStdHep(*fEvtstdhep); | |
109 | //froot_part->printTree(); //to print the decay chain | |
110 | froot_part->deleteTree(); | |
111 | } | |
112 | ||
113 | //____________________________________________________________ | |
114 | Int_t AliDecayerEvtGen::ImportParticles(TClonesArray *particles) | |
115 | { | |
116 | // | |
117 | //Input: pointer to a TClonesArray - Output(Int_t): number of decay products | |
118 | //Put all the informations about the decay products in the | |
119 | //TClonesArray particles | |
120 | // | |
121 | if (particles == 0) return 0; | |
122 | TClonesArray &clonesParticles = *particles; | |
123 | clonesParticles.Clear(); | |
124 | ||
125 | int j; | |
126 | int istat; | |
127 | int partnum; | |
128 | double px,py,pz,e; | |
129 | double x,y,z,t; | |
130 | EvtVector4R p4,x4; | |
131 | ||
132 | Int_t npart=fEvtstdhep->getNPart(); | |
133 | for(int i=0;i<fEvtstdhep->getNPart();i++){ | |
134 | j=i+1; | |
135 | int jmotherfirst=fEvtstdhep->getFirstMother(i)+1; | |
136 | int jmotherlast=fEvtstdhep->getLastMother(i)+1; | |
137 | int jdaugfirst=fEvtstdhep->getFirstDaughter(i)+1; | |
138 | int jdauglast=fEvtstdhep->getLastDaughter(i)+1; | |
139 | ||
140 | partnum=fEvtstdhep->getStdHepID(i); | |
141 | ||
142 | //verify if all particles of decay chain are in the TDatabasePDG | |
143 | TParticlePDG *partPDG = TDatabasePDG::Instance()->GetParticle(partnum); | |
144 | if(!partPDG) | |
145 | { | |
146 | AliWarning("Particle code non known in TDatabasePDG - set pdg = 89"); | |
147 | partnum=89; //internal use for unspecified resonance data | |
148 | } | |
149 | ||
150 | istat=fEvtstdhep->getIStat(i); | |
151 | ||
152 | if(istat!=1 && istat!=2) Info("ImportParticles","Attention: unknown status code!"); | |
153 | if(istat == 2) istat = 11; //status decayed | |
154 | ||
155 | p4=fEvtstdhep->getP4(i); | |
156 | x4=fEvtstdhep->getX4(i); | |
157 | px=p4.get(1); | |
158 | py=p4.get(2); | |
159 | pz=p4.get(3); | |
160 | e=p4.get(0); | |
161 | ||
162 | x=x4.get(1);//[mm] | |
163 | y=x4.get(2);//[mm] | |
164 | z=x4.get(3);//[mm] | |
165 | t=x4.get(0);//[mm] | |
166 | ||
167 | AliDebug(1,Form("partnum = %d istat = %d primaMadre = %d ultimaMadre = %d primaF = %d ultimaF=%d x=%f y=%f z=%f t=%f e=%f px=%f \n",partnum,istat,jmotherfirst,jmotherlast,jdaugfirst,jdauglast,x,y,z,t,e,px)); | |
168 | ||
169 | new(clonesParticles[i]) TParticle(partnum,istat,jmotherfirst,-1,jdaugfirst,jdauglast,px,py,pz,e,x,y,z,t); | |
170 | ||
171 | //set polarization!!! | |
172 | } | |
173 | ||
174 | return npart; | |
175 | ||
176 | } | |
177 | ||
178 | void AliDecayerEvtGen::Copy(TObject &) const | |
179 | { | |
180 | // | |
181 | // Copy *this onto AliDecayerEvtGen -- not implemented | |
182 | // | |
183 | Fatal("Copy","Not implemented!\n"); | |
184 | } | |
185 | ||
186 | void AliDecayerEvtGen::ForceDecay() | |
187 | { | |
188 | // | |
189 | // Intupt: none - Output: none | |
190 | // Set the decay mode to decay particles: for each case is read a | |
191 | // different decay table. case kAll read the default decay table only | |
192 | // | |
193 | Decay_t decay = fDecay; | |
194 | switch(decay) | |
195 | { | |
196 | case kAll: | |
197 | break; | |
198 | case kBJpsiDiElectron: | |
199 | SetDecayTablePath(gSystem->ExpandPathName("$ALICE_ROOT/TEvtGen/EvtGen/DecayTable/BTOJPSITOELE.DEC")); | |
200 | break; | |
201 | case kBJpsi: | |
202 | SetDecayTablePath(gSystem->ExpandPathName("$ALICE_ROOT/TEvtGen/EvtGen/DecayTable/BTOJPSI.DEC")); | |
203 | break; | |
204 | case kBJpsiDiMuon: | |
205 | SetDecayTablePath(gSystem->ExpandPathName("$ALICE_ROOT/TEvtGen/EvtGen/DecayTable/BTOJPSITOMU.DEC")); | |
206 | break; | |
207 | case kBSemiElectronic: | |
208 | SetDecayTablePath(gSystem->ExpandPathName("$ALICE_ROOT/TEvtGen/EvtGen/DecayTable/BTOELE.DEC")); | |
209 | break; | |
210 | case kHardMuons: | |
211 | case kChiToJpsiGammaToMuonMuon: | |
212 | case kChiToJpsiGammaToElectronElectron: | |
213 | case kBSemiMuonic: | |
214 | case kSemiMuonic: | |
215 | case kDiMuon: | |
216 | case kSemiElectronic: | |
217 | case kDiElectron: | |
218 | case kBPsiPrimeDiMuon: | |
219 | case kPiToMu: | |
220 | case kKaToMu: | |
221 | case kAllMuonic: | |
222 | case kWToMuon: | |
223 | case kWToCharm: | |
224 | case kWToCharmToMuon: | |
225 | case kZDiMuon: | |
226 | case kZDiElectron: | |
227 | case kHadronicD: | |
228 | case kHadronicDWithout4Bodies: | |
229 | case kPhiKK: | |
230 | case kOmega: | |
231 | case kLambda: | |
232 | case kNoDecay: | |
233 | case kNoDecayHeavy: | |
234 | case kNeutralPion: | |
235 | case kBPsiPrimeDiElectron: | |
236 | AliWarning(Form("Warning: case %s not implemented for this class!",(Char_t)decay)); | |
237 | break; | |
238 | } | |
239 | ReadDecayTable(); | |
240 | } | |
241 | ||
242 | Float_t AliDecayerEvtGen::GetPartialBranchingRatio(Int_t) | |
243 | { | |
244 | // This method is dummy | |
245 | return 1.; | |
246 | } | |
247 | ||
248 | Float_t AliDecayerEvtGen::GetLifetime(Int_t kf) | |
249 | { | |
250 | // | |
251 | //Input: pdg code of a particle | |
252 | //return lifetime in sec for a particle with particle code kf | |
253 | // | |
254 | EvtId IdPart=EvtPDL::evtIdFromStdHep(kf); | |
255 | Double_t lifetime = EvtPDL::getctau(IdPart); //c*tau (mm) | |
256 | AliDebug(1,Form("lifetime is %f (mum) , particle id= %d",lifetime*1000,kf)); | |
257 | return lifetime*kconv; //tau (sec) | |
258 | } | |
259 | ||
260 | void AliDecayerEvtGen::ReadDecayTable() | |
261 | { | |
262 | //Input none - Output none | |
263 | //Read the decay table that correspond to the path | |
264 | //fDecayTablePath | |
265 | // | |
266 | TString temp = fDecayTablePath; | |
267 | if(!temp.EndsWith("DECAY.DEC")) | |
268 | fGenerator->readUDecay(fDecayTablePath); | |
269 | } | |
270 | //////////////////////////////////////////////////////////// | |
271 | Bool_t AliDecayerEvtGen::SetDecayTablePath(Char_t *path) | |
272 | { | |
273 | // | |
274 | //Set the path of the decay table read to force particle decays | |
275 | // | |
276 | if(gSystem->AccessPathName(path)) | |
277 | { | |
278 | AliWarning("Attention: This path not exist!\n"); | |
279 | return kFALSE; | |
280 | } | |
281 | fDecayTablePath = path; | |
282 | return kTRUE; | |
283 | } | |
284 | ||
285 | ||
286 |