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b46943fe | 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 | $Log$ | |
b9d0a01d | 18 | Revision 1.2.2.3 2002/10/11 10:40:46 hristov |
19 | Default case added | |
20 | ||
21 | Revision 1.2.2.2 2002/07/26 18:34:02 alibrary | |
22 | Updating VirtualMC | |
23 | ||
24 | Revision 1.3 2002/07/26 15:32:24 hristov | |
25 | stream.h doesn't exest on Sun, removed from includes | |
26 | ||
1784616d | 27 | Revision 1.2 2002/07/19 11:43:10 morsch |
28 | - Write full stack. | |
29 | - Use SetTrack passing energy. | |
30 | ||
dc2691e2 | 31 | Revision 1.1 2002/07/16 11:33:26 morsch |
32 | First commit. | |
33 | ||
b46943fe | 34 | */ |
35 | ||
36 | ||
37 | ||
38 | // Generator using Herwig as an external generator | |
39 | // The main Herwig options are accessable for the user through this interface. | |
40 | // Uses the THerwig implementation of TGenerator. | |
41 | ||
b46943fe | 42 | #include "AliGenHerwig.h" |
43 | #include "AliRun.h" | |
44 | ||
45 | #include <TParticle.h> | |
46 | #include "THerwig6.h" | |
47 | ||
b9d0a01d | 48 | #include "Riostream.h" |
b46943fe | 49 | |
50 | ClassImp(AliGenHerwig) | |
51 | ||
52 | AliGenHerwig::AliGenHerwig() | |
53 | { | |
54 | // Constructor | |
55 | } | |
56 | ||
57 | AliGenHerwig::AliGenHerwig(Int_t npart) | |
dc2691e2 | 58 | :AliGenMC(npart) |
b46943fe | 59 | { |
60 | SetBeamMomenta(); | |
61 | SetTarget(); | |
62 | SetProjectile(); | |
63 | SetStrucFunc(kGRVLO98); | |
64 | fKeep=0; | |
65 | fTrigger=0; | |
66 | fDecaysOff=1; | |
67 | fSelectAll=0; | |
68 | fFlavor=0; | |
69 | fPtHardMin=10.; | |
70 | fPtRMS=0.0; | |
71 | fEnSoft=1.0; | |
72 | fMaxPr=1; | |
73 | fMaxErrors=1000; | |
74 | // Set random number | |
75 | if (!sRandom) sRandom=fRandom; | |
76 | } | |
77 | ||
78 | AliGenHerwig::AliGenHerwig(const AliGenHerwig & Herwig) | |
79 | { | |
80 | // copy constructor | |
81 | } | |
82 | ||
83 | ||
84 | AliGenHerwig::~AliGenHerwig() | |
85 | { | |
86 | // Destructor | |
87 | } | |
88 | ||
89 | void AliGenHerwig::Init() | |
90 | { | |
91 | // Initialisation | |
92 | fTarget.Resize(8); | |
93 | fProjectile.Resize(8); | |
94 | SetMC(new THerwig6()); | |
95 | fHerwig=(THerwig6*) fgMCEvGen; | |
96 | // initialize common blocks | |
97 | fHerwig->Initialize(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess); | |
98 | // reset parameters according to user needs | |
99 | InitPDF(); | |
100 | fHerwig->SetPTMIN(fPtHardMin); | |
101 | fHerwig->SetPTRMS(fPtRMS); | |
102 | fHerwig->SetMAXPR(fMaxPr); | |
103 | fHerwig->SetMAXER(fMaxErrors); | |
104 | fHerwig->SetENSOF(fEnSoft); | |
105 | // compute parameter dependent constants | |
106 | fHerwig->PrepareRun(); | |
107 | } | |
108 | ||
109 | void AliGenHerwig::InitPDF() | |
110 | { | |
111 | switch(fStrucFunc) | |
112 | { | |
113 | case kGRVLO: | |
114 | fModPDF=5; | |
115 | fAutPDF="GRV"; | |
116 | break; | |
117 | case kGRVHO: | |
118 | fModPDF=6; | |
119 | fAutPDF="GRV"; | |
120 | break; | |
121 | case kGRVLO98: | |
122 | fModPDF=12; | |
123 | fAutPDF="GRV"; | |
124 | break; | |
125 | case kMRSDminus: | |
126 | fModPDF=31; | |
127 | fAutPDF="MRS"; | |
128 | break; | |
129 | case kMRSD0: | |
130 | fModPDF=30; | |
131 | fAutPDF="MRS"; | |
132 | break; | |
133 | case kMRSG: | |
134 | fModPDF=41; | |
135 | fAutPDF="MRS"; | |
136 | break; | |
137 | case kMRSTcgLO: | |
138 | fModPDF=72; | |
139 | fAutPDF="MRS"; | |
140 | break; | |
141 | case kCTEQ4M: | |
142 | fModPDF=34; | |
143 | fAutPDF="CTEQ"; | |
144 | break; | |
145 | case kCTEQ5L: | |
146 | fModPDF=46; | |
147 | fAutPDF="CTEQ"; | |
148 | break; | |
b9d0a01d | 149 | default: |
150 | cerr << "This structure function is not inplemented " << fStrucFunc << endl; | |
151 | break; | |
b46943fe | 152 | } |
153 | fAutPDF.Resize(20); | |
154 | fHerwig->SetMODPDF(1,fModPDF); | |
155 | fHerwig->SetMODPDF(2,fModPDF); | |
156 | fHerwig->SetAUTPDF(1,fAutPDF); | |
157 | fHerwig->SetAUTPDF(2,fAutPDF); | |
158 | } | |
159 | ||
160 | void AliGenHerwig::Generate() | |
161 | { | |
162 | // Generate one event | |
163 | ||
164 | Float_t polar[3] = {0,0,0}; | |
165 | Float_t origin[3]= {0,0,0}; | |
166 | Float_t origin0[3]= {0,0,0}; | |
dc2691e2 | 167 | Float_t p[4], random[6]; |
b46943fe | 168 | |
169 | static TClonesArray *particles; | |
170 | // converts from mm/c to s | |
171 | const Float_t kconv=0.001/2.999792458e8; | |
172 | // | |
173 | Int_t nt=0; | |
174 | Int_t jev=0; | |
175 | Int_t j, kf, ks, imo; | |
176 | kf=0; | |
177 | ||
178 | if(!particles) particles=new TClonesArray("TParticle",10000); | |
179 | ||
180 | fTrials=0; | |
181 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; | |
182 | if(fVertexSmear==kPerEvent) { | |
183 | Rndm(random,6); | |
184 | for (j=0;j<3;j++) { | |
185 | origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
186 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
187 | } | |
188 | } | |
dc2691e2 | 189 | |
b46943fe | 190 | while(1) |
191 | { | |
dc2691e2 | 192 | fHerwig->GenerateEvent(); |
193 | fTrials++; | |
194 | fHerwig->ImportParticles(particles,"All"); | |
195 | Int_t np = particles->GetEntriesFast()-1; | |
196 | if (np == 0 ) continue; | |
197 | ||
198 | Int_t nc=0; | |
199 | ||
200 | Int_t * newPos = new Int_t[np]; | |
201 | for (Int_t i = 0; i<np; i++) *(newPos+i)=-1; | |
202 | ||
203 | for (Int_t i = 0; i<np; i++) { | |
204 | TParticle * iparticle = (TParticle *) particles->At(i); | |
205 | imo = iparticle->GetFirstMother(); | |
206 | kf = iparticle->GetPdgCode(); | |
207 | ks = iparticle->GetStatusCode(); | |
208 | if (ks != 3 && | |
209 | KinematicSelection(iparticle,0)) | |
210 | { | |
211 | nc++; | |
212 | p[0]=iparticle->Px(); | |
213 | p[1]=iparticle->Py(); | |
214 | p[2]=iparticle->Pz(); | |
215 | p[3]=iparticle->Energy(); | |
216 | origin[0]=origin0[0]+iparticle->Vx()/10; | |
217 | origin[1]=origin0[1]+iparticle->Vy()/10; | |
218 | origin[2]=origin0[2]+iparticle->Vz()/10; | |
219 | Float_t tof = kconv*iparticle->T(); | |
220 | Int_t iparent = (imo > -1) ? newPos[imo] : -1; | |
221 | Int_t trackIt = (ks == 1) && fTrackIt; | |
222 | gAlice->SetTrack(trackIt, iparent, kf, | |
223 | p[0], p[1], p[2], p[3], | |
224 | origin[0], origin[1], origin[2], | |
225 | tof, | |
226 | polar[0], polar[1], polar[2], | |
227 | kPPrimary, nt, 1., ks); | |
228 | KeepTrack(nt); | |
229 | newPos[i]=nt; | |
230 | } // end of if: selection of particle | |
231 | } // end of for: particle loop | |
232 | if (newPos) delete[] newPos; | |
233 | printf("\n I've put %i particles on the stack \n",nc); | |
234 | // MakeHeader(); | |
235 | printf("nc: %d %d\n", nc, fNpart); | |
236 | ||
237 | if (nc > 0) { | |
238 | jev+=nc; | |
239 | if (jev >= fNpart || fNpart == -1) { | |
240 | fKineBias=Float_t(fNpart)/Float_t(fTrials); | |
241 | printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev); | |
242 | break; | |
243 | } | |
b46943fe | 244 | } |
b46943fe | 245 | } |
dc2691e2 | 246 | SetHighWaterMark(nt); |
b46943fe | 247 | // adjust weight due to kinematic selection |
dc2691e2 | 248 | AdjustWeights(); |
b46943fe | 249 | // get cross-section |
dc2691e2 | 250 | fXsection=fHerwig->GetAVWGT(); |
b46943fe | 251 | } |
252 | ||
253 | void AliGenHerwig::AdjustWeights() | |
254 | { | |
255 | // Adjust the weights after generation of all events | |
256 | TParticle *part; | |
257 | Int_t ntrack=gAlice->GetNtrack(); | |
258 | for (Int_t i=0; i<ntrack; i++) { | |
259 | part= gAlice->Particle(i); | |
260 | part->SetWeight(part->GetWeight()*fKineBias); | |
261 | } | |
262 | } | |
263 | ||
264 | ||
265 | void AliGenHerwig::KeepFullEvent() | |
266 | { | |
267 | fKeep=1; | |
268 | } | |
269 | ||
270 | Bool_t AliGenHerwig::DaughtersSelection(TParticle* iparticle, TClonesArray* particles) | |
271 | { | |
272 | // | |
273 | // Looks recursively if one of the daughters has been selected | |
274 | // | |
275 | // printf("\n Consider daughters %d:",iparticle->GetPdgCode()); | |
276 | Int_t imin=-1; | |
277 | Int_t imax=-1; | |
278 | Int_t i; | |
279 | Bool_t hasDaughters= (iparticle->GetFirstDaughter() >=0); | |
280 | Bool_t selected=kFALSE; | |
281 | if (hasDaughters) { | |
282 | imin=iparticle->GetFirstDaughter(); | |
283 | imax=iparticle->GetLastDaughter(); | |
284 | for (i=imin; i<= imax; i++){ | |
285 | TParticle * jparticle = (TParticle *) particles->At(i); | |
286 | Int_t ip=jparticle->GetPdgCode(); | |
287 | if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) { | |
288 | selected=kTRUE; break; | |
289 | } | |
290 | if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; } | |
291 | } | |
292 | } else { | |
293 | return kFALSE; | |
294 | } | |
295 | ||
296 | return selected; | |
297 | } | |
298 | ||
299 | ||
300 | Bool_t AliGenHerwig::SelectFlavor(Int_t pid) | |
301 | { | |
302 | // Select flavor of particle | |
303 | // 0: all | |
304 | // 4: charm and beauty | |
305 | // 5: beauty | |
306 | if (fFlavor == 0) return kTRUE; | |
307 | ||
308 | Int_t ifl=TMath::Abs(pid/100); | |
309 | if (ifl > 10) ifl/=10; | |
310 | return (fFlavor == ifl); | |
311 | } | |
312 | ||
313 | Bool_t AliGenHerwig::Stable(TParticle* particle) | |
314 | { | |
315 | // Return true for a stable particle | |
316 | // | |
317 | Int_t kf = TMath::Abs(particle->GetPdgCode()); | |
318 | ||
319 | if ( (particle->GetFirstDaughter() < 0 ) || (kf == 1000*fFlavor+122)) | |
320 | ||
321 | { | |
322 | return kTRUE; | |
323 | } else { | |
324 | return kFALSE; | |
325 | } | |
326 | } | |
327 | ||
328 | void AliGenHerwig::FinishRun() | |
329 | { | |
330 | fHerwig->Hwefin(); | |
331 | } | |
332 | ||
dc2691e2 | 333 | |
b46943fe | 334 | AliGenHerwig& AliGenHerwig::operator=(const AliGenHerwig& rhs) |
335 | { | |
336 | // Assignment operator | |
337 | return *this; | |
338 | } | |
339 | ||
340 | ||
341 | extern "C" { | |
342 | Double_t hwr_() {return sRandom->Rndm();} | |
343 | } |