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618e1dc0 | 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 | ||
7cdba479 | 16 | /* $Id$ */ |
618e1dc0 | 17 | |
18 | ||
19 | // Generator using Herwig as an external generator | |
20 | // The main Herwig options are accessable for the user through this interface. | |
21 | // Uses the THerwig implementation of TGenerator. | |
22 | ||
618e1dc0 | 23 | |
37b09b91 | 24 | #include <Riostream.h> |
25 | #include <TClonesArray.h> | |
618e1dc0 | 26 | #include <TParticle.h> |
618e1dc0 | 27 | |
37b09b91 | 28 | #include <THerwig6.h> |
618e1dc0 | 29 | |
37b09b91 | 30 | #include "AliGenHerwig.h" |
31 | #include "AliHerwigRndm.h" | |
32 | #include "AliMC.h" | |
33 | #include "AliRun.h" | |
e2054d85 | 34 | #include "driver.h" |
35 | ||
014a9521 | 36 | ClassImp(AliGenHerwig) |
618e1dc0 | 37 | |
7cdba479 | 38 | |
a1d47d99 | 39 | AliGenHerwig::AliGenHerwig() : |
40 | AliGenMC(), | |
7677b281 | 41 | fAutPDF("LHAPDF"), |
42 | fModPDF(19070), | |
2ad1e1c2 | 43 | fStrucFunc(kCTEQ5L), |
a1d47d99 | 44 | fKeep(0), |
45 | fDecaysOff(1), | |
46 | fTrigger(0), | |
47 | fSelectAll(0), | |
48 | fFlavor(0), | |
49 | fEnergyCMS(14000), | |
50 | fMomentum1(7000), | |
51 | fMomentum2(7000), | |
52 | fKineBias(1), | |
53 | fTrials(0), | |
54 | fXsection(0), | |
55 | fHerwig(0x0), | |
56 | fProcess(0), | |
2d654757 | 57 | fPtHardMin(0.), |
58 | fPtRMS(0.), | |
a1d47d99 | 59 | fMaxPr(10), |
60 | fMaxErrors(1000), | |
e2054d85 | 61 | fEnSoft(1), |
62 | fEv1Pr(0), | |
2d654757 | 63 | fEv2Pr(0), |
64 | fFileName(0) | |
618e1dc0 | 65 | { |
66 | // Constructor | |
67 | } | |
68 | ||
69 | AliGenHerwig::AliGenHerwig(Int_t npart) | |
2d654757 | 70 | :AliGenMC(npart), |
7677b281 | 71 | fAutPDF("LHAPDF"), |
72 | fModPDF(19070), | |
2d654757 | 73 | fStrucFunc(kCTEQ5L), |
74 | fKeep(0), | |
75 | fDecaysOff(1), | |
76 | fTrigger(0), | |
77 | fSelectAll(0), | |
78 | fFlavor(0), | |
79 | fEnergyCMS(14000), | |
80 | fMomentum1(7000), | |
81 | fMomentum2(7000), | |
82 | fKineBias(1), | |
83 | fTrials(0), | |
84 | fXsection(0), | |
85 | fHerwig(0x0), | |
86 | fProcess(0), | |
87 | fPtHardMin(0.), | |
88 | fPtRMS(0.), | |
89 | fMaxPr(10), | |
90 | fMaxErrors(1000), | |
91 | fEnSoft(1), | |
92 | fEv1Pr(0), | |
93 | fEv2Pr(0), | |
94 | fFileName(0) | |
618e1dc0 | 95 | { |
618e1dc0 | 96 | SetTarget(); |
97 | SetProjectile(); | |
7677b281 | 98 | // Set random number generator |
93831bcf | 99 | AliHerwigRndm::SetHerwigRandom(GetRandom()); |
618e1dc0 | 100 | } |
101 | ||
618e1dc0 | 102 | AliGenHerwig::~AliGenHerwig() |
103 | { | |
104 | // Destructor | |
105 | } | |
106 | ||
e2054d85 | 107 | void AliGenHerwig::SetEventListRange(Int_t eventFirst, Int_t eventLast) |
108 | { | |
109 | fEv1Pr = ++eventFirst; | |
110 | fEv2Pr = ++eventLast; | |
111 | if ( fEv2Pr == -1 ) fEv2Pr = fEv2Pr; | |
112 | } | |
113 | ||
618e1dc0 | 114 | void AliGenHerwig::Init() |
115 | { | |
116 | // Initialisation | |
117 | fTarget.Resize(8); | |
118 | fProjectile.Resize(8); | |
119 | SetMC(new THerwig6()); | |
d274cd60 | 120 | fHerwig=(THerwig6*) fMCEvGen; |
618e1dc0 | 121 | // initialize common blocks |
122 | fHerwig->Initialize(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess); | |
123 | // reset parameters according to user needs | |
124 | InitPDF(); | |
125 | fHerwig->SetPTMIN(fPtHardMin); | |
126 | fHerwig->SetPTRMS(fPtRMS); | |
127 | fHerwig->SetMAXPR(fMaxPr); | |
128 | fHerwig->SetMAXER(fMaxErrors); | |
129 | fHerwig->SetENSOF(fEnSoft); | |
7677b281 | 130 | |
e2054d85 | 131 | fHerwig->SetEV1PR(fEv1Pr); |
132 | fHerwig->SetEV2PR(fEv2Pr); | |
133 | ||
134 | // C---D,U,S,C,B,T QUARK AND GLUON MASSES (IN THAT ORDER) | |
135 | // RMASS(1)=0.32 | |
136 | // RMASS(2)=0.32 | |
137 | // RMASS(3)=0.5 | |
138 | // RMASS(4)=1.55 | |
7677b281 | 139 | // RMASS(5)=4.75 |
e2054d85 | 140 | // RMASS(6)=174.3 |
141 | // RMASS(13)=0.75 | |
142 | ||
143 | fHerwig->SetRMASS(4,1.2); | |
144 | fHerwig->SetRMASS(5,4.75); | |
7677b281 | 145 | |
e2054d85 | 146 | if ( fProcess < 0 ) strncpy(VVJIN.QQIN,fFileName.Data(),50); |
147 | ||
148 | fHerwig->Hwusta("PI0 "); | |
149 | ||
618e1dc0 | 150 | // compute parameter dependent constants |
151 | fHerwig->PrepareRun(); | |
152 | } | |
153 | ||
7677b281 | 154 | void AliGenHerwig::InitJimmy() |
155 | { | |
156 | // Initialisation | |
157 | fTarget.Resize(8); | |
158 | fProjectile.Resize(8); | |
159 | SetMC(new THerwig6()); | |
160 | fHerwig=(THerwig6*) fMCEvGen; | |
161 | // initialize common blocks | |
162 | fHerwig->InitializeJimmy(fProjectile, fTarget, fMomentum1, fMomentum2, fProcess); | |
163 | // reset parameters according to user needs | |
164 | InitPDF(); | |
165 | fHerwig->SetPTMIN(fPtHardMin); | |
166 | fHerwig->SetPTRMS(fPtRMS); | |
167 | fHerwig->SetMAXPR(fMaxPr); | |
168 | fHerwig->SetMAXER(fMaxErrors); | |
169 | fHerwig->SetENSOF(fEnSoft); | |
170 | ||
171 | fHerwig->SetEV1PR(fEv1Pr); | |
172 | fHerwig->SetEV2PR(fEv2Pr); | |
173 | ||
174 | // C---D,U,S,C,B,T QUARK AND GLUON MASSES (IN THAT ORDER) | |
175 | // RMASS(1)=0.32 | |
176 | // RMASS(2)=0.32 | |
177 | // RMASS(3)=0.5 | |
178 | // RMASS(4)=1.55 | |
179 | // RMASS(5)=4.75 | |
180 | // RMASS(6)=174.3 | |
181 | // RMASS(13)=0.75 | |
182 | ||
183 | fHerwig->SetRMASS(4,1.2); | |
184 | fHerwig->SetRMASS(5,4.75); | |
185 | ||
186 | if ( fProcess < 0 ) strncpy(VVJIN.QQIN,fFileName.Data(),50); | |
187 | ||
188 | fHerwig->Hwusta("PI0 "); | |
189 | ||
190 | // compute parameter dependent constants | |
191 | fHerwig->PrepareRunJimmy(); | |
192 | } | |
193 | ||
618e1dc0 | 194 | void AliGenHerwig::InitPDF() |
195 | { | |
196 | switch(fStrucFunc) | |
197 | { | |
7677b281 | 198 | // ONLY USES LHAPDF STRUCTURE FUNCTIONS |
618e1dc0 | 199 | case kGRVLO98: |
7677b281 | 200 | fModPDF=80060; |
201 | fAutPDF="HWLHAPDF"; | |
618e1dc0 | 202 | break; |
7677b281 | 203 | case kCTEQ6: |
204 | fModPDF=10040; | |
205 | fAutPDF="HWLHAPDF"; | |
206 | break; | |
207 | case kCTEQ61: | |
208 | fModPDF=10100; | |
209 | fAutPDF="HWLHAPDF"; | |
210 | break; | |
211 | case kCTEQ6m: | |
212 | fModPDF=10050; | |
213 | fAutPDF="HWLHAPDF"; | |
214 | break; | |
215 | case kCTEQ6l: | |
216 | fModPDF=10041; | |
217 | fAutPDF="HWLHAPDF"; | |
218 | break; | |
219 | case kCTEQ6ll: | |
220 | fModPDF=10042; | |
221 | fAutPDF="HWLHAPDF"; | |
222 | break; | |
223 | case kCTEQ5M: | |
224 | fModPDF=19050; | |
225 | fAutPDF="HWLHAPDF"; | |
618e1dc0 | 226 | break; |
227 | case kCTEQ5L: | |
7677b281 | 228 | fModPDF=19070; |
229 | fAutPDF="HWLHAPDF"; | |
230 | break; | |
231 | case kCTEQ4M: | |
232 | fModPDF=19150; | |
233 | fAutPDF="HWLHAPDF"; | |
234 | break; | |
235 | case kCTEQ4L: | |
236 | fModPDF=19170; | |
237 | fAutPDF="HWLHAPDF"; | |
238 | break; | |
56174e25 | 239 | // case kMRST2004nlo: |
240 | // fModPDF=20400; | |
241 | // fAutPDF="HWLHAPDF"; | |
242 | // break; | |
618e1dc0 | 243 | default: |
244 | cerr << "This structure function is not inplemented " << fStrucFunc << endl; | |
245 | break; | |
246 | } | |
7677b281 | 247 | fAutPDF.Resize(20); |
618e1dc0 | 248 | fHerwig->SetMODPDF(1,fModPDF); |
249 | fHerwig->SetMODPDF(2,fModPDF); | |
250 | fHerwig->SetAUTPDF(1,fAutPDF); | |
251 | fHerwig->SetAUTPDF(2,fAutPDF); | |
252 | } | |
253 | ||
254 | void AliGenHerwig::Generate() | |
255 | { | |
256 | // Generate one event | |
257 | ||
258 | Float_t polar[3] = {0,0,0}; | |
259 | Float_t origin[3]= {0,0,0}; | |
260 | Float_t origin0[3]= {0,0,0}; | |
261 | Float_t p[4], random[6]; | |
7677b281 | 262 | |
618e1dc0 | 263 | static TClonesArray *particles; |
264 | // converts from mm/c to s | |
265 | const Float_t kconv=0.001/2.999792458e8; | |
266 | // | |
267 | Int_t nt=0; | |
268 | Int_t jev=0; | |
269 | Int_t j, kf, ks, imo; | |
270 | kf=0; | |
7677b281 | 271 | |
618e1dc0 | 272 | if(!particles) particles=new TClonesArray("TParticle",10000); |
7677b281 | 273 | |
618e1dc0 | 274 | fTrials=0; |
275 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; | |
276 | if(fVertexSmear==kPerEvent) { | |
277 | Rndm(random,6); | |
278 | for (j=0;j<3;j++) { | |
279 | origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
280 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
281 | } | |
282 | } | |
7677b281 | 283 | |
618e1dc0 | 284 | while(1) |
285 | { | |
286 | fHerwig->GenerateEvent(); | |
287 | fTrials++; | |
288 | fHerwig->ImportParticles(particles,"All"); | |
289 | Int_t np = particles->GetEntriesFast()-1; | |
290 | if (np == 0 ) continue; | |
7677b281 | 291 | |
618e1dc0 | 292 | Int_t nc=0; |
7677b281 | 293 | |
618e1dc0 | 294 | Int_t * newPos = new Int_t[np]; |
295 | for (Int_t i = 0; i<np; i++) *(newPos+i)=-1; | |
7677b281 | 296 | |
618e1dc0 | 297 | for (Int_t i = 0; i<np; i++) { |
298 | TParticle * iparticle = (TParticle *) particles->At(i); | |
299 | imo = iparticle->GetFirstMother(); | |
300 | kf = iparticle->GetPdgCode(); | |
301 | ks = iparticle->GetStatusCode(); | |
7677b281 | 302 | if (ks != 3 && |
303 | KinematicSelection(iparticle,0)) | |
618e1dc0 | 304 | { |
305 | nc++; | |
306 | p[0]=iparticle->Px(); | |
307 | p[1]=iparticle->Py(); | |
308 | p[2]=iparticle->Pz(); | |
309 | p[3]=iparticle->Energy(); | |
310 | origin[0]=origin0[0]+iparticle->Vx()/10; | |
311 | origin[1]=origin0[1]+iparticle->Vy()/10; | |
312 | origin[2]=origin0[2]+iparticle->Vz()/10; | |
313 | Float_t tof = kconv*iparticle->T(); | |
314 | Int_t iparent = (imo > -1) ? newPos[imo] : -1; | |
315 | Int_t trackIt = (ks == 1) && fTrackIt; | |
93831bcf | 316 | PushTrack(trackIt, iparent, kf, |
317 | p[0], p[1], p[2], p[3], | |
7677b281 | 318 | origin[0], origin[1], origin[2], |
93831bcf | 319 | tof, |
320 | polar[0], polar[1], polar[2], | |
e2054d85 | 321 | kPPrimary, nt, fHerwig->GetEVWGT(), ks); |
618e1dc0 | 322 | KeepTrack(nt); |
323 | newPos[i]=nt; | |
324 | } // end of if: selection of particle | |
325 | } // end of for: particle loop | |
326 | if (newPos) delete[] newPos; | |
618e1dc0 | 327 | // MakeHeader(); |
618e1dc0 | 328 | if (nc > 0) { |
329 | jev+=nc; | |
330 | if (jev >= fNpart || fNpart == -1) { | |
331 | fKineBias=Float_t(fNpart)/Float_t(fTrials); | |
618e1dc0 | 332 | break; |
333 | } | |
334 | } | |
335 | } | |
336 | SetHighWaterMark(nt); | |
337 | // adjust weight due to kinematic selection | |
338 | AdjustWeights(); | |
339 | // get cross-section | |
340 | fXsection=fHerwig->GetAVWGT(); | |
341 | } | |
342 | ||
343 | void AliGenHerwig::AdjustWeights() | |
344 | { | |
345 | // Adjust the weights after generation of all events | |
346 | TParticle *part; | |
5d12ce38 | 347 | Int_t ntrack=gAlice->GetMCApp()->GetNtrack(); |
618e1dc0 | 348 | for (Int_t i=0; i<ntrack; i++) { |
5d12ce38 | 349 | part= gAlice->GetMCApp()->Particle(i); |
618e1dc0 | 350 | part->SetWeight(part->GetWeight()*fKineBias); |
351 | } | |
352 | } | |
7677b281 | 353 | |
618e1dc0 | 354 | |
355 | void AliGenHerwig::KeepFullEvent() | |
356 | { | |
357 | fKeep=1; | |
358 | } | |
359 | ||
360 | Bool_t AliGenHerwig::DaughtersSelection(TParticle* iparticle, TClonesArray* particles) | |
361 | { | |
362 | // | |
363 | // Looks recursively if one of the daughters has been selected | |
364 | // | |
365 | // printf("\n Consider daughters %d:",iparticle->GetPdgCode()); | |
366 | Int_t imin=-1; | |
367 | Int_t imax=-1; | |
368 | Int_t i; | |
369 | Bool_t hasDaughters= (iparticle->GetFirstDaughter() >=0); | |
370 | Bool_t selected=kFALSE; | |
371 | if (hasDaughters) { | |
372 | imin=iparticle->GetFirstDaughter(); | |
7677b281 | 373 | imax=iparticle->GetLastDaughter(); |
618e1dc0 | 374 | for (i=imin; i<= imax; i++){ |
7677b281 | 375 | TParticle * jparticle = (TParticle *) particles->At(i); |
618e1dc0 | 376 | Int_t ip=jparticle->GetPdgCode(); |
377 | if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) { | |
378 | selected=kTRUE; break; | |
379 | } | |
380 | if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; } | |
381 | } | |
382 | } else { | |
383 | return kFALSE; | |
384 | } | |
385 | ||
386 | return selected; | |
387 | } | |
388 | ||
389 | ||
390 | Bool_t AliGenHerwig::SelectFlavor(Int_t pid) | |
391 | { | |
392 | // Select flavor of particle | |
393 | // 0: all | |
394 | // 4: charm and beauty | |
395 | // 5: beauty | |
396 | if (fFlavor == 0) return kTRUE; | |
7677b281 | 397 | |
618e1dc0 | 398 | Int_t ifl=TMath::Abs(pid/100); |
399 | if (ifl > 10) ifl/=10; | |
400 | return (fFlavor == ifl); | |
401 | } | |
402 | ||
403 | Bool_t AliGenHerwig::Stable(TParticle* particle) | |
404 | { | |
405 | // Return true for a stable particle | |
406 | // | |
407 | Int_t kf = TMath::Abs(particle->GetPdgCode()); | |
7677b281 | 408 | |
618e1dc0 | 409 | if ( (particle->GetFirstDaughter() < 0 ) || (kf == 1000*fFlavor+122)) |
7677b281 | 410 | |
618e1dc0 | 411 | { |
412 | return kTRUE; | |
413 | } else { | |
414 | return kFALSE; | |
415 | } | |
416 | } | |
417 | ||
418 | void AliGenHerwig::FinishRun() | |
419 | { | |
420 | fHerwig->Hwefin(); | |
421 | } | |
422 | ||
7677b281 | 423 | void AliGenHerwig::FinishRunJimmy() |
424 | { | |
425 | fHerwig->Hwefin(); | |
426 | fHerwig->Jmefin(); | |
427 | ||
428 | } | |
618e1dc0 | 429 |