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4c039060 | 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 | $Log$ | |
28337bc1 | 18 | Revision 1.12 1999/11/03 17:43:20 fca |
19 | New version from G.Martinez & A.Morsch | |
20 | ||
886b6f73 | 21 | Revision 1.11 1999/09/29 09:24:14 fca |
22 | Introduction of the Copyright and cvs Log | |
23 | ||
4c039060 | 24 | */ |
25 | ||
fe4da5cc | 26 | #include "AliGenParam.h" |
27 | #include "AliGenMUONlib.h" | |
886b6f73 | 28 | #include "AliGenPHOSlib.h" |
fe4da5cc | 29 | #include "AliRun.h" |
fe4da5cc | 30 | #include "AliPythia.h" |
31 | #include <TDirectory.h> | |
32 | #include <TFile.h> | |
33 | #include <TTree.h> | |
34 | #include <stdlib.h> | |
1578254f | 35 | #include <TParticle.h> |
fe4da5cc | 36 | |
37 | ClassImp(AliGenParam) | |
38 | ||
39 | //------------------------------------------------------------ | |
40 | ||
41 | //Begin_Html | |
42 | /* | |
1439f98e | 43 | <img src="picts/AliGenParam.gif"> |
fe4da5cc | 44 | */ |
45 | //End_Html | |
46 | ||
47 | //____________________________________________________________ | |
48 | //____________________________________________________________ | |
49 | AliGenParam::AliGenParam() | |
50 | :AliGenerator() | |
51 | { | |
52 | fPtPara = 0; | |
53 | fYPara = 0; | |
b7601ac4 | 54 | fParam = jpsi_p; |
55 | fAnalog = analog; | |
21aaa175 | 56 | SetCutOnChild(); |
fe4da5cc | 57 | } |
58 | ||
59 | //____________________________________________________________ | |
886b6f73 | 60 | |
61 | AliGenParam::AliGenParam(Int_t npart, Param_t param) :AliGenerator(npart) | |
fe4da5cc | 62 | { |
63 | // | |
64 | // fName="HMESONpara"; | |
65 | // fTitle="Heavy Mesons Parametrisation"; | |
b7601ac4 | 66 | fPtParaFunc = AliGenMUONlib::GetPt(param); |
67 | fYParaFunc = AliGenMUONlib::GetY(param); | |
68 | fIpParaFunc = AliGenMUONlib::GetIp(param); | |
fe4da5cc | 69 | |
70 | fPtPara = 0; | |
71 | fYPara = 0; | |
b7601ac4 | 72 | fParam = param; |
73 | fAnalog = analog; | |
fe4da5cc | 74 | fChildSelect.Set(5); |
75 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
886b6f73 | 76 | SetForceDecay(); |
21aaa175 | 77 | SetCutOnChild(); |
fe4da5cc | 78 | } |
79 | ||
886b6f73 | 80 | AliGenParam::AliGenParam(Int_t npart, Param_t param, |
81 | Double_t (*PtPara) (Double_t*, Double_t*), | |
82 | Double_t (*YPara ) (Double_t* ,Double_t*), | |
83 | Int_t (*IpPara) ()) | |
84 | :AliGenerator(npart) | |
85 | { | |
28337bc1 | 86 | // Gines Martinez 1/10/99 |
886b6f73 | 87 | fPtParaFunc = PtPara; |
88 | fYParaFunc = YPara; | |
89 | fIpParaFunc = IpPara; | |
28337bc1 | 90 | // |
886b6f73 | 91 | fPtPara = 0; |
92 | fYPara = 0; | |
93 | fParam = param; | |
94 | fAnalog = analog; | |
95 | fChildSelect.Set(5); | |
96 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
97 | SetForceDecay(); | |
98 | SetCutOnChild(); | |
99 | } | |
100 | ||
fe4da5cc | 101 | //____________________________________________________________ |
102 | AliGenParam::~AliGenParam() | |
103 | { | |
104 | delete fPtPara; | |
105 | delete fYPara; | |
106 | } | |
107 | ||
108 | //____________________________________________________________ | |
109 | void AliGenParam::Init() | |
110 | { | |
111 | SetMC(new AliPythia()); | |
112 | fPythia= (AliPythia*) fgMCEvGen; | |
113 | ||
114 | // End of the test !!! | |
115 | //Begin_Html | |
116 | /* | |
1439f98e | 117 | <img src="picts/AliGenParam.gif"> |
fe4da5cc | 118 | */ |
119 | //End_Html | |
120 | ||
b7601ac4 | 121 | fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0); |
122 | fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0); | |
123 | TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0); | |
124 | TF1* YPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0); | |
125 | ||
fe4da5cc | 126 | // |
127 | // dN/dy| y=0 | |
128 | Double_t y1=0; | |
129 | Double_t y2=0; | |
130 | ||
131 | fdNdy0=fYParaFunc(&y1,&y2); | |
132 | // | |
133 | // Integral over generation region | |
b7601ac4 | 134 | Float_t IntYS = YPara ->Integral(fYMin, fYMax); |
135 | Float_t IntPt0 = PtPara->Integral(0,15); | |
136 | Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax); | |
fe4da5cc | 137 | Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi(); |
82db6e43 | 138 | if (fAnalog == analog) { |
fe4da5cc | 139 | fYWgt = IntYS/fdNdy0; |
140 | fPtWgt = IntPtS/IntPt0; | |
141 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
142 | } else { | |
143 | fYWgt = IntYS/fdNdy0; | |
144 | fPtWgt = (fPtMax-fPtMin)/IntPt0; | |
145 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
146 | } | |
147 | // | |
148 | // particle decay related initialization | |
149 | fPythia->DefineParticles(); | |
150 | // semimuonic decays of charm and beauty | |
151 | fPythia->ForceDecay(fForceDecay); | |
152 | // | |
153 | switch (fForceDecay) | |
154 | { | |
155 | case semielectronic: | |
156 | case dielectron: | |
157 | case b_jpsi_dielectron: | |
158 | case b_psip_dielectron: | |
159 | fChildSelect[0]=11; | |
160 | break; | |
161 | case semimuonic: | |
162 | case dimuon: | |
163 | case b_jpsi_dimuon: | |
164 | case b_psip_dimuon: | |
165 | fChildSelect[0]=13; | |
166 | break; | |
b7601ac4 | 167 | case pitomu: |
168 | fChildSelect[0]=13; | |
169 | break; | |
170 | case katomu: | |
171 | fChildSelect[0]=13; | |
172 | break; | |
886b6f73 | 173 | case nodecay: |
174 | break; | |
175 | case all: | |
176 | break; | |
fe4da5cc | 177 | } |
fe4da5cc | 178 | } |
179 | ||
180 | //____________________________________________________________ | |
181 | void AliGenParam::Generate() | |
182 | { | |
28337bc1 | 183 | // |
184 | // Generate 'npart' of light and heavy mesons (J/Psi, upsilon or phi, Pion, | |
185 | // Kaons, Etas, Omegas) and Baryons (proton, antiprotons, neutrons and | |
186 | // antineutrons in the the desired theta, phi and momentum windows; | |
187 | // Gaussian smearing on the vertex is done if selected. | |
188 | // The decay of heavy mesons is done using lujet, and the childern particle are tracked by GEANT | |
189 | // However, light mesons are directly tracked by GEANT setting fForceDecay = nodecay (SetForceDecay(nodecay)) | |
190 | // | |
fe4da5cc | 191 | |
28337bc1 | 192 | // printf("Generate !!!!!!!!!!!!!\n"); |
21aaa175 | 193 | |
28337bc1 | 194 | Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking) |
195 | Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking) | |
196 | Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle | |
197 | Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum | |
198 | Float_t p[3], pc[3], | |
199 | och[3], pch[10][3]; // Momentum, polarisation and origin of the children particles from lujet | |
fe4da5cc | 200 | Float_t ty, xmt; |
21aaa175 | 201 | Int_t nt, i, j, kfch[10]; |
fe4da5cc | 202 | Float_t wgtp, wgtch; |
203 | Double_t dummy; | |
09fd3ea2 | 204 | static TClonesArray *particles; |
fe4da5cc | 205 | // |
09fd3ea2 | 206 | if(!particles) particles=new TClonesArray("TParticle",1000); |
fe4da5cc | 207 | // |
208 | Float_t random[6]; | |
28337bc1 | 209 | |
210 | // Calculating vertex position per event | |
fe4da5cc | 211 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; |
212 | if(fVertexSmear==perEvent) { | |
cfce8870 | 213 | gMC->Rndm(random,6); |
fe4da5cc | 214 | for (j=0;j<3;j++) { |
215 | origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
216 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
217 | } | |
218 | } | |
21aaa175 | 219 | Int_t ipa=0; |
28337bc1 | 220 | // Generating fNpart particles |
21aaa175 | 221 | while (ipa<fNpart) { |
222 | while(1) { | |
fe4da5cc | 223 | // |
224 | // particle type | |
225 | Int_t Ipart = fIpParaFunc(); | |
226 | fChildWeight=(fPythia->GetBraPart(Ipart))*fParentWeight; | |
227 | Float_t am=fPythia->GetPMAS(fPythia->LuComp(Ipart),1); | |
cfce8870 | 228 | gMC->Rndm(random,2); |
fe4da5cc | 229 | // |
230 | // phi | |
231 | phi=fPhiMin+random[0]*(fPhiMax-fPhiMin); | |
232 | // | |
233 | // y | |
234 | ty=Float_t(TMath::TanH(fYPara->GetRandom())); | |
235 | // | |
236 | // pT | |
82db6e43 | 237 | if (fAnalog == analog) { |
fe4da5cc | 238 | pt=fPtPara->GetRandom(); |
239 | wgtp=fParentWeight; | |
240 | wgtch=fChildWeight; | |
241 | } else { | |
242 | pt=fPtMin+random[1]*(fPtMax-fPtMin); | |
243 | Double_t ptd=pt; | |
244 | wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy); | |
245 | wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy); | |
246 | } | |
247 | xmt=sqrt(pt*pt+am*am); | |
248 | pl=xmt*ty/sqrt(1.-ty*ty); | |
249 | theta=TMath::ATan2(pt,pl); | |
250 | if(theta<fThetaMin || theta>fThetaMax) continue; | |
251 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
252 | if(ptot<fPMin || ptot>fPMax) continue; | |
253 | p[0]=pt*TMath::Cos(phi); | |
254 | p[1]=pt*TMath::Sin(phi); | |
255 | p[2]=pl; | |
256 | if(fVertexSmear==perTrack) { | |
cfce8870 | 257 | gMC->Rndm(random,6); |
fe4da5cc | 258 | for (j=0;j<3;j++) { |
259 | origin0[j]= | |
260 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
261 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
262 | } | |
263 | } | |
28337bc1 | 264 | |
265 | // Looking at fForceDecay : | |
266 | // if fForceDecay != none Primary particle decays using | |
267 | // AliPythia and children are tracked by GEANT | |
268 | // | |
269 | // if fForceDecay == none Primary particle is tracked by GEANT | |
270 | // (In the latest, make sure that GEANT actually does all the decays you want) | |
fe4da5cc | 271 | // |
886b6f73 | 272 | if (fForceDecay != nodecay) { |
28337bc1 | 273 | // Using lujet to decay particle |
886b6f73 | 274 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); |
275 | fPythia->DecayParticle(Ipart,energy,theta,phi); | |
276 | // fPythia->LuList(1); | |
277 | //printf("origin0 %f %f %f\n",origin0[0],origin0[1],origin0[2]); | |
278 | //printf("fCutOnChild %d \n",fCutOnChild); | |
fe4da5cc | 279 | // |
280 | // select muons | |
886b6f73 | 281 | Int_t np=fPythia->ImportParticles(particles,"All"); |
282 | //printf("np %d \n",np); | |
283 | Int_t ncsel=0; | |
284 | for (i = 1; i<np; i++) { | |
285 | TParticle * iparticle = (TParticle *) particles->At(i); | |
286 | Int_t kf = iparticle->GetPdgCode(); | |
fe4da5cc | 287 | // |
288 | // children | |
886b6f73 | 289 | if (ChildSelected(TMath::Abs(kf))) |
290 | { | |
291 | pc[0]=iparticle->Px(); | |
292 | pc[1]=iparticle->Py(); | |
293 | pc[2]=iparticle->Pz(); | |
294 | och[0]=origin0[0]+iparticle->Vx()/10; | |
295 | och[1]=origin0[1]+iparticle->Vy()/10; | |
296 | och[2]=origin0[2]+iparticle->Vz()/10; | |
297 | if (fCutOnChild) { | |
298 | Float_t PtChild=TMath::Sqrt(pc[0]*pc[0]+pc[1]*pc[1]); | |
299 | Float_t PChild=TMath::Sqrt(PtChild*PtChild+pc[2]*pc[2]); | |
300 | Float_t ThetaChild=TMath::ATan2(PtChild,pc[2]); | |
301 | Float_t PhiChild=TMath::ATan2(pc[1],pc[0])+TMath::Pi(); | |
302 | Bool_t childok = | |
303 | ((PtChild > fPtMin && PtChild <fPtMax) && | |
304 | (PChild > fPMin && PChild <fPMax) && | |
305 | (ThetaChild>fThetaMin && ThetaChild<fThetaMax) && | |
306 | (PhiChild > fPhiMin && PhiChild <fPhiMax)); | |
307 | if(childok) | |
308 | { | |
309 | pch[ncsel][0]=pc[0]; | |
310 | pch[ncsel][1]=pc[1]; | |
311 | pch[ncsel][2]=pc[2]; | |
312 | kfch[ncsel]=kf; | |
313 | ncsel++; | |
314 | } else { | |
315 | ncsel=-1; | |
316 | break; | |
317 | } // child kine cuts | |
21aaa175 | 318 | } else { |
886b6f73 | 319 | pch[ncsel][0]=pc[0]; |
320 | pch[ncsel][1]=pc[1]; | |
321 | pch[ncsel][2]=pc[2]; | |
322 | kfch[ncsel]=kf; | |
323 | ncsel++; | |
324 | } // if child selection | |
325 | } // select muon | |
326 | } // decay particle loop | |
327 | Int_t iparent; | |
328 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
329 | ipa++; | |
21aaa175 | 330 | // |
331 | // parent | |
886b6f73 | 332 | gAlice-> |
333 | SetTrack(0,-1,Ipart,p,origin0,polar,0,"Primary",nt,wgtp); | |
334 | iparent=nt; | |
21aaa175 | 335 | |
886b6f73 | 336 | for (i=0; i< ncsel; i++) { |
337 | gAlice->SetTrack(fTrackIt,iparent,kfch[i], | |
338 | &pch[i][0],och,polar, | |
339 | 0,"Decay",nt,wgtch); | |
340 | gAlice->KeepTrack(nt); | |
341 | } | |
28337bc1 | 342 | } // Decays by Lujet |
21aaa175 | 343 | } // kinematic selection |
28337bc1 | 344 | else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons) |
345 | { | |
346 | gAlice-> | |
347 | SetTrack(fTrackIt,-1,Ipart,p,origin0,polar,0,"Primary",nt,wgtp); | |
348 | ipa++; | |
349 | } | |
fe4da5cc | 350 | break; |
21aaa175 | 351 | } // while |
fe4da5cc | 352 | } // event loop |
353 | } | |
354 | ||
355 | Bool_t AliGenParam::ChildSelected(Int_t ip) | |
356 | { | |
357 | for (Int_t i=0; i<5; i++) | |
358 | { | |
359 | if (fChildSelect[i]==ip) return kTRUE; | |
360 | } | |
361 | return kFALSE; | |
362 | } | |
363 | ||
1578254f | 364 | Bool_t AliGenParam::KinematicSelection(TParticle *particle) |
fe4da5cc | 365 | { |
1578254f | 366 | Float_t px=particle->Px(); |
367 | Float_t py=particle->Py(); | |
368 | Float_t pz=particle->Pz(); | |
fe4da5cc | 369 | // |
370 | // momentum cut | |
371 | Float_t p=TMath::Sqrt(px*px+py*py+pz*pz); | |
372 | if (p > fPMax || p < fPMin) | |
373 | { | |
374 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
375 | return kFALSE; | |
376 | } | |
377 | Float_t pt=TMath::Sqrt(px*px+py*py); | |
378 | ||
379 | // | |
380 | // theta cut | |
381 | Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p))); | |
382 | if (theta > fThetaMax || theta < fThetaMin) | |
383 | { | |
384 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
385 | return kFALSE; | |
386 | } | |
387 | ||
388 | return kTRUE; | |
389 | } | |
390 | ||
391 | ||
392 | ||
393 |