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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 | ||
88cb7938 | 16 | /* $Id$ */ |
6d4dd317 | 17 | |
18 | // Class to generate particles from using paramtrized pT and y distributions. | |
19 | // Distributions are obtained from pointer to object of type AliGenLib. | |
20 | // (For example AliGenMUONlib) | |
21 | // Decays are performed using Pythia. | |
22 | // andreas.morsch@cern.ch | |
23 | ||
ac3faee4 | 24 | #include <TCanvas.h> |
7ca4655f | 25 | #include <TClonesArray.h> |
fa480368 | 26 | #include <TDatabasePDG.h> |
ac3faee4 | 27 | #include <TF1.h> |
28 | #include <TH1F.h> | |
fa480368 | 29 | #include <TLorentzVector.h> |
ac3faee4 | 30 | #include <TMath.h> |
31 | #include <TParticle.h> | |
32 | #include <TParticlePDG.h> | |
828fff0d | 33 | #include <TROOT.h> |
ac3faee4 | 34 | #include <TVirtualMC.h> |
fa480368 | 35 | |
ac3faee4 | 36 | #include "AliDecayer.h" |
37 | #include "AliGenMUONlib.h" | |
38 | #include "AliGenParam.h" | |
5d12ce38 | 39 | #include "AliMC.h" |
ac3faee4 | 40 | #include "AliRun.h" |
7cf36cae | 41 | #include "AliGenEventHeader.h" |
fe4da5cc | 42 | |
43 | ClassImp(AliGenParam) | |
44 | ||
45 | //------------------------------------------------------------ | |
46 | ||
6078e216 | 47 | //Begin_Html |
48 | /* | |
1439f98e | 49 | <img src="picts/AliGenParam.gif"> |
6078e216 | 50 | */ |
51 | //End_Html | |
fe4da5cc | 52 | |
fe4da5cc | 53 | //____________________________________________________________ |
6078e216 | 54 | AliGenParam::AliGenParam() |
55 | : fPtParaFunc(0), | |
1c56e311 | 56 | fYParaFunc(0), |
57 | fIpParaFunc(0), | |
6078e216 | 58 | fV2ParaFunc(0), |
1c56e311 | 59 | fPtPara(0), |
60 | fYPara(0), | |
6078e216 | 61 | fV2Para(0), |
62 | fdNdPhi(0), | |
1c56e311 | 63 | fParam(0), |
64 | fdNdy0(0.), | |
65 | fYWgt(0.), | |
66 | fPtWgt(0.), | |
67 | fBias(0.), | |
68 | fTrials(0), | |
69 | fDeltaPt(0.01), | |
18e09c20 | 70 | fSelectAll(kFALSE), |
4ae1c9f0 | 71 | fDecayer(0), |
72 | fForceConv(kFALSE) | |
fe4da5cc | 73 | { |
6078e216 | 74 | // Default constructor |
b22ee262 | 75 | } |
2ad38d56 | 76 | //____________________________________________________________ |
f2c13e03 | 77 | AliGenParam::AliGenParam(Int_t npart, const AliGenLib * Library, Int_t param, const char* tname) |
1c56e311 | 78 | :AliGenMC(npart), |
79 | fPtParaFunc(Library->GetPt(param, tname)), | |
80 | fYParaFunc (Library->GetY (param, tname)), | |
81 | fIpParaFunc(Library->GetIp(param, tname)), | |
6078e216 | 82 | fV2ParaFunc(Library->GetV2(param, tname)), |
1c56e311 | 83 | fPtPara(0), |
84 | fYPara(0), | |
6078e216 | 85 | fV2Para(0), |
86 | fdNdPhi(0), | |
1c56e311 | 87 | fParam(param), |
88 | fdNdy0(0.), | |
89 | fYWgt(0.), | |
90 | fPtWgt(0.), | |
91 | fBias(0.), | |
92 | fTrials(0), | |
93 | fDeltaPt(0.01), | |
18e09c20 | 94 | fSelectAll(kFALSE), |
4ae1c9f0 | 95 | fDecayer(0), |
96 | fForceConv(kFALSE) | |
b22ee262 | 97 | { |
6078e216 | 98 | // Constructor using number of particles parameterisation id and library |
8b31bfac | 99 | fName = "Param"; |
100 | fTitle= "Particle Generator using pT and y parameterisation"; | |
34f60c01 | 101 | fAnalog = kAnalog; |
b22ee262 | 102 | SetForceDecay(); |
fe4da5cc | 103 | } |
fe4da5cc | 104 | //____________________________________________________________ |
1c56e311 | 105 | AliGenParam::AliGenParam(Int_t npart, Int_t param, const char* tname, const char* name): |
106 | AliGenMC(npart), | |
107 | fPtParaFunc(0), | |
108 | fYParaFunc (0), | |
109 | fIpParaFunc(0), | |
6078e216 | 110 | fV2ParaFunc(0), |
1c56e311 | 111 | fPtPara(0), |
112 | fYPara(0), | |
6078e216 | 113 | fV2Para(0), |
114 | fdNdPhi(0), | |
1c56e311 | 115 | fParam(param), |
116 | fdNdy0(0.), | |
117 | fYWgt(0.), | |
118 | fPtWgt(0.), | |
119 | fBias(0.), | |
120 | fTrials(0), | |
121 | fDeltaPt(0.01), | |
18e09c20 | 122 | fSelectAll(kFALSE), |
4ae1c9f0 | 123 | fDecayer(0), |
124 | fForceConv(kFALSE) | |
fe4da5cc | 125 | { |
6078e216 | 126 | // Constructor using parameterisation id and number of particles |
127 | // | |
1c56e311 | 128 | fName = name; |
129 | fTitle= "Particle Generator using pT and y parameterisation"; | |
8b31bfac | 130 | |
675e9664 | 131 | AliGenLib* pLibrary = new AliGenMUONlib(); |
675e9664 | 132 | fPtParaFunc = pLibrary->GetPt(param, tname); |
133 | fYParaFunc = pLibrary->GetY (param, tname); | |
134 | fIpParaFunc = pLibrary->GetIp(param, tname); | |
6078e216 | 135 | fV2ParaFunc = pLibrary->GetV2(param, tname); |
b22ee262 | 136 | |
34f60c01 | 137 | fAnalog = kAnalog; |
b22ee262 | 138 | fChildSelect.Set(5); |
139 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
140 | SetForceDecay(); | |
141 | SetCutOnChild(); | |
142 | SetChildMomentumRange(); | |
143 | SetChildPtRange(); | |
144 | SetChildPhiRange(); | |
145 | SetChildThetaRange(); | |
fe4da5cc | 146 | } |
2ad38d56 | 147 | //____________________________________________________________ |
fe4da5cc | 148 | |
34f60c01 | 149 | AliGenParam::AliGenParam(Int_t npart, Int_t param, |
75e0cc59 | 150 | Double_t (*PtPara) (const Double_t*, const Double_t*), |
151 | Double_t (*YPara ) (const Double_t* ,const Double_t*), | |
6078e216 | 152 | Double_t (*V2Para) (const Double_t* ,const Double_t*), |
65fb704d | 153 | Int_t (*IpPara) (TRandom *)) |
1c56e311 | 154 | :AliGenMC(npart), |
155 | ||
156 | fPtParaFunc(PtPara), | |
157 | fYParaFunc(YPara), | |
158 | fIpParaFunc(IpPara), | |
6078e216 | 159 | fV2ParaFunc(V2Para), |
1c56e311 | 160 | fPtPara(0), |
161 | fYPara(0), | |
6078e216 | 162 | fV2Para(0), |
163 | fdNdPhi(0), | |
1c56e311 | 164 | fParam(param), |
165 | fdNdy0(0.), | |
166 | fYWgt(0.), | |
167 | fPtWgt(0.), | |
168 | fBias(0.), | |
169 | fTrials(0), | |
170 | fDeltaPt(0.01), | |
18e09c20 | 171 | fSelectAll(kFALSE), |
4ae1c9f0 | 172 | fDecayer(0), |
173 | fForceConv(kFALSE) | |
886b6f73 | 174 | { |
6078e216 | 175 | // Constructor |
176 | // Gines Martinez 1/10/99 | |
8b31bfac | 177 | fName = "Param"; |
178 | fTitle= "Particle Generator using pT and y parameterisation"; | |
179 | ||
34f60c01 | 180 | fAnalog = kAnalog; |
886b6f73 | 181 | fChildSelect.Set(5); |
182 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
183 | SetForceDecay(); | |
184 | SetCutOnChild(); | |
749070b6 | 185 | SetChildMomentumRange(); |
186 | SetChildPtRange(); | |
187 | SetChildPhiRange(); | |
188 | SetChildThetaRange(); | |
886b6f73 | 189 | } |
190 | ||
fe4da5cc | 191 | //____________________________________________________________ |
192 | AliGenParam::~AliGenParam() | |
193 | { | |
6078e216 | 194 | // Destructor |
fe4da5cc | 195 | delete fPtPara; |
196 | delete fYPara; | |
6078e216 | 197 | delete fV2Para; |
198 | delete fdNdPhi; | |
fe4da5cc | 199 | } |
200 | ||
4ae1c9f0 | 201 | //------------------------------------------------------------------- |
202 | TVector3 AliGenParam::OrthogonalVector(TVector3 &inVec){ | |
203 | double abc[]={inVec.x(), inVec.y(), inVec.z()}; | |
204 | double xyz[]={1,1,1}; | |
205 | int solvDim=0; | |
206 | double tmp=abc[0]; | |
207 | for(int i=0; i<3; i++) | |
208 | if(abs(abc[i])>tmp){ | |
209 | solvDim=i; | |
210 | tmp=abs(abc[i]); | |
211 | } | |
212 | xyz[solvDim]=(-abc[(1+solvDim)%3]-abc[(2+solvDim)%3])/abc[(0+solvDim)%3]; | |
213 | ||
214 | TVector3 res(xyz[0],xyz[1],xyz[2]); | |
215 | return res; | |
216 | } | |
217 | ||
218 | double AliGenParam::ScreenFunc1(double d){ | |
219 | if(d>1) | |
220 | return 21.12-4.184*log(d+0.952); | |
221 | else | |
222 | return 20.867-3.242*d+0.652*d*d; | |
223 | } | |
224 | ||
225 | double AliGenParam::ScreenFunc2(double d){ | |
226 | if(d>1) | |
227 | return 21.12-4.184*log(d+0.952); | |
228 | else | |
229 | return 20.209-1.93*d-0.086*d*d; | |
230 | } | |
231 | ||
232 | double AliGenParam::EnergyFraction(double Z, double E){ | |
233 | double e0=0.000511/E; | |
234 | double aZ=Z/137.036; | |
235 | double dmin=ScreenVar(Z,e0,0.5); | |
236 | double fcZ=(aZ*aZ)*(1/(1+aZ*aZ)+0.20206-0.0368*aZ*aZ+0.0083*aZ*aZ*aZ); | |
237 | double Fz=8*log(Z)/3; | |
238 | if(E>0.05) | |
239 | Fz+=8*fcZ; | |
240 | double dmax=exp((42.24-Fz)/8.368)-0.952; | |
241 | if(!(dmax>dmin)) | |
242 | return fRandom->Uniform(e0,0.5); | |
243 | ||
244 | double e1=0.5-0.5*sqrt(1-dmin/dmax); | |
245 | double emin=TMath::Max(e0,e1); | |
246 | ||
247 | double normval=1/(0.5*(ScreenFunc1(dmin)-0.5*Fz)+0.1666667*(ScreenFunc2(dmin)-0.5*Fz)); | |
248 | while(true){ | |
249 | double y=fRandom->Uniform(emin,1); | |
250 | double eps=y*(0.38453+y*(0.10234+y*(0.026072+y*(0.014367-0.027313*y)))); //inverse to the enveloping cumulative probability distribution | |
251 | double val=fRandom->Uniform(0,2.12*(eps*eps-eps)+1.53); //enveloping probability density | |
252 | double d=ScreenVar(Z,e0,eps); | |
253 | double bh=((eps*eps)+(1-eps)*(1-eps))*(ScreenFunc1(d)-0.5*Fz)+0.6666667*eps*(1-eps)*(ScreenFunc2(d)-0.5*Fz); | |
254 | bh*=normval; | |
255 | if(val<bh) | |
256 | return eps; | |
257 | } | |
258 | } | |
259 | ||
260 | double AliGenParam::PolarAngle(double E){ | |
261 | float rand[3]; | |
262 | AliRndm rndm; | |
263 | rndm.Rndm(rand,3); | |
264 | double u=-8*log(rand[1]*rand[2])/5; | |
265 | if(!(rand[0]<9.0/36)) | |
266 | u/=3; | |
267 | return u*0.000511/E; | |
268 | } | |
269 | ||
270 | Int_t AliGenParam::ForceGammaConversion(TClonesArray *particles, Int_t nPart) | |
271 | { | |
272 | //based on: http://geant4.cern.ch/G4UsersDocuments/UsersGuides/PhysicsReferenceManual/html/node27.html | |
273 | // and: http://geant4.cern.ch/G4UsersDocuments/UsersGuides/PhysicsReferenceManual/html/node58.html | |
274 | Int_t nPartNew=nPart; | |
275 | for(int iPart=0; iPart<nPart; iPart++){ | |
276 | TParticle *gamma = (TParticle *) particles->At(iPart); | |
277 | if(gamma->GetPdgCode()!=22) continue; | |
278 | ||
279 | TVector3 gammaV3(gamma->Px(),gamma->Py(),gamma->Pz()); | |
280 | Float_t az=fRandom->Uniform(TMath::Pi()*2); | |
281 | double frac=EnergyFraction(1,gamma->Energy()); | |
282 | double Ee1=frac*gamma->Energy(); | |
283 | double Ee2=(1-frac)*gamma->Energy(); | |
284 | double Pe1=Ee1;//sqrt(Ee1*Ee1-0.000511*0.000511); | |
285 | double Pe2=Ee2;//sqrt(Ee2*Ee2-0.000511*0.000511); | |
286 | ||
287 | TVector3 rotAxis(OrthogonalVector(gammaV3)); | |
288 | rotAxis.Rotate(az,gammaV3); | |
289 | TVector3 e1V3(gammaV3); | |
290 | e1V3.Rotate(PolarAngle(Ee1),rotAxis); | |
291 | e1V3=e1V3.Unit(); | |
292 | e1V3*=Pe1; | |
293 | TVector3 e2V3(gammaV3); | |
294 | e2V3.Rotate(-PolarAngle(Ee2),rotAxis); | |
295 | e2V3=e2V3.Unit(); | |
296 | e2V3*=Pe2; | |
297 | // gamma = new TParticle(*gamma); | |
298 | // particles->RemoveAt(iPart); | |
299 | gamma->SetFirstDaughter(nPartNew+1); | |
300 | gamma->SetLastDaughter(nPartNew+2); | |
301 | // new((*particles)[iPart]) TParticle(*gamma); | |
302 | // delete gamma; | |
303 | ||
304 | TLorentzVector vtx; | |
305 | gamma->ProductionVertex(vtx); | |
306 | new((*particles)[nPartNew]) TParticle(11, gamma->GetStatusCode(), iPart+1, -1, 0, 0, TLorentzVector(e1V3,Ee1), vtx); | |
307 | nPartNew++; | |
308 | new((*particles)[nPartNew]) TParticle(-11, gamma->GetStatusCode(), iPart+1, -1, 0, 0, TLorentzVector(e2V3,Ee2), vtx); | |
309 | nPartNew++; | |
310 | } | |
311 | // particles->Compress(); | |
312 | return particles->GetEntriesFast(); | |
313 | } | |
314 | ||
fe4da5cc | 315 | //____________________________________________________________ |
316 | void AliGenParam::Init() | |
317 | { | |
6078e216 | 318 | // Initialisation |
fa480368 | 319 | |
2904363f | 320 | if (gMC) fDecayer = gMC->GetDecayer(); |
fe4da5cc | 321 | //Begin_Html |
322 | /* | |
1439f98e | 323 | <img src="picts/AliGenParam.gif"> |
fe4da5cc | 324 | */ |
325 | //End_Html | |
c5c3e4b0 | 326 | char name[256]; |
8f8399ab | 327 | snprintf(name, 256, "pt-parameterisation for %s", GetName()); |
c5c3e4b0 | 328 | |
2ad38d56 | 329 | if (fPtPara) fPtPara->Delete(); |
c5c3e4b0 | 330 | fPtPara = new TF1(name, fPtParaFunc, fPtMin, fPtMax,0); |
828fff0d | 331 | gROOT->GetListOfFunctions()->Remove(fPtPara); |
6078e216 | 332 | // Set representation precision to 10 MeV |
c5c3e4b0 | 333 | Int_t npx= Int_t((fPtMax - fPtMin) / fDeltaPt); |
749070b6 | 334 | |
335 | fPtPara->SetNpx(npx); | |
c5c3e4b0 | 336 | |
8f8399ab | 337 | snprintf(name, 256, "y-parameterisation for %s", GetName()); |
2ad38d56 | 338 | if (fYPara) fYPara->Delete(); |
c5c3e4b0 | 339 | fYPara = new TF1(name, fYParaFunc, fYMin, fYMax, 0); |
828fff0d | 340 | gROOT->GetListOfFunctions()->Remove(fYPara); |
341 | ||
6078e216 | 342 | snprintf(name, 256, "v2-parameterisation for %s", GetName()); |
343 | if (fV2Para) fV2Para->Delete(); | |
344 | fV2Para = new TF1(name, fV2ParaFunc, fPtMin, fPtMax, 0); | |
345 | // fV2Para = new TF1(name, "2*[0]/(1+TMath::Exp([1]*([2]-x)))-[0]", fPtMin, fPtMax); | |
346 | // fV2Para->SetParameter(0, 0.236910); | |
347 | // fV2Para->SetParameter(1, 1.71122); | |
348 | // fV2Para->SetParameter(2, 0.0827617); | |
349 | //gROOT->GetListOfFunctions()->Remove(fV2Para); //TR: necessary? | |
350 | ||
351 | snprintf(name, 256, "dNdPhi for %s", GetName()); | |
352 | if (fdNdPhi) fdNdPhi->Delete(); | |
353 | fdNdPhi = new TF1(name, "1+2*[0]*TMath::Cos(2*(x-[1]))", fPhiMin, fPhiMax); | |
354 | //gROOT->GetListOfFunctions()->Remove(fdNdPhi); //TR: necessary? | |
749070b6 | 355 | |
8f8399ab | 356 | snprintf(name, 256, "pt-for-%s", GetName()); |
c5c3e4b0 | 357 | TF1 ptPara(name ,fPtParaFunc, 0, 15, 0); |
8f8399ab | 358 | snprintf(name, 256, "y-for-%s", GetName()); |
c5c3e4b0 | 359 | TF1 yPara(name, fYParaFunc, -6, 6, 0); |
b7601ac4 | 360 | |
6078e216 | 361 | // |
362 | // dN/dy| y=0 | |
749070b6 | 363 | Double_t y1=0; |
364 | Double_t y2=0; | |
365 | ||
366 | fdNdy0=fYParaFunc(&y1,&y2); | |
6078e216 | 367 | // |
368 | // Integral over generation region | |
faf00b0d | 369 | #if ROOT_VERSION_CODE < ROOT_VERSION(5,99,0) |
389a9124 | 370 | Float_t intYS = yPara.Integral(fYMin, fYMax,(Double_t*) 0x0,1.e-6); |
371 | Float_t intPt0 = ptPara.Integral(0,15,(Double_t *) 0x0,1.e-6); | |
372 | Float_t intPtS = ptPara.Integral(fPtMin,fPtMax,(Double_t*) 0x0,1.e-6); | |
faf00b0d | 373 | #else |
374 | Float_t intYS = yPara.Integral(fYMin, fYMax,1.e-6); | |
375 | Float_t intPt0 = ptPara.Integral(0,15,1.e-6); | |
376 | Float_t intPtS = ptPara.Integral(fPtMin,fPtMax,1.e-6); | |
377 | #endif | |
6078e216 | 378 | Float_t phiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi(); //TR: should probably be done differently in case of anisotropic phi... |
34f60c01 | 379 | if (fAnalog == kAnalog) { |
749070b6 | 380 | fYWgt = intYS/fdNdy0; |
381 | fPtWgt = intPtS/intPt0; | |
382 | fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart; | |
383 | } else { | |
384 | fYWgt = intYS/fdNdy0; | |
385 | fPtWgt = (fPtMax-fPtMin)/intPt0; | |
386 | fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart; | |
387 | } | |
6078e216 | 388 | // |
389 | // particle decay related initialization | |
00d6ce7d | 390 | fDecayer->SetForceDecay(fForceDecay); |
fa480368 | 391 | fDecayer->Init(); |
00d6ce7d | 392 | |
6078e216 | 393 | // |
fff02fee | 394 | AliGenMC::Init(); |
fe4da5cc | 395 | } |
396 | ||
397 | //____________________________________________________________ | |
398 | void AliGenParam::Generate() | |
399 | { | |
d5615b85 | 400 | // |
401 | // Generate 1 event (see Generate(Int_t ntimes) for details | |
6078e216 | 402 | // |
d5615b85 | 403 | GenerateN(1); |
404 | } | |
405 | //____________________________________________________________ | |
406 | void AliGenParam::GenerateN(Int_t ntimes) | |
407 | { | |
408 | // | |
409 | // Generate ntimes*'npart' light and heavy mesons (J/Psi, upsilon or phi, Pion, | |
6078e216 | 410 | // Kaons, Etas, Omegas) and Baryons (proton, antiprotons, neutrons and |
411 | // antineutrons in the the desired theta, phi and momentum windows; | |
412 | // Gaussian smearing on the vertex is done if selected. | |
413 | // The decay of heavy mesons is done using lujet, | |
414 | // and the childern particle are tracked by GEANT | |
415 | // However, light mesons are directly tracked by GEANT | |
416 | // setting fForceDecay = nodecay (SetForceDecay(nodecay)) | |
417 | // | |
418 | // | |
419 | // Reinitialize decayer | |
2ad38d56 | 420 | fDecayer->SetForceDecay(fForceDecay); |
421 | fDecayer->Init(); | |
422 | ||
6078e216 | 423 | // |
28337bc1 | 424 | Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking) |
425 | Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking) | |
21391258 | 426 | Float_t time0; // Time0 of the generated parent particle |
28337bc1 | 427 | Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle |
428 | Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum | |
429 | Float_t p[3], pc[3], | |
fff02fee | 430 | och[3]; // Momentum, polarisation and origin of the children particles from lujet |
2d7a47be | 431 | Double_t ty, xmt; |
fff02fee | 432 | Int_t nt, i, j; |
fe4da5cc | 433 | Float_t wgtp, wgtch; |
434 | Double_t dummy; | |
09fd3ea2 | 435 | static TClonesArray *particles; |
fe4da5cc | 436 | // |
fff02fee | 437 | if(!particles) particles = new TClonesArray("TParticle",1000); |
8b31bfac | 438 | |
349be858 | 439 | TDatabasePDG *pDataBase = TDatabasePDG::Instance(); |
fe4da5cc | 440 | // |
441 | Float_t random[6]; | |
28337bc1 | 442 | |
6078e216 | 443 | // Calculating vertex position per event |
fe4da5cc | 444 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; |
21391258 | 445 | time0 = fTimeOrigin; |
aee8290b | 446 | if(fVertexSmear==kPerEvent) { |
d9ea0e3b | 447 | Vertex(); |
448 | for (j=0;j<3;j++) origin0[j]=fVertex[j]; | |
21391258 | 449 | time0 = fTime; |
fe4da5cc | 450 | } |
d9ea0e3b | 451 | |
21aaa175 | 452 | Int_t ipa=0; |
fff02fee | 453 | |
6078e216 | 454 | // Generating fNpart particles |
7cf36cae | 455 | fNprimaries = 0; |
456 | ||
d5615b85 | 457 | Int_t nGen = fNpart*ntimes; |
458 | while (ipa<nGen) { | |
cc5d764c | 459 | while(1) { |
6078e216 | 460 | // |
461 | // particle type | |
65fb704d | 462 | Int_t iPart = fIpParaFunc(fRandom); |
fa480368 | 463 | fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight; |
675e9664 | 464 | TParticlePDG *particle = pDataBase->GetParticle(iPart); |
fa480368 | 465 | Float_t am = particle->Mass(); |
8b31bfac | 466 | |
65fb704d | 467 | Rndm(random,2); |
6078e216 | 468 | // |
469 | // y | |
2d7a47be | 470 | ty = TMath::TanH(fYPara->GetRandom()); |
6078e216 | 471 | // |
472 | // pT | |
34f60c01 | 473 | if (fAnalog == kAnalog) { |
fe4da5cc | 474 | pt=fPtPara->GetRandom(); |
475 | wgtp=fParentWeight; | |
476 | wgtch=fChildWeight; | |
477 | } else { | |
478 | pt=fPtMin+random[1]*(fPtMax-fPtMin); | |
479 | Double_t ptd=pt; | |
480 | wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy); | |
481 | wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy); | |
482 | } | |
483 | xmt=sqrt(pt*pt+am*am); | |
2d7a47be | 484 | if (TMath::Abs(ty)==1.) { |
485 | ty=0.; | |
486 | Fatal("AliGenParam", | |
487 | "Division by 0: Please check you rapidity range !"); | |
488 | } | |
6078e216 | 489 | // |
490 | // phi | |
4ae1c9f0 | 491 | // if(!ipa) |
492 | //phi=fEvPlane; //align first particle of each event with event plane | |
493 | //else{ | |
6078e216 | 494 | double v2 = fV2Para->Eval(pt); |
495 | fdNdPhi->SetParameter(0,v2); | |
496 | fdNdPhi->SetParameter(1,fEvPlane); | |
497 | phi=fdNdPhi->GetRandom(); | |
4ae1c9f0 | 498 | // } |
2d7a47be | 499 | |
60e55aee | 500 | pl=xmt*ty/sqrt((1.-ty)*(1.+ty)); |
fe4da5cc | 501 | theta=TMath::ATan2(pt,pl); |
6078e216 | 502 | // Cut on theta |
fe4da5cc | 503 | if(theta<fThetaMin || theta>fThetaMax) continue; |
504 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
6078e216 | 505 | // Cut on momentum |
fe4da5cc | 506 | if(ptot<fPMin || ptot>fPMax) continue; |
6078e216 | 507 | // |
fe4da5cc | 508 | p[0]=pt*TMath::Cos(phi); |
509 | p[1]=pt*TMath::Sin(phi); | |
510 | p[2]=pl; | |
aee8290b | 511 | if(fVertexSmear==kPerTrack) { |
65fb704d | 512 | Rndm(random,6); |
fe4da5cc | 513 | for (j=0;j<3;j++) { |
514 | origin0[j]= | |
515 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
516 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
517 | } | |
21391258 | 518 | Rndm(random,2); |
519 | time0 = fTimeOrigin + fOsigma[2]/TMath::Ccgs()* | |
520 | TMath::Cos(2*random[0]*TMath::Pi())* | |
521 | TMath::Sqrt(-2*TMath::Log(random[1])); | |
fe4da5cc | 522 | } |
28337bc1 | 523 | |
6078e216 | 524 | // Looking at fForceDecay : |
525 | // if fForceDecay != none Primary particle decays using | |
526 | // AliPythia and children are tracked by GEANT | |
527 | // | |
528 | // if fForceDecay == none Primary particle is tracked by GEANT | |
529 | // (In the latest, make sure that GEANT actually does all the decays you want) | |
530 | // | |
cd716030 | 531 | Bool_t decayed = kFALSE; |
532 | ||
fff02fee | 533 | |
34f60c01 | 534 | if (fForceDecay != kNoDecay) { |
6078e216 | 535 | // Using lujet to decay particle |
886b6f73 | 536 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); |
fa480368 | 537 | TLorentzVector pmom(p[0], p[1], p[2], energy); |
538 | fDecayer->Decay(iPart,&pmom); | |
6078e216 | 539 | // |
540 | // select decay particles | |
fa480368 | 541 | Int_t np=fDecayer->ImportParticles(particles); |
1242532d | 542 | |
4ae1c9f0 | 543 | if(fForceConv) np=ForceGammaConversion(particles,np); |
544 | ||
545 | // for(int iPart=0; iPart<np; iPart++){ | |
546 | // TParticle *gamma = (TParticle *) particles->At(iPart); | |
547 | // printf("%i %i:", iPart, gamma->GetPdgCode()); | |
548 | // printf("%i %i %i|",gamma->GetFirstMother(),gamma->GetFirstDaughter(),gamma->GetLastDaughter()); | |
549 | // } | |
550 | ||
1242532d | 551 | // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut; |
552 | if (fGeometryAcceptance) | |
553 | if (!CheckAcceptanceGeometry(np,particles)) continue; | |
886b6f73 | 554 | Int_t ncsel=0; |
fff02fee | 555 | Int_t* pFlag = new Int_t[np]; |
556 | Int_t* pParent = new Int_t[np]; | |
557 | Int_t* pSelected = new Int_t[np]; | |
558 | Int_t* trackIt = new Int_t[np]; | |
559 | ||
560 | for (i=0; i<np; i++) { | |
561 | pFlag[i] = 0; | |
562 | pSelected[i] = 0; | |
563 | pParent[i] = -1; | |
564 | } | |
565 | ||
6ba00c52 | 566 | if (np >1) { |
cd716030 | 567 | decayed = kTRUE; |
08bffa4d | 568 | TParticle* iparticle = 0; |
fff02fee | 569 | Int_t ipF, ipL; |
570 | for (i = 1; i<np ; i++) { | |
571 | trackIt[i] = 1; | |
6ba00c52 | 572 | iparticle = (TParticle *) particles->At(i); |
573 | Int_t kf = iparticle->GetPdgCode(); | |
fff02fee | 574 | Int_t ks = iparticle->GetStatusCode(); |
6078e216 | 575 | // flagged particle |
fff02fee | 576 | |
577 | if (pFlag[i] == 1) { | |
fff02fee | 578 | ipF = iparticle->GetFirstDaughter(); |
579 | ipL = iparticle->GetLastDaughter(); | |
580 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
581 | continue; | |
582 | } | |
583 | ||
6078e216 | 584 | // flag decay products of particles with long life-time (c tau > .3 mum) |
fff02fee | 585 | |
586 | if (ks != 1) { | |
6078e216 | 587 | // TParticlePDG *particle = pDataBase->GetParticle(kf); |
fff02fee | 588 | |
589 | Double_t lifeTime = fDecayer->GetLifetime(kf); | |
6078e216 | 590 | // Double_t mass = particle->Mass(); |
591 | // Double_t width = particle->Width(); | |
47fc6bd5 | 592 | if (lifeTime > (Double_t) fMaxLifeTime) { |
fff02fee | 593 | ipF = iparticle->GetFirstDaughter(); |
594 | ipL = iparticle->GetLastDaughter(); | |
595 | if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1; | |
596 | } else{ | |
597 | trackIt[i] = 0; | |
598 | pSelected[i] = 1; | |
599 | } | |
600 | } // ks==1 ? | |
6078e216 | 601 | // |
602 | // children | |
47fc6bd5 | 603 | |
18e09c20 | 604 | if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll || fSelectAll) && trackIt[i]) |
6ba00c52 | 605 | { |
6ba00c52 | 606 | if (fCutOnChild) { |
fff02fee | 607 | pc[0]=iparticle->Px(); |
608 | pc[1]=iparticle->Py(); | |
609 | pc[2]=iparticle->Pz(); | |
610 | Bool_t childok = KinematicSelection(iparticle, 1); | |
611 | if(childok) { | |
612 | pSelected[i] = 1; | |
6ba00c52 | 613 | ncsel++; |
614 | } else { | |
615 | ncsel=-1; | |
616 | break; | |
617 | } // child kine cuts | |
618 | } else { | |
fff02fee | 619 | pSelected[i] = 1; |
886b6f73 | 620 | ncsel++; |
6ba00c52 | 621 | } // if child selection |
622 | } // select muon | |
623 | } // decay particle loop | |
624 | } // if decay products | |
625 | ||
886b6f73 | 626 | Int_t iparent; |
627 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
628 | ipa++; | |
6078e216 | 629 | // |
630 | // Parent | |
cd716030 | 631 | |
632 | ||
21391258 | 633 | PushTrack(0, -1, iPart, p, origin0, polar, time0, kPPrimary, nt, wgtp, ((decayed)? 11 : 1)); |
fff02fee | 634 | pParent[0] = nt; |
a99cf51f | 635 | KeepTrack(nt); |
7cf36cae | 636 | fNprimaries++; |
637 | ||
6078e216 | 638 | // |
639 | // Decay Products | |
640 | // | |
fff02fee | 641 | for (i = 1; i < np; i++) { |
642 | if (pSelected[i]) { | |
643 | TParticle* iparticle = (TParticle *) particles->At(i); | |
ea79897e | 644 | Int_t kf = iparticle->GetPdgCode(); |
cd716030 | 645 | Int_t ksc = iparticle->GetStatusCode(); |
ea79897e | 646 | Int_t jpa = iparticle->GetFirstMother()-1; |
fff02fee | 647 | |
774ceaaf | 648 | och[0] = origin0[0]+iparticle->Vx(); |
649 | och[1] = origin0[1]+iparticle->Vy(); | |
650 | och[2] = origin0[2]+iparticle->Vz(); | |
fff02fee | 651 | pc[0] = iparticle->Px(); |
652 | pc[1] = iparticle->Py(); | |
653 | pc[2] = iparticle->Pz(); | |
654 | ||
ea79897e | 655 | if (jpa > -1) { |
656 | iparent = pParent[jpa]; | |
fff02fee | 657 | } else { |
658 | iparent = -1; | |
659 | } | |
1242532d | 660 | |
ea79897e | 661 | PushTrack(fTrackIt * trackIt[i], iparent, kf, |
fff02fee | 662 | pc, och, polar, |
21391258 | 663 | time0 + iparticle->T(), kPDecay, nt, wgtch, ksc); |
fff02fee | 664 | pParent[i] = nt; |
a99cf51f | 665 | KeepTrack(nt); |
7cf36cae | 666 | fNprimaries++; |
8b31bfac | 667 | } // Selected |
668 | } // Particle loop | |
28337bc1 | 669 | } // Decays by Lujet |
8b31bfac | 670 | particles->Clear(); |
fff02fee | 671 | if (pFlag) delete[] pFlag; |
672 | if (pParent) delete[] pParent; | |
673 | if (pSelected) delete[] pSelected; | |
8b31bfac | 674 | if (trackIt) delete[] trackIt; |
21aaa175 | 675 | } // kinematic selection |
28337bc1 | 676 | else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons) |
677 | { | |
5d12ce38 | 678 | gAlice->GetMCApp()-> |
21391258 | 679 | PushTrack(fTrackIt,-1,iPart,p,origin0,polar,time0,kPPrimary,nt,wgtp, 1); |
28337bc1 | 680 | ipa++; |
7cf36cae | 681 | fNprimaries++; |
28337bc1 | 682 | } |
fe4da5cc | 683 | break; |
21aaa175 | 684 | } // while |
fe4da5cc | 685 | } // event loop |
7cf36cae | 686 | |
a99cf51f | 687 | SetHighWaterMark(nt); |
7cf36cae | 688 | |
689 | AliGenEventHeader* header = new AliGenEventHeader("PARAM"); | |
690 | header->SetPrimaryVertex(fVertex); | |
21391258 | 691 | header->SetInteractionTime(fTime); |
7cf36cae | 692 | header->SetNProduced(fNprimaries); |
693 | AddHeader(header); | |
fe4da5cc | 694 | } |
2ad38d56 | 695 | //____________________________________________________________________________________ |
696 | Float_t AliGenParam::GetRelativeArea(Float_t ptMin, Float_t ptMax, Float_t yMin, Float_t yMax, Float_t phiMin, Float_t phiMax) | |
697 | { | |
6078e216 | 698 | // |
699 | // Normalisation for selected kinematic region | |
700 | // | |
faf00b0d | 701 | #if ROOT_VERSION_CODE < ROOT_VERSION(5,99,0) |
2ad38d56 | 702 | Float_t ratio = |
389a9124 | 703 | fPtPara->Integral(ptMin,ptMax,(Double_t *)0,1.e-6) / fPtPara->Integral( fPtPara->GetXmin(), fPtPara->GetXmax(),(Double_t *)0,1.e-6) * |
704 | fYPara->Integral(yMin,yMax,(Double_t *)0,1.e-6)/fYPara->Integral(fYPara->GetXmin(),fYPara->GetXmax(),(Double_t *)0,1.e-6) * | |
2ad38d56 | 705 | (phiMax-phiMin)/360.; |
faf00b0d | 706 | #else |
707 | Float_t ratio = | |
708 | fPtPara->Integral(ptMin,ptMax,1.e-6) / fPtPara->Integral( fPtPara->GetXmin(), fPtPara->GetXmax(),1.e-6) * | |
709 | fYPara->Integral(yMin,yMax,1.e-6)/fYPara->Integral(fYPara->GetXmin(),fYPara->GetXmax(),1.e-6) * | |
710 | (phiMax-phiMin)/360.; | |
711 | #endif | |
2ad38d56 | 712 | return TMath::Abs(ratio); |
713 | } | |
714 | ||
715 | //____________________________________________________________________________________ | |
fe4da5cc | 716 | |
dc1d768c | 717 | void AliGenParam::Draw( const char * /*opt*/) |
5bd39445 | 718 | { |
719 | // | |
720 | // Draw the pT and y Distributions | |
721 | // | |
722 | TCanvas *c0 = new TCanvas("c0","Canvas 0",400,10,600,700); | |
723 | c0->Divide(2,1); | |
724 | c0->cd(1); | |
725 | fPtPara->Draw(); | |
726 | fPtPara->GetHistogram()->SetXTitle("p_{T} (GeV)"); | |
727 | c0->cd(2); | |
728 | fYPara->Draw(); | |
729 | fYPara->GetHistogram()->SetXTitle("y"); | |
730 | } | |
731 | ||
f87cfe57 | 732 | |
fe4da5cc | 733 | |
734 |