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1 | #include "AliGenParam.h" | |
2 | #include "AliGenMUONlib.h" | |
3 | #include "AliRun.h" | |
4 | #include "AliPythia.h" | |
5 | #include <TDirectory.h> | |
6 | #include <TFile.h> | |
7 | #include <TTree.h> | |
8 | #include <stdlib.h> | |
9 | #include <TParticle.h> | |
10 | ||
11 | ClassImp(AliGenParam) | |
12 | ||
13 | //------------------------------------------------------------ | |
14 | ||
15 | //Begin_Html | |
16 | /* | |
17 | <img src="picts/AliGenParam.gif"> | |
18 | */ | |
19 | //End_Html | |
20 | ||
21 | //____________________________________________________________ | |
22 | //____________________________________________________________ | |
23 | AliGenParam::AliGenParam() | |
24 | :AliGenerator() | |
25 | { | |
26 | fPtPara = 0; | |
27 | fYPara = 0; | |
28 | fParam = jpsi_p; | |
29 | fAnalog = analog; | |
30 | SetCutOnChild(); | |
31 | } | |
32 | ||
33 | //____________________________________________________________ | |
34 | AliGenParam::AliGenParam(Int_t npart, Param_t param) | |
35 | // Double_t (*PtPara)(Double_t*, Double_t*), | |
36 | // Double_t (*YPara) (Double_t* ,Double_t*)) | |
37 | :AliGenerator(npart) | |
38 | { | |
39 | // | |
40 | // fName="HMESONpara"; | |
41 | // fTitle="Heavy Mesons Parametrisation"; | |
42 | fPtParaFunc = AliGenMUONlib::GetPt(param); | |
43 | fYParaFunc = AliGenMUONlib::GetY(param); | |
44 | fIpParaFunc = AliGenMUONlib::GetIp(param); | |
45 | ||
46 | fPtPara = 0; | |
47 | fYPara = 0; | |
48 | fParam = param; | |
49 | fAnalog = analog; | |
50 | fChildSelect.Set(5); | |
51 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
52 | ForceDecay(); | |
53 | SetCutOnChild(); | |
54 | } | |
55 | ||
56 | //____________________________________________________________ | |
57 | AliGenParam::~AliGenParam() | |
58 | { | |
59 | delete fPtPara; | |
60 | delete fYPara; | |
61 | } | |
62 | ||
63 | //____________________________________________________________ | |
64 | void AliGenParam::Init() | |
65 | { | |
66 | SetMC(new AliPythia()); | |
67 | fPythia= (AliPythia*) fgMCEvGen; | |
68 | ||
69 | // End of the test !!! | |
70 | //Begin_Html | |
71 | /* | |
72 | <img src="picts/AliGenParam.gif"> | |
73 | */ | |
74 | //End_Html | |
75 | ||
76 | fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0); | |
77 | fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0); | |
78 | TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0); | |
79 | TF1* YPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0); | |
80 | ||
81 | // | |
82 | // dN/dy| y=0 | |
83 | Double_t y1=0; | |
84 | Double_t y2=0; | |
85 | ||
86 | fdNdy0=fYParaFunc(&y1,&y2); | |
87 | // | |
88 | // Integral over generation region | |
89 | Float_t IntYS = YPara ->Integral(fYMin, fYMax); | |
90 | Float_t IntPt0 = PtPara->Integral(0,15); | |
91 | Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax); | |
92 | Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi(); | |
93 | if (fAnalog) { | |
94 | fYWgt = IntYS/fdNdy0; | |
95 | fPtWgt = IntPtS/IntPt0; | |
96 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
97 | } else { | |
98 | fYWgt = IntYS/fdNdy0; | |
99 | fPtWgt = (fPtMax-fPtMin)/IntPt0; | |
100 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
101 | } | |
102 | // | |
103 | // particle decay related initialization | |
104 | fPythia->DefineParticles(); | |
105 | // semimuonic decays of charm and beauty | |
106 | fPythia->ForceDecay(fForceDecay); | |
107 | // | |
108 | switch (fForceDecay) | |
109 | { | |
110 | case semielectronic: | |
111 | case dielectron: | |
112 | case b_jpsi_dielectron: | |
113 | case b_psip_dielectron: | |
114 | fChildSelect[0]=11; | |
115 | break; | |
116 | case semimuonic: | |
117 | case dimuon: | |
118 | case b_jpsi_dimuon: | |
119 | case b_psip_dimuon: | |
120 | fChildSelect[0]=13; | |
121 | break; | |
122 | case pitomu: | |
123 | fChildSelect[0]=13; | |
124 | break; | |
125 | case katomu: | |
126 | fChildSelect[0]=13; | |
127 | break; | |
128 | } | |
129 | ||
130 | } | |
131 | ||
132 | //____________________________________________________________ | |
133 | void AliGenParam::Generate() | |
134 | { | |
135 | // Generate 'npart' of heavy mesons (J/Psi, upsilon or phi) in the | |
136 | // the desired theta, phi and momentum windows; Gaussian smearing | |
137 | // on the vertex is done if selected | |
138 | ||
139 | ||
140 | //printf("Generate !!!!!!!!!!!!!\n"); | |
141 | ||
142 | Float_t polar[3]= {0,0,0}; | |
143 | // | |
144 | Float_t origin[3], origin0[3]; | |
145 | Float_t pt, pl, ptot; | |
146 | Float_t phi, theta; | |
147 | Float_t p[3], pc[3], och[3], pch[10][3]; | |
148 | Float_t ty, xmt; | |
149 | Int_t nt, i, j, kfch[10]; | |
150 | Float_t wgtp, wgtch; | |
151 | Double_t dummy; | |
152 | static TClonesArray *particles; | |
153 | // | |
154 | if(!particles) particles=new TClonesArray("TParticle",1000); | |
155 | // | |
156 | Float_t random[6]; | |
157 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; | |
158 | if(fVertexSmear==perEvent) { | |
159 | gMC->Rndm(random,6); | |
160 | for (j=0;j<3;j++) { | |
161 | origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
162 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
163 | } | |
164 | } | |
165 | Int_t ipa=0; | |
166 | while (ipa<fNpart) { | |
167 | while(1) { | |
168 | // | |
169 | // particle type | |
170 | Int_t Ipart = fIpParaFunc(); | |
171 | fChildWeight=(fPythia->GetBraPart(Ipart))*fParentWeight; | |
172 | Float_t am=fPythia->GetPMAS(fPythia->LuComp(Ipart),1); | |
173 | gMC->Rndm(random,2); | |
174 | // | |
175 | // phi | |
176 | phi=fPhiMin+random[0]*(fPhiMax-fPhiMin); | |
177 | // | |
178 | // y | |
179 | ty=Float_t(TMath::TanH(fYPara->GetRandom())); | |
180 | // | |
181 | // pT | |
182 | if (fAnalog) { | |
183 | pt=fPtPara->GetRandom(); | |
184 | wgtp=fParentWeight; | |
185 | wgtch=fChildWeight; | |
186 | } else { | |
187 | pt=fPtMin+random[1]*(fPtMax-fPtMin); | |
188 | Double_t ptd=pt; | |
189 | wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy); | |
190 | wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy); | |
191 | } | |
192 | xmt=sqrt(pt*pt+am*am); | |
193 | pl=xmt*ty/sqrt(1.-ty*ty); | |
194 | theta=TMath::ATan2(pt,pl); | |
195 | if(theta<fThetaMin || theta>fThetaMax) continue; | |
196 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
197 | if(ptot<fPMin || ptot>fPMax) continue; | |
198 | p[0]=pt*TMath::Cos(phi); | |
199 | p[1]=pt*TMath::Sin(phi); | |
200 | p[2]=pl; | |
201 | if(fVertexSmear==perTrack) { | |
202 | gMC->Rndm(random,6); | |
203 | for (j=0;j<3;j++) { | |
204 | origin0[j]= | |
205 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
206 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
207 | } | |
208 | } | |
209 | // | |
210 | // use lujet to decay particle | |
211 | ||
212 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
213 | fPythia->DecayParticle(Ipart,energy,theta,phi); | |
214 | // fPythia->LuList(1); | |
215 | ||
216 | ||
217 | //printf("origin0 %f %f %f\n",origin0[0],origin0[1],origin0[2]); | |
218 | //printf("fCutOnChild %d \n",fCutOnChild); | |
219 | // | |
220 | // select muons | |
221 | Int_t np=fPythia->ImportParticles(particles,"All"); | |
222 | //printf("np %d \n",np); | |
223 | Int_t ncsel=0; | |
224 | for (i = 1; i<np; i++) { | |
225 | TParticle * iparticle = (TParticle *) particles->At(i); | |
226 | Int_t kf = iparticle->GetPdgCode(); | |
227 | //printf("kf %d\n",kf); | |
228 | // | |
229 | // children | |
230 | if (ChildSelected(TMath::Abs(kf))) | |
231 | { | |
232 | pc[0]=iparticle->Px(); | |
233 | pc[1]=iparticle->Py(); | |
234 | pc[2]=iparticle->Pz(); | |
235 | och[0]=origin0[0]+iparticle->Vx()/10; | |
236 | och[1]=origin0[1]+iparticle->Vy()/10; | |
237 | och[2]=origin0[2]+iparticle->Vz()/10; | |
238 | if (fCutOnChild) { | |
239 | Float_t PtChild=TMath::Sqrt(pc[0]*pc[0]+pc[1]*pc[1]); | |
240 | Float_t PChild=TMath::Sqrt(PtChild*PtChild+pc[2]*pc[2]); | |
241 | Float_t ThetaChild=TMath::ATan2(PtChild,pc[2]); | |
242 | Float_t PhiChild=TMath::ATan2(pc[1],pc[0])+TMath::Pi(); | |
243 | Bool_t childok = | |
244 | ((PtChild > fPtMin && PtChild <fPtMax) && | |
245 | (PChild > fPMin && PChild <fPMax) && | |
246 | (ThetaChild>fThetaMin && ThetaChild<fThetaMax) && | |
247 | (PhiChild > fPhiMin && PhiChild <fPhiMax)); | |
248 | if(childok) | |
249 | { | |
250 | pch[ncsel][0]=pc[0]; | |
251 | pch[ncsel][1]=pc[1]; | |
252 | pch[ncsel][2]=pc[2]; | |
253 | kfch[ncsel]=kf; | |
254 | ncsel++; | |
255 | } else { | |
256 | ncsel=-1; | |
257 | break; | |
258 | } // child kine cuts | |
259 | } else { | |
260 | pch[ncsel][0]=pc[0]; | |
261 | pch[ncsel][1]=pc[1]; | |
262 | pch[ncsel][2]=pc[2]; | |
263 | kfch[ncsel]=kf; | |
264 | ncsel++; | |
265 | } // if child selection | |
266 | } // select muon | |
267 | } // decay particle loop | |
268 | Int_t iparent; | |
269 | if ((fCutOnChild && ncsel >0) || !fCutOnChild){ | |
270 | ipa++; | |
271 | // | |
272 | // parent | |
273 | gAlice-> | |
274 | SetTrack(0,-1,Ipart,p,origin,polar,0,"Primary",nt,wgtp); | |
275 | iparent=nt; | |
276 | ||
277 | for (i=0; i< ncsel; i++) { | |
278 | gAlice->SetTrack(fTrackIt,iparent,kfch[i], | |
279 | &pch[i][0],och,polar, | |
280 | 0,"Decay",nt,wgtch); | |
281 | gAlice->KeepTrack(nt); | |
282 | } | |
283 | ||
284 | } // kinematic selection | |
285 | break; | |
286 | } // while | |
287 | } // event loop | |
288 | } | |
289 | ||
290 | Bool_t AliGenParam::ChildSelected(Int_t ip) | |
291 | { | |
292 | for (Int_t i=0; i<5; i++) | |
293 | { | |
294 | if (fChildSelect[i]==ip) return kTRUE; | |
295 | } | |
296 | return kFALSE; | |
297 | } | |
298 | ||
299 | Bool_t AliGenParam::KinematicSelection(TParticle *particle) | |
300 | { | |
301 | Float_t px=particle->Px(); | |
302 | Float_t py=particle->Py(); | |
303 | Float_t pz=particle->Pz(); | |
304 | // | |
305 | // momentum cut | |
306 | Float_t p=TMath::Sqrt(px*px+py*py+pz*pz); | |
307 | if (p > fPMax || p < fPMin) | |
308 | { | |
309 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
310 | return kFALSE; | |
311 | } | |
312 | Float_t pt=TMath::Sqrt(px*px+py*py); | |
313 | ||
314 | // | |
315 | // theta cut | |
316 | Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p))); | |
317 | if (theta > fThetaMax || theta < fThetaMin) | |
318 | { | |
319 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
320 | return kFALSE; | |
321 | } | |
322 | ||
323 | return kTRUE; | |
324 | } | |
325 | ||
326 | ||
327 | ||
328 |