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fe4da5cc | 1 | #include "AliGenParam.h" |
2 | #include "AliGenMUONlib.h" | |
3 | #include "AliRun.h" | |
4 | #include "TGeant3.h" | |
5 | #include "AliPythia.h" | |
6 | #include <TDirectory.h> | |
7 | #include <TFile.h> | |
8 | #include <TTree.h> | |
9 | #include <stdlib.h> | |
10 | #include <TMCParticle.h> | |
11 | ||
12 | ClassImp(AliGenParam) | |
13 | ||
14 | //------------------------------------------------------------ | |
15 | ||
16 | //Begin_Html | |
17 | /* | |
18 | <img src="gif/AliGenParam.gif"> | |
19 | */ | |
20 | //End_Html | |
21 | ||
22 | //____________________________________________________________ | |
23 | //____________________________________________________________ | |
24 | AliGenParam::AliGenParam() | |
25 | :AliGenerator() | |
26 | { | |
27 | fPtPara = 0; | |
28 | fYPara = 0; | |
b7601ac4 | 29 | fParam = jpsi_p; |
30 | fAnalog = analog; | |
fe4da5cc | 31 | } |
32 | ||
33 | //____________________________________________________________ | |
b7601ac4 | 34 | AliGenParam::AliGenParam(Int_t npart, Param_t param) |
fe4da5cc | 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"; | |
b7601ac4 | 42 | fPtParaFunc = AliGenMUONlib::GetPt(param); |
43 | fYParaFunc = AliGenMUONlib::GetY(param); | |
44 | fIpParaFunc = AliGenMUONlib::GetIp(param); | |
fe4da5cc | 45 | |
46 | fPtPara = 0; | |
47 | fYPara = 0; | |
b7601ac4 | 48 | fParam = param; |
49 | fAnalog = analog; | |
fe4da5cc | 50 | fChildSelect.Set(5); |
51 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
52 | ForceDecay(); | |
53 | } | |
54 | ||
55 | //____________________________________________________________ | |
56 | AliGenParam::~AliGenParam() | |
57 | { | |
58 | delete fPtPara; | |
59 | delete fYPara; | |
60 | } | |
61 | ||
62 | //____________________________________________________________ | |
63 | void AliGenParam::Init() | |
64 | { | |
65 | SetMC(new AliPythia()); | |
66 | fPythia= (AliPythia*) fgMCEvGen; | |
67 | ||
68 | // End of the test !!! | |
69 | //Begin_Html | |
70 | /* | |
71 | <img src="gif/AliGenParam.gif"> | |
72 | */ | |
73 | //End_Html | |
74 | ||
b7601ac4 | 75 | fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0); |
76 | fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0); | |
77 | TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0); | |
78 | TF1* YPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0); | |
79 | ||
fe4da5cc | 80 | // |
81 | // dN/dy| y=0 | |
82 | Double_t y1=0; | |
83 | Double_t y2=0; | |
84 | ||
85 | fdNdy0=fYParaFunc(&y1,&y2); | |
86 | // | |
87 | // Integral over generation region | |
b7601ac4 | 88 | Float_t IntYS = YPara ->Integral(fYMin, fYMax); |
89 | Float_t IntPt0 = PtPara->Integral(0,15); | |
90 | Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax); | |
fe4da5cc | 91 | Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi(); |
92 | if (fAnalog) { | |
93 | fYWgt = IntYS/fdNdy0; | |
94 | fPtWgt = IntPtS/IntPt0; | |
95 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
96 | } else { | |
97 | fYWgt = IntYS/fdNdy0; | |
98 | fPtWgt = (fPtMax-fPtMin)/IntPt0; | |
99 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
100 | } | |
101 | // | |
102 | // particle decay related initialization | |
103 | fPythia->DefineParticles(); | |
104 | // semimuonic decays of charm and beauty | |
105 | fPythia->ForceDecay(fForceDecay); | |
106 | // | |
107 | switch (fForceDecay) | |
108 | { | |
109 | case semielectronic: | |
110 | case dielectron: | |
111 | case b_jpsi_dielectron: | |
112 | case b_psip_dielectron: | |
113 | fChildSelect[0]=11; | |
114 | break; | |
115 | case semimuonic: | |
116 | case dimuon: | |
117 | case b_jpsi_dimuon: | |
118 | case b_psip_dimuon: | |
119 | fChildSelect[0]=13; | |
120 | break; | |
b7601ac4 | 121 | case pitomu: |
122 | fChildSelect[0]=13; | |
123 | break; | |
124 | case katomu: | |
125 | fChildSelect[0]=13; | |
126 | break; | |
fe4da5cc | 127 | } |
128 | ||
129 | } | |
130 | ||
131 | //____________________________________________________________ | |
132 | void AliGenParam::Generate() | |
133 | { | |
134 | // Generate 'npart' of heavy mesons (J/Psi, upsilon or phi) in the | |
135 | // the desired theta, phi and momentum windows; Gaussian smearing | |
136 | // on the vertex is done if selected | |
137 | ||
138 | AliMC* pMC = AliMC::GetMC(); | |
139 | ||
140 | Float_t polar[3]= {0,0,0}; | |
141 | // | |
142 | Float_t origin[3], origin0[3]; | |
143 | Float_t pt, pl, ptot; | |
144 | Float_t phi, theta; | |
145 | Float_t p[3]; | |
146 | Float_t ty, xmt; | |
147 | Int_t i, nt, j; | |
148 | Float_t wgtp, wgtch; | |
149 | Double_t dummy; | |
150 | // | |
151 | // | |
152 | Float_t random[6]; | |
153 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; | |
154 | if(fVertexSmear==perEvent) { | |
155 | pMC->Rndm(random,6); | |
156 | for (j=0;j<3;j++) { | |
157 | origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
158 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
159 | } | |
160 | } | |
161 | for(i=0;i<fNpart;i++) { | |
162 | while(1) { | |
163 | // | |
164 | // particle type | |
165 | Int_t Ipart = fIpParaFunc(); | |
166 | fChildWeight=(fPythia->GetBraPart(Ipart))*fParentWeight; | |
167 | Float_t am=fPythia->GetPMAS(fPythia->LuComp(Ipart),1); | |
168 | pMC->Rndm(random,2); | |
169 | // | |
170 | // phi | |
171 | phi=fPhiMin+random[0]*(fPhiMax-fPhiMin); | |
172 | // | |
173 | // y | |
174 | ty=Float_t(TMath::TanH(fYPara->GetRandom())); | |
175 | // | |
176 | // pT | |
177 | if (fAnalog) { | |
178 | pt=fPtPara->GetRandom(); | |
179 | wgtp=fParentWeight; | |
180 | wgtch=fChildWeight; | |
181 | } else { | |
182 | pt=fPtMin+random[1]*(fPtMax-fPtMin); | |
183 | Double_t ptd=pt; | |
184 | wgtp=fParentWeight*fPtParaFunc(& ptd, &dummy); | |
185 | wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy); | |
186 | } | |
187 | xmt=sqrt(pt*pt+am*am); | |
188 | pl=xmt*ty/sqrt(1.-ty*ty); | |
189 | theta=TMath::ATan2(pt,pl); | |
190 | if(theta<fThetaMin || theta>fThetaMax) continue; | |
191 | ptot=TMath::Sqrt(pt*pt+pl*pl); | |
192 | if(ptot<fPMin || ptot>fPMax) continue; | |
193 | p[0]=pt*TMath::Cos(phi); | |
194 | p[1]=pt*TMath::Sin(phi); | |
195 | p[2]=pl; | |
196 | if(fVertexSmear==perTrack) { | |
197 | pMC->Rndm(random,6); | |
198 | for (j=0;j<3;j++) { | |
199 | origin0[j]= | |
200 | fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
201 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
202 | } | |
203 | } | |
204 | ||
205 | Int_t kg=fPythia->GetGeantCode(Ipart); | |
206 | // | |
207 | // parent | |
208 | ||
209 | gAlice-> | |
210 | SetTrack(0,-1,kg,p,origin,polar,0,"Primary",nt,wgtp); | |
211 | Int_t iparent=nt; | |
212 | // | |
213 | // use lujet to decay particle | |
214 | ||
215 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
216 | fPythia->DecayParticle(Ipart,energy,theta,phi); | |
b7601ac4 | 217 | // fPythia->LuList(1); |
218 | ||
fe4da5cc | 219 | // |
220 | // select muons | |
221 | TObjArray* particles = fPythia->GetPrimaries() ; | |
222 | Int_t np = particles->GetEntriesFast(); | |
223 | for (Int_t i = 0; i<np; i++) { | |
224 | TMCParticle * iparticle = (TMCParticle *) particles->At(i); | |
225 | Int_t kf = iparticle->GetKF(); | |
226 | // | |
227 | // children | |
228 | if (ChildSelected(TMath::Abs(kf))) | |
229 | { | |
230 | p[0]=iparticle->GetPx(); | |
231 | p[1]=iparticle->GetPy(); | |
232 | p[2]=iparticle->GetPz(); | |
233 | origin[0]=origin0[0]+iparticle->GetVx()/10; | |
234 | origin[1]=origin0[1]+iparticle->GetVy()/10; | |
235 | origin[2]=origin0[2]+iparticle->GetVz()/10; | |
b7601ac4 | 236 | gAlice->SetTrack(fTrackIt,iparent,fPythia->GetGeantCode(kf), |
fe4da5cc | 237 | p,origin,polar, |
238 | 0,"Decay",nt,wgtch); | |
239 | gAlice->KeepTrack(nt); | |
240 | } // select muon | |
241 | } // decay particle loop | |
242 | break; | |
243 | } // kinematic selection | |
244 | } // event loop | |
245 | } | |
246 | ||
247 | Bool_t AliGenParam::ChildSelected(Int_t ip) | |
248 | { | |
249 | for (Int_t i=0; i<5; i++) | |
250 | { | |
251 | if (fChildSelect[i]==ip) return kTRUE; | |
252 | } | |
253 | return kFALSE; | |
254 | } | |
255 | ||
256 | Bool_t AliGenParam::KinematicSelection(TMCParticle *particle) | |
257 | { | |
258 | Float_t px=particle->GetPx(); | |
259 | Float_t py=particle->GetPy(); | |
260 | Float_t pz=particle->GetPz(); | |
261 | // | |
262 | // momentum cut | |
263 | Float_t p=TMath::Sqrt(px*px+py*py+pz*pz); | |
264 | if (p > fPMax || p < fPMin) | |
265 | { | |
266 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
267 | return kFALSE; | |
268 | } | |
269 | Float_t pt=TMath::Sqrt(px*px+py*py); | |
270 | ||
271 | // | |
272 | // theta cut | |
273 | Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p))); | |
274 | if (theta > fThetaMax || theta < fThetaMin) | |
275 | { | |
276 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
277 | return kFALSE; | |
278 | } | |
279 | ||
280 | return kTRUE; | |
281 | } | |
282 | ||
283 | ||
284 | ||
285 |