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fe4da5cc | 1 | #include "AliGenParam.h" |
2 | #include "AliGenMUONlib.h" | |
3 | #include "AliRun.h" | |
fe4da5cc | 4 | #include "AliPythia.h" |
5 | #include <TDirectory.h> | |
6 | #include <TFile.h> | |
7 | #include <TTree.h> | |
8 | #include <stdlib.h> | |
1578254f | 9 | #include <TParticle.h> |
fe4da5cc | 10 | |
11 | ClassImp(AliGenParam) | |
12 | ||
13 | //------------------------------------------------------------ | |
14 | ||
15 | //Begin_Html | |
16 | /* | |
1439f98e | 17 | <img src="picts/AliGenParam.gif"> |
fe4da5cc | 18 | */ |
19 | //End_Html | |
20 | ||
21 | //____________________________________________________________ | |
22 | //____________________________________________________________ | |
23 | AliGenParam::AliGenParam() | |
24 | :AliGenerator() | |
25 | { | |
26 | fPtPara = 0; | |
27 | fYPara = 0; | |
b7601ac4 | 28 | fParam = jpsi_p; |
29 | fAnalog = analog; | |
fe4da5cc | 30 | } |
31 | ||
32 | //____________________________________________________________ | |
b7601ac4 | 33 | AliGenParam::AliGenParam(Int_t npart, Param_t param) |
fe4da5cc | 34 | // Double_t (*PtPara)(Double_t*, Double_t*), |
35 | // Double_t (*YPara) (Double_t* ,Double_t*)) | |
36 | :AliGenerator(npart) | |
37 | { | |
38 | // | |
39 | // fName="HMESONpara"; | |
40 | // fTitle="Heavy Mesons Parametrisation"; | |
b7601ac4 | 41 | fPtParaFunc = AliGenMUONlib::GetPt(param); |
42 | fYParaFunc = AliGenMUONlib::GetY(param); | |
43 | fIpParaFunc = AliGenMUONlib::GetIp(param); | |
fe4da5cc | 44 | |
45 | fPtPara = 0; | |
46 | fYPara = 0; | |
b7601ac4 | 47 | fParam = param; |
48 | fAnalog = analog; | |
fe4da5cc | 49 | fChildSelect.Set(5); |
50 | for (Int_t i=0; i<5; i++) fChildSelect[i]=0; | |
51 | ForceDecay(); | |
52 | } | |
53 | ||
54 | //____________________________________________________________ | |
55 | AliGenParam::~AliGenParam() | |
56 | { | |
57 | delete fPtPara; | |
58 | delete fYPara; | |
59 | } | |
60 | ||
61 | //____________________________________________________________ | |
62 | void AliGenParam::Init() | |
63 | { | |
64 | SetMC(new AliPythia()); | |
65 | fPythia= (AliPythia*) fgMCEvGen; | |
66 | ||
67 | // End of the test !!! | |
68 | //Begin_Html | |
69 | /* | |
1439f98e | 70 | <img src="picts/AliGenParam.gif"> |
fe4da5cc | 71 | */ |
72 | //End_Html | |
73 | ||
b7601ac4 | 74 | fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0); |
75 | fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0); | |
76 | TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0); | |
77 | TF1* YPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0); | |
78 | ||
fe4da5cc | 79 | // |
80 | // dN/dy| y=0 | |
81 | Double_t y1=0; | |
82 | Double_t y2=0; | |
83 | ||
84 | fdNdy0=fYParaFunc(&y1,&y2); | |
85 | // | |
86 | // Integral over generation region | |
b7601ac4 | 87 | Float_t IntYS = YPara ->Integral(fYMin, fYMax); |
88 | Float_t IntPt0 = PtPara->Integral(0,15); | |
89 | Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax); | |
fe4da5cc | 90 | Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi(); |
91 | if (fAnalog) { | |
92 | fYWgt = IntYS/fdNdy0; | |
93 | fPtWgt = IntPtS/IntPt0; | |
94 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
95 | } else { | |
96 | fYWgt = IntYS/fdNdy0; | |
97 | fPtWgt = (fPtMax-fPtMin)/IntPt0; | |
98 | fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart; | |
99 | } | |
100 | // | |
101 | // particle decay related initialization | |
102 | fPythia->DefineParticles(); | |
103 | // semimuonic decays of charm and beauty | |
104 | fPythia->ForceDecay(fForceDecay); | |
105 | // | |
106 | switch (fForceDecay) | |
107 | { | |
108 | case semielectronic: | |
109 | case dielectron: | |
110 | case b_jpsi_dielectron: | |
111 | case b_psip_dielectron: | |
112 | fChildSelect[0]=11; | |
113 | break; | |
114 | case semimuonic: | |
115 | case dimuon: | |
116 | case b_jpsi_dimuon: | |
117 | case b_psip_dimuon: | |
118 | fChildSelect[0]=13; | |
119 | break; | |
b7601ac4 | 120 | case pitomu: |
121 | fChildSelect[0]=13; | |
122 | break; | |
123 | case katomu: | |
124 | fChildSelect[0]=13; | |
125 | break; | |
fe4da5cc | 126 | } |
127 | ||
128 | } | |
129 | ||
130 | //____________________________________________________________ | |
131 | void AliGenParam::Generate() | |
132 | { | |
133 | // Generate 'npart' of heavy mesons (J/Psi, upsilon or phi) in the | |
134 | // the desired theta, phi and momentum windows; Gaussian smearing | |
135 | // on the vertex is done if selected | |
136 | ||
fe4da5cc | 137 | |
138 | Float_t polar[3]= {0,0,0}; | |
139 | // | |
140 | Float_t origin[3], origin0[3]; | |
141 | Float_t pt, pl, ptot; | |
142 | Float_t phi, theta; | |
143 | Float_t p[3]; | |
144 | Float_t ty, xmt; | |
145 | Int_t i, nt, j; | |
146 | Float_t wgtp, wgtch; | |
147 | Double_t dummy; | |
09fd3ea2 | 148 | static TClonesArray *particles; |
fe4da5cc | 149 | // |
09fd3ea2 | 150 | if(!particles) particles=new TClonesArray("TParticle",1000); |
fe4da5cc | 151 | // |
152 | Float_t random[6]; | |
153 | for (j=0;j<3;j++) origin0[j]=fOrigin[j]; | |
154 | if(fVertexSmear==perEvent) { | |
cfce8870 | 155 | gMC->Rndm(random,6); |
fe4da5cc | 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); | |
cfce8870 | 168 | gMC->Rndm(random,2); |
fe4da5cc | 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) { | |
cfce8870 | 197 | gMC->Rndm(random,6); |
fe4da5cc | 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 | ||
fe4da5cc | 205 | // |
206 | // parent | |
207 | ||
208 | gAlice-> | |
1578254f | 209 | SetTrack(0,-1,Ipart,p,origin,polar,0,"Primary",nt,wgtp); |
fe4da5cc | 210 | Int_t iparent=nt; |
211 | // | |
212 | // use lujet to decay particle | |
213 | ||
214 | Float_t energy=TMath::Sqrt(ptot*ptot+am*am); | |
215 | fPythia->DecayParticle(Ipart,energy,theta,phi); | |
b7601ac4 | 216 | // fPythia->LuList(1); |
217 | ||
fe4da5cc | 218 | // |
219 | // select muons | |
09fd3ea2 | 220 | fPythia->ImportParticles(particles) ; |
fe4da5cc | 221 | Int_t np = particles->GetEntriesFast(); |
222 | for (Int_t i = 0; i<np; i++) { | |
1578254f | 223 | TParticle * iparticle = (TParticle *) particles->At(i); |
224 | Int_t kf = iparticle->GetPdgCode(); | |
fe4da5cc | 225 | // |
226 | // children | |
227 | if (ChildSelected(TMath::Abs(kf))) | |
228 | { | |
1578254f | 229 | p[0]=iparticle->Px(); |
230 | p[1]=iparticle->Py(); | |
231 | p[2]=iparticle->Pz(); | |
232 | origin[0]=origin0[0]+iparticle->Vx()/10; | |
233 | origin[1]=origin0[1]+iparticle->Vy()/10; | |
234 | origin[2]=origin0[2]+iparticle->Vz()/10; | |
235 | gAlice->SetTrack(fTrackIt,iparent,kf, | |
fe4da5cc | 236 | p,origin,polar, |
237 | 0,"Decay",nt,wgtch); | |
238 | gAlice->KeepTrack(nt); | |
239 | } // select muon | |
240 | } // decay particle loop | |
241 | break; | |
242 | } // kinematic selection | |
243 | } // event loop | |
244 | } | |
245 | ||
246 | Bool_t AliGenParam::ChildSelected(Int_t ip) | |
247 | { | |
248 | for (Int_t i=0; i<5; i++) | |
249 | { | |
250 | if (fChildSelect[i]==ip) return kTRUE; | |
251 | } | |
252 | return kFALSE; | |
253 | } | |
254 | ||
1578254f | 255 | Bool_t AliGenParam::KinematicSelection(TParticle *particle) |
fe4da5cc | 256 | { |
1578254f | 257 | Float_t px=particle->Px(); |
258 | Float_t py=particle->Py(); | |
259 | Float_t pz=particle->Pz(); | |
fe4da5cc | 260 | // |
261 | // momentum cut | |
262 | Float_t p=TMath::Sqrt(px*px+py*py+pz*pz); | |
263 | if (p > fPMax || p < fPMin) | |
264 | { | |
265 | // printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax); | |
266 | return kFALSE; | |
267 | } | |
268 | Float_t pt=TMath::Sqrt(px*px+py*py); | |
269 | ||
270 | // | |
271 | // theta cut | |
272 | Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p))); | |
273 | if (theta > fThetaMax || theta < fThetaMin) | |
274 | { | |
275 | // printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax); | |
276 | return kFALSE; | |
277 | } | |
278 | ||
279 | return kTRUE; | |
280 | } | |
281 | ||
282 | ||
283 | ||
284 |