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ccc5bf38 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2007, 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 | // Generator for particles according generic functions | |
17 | // | |
18 | // TF1 * fFMomentum; // momentum distribution function inGeV | |
19 | // TF1 * fFPhi; // phi distribution function in rad | |
20 | // TF1 * fFTheta; // theta distribution function in rad | |
21 | // TF3 * fFPosition; // position distribution function in cm | |
22 | // TF1 * fFPdg; // pdg distribution function | |
23 | // We assume that the moment, postion and PDG code of particles are independent | |
24 | // Only tracks/particle crossing the reference radius at given z range | |
25 | // | |
26 | // Origin: marian.ivanov@cern.ch | |
27 | ||
28 | ||
29 | /* | |
30 | Example generic function for cosmic generation: | |
31 | ||
32 | // | |
33 | AliGenFunction *generCosmic = new AliGenFunction; | |
34 | generCosmic->SetNumberParticles(100); | |
35 | TF1 *fmom = new TF1("fmom","TMath::Exp(-x/8)",0,30); | |
36 | // | |
37 | TF1 *fphi = new TF1("fphi","TMath::Gaus(x,-TMath::Pi()/2,0.3)",-3.14,3.14); | |
38 | TF1 *ftheta = new TF1("ftheta","TMath::Gaus(x,TMath::Pi()/2,0.3)",-3.14,3.14); | |
39 | TF3 *fpos = new TF3("fpos","1+(x+y+z)*0",-2000,2000,700,701,-2000,2000); | |
40 | TF1 * fpdg= new TF1("fpdg","1*(abs(x-13)<0.1)+1*(abs(x+13)<0.1)",-300,300); | |
41 | fpdg->SetNpx(10000); // neccessary - number of bins for generation | |
42 | generCosmic->SetVertexSmear(kPerEvent); | |
43 | generCosmic->SetFunctions(fmom,fphi,ftheta,fpos,fpdg); | |
44 | generCosmic->SetCylinder(375,-375,375); | |
45 | generCosmic->SetBkG(0.2); | |
46 | gener->AddGenerator(generCosmic,"generCosmic",1); | |
47 | ||
48 | ||
49 | ||
50 | */ | |
51 | ||
52 | ||
53 | ||
54 | ||
55 | #include <TParticle.h> | |
56 | #include <TF1.h> | |
57 | #include <TF3.h> | |
48c27d61 | 58 | #include <TDatabasePDG.h> |
ccc5bf38 | 59 | |
60 | #include "AliRun.h" | |
61 | #include "AliESDtrack.h" | |
62 | #include "AliESDVertex.h" | |
63 | #include "AliGenFunction.h" | |
fee5f683 | 64 | #include "AliGenEventHeader.h" |
ccc5bf38 | 65 | |
66 | ClassImp(AliGenFunction) | |
67 | ||
68 | //----------------------------------------------------------------------------- | |
69 | AliGenFunction::AliGenFunction(): | |
70 | AliGenerator(), | |
71 | fBkG(0.), | |
72 | fFMomentum(0), // momentum distribution function | |
73 | fFPhi(0), // phi distribution function | |
74 | fFTheta(0), // theta distribution function | |
75 | fFPosition(0), // position distribution function | |
76 | fFPdg(0), // pdg distribution function | |
77 | fRefRadius(0), // reference radius to be crossed | |
78 | fZmin(0), // minimal z at reference radius | |
79 | fZmax(0), // z at reference radius | |
80 | fMaxTrial(10000) // maximal number of attempts | |
81 | { | |
82 | // | |
83 | // Default constructor | |
84 | // | |
85 | SetNumberParticles(1); | |
86 | } | |
21eff5bc | 87 | |
88 | AliGenFunction::AliGenFunction(const AliGenFunction& func): | |
89 | AliGenerator(), | |
90 | fBkG(func.fBkG), | |
91 | fFMomentum(func.fFMomentum), // momentum distribution function | |
92 | fFPhi(func.fFPhi), // phi distribution function | |
93 | fFTheta(func.fFTheta), // theta distribution function | |
94 | fFPosition(func.fFPosition), // position distribution function | |
95 | fFPdg(func.fFPdg), // pdg distribution function | |
96 | fRefRadius(func.fRefRadius), // reference radius to be crossed | |
97 | fZmin(func.fZmin), // minimal z at reference radius | |
98 | fZmax(func.fZmax), // z at reference radius | |
99 | fMaxTrial(10000) // maximal number of attempts | |
100 | { | |
101 | // Copy constructor | |
102 | SetNumberParticles(1); | |
103 | } | |
104 | ||
105 | AliGenFunction & AliGenFunction::operator=(const AliGenFunction& func) | |
106 | { | |
107 | // Assigment operator | |
108 | if(&func == this) return *this; | |
109 | fBkG = func.fBkG; | |
110 | fFMomentum = func.fFMomentum; | |
111 | fFPhi = func.fFPhi; | |
112 | fFTheta = func.fFTheta; | |
113 | fFPosition = func.fFPosition; | |
114 | fFPdg = func.fFPdg; | |
115 | fRefRadius = func.fRefRadius; | |
116 | fZmin = func.fZmin; | |
117 | fZmax = func.fZmax; | |
118 | fMaxTrial = func.fMaxTrial; | |
119 | return *this; | |
120 | } | |
121 | ||
122 | ||
ccc5bf38 | 123 | //----------------------------------------------------------------------------- |
124 | void AliGenFunction::Generate() | |
125 | { | |
126 | // | |
127 | // Generate one muon | |
128 | // | |
129 | Int_t naccepted =0; | |
130 | ||
131 | for (Int_t ipart=0; ipart<fMaxTrial && naccepted<fNpart; ipart++){ | |
132 | // | |
133 | // | |
134 | // | |
135 | Float_t mom[3]; | |
136 | Float_t posf[3]; | |
137 | Double_t pos[3]; | |
138 | Int_t pdg; | |
21eff5bc | 139 | Double_t ptot, pt, phi, theta; |
ccc5bf38 | 140 | // |
141 | ptot = fFMomentum->GetRandom(); | |
142 | phi = fFPhi->GetRandom(); | |
143 | theta = fFTheta->GetRandom(); | |
144 | pt = ptot*TMath::Sin(theta); | |
145 | mom[0] = pt*TMath::Cos(phi); | |
146 | mom[1] = pt*TMath::Sin(phi); | |
147 | mom[2] = ptot*TMath::Cos(theta); | |
148 | ||
149 | // | |
150 | fFPosition->GetRandom3(pos[0],pos[1],pos[2]); | |
151 | posf[0]=pos[0]; | |
152 | posf[1]=pos[1]; | |
153 | posf[2]=pos[2]; | |
154 | pdg = TMath::Nint(fFPdg->GetRandom()); | |
155 | if (!IntersectCylinder(fRefRadius,fZmin, fZmax, pdg, posf, mom)) continue; | |
156 | // | |
157 | // | |
158 | Float_t polarization[3]= {0,0,0}; | |
159 | Int_t nt; | |
160 | PushTrack(fTrackIt,-1,pdg,mom, posf, polarization,0,kPPrimary,nt); | |
161 | naccepted++; | |
162 | } | |
163 | ||
fee5f683 | 164 | AliGenEventHeader* header = new AliGenEventHeader("THn"); |
165 | gAlice->SetGenEventHeader(header); | |
ccc5bf38 | 166 | return; |
167 | } | |
168 | //----------------------------------------------------------------------------- | |
169 | void AliGenFunction::Init() | |
170 | { | |
171 | // | |
172 | // Initialisation, check consistency of selected ranges | |
173 | // | |
174 | printf("************ AliGenFunction ****************\n"); | |
175 | printf("************************************************\n"); | |
176 | if (!fFMomentum){ | |
177 | AliFatal("Momentum distribution function not specified"); | |
178 | } | |
179 | if (!fFPosition){ | |
180 | AliFatal("Position distribution function not specified"); | |
181 | } | |
182 | if (!fFPdg){ | |
183 | AliFatal("PDG distribution function not specified"); | |
184 | } | |
185 | if (fZmin==fZmax){ | |
186 | AliFatal("Z range not specified"); | |
187 | } | |
188 | ||
189 | return; | |
190 | } | |
191 | ||
192 | void AliGenFunction::SetFunctions(TF1 * momentum, TF1 *fphi, TF1 *ftheta,TF3 * position, TF1* pdg){ | |
193 | // | |
194 | // | |
195 | // | |
196 | fFMomentum = momentum; | |
197 | fFPhi = fphi; | |
198 | fFTheta = ftheta; | |
199 | fFPosition = position; | |
200 | fFPdg = pdg; | |
201 | } | |
202 | ||
203 | void AliGenFunction::SetCylinder(Double_t refR, Double_t zmin, Double_t zmax){ | |
204 | // | |
205 | // | |
206 | // | |
207 | fRefRadius = refR; // reference radius to be crossed | |
208 | fZmin = zmin; // minimal z at reference radius | |
209 | fZmax = zmax; // maximal z at reference radius | |
210 | ||
211 | } | |
212 | ||
213 | ||
214 | //----------------------------------------------------------------------------- | |
215 | Bool_t AliGenFunction::IntersectCylinder(Float_t r,Float_t zmin, Float_t zmax,Int_t pdg, | |
216 | Float_t o[3],Float_t p[3]) const | |
217 | { | |
218 | // | |
219 | // Intersection between muon and cylinder [-z,+z] with radius r | |
220 | // | |
221 | Double_t mass=0; | |
222 | if (TDatabasePDG::Instance()->GetParticle(pdg)){ | |
223 | mass = TDatabasePDG::Instance()->GetParticle(13)->Mass(); | |
224 | } | |
225 | ||
226 | Float_t en = TMath::Sqrt(mass*mass+p[0]*p[0]+p[1]*p[1]+p[2]*p[2]); | |
227 | TParticle part(pdg,0,0,0,0,0,p[0],p[1],p[2],en,o[0],o[1],o[2],0); | |
228 | AliESDtrack track(&part); | |
229 | Double_t pos[3]={0.,0.,0.},sigma[3]={0.,0.,0.}; | |
230 | AliESDVertex origin(pos,sigma); | |
231 | ||
232 | track.RelateToVertex(&origin,fBkG,10000.); | |
233 | ||
234 | Float_t d0z0[2],covd0z0[3]; | |
235 | track.GetImpactParameters(d0z0,covd0z0); | |
236 | ||
237 | // check rphi | |
238 | if(TMath::Abs(d0z0[0])>r) return kFALSE; | |
239 | // check z | |
240 | if(d0z0[1]>zmax) return kFALSE; | |
241 | if(d0z0[1]<zmin) return kFALSE; | |
242 | // | |
243 | return kTRUE; | |
244 | } |