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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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //___________________________________________________ | |
19 | //////////////////////////////////////////////////////////////////////////////// | |
20 | // | |
21 | // class AliHBTPositionRandomizer | |
22 | // | |
23 | // These class randomizes particle vertex positions | |
24 | // Piotr.Skowronski@cern.ch | |
25 | // | |
26 | //////////////////////////////////////////////////////////////////////////////// | |
27 | ||
28 | #include <TMath.h> | |
29 | #include <TRandom.h> | |
30 | ||
31 | #include "AliAOD.h" | |
32 | #include "AliHBTPositionRandomizer.h" | |
33 | #include "AliLog.h" | |
34 | #include "AliVAODParticle.h" | |
35 | ||
36 | ||
37 | ClassImp(AliHBTPositionRandomizer) | |
38 | ||
39 | const Int_t AliHBTPositionRandomizer::fgkNumberOfPids = 10; | |
40 | ||
41 | /*********************************************************************/ | |
42 | ||
43 | AliHBTPositionRandomizer::AliHBTPositionRandomizer(): | |
44 | fReader(0x0), | |
45 | fDefaultRandomizer(0x0), | |
46 | fRandomizers(0x0), | |
47 | fNPid(0), | |
48 | fPids(0x0), | |
49 | fAddToExistingPos(kFALSE), | |
50 | fOnlyParticlesFromVertex(kFALSE), | |
51 | fRandomizeTracks(kFALSE), | |
52 | fVX(0.0), | |
53 | fVY(0.0), | |
54 | fVZ(0.0) | |
55 | { | |
56 | //constructor | |
57 | } | |
58 | /*********************************************************************/ | |
59 | ||
60 | AliHBTPositionRandomizer::AliHBTPositionRandomizer(AliReader* reader): | |
61 | fReader(reader), | |
62 | fRandomizers(new TObjArray(fgkNumberOfPids)), | |
63 | fNPid(1), | |
64 | fPids(new Int_t[fgkNumberOfPids]), | |
65 | fAddToExistingPos(kFALSE), | |
66 | fOnlyParticlesFromVertex(kFALSE), | |
67 | fRandomizeTracks(kFALSE), | |
68 | fVX(0.0), | |
69 | fVY(0.0), | |
70 | fVZ(0.0) | |
71 | { | |
72 | //constructor | |
73 | fRandomizers->AddAt(new AliHBTRndmGaussBall(8.0,0.0,0.0),0); | |
74 | } | |
75 | /*********************************************************************/ | |
76 | ||
77 | AliHBTPositionRandomizer::AliHBTPositionRandomizer(const AliHBTPositionRandomizer& in): | |
78 | AliReader(in), | |
79 | fReader(), | |
80 | fRandomizers(0x0), | |
81 | fNPid(0), | |
82 | fPids(0x0), | |
83 | fAddToExistingPos(kFALSE), | |
84 | fOnlyParticlesFromVertex(kFALSE), | |
85 | fRandomizeTracks(kFALSE), | |
86 | fVX(0.0), | |
87 | fVY(0.0), | |
88 | fVZ(0.0) | |
89 | { | |
90 | //cpy constructor | |
91 | in.Copy(*this); | |
92 | } | |
93 | /*********************************************************************/ | |
94 | AliHBTPositionRandomizer::~AliHBTPositionRandomizer() | |
95 | { | |
96 | //dtor | |
97 | delete fReader; | |
98 | delete fRandomizers; | |
99 | delete [] fPids; | |
100 | } | |
101 | /*********************************************************************/ | |
102 | AliHBTPositionRandomizer& AliHBTPositionRandomizer::operator=(const AliHBTPositionRandomizer& in) | |
103 | { | |
104 | //assigment operator | |
105 | in.Copy(*this); | |
106 | return *this; | |
107 | } | |
108 | /*********************************************************************/ | |
109 | ||
110 | AliAOD* AliHBTPositionRandomizer::GetEventSim() const | |
111 | { | |
112 | // gets from fReader and randomizes current particle event | |
113 | if (fReader == 0x0) | |
114 | { | |
115 | Error("GetEventSim","Reader is null"); | |
116 | return 0x0; | |
117 | } | |
118 | AliAOD *e = fReader->GetEventSim(); | |
119 | if (e) | |
120 | if (e->IsRandomized() == kFALSE) | |
121 | Randomize(e); | |
122 | return e; | |
123 | } | |
124 | /*********************************************************************/ | |
125 | ||
126 | AliAOD* AliHBTPositionRandomizer::GetEventRec() const | |
127 | { | |
128 | // gets from fReader and randomizes current track event | |
129 | if (fReader == 0x0) | |
130 | { | |
131 | Error("GetEventRec","Reader is null"); | |
132 | return 0x0; | |
133 | } | |
134 | AliAOD *e = fReader->GetEventRec(); | |
135 | if (fRandomizeTracks && e) if (e->IsRandomized() == kFALSE) Randomize(e); | |
136 | return e; | |
137 | } | |
138 | /*********************************************************************/ | |
139 | ||
140 | AliAOD* AliHBTPositionRandomizer::GetEventSim(Int_t n) | |
141 | { | |
142 | //returns event n | |
143 | if (fReader == 0x0) return 0x0; | |
144 | AliAOD *e = fReader->GetEventSim(n); | |
145 | if (e->IsRandomized() == kFALSE) Randomize(e); | |
146 | return e; | |
147 | } | |
148 | ||
149 | /*********************************************************************/ | |
150 | void AliHBTPositionRandomizer::Randomize(AliAOD* event) const | |
151 | { | |
152 | // randomizes postions of all particles in the event | |
153 | static const Double_t kfmtocm = 1.e-13; | |
154 | AliDebug(5," "); | |
155 | if (event == 0x0) return; | |
156 | ||
157 | for (Int_t i = 0; i < event->GetNumberOfParticles(); i++) | |
158 | { | |
159 | AliVAODParticle* p = event->GetParticle(i); | |
160 | Double_t x,y,z,t=0.0; | |
161 | AliHBTRndm* r = GetRandomizer(p->GetPdgCode()); | |
162 | r->Randomize(x,y,z,t,p); | |
163 | ||
164 | Double_t nx = x*kfmtocm; | |
165 | Double_t ny = y*kfmtocm; | |
166 | Double_t nz = z*kfmtocm; | |
167 | Double_t nt = t*kfmtocm; | |
168 | ||
169 | if (fAddToExistingPos) | |
170 | { | |
171 | nx += p->Vx(); | |
172 | ny += p->Vy(); | |
173 | nz += p->Vz(); | |
174 | nt += p->T(); | |
175 | } | |
176 | p->SetProductionVertex(nx,ny,nz,nt); | |
177 | } | |
178 | event->SetRandomized(); | |
179 | } | |
180 | /*********************************************************************/ | |
181 | ||
182 | AliHBTRndm* AliHBTPositionRandomizer::GetRandomizer(Int_t pdg) const | |
183 | { | |
184 | //returns randomizer for a given pdg | |
185 | Int_t idx = GetRandomizerIndex(pdg);//in most of cases | |
186 | if (idx < 0) idx = 0;//if not found return a default one | |
187 | return (AliHBTRndm*)fRandomizers->At(idx); | |
188 | } | |
189 | /*********************************************************************/ | |
190 | Int_t AliHBTPositionRandomizer::GetRandomizerIndex(Int_t pdg) const | |
191 | { | |
192 | //returns randomizer index for a given pdg | |
193 | ||
194 | if (pdg == 0) return 0; | |
195 | ||
196 | for (Int_t i=1; i < fNPid; i++) | |
197 | { | |
198 | if (fPids[i] == pdg) | |
199 | return i; | |
200 | } | |
201 | ||
202 | return -1; | |
203 | } | |
204 | /*********************************************************************/ | |
205 | ||
206 | void AliHBTPositionRandomizer::SetRandomizer(Int_t pid, AliHBTRndm* rndm) | |
207 | { | |
208 | //sets the randomizer for a given particle type | |
209 | if (rndm == 0x0) | |
210 | { | |
211 | Error("SetRandomizer","Randomizer is null"); | |
212 | return; | |
213 | } | |
214 | ||
215 | Int_t idx = GetRandomizerIndex(pid); | |
216 | if (idx >= 0) | |
217 | { | |
218 | delete fRandomizers->At(idx); | |
219 | fRandomizers->AddAt(rndm,idx); | |
220 | } | |
221 | ||
222 | if (fNPid == fgkNumberOfPids) | |
223 | { | |
224 | Error("SetRandomizer","There is no more space in the array"); | |
225 | return; | |
226 | } | |
227 | ||
228 | fPids[fNPid] = pid; | |
229 | fRandomizers->AddAt(rndm,fNPid); | |
230 | fNPid++; | |
231 | } | |
232 | /*********************************************************************/ | |
233 | ||
234 | void AliHBTPositionRandomizer::SetGaussianBall(Int_t pid, Double_t r, Double_t meantime, Double_t sigmatime) | |
235 | { | |
236 | //Sets Gaussian Ball Model | |
237 | SetGaussianBall(pid,r,r,r,meantime,sigmatime); | |
238 | } | |
239 | /*********************************************************************/ | |
240 | ||
241 | void AliHBTPositionRandomizer::SetGaussianBall(Int_t pid, Double_t rx, Double_t ry, Double_t rz, Double_t meantime, Double_t sigmatime) | |
242 | { | |
243 | //Sets Gaussian Ball Model | |
244 | AliHBTRndm* rndm = new AliHBTRndmGaussBall(rx,ry,rz,meantime,sigmatime); | |
245 | SetRandomizer(pid,rndm); | |
246 | } | |
247 | /*********************************************************************/ | |
248 | ||
249 | void AliHBTPositionRandomizer::SetCyllinderSurface(Int_t pid, Double_t r, Double_t l) | |
250 | { | |
251 | //Sets Cylinder Surface Model | |
252 | AliHBTRndm* rndm = new AliHBTRndmCyllSurf(r,l); | |
253 | SetRandomizer(pid,rndm); | |
254 | } | |
255 | /*********************************************************************/ | |
256 | ||
257 | void AliHBTPositionRandomizer::SetEventVertex(Double_t x, Double_t y,Double_t z) | |
258 | { | |
259 | //sets event vertex position | |
260 | fVX = x; | |
261 | fVY = y; | |
262 | fVZ = z; | |
263 | } | |
264 | ||
265 | ||
266 | void AliHBTPositionRandomizer::SetEllipse(Int_t pid, Double_t rx, Double_t ryz) | |
267 | { | |
268 | //sets the ellipse randomization for the given pid | |
269 | AliHBTRndm* rndm = new AliHBTRndmEllipse(rx,ryz); | |
270 | SetRandomizer(pid,rndm); | |
271 | } | |
272 | ||
273 | /*********************************************************************/ | |
274 | //_____________________________________________________________________ | |
275 | /////////////////////////////////////////////////////////////////////// | |
276 | // // | |
277 | // class AliHBTRndmGaussBall // | |
278 | // // | |
279 | /////////////////////////////////////////////////////////////////////// | |
280 | ||
281 | AliHBTRndmGaussBall::AliHBTRndmGaussBall(): | |
282 | fRx(0.0), | |
283 | fRy(0.0), | |
284 | fRz(0.0), | |
285 | fTmean(0.0), | |
286 | fTsigma(0.0) | |
287 | { | |
288 | //constructor | |
289 | } | |
290 | /*********************************************************************/ | |
291 | ||
292 | AliHBTRndmGaussBall::AliHBTRndmGaussBall(Float_t r, Double_t meantime, Double_t sigmatime): | |
293 | fRx(r), | |
294 | fRy(r), | |
295 | fRz(r), | |
296 | fTmean(meantime), | |
297 | fTsigma(sigmatime) | |
298 | { | |
299 | //constructor | |
300 | } | |
301 | /*********************************************************************/ | |
302 | ||
303 | AliHBTRndmGaussBall::AliHBTRndmGaussBall(Float_t rx, Float_t ry, Float_t rz, Double_t meantime, Double_t sigmatime): | |
304 | fRx(rx), | |
305 | fRy(ry), | |
306 | fRz(rz), | |
307 | fTmean(meantime), | |
308 | fTsigma(sigmatime) | |
309 | { | |
310 | //constructor | |
311 | } | |
312 | /*********************************************************************/ | |
313 | ||
314 | ||
315 | AliHBTRndmEllipse::AliHBTRndmEllipse(Float_t rmin, Float_t rmax): | |
316 | fRmin(rmin), | |
317 | fRmax(rmax) | |
318 | { | |
319 | //constructor | |
320 | } | |
321 | ||
322 | /*********************************************************************/ | |
323 | ||
324 | void AliHBTRndmGaussBall::Randomize(Double_t& x,Double_t& y,Double_t&z,Double_t&t, AliVAODParticle*/*particle*/) const | |
325 | { | |
326 | //randomizez gauss for each coordinate separately | |
327 | x = gRandom->Gaus(0.0,fRx); | |
328 | y = gRandom->Gaus(0.0,fRy); | |
329 | z = gRandom->Gaus(0.0,fRz); | |
330 | ||
331 | if (fTsigma == 0.0) | |
332 | { | |
333 | t = fTmean; | |
334 | return; | |
335 | } | |
336 | ||
337 | t = gRandom->Gaus(fTmean,fTsigma); | |
338 | ||
339 | } | |
340 | /*********************************************************************/ | |
341 | //_____________________________________________________________________ | |
342 | /////////////////////////////////////////////////////////////////////// | |
343 | // // | |
344 | // class AliHBTRndmGaussBall // | |
345 | // // | |
346 | /////////////////////////////////////////////////////////////////////// | |
347 | ||
348 | void AliHBTRndmCyllSurf::Randomize(Double_t& x,Double_t& y,Double_t&z,Double_t&/*t*/, AliVAODParticle* particle) const | |
349 | { | |
350 | //Randomizes x,y,z | |
351 | Double_t r = fR + gRandom->Gaus(0.0, 1.0); | |
352 | Double_t sf = r/particle->Pt();//scaling factor for position transformation -> | |
353 | //we move direction of string momentum but legth defined by r | |
354 | x = sf*particle->Px(); | |
355 | y = sf*particle->Py(); | |
356 | z = gRandom->Uniform(-fL,fL); | |
357 | } | |
358 | ||
359 | /*********************************************************************/ | |
360 | /*********************************************************************/ | |
361 | ||
362 | void AliHBTRndmEllipse::Randomize(Double_t& x, Double_t& y, Double_t& z,Double_t&/*t*/, AliVAODParticle*p) const | |
363 | { | |
364 | // p=0; //workaround - fix this damn little thingy | |
365 | double R; | |
366 | double phi=p->Phi(); | |
367 | ||
368 | R=fRmin+(fRmax-fRmin)*TMath::Sin(phi); | |
369 | x=R*TMath::Sin(phi); | |
370 | y=R*TMath::Cos(phi); | |
371 | z=z; | |
372 | } |