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3decf5cb | 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 | ||
b2a60966 | 16 | /* $Id$ */ |
17 | ||
3decf5cb | 18 | //_________________________________________________________________________ |
b2a60966 | 19 | // Implementation of the PHOS manager class for fast simulations |
20 | // Tracks particles until the reach a grossly designed PHOS module | |
21 | // Modify the particles property (momentum, energy, type) according to | |
22 | // the PHOS response function. The result is called a virtual reconstructed | |
23 | // particle. | |
24 | // | |
25 | //*-- Author: Yves Schutz (SUBATECH) | |
3decf5cb | 26 | |
27 | // --- ROOT system --- | |
3a4295ee | 28 | |
3decf5cb | 29 | #include "TBRIK.h" |
30 | #include "TNode.h" | |
31 | #include "TParticle.h" | |
3a4295ee | 32 | #include "TTree.h" |
33 | #include "TGeometry.h" | |
34 | #include "TFile.h" | |
3decf5cb | 35 | |
36 | // --- Standard library --- | |
37 | ||
3decf5cb | 38 | // --- AliRoot header files --- |
3a4295ee | 39 | #include "AliPHOSFastRecParticle.h" |
40 | #include "AliPHOSGeometry.h" | |
3decf5cb | 41 | #include "AliPHOSvFast.h" |
3a4295ee | 42 | #include "AliPHOSGetter.h" |
3decf5cb | 43 | #include "AliRun.h" |
44 | #include "AliConst.h" | |
3a4295ee | 45 | #include "AliMC.h" |
3decf5cb | 46 | |
47 | ClassImp(AliPHOSvFast) | |
48 | ||
49 | //____________________________________________________________________________ | |
3a4295ee | 50 | AliPHOSvFast::AliPHOSvFast() : AliPHOS() |
3decf5cb | 51 | { |
3a4295ee | 52 | // default ctor : initialize data member |
53 | fBigBoxX = 0. ; | |
54 | fBigBoxY = 0. ; | |
55 | fBigBoxZ = 0. ; | |
56 | fFastRecParticles = 0 ; | |
57 | fNRecParticles = 0 ; | |
58 | fRan = 0 ; | |
59 | fResPara1 = 0. ; | |
60 | fResPara2 = 0. ; | |
61 | fResPara3 = 0. ; | |
62 | fPosParaA0 = 0. ; | |
63 | fPosParaA1 = 0. ; | |
64 | fPosParaB0 = 0. ; | |
65 | fPosParaB1 = 0. ; | |
66 | fPosParaB2 = 0. ; | |
b2a60966 | 67 | |
3decf5cb | 68 | } |
69 | ||
70 | //____________________________________________________________________________ | |
71 | AliPHOSvFast::AliPHOSvFast(const char *name, const char *title): | |
72 | AliPHOS(name,title) | |
73 | { | |
b2a60966 | 74 | // ctor |
75 | ||
3decf5cb | 76 | |
7a9d98f9 | 77 | // create the Getter |
78 | AliPHOSGetter::GetInstance(gDirectory->GetName(), 0) ; | |
79 | ||
80 | SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ; | |
81 | SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ; | |
82 | SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) ); | |
83 | ||
84 | fNRecParticles = 0 ; | |
85 | fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ; | |
86 | ||
87 | fResPara1 = 0.030 ; // GeV | |
88 | fResPara2 = 0.00003 ; | |
89 | fResPara3 = 0.00001 ; | |
90 | ||
91 | fPosParaA0 = 2.87 ; // mm | |
92 | fPosParaA1 = -0.0975 ; | |
93 | fPosParaB0 = 0.257 ; | |
94 | fPosParaB1 = 0.137 ; | |
95 | fPosParaB2 = 0.00619 ; | |
3decf5cb | 96 | } |
97 | ||
98 | //____________________________________________________________________________ | |
99 | AliPHOSvFast::~AliPHOSvFast() | |
100 | { | |
b2a60966 | 101 | // dtor |
3decf5cb | 102 | |
a73f33f0 | 103 | fFastRecParticles->Delete() ; |
104 | delete fFastRecParticles ; | |
105 | fFastRecParticles = 0 ; | |
3decf5cb | 106 | |
107 | } | |
108 | ||
109 | //____________________________________________________________________________ | |
a73f33f0 | 110 | void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp) |
111 | { | |
b2a60966 | 112 | // Add a virtually reconstructed particle to the list |
113 | ||
f96d3dc7 | 114 | new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ; |
115 | fNRecParticles++ ; | |
3decf5cb | 116 | } |
117 | ||
118 | //____________________________________________________________________________ | |
119 | void AliPHOSvFast::BuildGeometry() | |
120 | { | |
3decf5cb | 121 | // Build the PHOS geometry for the ROOT display |
b2a60966 | 122 | //BEGIN_HTML |
123 | /* | |
124 | <H2> | |
125 | PHOS FAST in ALICE displayed by root | |
126 | </H2> | |
127 | <H4> All Views </H4> | |
128 | <P> | |
129 | <CENTER> | |
130 | <IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif"> | |
131 | </CENTER></P> | |
132 | <H4> Front View </H4> | |
133 | <P> | |
134 | <CENTER> | |
135 | <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif"> | |
136 | </CENTER></P> | |
137 | */ | |
138 | //END_HTML | |
139 | ||
3decf5cb | 140 | const Int_t kColorPHOS = kRed ; |
141 | ||
142 | Double_t const kRADDEG = 180.0 / kPI ; | |
143 | ||
144 | new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2, | |
145 | GetBigBox(1)/2, | |
146 | GetBigBox(2)/2 ); | |
147 | ||
148 | // position PHOS into ALICE | |
149 | ||
fa7cce36 | 150 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
3decf5cb | 151 | Int_t number = 988 ; |
fa7cce36 | 152 | Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ; |
3decf5cb | 153 | pphi *= kRADDEG ; |
154 | TNode * top = gAlice->GetGeometry()->GetNode("alice") ; | |
155 | ||
156 | char * nodename = new char[20] ; | |
157 | char * rotname = new char[20] ; | |
158 | ||
fa7cce36 | 159 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
160 | Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ; | |
3decf5cb | 161 | sprintf(rotname, "%s%d", "rot", number++) ; |
162 | new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0); | |
163 | top->cd(); | |
164 | sprintf(nodename,"%s%d", "Module", i) ; | |
165 | Float_t x = r * TMath::Sin( angle / kRADDEG ) ; | |
166 | Float_t y = -r * TMath::Cos( angle / kRADDEG ) ; | |
167 | TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ; | |
168 | bigboxnode->SetLineColor(kColorPHOS) ; | |
169 | fNodes->Add(bigboxnode) ; | |
170 | } | |
171 | delete[] nodename ; | |
172 | delete[] rotname ; | |
173 | } | |
174 | ||
175 | //____________________________________________________________________________ | |
176 | void AliPHOSvFast::CreateGeometry() | |
177 | { | |
b2a60966 | 178 | // Create the geometry for GEANT |
179 | ||
3decf5cb | 180 | AliPHOSvFast *phostmp = (AliPHOSvFast*)gAlice->GetModule("PHOS") ; |
b2a60966 | 181 | |
3decf5cb | 182 | if ( phostmp == NULL ) { |
183 | ||
184 | fprintf(stderr, "PHOS detector not found!\n") ; | |
185 | return ; | |
186 | ||
187 | } | |
188 | ||
189 | // Get pointer to the array containing media indeces | |
190 | Int_t *idtmed = fIdtmed->GetArray() - 699 ; | |
191 | ||
192 | Float_t bigbox[3] ; | |
193 | bigbox[0] = GetBigBox(0) / 2.0 ; | |
194 | bigbox[1] = GetBigBox(1) / 2.0 ; | |
195 | bigbox[2] = GetBigBox(2) / 2.0 ; | |
196 | ||
197 | gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ; | |
198 | ||
199 | // --- Position PHOS mdules in ALICE setup --- | |
200 | ||
201 | Int_t idrotm[99] ; | |
202 | Double_t const kRADDEG = 180.0 / kPI ; | |
203 | ||
fa7cce36 | 204 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
3decf5cb | 205 | |
fa7cce36 | 206 | Float_t angle = GetGeometry()->GetPHOSAngle(i) ; |
3decf5cb | 207 | AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ; |
208 | ||
fa7cce36 | 209 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
3decf5cb | 210 | |
211 | Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ; | |
212 | Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ; | |
3decf5cb | 213 | gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ; |
214 | ||
215 | } // for GetNModules | |
216 | ||
217 | } | |
218 | ||
219 | ||
220 | //____________________________________________________________________________ | |
221 | void AliPHOSvFast::Init(void) | |
222 | { | |
b2a60966 | 223 | // Prints out an information message |
224 | ||
3decf5cb | 225 | Int_t i; |
226 | ||
227 | printf("\n"); | |
228 | for(i=0;i<35;i++) printf("*"); | |
229 | printf(" FAST PHOS_INIT "); | |
230 | for(i=0;i<35;i++) printf("*"); | |
231 | printf("\n"); | |
232 | ||
233 | // Here the PHOS initialisation code (if any!) | |
234 | ||
235 | for(i=0;i<80;i++) printf("*"); | |
236 | printf("\n"); | |
237 | ||
238 | } | |
239 | ||
240 | //___________________________________________________________________________ | |
3a4295ee | 241 | Float_t AliPHOSvFast::GetBigBox(Int_t index) const |
3decf5cb | 242 | { |
b2a60966 | 243 | // Get the X, Y or Z dimension of the box describing a PHOS module |
244 | ||
3decf5cb | 245 | Float_t rv = 0 ; |
246 | ||
247 | switch (index) { | |
248 | case 0: | |
249 | rv = fBigBoxX ; | |
250 | break ; | |
251 | case 1: | |
252 | rv = fBigBoxY ; | |
253 | break ; | |
254 | case 2: | |
255 | rv = fBigBoxZ ; | |
256 | break ; | |
257 | } | |
258 | return rv ; | |
259 | } | |
260 | ||
261 | //___________________________________________________________________________ | |
9e1a0ddb | 262 | void AliPHOSvFast::MakeBranch(Option_t* opt, const char *file) |
3decf5cb | 263 | { |
b2a60966 | 264 | // Create new branch in the current reconstructed Root Tree |
f96d3dc7 | 265 | |
2ab0c725 | 266 | AliDetector::MakeBranch(opt,file) ; |
3decf5cb | 267 | |
268 | char branchname[10]; | |
269 | sprintf(branchname,"%s",GetName()); | |
3a4295ee | 270 | const char *cd = strstr(opt,"R"); |
3decf5cb | 271 | |
a73f33f0 | 272 | if (fFastRecParticles && gAlice->TreeR() && cd) { |
9e1a0ddb | 273 | MakeBranchInTree(gAlice->TreeR(), |
274 | branchname, &fFastRecParticles, fBufferSize, file); | |
3decf5cb | 275 | } |
276 | } | |
277 | ||
a73f33f0 | 278 | //____________________________________________________________________________ |
279 | Double_t AliPHOSvFast::MakeEnergy(const Double_t energy) | |
280 | { | |
b2a60966 | 281 | // Smears the energy according to the energy dependent energy resolution. |
282 | // A gaussian distribution is assumed | |
283 | ||
b1aa729d | 284 | Double_t sigma = SigmaE(energy) ; |
285 | return fRan.Gaus(energy, sigma) ; | |
a73f33f0 | 286 | } |
287 | ||
288 | //____________________________________________________________________________ | |
b1aa729d | 289 | TVector3 AliPHOSvFast::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi) |
a73f33f0 | 290 | { |
b2a60966 | 291 | // Smears the impact position according to the energy dependent position resolution |
292 | // A gaussian position distribution is assumed | |
293 | ||
b1aa729d | 294 | TVector3 newpos ; |
295 | Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ; | |
296 | Double_t x = fRan.Gaus( pos.X(), sigma ) ; | |
297 | sigma = SigmaP( energy, phi*180./TMath::Pi() ) ; | |
298 | Double_t z = fRan.Gaus( pos.Z(), sigma ) ; | |
299 | Double_t y = pos.Y() ; | |
300 | ||
301 | newpos.SetX(x) ; | |
302 | newpos.SetY(y) ; | |
303 | newpos.SetZ(z) ; | |
304 | ||
305 | return newpos ; | |
306 | } | |
a73f33f0 | 307 | |
b1aa729d | 308 | //____________________________________________________________________________ |
309 | void AliPHOSvFast::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp) | |
310 | { | |
b2a60966 | 311 | // Modify the primary particle properties according |
312 | // 1. the response function of PHOS | |
313 | // 2. the performance of the EMC+PPSD setup | |
314 | ||
b1aa729d | 315 | Int_t type = MakeType( rp ) ; |
a73f33f0 | 316 | rp.SetType(type) ; |
317 | ||
318 | ||
319 | // get the detected energy | |
320 | ||
321 | TLorentzVector momentum ; | |
322 | rp.Momentum(momentum) ; | |
323 | Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ; | |
324 | Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ; | |
b1aa729d | 325 | Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2) |
326 | + TMath::Power( rp.GetMass(), 2) ) ; | |
327 | ||
328 | // get the angle of incidence | |
329 | ||
330 | Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ; | |
fa7cce36 | 331 | Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ; |
b1aa729d | 332 | |
333 | // get the detected direction | |
334 | ||
335 | TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ; | |
336 | modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ; | |
337 | ||
338 | // Set the modified 4-momentum of the reconstructed particle | |
339 | ||
340 | rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ; | |
341 | ||
a73f33f0 | 342 | } |
343 | ||
344 | //____________________________________________________________________________ | |
b1aa729d | 345 | Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp ) |
a73f33f0 | 346 | { |
b2a60966 | 347 | // Generate a particle type using the performance of the EMC+PPSD setup |
348 | ||
9ec91567 | 349 | Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ; |
b1aa729d | 350 | Int_t charge = (Int_t)rp.GetPDG()->Charge() ; |
351 | Int_t test ; | |
352 | Float_t ran ; | |
f96d3dc7 | 353 | if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) ) |
b1aa729d | 354 | test = - 1 ; |
355 | else | |
356 | test = rp.GetPdgCode() ; | |
357 | ||
3a4295ee | 358 | cout << " SHOULD NOT BE USED until values of probabilities are properly set " << endl ; |
359 | assert(1==0) ; // NB: ALL VALUES SHOLD BE CHECKED !!!! | |
b1aa729d | 360 | switch (test) { |
361 | ||
3a4295ee | 362 | case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!! |
b1aa729d | 363 | ran = fRan.Rndm() ; |
3a4295ee | 364 | if( ran <= 0.9498 ) |
365 | rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ; | |
366 | else | |
367 | rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ; | |
b1aa729d | 368 | break ; |
369 | ||
370 | case 2112: // it's a neutron | |
371 | ran = fRan.Rndm() ; | |
372 | if ( ran <= 0.9998 ) | |
3a4295ee | 373 | rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ; |
b1aa729d | 374 | else |
3a4295ee | 375 | rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; |
b1aa729d | 376 | break ; |
3a4295ee | 377 | |
b1aa729d | 378 | case -2112: // it's a anti-neutron |
379 | ran = fRan.Rndm() ; | |
380 | if ( ran <= 0.9984 ) | |
3a4295ee | 381 | rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ; |
b1aa729d | 382 | else |
3a4295ee | 383 | rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; |
b1aa729d | 384 | break ; |
385 | ||
386 | case 11: // it's a electron | |
387 | ran = fRan.Rndm() ; | |
388 | if ( ran <= 0.9996 ) | |
3a4295ee | 389 | rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ; |
b1aa729d | 390 | else |
3a4295ee | 391 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 392 | break; |
393 | ||
f96d3dc7 | 394 | case -11: // it's a positon |
b1aa729d | 395 | ran = fRan.Rndm() ; |
396 | if ( ran <= 0.9996 ) | |
3a4295ee | 397 | rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ; |
b1aa729d | 398 | else |
3a4295ee | 399 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 400 | break; |
401 | ||
402 | case -1: // it's a charged | |
403 | ran = fRan.Rndm() ; | |
404 | if ( ran <= 0.9996 ) | |
3a4295ee | 405 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 406 | else |
3a4295ee | 407 | rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ; |
b1aa729d | 408 | |
409 | break ; | |
410 | } | |
411 | ||
412 | ||
a73f33f0 | 413 | return rv ; |
414 | } | |
415 | ||
f96d3dc7 | 416 | //___________________________________________________________________________ |
417 | void AliPHOSvFast::ResetPoints() | |
418 | { | |
b2a60966 | 419 | // This overloads the method in AliDetector |
420 | ||
f96d3dc7 | 421 | ResetFastRecParticles() ; |
422 | } | |
423 | ||
424 | //___________________________________________________________________________ | |
425 | void AliPHOSvFast::ResetFastRecParticles() | |
426 | { | |
b2a60966 | 427 | // Resets the list of virtual reconstructed particles |
428 | ||
f96d3dc7 | 429 | if (fFastRecParticles) |
430 | fFastRecParticles->Clear() ; | |
431 | fNRecParticles = 0 ; | |
432 | } | |
433 | ||
3decf5cb | 434 | //___________________________________________________________________________ |
435 | void AliPHOSvFast::SetBigBox(Int_t index, Float_t value) | |
436 | { | |
b2a60966 | 437 | // Set the size of the Box describing a PHOS module |
438 | ||
3decf5cb | 439 | switch (index) { |
440 | case 0: | |
441 | fBigBoxX = value ; | |
442 | break ; | |
443 | case 1: | |
444 | fBigBoxY = value ; | |
445 | break ; | |
446 | case 2: | |
447 | fBigBoxZ = value ; | |
448 | break ; | |
449 | } | |
450 | ||
451 | } | |
452 | ||
a73f33f0 | 453 | //____________________________________________________________________________ |
454 | Double_t AliPHOSvFast::SigmaE(Double_t energy) | |
455 | { | |
b2a60966 | 456 | // Calculates the energy dependent energy resolution |
457 | ||
a73f33f0 | 458 | Double_t rv = -1 ; |
459 | ||
460 | rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2) | |
461 | + TMath::Power(fResPara2/TMath::Sqrt(energy), 2) | |
462 | + TMath::Power(fResPara3, 2) ) ; | |
463 | ||
464 | return rv * energy ; | |
465 | } | |
466 | ||
b1aa729d | 467 | //____________________________________________________________________________ |
7a9d98f9 | 468 | Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence) |
b1aa729d | 469 | { |
b2a60966 | 470 | // Calculates the energy dependent position resolution |
471 | ||
b1aa729d | 472 | Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ; |
473 | Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ; | |
474 | ||
475 | return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm | |
476 | } | |
477 | ||
3decf5cb | 478 | //____________________________________________________________________________ |
479 | void AliPHOSvFast::StepManager(void) | |
480 | { | |
b2a60966 | 481 | // Only verifies if the particle reaches PHOS and stops the tracking |
3a4295ee | 482 | |
a73f33f0 | 483 | TLorentzVector lv ; |
484 | gMC->TrackPosition(lv) ; | |
b1aa729d | 485 | TVector3 pos = lv.Vect() ; |
486 | Int_t modid ; | |
487 | gMC->CurrentVolID(modid); | |
a73f33f0 | 488 | |
3a4295ee | 489 | Float_t energy = gMC->Etot() ; //Total energy of current track |
3decf5cb | 490 | |
3a4295ee | 491 | //Calculating mass of current particle |
492 | TDatabasePDG * pdg = TDatabasePDG::Instance() ; | |
493 | TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ; | |
494 | Float_t mass = partPDG->Mass() ; | |
a73f33f0 | 495 | |
3a4295ee | 496 | if(energy > mass){ |
497 | pos.SetMag(TMath::Sqrt(energy*energy-mass*mass)) ; | |
498 | TLorentzVector pTrack(pos, energy) ; | |
a73f33f0 | 499 | |
3a4295ee | 500 | TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ; |
501 | ||
502 | AliPHOSFastRecParticle rp(*part) ; | |
b1aa729d | 503 | |
3a4295ee | 504 | // Adds the response of PHOS to the particle |
505 | MakeRecParticle(modid, pos, rp) ; | |
506 | ||
507 | // add the `track' particle to the FastRecParticles list | |
b1aa729d | 508 | |
3a4295ee | 509 | AddRecParticle(rp) ; |
a73f33f0 | 510 | |
3a4295ee | 511 | part->Delete() ; |
512 | } | |
a73f33f0 | 513 | // stop the track as soon PHOS is reached |
b1aa729d | 514 | |
3decf5cb | 515 | gMC->StopTrack() ; |
516 | ||
517 | } | |
518 |