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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 "TGeometry.h" |
3decf5cb | 33 | |
34 | // --- Standard library --- | |
35 | ||
3decf5cb | 36 | // --- AliRoot header files --- |
3a4295ee | 37 | #include "AliPHOSFastRecParticle.h" |
3decf5cb | 38 | #include "AliPHOSvFast.h" |
3a4295ee | 39 | #include "AliPHOSGetter.h" |
3decf5cb | 40 | #include "AliRun.h" |
3decf5cb | 41 | |
42 | ClassImp(AliPHOSvFast) | |
43 | ||
44 | //____________________________________________________________________________ | |
3a4295ee | 45 | AliPHOSvFast::AliPHOSvFast() : AliPHOS() |
3decf5cb | 46 | { |
3a4295ee | 47 | // default ctor : initialize data member |
48 | fBigBoxX = 0. ; | |
49 | fBigBoxY = 0. ; | |
50 | fBigBoxZ = 0. ; | |
51 | fFastRecParticles = 0 ; | |
52 | fNRecParticles = 0 ; | |
53 | fRan = 0 ; | |
54 | fResPara1 = 0. ; | |
55 | fResPara2 = 0. ; | |
56 | fResPara3 = 0. ; | |
57 | fPosParaA0 = 0. ; | |
58 | fPosParaA1 = 0. ; | |
59 | fPosParaB0 = 0. ; | |
60 | fPosParaB1 = 0. ; | |
61 | fPosParaB2 = 0. ; | |
b2a60966 | 62 | |
3decf5cb | 63 | } |
64 | ||
65 | //____________________________________________________________________________ | |
66 | AliPHOSvFast::AliPHOSvFast(const char *name, const char *title): | |
67 | AliPHOS(name,title) | |
68 | { | |
b2a60966 | 69 | // ctor |
70 | ||
3decf5cb | 71 | |
7a9d98f9 | 72 | // create the Getter |
73 | AliPHOSGetter::GetInstance(gDirectory->GetName(), 0) ; | |
74 | ||
75 | SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ; | |
76 | SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ; | |
77 | SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) ); | |
78 | ||
79 | fNRecParticles = 0 ; | |
80 | fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ; | |
81 | ||
82 | fResPara1 = 0.030 ; // GeV | |
83 | fResPara2 = 0.00003 ; | |
84 | fResPara3 = 0.00001 ; | |
85 | ||
86 | fPosParaA0 = 2.87 ; // mm | |
87 | fPosParaA1 = -0.0975 ; | |
88 | fPosParaB0 = 0.257 ; | |
89 | fPosParaB1 = 0.137 ; | |
90 | fPosParaB2 = 0.00619 ; | |
3decf5cb | 91 | } |
92 | ||
dfd57ff8 | 93 | //____________________________________________________________________________ |
94 | AliPHOSvFast::AliPHOSvFast(const AliPHOSvFast & pv): | |
95 | AliPHOS(pv.GetName(), pv.GetTitle()) | |
96 | { | |
97 | // cpy ctor | |
98 | ||
99 | ||
100 | // create the Getter | |
101 | AliPHOSGetter::GetInstance(gDirectory->GetName(), 0) ; | |
102 | ||
103 | SetBigBox(0, pv.fBigBoxX) ; | |
104 | SetBigBox(1, pv.fBigBoxY) ; | |
105 | SetBigBox(2, pv.fBigBoxZ) ; | |
106 | ||
107 | fNRecParticles = pv.fNRecParticles; | |
108 | fFastRecParticles = new TClonesArray( *(pv.fFastRecParticles) ) ; | |
109 | ||
110 | fResPara1 = pv.fResPara1 ; | |
111 | fResPara2 = pv.fResPara2 ; | |
112 | fResPara3 = pv.fResPara3 ; | |
113 | ||
114 | fPosParaA0 = pv.fPosParaA0 ; | |
115 | fPosParaA1 = pv.fPosParaA1 ; | |
116 | fPosParaB0 = pv.fPosParaB0 ; | |
117 | fPosParaB1 = pv.fPosParaB1 ; | |
118 | fPosParaB2 = pv.fPosParaB2 ; | |
119 | } | |
120 | ||
3decf5cb | 121 | //____________________________________________________________________________ |
122 | AliPHOSvFast::~AliPHOSvFast() | |
123 | { | |
b2a60966 | 124 | // dtor |
3decf5cb | 125 | |
a73f33f0 | 126 | fFastRecParticles->Delete() ; |
127 | delete fFastRecParticles ; | |
128 | fFastRecParticles = 0 ; | |
3decf5cb | 129 | |
130 | } | |
131 | ||
132 | //____________________________________________________________________________ | |
a73f33f0 | 133 | void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp) |
134 | { | |
b2a60966 | 135 | // Add a virtually reconstructed particle to the list |
136 | ||
f96d3dc7 | 137 | new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ; |
138 | fNRecParticles++ ; | |
3decf5cb | 139 | } |
140 | ||
141 | //____________________________________________________________________________ | |
142 | void AliPHOSvFast::BuildGeometry() | |
143 | { | |
3decf5cb | 144 | // Build the PHOS geometry for the ROOT display |
b2a60966 | 145 | //BEGIN_HTML |
146 | /* | |
147 | <H2> | |
148 | PHOS FAST in ALICE displayed by root | |
149 | </H2> | |
150 | <H4> All Views </H4> | |
151 | <P> | |
152 | <CENTER> | |
153 | <IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif"> | |
154 | </CENTER></P> | |
155 | <H4> Front View </H4> | |
156 | <P> | |
157 | <CENTER> | |
158 | <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif"> | |
159 | </CENTER></P> | |
160 | */ | |
161 | //END_HTML | |
162 | ||
3decf5cb | 163 | const Int_t kColorPHOS = kRed ; |
164 | ||
165 | Double_t const kRADDEG = 180.0 / kPI ; | |
166 | ||
167 | new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2, | |
168 | GetBigBox(1)/2, | |
169 | GetBigBox(2)/2 ); | |
170 | ||
171 | // position PHOS into ALICE | |
172 | ||
fa7cce36 | 173 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
3decf5cb | 174 | Int_t number = 988 ; |
fa7cce36 | 175 | Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ; |
3decf5cb | 176 | pphi *= kRADDEG ; |
177 | TNode * top = gAlice->GetGeometry()->GetNode("alice") ; | |
178 | ||
179 | char * nodename = new char[20] ; | |
180 | char * rotname = new char[20] ; | |
181 | ||
fa7cce36 | 182 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
183 | Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ; | |
3decf5cb | 184 | sprintf(rotname, "%s%d", "rot", number++) ; |
185 | new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0); | |
186 | top->cd(); | |
187 | sprintf(nodename,"%s%d", "Module", i) ; | |
188 | Float_t x = r * TMath::Sin( angle / kRADDEG ) ; | |
189 | Float_t y = -r * TMath::Cos( angle / kRADDEG ) ; | |
190 | TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ; | |
191 | bigboxnode->SetLineColor(kColorPHOS) ; | |
192 | fNodes->Add(bigboxnode) ; | |
193 | } | |
194 | delete[] nodename ; | |
195 | delete[] rotname ; | |
196 | } | |
197 | ||
198 | //____________________________________________________________________________ | |
199 | void AliPHOSvFast::CreateGeometry() | |
200 | { | |
b2a60966 | 201 | // Create the geometry for GEANT |
202 | ||
3decf5cb | 203 | AliPHOSvFast *phostmp = (AliPHOSvFast*)gAlice->GetModule("PHOS") ; |
b2a60966 | 204 | |
3decf5cb | 205 | if ( phostmp == NULL ) { |
206 | ||
207 | fprintf(stderr, "PHOS detector not found!\n") ; | |
208 | return ; | |
209 | ||
210 | } | |
211 | ||
212 | // Get pointer to the array containing media indeces | |
213 | Int_t *idtmed = fIdtmed->GetArray() - 699 ; | |
214 | ||
215 | Float_t bigbox[3] ; | |
216 | bigbox[0] = GetBigBox(0) / 2.0 ; | |
217 | bigbox[1] = GetBigBox(1) / 2.0 ; | |
218 | bigbox[2] = GetBigBox(2) / 2.0 ; | |
219 | ||
220 | gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ; | |
221 | ||
222 | // --- Position PHOS mdules in ALICE setup --- | |
223 | ||
224 | Int_t idrotm[99] ; | |
225 | Double_t const kRADDEG = 180.0 / kPI ; | |
226 | ||
fa7cce36 | 227 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
3decf5cb | 228 | |
fa7cce36 | 229 | Float_t angle = GetGeometry()->GetPHOSAngle(i) ; |
3decf5cb | 230 | AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ; |
231 | ||
fa7cce36 | 232 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
3decf5cb | 233 | |
234 | Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ; | |
235 | Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ; | |
3decf5cb | 236 | gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ; |
237 | ||
238 | } // for GetNModules | |
239 | ||
240 | } | |
241 | ||
242 | ||
243 | //____________________________________________________________________________ | |
244 | void AliPHOSvFast::Init(void) | |
245 | { | |
b2a60966 | 246 | // Prints out an information message |
247 | ||
3decf5cb | 248 | Int_t i; |
249 | ||
250 | printf("\n"); | |
251 | for(i=0;i<35;i++) printf("*"); | |
252 | printf(" FAST PHOS_INIT "); | |
253 | for(i=0;i<35;i++) printf("*"); | |
254 | printf("\n"); | |
255 | ||
256 | // Here the PHOS initialisation code (if any!) | |
257 | ||
258 | for(i=0;i<80;i++) printf("*"); | |
259 | printf("\n"); | |
260 | ||
261 | } | |
262 | ||
263 | //___________________________________________________________________________ | |
3a4295ee | 264 | Float_t AliPHOSvFast::GetBigBox(Int_t index) const |
3decf5cb | 265 | { |
b2a60966 | 266 | // Get the X, Y or Z dimension of the box describing a PHOS module |
267 | ||
3decf5cb | 268 | Float_t rv = 0 ; |
269 | ||
270 | switch (index) { | |
271 | case 0: | |
272 | rv = fBigBoxX ; | |
273 | break ; | |
274 | case 1: | |
275 | rv = fBigBoxY ; | |
276 | break ; | |
277 | case 2: | |
278 | rv = fBigBoxZ ; | |
279 | break ; | |
280 | } | |
281 | return rv ; | |
282 | } | |
283 | ||
284 | //___________________________________________________________________________ | |
9e1a0ddb | 285 | void AliPHOSvFast::MakeBranch(Option_t* opt, const char *file) |
3decf5cb | 286 | { |
b2a60966 | 287 | // Create new branch in the current reconstructed Root Tree |
f96d3dc7 | 288 | |
2ab0c725 | 289 | AliDetector::MakeBranch(opt,file) ; |
3decf5cb | 290 | |
291 | char branchname[10]; | |
292 | sprintf(branchname,"%s",GetName()); | |
3a4295ee | 293 | const char *cd = strstr(opt,"R"); |
3decf5cb | 294 | |
a73f33f0 | 295 | if (fFastRecParticles && gAlice->TreeR() && cd) { |
9e1a0ddb | 296 | MakeBranchInTree(gAlice->TreeR(), |
297 | branchname, &fFastRecParticles, fBufferSize, file); | |
3decf5cb | 298 | } |
299 | } | |
300 | ||
a73f33f0 | 301 | //____________________________________________________________________________ |
302 | Double_t AliPHOSvFast::MakeEnergy(const Double_t energy) | |
303 | { | |
b2a60966 | 304 | // Smears the energy according to the energy dependent energy resolution. |
305 | // A gaussian distribution is assumed | |
306 | ||
b1aa729d | 307 | Double_t sigma = SigmaE(energy) ; |
308 | return fRan.Gaus(energy, sigma) ; | |
a73f33f0 | 309 | } |
310 | ||
311 | //____________________________________________________________________________ | |
b1aa729d | 312 | TVector3 AliPHOSvFast::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi) |
a73f33f0 | 313 | { |
b2a60966 | 314 | // Smears the impact position according to the energy dependent position resolution |
315 | // A gaussian position distribution is assumed | |
316 | ||
b1aa729d | 317 | TVector3 newpos ; |
318 | Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ; | |
319 | Double_t x = fRan.Gaus( pos.X(), sigma ) ; | |
320 | sigma = SigmaP( energy, phi*180./TMath::Pi() ) ; | |
321 | Double_t z = fRan.Gaus( pos.Z(), sigma ) ; | |
322 | Double_t y = pos.Y() ; | |
323 | ||
324 | newpos.SetX(x) ; | |
325 | newpos.SetY(y) ; | |
326 | newpos.SetZ(z) ; | |
327 | ||
328 | return newpos ; | |
329 | } | |
a73f33f0 | 330 | |
b1aa729d | 331 | //____________________________________________________________________________ |
332 | void AliPHOSvFast::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp) | |
333 | { | |
b2a60966 | 334 | // Modify the primary particle properties according |
335 | // 1. the response function of PHOS | |
336 | // 2. the performance of the EMC+PPSD setup | |
337 | ||
b1aa729d | 338 | Int_t type = MakeType( rp ) ; |
a73f33f0 | 339 | rp.SetType(type) ; |
340 | ||
341 | ||
342 | // get the detected energy | |
343 | ||
344 | TLorentzVector momentum ; | |
345 | rp.Momentum(momentum) ; | |
346 | Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ; | |
347 | Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ; | |
b1aa729d | 348 | Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2) |
349 | + TMath::Power( rp.GetMass(), 2) ) ; | |
350 | ||
351 | // get the angle of incidence | |
352 | ||
353 | Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ; | |
fa7cce36 | 354 | Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ; |
b1aa729d | 355 | |
356 | // get the detected direction | |
357 | ||
358 | TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ; | |
359 | modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ; | |
360 | ||
361 | // Set the modified 4-momentum of the reconstructed particle | |
362 | ||
363 | rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ; | |
364 | ||
a73f33f0 | 365 | } |
366 | ||
367 | //____________________________________________________________________________ | |
b1aa729d | 368 | Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp ) |
a73f33f0 | 369 | { |
b2a60966 | 370 | // Generate a particle type using the performance of the EMC+PPSD setup |
371 | ||
9ec91567 | 372 | Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ; |
b1aa729d | 373 | Int_t charge = (Int_t)rp.GetPDG()->Charge() ; |
374 | Int_t test ; | |
375 | Float_t ran ; | |
f96d3dc7 | 376 | if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) ) |
b1aa729d | 377 | test = - 1 ; |
378 | else | |
379 | test = rp.GetPdgCode() ; | |
380 | ||
dfd57ff8 | 381 | Fatal("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ; |
382 | ||
b1aa729d | 383 | switch (test) { |
384 | ||
3a4295ee | 385 | case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!! |
b1aa729d | 386 | ran = fRan.Rndm() ; |
3a4295ee | 387 | if( ran <= 0.9498 ) |
388 | rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ; | |
389 | else | |
390 | rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ; | |
b1aa729d | 391 | break ; |
392 | ||
393 | case 2112: // it's a neutron | |
394 | ran = fRan.Rndm() ; | |
395 | if ( ran <= 0.9998 ) | |
3a4295ee | 396 | rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ; |
b1aa729d | 397 | else |
3a4295ee | 398 | rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; |
b1aa729d | 399 | break ; |
3a4295ee | 400 | |
b1aa729d | 401 | case -2112: // it's a anti-neutron |
402 | ran = fRan.Rndm() ; | |
403 | if ( ran <= 0.9984 ) | |
3a4295ee | 404 | rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ; |
b1aa729d | 405 | else |
3a4295ee | 406 | rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; |
b1aa729d | 407 | break ; |
408 | ||
409 | case 11: // it's a electron | |
410 | ran = fRan.Rndm() ; | |
411 | if ( ran <= 0.9996 ) | |
3a4295ee | 412 | rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ; |
b1aa729d | 413 | else |
3a4295ee | 414 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 415 | break; |
416 | ||
f96d3dc7 | 417 | case -11: // it's a positon |
b1aa729d | 418 | ran = fRan.Rndm() ; |
419 | if ( ran <= 0.9996 ) | |
3a4295ee | 420 | rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ; |
b1aa729d | 421 | else |
3a4295ee | 422 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 423 | break; |
424 | ||
425 | case -1: // it's a charged | |
426 | ran = fRan.Rndm() ; | |
427 | if ( ran <= 0.9996 ) | |
3a4295ee | 428 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 429 | else |
3a4295ee | 430 | rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ; |
b1aa729d | 431 | |
432 | break ; | |
433 | } | |
434 | ||
435 | ||
a73f33f0 | 436 | return rv ; |
437 | } | |
438 | ||
f96d3dc7 | 439 | //___________________________________________________________________________ |
440 | void AliPHOSvFast::ResetPoints() | |
441 | { | |
b2a60966 | 442 | // This overloads the method in AliDetector |
443 | ||
f96d3dc7 | 444 | ResetFastRecParticles() ; |
445 | } | |
446 | ||
447 | //___________________________________________________________________________ | |
448 | void AliPHOSvFast::ResetFastRecParticles() | |
449 | { | |
b2a60966 | 450 | // Resets the list of virtual reconstructed particles |
451 | ||
f96d3dc7 | 452 | if (fFastRecParticles) |
453 | fFastRecParticles->Clear() ; | |
454 | fNRecParticles = 0 ; | |
455 | } | |
456 | ||
3decf5cb | 457 | //___________________________________________________________________________ |
458 | void AliPHOSvFast::SetBigBox(Int_t index, Float_t value) | |
459 | { | |
b2a60966 | 460 | // Set the size of the Box describing a PHOS module |
461 | ||
3decf5cb | 462 | switch (index) { |
463 | case 0: | |
464 | fBigBoxX = value ; | |
465 | break ; | |
466 | case 1: | |
467 | fBigBoxY = value ; | |
468 | break ; | |
469 | case 2: | |
470 | fBigBoxZ = value ; | |
471 | break ; | |
472 | } | |
473 | ||
474 | } | |
475 | ||
a73f33f0 | 476 | //____________________________________________________________________________ |
477 | Double_t AliPHOSvFast::SigmaE(Double_t energy) | |
478 | { | |
b2a60966 | 479 | // Calculates the energy dependent energy resolution |
480 | ||
a73f33f0 | 481 | Double_t rv = -1 ; |
482 | ||
483 | rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2) | |
484 | + TMath::Power(fResPara2/TMath::Sqrt(energy), 2) | |
485 | + TMath::Power(fResPara3, 2) ) ; | |
486 | ||
487 | return rv * energy ; | |
488 | } | |
489 | ||
b1aa729d | 490 | //____________________________________________________________________________ |
7a9d98f9 | 491 | Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence) |
b1aa729d | 492 | { |
b2a60966 | 493 | // Calculates the energy dependent position resolution |
494 | ||
b1aa729d | 495 | Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ; |
496 | Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ; | |
497 | ||
498 | return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm | |
499 | } | |
500 | ||
3decf5cb | 501 | //____________________________________________________________________________ |
502 | void AliPHOSvFast::StepManager(void) | |
503 | { | |
b2a60966 | 504 | // Only verifies if the particle reaches PHOS and stops the tracking |
3a4295ee | 505 | |
a73f33f0 | 506 | TLorentzVector lv ; |
507 | gMC->TrackPosition(lv) ; | |
b1aa729d | 508 | TVector3 pos = lv.Vect() ; |
509 | Int_t modid ; | |
510 | gMC->CurrentVolID(modid); | |
a73f33f0 | 511 | |
3a4295ee | 512 | Float_t energy = gMC->Etot() ; //Total energy of current track |
3decf5cb | 513 | |
3a4295ee | 514 | //Calculating mass of current particle |
515 | TDatabasePDG * pdg = TDatabasePDG::Instance() ; | |
516 | TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ; | |
517 | Float_t mass = partPDG->Mass() ; | |
a73f33f0 | 518 | |
3a4295ee | 519 | if(energy > mass){ |
520 | pos.SetMag(TMath::Sqrt(energy*energy-mass*mass)) ; | |
521 | TLorentzVector pTrack(pos, energy) ; | |
a73f33f0 | 522 | |
3a4295ee | 523 | TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ; |
524 | ||
525 | AliPHOSFastRecParticle rp(*part) ; | |
b1aa729d | 526 | |
3a4295ee | 527 | // Adds the response of PHOS to the particle |
528 | MakeRecParticle(modid, pos, rp) ; | |
529 | ||
530 | // add the `track' particle to the FastRecParticles list | |
b1aa729d | 531 | |
3a4295ee | 532 | AddRecParticle(rp) ; |
a73f33f0 | 533 | |
3a4295ee | 534 | part->Delete() ; |
535 | } | |
a73f33f0 | 536 | // stop the track as soon PHOS is reached |
b1aa729d | 537 | |
3decf5cb | 538 | gMC->StopTrack() ; |
539 | ||
540 | } | |
541 |