]>
Commit | Line | Data |
---|---|---|
88cb7938 | 1 | /************************************************************************** |
3decf5cb | 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 | ||
702ab87e | 18 | /* History of cvs commits: |
19 | * | |
20 | * $Log$ | |
21 | */ | |
22 | ||
3decf5cb | 23 | //_________________________________________________________________________ |
b2a60966 | 24 | // Implementation of the PHOS manager class for fast simulations |
25 | // Tracks particles until the reach a grossly designed PHOS module | |
26 | // Modify the particles property (momentum, energy, type) according to | |
27 | // the PHOS response function. The result is called a virtual reconstructed | |
28 | // particle. | |
29 | // | |
30 | //*-- Author: Yves Schutz (SUBATECH) | |
3decf5cb | 31 | |
32 | // --- ROOT system --- | |
3a4295ee | 33 | |
88cb7938 | 34 | #include <TBRIK.h> |
88cb7938 | 35 | #include <TGeometry.h> |
36 | #include <TNode.h> | |
37 | #include <TParticle.h> | |
e957fea8 | 38 | #include "TClonesArray.h" |
88cb7938 | 39 | #include <TVirtualMC.h> |
3decf5cb | 40 | |
41 | // --- Standard library --- | |
42 | ||
3decf5cb | 43 | // --- AliRoot header files --- |
3a4295ee | 44 | #include "AliPHOSFastRecParticle.h" |
88cb7938 | 45 | #include "AliPHOSGeometry.h" |
46 | #include "AliPHOSLoader.h" | |
3decf5cb | 47 | #include "AliPHOSvFast.h" |
3decf5cb | 48 | #include "AliRun.h" |
3decf5cb | 49 | |
50 | ClassImp(AliPHOSvFast) | |
51 | ||
52 | //____________________________________________________________________________ | |
3a4295ee | 53 | AliPHOSvFast::AliPHOSvFast() : AliPHOS() |
3decf5cb | 54 | { |
3a4295ee | 55 | // default ctor : initialize data member |
56 | fBigBoxX = 0. ; | |
57 | fBigBoxY = 0. ; | |
58 | fBigBoxZ = 0. ; | |
59 | fFastRecParticles = 0 ; | |
60 | fNRecParticles = 0 ; | |
61 | fRan = 0 ; | |
62 | fResPara1 = 0. ; | |
63 | fResPara2 = 0. ; | |
64 | fResPara3 = 0. ; | |
65 | fPosParaA0 = 0. ; | |
66 | fPosParaA1 = 0. ; | |
67 | fPosParaB0 = 0. ; | |
68 | fPosParaB1 = 0. ; | |
69 | fPosParaB2 = 0. ; | |
b2a60966 | 70 | |
3decf5cb | 71 | } |
72 | ||
73 | //____________________________________________________________________________ | |
74 | AliPHOSvFast::AliPHOSvFast(const char *name, const char *title): | |
75 | AliPHOS(name,title) | |
76 | { | |
b2a60966 | 77 | // ctor |
78 | ||
3decf5cb | 79 | |
88cb7938 | 80 | // create the Loader |
7a9d98f9 | 81 | |
82 | SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ; | |
83 | SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ; | |
84 | SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) ); | |
85 | ||
86 | fNRecParticles = 0 ; | |
87 | fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ; | |
88 | ||
89 | fResPara1 = 0.030 ; // GeV | |
90 | fResPara2 = 0.00003 ; | |
91 | fResPara3 = 0.00001 ; | |
92 | ||
93 | fPosParaA0 = 2.87 ; // mm | |
94 | fPosParaA1 = -0.0975 ; | |
95 | fPosParaB0 = 0.257 ; | |
96 | fPosParaB1 = 0.137 ; | |
97 | fPosParaB2 = 0.00619 ; | |
3decf5cb | 98 | } |
99 | ||
100 | //____________________________________________________________________________ | |
101 | AliPHOSvFast::~AliPHOSvFast() | |
102 | { | |
b2a60966 | 103 | // dtor |
3decf5cb | 104 | |
a73f33f0 | 105 | fFastRecParticles->Delete() ; |
106 | delete fFastRecParticles ; | |
107 | fFastRecParticles = 0 ; | |
3decf5cb | 108 | |
109 | } | |
110 | ||
780fda6d | 111 | //____________________________________________________________________________ |
702ab87e | 112 | void AliPHOSvFast::Copy(TObject & base)const |
780fda6d | 113 | { |
702ab87e | 114 | TObject::Copy(base) ; |
115 | AliPHOS::Copy(base) ; | |
116 | AliPHOSvFast &fast = static_cast<AliPHOSvFast &>(base); | |
780fda6d | 117 | fast.fBigBoxX = fBigBoxX ; |
118 | fast.fBigBoxY = fBigBoxY ; | |
119 | fast.fBigBoxZ = fBigBoxZ ; | |
120 | fast.fNRecParticles = fNRecParticles ; | |
121 | fast.fRan = fRan ; | |
122 | fast.fResPara1 = fResPara1 ; | |
123 | fast.fResPara2 = fResPara2 ; | |
124 | fast.fResPara3 = fResPara3 ; | |
125 | fast.fPosParaA0 = fPosParaA0 ; | |
126 | fast.fPosParaA1 = fPosParaA1 ; | |
127 | fast.fPosParaB0 = fPosParaB0 ; | |
128 | fast.fPosParaB1 = fPosParaB1 ; | |
129 | fast.fFastRecParticles = new TClonesArray(fFastRecParticles->GetClass()->GetName(), 100) ; | |
130 | Int_t index ; | |
131 | for (index = 0 ; index < fFastRecParticles->GetEntries(); index++) | |
132 | (fast.fFastRecParticles)->AddAt(fFastRecParticles->At(index), index) ; | |
133 | } | |
134 | ||
3decf5cb | 135 | //____________________________________________________________________________ |
a73f33f0 | 136 | void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp) |
137 | { | |
b2a60966 | 138 | // Add a virtually reconstructed particle to the list |
139 | ||
f96d3dc7 | 140 | new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ; |
141 | fNRecParticles++ ; | |
3decf5cb | 142 | } |
143 | ||
144 | //____________________________________________________________________________ | |
145 | void AliPHOSvFast::BuildGeometry() | |
146 | { | |
3decf5cb | 147 | // Build the PHOS geometry for the ROOT display |
b2a60966 | 148 | //BEGIN_HTML |
149 | /* | |
150 | <H2> | |
151 | PHOS FAST in ALICE displayed by root | |
152 | </H2> | |
153 | <H4> All Views </H4> | |
154 | <P> | |
155 | <CENTER> | |
156 | <IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif"> | |
157 | </CENTER></P> | |
158 | <H4> Front View </H4> | |
159 | <P> | |
160 | <CENTER> | |
161 | <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif"> | |
162 | </CENTER></P> | |
163 | */ | |
164 | //END_HTML | |
165 | ||
3decf5cb | 166 | const Int_t kColorPHOS = kRed ; |
167 | ||
a8c47ab6 | 168 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; |
3decf5cb | 169 | |
170 | new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2, | |
171 | GetBigBox(1)/2, | |
172 | GetBigBox(2)/2 ); | |
173 | ||
174 | // position PHOS into ALICE | |
175 | ||
fa7cce36 | 176 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
3decf5cb | 177 | Int_t number = 988 ; |
fa7cce36 | 178 | Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ; |
3decf5cb | 179 | pphi *= kRADDEG ; |
180 | TNode * top = gAlice->GetGeometry()->GetNode("alice") ; | |
181 | ||
182 | char * nodename = new char[20] ; | |
183 | char * rotname = new char[20] ; | |
184 | ||
fa7cce36 | 185 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
186 | Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ; | |
3decf5cb | 187 | sprintf(rotname, "%s%d", "rot", number++) ; |
188 | new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0); | |
189 | top->cd(); | |
190 | sprintf(nodename,"%s%d", "Module", i) ; | |
191 | Float_t x = r * TMath::Sin( angle / kRADDEG ) ; | |
192 | Float_t y = -r * TMath::Cos( angle / kRADDEG ) ; | |
193 | TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ; | |
194 | bigboxnode->SetLineColor(kColorPHOS) ; | |
195 | fNodes->Add(bigboxnode) ; | |
196 | } | |
197 | delete[] nodename ; | |
198 | delete[] rotname ; | |
199 | } | |
200 | ||
201 | //____________________________________________________________________________ | |
202 | void AliPHOSvFast::CreateGeometry() | |
203 | { | |
b2a60966 | 204 | // Create the geometry for GEANT |
205 | ||
3decf5cb | 206 | AliPHOSvFast *phostmp = (AliPHOSvFast*)gAlice->GetModule("PHOS") ; |
b2a60966 | 207 | |
3decf5cb | 208 | if ( phostmp == NULL ) { |
209 | ||
210 | fprintf(stderr, "PHOS detector not found!\n") ; | |
211 | return ; | |
212 | ||
213 | } | |
214 | ||
215 | // Get pointer to the array containing media indeces | |
216 | Int_t *idtmed = fIdtmed->GetArray() - 699 ; | |
217 | ||
218 | Float_t bigbox[3] ; | |
219 | bigbox[0] = GetBigBox(0) / 2.0 ; | |
220 | bigbox[1] = GetBigBox(1) / 2.0 ; | |
221 | bigbox[2] = GetBigBox(2) / 2.0 ; | |
222 | ||
223 | gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ; | |
224 | ||
225 | // --- Position PHOS mdules in ALICE setup --- | |
226 | ||
227 | Int_t idrotm[99] ; | |
a8c47ab6 | 228 | Double_t const kRADDEG = 180.0 / TMath::Pi() ; |
3decf5cb | 229 | |
fa7cce36 | 230 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
3decf5cb | 231 | |
fa7cce36 | 232 | Float_t angle = GetGeometry()->GetPHOSAngle(i) ; |
3decf5cb | 233 | AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ; |
234 | ||
fa7cce36 | 235 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
3decf5cb | 236 | |
237 | Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ; | |
238 | Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ; | |
3decf5cb | 239 | gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ; |
240 | ||
241 | } // for GetNModules | |
242 | ||
243 | } | |
244 | ||
245 | ||
246 | //____________________________________________________________________________ | |
247 | void AliPHOSvFast::Init(void) | |
248 | { | |
b2a60966 | 249 | // Prints out an information message |
250 | ||
3decf5cb | 251 | Int_t i; |
252 | ||
253 | printf("\n"); | |
254 | for(i=0;i<35;i++) printf("*"); | |
255 | printf(" FAST PHOS_INIT "); | |
256 | for(i=0;i<35;i++) printf("*"); | |
257 | printf("\n"); | |
258 | ||
259 | // Here the PHOS initialisation code (if any!) | |
260 | ||
261 | for(i=0;i<80;i++) printf("*"); | |
262 | printf("\n"); | |
263 | ||
264 | } | |
265 | ||
266 | //___________________________________________________________________________ | |
3a4295ee | 267 | Float_t AliPHOSvFast::GetBigBox(Int_t index) const |
3decf5cb | 268 | { |
b2a60966 | 269 | // Get the X, Y or Z dimension of the box describing a PHOS module |
270 | ||
3decf5cb | 271 | Float_t rv = 0 ; |
272 | ||
273 | switch (index) { | |
274 | case 0: | |
275 | rv = fBigBoxX ; | |
276 | break ; | |
277 | case 1: | |
278 | rv = fBigBoxY ; | |
279 | break ; | |
280 | case 2: | |
281 | rv = fBigBoxZ ; | |
282 | break ; | |
283 | } | |
284 | return rv ; | |
285 | } | |
3decf5cb | 286 | //___________________________________________________________________________ |
88cb7938 | 287 | |
288 | void AliPHOSvFast::MakeBranch(Option_t* opt) | |
3decf5cb | 289 | { |
b2a60966 | 290 | // Create new branch in the current reconstructed Root Tree |
88cb7938 | 291 | AliDetector::MakeBranch(opt); |
3a4295ee | 292 | const char *cd = strstr(opt,"R"); |
3decf5cb | 293 | |
88cb7938 | 294 | if (fFastRecParticles && fLoader->TreeR() && cd) { |
295 | MakeBranchInTree(fLoader->TreeR(), GetName(), &fFastRecParticles, fBufferSize, 0); | |
3decf5cb | 296 | } |
297 | } | |
a73f33f0 | 298 | //____________________________________________________________________________ |
88cb7938 | 299 | |
fc7e2f43 | 300 | Double_t AliPHOSvFast::MakeEnergy(Double_t energy) |
a73f33f0 | 301 | { |
b2a60966 | 302 | // Smears the energy according to the energy dependent energy resolution. |
303 | // A gaussian distribution is assumed | |
304 | ||
b1aa729d | 305 | Double_t sigma = SigmaE(energy) ; |
306 | return fRan.Gaus(energy, sigma) ; | |
a73f33f0 | 307 | } |
a73f33f0 | 308 | //____________________________________________________________________________ |
88cb7938 | 309 | |
fc7e2f43 | 310 | TVector3 AliPHOSvFast::MakePosition(Double_t energy, TVector3 pos, Double_t theta, Double_t phi) |
a73f33f0 | 311 | { |
b2a60966 | 312 | // Smears the impact position according to the energy dependent position resolution |
313 | // A gaussian position distribution is assumed | |
314 | ||
b1aa729d | 315 | TVector3 newpos ; |
316 | Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ; | |
317 | Double_t x = fRan.Gaus( pos.X(), sigma ) ; | |
318 | sigma = SigmaP( energy, phi*180./TMath::Pi() ) ; | |
319 | Double_t z = fRan.Gaus( pos.Z(), sigma ) ; | |
320 | Double_t y = pos.Y() ; | |
321 | ||
322 | newpos.SetX(x) ; | |
323 | newpos.SetY(y) ; | |
324 | newpos.SetZ(z) ; | |
325 | ||
326 | return newpos ; | |
327 | } | |
a73f33f0 | 328 | |
b1aa729d | 329 | //____________________________________________________________________________ |
fc7e2f43 | 330 | void AliPHOSvFast::MakeRecParticle(Int_t modid, TVector3 pos, AliPHOSFastRecParticle & rp) |
b1aa729d | 331 | { |
b2a60966 | 332 | // Modify the primary particle properties according |
333 | // 1. the response function of PHOS | |
334 | // 2. the performance of the EMC+PPSD setup | |
335 | ||
b1aa729d | 336 | Int_t type = MakeType( rp ) ; |
a73f33f0 | 337 | rp.SetType(type) ; |
338 | ||
339 | ||
340 | // get the detected energy | |
341 | ||
342 | TLorentzVector momentum ; | |
343 | rp.Momentum(momentum) ; | |
344 | Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ; | |
345 | Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ; | |
b1aa729d | 346 | Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2) |
347 | + TMath::Power( rp.GetMass(), 2) ) ; | |
348 | ||
349 | // get the angle of incidence | |
350 | ||
351 | Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ; | |
fa7cce36 | 352 | Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ; |
b1aa729d | 353 | |
354 | // get the detected direction | |
355 | ||
356 | TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ; | |
357 | modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ; | |
358 | ||
359 | // Set the modified 4-momentum of the reconstructed particle | |
360 | ||
361 | rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ; | |
362 | ||
a73f33f0 | 363 | } |
364 | ||
365 | //____________________________________________________________________________ | |
b1aa729d | 366 | Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp ) |
a73f33f0 | 367 | { |
b2a60966 | 368 | // Generate a particle type using the performance of the EMC+PPSD setup |
369 | ||
9ec91567 | 370 | Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ; |
b1aa729d | 371 | Int_t charge = (Int_t)rp.GetPDG()->Charge() ; |
372 | Int_t test ; | |
373 | Float_t ran ; | |
f96d3dc7 | 374 | if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) ) |
b1aa729d | 375 | test = - 1 ; |
376 | else | |
377 | test = rp.GetPdgCode() ; | |
378 | ||
a4765fe4 | 379 | Fatal("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ; |
380 | // NB: ALL VALUES SHOULD BE CHECKED !!!! | |
b1aa729d | 381 | switch (test) { |
382 | ||
3a4295ee | 383 | case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!! |
b1aa729d | 384 | ran = fRan.Rndm() ; |
3a4295ee | 385 | if( ran <= 0.9498 ) |
386 | rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ; | |
387 | else | |
388 | rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ; | |
b1aa729d | 389 | break ; |
390 | ||
391 | case 2112: // it's a neutron | |
392 | ran = fRan.Rndm() ; | |
393 | if ( ran <= 0.9998 ) | |
3a4295ee | 394 | rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ; |
b1aa729d | 395 | else |
3a4295ee | 396 | rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; |
b1aa729d | 397 | break ; |
3a4295ee | 398 | |
b1aa729d | 399 | case -2112: // it's a anti-neutron |
400 | ran = fRan.Rndm() ; | |
401 | if ( ran <= 0.9984 ) | |
3a4295ee | 402 | rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ; |
b1aa729d | 403 | else |
3a4295ee | 404 | rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; |
b1aa729d | 405 | break ; |
406 | ||
407 | case 11: // it's a electron | |
408 | ran = fRan.Rndm() ; | |
409 | if ( ran <= 0.9996 ) | |
3a4295ee | 410 | rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ; |
b1aa729d | 411 | else |
3a4295ee | 412 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 413 | break; |
414 | ||
f96d3dc7 | 415 | case -11: // it's a positon |
b1aa729d | 416 | ran = fRan.Rndm() ; |
417 | if ( ran <= 0.9996 ) | |
3a4295ee | 418 | rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ; |
b1aa729d | 419 | else |
3a4295ee | 420 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 421 | break; |
422 | ||
423 | case -1: // it's a charged | |
424 | ran = fRan.Rndm() ; | |
425 | if ( ran <= 0.9996 ) | |
3a4295ee | 426 | rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ; |
b1aa729d | 427 | else |
3a4295ee | 428 | rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ; |
b1aa729d | 429 | |
430 | break ; | |
431 | } | |
432 | ||
433 | ||
a73f33f0 | 434 | return rv ; |
435 | } | |
436 | ||
f96d3dc7 | 437 | //___________________________________________________________________________ |
438 | void AliPHOSvFast::ResetPoints() | |
439 | { | |
b2a60966 | 440 | // This overloads the method in AliDetector |
441 | ||
f96d3dc7 | 442 | ResetFastRecParticles() ; |
443 | } | |
444 | ||
445 | //___________________________________________________________________________ | |
446 | void AliPHOSvFast::ResetFastRecParticles() | |
447 | { | |
b2a60966 | 448 | // Resets the list of virtual reconstructed particles |
449 | ||
f96d3dc7 | 450 | if (fFastRecParticles) |
451 | fFastRecParticles->Clear() ; | |
452 | fNRecParticles = 0 ; | |
453 | } | |
454 | ||
3decf5cb | 455 | //___________________________________________________________________________ |
456 | void AliPHOSvFast::SetBigBox(Int_t index, Float_t value) | |
457 | { | |
b2a60966 | 458 | // Set the size of the Box describing a PHOS module |
459 | ||
3decf5cb | 460 | switch (index) { |
461 | case 0: | |
462 | fBigBoxX = value ; | |
463 | break ; | |
464 | case 1: | |
465 | fBigBoxY = value ; | |
466 | break ; | |
467 | case 2: | |
468 | fBigBoxZ = value ; | |
469 | break ; | |
470 | } | |
471 | ||
472 | } | |
473 | ||
a73f33f0 | 474 | //____________________________________________________________________________ |
475 | Double_t AliPHOSvFast::SigmaE(Double_t energy) | |
476 | { | |
b2a60966 | 477 | // Calculates the energy dependent energy resolution |
478 | ||
a73f33f0 | 479 | Double_t rv = -1 ; |
480 | ||
481 | rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2) | |
482 | + TMath::Power(fResPara2/TMath::Sqrt(energy), 2) | |
483 | + TMath::Power(fResPara3, 2) ) ; | |
484 | ||
485 | return rv * energy ; | |
486 | } | |
487 | ||
b1aa729d | 488 | //____________________________________________________________________________ |
7a9d98f9 | 489 | Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence) |
b1aa729d | 490 | { |
b2a60966 | 491 | // Calculates the energy dependent position resolution |
492 | ||
b1aa729d | 493 | Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ; |
494 | Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ; | |
495 | ||
496 | return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm | |
497 | } | |
498 | ||
3decf5cb | 499 | //____________________________________________________________________________ |
500 | void AliPHOSvFast::StepManager(void) | |
501 | { | |
b2a60966 | 502 | // Only verifies if the particle reaches PHOS and stops the tracking |
3a4295ee | 503 | |
a73f33f0 | 504 | TLorentzVector lv ; |
505 | gMC->TrackPosition(lv) ; | |
b1aa729d | 506 | TVector3 pos = lv.Vect() ; |
507 | Int_t modid ; | |
508 | gMC->CurrentVolID(modid); | |
a73f33f0 | 509 | |
3a4295ee | 510 | Float_t energy = gMC->Etot() ; //Total energy of current track |
3decf5cb | 511 | |
3a4295ee | 512 | //Calculating mass of current particle |
513 | TDatabasePDG * pdg = TDatabasePDG::Instance() ; | |
514 | TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ; | |
515 | Float_t mass = partPDG->Mass() ; | |
a73f33f0 | 516 | |
3a4295ee | 517 | if(energy > mass){ |
518 | pos.SetMag(TMath::Sqrt(energy*energy-mass*mass)) ; | |
519 | TLorentzVector pTrack(pos, energy) ; | |
a73f33f0 | 520 | |
3a4295ee | 521 | TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ; |
522 | ||
523 | AliPHOSFastRecParticle rp(*part) ; | |
b1aa729d | 524 | |
3a4295ee | 525 | // Adds the response of PHOS to the particle |
526 | MakeRecParticle(modid, pos, rp) ; | |
527 | ||
528 | // add the `track' particle to the FastRecParticles list | |
b1aa729d | 529 | |
3a4295ee | 530 | AddRecParticle(rp) ; |
a73f33f0 | 531 | |
3a4295ee | 532 | part->Delete() ; |
533 | } | |
a73f33f0 | 534 | // stop the track as soon PHOS is reached |
b1aa729d | 535 | |
3decf5cb | 536 | gMC->StopTrack() ; |
537 | ||
538 | } | |
539 |