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[u/mrichter/AliRoot.git] / PHOS / AliPHOSPIDv1.cxx
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6ad0bfa0 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
6ad0bfa0 18//_________________________________________________________________________
b2a60966 19// Implementation version v1 of the PHOS particle identifier
7acf6008 20// Particle identification based on the
148b2bba 21// - RCPV: distance from CPV recpoint to EMCA recpoint.
22// - TOF
23// - PCA: Principal Components Analysis..
24// The identified particle has an identification number corresponding
25// to a 9 bits number:
bc0c084c 26// -Bit 0 to 2: bit set if RCPV > CpvEmcDistance (each bit corresponds
148b2bba 27// to a different efficiency-purity point of the photon identification)
bc0c084c 28// -Bit 3 to 5: bit set if TOF < TimeGate (each bit corresponds
148b2bba 29// to a different efficiency-purity point of the photon identification)
30// -Bit 6 to 9: bit set if Principal Components are
50739f15 31// inside an ellipse defined by the parameters a, b, c, x0 and y0.
148b2bba 32// (each bit corresponds to a different efficiency-purity point of the
50739f15 33// photon identification)
34// The PCA (Principal components analysis) needs a file that contains
35// a previous analysis of the correlations between the particles. This
bc0c084c 36// file is $ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root. Analysis done for
50739f15 37// energies between 0.5 and 100 GeV.
9fa5f1d0 38// A calibrated energy is calculated. The energy of the reconstructed
50739f15 39// cluster is corrected with the formula A + B * E + C * E^2, whose
bc0c084c 40// parameters where obtained through the study of the reconstructed
50739f15 41// energy distribution of monoenergetic photons.
a4e98857 42//
bc0c084c 43// All the parameters (RCPV(2 rows-3 columns),TOF(1r-3c),PCA(5r-4c)
50739f15 44// and calibration(1r-3c))are stored in a file called
45// $ALICE_ROOT/PHOS/Parameters.dat. Each time that AliPHOSPIDv1 is
bc0c084c 46// initialized, this parameters are copied to a Matrix (9,4), a
50739f15 47// TMatrixD object.
7acf6008 48//
a4e98857 49// use case:
50739f15 50// root [0] AliPHOSPIDv1 * p = new AliPHOSPIDv1("galice1.root")
a4e98857 51// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
50739f15 52// // reading headers from file galice1.root and create RecParticles
53 // TrackSegments and RecPoints are used
54// // set file name for the branch RecParticles
f0a4c9e9 55// root [1] p->ExecuteTask("deb all time")
50739f15 56// // available options
57// // "deb" - prints # of reconstructed particles
58// // "deb all" - prints # and list of RecParticles
59// // "time" - prints benchmarking results
7acf6008 60//
50739f15 61// root [2] AliPHOSPIDv1 * p2 = new AliPHOSPIDv1("galice1.root","v1",kTRUE)
148b2bba 62// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
50739f15 63// //Split mode.
f0a4c9e9 64// root [3] p2->ExecuteTask()
65//
50739f15 66
f0a4c9e9 67
7acf6008 68//*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH) &
148b2bba 69// Gustavo Conesa April 2002
50739f15 70// PCA redesigned by Gustavo Conesa October 2002:
71// The way of using the PCA has changed. Instead of 2
72// files with the PCA, each one with different energy ranges
73// of application, we use the wide one (0.5-100 GeV), and instead
bc0c084c 74// of fixing 3 ellipses for different ranges of energy, it has been
50739f15 75// studied the dependency of the ellipses parameters with the
76// energy, and they are implemented in the code as a funtion
77// of the energy.
78//
79//
80//
6ad0bfa0 81// --- ROOT system ---
7acf6008 82#include "TROOT.h"
83#include "TTree.h"
84#include "TFile.h"
e3817e5f 85#include "TF2.h"
86#include "TFormula.h"
87#include "TCanvas.h"
88#include "TFolder.h"
7acf6008 89#include "TSystem.h"
90#include "TBenchmark.h"
148b2bba 91#include "TMatrixD.h"
92#include "TPrincipal.h"
e3817e5f 93#include "TSystem.h"
148b2bba 94
6ad0bfa0 95// --- Standard library ---
96
75a6835b 97
6ad0bfa0 98// --- AliRoot header files ---
99
7acf6008 100#include "AliGenerator.h"
e3817e5f 101#include "AliPHOS.h"
26d4b141 102#include "AliPHOSPIDv1.h"
e3817e5f 103#include "AliPHOSClusterizerv1.h"
d956e9b7 104#include "AliPHOSEmcRecPoint.h"
6ad0bfa0 105#include "AliPHOSTrackSegment.h"
e3817e5f 106#include "AliPHOSTrackSegmentMakerv1.h"
6ad0bfa0 107#include "AliPHOSRecParticle.h"
7b7c1533 108#include "AliPHOSGeometry.h"
109#include "AliPHOSGetter.h"
6ad0bfa0 110
26d4b141 111ClassImp( AliPHOSPIDv1)
6ad0bfa0 112
6ad0bfa0 113//____________________________________________________________________________
1cb7c1ee 114AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
115{
a4e98857 116 // default ctor
148b2bba 117
8d0f3f77 118 InitParameters() ;
92f521a9 119 fDefaultInit = kTRUE ;
7acf6008 120}
121
122//____________________________________________________________________________
88cb7938 123AliPHOSPIDv1::AliPHOSPIDv1(const AliPHOSPIDv1 & pid ):AliPHOSPID(pid)
581354c5 124{
386aef34 125 // ctor
581354c5 126 InitParameters() ;
581354c5 127 Init() ;
581354c5 128
129}
130
131//____________________________________________________________________________
88cb7938 132AliPHOSPIDv1::AliPHOSPIDv1(const TString alirunFileName, const TString eventFolderName):AliPHOSPID(alirunFileName, eventFolderName)
7acf6008 133{
a4e98857 134 //ctor with the indication on where to look for the track segments
7b7c1533 135
8d0f3f77 136 InitParameters() ;
2bd5457f 137 Init() ;
92f521a9 138 fDefaultInit = kFALSE ;
7acf6008 139}
7b7c1533 140
7acf6008 141//____________________________________________________________________________
142AliPHOSPIDv1::~AliPHOSPIDv1()
143{
79bb1b62 144 // dtor
9fa5f1d0 145
e3817e5f 146 delete [] fX ; // Principal input
147 delete [] fPPhoton ; // Photon Principal components
148 delete [] fPPi0 ; // Pi0 Principal components
7acf6008 149}
148b2bba 150//____________________________________________________________________________
a496c46c 151const TString AliPHOSPIDv1::BranchName() const
152{
88cb7938 153
154 return GetName() ;
a496c46c 155}
156
157//____________________________________________________________________________
148b2bba 158void AliPHOSPIDv1::Init()
159{
160 // Make all memory allocations that are not possible in default constructor
161 // Add the PID task to the list of PHOS tasks
a496c46c 162
88cb7938 163 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data()) ;
164
165 if ( !gime->PID() )
166 gime->PostPID(this) ;
148b2bba 167}
8d0f3f77 168
169//____________________________________________________________________________
170void AliPHOSPIDv1::InitParameters()
171{
e3817e5f 172 // Initialize PID parameters
8d0f3f77 173 fRecParticlesInRun = 0 ;
8d0f3f77 174 fNEvent = 0 ;
8d0f3f77 175 fRecParticlesInRun = 0 ;
9fa5f1d0 176 SetParameters() ; // fill the parameters matrix from parameters file
eabde521 177 SetEventRange(0,-1) ;
8d0f3f77 178}
179
88cb7938 180//________________________________________________________________________
eabde521 181void AliPHOSPIDv1::Exec(Option_t *option)
88cb7938 182{
eabde521 183 // Steering method to perform particle reconstruction and identification
184 // for the event range from fFirstEvent to fLastEvent.
185 // This range is optionally set by SetEventRange().
186 // if fLastEvent=-1 (by default), then process events until the end.
61d3d6aa 187
88cb7938 188 if(strstr(option,"tim"))
189 gBenchmark->Start("PHOSPID");
190
191 if(strstr(option,"print")) {
192 Print() ;
193 return ;
194 }
195
196
fb43ada4 197 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
88cb7938 198
71cee46d 199 if (fLastEvent == -1)
200 fLastEvent = gime->MaxEvent() - 1 ;
201 else
202 fLastEvent = TMath::Min(fLastEvent,gime->MaxEvent());
eabde521 203 Int_t nEvents = fLastEvent - fFirstEvent + 1;
88cb7938 204
71cee46d 205 Int_t ievent ;
206 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
88cb7938 207 gime->Event(ievent,"TR") ;
208 if(gime->TrackSegments() && //Skip events, where no track segments made
209 gime->TrackSegments()->GetEntriesFast()) {
210 MakeRecParticles() ;
2cc71c1e 211 MakePID() ;
90cceaf6 212 WriteRecParticles();
88cb7938 213 if(strstr(option,"deb"))
214 PrintRecParticles(option) ;
215 //increment the total number of rec particles per run
216 fRecParticlesInRun += gime->RecParticles()->GetEntriesFast() ;
217 }
218 }
ff417097 219 if(strstr(option,"deb"))
220 PrintRecParticles(option);
88cb7938 221 if(strstr(option,"tim")){
222 gBenchmark->Stop("PHOSPID");
223 Info("Exec", "took %f seconds for PID %f seconds per event",
224 gBenchmark->GetCpuTime("PHOSPID"),
eabde521 225 gBenchmark->GetCpuTime("PHOSPID")/nEvents) ;
88cb7938 226 }
88cb7938 227 Unload();
228}
229
1cb7c1ee 230//____________________________________________________________________________
e3817e5f 231const TString AliPHOSPIDv1::GetFileNamePrincipal(TString particle) const
148b2bba 232{
e3817e5f 233 //Get file name that contains the PCA for a particle ("photon or pi0")
234 particle.ToLower();
235 TString name;
236 if (particle=="photon") name = fFileNamePrincipalPhoton ;
237 else if (particle=="pi0" ) name = fFileNamePrincipalPi0 ;
238 else Error("GetFileNamePrincipal","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
239 return name;
240}
bc0c084c 241
e3817e5f 242//____________________________________________________________________________
fc7e2f43 243Float_t AliPHOSPIDv1::GetParameterCalibration(Int_t i) const
e3817e5f 244{
245 // Get the i-th parameter "Calibration"
246 Float_t param = 0.;
247 if (i>2 || i<0)
248 Error("GetParameterCalibration","Invalid parameter number: %d",i);
9fa5f1d0 249 else
e3817e5f 250 param = (*fParameters)(0,i);
251 return param;
252}
bc0c084c 253
e3817e5f 254//____________________________________________________________________________
fc7e2f43 255Float_t AliPHOSPIDv1::GetCalibratedEnergy(Float_t e) const
88cb7938 256{
257// It calibrates Energy depending on the recpoint energy.
258// The energy of the reconstructed cluster is corrected with
259// the formula A + B* E + C* E^2, whose parameters where obtained
260// through the study of the reconstructed energy distribution of
261// monoenergetic photons.
262
263 Float_t p[]={0.,0.,0.};
264 for (Int_t i=0; i<3; i++) p[i] = GetParameterCalibration(i);
265 Float_t enerec = p[0] + p[1]*e + p[2]*e*e;
266 return enerec ;
267
268}
269
270//____________________________________________________________________________
fc7e2f43 271Float_t AliPHOSPIDv1::GetParameterCpv2Emc(Int_t i, TString axis) const
e3817e5f 272{
273 // Get the i-th parameter "CPV-EMC distance" for the specified axis
274 Float_t param = 0.;
275 if(i>2 || i<0)
276 Error("GetParameterCpv2Emc","Invalid parameter number: %d",i);
277 else {
278 axis.ToLower();
279 if (axis == "x") param = (*fParameters)(1,i);
280 else if (axis == "z") param = (*fParameters)(2,i);
281 else Error("GetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
282 }
283 return param;
284}
285
286//____________________________________________________________________________
fc7e2f43 287Float_t AliPHOSPIDv1::GetCpv2EmcDistanceCut(TString axis, Float_t e) const
e3817e5f 288{
88cb7938 289 // Get CpvtoEmcDistance Cut depending on the cluster energy, axis and
290 // Purity-Efficiency point
291
292 axis.ToLower();
293 Float_t p[]={0.,0.,0.};
294 for (Int_t i=0; i<3; i++) p[i] = GetParameterCpv2Emc(i,axis);
295 Float_t sig = p[0] + TMath::Exp(p[1] - p[2]*e);
296 return sig;
e3817e5f 297}
298
88cb7938 299//____________________________________________________________________________
fc7e2f43 300Float_t AliPHOSPIDv1::GetEllipseParameter(TString particle, TString param, Float_t e) const
88cb7938 301{
302 // Calculates the parameter param of the ellipse
e3817e5f 303
304 particle.ToLower();
305 param. ToLower();
88cb7938 306 Float_t p[4]={0.,0.,0.,0.};
307 Float_t value = 0.0;
308 for (Int_t i=0; i<4; i++) p[i] = GetParameterToCalculateEllipse(particle,param,i);
309 if (particle == "photon") {
310 if (param.Contains("a")) e = TMath::Min((Double_t)e,70.);
311 else if (param.Contains("b")) e = TMath::Min((Double_t)e,70.);
312 else if (param.Contains("x0")) e = TMath::Max((Double_t)e,1.1);
313 }
e3817e5f 314
88cb7938 315 value = p[0]/TMath::Sqrt(e) + p[1]*e + p[2]*e*e + p[3];
316 return value;
e3817e5f 317}
318
319//_____________________________________________________________________________
fc7e2f43 320Float_t AliPHOSPIDv1::GetParameterPhotonBoundary (Int_t i) const
e3817e5f 321{
322 // Get the parameter "i" to calculate the boundary on the moment M2x
323 // for photons at high p_T
324 Float_t param = 0;
325 if (i>3 || i<0)
326 Error("GetParameterPhotonBoundary","Wrong parameter number: %d\n",i);
327 else
328 param = (*fParameters)(14,i) ;
329 return param;
148b2bba 330}
e3817e5f 331
148b2bba 332//____________________________________________________________________________
fc7e2f43 333Float_t AliPHOSPIDv1::GetParameterPi0Boundary (Int_t i) const
e3817e5f 334{
335 // Get the parameter "i" to calculate the boundary on the moment M2x
336 // for pi0 at high p_T
337 Float_t param = 0;
338 if (i>2 || i<0)
339 Error("GetParameterPi0Boundary","Wrong parameter number: %d\n",i);
340 else
341 param = (*fParameters)(15,i) ;
342 return param;
343}
148b2bba 344
e3817e5f 345//____________________________________________________________________________
fc7e2f43 346Float_t AliPHOSPIDv1::GetParameterTimeGate(Int_t i) const
e3817e5f 347{
88cb7938 348 // Get TimeGate parameter depending on Purity-Efficiency i:
349 // i=0 - Low purity, i=1 - Medium purity, i=2 - High purity
350 Float_t param = 0.;
e3817e5f 351 if(i>2 || i<0)
88cb7938 352 Error("GetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
e3817e5f 353 else
88cb7938 354 param = (*fParameters)(3,i) ;
355 return param;
e3817e5f 356}
357
e3817e5f 358//_____________________________________________________________________________
fc7e2f43 359Float_t AliPHOSPIDv1::GetParameterToCalculateEllipse(TString particle, TString param, Int_t i) const
88cb7938 360{
361 // Get the parameter "i" that is needed to calculate the ellipse
362 // parameter "param" for the particle "particle" ("photon" or "pi0")
363
e3817e5f 364 particle.ToLower();
365 param. ToLower();
88cb7938 366 Int_t offset = -1;
e3817e5f 367 if (particle == "photon") offset=0;
368 else if (particle == "pi0") offset=5;
369 else
88cb7938 370 Error("GetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
371
372 Int_t p= -1;
373 Float_t par = 0;
e3817e5f 374
375 if (param.Contains("a")) p=4+offset;
376 else if(param.Contains("b")) p=5+offset;
377 else if(param.Contains("c")) p=6+offset;
378 else if(param.Contains("x0"))p=7+offset;
379 else if(param.Contains("y0"))p=8+offset;
12022e83 380
88cb7938 381 if (i>4 || i<0)
382 Error("GetParameterToCalculateEllipse", "No parameter with index", i) ;
383 else if (p==-1)
384 Error("GetParameterToCalculateEllipse", "No parameter with name %s", param.Data() ) ;
12022e83 385 else
88cb7938 386 par = (*fParameters)(p,i) ;
387
388 return par;
12022e83 389}
390
12022e83 391
392//____________________________________________________________________________
8d4608b5 393Float_t AliPHOSPIDv1::GetDistance(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Option_t * axis)const
69183710 394{
395 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
148b2bba 396
88cb7938 397 const AliPHOSGeometry * geom = AliPHOSGetter::Instance()->PHOSGeometry() ;
69183710 398 TVector3 vecEmc ;
7acf6008 399 TVector3 vecCpv ;
148b2bba 400 if(cpv){
401 emc->GetLocalPosition(vecEmc) ;
402 cpv->GetLocalPosition(vecCpv) ;
2bb500e5 403
148b2bba 404 if(emc->GetPHOSMod() == cpv->GetPHOSMod()){
405 // Correct to difference in CPV and EMC position due to different distance to center.
406 // we assume, that particle moves from center
407 Float_t dCPV = geom->GetIPtoOuterCoverDistance();
408 Float_t dEMC = geom->GetIPtoCrystalSurface() ;
409 dEMC = dEMC / dCPV ;
410 vecCpv = dEMC * vecCpv - vecEmc ;
e3817e5f 411 if (axis == "X") return vecCpv.X();
412 if (axis == "Y") return vecCpv.Y();
413 if (axis == "Z") return vecCpv.Z();
414 if (axis == "R") return vecCpv.Mag();
415 }
148b2bba 416 return 100000000 ;
417 }
7acf6008 418 return 100000000 ;
69183710 419}
bc0c084c 420//____________________________________________________________________________
8d4608b5 421Int_t AliPHOSPIDv1::GetCPVBit(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Int_t effPur, Float_t e) const
bc0c084c 422{
e3817e5f 423 if(effPur>2 || effPur<0)
424 Error("GetCPVBit","Invalid Efficiency-Purity choice %d",effPur);
bc0c084c 425
e3817e5f 426 Float_t sigX = GetCpv2EmcDistanceCut("X",e);
427 Float_t sigZ = GetCpv2EmcDistanceCut("Z",e);
bc0c084c 428
429 Float_t deltaX = TMath::Abs(GetDistance(emc, cpv, "X"));
430 Float_t deltaZ = TMath::Abs(GetDistance(emc, cpv, "Z"));
8d4608b5 431
e3817e5f 432 if((deltaX>sigX*(effPur+1))|(deltaZ>sigZ*(effPur+1)))
bc0c084c 433 return 1;//Neutral
434 else
435 return 0;//Charged
bc0c084c 436}
69183710 437
69183710 438//____________________________________________________________________________
fc7e2f43 439Int_t AliPHOSPIDv1::GetPrincipalBit(TString particle, const Double_t* p, Int_t effPur, Float_t e)const
148b2bba 440{
50739f15 441 //Is the particle inside de PCA ellipse?
581354c5 442
e3817e5f 443 particle.ToLower();
444 Int_t prinbit = 0 ;
445 Float_t a = GetEllipseParameter(particle,"a" , e);
446 Float_t b = GetEllipseParameter(particle,"b" , e);
447 Float_t c = GetEllipseParameter(particle,"c" , e);
448 Float_t x0 = GetEllipseParameter(particle,"x0", e);
449 Float_t y0 = GetEllipseParameter(particle,"y0", e);
450
451 Float_t r = TMath::Power((p[0] - x0)/a,2) +
452 TMath::Power((p[1] - y0)/b,2) +
453 c*(p[0] - x0)*(p[1] - y0)/(a*b) ;
50739f15 454 //3 different ellipses defined
e3817e5f 455 if((effPur==2) && (r<1./2.)) prinbit= 1;
456 if((effPur==1) && (r<2. )) prinbit= 1;
457 if((effPur==0) && (r<9./2.)) prinbit= 1;
50739f15 458
581354c5 459 if(r<0)
e3817e5f 460 Error("GetPrincipalBit", "Negative square?") ;
1f0e7ccd 461
462 return prinbit;
148b2bba 463
148b2bba 464}
1f0e7ccd 465//____________________________________________________________________________
fc7e2f43 466Int_t AliPHOSPIDv1::GetHardPhotonBit(AliPHOSEmcRecPoint * emc) const
1f0e7ccd 467{
e3817e5f 468 // Set bit for identified hard photons (E > 30 GeV)
469 // if the second moment M2x is below the boundary
470
471 Float_t e = emc->GetEnergy();
472 if (e < 30.0) return 0;
473 Float_t m2x = emc->GetM2x();
474 Float_t m2xBoundary = GetParameterPhotonBoundary(0) *
475 TMath::Exp(-TMath::Power(e-GetParameterPhotonBoundary(1),2)/2.0/
476 TMath::Power(GetParameterPhotonBoundary(2),2)) +
477 GetParameterPhotonBoundary(3);
61d3d6aa 478 //Info("GetHardPhotonBit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
e3817e5f 479 if (m2x < m2xBoundary)
480 return 1;// A hard photon
481 else
482 return 0;// Not a hard photon
1f0e7ccd 483}
92f521a9 484
e3817e5f 485//____________________________________________________________________________
fc7e2f43 486Int_t AliPHOSPIDv1::GetHardPi0Bit(AliPHOSEmcRecPoint * emc) const
e3817e5f 487{
488 // Set bit for identified hard pi0 (E > 30 GeV)
489 // if the second moment M2x is above the boundary
490
491 Float_t e = emc->GetEnergy();
492 if (e < 30.0) return 0;
493 Float_t m2x = emc->GetM2x();
494 Float_t m2xBoundary = GetParameterPi0Boundary(0) +
495 e * GetParameterPi0Boundary(1);
61d3d6aa 496 //Info("GetHardPi0Bit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
e3817e5f 497 if (m2x > m2xBoundary)
498 return 1;// A hard pi0
bc0c084c 499 else
e3817e5f 500 return 0;// Not a hard pi0
f0a4c9e9 501}
e3817e5f 502
503//____________________________________________________________________________
8d4608b5 504TVector3 AliPHOSPIDv1::GetMomentumDirection(AliPHOSEmcRecPoint * emc, AliPHOSCpvRecPoint * )const
88cb7938 505{
506 // Calculates the momentum direction:
507 // 1. if only a EMC RecPoint, direction is given by IP and this RecPoint
508 // 2. if a EMC RecPoint and CPV RecPoint, direction is given by the line through the 2 recpoints
509 // However because of the poor position resolution of PPSD the direction is always taken as if we were
510 // in case 1.
f0a4c9e9 511
88cb7938 512 TVector3 dir(0,0,0) ;
9688c1dd 513
88cb7938 514 TVector3 emcglobalpos ;
515 TMatrix dummy ;
bf8f1fbd 516
88cb7938 517 emc->GetGlobalPosition(emcglobalpos, dummy) ;
bf8f1fbd 518
e3817e5f 519
88cb7938 520 dir = emcglobalpos ;
88cb7938 521 dir.SetMag(1.) ;
e3817e5f 522
88cb7938 523 //account correction to the position of IP
524 Float_t xo,yo,zo ; //Coordinates of the origin
525 gAlice->Generator()->GetOrigin(xo,yo,zo) ;
526 TVector3 origin(xo,yo,zo);
527 dir = dir - origin ;
e3817e5f 528
88cb7938 529 return dir ;
7acf6008 530}
7b7c1533 531
532//____________________________________________________________________________
2cc71c1e 533void AliPHOSPIDv1::MakePID()
534{
535 // construct the PID weight from a Bayesian Method
536
537 Int_t index ;
538 Float_t pid1, pid2, pid3, pid4, pid5, pid6 ;
539 pid1 = pid2 = pid3 = pid4 = pid5 = pid6 = 0 ;
540 Int_t nparticles = AliPHOSGetter::Instance()->RecParticles()->GetEntriesFast() ;
541 for(index = 0 ; index < nparticles ; index ++) {
542 AliPHOSRecParticle * recpar = AliPHOSGetter::Instance()->RecParticle(index) ;
543 if (recpar->IsPhoton() || recpar->IsHardPhoton()) pid1++ ;
544 else if (recpar->IsPi0() || recpar->IsHardPi0()) pid2++ ;
545 else if (recpar->IsElectron()) pid3++ ;
546 else if (recpar->IsChargedHadron()) pid4++ ;
547 else if (recpar->IsNeutralHadron()) pid5++ ;
548 else if (recpar->IsEleCon()) pid6++ ;
549 }
550}
551
552//____________________________________________________________________________
e3817e5f 553void AliPHOSPIDv1::MakeRecParticles()
554{
b2a60966 555 // Makes a RecParticle out of a TrackSegment
148b2bba 556
88cb7938 557 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
fbf811ec 558 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
559 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
560 TClonesArray * trackSegments = gime->TrackSegments() ;
148b2bba 561 if ( !emcRecPoints || !cpvRecPoints || !trackSegments ) {
f1611b7c 562 Fatal("MakeRecParticles", "RecPoints or TrackSegments not found !") ;
148b2bba 563 }
fbf811ec 564 TClonesArray * recParticles = gime->RecParticles() ;
01a599c9 565 recParticles->Clear();
148b2bba 566
7b7c1533 567 TIter next(trackSegments) ;
7acf6008 568 AliPHOSTrackSegment * ts ;
6ad0bfa0 569 Int_t index = 0 ;
09fc14a0 570 AliPHOSRecParticle * rp ;
7acf6008 571 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
fad3e5b9 572
7b7c1533 573 new( (*recParticles)[index] ) AliPHOSRecParticle() ;
574 rp = (AliPHOSRecParticle *)recParticles->At(index) ;
f0a4c9e9 575 rp->SetTrackSegment(index) ;
9688c1dd 576 rp->SetIndexInList(index) ;
148b2bba 577
7acf6008 578 AliPHOSEmcRecPoint * emc = 0 ;
579 if(ts->GetEmcIndex()>=0)
7b7c1533 580 emc = (AliPHOSEmcRecPoint *) emcRecPoints->At(ts->GetEmcIndex()) ;
fad3e5b9 581
8d4608b5 582 AliPHOSCpvRecPoint * cpv = 0 ;
7acf6008 583 if(ts->GetCpvIndex()>=0)
8d4608b5 584 cpv = (AliPHOSCpvRecPoint *) cpvRecPoints->At(ts->GetCpvIndex()) ;
fad3e5b9 585
bd76890a 586 Int_t track = 0 ;
587 track = ts->GetTrackIndex() ;
588
148b2bba 589 // Now set type (reconstructed) of the particle
590
591 // Choose the cluster energy range
9fa5f1d0 592
fbf811ec 593 if (!emc) {
f1611b7c 594 Fatal("MakeRecParticles", "-> emc(%d) = %d", ts->GetEmcIndex(), emc ) ;
fbf811ec 595 }
50739f15 596
e3817e5f 597 Float_t e = emc->GetEnergy() ;
bc0c084c 598
6f969528 599 Float_t lambda[2] ;
600 emc->GetElipsAxis(lambda) ;
50739f15 601
602 if((lambda[0]>0.01) && (lambda[1]>0.01)){
603 // Looking PCA. Define and calculate the data (X),
bc0c084c 604 // introduce in the function X2P that gives the components (P).
605
e3817e5f 606 Float_t Spher = 0. ;
607 Float_t Emaxdtotal = 0. ;
50739f15 608
bc0c084c 609 if((lambda[0]+lambda[1])!=0)
e3817e5f 610 Spher=fabs(lambda[0]-lambda[1])/(lambda[0]+lambda[1]);
50739f15 611
e3817e5f 612 Emaxdtotal=emc->GetMaximalEnergy()/emc->GetEnergy();
50739f15 613
614 fX[0] = lambda[0] ;
615 fX[1] = lambda[1] ;
616 fX[2] = emc->GetDispersion() ;
e3817e5f 617 fX[3] = Spher ;
50739f15 618 fX[4] = emc->GetMultiplicity() ;
e3817e5f 619 fX[5] = Emaxdtotal ;
50739f15 620 fX[6] = emc->GetCoreEnergy() ;
621
e3817e5f 622 fPrincipalPhoton->X2P(fX,fPPhoton);
623 fPrincipalPi0 ->X2P(fX,fPPi0);
1f0e7ccd 624
50739f15 625 }
626 else{
e3817e5f 627 fPPhoton[0]=-100.0; //We do not accept clusters with
628 fPPhoton[1]=-100.0; //one cell as a photon-like
629 fPPi0[0] =-100.0;
630 fPPi0[1] =-100.0;
50739f15 631 }
632
2cc71c1e 633 Float_t time = emc->GetTime() ;
634 rp->SetTof(time) ;
9fa5f1d0 635
bc0c084c 636 // Loop of Efficiency-Purity (the 3 points of purity or efficiency
637 // are taken into account to set the particle identification)
e3817e5f 638 for(Int_t effPur = 0; effPur < 3 ; effPur++){
50739f15 639
bc0c084c 640 // Looking at the CPV detector. If RCPV greater than CpvEmcDistance,
641 // 1st,2nd or 3rd bit (depending on the efficiency-purity point )
642 // is set to 1
e3817e5f 643 if(GetCPVBit(emc, cpv, effPur,e) == 1 )
644 rp->SetPIDBit(effPur) ;
f0a4c9e9 645
50739f15 646 // Looking the TOF. If TOF smaller than gate, 4th, 5th or 6th
647 // bit (depending on the efficiency-purity point )is set to 1
2cc71c1e 648 if(time< (*fParameters)(3,effPur))
e3817e5f 649 rp->SetPIDBit(effPur+3) ;
2cc71c1e 650
e3817e5f 651 //Photon PCA
50739f15 652 //If we are inside the ellipse, 7th, 8th or 9th
653 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 654 if(GetPrincipalBit("photon",fPPhoton,effPur,e) == 1)
655 rp->SetPIDBit(effPur+6) ;
1f0e7ccd 656
e3817e5f 657 //Pi0 PCA
1f0e7ccd 658 //If we are inside the ellipse, 10th, 11th or 12th
659 // bit (depending on the efficiency-purity point )is set to 1
e3817e5f 660 if(GetPrincipalBit("pi0" ,fPPi0 ,effPur,e) == 1)
661 rp->SetPIDBit(effPur+9) ;
f0a4c9e9 662 }
e3817e5f 663 if(GetHardPhotonBit(emc))
664 rp->SetPIDBit(12) ;
665 if(GetHardPi0Bit (emc))
666 rp->SetPIDBit(13) ;
1f0e7ccd 667
bd76890a 668 if(track >= 0)
669 rp->SetPIDBit(14) ;
670
9fa5f1d0 671 //Set momentum, energy and other parameters
50739f15 672 Float_t encal = GetCalibratedEnergy(e);
9fa5f1d0 673 TVector3 dir = GetMomentumDirection(emc,cpv) ;
674 dir.SetMag(encal) ;
675 rp->SetMomentum(dir.X(),dir.Y(),dir.Z(),encal) ;
676 rp->SetCalcMass(0);
e0ed2e49 677 rp->Name(); //If photon sets the particle pdg name to gamma
e747b8da 678 rp->SetProductionVertex(0,0,0,0);
679 rp->SetFirstMother(-1);
680 rp->SetLastMother(-1);
681 rp->SetFirstDaughter(-1);
682 rp->SetLastDaughter(-1);
683 rp->SetPolarisation(0,0,0);
d956e9b7 684 //Set the position in global coordinate system from the RecPoint
685 AliPHOSGeometry * geom = gime->PHOSGeometry() ;
686 AliPHOSTrackSegment * ts = gime->TrackSegment(rp->GetPHOSTSIndex()) ;
687 AliPHOSEmcRecPoint * erp = gime->EmcRecPoint(ts->GetEmcIndex()) ;
688 TVector3 pos ;
689 geom->GetGlobal(erp, pos) ;
690 rp->SetPos(pos);
6ad0bfa0 691 index++ ;
692 }
6ad0bfa0 693}
e3817e5f 694
09fc14a0 695//____________________________________________________________________________
88cb7938 696void AliPHOSPIDv1::Print() const
09fc14a0 697{
b2a60966 698 // Print the parameters used for the particle type identification
bc0c084c 699
88cb7938 700 Info("Print", "=============== AliPHOSPIDv1 ================") ;
701 printf("Making PID\n") ;
702 printf(" Pricipal analysis file from 0.5 to 100 %s\n", fFileNamePrincipalPhoton.Data() ) ;
703 printf(" Name of parameters file %s\n", fFileNameParameters.Data() ) ;
704 printf(" Matrix of Parameters: 14x4\n") ;
705 printf(" Energy Calibration 1x3 [3 parametres to calibrate energy: A + B* E + C * E^2]\n") ;
706 printf(" RCPV 2x3 rows x and z, columns function cut parameters\n") ;
707 printf(" TOF 1x3 [High Eff-Low Pur,Medium Eff-Pur, Low Eff-High Pur]\n") ;
708 printf(" PCA 5x4 [5 ellipse parametres and 4 parametres to calculate them: A/Sqrt(E) + B* E + C * E^2 + D]\n") ;
709 Printf(" Pi0 PCA 5x3 [5 ellipse parametres and 3 parametres to calculate them: A + B* E + C * E^2]\n") ;
50739f15 710 fParameters->Print() ;
09fc14a0 711}
712
8d0f3f77 713
69183710 714
7acf6008 715//____________________________________________________________________________
a4e98857 716void AliPHOSPIDv1::PrintRecParticles(Option_t * option)
717{
dd5c4038 718 // Print table of reconstructed particles
719
88cb7938 720 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
bf8f1fbd 721
88cb7938 722 TClonesArray * recParticles = gime->RecParticles() ;
21cd0c07 723
724 TString message ;
3bf72d32 725 message = "\nevent " ;
726 message += gAlice->GetEvNumber() ;
727 message += " found " ;
728 message += recParticles->GetEntriesFast();
729 message += " RecParticles\n" ;
730
7acf6008 731 if(strstr(option,"all")) { // printing found TS
3bf72d32 732 message += "\n PARTICLE Index \n" ;
7acf6008 733
734 Int_t index ;
7b7c1533 735 for (index = 0 ; index < recParticles->GetEntries() ; index++) {
21cd0c07 736 AliPHOSRecParticle * rp = (AliPHOSRecParticle * ) recParticles->At(index) ;
3bf72d32 737 message += "\n" ;
738 message += rp->Name().Data() ;
739 message += " " ;
740 message += rp->GetIndexInList() ;
741 message += " " ;
742 message += rp->GetType() ;
7acf6008 743 }
3bf72d32 744 }
745 Info("Print", message.Data() ) ;
69183710 746}
88cb7938 747
748//____________________________________________________________________________
749void AliPHOSPIDv1::SetParameters()
750{
751 // PCA : To do the Principal Components Analysis it is necessary
752 // the Principal file, which is opened here
753 fX = new double[7]; // Data for the PCA
754 fPPhoton = new double[7]; // Eigenvalues of the PCA
755 fPPi0 = new double[7]; // Eigenvalues of the Pi0 PCA
756
757 // Read photon principals from the photon file
758
759 fFileNamePrincipalPhoton = "$ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root" ;
760 TFile f( fFileNamePrincipalPhoton.Data(), "read" ) ;
761 fPrincipalPhoton = dynamic_cast<TPrincipal*> (f.Get("principal")) ;
762 f.Close() ;
763
764 // Read pi0 principals from the pi0 file
765
766 fFileNamePrincipalPi0 = "$ALICE_ROOT/PHOS/PCA_pi0_40-120.root" ;
767 TFile fPi0( fFileNamePrincipalPi0.Data(), "read" ) ;
768 fPrincipalPi0 = dynamic_cast<TPrincipal*> (fPi0.Get("principal")) ;
769 fPi0.Close() ;
770
771 // Open parameters file and initialization of the Parameters matrix.
772 // In the File Parameters.dat are all the parameters. These are introduced
773 // in a matrix of 16x4
774 //
775 // All the parameters defined in this file are, in order of row:
776 // line 0 : calibration
777 // lines 1,2 : CPV rectangular cat for X and Z
778 // line 3 : TOF cut
779 // lines 4-8 : parameters to calculate photon PCA ellipse
780 // lines 9-13: parameters to calculate pi0 PCA ellipse
781 // lines 14-15: parameters to calculate border for high-pt photons and pi0
782
783 fFileNameParameters = gSystem->ExpandPathName("$ALICE_ROOT/PHOS/Parameters.dat");
784 fParameters = new TMatrix(16,4) ;
785 const Int_t maxLeng=255;
786 char string[maxLeng];
787
788 // Open a text file with PID parameters
789 FILE *fd = fopen(fFileNameParameters.Data(),"r");
790 if (!fd)
791 Fatal("SetParameter","File %s with a PID parameters cannot be opened\n",
792 fFileNameParameters.Data());
793
794 Int_t i=0;
795 // Read parameter file line-by-line and skip empty line and comments
796 while (fgets(string,maxLeng,fd) != NULL) {
797 if (string[0] == '\n' ) continue;
798 if (string[0] == '!' ) continue;
799 sscanf(string, "%f %f %f %f",
800 &(*fParameters)(i,0), &(*fParameters)(i,1),
801 &(*fParameters)(i,2), &(*fParameters)(i,3));
802 i++;
2cc71c1e 803 //Info("SetParameters", "line %d: %s",i,string);
88cb7938 804 }
805 fclose(fd);
806}
807
808//____________________________________________________________________________
809void AliPHOSPIDv1::SetParameterCalibration(Int_t i,Float_t param)
810{
811 // Set parameter "Calibration" i to a value param
812 if(i>2 || i<0)
813 Error("SetParameterCalibration","Invalid parameter number: %d",i);
814 else
815 (*fParameters)(0,i) = param ;
816}
817
818//____________________________________________________________________________
819void AliPHOSPIDv1::SetParameterCpv2Emc(Int_t i, TString axis, Float_t cut)
820{
821 // Set the parameters to calculate Cpv-to-Emc Distance Cut depending on
822 // Purity-Efficiency point i
823
824 if(i>2 || i<0)
825 Error("SetParameterCpv2Emc","Invalid parameter number: %d",i);
826 else {
827 axis.ToLower();
828 if (axis == "x") (*fParameters)(1,i) = cut;
829 else if (axis == "z") (*fParameters)(2,i) = cut;
830 else Error("SetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
831 }
832}
833
834//____________________________________________________________________________
835void AliPHOSPIDv1::SetParameterPhotonBoundary(Int_t i,Float_t param)
836{
837 // Set parameter "Hard photon boundary" i to a value param
838 if(i>4 || i<0)
839 Error("SetParameterPhotonBoundary","Invalid parameter number: %d",i);
840 else
841 (*fParameters)(14,i) = param ;
842}
843
844//____________________________________________________________________________
845void AliPHOSPIDv1::SetParameterPi0Boundary(Int_t i,Float_t param)
846{
847 // Set parameter "Hard pi0 boundary" i to a value param
848 if(i>1 || i<0)
849 Error("SetParameterPi0Boundary","Invalid parameter number: %d",i);
850 else
851 (*fParameters)(15,i) = param ;
852}
853
854//_____________________________________________________________________________
855void AliPHOSPIDv1::SetParameterTimeGate(Int_t i, Float_t gate)
856{
857 // Set the parameter TimeGate depending on Purity-Efficiency point i
858 if (i>2 || i<0)
859 Error("SetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
860 else
861 (*fParameters)(3,i)= gate ;
862}
863
864//_____________________________________________________________________________
865void AliPHOSPIDv1::SetParameterToCalculateEllipse(TString particle, TString param, Int_t i, Float_t par)
866{
867 // Set the parameter "i" that is needed to calculate the ellipse
868 // parameter "param" for a particle "particle"
869
870 particle.ToLower();
871 param. ToLower();
872 Int_t p= -1;
873 Int_t offset=0;
874
875 if (particle == "photon") offset=0;
876 else if (particle == "pi0") offset=5;
877 else
878 Error("SetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
879
880 if (param.Contains("a")) p=4+offset;
881 else if(param.Contains("b")) p=5+offset;
882 else if(param.Contains("c")) p=6+offset;
883 else if(param.Contains("x0"))p=7+offset;
884 else if(param.Contains("y0"))p=8+offset;
885 if((i>4)||(i<0))
886 Error("SetEllipseParameter", "No parameter with index %d", i) ;
887 else if(p==-1)
888 Error("SetEllipseParameter", "No parameter with name %s", param.Data() ) ;
889 else
890 (*fParameters)(p,i) = par ;
891}
892
893//____________________________________________________________________________
894void AliPHOSPIDv1::Unload()
895{
896 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
897 gime->PhosLoader()->UnloadRecPoints() ;
898 gime->PhosLoader()->UnloadTracks() ;
899 gime->PhosLoader()->UnloadRecParticles() ;
900}
901
902//____________________________________________________________________________
90cceaf6 903void AliPHOSPIDv1::WriteRecParticles()
88cb7938 904{
905
906 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
907
908 TClonesArray * recParticles = gime->RecParticles() ;
909 recParticles->Expand(recParticles->GetEntriesFast() ) ;
910 TTree * treeP = gime->TreeP();
911
912 //First rp
913 Int_t bufferSize = 32000 ;
914 TBranch * rpBranch = treeP->Branch("PHOSRP",&recParticles,bufferSize);
915 rpBranch->SetTitle(BranchName());
916
917 rpBranch->Fill() ;
918
919 gime->WriteRecParticles("OVERWRITE");
920 gime->WritePID("OVERWRITE");
921}
922