1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 *
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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 **************************************************************************/
18 //_________________________________________________________________________
19 // Implementation version v1 of the PHOS particle identifier
20 // Particle identification based on the
21 // - RCPV: distance from CPV recpoint to EMCA recpoint.
23 // - PCA: Principal Components Analysis..
24 // The identified particle has an identification number corresponding
25 // to a 9 bits number:
26 // -Bit 0 to 2: bit set if RCPV > CpvEmcDistance (each bit corresponds
27 // to a different efficiency-purity point of the photon identification)
28 // -Bit 3 to 5: bit set if TOF < TimeGate (each bit corresponds
29 // to a different efficiency-purity point of the photon identification)
30 // -Bit 6 to 9: bit set if Principal Components are
31 // inside an ellipse defined by the parameters a, b, c, x0 and y0.
32 // (each bit corresponds to a different efficiency-purity point of the
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
36 // file is $ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root. Analysis done for
37 // energies between 0.5 and 100 GeV.
38 // A calibrated energy is calculated. The energy of the reconstructed
39 // cluster is corrected with the formula A + B * E + C * E^2, whose
40 // parameters where obtained through the study of the reconstructed
41 // energy distribution of monoenergetic photons.
43 // All the parameters (RCPV(2 rows-3 columns),TOF(1r-3c),PCA(5r-4c)
44 // and calibration(1r-3c))are stored in a file called
45 // $ALICE_ROOT/PHOS/Parameters.dat. Each time that AliPHOSPIDv1 is
46 // initialized, this parameters are copied to a Matrix (9,4), a
50 // root [0] AliPHOSPIDv1 * p = new AliPHOSPIDv1("galice1.root")
51 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
52 // // reading headers from file galice1.root and create RecParticles
53 // TrackSegments and RecPoints are used
54 // // set file name for the branch RecParticles
55 // root [1] p->ExecuteTask("deb all time")
56 // // available options
57 // // "deb" - prints # of reconstructed particles
58 // // "deb all" - prints # and list of RecParticles
59 // // "time" - prints benchmarking results
61 // root [2] AliPHOSPIDv1 * p2 = new AliPHOSPIDv1("galice1.root","v1",kTRUE)
62 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
64 // root [3] p2->ExecuteTask()
68 //*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH) &
69 // Gustavo Conesa April 2002
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
74 // of fixing 3 ellipses for different ranges of energy, it has been
75 // studied the dependency of the ellipses parameters with the
76 // energy, and they are implemented in the code as a funtion
81 // --- ROOT system ---
90 #include "TBenchmark.h"
92 #include "TPrincipal.h"
95 // --- Standard library ---
98 // --- AliRoot header files ---
100 #include "AliGenerator.h"
102 #include "AliPHOSPIDv1.h"
103 #include "AliPHOSClusterizerv1.h"
104 #include "AliPHOSEmcRecPoint.h"
105 #include "AliPHOSTrackSegment.h"
106 #include "AliPHOSTrackSegmentMakerv1.h"
107 #include "AliPHOSRecParticle.h"
108 #include "AliPHOSGeometry.h"
109 #include "AliPHOSGetter.h"
111 ClassImp( AliPHOSPIDv1)
113 //____________________________________________________________________________
114 AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
119 fDefaultInit = kTRUE ;
122 //____________________________________________________________________________
123 AliPHOSPIDv1::AliPHOSPIDv1(const AliPHOSPIDv1 & pid ):AliPHOSPID(pid)
131 //____________________________________________________________________________
132 AliPHOSPIDv1::AliPHOSPIDv1(const TString alirunFileName, const TString eventFolderName):AliPHOSPID(alirunFileName, eventFolderName)
134 //ctor with the indication on where to look for the track segments
138 fDefaultInit = kFALSE ;
141 //____________________________________________________________________________
142 AliPHOSPIDv1::~AliPHOSPIDv1()
146 delete [] fX ; // Principal input
147 delete [] fPPhoton ; // Photon Principal components
148 delete [] fPPi0 ; // Pi0 Principal components
150 //____________________________________________________________________________
151 const TString AliPHOSPIDv1::BranchName() const
157 //____________________________________________________________________________
158 void AliPHOSPIDv1::Init()
160 // Make all memory allocations that are not possible in default constructor
161 // Add the PID task to the list of PHOS tasks
163 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data()) ;
166 gime->PostPID(this) ;
169 //____________________________________________________________________________
170 void AliPHOSPIDv1::InitParameters()
172 // Initialize PID parameters
173 fRecParticlesInRun = 0 ;
175 fRecParticlesInRun = 0 ;
176 SetParameters() ; // fill the parameters matrix from parameters file
177 SetEventRange(0,-1) ;
178 // initialisation of response function parameters
181 fTphoton[0] = 2.97E-1 ;
182 fTphoton[1] = 1.55E-8 ;
183 fTphoton[2] = 5.40E-10 ;
184 fTFphoton = new TFormula("ToF response to photon" , "gaus") ;
185 fTFphoton->SetParameters( fTphoton[0], fTphoton[1], fTphoton[2]) ;
187 fTelectron[0] = 2.73E-1 ;
188 fTelectron[1] = 1.56E-8 ;
189 fTelectron[2] = 5.70E-10 ;
190 fTFelectron = new TFormula("ToF response to electron" , "gaus") ;
191 fTFelectron->SetParameters( fTelectron[0], fTelectron[1], fTelectron[2]) ;
193 fTchargedhadron[0] = 1.58E-1 ;
194 fTchargedhadron[1] = 1.64E-8 ;
195 fTchargedhadron[2] = 3.59E-10 ;
196 fTFchargedhadron = new TFormula("ToF response to charged hadron" , "landau") ;
197 fTFchargedhadron->SetParameters( fTchargedhadron[0], fTchargedhadron[1], fTchargedhadron[2]) ;
199 fTneutralhadron[0] = 9.62E-1 ;
200 fTneutralhadron[1] = 1.65E-8 ;
201 fTneutralhadron[2] = 6.46E-10 ;
202 fTFneutralhadron = new TFormula("ToF response to neutral hadron" , "landau") ;
203 fTFneutralhadron->SetParameters( fTneutralhadron[0], fTneutralhadron[1], fTneutralhadron[2]) ;
206 //________________________________________________________________________
207 void AliPHOSPIDv1::Exec(Option_t *option)
209 // Steering method to perform particle reconstruction and identification
210 // for the event range from fFirstEvent to fLastEvent.
211 // This range is optionally set by SetEventRange().
212 // if fLastEvent=-1 (by default), then process events until the end.
214 if(strstr(option,"tim"))
215 gBenchmark->Start("PHOSPID");
217 if(strstr(option,"print")) {
223 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
225 if (fLastEvent == -1)
226 fLastEvent = gime->MaxEvent() - 1 ;
228 fLastEvent = TMath::Min(fLastEvent,gime->MaxEvent());
229 Int_t nEvents = fLastEvent - fFirstEvent + 1;
232 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
233 gime->Event(ievent,"TR") ;
234 if(gime->TrackSegments() && //Skip events, where no track segments made
235 gime->TrackSegments()->GetEntriesFast()) {
239 if(strstr(option,"deb"))
240 PrintRecParticles(option) ;
241 //increment the total number of rec particles per run
242 fRecParticlesInRun += gime->RecParticles()->GetEntriesFast() ;
245 if(strstr(option,"deb"))
246 PrintRecParticles(option);
247 if(strstr(option,"tim")){
248 gBenchmark->Stop("PHOSPID");
249 Info("Exec", "took %f seconds for PID %f seconds per event",
250 gBenchmark->GetCpuTime("PHOSPID"),
251 gBenchmark->GetCpuTime("PHOSPID")/nEvents) ;
256 //____________________________________________________________________________
257 const TString AliPHOSPIDv1::GetFileNamePrincipal(TString particle) const
259 //Get file name that contains the PCA for a particle ("photon or pi0")
262 if (particle=="photon") name = fFileNamePrincipalPhoton ;
263 else if (particle=="pi0" ) name = fFileNamePrincipalPi0 ;
264 else Error("GetFileNamePrincipal","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
268 //____________________________________________________________________________
269 Float_t AliPHOSPIDv1::GetParameterCalibration(Int_t i) const
271 // Get the i-th parameter "Calibration"
274 Error("GetParameterCalibration","Invalid parameter number: %d",i);
276 param = (*fParameters)(0,i);
280 //____________________________________________________________________________
281 Float_t AliPHOSPIDv1::GetCalibratedEnergy(Float_t e) const
283 // It calibrates Energy depending on the recpoint energy.
284 // The energy of the reconstructed cluster is corrected with
285 // the formula A + B* E + C* E^2, whose parameters where obtained
286 // through the study of the reconstructed energy distribution of
287 // monoenergetic photons.
289 Float_t p[]={0.,0.,0.};
290 for (Int_t i=0; i<3; i++) p[i] = GetParameterCalibration(i);
291 Float_t enerec = p[0] + p[1]*e + p[2]*e*e;
296 //____________________________________________________________________________
297 Float_t AliPHOSPIDv1::GetParameterCpv2Emc(Int_t i, TString axis) const
299 // Get the i-th parameter "CPV-EMC distance" for the specified axis
302 Error("GetParameterCpv2Emc","Invalid parameter number: %d",i);
305 if (axis == "x") param = (*fParameters)(1,i);
306 else if (axis == "z") param = (*fParameters)(2,i);
307 else Error("GetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
312 //____________________________________________________________________________
313 Float_t AliPHOSPIDv1::GetCpv2EmcDistanceCut(TString axis, Float_t e) const
315 // Get CpvtoEmcDistance Cut depending on the cluster energy, axis and
316 // Purity-Efficiency point
319 Float_t p[]={0.,0.,0.};
320 for (Int_t i=0; i<3; i++) p[i] = GetParameterCpv2Emc(i,axis);
321 Float_t sig = p[0] + TMath::Exp(p[1] - p[2]*e);
325 //____________________________________________________________________________
326 Float_t AliPHOSPIDv1::GetEllipseParameter(TString particle, TString param, Float_t e) const
328 // Calculates the parameter param of the ellipse
332 Float_t p[4]={0.,0.,0.,0.};
334 for (Int_t i=0; i<4; i++) p[i] = GetParameterToCalculateEllipse(particle,param,i);
335 if (particle == "photon") {
336 if (param.Contains("a")) e = TMath::Min((Double_t)e,70.);
337 else if (param.Contains("b")) e = TMath::Min((Double_t)e,70.);
338 else if (param.Contains("x0")) e = TMath::Max((Double_t)e,1.1);
341 if (particle == "photon")
342 value = p[0]/TMath::Sqrt(e) + p[1]*e + p[2]*e*e + p[3];
343 else if (particle == "pi0")
344 value = p[0] + p[1]*e + p[2]*e*e;
349 //_____________________________________________________________________________
350 Float_t AliPHOSPIDv1::GetParameterPhotonBoundary (Int_t i) const
352 // Get the parameter "i" to calculate the boundary on the moment M2x
353 // for photons at high p_T
356 Error("GetParameterPhotonBoundary","Wrong parameter number: %d\n",i);
358 param = (*fParameters)(14,i) ;
362 //____________________________________________________________________________
363 Float_t AliPHOSPIDv1::GetParameterPi0Boundary (Int_t i) const
365 // Get the parameter "i" to calculate the boundary on the moment M2x
366 // for pi0 at high p_T
369 Error("GetParameterPi0Boundary","Wrong parameter number: %d\n",i);
371 param = (*fParameters)(15,i) ;
375 //____________________________________________________________________________
376 Float_t AliPHOSPIDv1::GetParameterTimeGate(Int_t i) const
378 // Get TimeGate parameter depending on Purity-Efficiency i:
379 // i=0 - Low purity, i=1 - Medium purity, i=2 - High purity
382 Error("GetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
384 param = (*fParameters)(3,i) ;
388 //_____________________________________________________________________________
389 Float_t AliPHOSPIDv1::GetParameterToCalculateEllipse(TString particle, TString param, Int_t i) const
391 // Get the parameter "i" that is needed to calculate the ellipse
392 // parameter "param" for the particle "particle" ("photon" or "pi0")
397 if (particle == "photon") offset=0;
398 else if (particle == "pi0") offset=5;
400 Error("GetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
405 if (param.Contains("a")) p=4+offset;
406 else if(param.Contains("b")) p=5+offset;
407 else if(param.Contains("c")) p=6+offset;
408 else if(param.Contains("x0"))p=7+offset;
409 else if(param.Contains("y0"))p=8+offset;
412 Error("GetParameterToCalculateEllipse", "No parameter with index", i) ;
414 Error("GetParameterToCalculateEllipse", "No parameter with name %s", param.Data() ) ;
416 par = (*fParameters)(p,i) ;
422 //____________________________________________________________________________
423 Float_t AliPHOSPIDv1::GetDistance(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Option_t * axis)const
425 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
427 const AliPHOSGeometry * geom = AliPHOSGetter::Instance()->PHOSGeometry() ;
431 emc->GetLocalPosition(vecEmc) ;
432 cpv->GetLocalPosition(vecCpv) ;
434 if(emc->GetPHOSMod() == cpv->GetPHOSMod()){
435 // Correct to difference in CPV and EMC position due to different distance to center.
436 // we assume, that particle moves from center
437 Float_t dCPV = geom->GetIPtoOuterCoverDistance();
438 Float_t dEMC = geom->GetIPtoCrystalSurface() ;
440 vecCpv = dEMC * vecCpv - vecEmc ;
441 if (axis == "X") return vecCpv.X();
442 if (axis == "Y") return vecCpv.Y();
443 if (axis == "Z") return vecCpv.Z();
444 if (axis == "R") return vecCpv.Mag();
450 //____________________________________________________________________________
451 Int_t AliPHOSPIDv1::GetCPVBit(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Int_t effPur, Float_t e) const
453 if(effPur>2 || effPur<0)
454 Error("GetCPVBit","Invalid Efficiency-Purity choice %d",effPur);
456 Float_t sigX = GetCpv2EmcDistanceCut("X",e);
457 Float_t sigZ = GetCpv2EmcDistanceCut("Z",e);
459 Float_t deltaX = TMath::Abs(GetDistance(emc, cpv, "X"));
460 Float_t deltaZ = TMath::Abs(GetDistance(emc, cpv, "Z"));
462 if((deltaX>sigX*(effPur+1))|(deltaZ>sigZ*(effPur+1)))
468 //____________________________________________________________________________
469 Int_t AliPHOSPIDv1::GetPrincipalBit(TString particle, const Double_t* p, Int_t effPur, Float_t e)const
471 //Is the particle inside de PCA ellipse?
475 Float_t a = GetEllipseParameter(particle,"a" , e);
476 Float_t b = GetEllipseParameter(particle,"b" , e);
477 Float_t c = GetEllipseParameter(particle,"c" , e);
478 Float_t x0 = GetEllipseParameter(particle,"x0", e);
479 Float_t y0 = GetEllipseParameter(particle,"y0", e);
481 Float_t r = TMath::Power((p[0] - x0)/a,2) +
482 TMath::Power((p[1] - y0)/b,2) +
483 c*(p[0] - x0)*(p[1] - y0)/(a*b) ;
484 //3 different ellipses defined
485 if((effPur==2) && (r<1./2.)) prinbit= 1;
486 if((effPur==1) && (r<2. )) prinbit= 1;
487 if((effPur==0) && (r<9./2.)) prinbit= 1;
490 Error("GetPrincipalBit", "Negative square?") ;
495 //____________________________________________________________________________
496 Int_t AliPHOSPIDv1::GetHardPhotonBit(AliPHOSEmcRecPoint * emc) const
498 // Set bit for identified hard photons (E > 30 GeV)
499 // if the second moment M2x is below the boundary
501 Float_t e = emc->GetEnergy();
502 if (e < 30.0) return 0;
503 Float_t m2x = emc->GetM2x();
504 Float_t m2xBoundary = GetParameterPhotonBoundary(0) *
505 TMath::Exp(-TMath::Power(e-GetParameterPhotonBoundary(1),2)/2.0/
506 TMath::Power(GetParameterPhotonBoundary(2),2)) +
507 GetParameterPhotonBoundary(3);
508 //Info("GetHardPhotonBit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
509 if (m2x < m2xBoundary)
510 return 1;// A hard photon
512 return 0;// Not a hard photon
515 //____________________________________________________________________________
516 Int_t AliPHOSPIDv1::GetHardPi0Bit(AliPHOSEmcRecPoint * emc) const
518 // Set bit for identified hard pi0 (E > 30 GeV)
519 // if the second moment M2x is above the boundary
521 Float_t e = emc->GetEnergy();
522 if (e < 30.0) return 0;
523 Float_t m2x = emc->GetM2x();
524 Float_t m2xBoundary = GetParameterPi0Boundary(0) +
525 e * GetParameterPi0Boundary(1);
526 //Info("GetHardPi0Bit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
527 if (m2x > m2xBoundary)
528 return 1;// A hard pi0
530 return 0;// Not a hard pi0
533 //____________________________________________________________________________
534 TVector3 AliPHOSPIDv1::GetMomentumDirection(AliPHOSEmcRecPoint * emc, AliPHOSCpvRecPoint * )const
536 // Calculates the momentum direction:
537 // 1. if only a EMC RecPoint, direction is given by IP and this RecPoint
538 // 2. if a EMC RecPoint and CPV RecPoint, direction is given by the line through the 2 recpoints
539 // However because of the poor position resolution of PPSD the direction is always taken as if we were
542 TVector3 dir(0,0,0) ;
544 TVector3 emcglobalpos ;
547 emc->GetGlobalPosition(emcglobalpos, dummy) ;
553 //account correction to the position of IP
554 Float_t xo,yo,zo ; //Coordinates of the origin
555 gAlice->Generator()->GetOrigin(xo,yo,zo) ;
556 TVector3 origin(xo,yo,zo);
562 //____________________________________________________________________________
563 void AliPHOSPIDv1::MakePID()
565 // construct the PID weight from a Bayesian Method
568 const Int_t kSPECIES = AliESDtrack::kSPECIESN ;
569 Double_t pid[kSPECIES] = {0., 0., 0., 0., 0., 0.} ;
570 Int_t nparticles = AliPHOSGetter::Instance()->RecParticles()->GetEntriesFast() ;
571 // const Int_t kMAXPARTICLES = 2000 ;
572 // if (nparticles >= kMAXPARTICLES)
573 // Error("MakePID", "Change size of MAXPARTICLES") ;
574 // Double_t stof[kSPECIES][kMAXPARTICLES] ;
575 Double_t * stof[kSPECIES];
576 for (Int_t i =0; i< kSPECIES; i++)
577 stof[i] = new Double_t[nparticles];
579 // make the normalized distribution of pid for this event
580 // w(pid) in the Bayesian formulation
581 for(index = 0 ; index < nparticles ; index ++) {
582 AliPHOSRecParticle * recpar = AliPHOSGetter::Instance()->RecParticle(index) ;
584 pid[AliESDtrack::kKaon0] = 0 ;
586 if (recpar->IsPhoton() || recpar->IsHardPhoton())
587 pid[AliESDtrack::kPhoton]++ ;
589 else if (recpar->IsPi0() || recpar->IsHardPi0())
590 pid[AliESDtrack::kPi0]++ ;
592 else if (recpar->IsElectron()) {
593 pid[AliESDtrack::kElectron]++ ;
594 pid[AliESDtrack::kMuon]++ ;
597 else if (recpar->IsChargedHadron()){
598 pid[AliESDtrack::kPion]++ ;
599 pid[AliESDtrack::kKaon]++ ;
600 pid[AliESDtrack::kProton]++ ;
603 else if (recpar->IsNeutralHadron())
604 pid[AliESDtrack::kNeutron]++ ;
606 else if (recpar->IsEleCon())
607 pid[AliESDtrack::kEleCon]++ ;
609 // now get the signals probability
610 // s(pid) in the Bayesian formulation
612 stof[AliESDtrack::kPhoton][index] = fTFphoton->Eval(recpar->ToF()) ;
613 stof[AliESDtrack::kPi0][index] = fTFphoton->Eval(recpar->ToF()) ; // pi0 are detected via decay photon
614 stof[AliESDtrack::kElectron][index] = fTFelectron->Eval(recpar->ToF()) ;
615 stof[AliESDtrack::kPion][index] = fTFchargedhadron->Eval(recpar->ToF()) ;
616 stof[AliESDtrack::kKaon][index] = fTFchargedhadron->Eval(recpar->ToF()) ;
617 stof[AliESDtrack::kProton][index] = fTFchargedhadron->Eval(recpar->ToF()) ;
618 stof[AliESDtrack::kNeutron][index] = fTFneutralhadron->Eval(recpar->ToF()) ;
619 stof[AliESDtrack::kEleCon][index] = fTFphoton->Eval(recpar->ToF()) ; // a conversion electron has the photon ToF
620 stof[AliESDtrack::kKaon0][index] = 0 ; // do not know yet what to to with K0
621 stof[AliESDtrack::kMuon][index] = 0 ; // do not know yet what to do with muon
624 for (index = 0 ; index < kSPECIES ; index++)
625 pid[index] /= nparticles ;
628 for(index = 0 ; index < nparticles ; index ++) {
629 // calculates the Bayesian weight
632 for (jndex = 0 ; jndex < kSPECIES ; jndex++)
633 wn += stof[jndex][index] * pid[jndex] ;
634 AliPHOSRecParticle * recpar = AliPHOSGetter::Instance()->RecParticle(index) ;
635 if (TMath::Abs(wn)>0)
636 for (jndex = 0 ; jndex < kSPECIES ; jndex++) {
637 recpar->SetPID(jndex, stof[jndex][index] * pid[jndex] / wn) ;
640 for (Int_t i =0; i< kSPECIES; i++)
644 //____________________________________________________________________________
645 void AliPHOSPIDv1::MakeRecParticles()
647 // Makes a RecParticle out of a TrackSegment
649 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
650 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
651 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
652 TClonesArray * trackSegments = gime->TrackSegments() ;
653 if ( !emcRecPoints || !cpvRecPoints || !trackSegments ) {
654 Fatal("MakeRecParticles", "RecPoints or TrackSegments not found !") ;
656 TClonesArray * recParticles = gime->RecParticles() ;
657 recParticles->Clear();
659 TIter next(trackSegments) ;
660 AliPHOSTrackSegment * ts ;
662 AliPHOSRecParticle * rp ;
663 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
665 new( (*recParticles)[index] ) AliPHOSRecParticle() ;
666 rp = (AliPHOSRecParticle *)recParticles->At(index) ;
667 rp->SetTrackSegment(index) ;
668 rp->SetIndexInList(index) ;
670 AliPHOSEmcRecPoint * emc = 0 ;
671 if(ts->GetEmcIndex()>=0)
672 emc = (AliPHOSEmcRecPoint *) emcRecPoints->At(ts->GetEmcIndex()) ;
674 AliPHOSCpvRecPoint * cpv = 0 ;
675 if(ts->GetCpvIndex()>=0)
676 cpv = (AliPHOSCpvRecPoint *) cpvRecPoints->At(ts->GetCpvIndex()) ;
679 track = ts->GetTrackIndex() ;
681 // Now set type (reconstructed) of the particle
683 // Choose the cluster energy range
686 Fatal("MakeRecParticles", "-> emc(%d) = %d", ts->GetEmcIndex(), emc ) ;
689 Float_t e = emc->GetEnergy() ;
692 emc->GetElipsAxis(lambda) ;
694 if((lambda[0]>0.01) && (lambda[1]>0.01)){
695 // Looking PCA. Define and calculate the data (X),
696 // introduce in the function X2P that gives the components (P).
699 Float_t Emaxdtotal = 0. ;
701 if((lambda[0]+lambda[1])!=0)
702 Spher=fabs(lambda[0]-lambda[1])/(lambda[0]+lambda[1]);
704 Emaxdtotal=emc->GetMaximalEnergy()/emc->GetEnergy();
708 fX[2] = emc->GetDispersion() ;
710 fX[4] = emc->GetMultiplicity() ;
712 fX[6] = emc->GetCoreEnergy() ;
714 fPrincipalPhoton->X2P(fX,fPPhoton);
715 fPrincipalPi0 ->X2P(fX,fPPi0);
719 fPPhoton[0]=-100.0; //We do not accept clusters with
720 fPPhoton[1]=-100.0; //one cell as a photon-like
725 Float_t time = emc->GetTime() ;
728 // Loop of Efficiency-Purity (the 3 points of purity or efficiency
729 // are taken into account to set the particle identification)
730 for(Int_t effPur = 0; effPur < 3 ; effPur++){
732 // Looking at the CPV detector. If RCPV greater than CpvEmcDistance,
733 // 1st,2nd or 3rd bit (depending on the efficiency-purity point )
735 if(GetCPVBit(emc, cpv, effPur,e) == 1 )
736 rp->SetPIDBit(effPur) ;
738 // Looking the TOF. If TOF smaller than gate, 4th, 5th or 6th
739 // bit (depending on the efficiency-purity point )is set to 1
740 if(time< (*fParameters)(3,effPur))
741 rp->SetPIDBit(effPur+3) ;
744 //If we are inside the ellipse, 7th, 8th or 9th
745 // bit (depending on the efficiency-purity point )is set to 1
746 if(GetPrincipalBit("photon",fPPhoton,effPur,e) == 1)
747 rp->SetPIDBit(effPur+6) ;
750 //If we are inside the ellipse, 10th, 11th or 12th
751 // bit (depending on the efficiency-purity point )is set to 1
752 if(GetPrincipalBit("pi0" ,fPPi0 ,effPur,e) == 1)
753 rp->SetPIDBit(effPur+9) ;
755 if(GetHardPhotonBit(emc))
757 if(GetHardPi0Bit (emc))
763 //Set momentum, energy and other parameters
764 Float_t encal = GetCalibratedEnergy(e);
765 TVector3 dir = GetMomentumDirection(emc,cpv) ;
767 rp->SetMomentum(dir.X(),dir.Y(),dir.Z(),encal) ;
769 rp->Name(); //If photon sets the particle pdg name to gamma
770 rp->SetProductionVertex(0,0,0,0);
771 rp->SetFirstMother(-1);
772 rp->SetLastMother(-1);
773 rp->SetFirstDaughter(-1);
774 rp->SetLastDaughter(-1);
775 rp->SetPolarisation(0,0,0);
776 //Set the position in global coordinate system from the RecPoint
777 AliPHOSGeometry * geom = gime->PHOSGeometry() ;
778 AliPHOSTrackSegment * ts = gime->TrackSegment(rp->GetPHOSTSIndex()) ;
779 AliPHOSEmcRecPoint * erp = gime->EmcRecPoint(ts->GetEmcIndex()) ;
781 geom->GetGlobal(erp, pos) ;
787 //____________________________________________________________________________
788 void AliPHOSPIDv1::Print() const
790 // Print the parameters used for the particle type identification
792 Info("Print", "=============== AliPHOSPIDv1 ================") ;
793 printf("Making PID\n") ;
794 printf(" Pricipal analysis file from 0.5 to 100 %s\n", fFileNamePrincipalPhoton.Data() ) ;
795 printf(" Name of parameters file %s\n", fFileNameParameters.Data() ) ;
796 printf(" Matrix of Parameters: 14x4\n") ;
797 printf(" Energy Calibration 1x3 [3 parametres to calibrate energy: A + B* E + C * E^2]\n") ;
798 printf(" RCPV 2x3 rows x and z, columns function cut parameters\n") ;
799 printf(" TOF 1x3 [High Eff-Low Pur,Medium Eff-Pur, Low Eff-High Pur]\n") ;
800 printf(" PCA 5x4 [5 ellipse parametres and 4 parametres to calculate them: A/Sqrt(E) + B* E + C * E^2 + D]\n") ;
801 Printf(" Pi0 PCA 5x3 [5 ellipse parametres and 3 parametres to calculate them: A + B* E + C * E^2]\n") ;
802 fParameters->Print() ;
807 //____________________________________________________________________________
808 void AliPHOSPIDv1::PrintRecParticles(Option_t * option)
810 // Print table of reconstructed particles
812 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
814 TClonesArray * recParticles = gime->RecParticles() ;
817 message = "\nevent " ;
818 message += gAlice->GetEvNumber() ;
819 message += " found " ;
820 message += recParticles->GetEntriesFast();
821 message += " RecParticles\n" ;
823 if(strstr(option,"all")) { // printing found TS
824 message += "\n PARTICLE Index \n" ;
827 for (index = 0 ; index < recParticles->GetEntries() ; index++) {
828 AliPHOSRecParticle * rp = (AliPHOSRecParticle * ) recParticles->At(index) ;
830 message += rp->Name().Data() ;
832 message += rp->GetIndexInList() ;
834 message += rp->GetType() ;
837 Info("Print", message.Data() ) ;
840 //____________________________________________________________________________
841 void AliPHOSPIDv1::SetParameters()
843 // PCA : To do the Principal Components Analysis it is necessary
844 // the Principal file, which is opened here
845 fX = new double[7]; // Data for the PCA
846 fPPhoton = new double[7]; // Eigenvalues of the PCA
847 fPPi0 = new double[7]; // Eigenvalues of the Pi0 PCA
849 // Read photon principals from the photon file
851 fFileNamePrincipalPhoton = "$ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root" ;
852 TFile f( fFileNamePrincipalPhoton.Data(), "read" ) ;
853 fPrincipalPhoton = dynamic_cast<TPrincipal*> (f.Get("principal")) ;
856 // Read pi0 principals from the pi0 file
858 fFileNamePrincipalPi0 = "$ALICE_ROOT/PHOS/PCA_pi0_40-120.root" ;
859 TFile fPi0( fFileNamePrincipalPi0.Data(), "read" ) ;
860 fPrincipalPi0 = dynamic_cast<TPrincipal*> (fPi0.Get("principal")) ;
863 // Open parameters file and initialization of the Parameters matrix.
864 // In the File Parameters.dat are all the parameters. These are introduced
865 // in a matrix of 16x4
867 // All the parameters defined in this file are, in order of row:
868 // line 0 : calibration
869 // lines 1,2 : CPV rectangular cat for X and Z
871 // lines 4-8 : parameters to calculate photon PCA ellipse
872 // lines 9-13: parameters to calculate pi0 PCA ellipse
873 // lines 14-15: parameters to calculate border for high-pt photons and pi0
875 fFileNameParameters = gSystem->ExpandPathName("$ALICE_ROOT/PHOS/Parameters.dat");
876 fParameters = new TMatrix(16,4) ;
877 const Int_t maxLeng=255;
878 char string[maxLeng];
880 // Open a text file with PID parameters
881 FILE *fd = fopen(fFileNameParameters.Data(),"r");
883 Fatal("SetParameter","File %s with a PID parameters cannot be opened\n",
884 fFileNameParameters.Data());
887 // Read parameter file line-by-line and skip empty line and comments
888 while (fgets(string,maxLeng,fd) != NULL) {
889 if (string[0] == '\n' ) continue;
890 if (string[0] == '!' ) continue;
891 sscanf(string, "%f %f %f %f",
892 &(*fParameters)(i,0), &(*fParameters)(i,1),
893 &(*fParameters)(i,2), &(*fParameters)(i,3));
895 //Info("SetParameters", "line %d: %s",i,string);
900 //____________________________________________________________________________
901 void AliPHOSPIDv1::SetParameterCalibration(Int_t i,Float_t param)
903 // Set parameter "Calibration" i to a value param
905 Error("SetParameterCalibration","Invalid parameter number: %d",i);
907 (*fParameters)(0,i) = param ;
910 //____________________________________________________________________________
911 void AliPHOSPIDv1::SetParameterCpv2Emc(Int_t i, TString axis, Float_t cut)
913 // Set the parameters to calculate Cpv-to-Emc Distance Cut depending on
914 // Purity-Efficiency point i
917 Error("SetParameterCpv2Emc","Invalid parameter number: %d",i);
920 if (axis == "x") (*fParameters)(1,i) = cut;
921 else if (axis == "z") (*fParameters)(2,i) = cut;
922 else Error("SetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
926 //____________________________________________________________________________
927 void AliPHOSPIDv1::SetParameterPhotonBoundary(Int_t i,Float_t param)
929 // Set parameter "Hard photon boundary" i to a value param
931 Error("SetParameterPhotonBoundary","Invalid parameter number: %d",i);
933 (*fParameters)(14,i) = param ;
936 //____________________________________________________________________________
937 void AliPHOSPIDv1::SetParameterPi0Boundary(Int_t i,Float_t param)
939 // Set parameter "Hard pi0 boundary" i to a value param
941 Error("SetParameterPi0Boundary","Invalid parameter number: %d",i);
943 (*fParameters)(15,i) = param ;
946 //_____________________________________________________________________________
947 void AliPHOSPIDv1::SetParameterTimeGate(Int_t i, Float_t gate)
949 // Set the parameter TimeGate depending on Purity-Efficiency point i
951 Error("SetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
953 (*fParameters)(3,i)= gate ;
956 //_____________________________________________________________________________
957 void AliPHOSPIDv1::SetParameterToCalculateEllipse(TString particle, TString param, Int_t i, Float_t par)
959 // Set the parameter "i" that is needed to calculate the ellipse
960 // parameter "param" for a particle "particle"
967 if (particle == "photon") offset=0;
968 else if (particle == "pi0") offset=5;
970 Error("SetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
972 if (param.Contains("a")) p=4+offset;
973 else if(param.Contains("b")) p=5+offset;
974 else if(param.Contains("c")) p=6+offset;
975 else if(param.Contains("x0"))p=7+offset;
976 else if(param.Contains("y0"))p=8+offset;
978 Error("SetEllipseParameter", "No parameter with index %d", i) ;
980 Error("SetEllipseParameter", "No parameter with name %s", param.Data() ) ;
982 (*fParameters)(p,i) = par ;
985 //____________________________________________________________________________
986 void AliPHOSPIDv1::Unload()
988 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
989 gime->PhosLoader()->UnloadRecPoints() ;
990 gime->PhosLoader()->UnloadTracks() ;
991 gime->PhosLoader()->UnloadRecParticles() ;
994 //____________________________________________________________________________
995 void AliPHOSPIDv1::WriteRecParticles()
998 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
1000 TClonesArray * recParticles = gime->RecParticles() ;
1001 recParticles->Expand(recParticles->GetEntriesFast() ) ;
1002 TTree * treeP = gime->TreeP();
1005 Int_t bufferSize = 32000 ;
1006 TBranch * rpBranch = treeP->Branch("PHOSRP",&recParticles,bufferSize);
1007 rpBranch->SetTitle(BranchName());
1011 gime->WriteRecParticles("OVERWRITE");
1012 gime->WritePID("OVERWRITE");