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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
16/* $Id$ */
17
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.
22// - TOF
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.
42//
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
47// TMatrixD object.
48//
49// use case:
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
60//
61// root [2] AliPHOSPIDv1 * p2 = new AliPHOSPIDv1("galice1.root","v1",kTRUE)
62// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
63// //Split mode.
64// root [3] p2->ExecuteTask()
65//
66
67
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
77// of the energy.
78//
79//
80//
81// --- ROOT system ---
82#include "TROOT.h"
83#include "TTree.h"
84#include "TFile.h"
85#include "TF2.h"
86#include "TFormula.h"
87#include "TCanvas.h"
88#include "TFolder.h"
89#include "TSystem.h"
90#include "TBenchmark.h"
91#include "TMatrixD.h"
92#include "TPrincipal.h"
93#include "TSystem.h"
94
95// --- Standard library ---
96
97
98// --- AliRoot header files ---
99
100#include "AliGenerator.h"
101#include "AliPHOS.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"
110
111ClassImp( AliPHOSPIDv1)
112
113//____________________________________________________________________________
114AliPHOSPIDv1::AliPHOSPIDv1():AliPHOSPID()
115{
116 // default ctor
117
118 InitParameters() ;
119 fDefaultInit = kTRUE ;
120}
121
122//____________________________________________________________________________
123AliPHOSPIDv1::AliPHOSPIDv1(const AliPHOSPIDv1 & pid ):AliPHOSPID(pid)
124{
125 // ctor
126 InitParameters() ;
127 Init() ;
128
129}
130
131//____________________________________________________________________________
132AliPHOSPIDv1::AliPHOSPIDv1(const TString alirunFileName, const TString eventFolderName):AliPHOSPID(alirunFileName, eventFolderName)
133{
134 //ctor with the indication on where to look for the track segments
135
136 InitParameters() ;
137 Init() ;
138 fDefaultInit = kFALSE ;
139}
140
141//____________________________________________________________________________
142AliPHOSPIDv1::~AliPHOSPIDv1()
143{
144 // dtor
145
146 delete [] fX ; // Principal input
147 delete [] fPPhoton ; // Photon Principal components
148 delete [] fPPi0 ; // Pi0 Principal components
149}
150//____________________________________________________________________________
151const TString AliPHOSPIDv1::BranchName() const
152{
153
154 return GetName() ;
155}
156
157//____________________________________________________________________________
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
162
163 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data()) ;
164
165 if ( !gime->PID() )
166 gime->PostPID(this) ;
167}
168
169//____________________________________________________________________________
170void AliPHOSPIDv1::InitParameters()
171{
172 // Initialize PID parameters
173 fRecParticlesInRun = 0 ;
174 fNEvent = 0 ;
175 fRecParticlesInRun = 0 ;
176 SetParameters() ; // fill the parameters matrix from parameters file
177 SetEventRange(0,-1) ;
178}
179
180//________________________________________________________________________
181void AliPHOSPIDv1::Exec(Option_t *option)
182{
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.
187
188 if(strstr(option,"tim"))
189 gBenchmark->Start("PHOSPID");
190
191 if(strstr(option,"print")) {
192 Print() ;
193 return ;
194 }
195
196
197 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
198
199 if (fLastEvent == -1)
200 fLastEvent = gime->MaxEvent() - 1 ;
201 else
202 fLastEvent = TMath::Min(fLastEvent,gime->MaxEvent());
203 Int_t nEvents = fLastEvent - fFirstEvent + 1;
204
205 Int_t ievent ;
206 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
207 gime->Event(ievent,"TR") ;
208 if(gime->TrackSegments() && //Skip events, where no track segments made
209 gime->TrackSegments()->GetEntriesFast()) {
210 MakeRecParticles() ;
211 WriteRecParticles();
212 if(strstr(option,"deb"))
213 PrintRecParticles(option) ;
214 //increment the total number of rec particles per run
215 fRecParticlesInRun += gime->RecParticles()->GetEntriesFast() ;
216 }
217 }
218 if(strstr(option,"deb"))
219 PrintRecParticles(option);
220 if(strstr(option,"tim")){
221 gBenchmark->Stop("PHOSPID");
222 Info("Exec", "took %f seconds for PID %f seconds per event",
223 gBenchmark->GetCpuTime("PHOSPID"),
224 gBenchmark->GetCpuTime("PHOSPID")/nEvents) ;
225 }
226
227 Unload();
228}
229
230//____________________________________________________________________________
231const TString AliPHOSPIDv1::GetFileNamePrincipal(TString particle) const
232{
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}
241
242//____________________________________________________________________________
243Float_t AliPHOSPIDv1::GetParameterCalibration(Int_t i) const
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);
249 else
250 param = (*fParameters)(0,i);
251 return param;
252}
253
254//____________________________________________________________________________
255Float_t AliPHOSPIDv1::GetCalibratedEnergy(Float_t e) const
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//____________________________________________________________________________
271Float_t AliPHOSPIDv1::GetParameterCpv2Emc(Int_t i, TString axis) const
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//____________________________________________________________________________
287Float_t AliPHOSPIDv1::GetCpv2EmcDistanceCut(TString axis, Float_t e) const
288{
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;
297}
298
299//____________________________________________________________________________
300Float_t AliPHOSPIDv1::GetEllipseParameter(TString particle, TString param, Float_t e) const
301{
302 // Calculates the parameter param of the ellipse
303
304 particle.ToLower();
305 param. ToLower();
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 }
314
315 value = p[0]/TMath::Sqrt(e) + p[1]*e + p[2]*e*e + p[3];
316 return value;
317}
318
319//_____________________________________________________________________________
320Float_t AliPHOSPIDv1::GetParameterPhotonBoundary (Int_t i) const
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;
330}
331
332//____________________________________________________________________________
333Float_t AliPHOSPIDv1::GetParameterPi0Boundary (Int_t i) const
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}
344
345//____________________________________________________________________________
346Float_t AliPHOSPIDv1::GetParameterTimeGate(Int_t i) const
347{
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.;
351 if(i>2 || i<0)
352 Error("GetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
353 else
354 param = (*fParameters)(3,i) ;
355 return param;
356}
357
358//_____________________________________________________________________________
359Float_t AliPHOSPIDv1::GetParameterToCalculateEllipse(TString particle, TString param, Int_t i) const
360{
361 // Get the parameter "i" that is needed to calculate the ellipse
362 // parameter "param" for the particle "particle" ("photon" or "pi0")
363
364 particle.ToLower();
365 param. ToLower();
366 Int_t offset = -1;
367 if (particle == "photon") offset=0;
368 else if (particle == "pi0") offset=5;
369 else
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;
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;
380
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() ) ;
385 else
386 par = (*fParameters)(p,i) ;
387
388 return par;
389}
390
391
392//____________________________________________________________________________
393Float_t AliPHOSPIDv1::GetDistance(AliPHOSEmcRecPoint * emc,AliPHOSRecPoint * cpv, Option_t * axis)const
394{
395 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
396
397 const AliPHOSGeometry * geom = AliPHOSGetter::Instance()->PHOSGeometry() ;
398 TVector3 vecEmc ;
399 TVector3 vecCpv ;
400 if(cpv){
401 emc->GetLocalPosition(vecEmc) ;
402 cpv->GetLocalPosition(vecCpv) ;
403 if(emc->GetPHOSMod() == cpv->GetPHOSMod()){
404 // Correct to difference in CPV and EMC position due to different distance to center.
405 // we assume, that particle moves from center
406 Float_t dCPV = geom->GetIPtoOuterCoverDistance();
407 Float_t dEMC = geom->GetIPtoCrystalSurface() ;
408 dEMC = dEMC / dCPV ;
409 vecCpv = dEMC * vecCpv - vecEmc ;
410 if (axis == "X") return vecCpv.X();
411 if (axis == "Y") return vecCpv.Y();
412 if (axis == "Z") return vecCpv.Z();
413 if (axis == "R") return vecCpv.Mag();
414 }
415 return 100000000 ;
416 }
417 return 100000000 ;
418}
419//____________________________________________________________________________
420Int_t AliPHOSPIDv1::GetCPVBit(AliPHOSEmcRecPoint * emc,AliPHOSRecPoint * cpv, Int_t effPur, Float_t e) const
421{
422 if(effPur>2 || effPur<0)
423 Error("GetCPVBit","Invalid Efficiency-Purity choice %d",effPur);
424
425 Float_t sigX = GetCpv2EmcDistanceCut("X",e);
426 Float_t sigZ = GetCpv2EmcDistanceCut("Z",e);
427
428 Float_t deltaX = TMath::Abs(GetDistance(emc, cpv, "X"));
429 Float_t deltaZ = TMath::Abs(GetDistance(emc, cpv, "Z"));
430
431 if((deltaX>sigX*(effPur+1))|(deltaZ>sigZ*(effPur+1)))
432 return 1;//Neutral
433 else
434 return 0;//Charged
435}
436
437//____________________________________________________________________________
438Int_t AliPHOSPIDv1::GetPrincipalBit(TString particle, const Double_t* p, Int_t effPur, Float_t e)const
439{
440 //Is the particle inside de PCA ellipse?
441
442 particle.ToLower();
443 Int_t prinbit = 0 ;
444 Float_t a = GetEllipseParameter(particle,"a" , e);
445 Float_t b = GetEllipseParameter(particle,"b" , e);
446 Float_t c = GetEllipseParameter(particle,"c" , e);
447 Float_t x0 = GetEllipseParameter(particle,"x0", e);
448 Float_t y0 = GetEllipseParameter(particle,"y0", e);
449
450 Float_t r = TMath::Power((p[0] - x0)/a,2) +
451 TMath::Power((p[1] - y0)/b,2) +
452 c*(p[0] - x0)*(p[1] - y0)/(a*b) ;
453 //3 different ellipses defined
454 if((effPur==2) && (r<1./2.)) prinbit= 1;
455 if((effPur==1) && (r<2. )) prinbit= 1;
456 if((effPur==0) && (r<9./2.)) prinbit= 1;
457
458 if(r<0)
459 Error("GetPrincipalBit", "Negative square?") ;
460
461 return prinbit;
462
463}
464//____________________________________________________________________________
465Int_t AliPHOSPIDv1::GetHardPhotonBit(AliPHOSEmcRecPoint * emc) const
466{
467 // Set bit for identified hard photons (E > 30 GeV)
468 // if the second moment M2x is below the boundary
469
470 Float_t e = emc->GetEnergy();
471 if (e < 30.0) return 0;
472 Float_t m2x = emc->GetM2x();
473 Float_t m2xBoundary = GetParameterPhotonBoundary(0) *
474 TMath::Exp(-TMath::Power(e-GetParameterPhotonBoundary(1),2)/2.0/
475 TMath::Power(GetParameterPhotonBoundary(2),2)) +
476 GetParameterPhotonBoundary(3);
477 Info("GetHardPhotonBit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
478 if (m2x < m2xBoundary)
479 return 1;// A hard photon
480 else
481 return 0;// Not a hard photon
482}
483
484//____________________________________________________________________________
485Int_t AliPHOSPIDv1::GetHardPi0Bit(AliPHOSEmcRecPoint * emc) const
486{
487 // Set bit for identified hard pi0 (E > 30 GeV)
488 // if the second moment M2x is above the boundary
489
490 Float_t e = emc->GetEnergy();
491 if (e < 30.0) return 0;
492 Float_t m2x = emc->GetM2x();
493 Float_t m2xBoundary = GetParameterPi0Boundary(0) +
494 e * GetParameterPi0Boundary(1);
495 Info("GetHardPi0Bit","E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary);
496 if (m2x > m2xBoundary)
497 return 1;// A hard pi0
498 else
499 return 0;// Not a hard pi0
500}
501
502//____________________________________________________________________________
503TVector3 AliPHOSPIDv1::GetMomentumDirection(AliPHOSEmcRecPoint * emc, AliPHOSRecPoint * )const
504{
505 // Calculates the momentum direction:
506 // 1. if only a EMC RecPoint, direction is given by IP and this RecPoint
507 // 2. if a EMC RecPoint and CPV RecPoint, direction is given by the line through the 2 recpoints
508 // However because of the poor position resolution of PPSD the direction is always taken as if we were
509 // in case 1.
510
511 TVector3 dir(0,0,0) ;
512
513 TVector3 emcglobalpos ;
514 TMatrix dummy ;
515
516 emc->GetGlobalPosition(emcglobalpos, dummy) ;
517
518
519 dir = emcglobalpos ;
520 dir.SetMag(1.) ;
521
522 //account correction to the position of IP
523 Float_t xo,yo,zo ; //Coordinates of the origin
524 gAlice->Generator()->GetOrigin(xo,yo,zo) ;
525 TVector3 origin(xo,yo,zo);
526 dir = dir - origin ;
527
528 return dir ;
529}
530
531//____________________________________________________________________________
532void AliPHOSPIDv1::MakeRecParticles()
533{
534 // Makes a RecParticle out of a TrackSegment
535
536 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
537 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
538 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
539 TClonesArray * trackSegments = gime->TrackSegments() ;
540 if ( !emcRecPoints || !cpvRecPoints || !trackSegments ) {
541 Fatal("MakeRecParticles", "RecPoints or TrackSegments not found !") ;
542 }
543 TClonesArray * recParticles = gime->RecParticles() ;
544 recParticles->Clear();
545
546 TIter next(trackSegments) ;
547 AliPHOSTrackSegment * ts ;
548 Int_t index = 0 ;
549 AliPHOSRecParticle * rp ;
550 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
551
552 new( (*recParticles)[index] ) AliPHOSRecParticle() ;
553 rp = (AliPHOSRecParticle *)recParticles->At(index) ;
554 rp->SetTrackSegment(index) ;
555 rp->SetIndexInList(index) ;
556
557 AliPHOSEmcRecPoint * emc = 0 ;
558 if(ts->GetEmcIndex()>=0)
559 emc = (AliPHOSEmcRecPoint *) emcRecPoints->At(ts->GetEmcIndex()) ;
560
561 AliPHOSRecPoint * cpv = 0 ;
562 if(ts->GetCpvIndex()>=0)
563 cpv = (AliPHOSRecPoint *) cpvRecPoints->At(ts->GetCpvIndex()) ;
564
565 // Now set type (reconstructed) of the particle
566
567 // Choose the cluster energy range
568
569 if (!emc) {
570 Fatal("MakeRecParticles", "-> emc(%d) = %d", ts->GetEmcIndex(), emc ) ;
571 }
572
573 Float_t e = emc->GetEnergy() ;
574
575 Float_t lambda[2] ;
576 emc->GetElipsAxis(lambda) ;
577
578 if((lambda[0]>0.01) && (lambda[1]>0.01)){
579 // Looking PCA. Define and calculate the data (X),
580 // introduce in the function X2P that gives the components (P).
581
582 Float_t Spher = 0. ;
583 Float_t Emaxdtotal = 0. ;
584
585 if((lambda[0]+lambda[1])!=0)
586 Spher=fabs(lambda[0]-lambda[1])/(lambda[0]+lambda[1]);
587
588 Emaxdtotal=emc->GetMaximalEnergy()/emc->GetEnergy();
589
590 fX[0] = lambda[0] ;
591 fX[1] = lambda[1] ;
592 fX[2] = emc->GetDispersion() ;
593 fX[3] = Spher ;
594 fX[4] = emc->GetMultiplicity() ;
595 fX[5] = Emaxdtotal ;
596 fX[6] = emc->GetCoreEnergy() ;
597
598 fPrincipalPhoton->X2P(fX,fPPhoton);
599 fPrincipalPi0 ->X2P(fX,fPPi0);
600
601 }
602 else{
603 fPPhoton[0]=-100.0; //We do not accept clusters with
604 fPPhoton[1]=-100.0; //one cell as a photon-like
605 fPPi0[0] =-100.0;
606 fPPi0[1] =-100.0;
607 }
608
609 Float_t time =emc->GetTime() ;
610
611 // Loop of Efficiency-Purity (the 3 points of purity or efficiency
612 // are taken into account to set the particle identification)
613 for(Int_t effPur = 0; effPur < 3 ; effPur++){
614
615 // Looking at the CPV detector. If RCPV greater than CpvEmcDistance,
616 // 1st,2nd or 3rd bit (depending on the efficiency-purity point )
617 // is set to 1
618 if(GetCPVBit(emc, cpv, effPur,e) == 1 )
619 rp->SetPIDBit(effPur) ;
620
621 // Looking the TOF. If TOF smaller than gate, 4th, 5th or 6th
622 // bit (depending on the efficiency-purity point )is set to 1
623 if(time< (*fParameters)(2,effPur))
624 rp->SetPIDBit(effPur+3) ;
625
626 //Photon PCA
627 //If we are inside the ellipse, 7th, 8th or 9th
628 // bit (depending on the efficiency-purity point )is set to 1
629 if(GetPrincipalBit("photon",fPPhoton,effPur,e) == 1)
630 rp->SetPIDBit(effPur+6) ;
631
632 //Pi0 PCA
633 //If we are inside the ellipse, 10th, 11th or 12th
634 // bit (depending on the efficiency-purity point )is set to 1
635 if(GetPrincipalBit("pi0" ,fPPi0 ,effPur,e) == 1)
636 rp->SetPIDBit(effPur+9) ;
637 }
638 if(GetHardPhotonBit(emc))
639 rp->SetPIDBit(12) ;
640 if(GetHardPi0Bit (emc))
641 rp->SetPIDBit(13) ;
642
643 //Set momentum, energy and other parameters
644 Float_t encal = GetCalibratedEnergy(e);
645 TVector3 dir = GetMomentumDirection(emc,cpv) ;
646 dir.SetMag(encal) ;
647 rp->SetMomentum(dir.X(),dir.Y(),dir.Z(),encal) ;
648 rp->SetCalcMass(0);
649 rp->Name(); //If photon sets the particle pdg name to gamma
650 rp->SetProductionVertex(0,0,0,0);
651 rp->SetFirstMother(-1);
652 rp->SetLastMother(-1);
653 rp->SetFirstDaughter(-1);
654 rp->SetLastDaughter(-1);
655 rp->SetPolarisation(0,0,0);
656 //Set the position in global coordinate system from the RecPoint
657 AliPHOSGeometry * geom = gime->PHOSGeometry() ;
658 AliPHOSTrackSegment * ts = gime->TrackSegment(rp->GetPHOSTSIndex()) ;
659 AliPHOSEmcRecPoint * erp = gime->EmcRecPoint(ts->GetEmcIndex()) ;
660 TVector3 pos ;
661 geom->GetGlobal(erp, pos) ;
662 rp->SetPos(pos);
663
664 index++ ;
665 }
666}
667
668//____________________________________________________________________________
669void AliPHOSPIDv1::Print() const
670{
671 // Print the parameters used for the particle type identification
672
673 Info("Print", "=============== AliPHOSPIDv1 ================") ;
674 printf("Making PID\n") ;
675 printf(" Pricipal analysis file from 0.5 to 100 %s\n", fFileNamePrincipalPhoton.Data() ) ;
676 printf(" Name of parameters file %s\n", fFileNameParameters.Data() ) ;
677 printf(" Matrix of Parameters: 14x4\n") ;
678 printf(" Energy Calibration 1x3 [3 parametres to calibrate energy: A + B* E + C * E^2]\n") ;
679 printf(" RCPV 2x3 rows x and z, columns function cut parameters\n") ;
680 printf(" TOF 1x3 [High Eff-Low Pur,Medium Eff-Pur, Low Eff-High Pur]\n") ;
681 printf(" PCA 5x4 [5 ellipse parametres and 4 parametres to calculate them: A/Sqrt(E) + B* E + C * E^2 + D]\n") ;
682 Printf(" Pi0 PCA 5x3 [5 ellipse parametres and 3 parametres to calculate them: A + B* E + C * E^2]\n") ;
683 fParameters->Print() ;
684}
685
686
687
688//____________________________________________________________________________
689void AliPHOSPIDv1::PrintRecParticles(Option_t * option)
690{
691 // Print table of reconstructed particles
692
693 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
694
695 TClonesArray * recParticles = gime->RecParticles() ;
696
697 TString message ;
698 message = "\nevent " ;
699 message += gAlice->GetEvNumber() ;
700 message += " found " ;
701 message += recParticles->GetEntriesFast();
702 message += " RecParticles\n" ;
703
704 if(strstr(option,"all")) { // printing found TS
705 message += "\n PARTICLE Index \n" ;
706
707 Int_t index ;
708 for (index = 0 ; index < recParticles->GetEntries() ; index++) {
709 AliPHOSRecParticle * rp = (AliPHOSRecParticle * ) recParticles->At(index) ;
710 message += "\n" ;
711 message += rp->Name().Data() ;
712 message += " " ;
713 message += rp->GetIndexInList() ;
714 message += " " ;
715 message += rp->GetType() ;
716 }
717 }
718 Info("Print", message.Data() ) ;
719}
720
721//____________________________________________________________________________
722void AliPHOSPIDv1::SetParameters()
723{
724 // PCA : To do the Principal Components Analysis it is necessary
725 // the Principal file, which is opened here
726 fX = new double[7]; // Data for the PCA
727 fPPhoton = new double[7]; // Eigenvalues of the PCA
728 fPPi0 = new double[7]; // Eigenvalues of the Pi0 PCA
729
730 // Read photon principals from the photon file
731
732 fFileNamePrincipalPhoton = "$ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root" ;
733 TFile f( fFileNamePrincipalPhoton.Data(), "read" ) ;
734 fPrincipalPhoton = dynamic_cast<TPrincipal*> (f.Get("principal")) ;
735 f.Close() ;
736
737 // Read pi0 principals from the pi0 file
738
739 fFileNamePrincipalPi0 = "$ALICE_ROOT/PHOS/PCA_pi0_40-120.root" ;
740 TFile fPi0( fFileNamePrincipalPi0.Data(), "read" ) ;
741 fPrincipalPi0 = dynamic_cast<TPrincipal*> (fPi0.Get("principal")) ;
742 fPi0.Close() ;
743
744 // Open parameters file and initialization of the Parameters matrix.
745 // In the File Parameters.dat are all the parameters. These are introduced
746 // in a matrix of 16x4
747 //
748 // All the parameters defined in this file are, in order of row:
749 // line 0 : calibration
750 // lines 1,2 : CPV rectangular cat for X and Z
751 // line 3 : TOF cut
752 // lines 4-8 : parameters to calculate photon PCA ellipse
753 // lines 9-13: parameters to calculate pi0 PCA ellipse
754 // lines 14-15: parameters to calculate border for high-pt photons and pi0
755
756 fFileNameParameters = gSystem->ExpandPathName("$ALICE_ROOT/PHOS/Parameters.dat");
757 fParameters = new TMatrix(16,4) ;
758 const Int_t maxLeng=255;
759 char string[maxLeng];
760
761 // Open a text file with PID parameters
762 FILE *fd = fopen(fFileNameParameters.Data(),"r");
763 if (!fd)
764 Fatal("SetParameter","File %s with a PID parameters cannot be opened\n",
765 fFileNameParameters.Data());
766
767 Int_t i=0;
768 // Read parameter file line-by-line and skip empty line and comments
769 while (fgets(string,maxLeng,fd) != NULL) {
770 if (string[0] == '\n' ) continue;
771 if (string[0] == '!' ) continue;
772 sscanf(string, "%f %f %f %f",
773 &(*fParameters)(i,0), &(*fParameters)(i,1),
774 &(*fParameters)(i,2), &(*fParameters)(i,3));
775 i++;
776 //printf("line %d: %s",i,string);
777 }
778 fclose(fd);
779}
780
781//____________________________________________________________________________
782void AliPHOSPIDv1::SetParameterCalibration(Int_t i,Float_t param)
783{
784 // Set parameter "Calibration" i to a value param
785 if(i>2 || i<0)
786 Error("SetParameterCalibration","Invalid parameter number: %d",i);
787 else
788 (*fParameters)(0,i) = param ;
789}
790
791//____________________________________________________________________________
792void AliPHOSPIDv1::SetParameterCpv2Emc(Int_t i, TString axis, Float_t cut)
793{
794 // Set the parameters to calculate Cpv-to-Emc Distance Cut depending on
795 // Purity-Efficiency point i
796
797 if(i>2 || i<0)
798 Error("SetParameterCpv2Emc","Invalid parameter number: %d",i);
799 else {
800 axis.ToLower();
801 if (axis == "x") (*fParameters)(1,i) = cut;
802 else if (axis == "z") (*fParameters)(2,i) = cut;
803 else Error("SetParameterCpv2Emc","Invalid axis name: %s",axis.Data());
804 }
805}
806
807//____________________________________________________________________________
808void AliPHOSPIDv1::SetParameterPhotonBoundary(Int_t i,Float_t param)
809{
810 // Set parameter "Hard photon boundary" i to a value param
811 if(i>4 || i<0)
812 Error("SetParameterPhotonBoundary","Invalid parameter number: %d",i);
813 else
814 (*fParameters)(14,i) = param ;
815}
816
817//____________________________________________________________________________
818void AliPHOSPIDv1::SetParameterPi0Boundary(Int_t i,Float_t param)
819{
820 // Set parameter "Hard pi0 boundary" i to a value param
821 if(i>1 || i<0)
822 Error("SetParameterPi0Boundary","Invalid parameter number: %d",i);
823 else
824 (*fParameters)(15,i) = param ;
825}
826
827//_____________________________________________________________________________
828void AliPHOSPIDv1::SetParameterTimeGate(Int_t i, Float_t gate)
829{
830 // Set the parameter TimeGate depending on Purity-Efficiency point i
831 if (i>2 || i<0)
832 Error("SetParameterTimeGate","Invalid Efficiency-Purity choice %d",i);
833 else
834 (*fParameters)(3,i)= gate ;
835}
836
837//_____________________________________________________________________________
838void AliPHOSPIDv1::SetParameterToCalculateEllipse(TString particle, TString param, Int_t i, Float_t par)
839{
840 // Set the parameter "i" that is needed to calculate the ellipse
841 // parameter "param" for a particle "particle"
842
843 particle.ToLower();
844 param. ToLower();
845 Int_t p= -1;
846 Int_t offset=0;
847
848 if (particle == "photon") offset=0;
849 else if (particle == "pi0") offset=5;
850 else
851 Error("SetParameterToCalculateEllipse","Wrong particle name: %s (choose from pi0/photon)\n",particle.Data());
852
853 if (param.Contains("a")) p=4+offset;
854 else if(param.Contains("b")) p=5+offset;
855 else if(param.Contains("c")) p=6+offset;
856 else if(param.Contains("x0"))p=7+offset;
857 else if(param.Contains("y0"))p=8+offset;
858 if((i>4)||(i<0))
859 Error("SetEllipseParameter", "No parameter with index %d", i) ;
860 else if(p==-1)
861 Error("SetEllipseParameter", "No parameter with name %s", param.Data() ) ;
862 else
863 (*fParameters)(p,i) = par ;
864}
865
866//____________________________________________________________________________
867void AliPHOSPIDv1::Unload()
868{
869 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
870 gime->PhosLoader()->UnloadRecPoints() ;
871 gime->PhosLoader()->UnloadTracks() ;
872 gime->PhosLoader()->UnloadRecParticles() ;
873}
874
875//____________________________________________________________________________
876void AliPHOSPIDv1::WriteRecParticles()
877{
878
879 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
880
881 TClonesArray * recParticles = gime->RecParticles() ;
882 recParticles->Expand(recParticles->GetEntriesFast() ) ;
883 TTree * treeP = gime->TreeP();
884
885 //First rp
886 Int_t bufferSize = 32000 ;
887 TBranch * rpBranch = treeP->Branch("PHOSRP",&recParticles,bufferSize);
888 rpBranch->SetTitle(BranchName());
889
890 rpBranch->Fill() ;
891
892 gime->WriteRecParticles("OVERWRITE");
893 gime->WritePID("OVERWRITE");
894}
895