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 *
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 **************************************************************************/
18 /* History of cvs commits:
21 * Revision 1.113 2007/08/07 14:12:03 kharlov
22 * Quality assurance added (Yves Schutz)
24 * Revision 1.112 2007/07/11 13:43:30 hristov
25 * New class AliESDEvent, backward compatibility with the old AliESD (Christian)
27 * Revision 1.111 2007/05/04 14:49:29 policheh
28 * AliPHOSRecPoint inheritance from AliCluster
30 * Revision 1.110 2007/04/24 10:08:03 kharlov
31 * Vertex extraction from GenHeader
33 * Revision 1.109 2007/04/18 09:34:05 kharlov
36 * Revision 1.108 2007/04/16 09:03:37 kharlov
37 * Incedent angle correction fixed
39 * Revision 1.107 2007/04/02 15:00:16 cvetan
40 * No more calls to gAlice in the reconstruction
42 * Revision 1.106 2007/04/01 15:40:15 kharlov
43 * Correction for actual vertex position implemented
45 * Revision 1.105 2007/03/06 06:57:46 kharlov
46 * DP:calculation of distance to CPV done in TSM
48 * Revision 1.104 2006/12/15 10:46:26 hristov
49 * Using TMath::Abs instead of fabs
51 * Revision 1.103 2006/09/07 18:31:08 kharlov
52 * Effective c++ corrections (T.Pocheptsov)
54 * Revision 1.102 2006/01/23 17:51:48 hristov
55 * Using the recommended way of forward declarations for TVector and TMatrix (see v5-08-00 release notes). Additional clean-up
57 * Revision 1.101 2005/05/28 14:19:04 schutz
58 * Compilation warnings fixed by T.P.
62 //_________________________________________________________________________
63 // Implementation version v1 of the PHOS particle identifier
64 // Particle identification based on the
65 // - RCPV: distance from CPV recpoint to EMCA recpoint.
67 // - PCA: Principal Components Analysis..
68 // The identified particle has an identification number corresponding
69 // to a 9 bits number:
70 // -Bit 0 to 2: bit set if RCPV > CpvEmcDistance (each bit corresponds
71 // to a different efficiency-purity point of the photon identification)
72 // -Bit 3 to 5: bit set if TOF < TimeGate (each bit corresponds
73 // to a different efficiency-purity point of the photon identification)
74 // -Bit 6 to 9: bit set if Principal Components are
75 // inside an ellipse defined by the parameters a, b, c, x0 and y0.
76 // (each bit corresponds to a different efficiency-purity point of the
77 // photon identification)
78 // The PCA (Principal components analysis) needs a file that contains
79 // a previous analysis of the correlations between the particles. This
80 // file is $ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root. Analysis done for
81 // energies between 0.5 and 100 GeV.
82 // A calibrated energy is calculated. The energy of the reconstructed
83 // cluster is corrected with the formula A + B * E + C * E^2, whose
84 // parameters where obtained through the study of the reconstructed
85 // energy distribution of monoenergetic photons.
87 // All the parameters (RCPV(2 rows-3 columns),TOF(1r-3c),PCA(5r-4c)
88 // and calibration(1r-3c))are stored in a file called
89 // $ALICE_ROOT/PHOS/Parameters.dat. Each time that AliPHOSPIDv1 is
90 // initialized, this parameters are copied to a Matrix (9,4), a
94 // root [0] AliPHOSPIDv1 * p = new AliPHOSPIDv1("galice1.root")
95 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
96 // // reading headers from file galice1.root and create RecParticles
97 // TrackSegments and RecPoints are used
98 // // set file name for the branch RecParticles
99 // root [1] p->ExecuteTask("deb all time")
100 // // available options
101 // // "deb" - prints # of reconstructed particles
102 // // "deb all" - prints # and list of RecParticles
103 // // "time" - prints benchmarking results
105 // root [2] AliPHOSPIDv1 * p2 = new AliPHOSPIDv1("galice1.root","v1",kTRUE)
106 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
108 // root [3] p2->ExecuteTask()
112 //*-- Author: Yves Schutz (SUBATECH) & Gines Martinez (SUBATECH) &
113 // Gustavo Conesa April 2002
114 // PCA redesigned by Gustavo Conesa October 2002:
115 // The way of using the PCA has changed. Instead of 2
116 // files with the PCA, each one with different energy ranges
117 // of application, we use the wide one (0.5-100 GeV), and instead
118 // of fixing 3 ellipses for different ranges of energy, it has been
119 // studied the dependency of the ellipses parameters with the
120 // energy, and they are implemented in the code as a funtion
125 // --- ROOT system ---
128 // --- Standard library ---
129 #include <TMatrixF.h>
130 #include "TFormula.h"
131 #include "TBenchmark.h"
132 #include "TPrincipal.h"
136 // --- AliRoot header files ---
137 //#include "AliLog.h"
139 #include "AliPHOSPIDv1.h"
140 #include "AliESDEvent.h"
141 #include "AliESDVertex.h"
142 #include "AliPHOSTrackSegment.h"
143 #include "AliPHOSEmcRecPoint.h"
144 #include "AliPHOSRecParticle.h"
146 ClassImp( AliPHOSPIDv1)
148 //____________________________________________________________________________
149 AliPHOSPIDv1::AliPHOSPIDv1() :
152 fDefaultInit(kFALSE),
154 fFileNamePrincipalPhoton(),
155 fFileNamePrincipalPi0(),
156 fFileNameParameters(),
172 fChargedNeutralThreshold(0.),
175 fDispMultThreshold(0)
180 fDefaultInit = kTRUE ;
183 //____________________________________________________________________________
184 AliPHOSPIDv1::AliPHOSPIDv1(const AliPHOSPIDv1 & pid ) :
187 fDefaultInit(kFALSE),
189 fFileNamePrincipalPhoton(),
190 fFileNamePrincipalPi0(),
191 fFileNameParameters(),
207 fChargedNeutralThreshold(0.),
210 fDispMultThreshold(0)
218 //____________________________________________________________________________
219 AliPHOSPIDv1::AliPHOSPIDv1(AliPHOSGeometry *geom):
222 fDefaultInit(kFALSE),
224 fFileNamePrincipalPhoton(),
225 fFileNamePrincipalPi0(),
226 fFileNameParameters(),
242 fChargedNeutralThreshold(0.),
245 fDispMultThreshold(0)
248 //ctor with the indication on where to look for the track segments
251 fDefaultInit = kFALSE ;
254 //____________________________________________________________________________
255 AliPHOSPIDv1::~AliPHOSPIDv1()
258 fPrincipalPhoton = 0;
261 delete [] fX ; // Principal input
262 delete [] fPPhoton ; // Photon Principal components
263 delete [] fPPi0 ; // Pi0 Principal components
275 //____________________________________________________________________________
276 void AliPHOSPIDv1::InitParameters()
278 // Initialize PID parameters
281 SetParameters() ; // fill the parameters matrix from parameters file
283 // initialisation of response function parameters
287 // fTphoton[0] = 0.218 ;
288 // fTphoton[1] = 1.55E-8 ;
289 // fTphoton[2] = 5.05E-10 ;
290 // fTFphoton = new TFormula("ToF response to photons" , "gaus") ;
291 // fTFphoton->SetParameters( fTphoton[0], fTphoton[1], fTphoton[2]) ;
294 // //Gaus (0 to max probability)
295 // fTpiong[0] = 0.0971 ;
296 // fTpiong[1] = 1.58E-8 ;
297 // fTpiong[2] = 5.69E-10 ;
298 // fTFpiong = new TFormula("ToF response to pions" , "gaus") ;
299 // fTFpiong->SetParameters( fTpiong[0], fTpiong[1], fTpiong[2]) ;
302 // //Gaus (0 to max probability)
303 // fTkaong[0] = 0.0542 ;
304 // fTkaong[1] = 1.64E-8 ;
305 // fTkaong[2] = 6.07E-10 ;
306 // fTFkaong = new TFormula("ToF response to kaon" , "gaus") ;
307 // fTFkaong->SetParameters( fTkaong[0], fTkaong[1], fTkaong[2]) ;
308 // //Landau (max probability to inf)
309 // fTkaonl[0] = 0.264 ;
310 // fTkaonl[1] = 1.68E-8 ;
311 // fTkaonl[2] = 4.10E-10 ;
312 // fTFkaonl = new TFormula("ToF response to kaon" , "landau") ;
313 // fTFkaonl->SetParameters( fTkaonl[0], fTkaonl[1], fTkaonl[2]) ;
316 // //Gaus (0 to max probability)
317 // fThhadrong[0] = 0.0302 ;
318 // fThhadrong[1] = 1.73E-8 ;
319 // fThhadrong[2] = 9.52E-10 ;
320 // fTFhhadrong = new TFormula("ToF response to heavy hadrons" , "gaus") ;
321 // fTFhhadrong->SetParameters( fThhadrong[0], fThhadrong[1], fThhadrong[2]) ;
322 // //Landau (max probability to inf)
323 // fThhadronl[0] = 0.139 ;
324 // fThhadronl[1] = 1.745E-8 ;
325 // fThhadronl[2] = 1.00E-9 ;
326 // fTFhhadronl = new TFormula("ToF response to heavy hadrons" , "landau") ;
327 // fTFhhadronl->SetParameters( fThhadronl[0], fThhadronl[1], fThhadronl[2]) ;
330 fTphoton[0] = 7.83E8 ;
331 fTphoton[1] = 1.55E-8 ;
332 fTphoton[2] = 5.09E-10 ;
333 fTFphoton = new TFormula("ToF response to photons" , "gaus") ;
334 fTFphoton->SetParameters( fTphoton[0], fTphoton[1], fTphoton[2]) ;
337 //Gaus (0 to max probability)
338 fTpiong[0] = 6.73E8 ;
339 fTpiong[1] = 1.58E-8 ;
340 fTpiong[2] = 5.87E-10 ;
341 fTFpiong = new TFormula("ToF response to pions" , "gaus") ;
342 fTFpiong->SetParameters( fTpiong[0], fTpiong[1], fTpiong[2]) ;
345 //Gaus (0 to max probability)
346 fTkaong[0] = 3.93E8 ;
347 fTkaong[1] = 1.64E-8 ;
348 fTkaong[2] = 6.07E-10 ;
349 fTFkaong = new TFormula("ToF response to kaon" , "gaus") ;
350 fTFkaong->SetParameters( fTkaong[0], fTkaong[1], fTkaong[2]) ;
351 //Landau (max probability to inf)
353 fTkaonl[1] = 1.68E-8 ;
354 fTkaonl[2] = 4.10E-10 ;
355 fTFkaonl = new TFormula("ToF response to kaon" , "landau") ;
356 fTFkaonl->SetParameters( fTkaonl[0], fTkaonl[1], fTkaonl[2]) ;
359 //Gaus (0 to max probability)
360 fThhadrong[0] = 2.02E8 ;
361 fThhadrong[1] = 1.73E-8 ;
362 fThhadrong[2] = 9.52E-10 ;
363 fTFhhadrong = new TFormula("ToF response to heavy hadrons" , "gaus") ;
364 fTFhhadrong->SetParameters( fThhadrong[0], fThhadrong[1], fThhadrong[2]) ;
365 //Landau (max probability to inf)
366 fThhadronl[0] = 1.10E9 ;
367 fThhadronl[1] = 1.74E-8 ;
368 fThhadronl[2] = 1.00E-9 ;
369 fTFhhadronl = new TFormula("ToF response to heavy hadrons" , "landau") ;
370 fTFhhadronl->SetParameters( fThhadronl[0], fThhadronl[1], fThhadronl[2]) ;
374 // Shower shape: dispersion gaussian parameters
377 // fDphoton[0] = 4.62e-2; fDphoton[1] = 1.39e-2 ; fDphoton[2] = -3.80e-2;//constant
378 // fDphoton[3] = 1.53 ; fDphoton[4] =-6.62e-2 ; fDphoton[5] = 0.339 ;//mean
379 // fDphoton[6] = 6.89e-2; fDphoton[7] =-6.59e-2 ; fDphoton[8] = 0.194 ;//sigma
381 // fDpi0[0] = 0.0586 ; fDpi0[1] = 1.06E-3 ; fDpi0[2] = 0. ;//constant
382 // fDpi0[3] = 2.67 ; fDpi0[4] =-2.00E-2 ; fDpi0[5] = 9.37E-5 ;//mean
383 // fDpi0[6] = 0.153 ; fDpi0[7] = 9.34E-4 ; fDpi0[8] =-1.49E-5 ;//sigma
385 // fDhadron[0] = 1.61E-2 ; fDhadron[1] = 3.03E-3 ; fDhadron[2] = 1.01E-2 ;//constant
386 // fDhadron[3] = 3.81 ; fDhadron[4] = 0.232 ; fDhadron[5] =-1.25 ;//mean
387 // fDhadron[6] = 0.897 ; fDhadron[7] = 0.0987 ; fDhadron[8] =-0.534 ;//sigma
389 fDphoton[0] = 1.5 ; fDphoton[1] = 0.49 ; fDphoton[2] =-1.7E-2 ;//constant
390 fDphoton[3] = 1.5 ; fDphoton[4] = 4.0E-2 ; fDphoton[5] = 0.21 ;//mean
391 fDphoton[6] = 4.8E-2 ; fDphoton[7] =-0.12 ; fDphoton[8] = 0.27 ;//sigma
392 fDphoton[9] = 16.; //for E> fDphoton[9] parameters calculated at fDphoton[9]
394 fDpi0[0] = 0.25 ; fDpi0[1] = 3.3E-2 ; fDpi0[2] =-1.0e-5 ;//constant
395 fDpi0[3] = 1.50 ; fDpi0[4] = 398. ; fDpi0[5] = 12. ;//mean
396 fDpi0[6] =-7.0E-2 ; fDpi0[7] =-524. ; fDpi0[8] = 22. ;//sigma
397 fDpi0[9] = 110.; //for E> fDpi0[9] parameters calculated at fDpi0[9]
399 fDhadron[0] = 6.5 ; fDhadron[1] =-5.3 ; fDhadron[2] = 1.5 ;//constant
400 fDhadron[3] = 3.8 ; fDhadron[4] = 0.23 ; fDhadron[5] =-1.2 ;//mean
401 fDhadron[6] = 0.88 ; fDhadron[7] = 9.3E-2 ; fDhadron[8] =-0.51 ;//sigma
402 fDhadron[9] = 2.; //for E> fDhadron[9] parameters calculated at fDhadron[9]
407 fDFmuon = new TFormula("Shower shape response to muons" , "landau") ;
408 fDFmuon->SetParameters( fDmuon[0], fDmuon[1], fDmuon[2]) ;
411 // x(CPV-EMC) distance gaussian parameters
413 // fXelectron[0] = 8.06e-2 ; fXelectron[1] = 1.00e-2; fXelectron[2] =-5.14e-2;//constant
414 // fXelectron[3] = 0.202 ; fXelectron[4] = 8.15e-3; fXelectron[5] = 4.55 ;//mean
415 // fXelectron[6] = 0.334 ; fXelectron[7] = 0.186 ; fXelectron[8] = 4.32e-2;//sigma
417 // //charged hadrons gaus
418 // fXcharged[0] = 6.43e-3 ; fXcharged[1] =-4.19e-5; fXcharged[2] = 1.42e-3;//constant
419 // fXcharged[3] = 2.75 ; fXcharged[4] =-0.40 ; fXcharged[5] = 1.68 ;//mean
420 // fXcharged[6] = 3.135 ; fXcharged[7] =-9.41e-2; fXcharged[8] = 1.31e-2;//sigma
422 // // z(CPV-EMC) distance gaussian parameters
424 // fZelectron[0] = 8.22e-2 ; fZelectron[1] = 5.11e-3; fZelectron[2] =-3.05e-2;//constant
425 // fZelectron[3] = 3.09e-2 ; fZelectron[4] = 5.87e-2; fZelectron[5] =-9.49e-2;//mean
426 // fZelectron[6] = 0.263 ; fZelectron[7] =-9.02e-3; fZelectron[8] = 0.151 ;//sigma
428 // //charged hadrons gaus
430 // fZcharged[0] = 1.00e-2 ; fZcharged[1] = 2.82E-4 ; fZcharged[2] = 2.87E-3 ;//constant
431 // fZcharged[3] =-4.68e-2 ; fZcharged[4] =-9.21e-3 ; fZcharged[5] = 4.91e-2 ;//mean
432 // fZcharged[6] = 1.425 ; fZcharged[7] =-5.90e-2 ; fZcharged[8] = 5.07e-2 ;//sigma
435 fXelectron[0] =-1.6E-2 ; fXelectron[1] = 0.77 ; fXelectron[2] =-0.15 ;//constant
436 fXelectron[3] = 0.35 ; fXelectron[4] = 0.25 ; fXelectron[5] = 4.12 ;//mean
437 fXelectron[6] = 0.30 ; fXelectron[7] = 0.11 ; fXelectron[8] = 0.16 ;//sigma
438 fXelectron[9] = 3.; //for E> fXelectron[9] parameters calculated at fXelectron[9]
440 //charged hadrons gaus
441 fXcharged[0] = 0.14 ; fXcharged[1] =-3.0E-2 ; fXcharged[2] = 0 ;//constant
442 fXcharged[3] = 1.4 ; fXcharged[4] =-9.3E-2 ; fXcharged[5] = 1.4 ;//mean
443 fXcharged[6] = 5.7 ; fXcharged[7] = 0.27 ; fXcharged[8] =-1.8 ;//sigma
444 fXcharged[9] = 1.2; //for E> fXcharged[9] parameters calculated at fXcharged[9]
446 // z(CPV-EMC) distance gaussian parameters
448 fZelectron[0] = 0.49 ; fZelectron[1] = 0.53 ; fZelectron[2] =-9.8E-2 ;//constant
449 fZelectron[3] = 2.8E-2 ; fZelectron[4] = 5.0E-2 ; fZelectron[5] =-8.2E-2 ;//mean
450 fZelectron[6] = 0.25 ; fZelectron[7] =-1.7E-2 ; fZelectron[8] = 0.17 ;//sigma
451 fZelectron[9] = 3.; //for E> fZelectron[9] parameters calculated at fZelectron[9]
453 //charged hadrons gaus
455 fZcharged[0] = 0.46 ; fZcharged[1] =-0.65 ; fZcharged[2] = 0.52 ;//constant
456 fZcharged[3] = 1.1E-2 ; fZcharged[4] = 0. ; fZcharged[5] = 0. ;//mean
457 fZcharged[6] = 0.60 ; fZcharged[7] =-8.2E-2 ; fZcharged[8] = 0.45 ;//sigma
458 fZcharged[9] = 1.2; //for E> fXcharged[9] parameters calculated at fXcharged[9]
460 //Threshold to differentiate between charged and neutral
461 fChargedNeutralThreshold = 1e-5;
462 fTOFEnThreshold = 2; //Maximum energy to use TOF
463 fDispEnThreshold = 0.5; //Minimum energy to use shower shape
464 fDispMultThreshold = 3; //Minimum multiplicity to use shower shape
466 //Weight to hadrons recontructed energy
468 fERecWeightPar[0] = 0.32 ;
469 fERecWeightPar[1] = 3.8 ;
470 fERecWeightPar[2] = 5.4E-3 ;
471 fERecWeightPar[3] = 5.6E-2 ;
472 fERecWeight = new TFormula("Weight for hadrons" , "[0]*exp(-x*[1])+[2]*exp(-x*[3])") ;
473 fERecWeight ->SetParameters(fERecWeightPar[0],fERecWeightPar[1] ,fERecWeightPar[2] ,fERecWeightPar[3]) ;
476 for (Int_t i =0; i< AliPID::kSPECIESN ; i++)
481 //________________________________________________________________________
482 void AliPHOSPIDv1::TrackSegments2RecParticles(Option_t *option)
484 // Steering method to perform particle reconstruction and identification
485 // for the event range from fFirstEvent to fLastEvent.
487 if(strstr(option,"tim"))
488 gBenchmark->Start("PHOSPID");
490 if(strstr(option,"print")) {
495 if(fTrackSegments && //Skip events, where no track segments made
496 fTrackSegments->GetEntriesFast()) {
504 if(strstr(option,"deb"))
505 PrintRecParticles(option) ;
508 if(strstr(option,"deb"))
509 PrintRecParticles(option);
510 if(strstr(option,"tim")){
511 gBenchmark->Stop("PHOSPID");
512 AliInfo(Form("took %f seconds for PID",
513 gBenchmark->GetCpuTime("PHOSPID")));
517 //________________________________________________________________________
518 Double_t AliPHOSPIDv1::GausF(Double_t x, Double_t y, Double_t * par)
520 //Given the energy x and the parameter y (tof, shower dispersion or cpv-emc distance),
521 //this method returns a density probability of this parameter, given by a gaussian
522 //function whose parameters depend with the energy with a function: a/(x*x)+b/x+b
524 if (x > par[9]) x = par[9];
526 //Double_t cnt = par[1] / (x*x) + par[2] / x + par[0] ;
527 Double_t cnt = par[0] + par[1] * x + par[2] * x * x ;
528 Double_t mean = par[4] / (x*x) + par[5] / x + par[3] ;
529 Double_t sigma = par[7] / (x*x) + par[8] / x + par[6] ;
532 // cout<<"En_in = "<<xorg<<"; En_out = "<<x<<"; cnt = "<<cnt
533 // <<"; mean = "<<mean<<"; sigma = "<<sigma<<endl;
535 // Double_t arg = - (y-mean) * (y-mean) / (2*sigma*sigma) ;
536 // return cnt * TMath::Exp(arg) ;
537 if(TMath::Abs(sigma) > 1.e-10){
538 return cnt*TMath::Gaus(y,mean,sigma);
544 //________________________________________________________________________
545 Double_t AliPHOSPIDv1::GausPol2(Double_t x, Double_t y, Double_t * par)
547 //Given the energy x and the parameter y (tof, shower dispersion or cpv-emc distance),
548 //this method returns a density probability of this parameter, given by a gaussian
549 //function whose parameters depend with the energy like second order polinomial
551 Double_t cnt = par[0] + par[1] * x + par[2] * x * x ;
552 Double_t mean = par[3] + par[4] * x + par[5] * x * x ;
553 Double_t sigma = par[6] + par[7] * x + par[8] * x * x ;
555 if(TMath::Abs(sigma) > 1.e-10){
556 return cnt*TMath::Gaus(y,mean,sigma);
565 //____________________________________________________________________________
566 const TString AliPHOSPIDv1::GetFileNamePrincipal(TString particle) const
568 //Get file name that contains the PCA for a particle ("photon or pi0")
571 if (particle=="photon")
572 name = fFileNamePrincipalPhoton ;
573 else if (particle=="pi0" )
574 name = fFileNamePrincipalPi0 ;
576 AliError(Form("Wrong particle name: %s (choose from pi0/photon)\n",
581 //____________________________________________________________________________
582 Float_t AliPHOSPIDv1::GetParameterCalibration(Int_t i) const
584 // Get the i-th parameter "Calibration"
587 AliError(Form("Invalid parameter number: %d",i));
589 param = (*fParameters)(0,i);
593 //____________________________________________________________________________
594 Float_t AliPHOSPIDv1::GetCalibratedEnergy(Float_t e) const
596 // It calibrates Energy depending on the recpoint energy.
597 // The energy of the reconstructed cluster is corrected with
598 // the formula A + B* E + C* E^2, whose parameters where obtained
599 // through the study of the reconstructed energy distribution of
600 // monoenergetic photons.
602 if(!fEnergyCorrectionOn) return e;
604 Float_t p[]={0.,0.,0.};
605 for (Int_t i=0; i<3; i++) p[i] = GetParameterCalibration(i);
606 Float_t enerec = p[0] + p[1]*e + p[2]*e*e;
611 //____________________________________________________________________________
612 Float_t AliPHOSPIDv1::GetParameterCpv2Emc(Int_t i, TString axis) const
614 // Get the i-th parameter "CPV-EMC distance" for the specified axis
617 AliError(Form("Invalid parameter number: %d",i));
621 param = (*fParameters)(1,i);
622 else if (axis == "z")
623 param = (*fParameters)(2,i);
625 AliError(Form("Invalid axis name: %s",axis.Data()));
631 //____________________________________________________________________________
632 Float_t AliPHOSPIDv1::GetCpv2EmcDistanceCut(TString axis, Float_t e) const
634 // Get CpvtoEmcDistance Cut depending on the cluster energy, axis and
635 // Purity-Efficiency point
638 Float_t p[]={0.,0.,0.};
639 for (Int_t i=0; i<3; i++) p[i] = GetParameterCpv2Emc(i,axis);
640 Float_t sig = p[0] + TMath::Exp(p[1] - p[2]*e);
644 //____________________________________________________________________________
645 Float_t AliPHOSPIDv1::GetEllipseParameter(TString particle, TString param, Float_t e) const
647 // Calculates the parameter param of the ellipse
651 Float_t p[4]={0.,0.,0.,0.};
653 for (Int_t i=0; i<4; i++) p[i] = GetParameterToCalculateEllipse(particle,param,i);
654 if (particle == "photon") {
655 if (param.Contains("a")) e = TMath::Min((Double_t)e,70.);
656 else if (param.Contains("b")) e = TMath::Min((Double_t)e,70.);
657 else if (param.Contains("x0")) e = TMath::Max((Double_t)e,1.1);
660 if (particle == "photon")
661 value = p[0]/TMath::Sqrt(e) + p[1]*e + p[2]*e*e + p[3];
662 else if (particle == "pi0")
663 value = p[0] + p[1]*e + p[2]*e*e;
668 //_____________________________________________________________________________
669 Float_t AliPHOSPIDv1::GetParameterPhotonBoundary (Int_t i) const
671 // Get the parameter "i" to calculate the boundary on the moment M2x
672 // for photons at high p_T
675 AliError(Form("Wrong parameter number: %d\n",i));
677 param = (*fParameters)(14,i) ;
681 //____________________________________________________________________________
682 Float_t AliPHOSPIDv1::GetParameterPi0Boundary (Int_t i) const
684 // Get the parameter "i" to calculate the boundary on the moment M2x
685 // for pi0 at high p_T
688 AliError(Form("Wrong parameter number: %d\n",i));
690 param = (*fParameters)(15,i) ;
694 //____________________________________________________________________________
695 Float_t AliPHOSPIDv1::GetParameterTimeGate(Int_t i) const
697 // Get TimeGate parameter depending on Purity-Efficiency i:
698 // i=0 - Low purity, i=1 - Medium purity, i=2 - High purity
701 AliError(Form("Invalid Efficiency-Purity choice %d",i));
703 param = (*fParameters)(3,i) ;
707 //_____________________________________________________________________________
708 Float_t AliPHOSPIDv1::GetParameterToCalculateEllipse(TString particle, TString param, Int_t i) const
710 // Get the parameter "i" that is needed to calculate the ellipse
711 // parameter "param" for the particle "particle" ("photon" or "pi0")
716 if (particle == "photon")
718 else if (particle == "pi0")
721 AliError(Form("Wrong particle name: %s (choose from pi0/photon)\n",
727 if (param.Contains("a")) p=4+offset;
728 else if(param.Contains("b")) p=5+offset;
729 else if(param.Contains("c")) p=6+offset;
730 else if(param.Contains("x0"))p=7+offset;
731 else if(param.Contains("y0"))p=8+offset;
734 AliError(Form("No parameter with index %d", i)) ;
736 AliError(Form("No parameter with name %s", param.Data() )) ;
738 par = (*fParameters)(p,i) ;
744 //DP____________________________________________________________________________
745 //Float_t AliPHOSPIDv1::GetDistance(AliPHOSEmcRecPoint * emc,AliPHOSCpvRecPoint * cpv, Option_t * axis)const
747 // // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
749 // AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance();
753 // emc->GetLocalPosition(vecEmc) ;
754 // cpv->GetLocalPosition(vecCpv) ;
756 // if(emc->GetPHOSMod() == cpv->GetPHOSMod()){
757 // // Correct to difference in CPV and EMC position due to different distance to center.
758 // // we assume, that particle moves from center
759 // Float_t dCPV = geom->GetIPtoOuterCoverDistance();
760 // Float_t dEMC = geom->GetIPtoCrystalSurface() ;
761 // dEMC = dEMC / dCPV ;
762 // vecCpv = dEMC * vecCpv - vecEmc ;
763 // if (axis == "X") return vecCpv.X();
764 // if (axis == "Y") return vecCpv.Y();
765 // if (axis == "Z") return vecCpv.Z();
766 // if (axis == "R") return vecCpv.Mag();
768 // return 100000000 ;
770 // return 100000000 ;
772 //____________________________________________________________________________
773 Int_t AliPHOSPIDv1::GetCPVBit(AliPHOSTrackSegment * ts, Int_t effPur, Float_t e) const
775 //Calculates the pid bit for the CPV selection per each purity.
776 if(effPur>2 || effPur<0)
777 AliError(Form("Invalid Efficiency-Purity choice %d",effPur));
779 //DP if(ts->GetCpvIndex()<0)
780 //DP return 1 ; //no CPV cluster
782 Float_t sigX = GetCpv2EmcDistanceCut("X",e);
783 Float_t sigZ = GetCpv2EmcDistanceCut("Z",e);
785 Float_t deltaX = TMath::Abs(ts->GetCpvDistance("X"));
786 Float_t deltaZ = TMath::Abs(ts->GetCpvDistance("Z"));
787 // Info("GetCPVBit"," xdist %f, sigx %f, zdist %f, sigz %f",deltaX, sigX, deltaZ,sigZ) ;
789 //if(deltaX>sigX*(effPur+1))
790 //if((deltaX>sigX*(effPur+1)) || (deltaZ>sigZ*(effPur+1)))
791 if((deltaX>sigX*(effPur+1)) && (deltaZ>sigZ*(effPur+1)))
797 //____________________________________________________________________________
798 Int_t AliPHOSPIDv1::GetPrincipalBit(TString particle, const Double_t* p, Int_t effPur, Float_t e)const
800 //Is the particle inside de PCA ellipse?
804 Float_t a = GetEllipseParameter(particle,"a" , e);
805 Float_t b = GetEllipseParameter(particle,"b" , e);
806 Float_t c = GetEllipseParameter(particle,"c" , e);
807 Float_t x0 = GetEllipseParameter(particle,"x0", e);
808 Float_t y0 = GetEllipseParameter(particle,"y0", e);
810 Float_t r = TMath::Power((p[0] - x0)/a,2) +
811 TMath::Power((p[1] - y0)/b,2) +
812 c*(p[0] - x0)*(p[1] - y0)/(a*b) ;
813 //3 different ellipses defined
814 if((effPur==2) && (r<1./2.)) prinbit= 1;
815 if((effPur==1) && (r<2. )) prinbit= 1;
816 if((effPur==0) && (r<9./2.)) prinbit= 1;
819 AliError("Negative square?") ;
824 //____________________________________________________________________________
825 Int_t AliPHOSPIDv1::GetHardPhotonBit(AliPHOSEmcRecPoint * emc) const
827 // Set bit for identified hard photons (E > 30 GeV)
828 // if the second moment M2x is below the boundary
830 Float_t e = emc->GetEnergy();
831 if (e < 30.0) return 0;
832 Float_t m2x = emc->GetM2x();
833 Float_t m2xBoundary = GetParameterPhotonBoundary(0) *
834 TMath::Exp(-TMath::Power(e-GetParameterPhotonBoundary(1),2)/2.0/
835 TMath::Power(GetParameterPhotonBoundary(2),2)) +
836 GetParameterPhotonBoundary(3);
837 AliDebug(1, Form("E=%f, m2x=%f, boundary=%f", e,m2x,m2xBoundary));
838 if (m2x < m2xBoundary)
839 return 1;// A hard photon
841 return 0;// Not a hard photon
844 //____________________________________________________________________________
845 Int_t AliPHOSPIDv1::GetHardPi0Bit(AliPHOSEmcRecPoint * emc) const
847 // Set bit for identified hard pi0 (E > 30 GeV)
848 // if the second moment M2x is above the boundary
850 Float_t e = emc->GetEnergy();
851 if (e < 30.0) return 0;
852 Float_t m2x = emc->GetM2x();
853 Float_t m2xBoundary = GetParameterPi0Boundary(0) +
854 e * GetParameterPi0Boundary(1);
855 AliDebug(1,Form("E=%f, m2x=%f, boundary=%f",e,m2x,m2xBoundary));
856 if (m2x > m2xBoundary)
857 return 1;// A hard pi0
859 return 0;// Not a hard pi0
862 //____________________________________________________________________________
863 TVector3 AliPHOSPIDv1::GetMomentumDirection(AliPHOSEmcRecPoint * emc, AliPHOSCpvRecPoint * )const
865 // Calculates the momentum direction:
866 // 1. if only a EMC RecPoint, direction is given by IP and this RecPoint
867 // 2. if a EMC RecPoint and CPV RecPoint, direction is given by the line through the 2 recpoints
868 // However because of the poor position resolution of PPSD the direction is always taken as if we were
872 emc->GetLocalPosition(local) ;
874 AliPHOSGeometry * phosgeom = AliPHOSGeometry::GetInstance() ;
875 //Correct for the non-perpendicular incidence
876 // Correction for the depth of the shower starting point (TDR p 127)
877 Float_t para = 0.925 ;
878 Float_t parb = 6.52 ;
880 //Remove Old correction (vertex at 0,0,0)
881 TVector3 vtxOld(0.,0.,0.) ;
883 Float_t x=local.X() ;
884 Float_t z=local.Z() ;
885 phosgeom->GetIncidentVector(vtxOld,emc->GetPHOSMod(),x,z,vInc) ;
886 Float_t depthxOld = 0.;
887 Float_t depthzOld = 0.;
888 Float_t energy = emc->GetEnergy() ;
889 if (energy > 0 && vInc.Y()!=0.) {
890 depthxOld = ( para * TMath::Log(energy) + parb ) * vInc.X()/TMath::Abs(vInc.Y()) ;
891 depthzOld = ( para * TMath::Log(energy) + parb ) * vInc.Z()/TMath::Abs(vInc.Y()) ;
894 AliError("Cluster with zero energy \n");
897 phosgeom->GetIncidentVector(fVtx,emc->GetPHOSMod(),x,z,vInc) ;
900 if (energy > 0 && vInc.Y()!=0.) {
901 depthx = ( para * TMath::Log(energy) + parb ) * vInc.X()/TMath::Abs(vInc.Y()) ;
902 depthz = ( para * TMath::Log(energy) + parb ) * vInc.Z()/TMath::Abs(vInc.Y()) ;
905 //Correct for the vertex position and shower depth
906 Double_t xd=x+(depthxOld-depthx) ;
907 Double_t zd=z+(depthzOld-depthz) ;
908 TVector3 dir(0,0,0) ;
909 phosgeom->Local2Global(emc->GetPHOSMod(),xd,zd,dir) ;
917 //________________________________________________________________________
918 Double_t AliPHOSPIDv1::LandauF(Double_t x, Double_t y, Double_t * par)
920 //Given the energy x and the parameter y (tof, shower dispersion or cpv-emc distance),
921 //this method returns a density probability of this parameter, given by a landau
922 //function whose parameters depend with the energy with a function: a/(x*x)+b/x+b
924 if (x > par[9]) x = par[9];
926 //Double_t cnt = par[1] / (x*x) + par[2] / x + par[0] ;
927 Double_t cnt = par[0] + par[1] * x + par[2] * x * x ;
928 Double_t mean = par[4] / (x*x) + par[5] / x + par[3] ;
929 Double_t sigma = par[7] / (x*x) + par[8] / x + par[6] ;
931 if(TMath::Abs(sigma) > 1.e-10){
932 return cnt*TMath::Landau(y,mean,sigma);
938 //________________________________________________________________________
939 Double_t AliPHOSPIDv1::LandauPol2(Double_t x, Double_t y, Double_t * par)
942 //Given the energy x and the parameter y (tof, shower dispersion or cpv-emc distance),
943 //this method returns a density probability of this parameter, given by a landau
944 //function whose parameters depend with the energy like second order polinomial
946 Double_t cnt = par[2] * (x*x) + par[1] * x + par[0] ;
947 Double_t mean = par[5] * (x*x) + par[4] * x + par[3] ;
948 Double_t sigma = par[8] * (x*x) + par[7] * x + par[6] ;
950 if(TMath::Abs(sigma) > 1.e-10){
951 return cnt*TMath::Landau(y,mean,sigma);
958 // //________________________________________________________________________
959 // Double_t AliPHOSPIDv1::ChargedHadronDistProb(Double_t x, Double_t y, Double_t * parg, Double_t * parl)
961 // Double_t cnt = 0.0 ;
962 // Double_t mean = 0.0 ;
963 // Double_t sigma = 0.0 ;
964 // Double_t arg = 0.0 ;
965 // if (y < parl[4] / (x*x) + parl[5] / x + parl[3]){
966 // cnt = parg[1] / (x*x) + parg[2] / x + parg[0] ;
967 // mean = parg[4] / (x*x) + parg[5] / x + parg[3] ;
968 // sigma = parg[7] / (x*x) + parg[8] / x + parg[6] ;
969 // TF1 * f = new TF1("gaus","gaus",0.,100.);
970 // f->SetParameters(cnt,mean,sigma);
971 // arg = f->Eval(y) ;
974 // cnt = parl[1] / (x*x) + parl[2] / x + parl[0] ;
975 // mean = parl[4] / (x*x) + parl[5] / x + parl[3] ;
976 // sigma = parl[7] / (x*x) + parl[8] / x + parl[6] ;
977 // TF1 * f = new TF1("landau","landau",0.,100.);
978 // f->SetParameters(cnt,mean,sigma);
979 // arg = f->Eval(y) ;
981 // // Double_t mean = par[3] + par[4] * x + par[5] * x * x ;
982 // // Double_t sigma = par[6] + par[7] * x + par[8] * x * x ;
984 // //Double_t arg = -(y-mean)*(y-mean)/(2*sigma*sigma) ;
985 // //return cnt * TMath::Exp(arg) ;
990 //____________________________________________________________________________
991 void AliPHOSPIDv1::MakePID()
993 // construct the PID weight from a Bayesian Method
995 const Int_t kSPECIES = AliPID::kSPECIESN ;
997 Int_t nparticles = fRecParticles->GetEntriesFast() ;
999 if ( !fEMCRecPoints || !fCPVRecPoints || !fTrackSegments ) {
1000 AliFatal("RecPoints or TrackSegments not found !") ;
1003 TIter next(fTrackSegments) ;
1004 AliPHOSTrackSegment * ts ;
1007 Double_t * stof[kSPECIES] ;
1008 Double_t * sdp [kSPECIES] ;
1009 Double_t * scpv[kSPECIES] ;
1010 Double_t * sw [kSPECIES] ;
1011 //Info("MakePID","Begin MakePID");
1013 for (Int_t i =0; i< kSPECIES; i++){
1014 stof[i] = new Double_t[nparticles] ;
1015 sdp [i] = new Double_t[nparticles] ;
1016 scpv[i] = new Double_t[nparticles] ;
1017 sw [i] = new Double_t[nparticles] ;
1021 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
1023 //cout<<">>>>>> Bayesian Index "<<index<<endl;
1025 AliPHOSEmcRecPoint * emc = 0 ;
1026 if(ts->GetEmcIndex()>=0)
1027 emc = (AliPHOSEmcRecPoint *) fEMCRecPoints->At(ts->GetEmcIndex()) ;
1029 // AliPHOSCpvRecPoint * cpv = 0 ;
1030 // if(ts->GetCpvIndex()>=0)
1031 // cpv = (AliPHOSCpvRecPoint *) cpvRecPoints->At(ts->GetCpvIndex()) ;
1033 //// Int_t track = 0 ;
1034 //// track = ts->GetTrackIndex() ; //TPC tracks ?
1037 AliFatal(Form("-> emc(%d)", ts->GetEmcIndex())) ;
1041 // ############Tof#############################
1043 // Info("MakePID", "TOF");
1044 Float_t en = emc->GetEnergy();
1045 Double_t time = emc->GetTime() ;
1046 // cout<<">>>>>>>Energy "<<en<<"Time "<<time<<endl;
1048 // now get the signals probability
1049 // s(pid) in the Bayesian formulation
1051 stof[AliPID::kPhoton][index] = 1.;
1052 stof[AliPID::kElectron][index] = 1.;
1053 stof[AliPID::kEleCon][index] = 1.;
1054 //We assing the same prob to charged hadrons, sum is 1
1055 stof[AliPID::kPion][index] = 1./3.;
1056 stof[AliPID::kKaon][index] = 1./3.;
1057 stof[AliPID::kProton][index] = 1./3.;
1058 //We assing the same prob to neutral hadrons, sum is 1
1059 stof[AliPID::kNeutron][index] = 1./2.;
1060 stof[AliPID::kKaon0][index] = 1./2.;
1061 stof[AliPID::kMuon][index] = 1.;
1063 if(en < fTOFEnThreshold) {
1065 Double_t pTofPion = fTFpiong ->Eval(time) ; //gaus distribution
1066 Double_t pTofKaon = 0;
1068 if(time < fTkaonl[1])
1069 pTofKaon = fTFkaong ->Eval(time) ; //gaus distribution
1071 pTofKaon = fTFkaonl ->Eval(time) ; //landau distribution
1073 Double_t pTofNucleon = 0;
1075 if(time < fThhadronl[1])
1076 pTofNucleon = fTFhhadrong ->Eval(time) ; //gaus distribution
1078 pTofNucleon = fTFhhadronl ->Eval(time) ; //landau distribution
1079 //We assing the same prob to neutral hadrons, sum is the average prob
1080 Double_t pTofNeHadron = (pTofKaon + pTofNucleon)/2. ;
1081 //We assing the same prob to charged hadrons, sum is the average prob
1082 Double_t pTofChHadron = (pTofPion + pTofKaon + pTofNucleon)/3. ;
1084 stof[AliPID::kPhoton][index] = fTFphoton ->Eval(time) ;
1086 stof[AliPID::kEleCon][index] = stof[AliPID::kPhoton][index] ;
1087 //a conversion electron has the photon ToF
1088 stof[AliPID::kMuon][index] = stof[AliPID::kPhoton][index] ;
1090 stof[AliPID::kElectron][index] = pTofPion ;
1092 stof[AliPID::kPion][index] = pTofChHadron ;
1093 stof[AliPID::kKaon][index] = pTofChHadron ;
1094 stof[AliPID::kProton][index] = pTofChHadron ;
1096 stof[AliPID::kKaon0][index] = pTofNeHadron ;
1097 stof[AliPID::kNeutron][index] = pTofNeHadron ;
1100 // Info("MakePID", "Dispersion");
1102 // ###########Shower shape: Dispersion####################
1103 Float_t dispersion = emc->GetDispersion();
1104 //DP: Correct for non-perpendicular incidence
1105 //DP: still to be done
1107 //dispersion is not well defined if the cluster is only in few crystals
1109 sdp[AliPID::kPhoton][index] = 1. ;
1110 sdp[AliPID::kElectron][index] = 1. ;
1111 sdp[AliPID::kPion][index] = 1. ;
1112 sdp[AliPID::kKaon][index] = 1. ;
1113 sdp[AliPID::kProton][index] = 1. ;
1114 sdp[AliPID::kNeutron][index] = 1. ;
1115 sdp[AliPID::kEleCon][index] = 1. ;
1116 sdp[AliPID::kKaon0][index] = 1. ;
1117 sdp[AliPID::kMuon][index] = 1. ;
1119 if(en > fDispEnThreshold && emc->GetMultiplicity() > fDispMultThreshold){
1120 sdp[AliPID::kPhoton][index] = GausF(en , dispersion, fDphoton) ;
1121 sdp[AliPID::kElectron][index] = sdp[AliPID::kPhoton][index] ;
1122 sdp[AliPID::kPion][index] = LandauF(en , dispersion, fDhadron ) ;
1123 sdp[AliPID::kKaon][index] = sdp[AliPID::kPion][index] ;
1124 sdp[AliPID::kProton][index] = sdp[AliPID::kPion][index] ;
1125 sdp[AliPID::kNeutron][index] = sdp[AliPID::kPion][index] ;
1126 sdp[AliPID::kEleCon][index] = sdp[AliPID::kPhoton][index];
1127 sdp[AliPID::kKaon0][index] = sdp[AliPID::kPion][index] ;
1128 sdp[AliPID::kMuon][index] = fDFmuon ->Eval(dispersion) ;
1129 //landau distribution
1132 // Info("MakePID","multiplicity %d, dispersion %f", emc->GetMultiplicity(), dispersion);
1133 // Info("MakePID","ss: photon %f, hadron %f ", sdp[AliPID::kPhoton][index], sdp[AliPID::kPion][index]);
1134 // cout<<">>>>>multiplicity "<<emc->GetMultiplicity()<<", dispersion "<< dispersion<<endl ;
1135 // cout<<"<<<<<ss: photon "<<sdp[AliPID::kPhoton][index]<<", hadron "<<sdp[AliPID::kPion][index]<<endl;
1137 //########## CPV-EMC Distance#######################
1138 // Info("MakePID", "Distance");
1140 Float_t x = TMath::Abs(ts->GetCpvDistance("X")) ;
1141 Float_t z = ts->GetCpvDistance("Z") ;
1144 Double_t pcpvneutral = 0. ;
1146 Double_t elprobx = GausF(en , x, fXelectron) ;
1147 Double_t elprobz = GausF(en , z, fZelectron) ;
1148 Double_t chprobx = GausF(en , x, fXcharged) ;
1149 Double_t chprobz = GausF(en , z, fZcharged) ;
1150 Double_t pcpvelectron = elprobx * elprobz;
1151 Double_t pcpvcharged = chprobx * chprobz;
1153 // cout<<">>>>energy "<<en<<endl;
1154 // cout<<">>>>electron : x "<<x<<" xprob "<<elprobx<<" z "<<z<<" zprob "<<elprobz<<endl;
1155 // cout<<">>>>hadron : x "<<x<<" xprob "<<chprobx<<" z "<<z<<" zprob "<<chprobz<<endl;
1156 // cout<<">>>>electron : px*pz "<<pcpvelectron <<" hadron: px*pz "<<pcpvcharged<<endl;
1158 // Is neutral or charged?
1159 if(pcpvelectron >= pcpvcharged)
1160 pcpv = pcpvelectron ;
1162 pcpv = pcpvcharged ;
1164 if(pcpv < fChargedNeutralThreshold)
1171 // cout<<">>>>>>>>>>>CHARGED>>>>>>>>>>>"<<endl;
1173 scpv[AliPID::kPion][index] = pcpvcharged ;
1174 scpv[AliPID::kKaon][index] = pcpvcharged ;
1175 scpv[AliPID::kProton][index] = pcpvcharged ;
1177 scpv[AliPID::kMuon][index] = pcpvelectron ;
1178 scpv[AliPID::kElectron][index] = pcpvelectron ;
1179 scpv[AliPID::kEleCon][index] = pcpvelectron ;
1181 scpv[AliPID::kPhoton][index] = pcpvneutral ;
1182 scpv[AliPID::kNeutron][index] = pcpvneutral ;
1183 scpv[AliPID::kKaon0][index] = pcpvneutral ;
1186 // Info("MakePID", "CPV passed");
1188 //############## Pi0 #############################
1189 stof[AliPID::kPi0][index] = 0. ;
1190 scpv[AliPID::kPi0][index] = 0. ;
1191 sdp [AliPID::kPi0][index] = 0. ;
1194 // pi0 are detected via decay photon
1195 stof[AliPID::kPi0][index] = stof[AliPID::kPhoton][index];
1196 scpv[AliPID::kPi0][index] = pcpvneutral ;
1197 if(emc->GetMultiplicity() > fDispMultThreshold)
1198 sdp [AliPID::kPi0][index] = GausF(en , dispersion, fDpi0) ;
1199 //sdp [AliPID::kPi0][index] = GausPol2(en , dispersion, fDpi0) ;
1200 // cout<<"E = "<<en<<" GeV; disp = "<<dispersion<<"; mult = "
1201 // <<emc->GetMultiplicity()<<endl;
1202 // cout<<"PDF: photon = "<<sdp [AliPID::kPhoton][index]<<"; pi0 = "
1203 // <<sdp [AliPID::kPi0][index]<<endl;
1209 //############## muon #############################
1212 //Muons deposit few energy
1213 scpv[AliPID::kMuon][index] = 0 ;
1214 stof[AliPID::kMuon][index] = 0 ;
1215 sdp [AliPID::kMuon][index] = 0 ;
1218 //Weight to apply to hadrons due to energy reconstruction
1220 Float_t weight = fERecWeight ->Eval(en) ;
1222 sw[AliPID::kPhoton][index] = 1. ;
1223 sw[AliPID::kElectron][index] = 1. ;
1224 sw[AliPID::kPion][index] = weight ;
1225 sw[AliPID::kKaon][index] = weight ;
1226 sw[AliPID::kProton][index] = weight ;
1227 sw[AliPID::kNeutron][index] = weight ;
1228 sw[AliPID::kEleCon][index] = 1. ;
1229 sw[AliPID::kKaon0][index] = weight ;
1230 sw[AliPID::kMuon][index] = weight ;
1231 sw[AliPID::kPi0][index] = 1. ;
1234 // cout<<"######################################################"<<endl;
1235 // //cout<<"MakePID: energy "<<en<<", tof "<<time<<", distance "<<distance<<", dispersion "<<dispersion<<endl ;
1236 // cout<<"MakePID: energy "<<en<<", tof "<<time<<", dispersion "<<dispersion<<", x "<<x<<", z "<<z<<endl ;
1237 // cout<<">>>>>multiplicity "<<emc->GetMultiplicity()<<endl;
1238 // cout<<">>>>electron : xprob "<<elprobx<<" zprob "<<elprobz<<endl;
1239 // cout<<">>>>hadron : xprob "<<chprobx<<" zprob "<<chprobz<<endl;
1240 // cout<<">>>>electron : px*pz "<<pcpvelectron <<" hadron: px*pz "<<pcpvcharged<<endl;
1242 // cout<<"Photon , pid "<< fInitPID[AliPID::kPhoton]<<" tof "<<stof[AliPID::kPhoton][index]
1243 // <<", cpv "<<scpv[AliPID::kPhoton][index]<<", ss "<<sdp[AliPID::kPhoton][index]<<endl;
1244 // cout<<"EleCon , pid "<< fInitPID[AliPID::kEleCon]<<", tof "<<stof[AliPID::kEleCon][index]
1245 // <<", cpv "<<scpv[AliPID::kEleCon][index]<<" ss "<<sdp[AliPID::kEleCon][index]<<endl;
1246 // cout<<"Electron , pid "<< fInitPID[AliPID::kElectron]<<", tof "<<stof[AliPID::kElectron][index]
1247 // <<", cpv "<<scpv[AliPID::kElectron][index]<<" ss "<<sdp[AliPID::kElectron][index]<<endl;
1248 // cout<<"Muon , pid "<< fInitPID[AliPID::kMuon]<<", tof "<<stof[AliPID::kMuon][index]
1249 // <<", cpv "<<scpv[AliPID::kMuon][index]<<" ss "<<sdp[AliPID::kMuon][index]<<endl;
1250 // cout<<"Pi0 , pid "<< fInitPID[AliPID::kPi0]<<", tof "<<stof[AliPID::kPi0][index]
1251 // <<", cpv "<<scpv[AliPID::kPi0][index]<<" ss "<<sdp[AliPID::kPi0][index]<<endl;
1252 // cout<<"Pion , pid "<< fInitPID[AliPID::kPion]<<", tof "<<stof[AliPID::kPion][index]
1253 // <<", cpv "<<scpv[AliPID::kPion][index]<<" ss "<<sdp[AliPID::kPion][index]<<endl;
1254 // cout<<"Kaon0 , pid "<< fInitPID[AliPID::kKaon0]<<", tof "<<stof[AliPID::kKaon0][index]
1255 // <<", cpv "<<scpv[AliPID::kKaon0][index]<<" ss "<<sdp[AliPID::kKaon0][index]<<endl;
1256 // cout<<"Kaon , pid "<< fInitPID[AliPID::kKaon]<<", tof "<<stof[AliPID::kKaon][index]
1257 // <<", cpv "<<scpv[AliPID::kKaon][index]<<" ss "<<sdp[AliPID::kKaon][index]<<endl;
1258 // cout<<"Neutron , pid "<< fInitPID[AliPID::kNeutron]<<", tof "<<stof[AliPID::kNeutron][index]
1259 // <<", cpv "<<scpv[AliPID::kNeutron][index]<<" ss "<<sdp[AliPID::kNeutron][index]<<endl;
1260 // cout<<"Proton , pid "<< fInitPID[AliPID::kProton]<<", tof "<<stof[AliPID::kProton][index]
1261 // <<", cpv "<<scpv[AliPID::kProton][index]<<" ss "<<sdp[AliPID::kProton][index]<<endl;
1262 // cout<<"######################################################"<<endl;
1267 //for (index = 0 ; index < kSPECIES ; index++)
1268 // pid[index] /= nparticles ;
1271 // Info("MakePID", "Total Probability calculation");
1273 for(index = 0 ; index < nparticles ; index ++) {
1275 AliPHOSRecParticle * recpar = static_cast<AliPHOSRecParticle *>(fRecParticles->At(index));
1277 //Conversion electron?
1279 if(recpar->IsEleCon()){
1280 fInitPID[AliPID::kEleCon] = 1. ;
1281 fInitPID[AliPID::kPhoton] = 0. ;
1282 fInitPID[AliPID::kElectron] = 0. ;
1285 fInitPID[AliPID::kEleCon] = 0. ;
1286 fInitPID[AliPID::kPhoton] = 1. ;
1287 fInitPID[AliPID::kElectron] = 1. ;
1289 // fInitPID[AliPID::kEleCon] = 0. ;
1292 // calculates the Bayesian weight
1296 for (jndex = 0 ; jndex < kSPECIES ; jndex++)
1297 wn += stof[jndex][index] * sdp[jndex][index] * scpv[jndex][index] *
1298 sw[jndex][index] * fInitPID[jndex] ;
1300 // cout<<"*************wn "<<wn<<endl;
1301 if (TMath::Abs(wn)>0)
1302 for (jndex = 0 ; jndex < kSPECIES ; jndex++) {
1303 //cout<<"jndex "<<jndex<<" wn "<<wn<<" SetPID * wn"
1304 //<<stof[jndex][index] * sdp[jndex][index] * pid[jndex] << endl;
1305 //cout<<" tof "<<stof[jndex][index] << " disp " <<sdp[jndex][index] << " pid "<< fInitPID[jndex] << endl;
1306 // if(jndex == AliPID::kPi0 || jndex == AliPID::kPhoton){
1307 // cout<<"Particle "<<jndex<<" final prob * wn "
1308 // <<stof[jndex][index] * sdp[jndex][index] * scpv[jndex][index] *
1309 // fInitPID[jndex] <<" wn "<< wn<<endl;
1310 // cout<<"pid "<< fInitPID[jndex]<<", tof "<<stof[jndex][index]
1311 // <<", cpv "<<scpv[jndex][index]<<" ss "<<sdp[jndex][index]<<endl;
1313 recpar->SetPID(jndex, stof[jndex][index] * sdp[jndex][index] *
1314 sw[jndex][index] * scpv[jndex][index] *
1315 fInitPID[jndex] / wn) ;
1318 // Info("MakePID", "Delete");
1320 for (Int_t i =0; i< kSPECIES; i++){
1326 // Info("MakePID","End MakePID");
1329 //____________________________________________________________________________
1330 void AliPHOSPIDv1::MakeRecParticles()
1332 // Makes a RecParticle out of a TrackSegment
1334 if ( !fEMCRecPoints || !fCPVRecPoints || !fTrackSegments ) {
1335 AliFatal("RecPoints or TrackSegments not found !") ;
1337 fRecParticles->Clear();
1339 TIter next(fTrackSegments) ;
1340 AliPHOSTrackSegment * ts ;
1342 AliPHOSRecParticle * rp ;
1343 while ( (ts = (AliPHOSTrackSegment *)next()) ) {
1344 // cout<<">>>>>>>>>>>>>>>PCA Index "<<index<<endl;
1345 new( (*fRecParticles)[index] ) AliPHOSRecParticle() ;
1346 rp = (AliPHOSRecParticle *)fRecParticles->At(index) ;
1347 rp->SetTrackSegment(index) ;
1348 rp->SetIndexInList(index) ;
1350 AliPHOSEmcRecPoint * emc = 0 ;
1351 if(ts->GetEmcIndex()>=0)
1352 emc = (AliPHOSEmcRecPoint *) fEMCRecPoints->At(ts->GetEmcIndex()) ;
1354 AliPHOSCpvRecPoint * cpv = 0 ;
1355 if(ts->GetCpvIndex()>=0)
1356 cpv = (AliPHOSCpvRecPoint *) fCPVRecPoints->At(ts->GetCpvIndex()) ;
1359 track = ts->GetTrackIndex() ;
1361 // Now set type (reconstructed) of the particle
1363 // Choose the cluster energy range
1366 AliFatal(Form("-> emc(%d)", ts->GetEmcIndex())) ;
1369 Float_t e = emc->GetEnergy() ;
1372 emc->GetElipsAxis(lambda) ;
1374 if((lambda[0]>0.01) && (lambda[1]>0.01)){
1375 // Looking PCA. Define and calculate the data (X),
1376 // introduce in the function X2P that gives the components (P).
1378 Float_t spher = 0. ;
1379 Float_t emaxdtotal = 0. ;
1381 if((lambda[0]+lambda[1])!=0)
1382 spher=TMath::Abs(lambda[0]-lambda[1])/(lambda[0]+lambda[1]);
1384 emaxdtotal=emc->GetMaximalEnergy()/emc->GetEnergy();
1388 fX[2] = emc->GetDispersion() ;
1390 fX[4] = emc->GetMultiplicity() ;
1391 fX[5] = emaxdtotal ;
1392 fX[6] = emc->GetCoreEnergy() ;
1394 fPrincipalPhoton->X2P(fX,fPPhoton);
1395 fPrincipalPi0 ->X2P(fX,fPPi0);
1399 fPPhoton[0]=-100.0; //We do not accept clusters with
1400 fPPhoton[1]=-100.0; //one cell as a photon-like
1405 Float_t time = emc->GetTime() ;
1408 // Loop of Efficiency-Purity (the 3 points of purity or efficiency
1409 // are taken into account to set the particle identification)
1410 for(Int_t effPur = 0; effPur < 3 ; effPur++){
1412 // Looking at the CPV detector. If RCPV greater than CpvEmcDistance,
1413 // 1st,2nd or 3rd bit (depending on the efficiency-purity point )
1415 if(GetCPVBit(ts, effPur,e) == 1 ){
1416 rp->SetPIDBit(effPur) ;
1417 //cout<<"CPV bit "<<effPur<<endl;
1419 // Looking the TOF. If TOF smaller than gate, 4th, 5th or 6th
1420 // bit (depending on the efficiency-purity point )is set to 1
1421 if(time< (*fParameters)(3,effPur))
1422 rp->SetPIDBit(effPur+3) ;
1425 //If we are inside the ellipse, 7th, 8th or 9th
1426 // bit (depending on the efficiency-purity point )is set to 1
1427 if(GetPrincipalBit("photon",fPPhoton,effPur,e) == 1)
1428 rp->SetPIDBit(effPur+6) ;
1431 //If we are inside the ellipse, 10th, 11th or 12th
1432 // bit (depending on the efficiency-purity point )is set to 1
1433 if(GetPrincipalBit("pi0" ,fPPi0 ,effPur,e) == 1)
1434 rp->SetPIDBit(effPur+9) ;
1436 if(GetHardPhotonBit(emc))
1438 if(GetHardPi0Bit (emc))
1444 //Set momentum, energy and other parameters
1445 Float_t encal = GetCalibratedEnergy(e);
1446 TVector3 dir = GetMomentumDirection(emc,cpv) ;
1448 rp->SetMomentum(dir.X(),dir.Y(),dir.Z(),encal) ;
1450 rp->Name(); //If photon sets the particle pdg name to gamma
1451 rp->SetProductionVertex(fVtx.X(),fVtx.Y(),fVtx.Z(),0);
1452 rp->SetFirstMother(-1);
1453 rp->SetLastMother(-1);
1454 rp->SetFirstDaughter(-1);
1455 rp->SetLastDaughter(-1);
1456 rp->SetPolarisation(0,0,0);
1457 //Set the position in global coordinate system from the RecPoint
1458 AliPHOSTrackSegment * ts1 = static_cast<AliPHOSTrackSegment *>(fTrackSegments->At(rp->GetPHOSTSIndex()));
1459 AliPHOSEmcRecPoint * erp = static_cast<AliPHOSEmcRecPoint *>(fEMCRecPoints->At(ts1->GetEmcIndex()));
1461 fGeom->GetGlobalPHOS(erp, pos) ;
1467 //____________________________________________________________________________
1468 void AliPHOSPIDv1::Print(const Option_t *) const
1470 // Print the parameters used for the particle type identification
1472 AliInfo("=============== AliPHOSPIDv1 ================") ;
1473 printf("Making PID\n") ;
1474 printf(" Pricipal analysis file from 0.5 to 100 %s\n", fFileNamePrincipalPhoton.Data() ) ;
1475 printf(" Name of parameters file %s\n", fFileNameParameters.Data() ) ;
1476 printf(" Matrix of Parameters: 14x4\n") ;
1477 printf(" Energy Calibration 1x3 [3 parametres to calibrate energy: A + B* E + C * E^2]\n") ;
1478 printf(" RCPV 2x3 rows x and z, columns function cut parameters\n") ;
1479 printf(" TOF 1x3 [High Eff-Low Pur,Medium Eff-Pur, Low Eff-High Pur]\n") ;
1480 printf(" PCA 5x4 [5 ellipse parametres and 4 parametres to calculate them: A/Sqrt(E) + B* E + C * E^2 + D]\n") ;
1481 printf(" Pi0 PCA 5x3 [5 ellipse parametres and 3 parametres to calculate them: A + B* E + C * E^2]\n") ;
1482 fParameters->Print() ;
1487 //____________________________________________________________________________
1488 void AliPHOSPIDv1::PrintRecParticles(Option_t * option)
1490 // Print table of reconstructed particles
1493 message = " found " ;
1494 message += fRecParticles->GetEntriesFast();
1495 message += " RecParticles\n" ;
1497 if(strstr(option,"all")) { // printing found TS
1498 message += "\n PARTICLE Index \n" ;
1501 for (index = 0 ; index < fRecParticles->GetEntries() ; index++) {
1502 AliPHOSRecParticle * rp = (AliPHOSRecParticle * ) fRecParticles->At(index) ;
1504 message += rp->Name().Data() ;
1506 message += rp->GetIndexInList() ;
1508 message += rp->GetType() ;
1511 AliInfo(message.Data() ) ;
1514 //____________________________________________________________________________
1515 void AliPHOSPIDv1::SetParameters()
1517 // PCA : To do the Principal Components Analysis it is necessary
1518 // the Principal file, which is opened here
1519 fX = new double[7]; // Data for the PCA
1520 fPPhoton = new double[7]; // Eigenvalues of the PCA
1521 fPPi0 = new double[7]; // Eigenvalues of the Pi0 PCA
1523 // Read photon principals from the photon file
1525 fFileNamePrincipalPhoton = "$ALICE_ROOT/PHOS/PCA8pa15_0.5-100.root" ;
1526 TFile f( fFileNamePrincipalPhoton.Data(), "read" ) ;
1527 fPrincipalPhoton = dynamic_cast<TPrincipal*> (f.Get("principal")) ;
1530 // Read pi0 principals from the pi0 file
1532 fFileNamePrincipalPi0 = "$ALICE_ROOT/PHOS/PCA_pi0_40-120.root" ;
1533 TFile fPi0( fFileNamePrincipalPi0.Data(), "read" ) ;
1534 fPrincipalPi0 = dynamic_cast<TPrincipal*> (fPi0.Get("principal")) ;
1537 // Open parameters file and initialization of the Parameters matrix.
1538 // In the File Parameters.dat are all the parameters. These are introduced
1539 // in a matrix of 16x4
1541 // All the parameters defined in this file are, in order of row:
1542 // line 0 : calibration
1543 // lines 1,2 : CPV rectangular cat for X and Z
1545 // lines 4-8 : parameters to calculate photon PCA ellipse
1546 // lines 9-13: parameters to calculate pi0 PCA ellipse
1547 // lines 14-15: parameters to calculate border for high-pt photons and pi0
1549 fFileNameParameters = gSystem->ExpandPathName("$ALICE_ROOT/PHOS/Parameters.dat");
1550 fParameters = new TMatrixF(16,4) ;
1551 const Int_t kMaxLeng=255;
1552 char string[kMaxLeng];
1554 // Open a text file with PID parameters
1555 FILE *fd = fopen(fFileNameParameters.Data(),"r");
1557 AliFatal(Form("File %s with a PID parameters cannot be opened\n",
1558 fFileNameParameters.Data()));
1561 // Read parameter file line-by-line and skip empty line and comments
1562 while (fgets(string,kMaxLeng,fd) != NULL) {
1563 if (string[0] == '\n' ) continue;
1564 if (string[0] == '!' ) continue;
1565 sscanf(string, "%f %f %f %f",
1566 &(*fParameters)(i,0), &(*fParameters)(i,1),
1567 &(*fParameters)(i,2), &(*fParameters)(i,3));
1569 AliDebug(1, Form("Line %d: %s",i,string));
1574 //____________________________________________________________________________
1575 void AliPHOSPIDv1::SetParameterCalibration(Int_t i,Float_t param)
1577 // Set parameter "Calibration" i to a value param
1579 AliError(Form("Invalid parameter number: %d",i));
1581 (*fParameters)(0,i) = param ;
1584 //____________________________________________________________________________
1585 void AliPHOSPIDv1::SetParameterCpv2Emc(Int_t i, TString axis, Float_t cut)
1587 // Set the parameters to calculate Cpv-to-Emc Distance Cut depending on
1588 // Purity-Efficiency point i
1591 AliError(Form("Invalid parameter number: %d",i));
1594 if (axis == "x") (*fParameters)(1,i) = cut;
1595 else if (axis == "z") (*fParameters)(2,i) = cut;
1597 AliError(Form("Invalid axis name: %s",axis.Data()));
1602 //____________________________________________________________________________
1603 void AliPHOSPIDv1::SetParameterPhotonBoundary(Int_t i,Float_t param)
1605 // Set parameter "Hard photon boundary" i to a value param
1607 AliError(Form("Invalid parameter number: %d",i));
1609 (*fParameters)(14,i) = param ;
1612 //____________________________________________________________________________
1613 void AliPHOSPIDv1::SetParameterPi0Boundary(Int_t i,Float_t param)
1615 // Set parameter "Hard pi0 boundary" i to a value param
1617 AliError(Form("Invalid parameter number: %d",i));
1619 (*fParameters)(15,i) = param ;
1622 //_____________________________________________________________________________
1623 void AliPHOSPIDv1::SetParameterTimeGate(Int_t i, Float_t gate)
1625 // Set the parameter TimeGate depending on Purity-Efficiency point i
1627 AliError(Form("Invalid Efficiency-Purity choice %d",i));
1629 (*fParameters)(3,i)= gate ;
1632 //_____________________________________________________________________________
1633 void AliPHOSPIDv1::SetParameterToCalculateEllipse(TString particle, TString param, Int_t i, Float_t par)
1635 // Set the parameter "i" that is needed to calculate the ellipse
1636 // parameter "param" for a particle "particle"
1643 if (particle == "photon") offset=0;
1644 else if (particle == "pi0") offset=5;
1646 AliError(Form("Wrong particle name: %s (choose from pi0/photon)\n",
1649 if (param.Contains("a")) p=4+offset;
1650 else if(param.Contains("b")) p=5+offset;
1651 else if(param.Contains("c")) p=6+offset;
1652 else if(param.Contains("x0"))p=7+offset;
1653 else if(param.Contains("y0"))p=8+offset;
1655 AliError(Form("No parameter with index %d", i)) ;
1657 AliError(Form("No parameter with name %s", param.Data() )) ;
1659 (*fParameters)(p,i) = par ;
1662 //____________________________________________________________________________
1663 void AliPHOSPIDv1::GetVertex(void)
1664 { //extract vertex either using ESD or generator
1666 //Try to extract vertex from data
1668 const AliESDVertex *esdVtx = fESD->GetVertex() ;
1669 if(esdVtx && esdVtx->GetChi2()!=0.){
1670 fVtx.SetXYZ(esdVtx->GetXv(),esdVtx->GetYv(),esdVtx->GetZv()) ;
1675 // Use vertex diamond from CDB GRP folder if the one from ESD is missing
1677 AliWarning("Can not read vertex from data, use fixed \n") ;
1678 fVtx.SetXYZ(0.,0.,0.) ;
1681 //_______________________________________________________________________
1682 void AliPHOSPIDv1::SetInitPID(const Double_t *p) {
1683 // Sets values for the initial population of each particle type
1684 for (Int_t i=0; i<AliPID::kSPECIESN; i++) fInitPID[i] = p[i];
1686 //_______________________________________________________________________
1687 void AliPHOSPIDv1::GetInitPID(Double_t *p) const {
1688 // Gets values for the initial population of each particle type
1689 for (Int_t i=0; i<AliPID::kSPECIESN; i++) p[i] = fInitPID[i];