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 **************************************************************************/
17 /* History of cvs commits:
20 * Revision 1.10 2007/03/09 14:34:11 gustavo
21 * Correct probability calculation, added missing initialization of data members
23 * Revision 1.9 2007/02/20 20:17:43 hristov
24 * Corrected array size, removed warnings (icc)
26 * Revision 1.8 2006/12/19 08:49:35 gustavo
27 * New PID class for EMCAL, bayesian analysis done with ESD data, PID information filled when calling AliEMCALPID in AliEMCALReconstructor::FillESD()
31 // to compute PID for all the clusters in ESDs.root file
32 // the ESDs.root have to be in the same directory as the class
38 // AliEMCALPID::CalculPID(Energy,Lambda0)
39 // Calcul PID for all clusters in AliESDs.root file
40 // keep this function for the moment for a simple verification, could be removed
44 // AliEMCALPID::CalculPID(Energy,Lambda0)
45 // calcul PID Weght for a cluster with Energy, Lambda0 .
46 // Double_t PIDFinal[AliPID::kSPECIESN] is the standard PID for :
50 // kElectron : fPIDFinal[0]
51 // kMuon : fPIDFinal[1]
52 // kPion : fPIDFinal[2]
53 // kKaon : fPIDFinal[3]
54 // kProton : fPIDFinal[4]
55 // kPhoton : fPIDFinal[5]
56 // kPi0 : fPIDFinal[6]
57 // kNeutron : fPIDFinal[7]
58 // kKaon0 : fPIDFinal[8]
59 // kEleCon : fPIDFinal[9]
60 // kUnknown : fPIDFinal[10]
63 // PID[3] is a simple PID for
64 // Electron & Photon PID[0]
72 // --- ROOT system ---
74 // standard C++ includes
75 #include <Riostream.h>
84 #include "TClonesArray.h"
86 #include "TLorentzVector.h"
91 #include "TParticle.h"
94 // #include "AliRun.h"
95 // #include "AliRunLoader.h"
96 // #include "AliHeader.h"
97 // #include "AliLoader.h"
98 // #include "AliStack.h"
99 // #include "AliESDtrack.h"
100 // #include "AliESD.h"
102 #include "AliEMCALPID.h"
104 ClassImp(AliEMCALPID)
106 //______________________________________________
107 AliEMCALPID::AliEMCALPID():
108 fPrintInfo(kFALSE), fProbGamma(0.),fProbPiZero(0.),fProbHadron(0.),fReconstructor(kFALSE)
112 // Initialize all constant values which have to be used
113 // during PID algorithm execution
116 // set flag for printing to FALSE by default
119 // as a first step, all array elements are initialized to 0.0
121 for (i = 0; i < 6; i++) {
122 for (j = 0; j < 6; j++) {
123 fGamma[i][j] = fHadron[i][j] = fPiZero5to10[i][j] = fPiZero10to60[i][j] = 0.;
127 // then, only the ones which must be not zero are initialized
128 // while the others will remain to the value 0.0
130 fGamma[0][0] = 0.038022;
131 fGamma[0][1] = -0.0001883;
132 fGamma[0][2] = 5.449e-06;
134 fGamma[1][0] = 0.207313;
135 fGamma[1][1] = -0.000978;
136 fGamma[1][2] = 0.00001634;
138 fGamma[2][0] = 0.043364;
139 fGamma[2][1] = -0.0002048;
140 fGamma[2][2] = 8.661e-06;
141 fGamma[2][3] = -1.353e-07;
143 fGamma[3][0] = 0.265004;
144 fGamma[3][1] = 0.061298;
145 fGamma[3][2] = -0.003203;
146 fGamma[3][3] = 4.73e-05;
148 fGamma[4][0] = 0.243579;
149 fGamma[4][1] = -1.614e-05;
151 fGamma[5][0] = 0.002942;
152 fGamma[5][1] = -3.976e-05;
154 fHadron[0][0] = 0.011945 / 3.;
155 fHadron[0][1] = 0.000386 / 3.;
156 fHadron[0][2] = -0.000014 / 3.;
157 fHadron[0][3] = 1.336e-07 / 3.;
159 fHadron[1][0] = 0.496544;
160 fHadron[1][1] = -0.003226;
161 fHadron[1][2] = 0.00001678;
163 fHadron[2][0] = 0.144838;
164 fHadron[2][1] = -0.002954;
165 fHadron[2][2] = 0.00008754;
166 fHadron[2][3] = -7.587e-07;
168 fHadron[3][0] = 1.264461 / 7.;
169 fHadron[3][1] = 0.002097 / 7.;
171 fHadron[4][0] = 0.261950;
172 fHadron[4][1] = -0.001078;
173 fHadron[4][2] = 0.00003237;
174 fHadron[4][3] = -3.241e-07;
177 fHadron[5][0] = 0.010317;
184 fPiZero5to10[0][0] = 0.009138;
185 fPiZero5to10[0][1] = 0.0006377;
187 fPiZero5to10[1][0] = 0.08;
189 fPiZero5to10[2][0] = -0.061119;
190 fPiZero5to10[2][1] = 0.019013;
192 fPiZero5to10[3][0] = 0.2;
194 fPiZero5to10[4][0] = 0.252044;
195 fPiZero5to10[4][1] = -0.002315;
197 fPiZero5to10[5][0] = 0.002942;
198 fPiZero5to10[5][1] = -3.976e-05;
200 fPiZero10to60[0][0] = 0.009138;
201 fPiZero10to60[0][1] = 0.0006377;
203 fPiZero10to60[1][0] = 1.272837;
204 fPiZero10to60[1][1] = -0.069708;
205 fPiZero10to60[1][2] = 0.001568;
206 fPiZero10to60[1][3] = -1.162e-05;
208 fPiZero10to60[2][0] = 0.139703;
209 fPiZero10to60[2][1] = 0.003687;
210 fPiZero10to60[2][2] = -0.000568;
211 fPiZero10to60[2][3] = 1.498e-05;
212 fPiZero10to60[2][4] = -1.174e-07;
214 fPiZero10to60[3][0] = -0.826367;
215 fPiZero10to60[3][1] = 0.096951;
216 fPiZero10to60[3][2] = -0.002215;
217 fPiZero10to60[3][3] = 2.523e-05;
219 fPiZero10to60[4][0] = 0.249890;
220 fPiZero10to60[4][1] = -0.000063;
222 fPiZero10to60[5][0] = 0.002942;
223 fPiZero10to60[5][1] = -3.976e-05;
228 fReconstructor = kFALSE;
231 //______________________________________________
232 void AliEMCALPID::RunPID(AliESD *esd)
235 // Make the PID for all the EMCAL clusters containedin the ESDs File
236 // but just gamma/PiO/Hadron
238 // trivial check against NULL object passed
241 AliInfo("NULL ESD object passed !!" );
245 Int_t nClusters = esd->GetNumberOfEMCALClusters();
246 Int_t firstCluster = esd->GetFirstEMCALCluster();
247 Double_t energy, lambda0;
248 for (Int_t iCluster = firstCluster; iCluster < (nClusters + firstCluster); iCluster++) {
250 AliESDCaloCluster *clust = esd->GetCaloCluster(iCluster);
251 energy = clust->GetClusterEnergy();
252 lambda0 = clust->GetM02();
253 // verify cluster type
254 Int_t clusterType= clust->GetClusterType();
255 if (clusterType == AliESDCaloCluster::kClusterv1 && lambda0 != 0 && energy < 1000) {
258 // reject clusters with lambda0 = 0
261 ComputePID(energy, lambda0);
265 AliInfo("___________________________________________________");
266 AliInfo(Form( "Particle Energy = %f",energy));
267 AliInfo(Form( "Particle Lambda0 of the particle = %f", lambda0) );
268 AliInfo("PIDWeight of the particle :" );
269 AliInfo(Form( " GAMMA : %f",fPID[0] ));
270 AliInfo(Form( " PiZero : %f",fPID[1] ));
271 AliInfo(Form( " HADRON : %f", fPID[2] ));
272 AliInfo("_________________________________________");
273 AliInfo(Form( " kElectron : %f", fPIDFinal[0]) );
274 AliInfo(Form( " kMuon : %f", fPIDFinal[1] ));
275 AliInfo(Form( " kPion : %f", fPIDFinal[2] ));
276 AliInfo(Form( " kKaon : %f", fPIDFinal[3] ));
277 AliInfo(Form( " kProton : %f", fPIDFinal[4] ));
278 AliInfo(Form( " kPhoton : %f", fPIDFinal[5] ));
279 AliInfo(Form( " kPi0 : %f", fPIDFinal[6] ));
280 AliInfo(Form( " kNeutron : %f", fPIDFinal[7] ));
281 AliInfo(Form( " kKaon0 : %f", fPIDFinal[8] ));
282 AliInfo(Form( " kEleCon : %f", fPIDFinal[9] ));
283 AliInfo(Form( " kUnknown : %f", fPIDFinal[10] ));
284 AliInfo("___________________________________________________");
287 if(fReconstructor) // In case it is called during reconstruction.
288 clust->SetPid(fPIDFinal);
289 } // end if (clusterType...)
290 } // end for (iCluster...)
293 //__________________________________________________________
294 void AliEMCALPID::ComputePID(Double_t energy, Double_t lambda0)
297 // This is the main command, which uses the distributions computed and parametrised,
298 // and gives the PID by the bayesian method.
301 if (energy<5){energy =6;}
304 TArrayD paramDistribGamma = DistLambda0(energy, 1);
305 TArrayD paramDistribPiZero = DistLambda0(energy, 2);
306 TArrayD paramDistribHadron = DistLambda0(energy, 3);
308 Bool_t norm = kFALSE;
310 fProbGamma = TMath::Gaus(lambda0, paramDistribGamma[1], paramDistribGamma[2], norm) * paramDistribGamma[0];
311 fProbGamma += TMath::Landau(lambda0, paramDistribGamma[4], paramDistribGamma[5], norm) * paramDistribGamma[3];
312 fProbPiZero = TMath::Gaus(lambda0, paramDistribPiZero[1], paramDistribPiZero[2], norm) * paramDistribPiZero[0];
313 fProbPiZero += TMath::Landau(lambda0, paramDistribPiZero[4], paramDistribPiZero[5], norm) * paramDistribPiZero[3];
314 fProbHadron = TMath::Gaus(lambda0, paramDistribHadron[1], paramDistribHadron[2], norm) * paramDistribHadron[0];
315 fProbHadron += TMath::Landau(lambda0, paramDistribHadron[4], paramDistribHadron[5], norm) * paramDistribHadron[3];
317 // compute PID Weight
318 fPIDWeight[0] = fProbGamma / (fProbGamma + fProbPiZero + fProbHadron);
319 fPIDWeight[1] = fProbPiZero / (fProbGamma+fProbPiZero+fProbHadron);
320 fPIDWeight[2] = fProbHadron / (fProbGamma+fProbPiZero+fProbHadron);
322 SetPID(fPIDWeight[0], 0);
323 SetPID(fPIDWeight[1], 1);
324 SetPID(fPIDWeight[2], 2);
326 // sortie ecran pid Weight only for control (= in english ???)
328 AliInfo(Form( "Energy in loop = %f", energy) );
329 AliInfo(Form( "Lambda0 in loop = %f", lambda0) );
330 AliInfo(Form( "fProbGamma in loop = %f", fProbGamma) );
331 // AliInfo(Form( "fParametresDistribGamma[2] = %f", fParamDistribGamma[2]) );
332 AliInfo(Form( "fProbaPiZero = %f", fProbPiZero ));
333 AliInfo(Form( "fProbaHadron = %f", fProbHadron) );
334 AliInfo(Form( "PIDWeight in loop = %f ||| %f ||| %f", fPIDWeight[0] , fPIDWeight[1], fPIDWeight[2]) );
335 AliInfo(Form( "fGamma[2][2] = %f", fGamma[2][2] ));
336 AliInfo("********************************************************" );
339 fPIDFinal[0] = fPIDWeight[0]/2;
340 fPIDFinal[1] = fPIDWeight[2]/8;
341 fPIDFinal[2] = fPIDWeight[2]/8;
342 fPIDFinal[3] = fPIDWeight[2]/8;
343 fPIDFinal[4] = fPIDWeight[2]/8;
344 fPIDFinal[5] = fPIDWeight[0]/2;
345 fPIDFinal[6] = fPIDWeight[1] ;
346 fPIDFinal[7] = fPIDWeight[2]/8;
347 fPIDFinal[8] = fPIDWeight[2]/8;
348 fPIDFinal[9] = fPIDWeight[2]/8;
349 fPIDFinal[10] = fPIDWeight[2]/8;
352 //________________________________________________________
353 TArrayD AliEMCALPID::DistLambda0(Double_t energy, Int_t type)
356 // Compute the values of the parametrised distributions using the data initialised before.
358 Double_t constGauss = 0., meanGauss = 0., sigmaGauss = 0.;
359 Double_t constLandau=0., mpvLandau=0., sigmaLandau=0.;
360 TArrayD distributionParam(6);
364 constGauss = Polynomial(energy, fGamma[0]);
365 meanGauss = Polynomial(energy, fGamma[1]);
366 sigmaGauss = Polynomial(energy, fGamma[2]);
367 constLandau = Polynomial(energy, fGamma[3]);
368 mpvLandau = Polynomial(energy, fGamma[4]);
369 sigmaLandau = Polynomial(energy, fGamma[5]);
373 constGauss = Polynomial(energy, fPiZero5to10[0]);
374 meanGauss = Polynomial(energy, fPiZero5to10[1]);
375 sigmaGauss = Polynomial(energy, fPiZero5to10[2]);
376 constLandau = Polynomial(energy, fPiZero5to10[3]);
377 mpvLandau = Polynomial(energy, fPiZero5to10[4]);
378 sigmaLandau = Polynomial(energy, fPiZero5to10[5]);
381 constGauss = Polynomial(energy, fPiZero10to60[0]);
382 meanGauss = Polynomial(energy, fPiZero10to60[1]);
383 sigmaGauss = Polynomial(energy, fPiZero10to60[2]);
384 constLandau = Polynomial(energy, fPiZero10to60[3]);
385 mpvLandau = Polynomial(energy, fPiZero10to60[4]);
386 sigmaLandau = Polynomial(energy, fPiZero10to60[5]);
390 constGauss = Polynomial(energy, fHadron[0]);
391 meanGauss = Polynomial(energy, fHadron[1]);
392 sigmaGauss = Polynomial(energy, fHadron[2]);
393 constLandau = Polynomial(energy, fHadron[3]);
394 mpvLandau = Polynomial(energy, fHadron[4]);
395 sigmaLandau = Polynomial(energy, fHadron[5]);
399 distributionParam[0] = constGauss;
400 distributionParam[1] = meanGauss;
401 distributionParam[2] = sigmaGauss;
402 distributionParam[3] = constLandau;
403 distributionParam[4] = mpvLandau;
404 distributionParam[5] = sigmaLandau;
406 return distributionParam;
409 //_______________________________________________________
410 Double_t AliEMCALPID::Polynomial(Double_t x, Double_t *params)
413 // Compute a polynomial for a given value of 'x'
414 // with the array of parameters passed as the second arg
419 y += params[2] * x * x;
420 y += params[3] * x * x * x;
421 y += params[4] * x * x * x * x;
422 y += params[5] * x * x * x * x * x;