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:
22 // to compute PID for all the clusters in ESDs.root file
23 // the ESDs.root have to be in the same directory as the class
29 // AliEMCALPID::CalculPID(Energy,Lambda0)
30 // Calcul PID for all clusters in AliESDs.root file
31 // keep this function for the moment for a simple verification, could be removed
35 // AliEMCALPID::CalculPID(Energy,Lambda0)
36 // calcul PID Weght for a cluster with Energy, Lambda0 .
37 // Double_t PIDFinal[AliPID::kSPECIESN] is the standard PID for :
41 // kElectron : fPIDFinal[0]
42 // kMuon : fPIDFinal[1]
43 // kPion : fPIDFinal[2]
44 // kKaon : fPIDFinal[3]
45 // kProton : fPIDFinal[4]
46 // kPhoton : fPIDFinal[5]
47 // kPi0 : fPIDFinal[6]
48 // kNeutron : fPIDFinal[7]
49 // kKaon0 : fPIDFinal[8]
50 // kEleCon : fPIDFinal[9]
51 // kUnknown : fPIDFinal[10]
54 // PID[3] is a simple PID for
55 // Electron & Photon PID[0]
63 // --- ROOT system ---
65 // standard C++ includes
66 #include <Riostream.h>
75 #include "TClonesArray.h"
77 #include "TLorentzVector.h"
82 #include "TParticle.h"
85 // #include "AliRun.h"
86 // #include "AliRunLoader.h"
87 // #include "AliHeader.h"
88 // #include "AliLoader.h"
89 // #include "AliStack.h"
90 // #include "AliESDtrack.h"
91 // #include "AliESD.h"
93 #include "AliEMCALPID.h"
97 AliEMCALPID::AliEMCALPID()
101 // Initialize all constant values which have to be used
102 // during PID algorithm execution
105 // set flag for printing to FALSE by default
108 // as a first step, all array elements are initialized to 0.0
110 for (i = 0; i < 6; i++) {
111 for (j = 0; j < 6; j++) {
112 fGamma[i][j] = fHadron[i][j] = fPiZero5to10[i][j] = fPiZero10to60[i][j] = 0.;
116 // then, only the ones which must be not zero are initialized
117 // while the others will remain to the value 0.0
119 fGamma[0][0] = 0.038022;
120 fGamma[0][1] = -0.0001883;
121 fGamma[0][2] = 5.449e-06;
123 fGamma[1][0] = 0.207313;
124 fGamma[1][1] = -0.000978;
125 fGamma[1][2] = 0.00001634;
127 fGamma[2][0] = 0.043364;
128 fGamma[2][1] = -0.0002048;
129 fGamma[2][2] = 8.661e-06;
130 fGamma[2][3] = -1.353e-07;
132 fGamma[3][0] = 0.265004;
133 fGamma[3][1] = 0.061298;
134 fGamma[3][2] = -0.003203;
135 fGamma[3][3] = 4.73e-05;
137 fGamma[4][0] = 0.243579;
138 fGamma[4][1] = -1.614e-05;
140 fGamma[5][0] = 0.002942;
141 fGamma[5][1] = -3.976e-05;
143 fHadron[0][0] = 0.011945 / 3.;
144 fHadron[0][1] = 0.000386 / 3.;
145 fHadron[0][2] = -0.000014 / 3.;
146 fHadron[0][3] = 1.336e-07 / 3.;
148 fHadron[1][0] = 0.496544;
149 fHadron[1][1] = -0.003226;
150 fHadron[1][2] = 0.00001678;
152 fHadron[2][0] = 0.144838;
153 fHadron[2][1] = -0.002954;
154 fHadron[2][2] = 0.00008754;
155 fHadron[2][3] = -7.587e-07;
157 fHadron[3][0] = 1.264461 / 7.;
158 fHadron[3][1] = 0.002097 / 7.;
160 fHadron[4][0] = 0.261950;
161 fHadron[4][1] = -0.001078;
162 fHadron[4][2] = 0.00003237;
163 fHadron[4][3] = -3.241e-07;
166 fHadron[5][0] = 0.010317;
173 fPiZero5to10[0][0] = 0.009138;
174 fPiZero5to10[0][1] = 0.0006377;
176 fPiZero5to10[1][0] = 0.08;
178 fPiZero5to10[2][0] = -0.061119;
179 fPiZero5to10[2][1] = 0.019013;
181 fPiZero5to10[3][0] = 0.2;
183 fPiZero5to10[4][0] = 0.252044;
184 fPiZero5to10[4][1] = -0.002315;
186 fPiZero5to10[5][0] = 0.002942;
187 fPiZero5to10[5][1] = -3.976e-05;
189 fPiZero10to60[0][0] = 0.009138;
190 fPiZero10to60[0][1] = 0.0006377;
192 fPiZero10to60[1][0] = 1.272837;
193 fPiZero10to60[1][1] = -0.069708;
194 fPiZero10to60[1][2] = 0.001568;
195 fPiZero10to60[1][3] = -1.162e-05;
197 fPiZero10to60[2][0] = 0.139703;
198 fPiZero10to60[2][1] = 0.003687;
199 fPiZero10to60[2][2] = -0.000568;
200 fPiZero10to60[2][3] = 1.498e-05;
201 fPiZero10to60[2][4] = -1.174e-07;
203 fPiZero10to60[3][0] = -0.826367;
204 fPiZero10to60[3][1] = 0.096951;
205 fPiZero10to60[3][2] = -0.002215;
206 fPiZero10to60[3][3] = 2.523e-05;
208 fPiZero10to60[4][0] = 0.249890;
209 fPiZero10to60[4][1] = -0.000063;
211 fPiZero10to60[5][0] = 0.002942;
212 fPiZero10to60[5][1] = -3.976e-05;
217 fReconstructor = kFALSE;
221 void AliEMCALPID::RunPID(AliESD *esd)
224 // Make the PID for all the EMCAL clusters containedin the ESDs File
225 // but just gamma/PiO/Hadron
227 // trivial check against NULL object passed
230 AliInfo("NULL ESD object passed!!" );
233 Int_t nClusters = esd->GetNumberOfEMCALClusters();
234 Int_t firstCluster = esd->GetFirstEMCALCluster();
235 Double_t energy, lambda0;
236 for (Int_t iCluster = firstCluster; iCluster < (nClusters + firstCluster); iCluster++) {
238 AliESDCaloCluster *clust = esd->GetCaloCluster(iCluster);
239 energy = clust->GetClusterEnergy();
240 lambda0 = clust->GetM02();
241 // verify cluster type
242 Int_t clusterType= clust->GetClusterType();
243 if (clusterType == AliESDCaloCluster::kClusterv1 && lambda0 != 0 && energy > 5 && energy < 1000) {
244 // reject clusters with lambda0 = 0
245 // reject clusters with energy < 5 GeV
246 ComputePID(energy, lambda0);
248 AliInfo("___________________________________________________");
249 AliInfo(Form( "Particle Energy = %f",energy));
250 AliInfo(Form( "Particle Lambda0 of the particle = %f", lambda0) );
251 AliInfo("PIDWeight of the particle :" );
252 AliInfo(Form( " GAMMA : %f",fPID[0] ));
253 AliInfo(Form( " PiZero : %f",fPID[1] ));
254 AliInfo(Form( " HADRON : %f", fPID[2] ));
255 AliInfo("_________________________________________");
256 AliInfo(Form( " kElectron : %f", fPIDFinal[0]) );
257 AliInfo(Form( " kMuon : %f", fPIDFinal[1] ));
258 AliInfo(Form( " kPion : %f", fPIDFinal[2] ));
259 AliInfo(Form( " kKaon : %f", fPIDFinal[3] ));
260 AliInfo(Form( " kProton : %f", fPIDFinal[4] ));
261 AliInfo(Form( " kPhoton : %f", fPIDFinal[5] ));
262 AliInfo(Form( " kPi0 : %f", fPIDFinal[6] ));
263 AliInfo(Form( " kNeutron : %f", fPIDFinal[7] ));
264 AliInfo(Form( " kKaon0 : %f", fPIDFinal[8] ));
265 AliInfo(Form( " kEleCon : %f", fPIDFinal[9] ));
266 AliInfo(Form( " kUnknown : %f", fPIDFinal[10] ));
267 AliInfo("___________________________________________________");
269 if(fReconstructor) // In case it is called during reconstruction.
270 clust->SetPid(fPIDFinal);
271 } // end if (clusterType...)
272 } // end for (iCluster...)
276 void AliEMCALPID::ComputePID(Double_t energy, Double_t lambda0)
279 // This is the main command, which uses the distributions computed and parametrised,
280 // and gives the PID by the bayesian method.
282 TArrayD paramDistribGamma = DistLambda0(energy, 1);
283 TArrayD paramDistribPiZero = DistLambda0(energy, 2);
284 TArrayD paramDistribHadron = DistLambda0(energy, 3);
286 Bool_t norm = kFALSE;
288 fProbGamma = TMath::Gaus(lambda0, paramDistribGamma[1], paramDistribGamma[2], norm) * paramDistribGamma[0];
289 fProbGamma += TMath::Landau(lambda0, paramDistribGamma[4], paramDistribGamma[5], norm) * paramDistribGamma[3];
290 fProbPiZero = TMath::Gaus(lambda0, paramDistribPiZero[1], paramDistribPiZero[2], norm) * paramDistribPiZero[0];
291 fProbPiZero += TMath::Landau(lambda0, paramDistribPiZero[4], paramDistribPiZero[5], norm) * paramDistribPiZero[3];
292 fProbHadron = TMath::Gaus(lambda0, paramDistribHadron[1], paramDistribHadron[2], norm) * paramDistribHadron[0];
293 fProbHadron += TMath::Landau(lambda0, paramDistribHadron[4], paramDistribHadron[5], norm) * paramDistribHadron[3];
295 // compute PID Weight
296 fPIDWeight[0] = fProbGamma / (fProbGamma + fProbPiZero + fProbHadron);
297 fPIDWeight[1] = fProbPiZero / (fProbGamma+fProbPiZero+fProbHadron);
298 fPIDWeight[2] = fProbHadron / (fProbGamma+fProbPiZero+fProbHadron);
300 SetPID(fPIDWeight[0], 0);
301 SetPID(fPIDWeight[1], 1);
302 SetPID(fPIDWeight[2], 2);
304 // sortie ecran pid Weight only for control (= in english ???)
306 AliInfo(Form( "Energy in loop = %f", energy) );
307 AliInfo(Form( "Lambda0 in loop = %f", lambda0) );
308 AliInfo(Form( "fProbGamma in loop = %f", fProbGamma) );
309 // AliInfo(Form( "fParametresDistribGamma[2] = %f", fParamDistribGamma[2]) );
310 AliInfo(Form( "fProbaPiZero = %f", fProbPiZero ));
311 AliInfo(Form( "fProbaHadron = %f", fProbHadron) );
312 AliInfo(Form( "PIDWeight in loop = %f ||| %f ||| %f", fPIDWeight[0] , fPIDWeight[1], fPIDWeight[2]) );
313 AliInfo(Form( "fGamma[2][2] = %f", fGamma[2][2] ));
314 AliInfo("********************************************************" );
317 fPIDFinal[0] = fPIDWeight[0]/2;
318 fPIDFinal[1] = fPIDWeight[2]/8;
319 fPIDFinal[2] = fPIDWeight[2]/8;
320 fPIDFinal[3] = fPIDWeight[2]/8;
321 fPIDFinal[4] = fPIDWeight[2]/8;
322 fPIDFinal[5] = fPIDWeight[0]/2;
323 fPIDFinal[6] = fPIDWeight[1]/2;
324 fPIDFinal[7] = fPIDWeight[2]/8;
325 fPIDFinal[8] = fPIDWeight[2]/8;
326 fPIDFinal[9] = fPIDWeight[2]/8;
327 fPIDFinal[10] = fPIDWeight[2]/8;
332 TArrayD AliEMCALPID::DistLambda0(Double_t energy, Int_t type)
335 // Compute the values of the parametrised distributions using the data initialised before.
337 Double_t constGauss = 0., meanGauss = 0., sigmaGauss = 0.;
338 Double_t constLandau=0., mpvLandau=0., sigmaLandau=0.;
339 TArrayD distributionParam(6);
343 constGauss = Polynomial(energy, fGamma[0]);
344 meanGauss = Polynomial(energy, fGamma[1]);
345 sigmaGauss = Polynomial(energy, fGamma[2]);
346 constLandau = Polynomial(energy, fGamma[3]);
347 mpvLandau = Polynomial(energy, fGamma[4]);
348 sigmaLandau = Polynomial(energy, fGamma[5]);
352 constGauss = Polynomial(energy, fPiZero5to10[0]);
353 meanGauss = Polynomial(energy, fPiZero5to10[1]);
354 sigmaGauss = Polynomial(energy, fPiZero5to10[2]);
355 constLandau = Polynomial(energy, fPiZero5to10[3]);
356 mpvLandau = Polynomial(energy, fPiZero5to10[4]);
357 sigmaLandau = Polynomial(energy, fPiZero5to10[5]);
360 constGauss = Polynomial(energy, fPiZero10to60[0]);
361 meanGauss = Polynomial(energy, fPiZero10to60[1]);
362 sigmaGauss = Polynomial(energy, fPiZero10to60[2]);
363 constLandau = Polynomial(energy, fPiZero10to60[3]);
364 mpvLandau = Polynomial(energy, fPiZero10to60[4]);
365 sigmaLandau = Polynomial(energy, fPiZero10to60[5]);
369 constGauss = Polynomial(energy, fHadron[0]);
370 meanGauss = Polynomial(energy, fHadron[1]);
371 sigmaGauss = Polynomial(energy, fHadron[2]);
372 constLandau = Polynomial(energy, fHadron[3]);
373 mpvLandau = Polynomial(energy, fHadron[4]);
374 sigmaLandau = Polynomial(energy, fHadron[5]);
378 distributionParam[0] = constGauss;
379 distributionParam[1] = meanGauss;
380 distributionParam[2] = sigmaGauss;
381 distributionParam[3] = constLandau;
382 distributionParam[4] = mpvLandau;
383 distributionParam[5] = sigmaLandau;
385 return distributionParam;
389 Double_t AliEMCALPID::Polynomial(Double_t x, Double_t *params)
392 // Compute a polynomial for a given value of 'x'
393 // with the array of parameters passed as the second arg
398 y += params[2] * x * x;
399 y += params[3] * x * x * x;
400 y += params[4] * x * x * x * x;
401 y += params[5] * x * x * x * x * x;