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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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14 **************************************************************************/
15 /* $Id: AliCaloPID.cxx 21839 2007-10-29 13:49:42Z gustavo $ */
17 //_________________________________________________________________________
18 // Class for PID selection with calorimeters
19 // The Output of the 2 main methods GetPdg is a PDG number identifying the cluster,
20 // being kPhoton, kElectron, kPi0 ... as defined in the header file
21 // - GetPdg(const TString calo, const Double_t * pid, const Float_t energy)
22 // Reads the PID weights array of the ESDs and depending on its magnitude identifies the particle
23 // - GetPdg(const TString calo,const TLorentzVector mom, const AliAODCaloCluster * cluster)
24 // Recalcultes PID, the bayesian or any new one to be implemented in the future
25 // Right now only the possibility to recalculate EMCAL with bayesian and simple PID.
26 // In order to recalculate Bayesian, it is necessary to load the EMCALUtils library
27 // and do SwitchOnBayesianRecalculation().
28 // To change the PID parameters from Low to High like the ones by default, use the constructor
30 // where flux is AliCaloPID::kLow or AliCaloPID::kHigh
31 // If it is necessary to change the parameters use the constructor
32 // AliCaloPID(AliEMCALPIDUtils *utils) and set the parameters before.
33 // - SetPIDBits: Simple PID, depending on the thresholds fDispCut fTOFCut and even the
34 // result of the PID bayesian a different PID bit is set.
36 // All these methods can be called in the analysis you are interested.
38 //*-- Author: Gustavo Conesa (LNF-INFN)
39 //////////////////////////////////////////////////////////////////////////////
42 // --- ROOT system ---
47 //---- ANALYSIS system ----
48 #include "AliCaloPID.h"
49 #include "AliAODCaloCluster.h"
50 #include "AliAODPWG4Particle.h"
51 #include "AliEMCALPIDUtils.h"
55 //________________________________________________
56 AliCaloPID::AliCaloPID() :
57 TObject(), fEMCALPhotonWeight(0.), fEMCALPi0Weight(0.),
58 fEMCALElectronWeight(0.), fEMCALChargeWeight(0.),
59 fEMCALNeutralWeight(0.),
60 fPHOSPhotonWeight(0.), fPHOSPi0Weight(0.),
61 fPHOSElectronWeight(0.), fPHOSChargeWeight(0.) ,
62 fPHOSNeutralWeight(0.), fPHOSWeightFormula(0),
63 fPHOSPhotonWeightFormula(0x0), fPHOSPi0WeightFormula(0x0),
64 fDispCut(0.),fTOFCut(0.), fDebug(-1),
65 fRecalculateBayesian(kFALSE), fParticleFlux(kLow), fEMCALPIDUtils(new AliEMCALPIDUtils)
69 //Initialize parameters
73 //________________________________________________
74 AliCaloPID::AliCaloPID(const Int_t flux) :
75 TObject(), fEMCALPhotonWeight(0.), fEMCALPi0Weight(0.),
76 fEMCALElectronWeight(0.), fEMCALChargeWeight(0.),
77 fEMCALNeutralWeight(0.),
78 fPHOSPhotonWeight(0.), fPHOSPi0Weight(0.),
79 fPHOSElectronWeight(0.), fPHOSChargeWeight(0.) ,
80 fPHOSNeutralWeight(0.), fPHOSWeightFormula(0),
81 fPHOSPhotonWeightFormula(0x0), fPHOSPi0WeightFormula(0x0),
82 fDispCut(0.),fTOFCut(0.), fDebug(-1),
83 fRecalculateBayesian(kTRUE), fParticleFlux(flux), fEMCALPIDUtils(new AliEMCALPIDUtils)
87 //Initialize parameters
91 //________________________________________________
92 AliCaloPID::AliCaloPID(const TTask * emcalpid) :
93 TObject(), fEMCALPhotonWeight(0.), fEMCALPi0Weight(0.),
94 fEMCALElectronWeight(0.), fEMCALChargeWeight(0.),
95 fEMCALNeutralWeight(0.),
96 fPHOSPhotonWeight(0.), fPHOSPi0Weight(0.),
97 fPHOSElectronWeight(0.), fPHOSChargeWeight(0.) ,
98 fPHOSNeutralWeight(0.), fPHOSWeightFormula(0),
99 fPHOSPhotonWeightFormula(0x0), fPHOSPi0WeightFormula(0x0),
100 fDispCut(0.),fTOFCut(0.), fDebug(-1),
101 fRecalculateBayesian(kTRUE), fParticleFlux(-1), fEMCALPIDUtils( (AliEMCALPIDUtils*) emcalpid)
105 //Initialize parameters
109 //____________________________________________________________________________
110 AliCaloPID::AliCaloPID(const AliCaloPID & pid) :
111 TObject(pid), fEMCALPhotonWeight(pid.fEMCALPhotonWeight),
112 fEMCALPi0Weight(pid.fEMCALPi0Weight),
113 fEMCALElectronWeight(pid.fEMCALElectronWeight),
114 fEMCALChargeWeight(pid.fEMCALChargeWeight),
115 fEMCALNeutralWeight(pid.fEMCALNeutralWeight),
116 fPHOSPhotonWeight(pid.fPHOSPhotonWeight),
117 fPHOSPi0Weight(pid.fPHOSPi0Weight),
118 fPHOSElectronWeight(pid.fPHOSElectronWeight),
119 fPHOSChargeWeight(pid.fPHOSChargeWeight),
120 fPHOSNeutralWeight(pid.fPHOSNeutralWeight),
121 fPHOSWeightFormula(pid.fPHOSWeightFormula),
122 fPHOSPhotonWeightFormula(pid.fPHOSPhotonWeightFormula),
123 fPHOSPi0WeightFormula(pid.fPHOSPi0WeightFormula),
124 fDispCut(pid.fDispCut),fTOFCut(pid.fTOFCut),
125 fDebug(pid.fDebug), fRecalculateBayesian(pid.fRecalculateBayesian),
126 fParticleFlux(pid.fParticleFlux), fEMCALPIDUtils(pid.fEMCALPIDUtils)
132 //_________________________________________________________________________
133 AliCaloPID & AliCaloPID::operator = (const AliCaloPID & pid)
135 // assignment operator
137 if(&pid == this) return *this;
139 fEMCALPhotonWeight = pid. fEMCALPhotonWeight ;
140 fEMCALPi0Weight = pid.fEMCALPi0Weight ;
141 fEMCALElectronWeight = pid.fEMCALElectronWeight;
142 fEMCALChargeWeight = pid.fEMCALChargeWeight;
143 fEMCALNeutralWeight = pid.fEMCALNeutralWeight;
145 fPHOSPhotonWeight = pid.fPHOSPhotonWeight ;
146 fPHOSPi0Weight = pid.fPHOSPi0Weight ;
147 fPHOSElectronWeight = pid.fPHOSElectronWeight;
148 fPHOSChargeWeight = pid.fPHOSChargeWeight;
149 fPHOSNeutralWeight = pid.fPHOSNeutralWeight;
151 fPHOSWeightFormula = pid.fPHOSWeightFormula;
152 fPHOSPhotonWeightFormula = pid.fPHOSPhotonWeightFormula;
153 fPHOSPi0WeightFormula = pid.fPHOSPi0WeightFormula;
155 fDispCut = pid.fDispCut;
156 fTOFCut = pid.fTOFCut;
159 fRecalculateBayesian = pid.fRecalculateBayesian;
160 fParticleFlux = pid.fParticleFlux;
161 fEMCALPIDUtils = pid.fEMCALPIDUtils;
167 //_________________________________
168 AliCaloPID::~AliCaloPID() {
171 if(fPHOSPhotonWeightFormula) delete fPHOSPhotonWeightFormula ;
172 if(fPHOSPi0WeightFormula) delete fPHOSPi0WeightFormula ;
173 if(fEMCALPIDUtils) delete fEMCALPIDUtils ;
177 //_______________________________________________________________
178 void AliCaloPID::InitParameters()
180 //Initialize the parameters of the PID.
182 fEMCALPhotonWeight = 0.5 ;
183 fEMCALPi0Weight = 0.5 ;
184 fEMCALElectronWeight = 0.5 ;
185 fEMCALChargeWeight = 0.5 ;
186 fEMCALNeutralWeight = 0.5 ;
188 fPHOSPhotonWeight = 0.5 ;
189 fPHOSPi0Weight = 0.5 ;
190 fPHOSElectronWeight = 0.5 ;
191 fPHOSChargeWeight = 0.5 ;
192 fPHOSNeutralWeight = 0.5 ;
194 //Formula to set the PID weight threshold for photon or pi0
195 fPHOSWeightFormula = kTRUE;
196 fPHOSPhotonWeightFormula =
197 new TFormula("photonWeight","0.98*(x<40)+ 0.68*(x>=100)+(x>=40 && x<100)*(0.98+x*(6e-3)-x*x*(2e-04)+x*x*x*(1.1e-06))");
198 fPHOSPi0WeightFormula =
199 new TFormula("pi0Weight","0.98*(x<65)+ 0.915*(x>=100)+(x>=65 && x-x*(1.95e-3)-x*x*(4.31e-05)+x*x*x*(3.61e-07))");
205 if(fRecalculateBayesian){
206 if(fParticleFlux == kLow){
207 printf("AliCaloPID::Init() - SetLOWFluxParam\n");
208 fEMCALPIDUtils->SetLowFluxParam() ;
210 else if (fParticleFlux == kHigh){
211 printf("AliCaloPID::Init() - SetHIGHFluxParam\n");
212 fEMCALPIDUtils->SetHighFluxParam() ;
217 //_______________________________________________________________
218 Int_t AliCaloPID::GetPdg(const TString calo, const Double_t * pid, const Float_t energy) const {
219 //Return most probable identity of the particle.
222 printf("AliCaloPID::GetPdg() - pid pointer not initialized!!!\n");
226 Float_t wPh = fPHOSPhotonWeight ;
227 Float_t wPi0 = fPHOSPi0Weight ;
228 Float_t wE = fPHOSElectronWeight ;
229 Float_t wCh = fPHOSChargeWeight ;
230 Float_t wNe = fPHOSNeutralWeight ;
233 if(calo == "PHOS" && fPHOSWeightFormula){
234 wPh = fPHOSPhotonWeightFormula->Eval(energy) ;
235 wPi0 = fPHOSPi0WeightFormula->Eval(energy);
240 wPh = fEMCALPhotonWeight ;
241 wPi0 = fEMCALPi0Weight ;
242 wE = fEMCALElectronWeight ;
243 wCh = fEMCALChargeWeight ;
244 wNe = fEMCALNeutralWeight ;
248 if(fDebug > 0) printf("AliCaloPID::GetPdg: calo %s, ph %0.2f, pi0 %0.2f, el %0.2f, conv el %0.2f, hadrons: pion %0.2f, kaon %0.2f, proton %0.2f , neutron %0.2f, kaon %0.2f \n",
249 calo.Data(),pid[AliAODCluster::kPhoton], pid[AliAODCluster::kPi0],
250 pid[AliAODCluster::kElectron], pid[AliAODCluster::kEleCon],
251 pid[AliAODCluster::kPion], pid[AliAODCluster::kKaon], pid[AliAODCluster::kProton],
252 pid[AliAODCluster::kNeutron], pid[AliAODCluster::kKaon0]);
254 Int_t pdg = kNeutralUnknown ;
255 Float_t chargedHadronWeight = pid[AliAODCluster::kProton]+pid[AliAODCluster::kKaon]+
256 pid[AliAODCluster::kPion]+pid[AliAODCluster::kMuon];
257 Float_t neutralHadronWeight = pid[AliAODCluster::kNeutron]+pid[AliAODCluster::kKaon0];
258 Float_t allChargedWeight = pid[AliAODCluster::kElectron]+pid[AliAODCluster::kEleCon]+ chargedHadronWeight;
259 Float_t allNeutralWeight = pid[AliAODCluster::kPhoton]+pid[AliAODCluster::kPi0]+ neutralHadronWeight;
261 //Select most probable ID
263 if(pid[AliAODCluster::kPhoton] > wPh) pdg = kPhoton ;
264 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ;
265 else if(pid[AliAODCluster::kElectron] > wE) pdg = kElectron ;
266 else if(pid[AliAODCluster::kEleCon] > wE) pdg = kEleCon ;
267 else if(chargedHadronWeight > wCh) pdg = kChargedHadron ;
268 else if(neutralHadronWeight > wNe) pdg = kNeutralHadron ;
269 else if(allChargedWeight > allNeutralWeight)
270 pdg = kChargedUnknown ;
272 pdg = kNeutralUnknown ;
276 if(pid[AliAODCluster::kPhoton]+pid[AliAODCluster::kElectron] > wPh) pdg = kPhoton ; //temporal sollution until track matching for electrons is considered
277 //if(pid[AliAODCluster::kPhoton] > wPh) pdg = kPhoton ;
278 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ;
279 //else if(pid[AliAODCluster::kElectron] > wE) pdg = kElectron ;
280 else if(chargedHadronWeight + neutralHadronWeight > wCh) pdg = kChargedHadron ;
281 else if(neutralHadronWeight + chargedHadronWeight > wNe) pdg = kNeutralHadron ;
282 else pdg = kNeutralUnknown ;
286 if(fDebug > 0)printf("AliCaloPID::GetPdg:Final Pdg: %d \n", pdg);
292 //_______________________________________________________________
293 Int_t AliCaloPID::GetPdg(const TString calo,const TLorentzVector mom, const AliAODCaloCluster * cluster) const {
294 //Recalculated PID with all parameters
295 Float_t lambda0 = cluster->GetM02();
296 Float_t energy = mom.E();
298 if(fDebug > 0) printf("AliCaloPID::GetPdg: Calorimeter %s, E %3.2f, l0 %3.2f, l1 %3.2f, disp %3.2f, tof %1.11f, distCPV %3.2f, distToBC %1.1f, NMax %d\n",
299 calo.Data(),energy,lambda0,cluster->GetM20(),cluster->GetDispersion(),cluster->GetTOF(),
300 cluster->GetEmcCpvDistance(), cluster->GetDistToBadChannel(),cluster->GetNExMax());
302 if(calo == "EMCAL") {
303 //Recalculate Bayesian
304 if(fRecalculateBayesian){
306 const Double_t *pid0 = cluster->PID();
307 printf("AliCaloPID::GetPdg: BEFORE calo %s, ph %0.2f, pi0 %0.2f, el %0.2f, conv el %0.2f, hadrons: pion %0.2f, kaon %0.2f, proton %0.2f , neutron %0.2f, kaon %0.2f \n",
308 calo.Data(),pid0[AliAODCluster::kPhoton], pid0[AliAODCluster::kPi0],
309 pid0[AliAODCluster::kElectron], pid0[AliAODCluster::kEleCon],
310 pid0[AliAODCluster::kPion], pid0[AliAODCluster::kKaon], pid0[AliAODCluster::kProton],
311 pid0[AliAODCluster::kNeutron], pid0[AliAODCluster::kKaon0]);
314 fEMCALPIDUtils->ComputePID(energy, lambda0);
315 Double_t pid[AliPID::kSPECIESN];
316 for(Int_t i = 0; i < AliPID::kSPECIESN; i++) pid[i] = fEMCALPIDUtils->GetPIDFinal(i);
317 return GetPdg(calo, pid, energy);
322 // If no use of bayesian, simple PID
323 if(lambda0 < 0.25) return kPhoton ;
324 //else return kNeutralHadron ;
328 // if(calo == "PHOS") {
329 // if(cluster->GetM02()< 0.25) return kPhoton ;
330 // else return kNeutralHadron ;
333 return kNeutralHadron ;
337 //__________________________________________________
338 TString AliCaloPID::GetPIDParametersList() {
339 //Put data member values in string to keep in output container
341 TString parList ; //this will be list of parameters used for this analysis.
343 sprintf(onePar,"--- AliCaloPID ---\n") ;
345 sprintf(onePar,"fDispCut =%2.2f (Cut on dispersion, used in PID evaluation) \n",fDispCut) ;
347 sprintf(onePar,"fTOFCut =%e (Cut on TOF, used in PID evaluation) \n",fTOFCut) ;
349 sprintf(onePar,"fEMCALPhotonWeight =%2.2f (EMCAL bayesian weight for photons)\n",fEMCALPhotonWeight) ;
351 sprintf(onePar,"fEMCALPi0Weight =%2.2f (EMCAL bayesian weight for pi0)\n",fEMCALPi0Weight) ;
353 sprintf(onePar,"fEMCALElectronWeight =%2.2f(EMCAL bayesian weight for electrons)\n",fEMCALElectronWeight) ;
355 sprintf(onePar,"fEMCALChargeWeight =%2.2f (EMCAL bayesian weight for charged hadrons)\n",fEMCALChargeWeight) ;
357 sprintf(onePar,"fEMCALNeutralWeight =%2.2f (EMCAL bayesian weight for neutral hadrons)\n",fEMCALNeutralWeight) ;
359 sprintf(onePar,"fPHOSPhotonWeight =%2.2f (PHOS bayesian weight for photons)\n",fPHOSPhotonWeight) ;
361 sprintf(onePar,"fPHOSPi0Weight =%2.2f (PHOS bayesian weight for pi0)\n",fPHOSPi0Weight) ;
363 sprintf(onePar,"fPHOSElectronWeight =%2.2f(PHOS bayesian weight for electrons)\n",fPHOSElectronWeight) ;
365 sprintf(onePar,"fPHOSChargeWeight =%2.2f (PHOS bayesian weight for charged hadrons)\n",fPHOSChargeWeight) ;
367 sprintf(onePar,"fPHOSNeutralWeight =%2.2f (PHOS bayesian weight for neutral hadrons)\n",fPHOSNeutralWeight) ;
370 if(fPHOSWeightFormula){
371 sprintf(onePar,"PHOS Photon Weight Formula: %s\n",(fPHOSPhotonWeightFormula->GetExpFormula("p")).Data()) ;
373 sprintf(onePar,"PHOS Pi0 Weight Formula: %s\n",(fPHOSPi0WeightFormula->GetExpFormula("p")).Data()) ;
381 //________________________________________________________________
382 void AliCaloPID::Print(const Option_t * opt) const
385 //Print some relevant parameters set for the analysis
389 printf("***** Print: %s %s ******\n", GetName(), GetTitle() ) ;
391 printf("PHOS PID weight , photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f \n",
392 fPHOSPhotonWeight, fPHOSPi0Weight,
393 fPHOSElectronWeight, fPHOSChargeWeight, fPHOSNeutralWeight) ;
394 printf("EMCAL PID weight, photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f\n",
395 fEMCALPhotonWeight, fEMCALPi0Weight,
396 fEMCALElectronWeight, fEMCALChargeWeight, fEMCALNeutralWeight) ;
398 printf("PHOS Parametrized weight on? = %d\n", fPHOSWeightFormula) ;
399 if(fPHOSWeightFormula){
400 printf("Photon weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
401 printf("Pi0 weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
404 printf("TOF cut = %e\n",fTOFCut);
405 printf("Dispersion cut = %2.2f\n",fDispCut);
406 printf("Debug level = %d\n",fDebug);
407 printf("Recalculate Bayesian? = %d\n",fRecalculateBayesian);
408 if(fRecalculateBayesian) printf("Particle Flux? = %d\n",fParticleFlux);
413 //_______________________________________________________________
414 void AliCaloPID::SetPIDBits(const TString calo, const AliAODCaloCluster * cluster, AliAODPWG4Particle * ph) {
415 //Set Bits for PID selection
418 Double_t disp=cluster->GetDispersion() ;
419 // Double_t m20=calo->GetM20() ;
420 // Double_t m02=calo->GetM02() ;
421 ph->SetDispBit(disp<fDispCut) ;
424 Double_t tof=cluster->GetTOF() ;
425 ph->SetTOFBit(TMath::Abs(tof)<fTOFCut) ;
428 // Double_t cpvR=calo->GetEmcCpvDistance() ;
429 Int_t ntr=cluster->GetNTracksMatched(); //number of track matched
430 ph->SetChargedBit(ntr>0) ; //Temporary cut, should we evaluate distance?
433 ph->SetPdg(GetPdg(calo,cluster->PID(),ph->E()));
436 printf("AliCaloPID::SetPIDBits: TOF %e, Dispersion %2.2f, NTracks %d\n",tof , disp, ntr);
437 printf("AliCaloPID::SetPIDBits: pdg %d, bits: TOF %d, Dispersion %d, Charge %d\n",
438 ph->GetPdg(), ph->GetTOFBit() , ph->GetDispBit() , ph->GetChargedBit());