Including appropriate header
[u/mrichter/AliRoot.git] / PWG4 / PartCorrBase / AliCaloPID.cxx
1 /**************************************************************************
2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3  *                                                                        *
4  * Author: The ALICE Off-line Project.                                    *
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15 /* $Id: AliCaloPID.cxx 21839 2007-10-29 13:49:42Z gustavo $ */
16
17 //_________________________________________________________________________
18 // Class for track/cluster acceptance selection
19 // Selection in Central barrel, EMCAL and PHOS
20 //                
21 //*-- Author: Gustavo Conesa (LNF-INFN) 
22 //////////////////////////////////////////////////////////////////////////////
23
24
25 // --- ROOT system ---
26 #include <TMath.h>
27 #include <TLorentzVector.h>
28 #include <TString.h>
29 #include <TFormula.h>
30
31 //---- ANALYSIS system ----
32 #include "AliLog.h"
33 #include "AliCaloPID.h"
34 #include "AliAODCaloCluster.h"
35 #include "AliAODPWG4Particle.h"
36 #include "AliStack.h"
37 #include "TParticle.h"
38
39 ClassImp(AliCaloPID)
40
41
42 //________________________________________________
43 AliCaloPID::AliCaloPID() : 
44 TObject(), fEMCALPhotonWeight(0.), fEMCALPi0Weight(0.),  
45 fEMCALElectronWeight(0.),  fEMCALChargeWeight(0.),
46 fEMCALNeutralWeight(0.),
47 fPHOSPhotonWeight(0.), fPHOSPi0Weight(0.),  
48 fPHOSElectronWeight(0.), fPHOSChargeWeight(0.) , 
49 fPHOSNeutralWeight(0.), fPHOSWeightFormula(0), 
50 fPHOSPhotonWeightFormula(0x0), fPHOSPi0WeightFormula(0x0),
51 fDispCut(0.),fTOFCut(0.), fDebug(-1), fMCGenerator("")
52 {
53         //Ctor
54         
55         //Initialize parameters
56         InitParameters();
57 }
58
59 //____________________________________________________________________________
60 AliCaloPID::AliCaloPID(const AliCaloPID & pid) :   
61 TObject(pid), fEMCALPhotonWeight(pid.fEMCALPhotonWeight), 
62 fEMCALPi0Weight(pid.fEMCALPi0Weight), 
63 fEMCALElectronWeight(pid.fEMCALElectronWeight), 
64 fEMCALChargeWeight(pid.fEMCALChargeWeight), 
65 fEMCALNeutralWeight(pid.fEMCALNeutralWeight), 
66 fPHOSPhotonWeight(pid.fPHOSPhotonWeight),
67 fPHOSPi0Weight(pid.fPHOSPi0Weight),
68 fPHOSElectronWeight(pid.fPHOSElectronWeight), 
69 fPHOSChargeWeight(pid.fPHOSChargeWeight),
70 fPHOSNeutralWeight(pid.fPHOSNeutralWeight),
71 fPHOSWeightFormula(pid.fPHOSWeightFormula), 
72 fPHOSPhotonWeightFormula(pid.fPHOSPhotonWeightFormula), 
73 fPHOSPi0WeightFormula(pid.fPHOSPi0WeightFormula), 
74 fDispCut(pid.fDispCut),fTOFCut(pid.fTOFCut),
75 fDebug(pid.fDebug),fMCGenerator(pid.fMCGenerator)
76 {
77         // cpy ctor
78         
79 }
80
81 //_________________________________________________________________________
82 AliCaloPID & AliCaloPID::operator = (const AliCaloPID & pid)
83 {
84         // assignment operator
85         
86         if(&pid == this) return *this;
87         
88         fEMCALPhotonWeight = pid. fEMCALPhotonWeight ;
89         fEMCALPi0Weight = pid.fEMCALPi0Weight ;
90         fEMCALElectronWeight = pid.fEMCALElectronWeight; 
91         fEMCALChargeWeight = pid.fEMCALChargeWeight;
92         fEMCALNeutralWeight = pid.fEMCALNeutralWeight;
93         
94         fPHOSPhotonWeight = pid.fPHOSPhotonWeight ;
95         fPHOSPi0Weight = pid.fPHOSPi0Weight ;
96         fPHOSElectronWeight = pid.fPHOSElectronWeight; 
97         fPHOSChargeWeight = pid.fPHOSChargeWeight;
98         fPHOSNeutralWeight = pid.fPHOSNeutralWeight;
99         
100         fPHOSWeightFormula       = pid.fPHOSWeightFormula; 
101         fPHOSPhotonWeightFormula = pid.fPHOSPhotonWeightFormula; 
102         fPHOSPi0WeightFormula    = pid.fPHOSPi0WeightFormula;
103         
104         fDispCut  = pid.fDispCut;
105         fTOFCut   = pid.fTOFCut;
106         fDebug    = pid.fDebug;
107         fMCGenerator = pid.fMCGenerator;
108
109         return *this;
110         
111 }
112
113 //_________________________________
114 AliCaloPID::~AliCaloPID() {
115         //Dtor
116         
117         if(fPHOSPhotonWeightFormula) delete  fPHOSPhotonWeightFormula ;
118         if(fPHOSPi0WeightFormula) delete  fPHOSPi0WeightFormula ;
119         
120 }
121
122
123 //_________________________________________________________________________
124 Int_t AliCaloPID::CheckOrigin(const Int_t label, AliStack * stack) const {
125   //Play with the MC stack if available
126   //Check origin of the candidates, good for PYTHIA
127   
128   if(!stack) AliFatal("Stack is not available, check analysis settings in configuration file, STOP!!");
129   
130   if(label >= 0 && label <  stack->GetNtrack()){
131     //Mother
132     TParticle * mom = stack->Particle(label);
133     Int_t mPdg = TMath::Abs(mom->GetPdgCode());
134     Int_t mStatus =  mom->GetStatusCode() ;
135     Int_t iParent =  mom->GetFirstMother() ;
136     if(fDebug > 0 && label < 8 ) printf("AliCaloPID::CheckOrigin: Mother is parton %d\n",iParent);
137     
138     //GrandParent
139     TParticle * parent = new TParticle ;
140     Int_t pPdg = -1;
141     Int_t pStatus =-1;
142     if(iParent > 0){
143       parent = stack->Particle(iParent);
144       pPdg = TMath::Abs(parent->GetPdgCode());
145       pStatus = parent->GetStatusCode();  
146     }
147     else if(fDebug > 0 ) printf("AliCaloPID::CheckOrigin: Parent with label %d\n",iParent);
148     
149     //return tag
150     if(mPdg == 22){
151       if(mStatus == 1){
152         if(fMCGenerator == "PYTHIA"){
153           if(iParent < 8 && iParent > 5) {//outgoing partons
154             if(pPdg == 22) return kMCPrompt;
155             else  return kMCFragmentation;
156           }//Outgoing partons
157           else if(pStatus == 11){//Decay
158             if(pPdg == 111) return kMCPi0Decay ;
159             else if (pPdg == 321)  return kMCEtaDecay ;
160             else  return kMCOtherDecay ;
161           }//Decay
162           else return kMCISR; //Initial state radiation
163         }//PYTHIA
164
165         else if(fMCGenerator == "HERWIG"){        
166           if(pStatus < 197){//Not decay
167             while(1){
168               if(parent->GetFirstMother()<=5) break;
169               iParent = parent->GetFirstMother();
170               parent=stack->Particle(iParent);
171               pStatus= parent->GetStatusCode();
172               pPdg = parent->GetPdgCode();
173             }//Look for the parton
174             
175             if(iParent < 8 && iParent > 5) {
176               if(pPdg == 22) return kMCPrompt;
177               else  return kMCFragmentation;
178             }
179             return kMCISR;//Initial state radiation
180           }//Not decay
181           else{//Decay
182             if(pPdg == 111) return kMCPi0Decay ;
183             else if (pPdg == 321)  return kMCEtaDecay ;
184             else  return kMCOtherDecay ;
185           }//Decay
186         }//HERWIG
187         else return  kMCUnknown;
188       }//Status 1 : Pythia generated
189       else if(mStatus == 0){
190         if(pPdg ==22 || pPdg ==11) return kMCConversion ;
191         if(pPdg == 111) return kMCPi0Decay ;
192         else if (pPdg == 221)  return kMCEtaDecay ;
193         else  return kMCOtherDecay ;
194       }//status 0 : geant generated
195     }//Mother Photon
196     else if(mPdg == 111)  return kMCPi0 ;
197     else if(mPdg == 221)  return kMCEta ;
198     else if(mPdg ==11){
199       printf("Origin electron, pT %f\n",mom->Pt());
200
201       if(mStatus == 0) return kMCConversion ;
202       else return kMCElectron ;
203     }
204     else return kMCUnknown;
205   }//Good label value
206   else{
207     if(label < 0 ) printf("AliCaloPID::CheckOrigin: *** bad label or no stack ***:  label %d \n", label);
208     if(label >=  stack->GetNtrack()) printf("AliCaloPID::CheckOrigin: *** large label ***:  label %d, n tracks %d \n", label, stack->GetNtrack());
209     return kMCUnknown;
210   }//Bad label
211         
212   return kMCUnknown;
213   
214 }
215
216 //_______________________________________________________________
217 void AliCaloPID::InitParameters()
218 {
219         //Initialize the parameters of the PID.
220         
221         fEMCALPhotonWeight   = 0.8 ;
222         fEMCALPi0Weight      = 0.5 ;
223         fEMCALElectronWeight = 0.8 ;
224         fEMCALChargeWeight   = 0.5 ;
225         fEMCALNeutralWeight  = 0.5 ;
226         
227         fPHOSPhotonWeight    = 0.75 ;
228         fPHOSPi0Weight       = 0.8 ;
229         fPHOSElectronWeight  = 0.5 ;
230         fPHOSChargeWeight    = 0.5 ;
231         fPHOSNeutralWeight   = 0.5 ;
232         
233         //Formula to set the PID weight threshold for photon or pi0
234         fPHOSWeightFormula = kTRUE;
235         fPHOSPhotonWeightFormula = 
236     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))");
237         fPHOSPi0WeightFormula = 
238     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))");
239         
240     fDispCut  = 1.5;
241         fTOFCut   = 5.e-9;
242         fDebug = -1;
243         fMCGenerator = "PYTHIA";
244 }
245
246 //_______________________________________________________________
247 Int_t AliCaloPID::GetPdg(const TString calo, const Double_t * pid, const Float_t energy) const {
248         //Return most probable identity of the particle.
249         
250         if(!pid) AliFatal("pid pointer not initialized!!!");
251         
252         Float_t wPh =  fPHOSPhotonWeight ;
253         Float_t wPi0 =  fPHOSPi0Weight ;
254         Float_t wE =  fPHOSElectronWeight ;
255         Float_t wCh =  fPHOSChargeWeight ;
256         Float_t wNe =  fPHOSNeutralWeight ;
257         
258         
259         if(calo == "PHOS" && fPHOSWeightFormula){
260                 wPh  = fPHOSPhotonWeightFormula->Eval(energy) ;
261                 wPi0 = fPHOSPi0WeightFormula->Eval(energy);
262         }
263         
264         if(calo == "EMCAL"){
265                 
266                 wPh  =  fEMCALPhotonWeight ;
267                 wPi0 =  fEMCALPi0Weight ;
268                 wE   =  fEMCALElectronWeight ;
269                 wCh  =  fEMCALChargeWeight ;
270                 wNe  =  fEMCALNeutralWeight ;
271                 
272         }
273         
274         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",
275                                                    calo.Data(),pid[AliAODCluster::kPhoton], pid[AliAODCluster::kPi0],
276                                                    pid[AliAODCluster::kElectron], pid[AliAODCluster::kEleCon],
277                                                    pid[AliAODCluster::kPion], pid[AliAODCluster::kKaon], pid[AliAODCluster::kProton],
278                                                    pid[AliAODCluster::kNeutron], pid[AliAODCluster::kKaon0]);
279         
280         Int_t pdg = kNeutralUnknown ;
281         Float_t chargedHadronWeight = pid[AliAODCluster::kProton]+pid[AliAODCluster::kKaon]+
282     pid[AliAODCluster::kPion]+pid[AliAODCluster::kMuon];
283         Float_t neutralHadronWeight = pid[AliAODCluster::kNeutron]+pid[AliAODCluster::kKaon0];
284         Float_t allChargedWeight    = pid[AliAODCluster::kElectron]+pid[AliAODCluster::kEleCon]+ chargedHadronWeight;
285         Float_t allNeutralWeight    = pid[AliAODCluster::kPhoton]+pid[AliAODCluster::kPi0]+ neutralHadronWeight;
286         
287         //Select most probable ID
288         if(calo=="PHOS"){
289                 if(pid[AliAODCluster::kPhoton] > wPh) pdg = kPhoton ;
290                 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ; 
291                 else if(pid[AliAODCluster::kElectron] > wE)  pdg = kElectron ;
292                 else if(pid[AliAODCluster::kEleCon] >  wE) pdg = kEleCon ;
293                 else if(chargedHadronWeight > wCh) pdg = kChargedHadron ;  
294                 else if(neutralHadronWeight > wNe) pdg = kNeutralHadron ; 
295                 else if(allChargedWeight >  allNeutralWeight)
296                         pdg = kChargedUnknown ; 
297                 else 
298                         pdg = kNeutralUnknown ;
299         }
300         else{//EMCAL
301                 if(pid[AliAODCluster::kPhoton]  > wPh) pdg = kPhoton ;
302                 else if(pid[AliAODCluster::kPi0] > wPi0) pdg = kPi0 ; 
303                 else if(pid[AliAODCluster::kElectron]  > wE) pdg = kElectron ;
304                 else if(chargedHadronWeight + neutralHadronWeight > wCh) pdg = kChargedHadron ;  
305                 else if(neutralHadronWeight + chargedHadronWeight > wNe) pdg = kNeutralHadron ; 
306                 else pdg =  kNeutralUnknown ;
307                 
308         }
309         
310         
311         if(fDebug > 0)printf("AliCaloPID::GetPdg:Final Pdg: %d \n", pdg);
312         
313         
314         
315         return pdg ;
316         
317 }
318
319 //_______________________________________________________________
320 Int_t AliCaloPID::GetPdg(const TString calo,const TLorentzVector mom, const AliAODCaloCluster * cluster) const {
321         //Recalculated PID with all parameters
322         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",
323                                                  calo.Data(),mom.E(),cluster->GetM02(),cluster->GetM20(),cluster->GetDispersion(),cluster->GetTOF(), 
324                                                  cluster->GetEmcCpvDistance(), cluster->GetDistToBadChannel(),cluster->GetNExMax());
325         
326         if(calo == "EMCAL") {
327                 if(cluster->GetM02()< 0.25) return kPhoton ;
328                 else return  kNeutralHadron ; 
329         }
330         
331         //   if(calo == "PHOS") {
332         //    if(cluster->GetM02()< 0.25) return kPhoton ;
333         //    else return  kNeutralHadron ; 
334         //  }
335         
336         return  kNeutralHadron ; 
337         
338 }
339
340 //__________________________________________________
341 TString  AliCaloPID::GetPIDParametersList()  {
342         //Put data member values in string to keep in output container
343         
344         TString parList ; //this will be list of parameters used for this analysis.
345         char onePar[255] ;
346         sprintf(onePar,"--- AliCaloPID ---\n") ;
347         parList+=onePar ;       
348         sprintf(onePar,"fDispCut =%2.2f (Cut on dispersion, used in PID evaluation) \n",fDispCut) ;
349         parList+=onePar ;
350         sprintf(onePar,"fTOFCut  =%e (Cut on TOF, used in PID evaluation) \n",fTOFCut) ;
351         parList+=onePar ;
352         sprintf(onePar,"fEMCALPhotonWeight =%2.2f (EMCAL bayesian weight for photons)\n",fEMCALPhotonWeight) ;
353         parList+=onePar ;
354         sprintf(onePar,"fEMCALPi0Weight =%2.2f (EMCAL bayesian weight for pi0)\n",fEMCALPi0Weight) ;
355         parList+=onePar ;
356         sprintf(onePar,"fEMCALElectronWeight =%2.2f(EMCAL bayesian weight for electrons)\n",fEMCALElectronWeight) ;
357         parList+=onePar ;
358         sprintf(onePar,"fEMCALChargeWeight =%2.2f (EMCAL bayesian weight for charged hadrons)\n",fEMCALChargeWeight) ;
359         parList+=onePar ;
360         sprintf(onePar,"fEMCALNeutralWeight =%2.2f (EMCAL bayesian weight for neutral hadrons)\n",fEMCALNeutralWeight) ;
361         parList+=onePar ;
362         sprintf(onePar,"fPHOSPhotonWeight =%2.2f (PHOS bayesian weight for photons)\n",fPHOSPhotonWeight) ;
363         parList+=onePar ;
364         sprintf(onePar,"fPHOSPi0Weight =%2.2f (PHOS bayesian weight for pi0)\n",fPHOSPi0Weight) ;
365         parList+=onePar ;
366         sprintf(onePar,"fPHOSElectronWeight =%2.2f(PHOS bayesian weight for electrons)\n",fPHOSElectronWeight) ;
367         parList+=onePar ;
368         sprintf(onePar,"fPHOSChargeWeight =%2.2f (PHOS bayesian weight for charged hadrons)\n",fPHOSChargeWeight) ;
369         parList+=onePar ;
370         sprintf(onePar,"fPHOSNeutralWeight =%2.2f (PHOS bayesian weight for neutral hadrons)\n",fPHOSNeutralWeight) ;
371         parList+=onePar ;
372         
373         if(fPHOSWeightFormula){
374                 parList+="PHOS Photon Weight Formula: "+(fPHOSPhotonWeightFormula->GetExpFormula("p"));
375                 parList+="PHOS Pi0    Weight Formula: "+(fPHOSPi0WeightFormula->GetExpFormula("p"));
376         }
377         
378         return parList; 
379         
380 }
381
382 //________________________________________________________________
383 void AliCaloPID::Print(const Option_t * opt) const
384 {
385         
386         //Print some relevant parameters set for the analysis
387         if(! opt)
388                 return;
389         
390         printf("***** Print: %s %s ******\n", GetName(), GetTitle() ) ;
391         
392         printf("PHOS PID weight , photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f \n",  
393                    fPHOSPhotonWeight,  fPHOSPi0Weight, 
394                    fPHOSElectronWeight,  fPHOSChargeWeight,   fPHOSNeutralWeight) ; 
395         printf("EMCAL PID weight, photon %0.2f, pi0 %0.2f, e %0.2f, charge %0.2f, neutral %0.2f\n",   
396                    fEMCALPhotonWeight,  fEMCALPi0Weight, 
397                    fEMCALElectronWeight,  fEMCALChargeWeight,  fEMCALNeutralWeight) ; 
398         
399         printf("PHOS Parametrized weight on?  =     %d\n",  fPHOSWeightFormula) ; 
400         if(fPHOSWeightFormula){
401                 printf("Photon weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
402                 printf("Pi0    weight formula = %s\n", (fPHOSPhotonWeightFormula->GetExpFormula("p")).Data());
403     }
404         
405         printf("TOF cut        = %e\n",fTOFCut);
406         printf("Dispersion cut = %2.2f\n",fDispCut);
407         printf("Debug level    = %d\n",fDebug);
408         printf("MC Generator   = %s\n",fMCGenerator.Data());
409
410         printf(" \n");
411         
412
413
414 //_______________________________________________________________
415 void AliCaloPID::SetPIDBits(const TString calo, const AliAODCaloCluster * cluster, AliAODPWG4Particle * ph) {
416         //Set Bits for PID selection
417         
418         //Dispersion/lambdas
419     Double_t disp=cluster->GetDispersion()  ;
420         //    Double_t m20=calo->GetM20() ;
421         //    Double_t m02=calo->GetM02() ; 
422     ph->SetDispBit(disp<fDispCut) ;  
423         
424     //TOF
425     Double_t tof=cluster->GetTOF()  ;
426     ph->SetTOFBit(TMath::Abs(tof)<fTOFCut) ; 
427         
428     //Charged veto
429         //    Double_t cpvR=calo->GetEmcCpvDistance() ; 
430     Int_t ntr=cluster->GetNTracksMatched();  //number of track matched
431     ph->SetChargedBit(ntr>0) ;  //Temporary cut, should we evaluate distance?
432         
433     //Set PID pdg
434         ph->SetPdg(GetPdg(calo,cluster->PID(),ph->E()));
435         
436         if(fDebug > 0){ 
437                 printf("AliCaloPID::SetPIDBits: TOF %e, Dispersion %2.2f, NTracks %d\n",tof , disp, ntr);       
438                 printf("AliCaloPID::SetPIDBits: pdg %d, bits: TOF %d, Dispersion %d, Charge %d\n",
439                            ph->GetPdg(), ph->GetTOFBit() , ph->GetDispBit() , ph->GetChargedBit()); 
440         }
441 }
442
443