1 #include "AliRICHTracker.h"
6 #include "AliRICHHelix.h"
8 #include "AliRICHRecon.h"
10 #include <TParticle.h>
12 ClassImp(AliRICHTracker)
13 //__________________________________________________________________________________________________
14 Int_t AliRICHTracker::PropagateBack(AliESD *pESD)
16 // Interface callback methode invoked by AliRecontruction during tracking after TOF
17 // It steers to different way to provide the final reconstructed information sutable for analisys:
18 // 1. AliESD - reconstructed tracks are used
19 // 2. RICH private ntuple for debug- stack particles used instead of reconstructed tracks
20 AliDebug(1,"Start pattern recognition");
21 if(pESD->GetNumberOfTracks())
25 AliDebug(1,"Stop pattern recognition");
27 return 0; // error code: 0=no error;
29 //__________________________________________________________________________________________________
30 void AliRICHTracker::RecWithESD(AliESD *pESD)
32 //recontruction from ESD
34 Int_t iNtracks=pESD->GetNumberOfTracks();
35 Double_t b=GetFieldMap()->SolenoidField()/10;// magnetic field in Tesla
36 AliDebug(1,Form("Start with %i tracks in %f Tesla field",iNtracks,b));
37 Double_t xb[3],pb[3];//tmp storage for track parameters
38 TVector3 x0(0,0,0); TVector3 p0(0,0,0);//tmp storage for AliRICHHelix
40 AliRICH *pRich=((AliRICH*)gAlice->GetDetector("RICH"));
42 for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//ESD tracks loop
43 AliESDtrack *pTrack = pESD->GetTrack(iTrackN);// get next reconstructed track
44 // if((pTrack->GetStatus()&AliESDtrack::kTOFout)==0) continue; //ignore tracks not recontructed by TOF
46 pTrack->GetPxPyPz(pb);
47 Int_t status=pTrack->GetStatus()&AliESDtrack::kTOFout;//get running track parameters
48 Int_t charge = (Int_t)(-TMath::Sign(1.,pTrack->GetSign()*b));
49 AliDebug(1,Form("Track %i pmod=%f charge=%i stat=%i",iTrackN,pTrack->GetP(),charge,status));
50 x0.SetXYZ(xb[0],xb[1],xb[2]); p0.SetXYZ(pb[0],pb[1],pb[2]);
51 AliRICHHelix helix(x0,p0,charge,b);
52 Int_t iChamber=helix.RichIntersect(pRich->P());
53 AliDebug(1,Form("intersection with %i chamber found",iChamber));
54 if(!iChamber) continue;//intersection with no chamber found
56 Double_t distMip=9999; //min distance between clusters and track position on PC
57 Int_t iMipId=0; //index of that min distance cluster
58 for(Int_t iClusN=0;iClusN<pRich->Clusters(iChamber)->GetEntries();iClusN++){//clusters loop for intersected chamber
59 AliRICHcluster *pClus=(AliRICHcluster*)pRich->Clusters(iChamber)->UncheckedAt(iClusN);//get pointer to current cluster
60 Double_t distCurrent=pClus->DistTo(helix.PosPc());//ditance between current cluster and helix intersection with PC
61 if(distCurrent<distMip){
64 }//find cluster nearest to the track
65 AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(),
66 helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc())));
67 }//clusters loop for intersected chamber
69 AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip));
71 AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId); //create reconstruction object for helix, list of clusters
72 Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track
73 AliDebug(1,Form("FINAL Theta Cerenkov=%f",thetaCerenkov));
74 pTrack->SetRICHsignal(thetaCerenkov);
76 // Double_t richPID[5]={0.2,0.2,0.2,0.2,0.2}; //start with equal probs for (e,mu,pi,k,p)
77 // CalcProb(thetaCerenkov,p0.Mag(),richPID);
78 // pTrack->SetRICHpid(richPID);
83 //__________________________________________________________________________________________________
84 void AliRICHTracker::RecWithStack(TNtupleD *hn)
86 // Reconstruction for particles from STACK
87 AliRICH *pRich=((AliRICH*)gAlice->GetDetector("RICH"));
89 // pRich->GetLoader()->GetRunLoader()->LoadHeader();
90 pRich->GetLoader()->GetRunLoader()->LoadKinematics();
91 AliStack *pStack = pRich->GetLoader()->GetRunLoader()->Stack();
92 if(!pStack) {AliDebug(1,Form("No STACK found in AliRoot"));return;}
93 Int_t iNtracks=pStack->GetNtrack();
94 AliDebug(1,Form(" Start reconstruction with %i track(s) from Stack",iNtracks));
98 Double_t b=GetFieldMap()->SolenoidField()/10;// magnetic field in Tesla
99 AliDebug(1,Form("Start with simulated %i tracks in %f Tesla field",iNtracks,b));
100 TVector3 x0(0,0,0); TVector3 p0(0,0,0);//tmp storage for AliRICHHelix
103 if(pRich->GetLoader()->LoadRecPoints()) {AliDebug(1,Form("No clusters found in RICH"));return;}
104 pRich->GetLoader()->TreeR()->GetEntry(0);
106 for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//stack particles loop
107 TParticle *pParticle = pStack->Particle(iTrackN);
108 if(!pParticle) {AliDebug(1,Form("Not a valid TParticle pointer. Track skipped"));continue;}
109 AliDebug(1,Form(" PDG code : %i",pParticle->GetPdgCode()));
111 // problem of PDG code of some extra particles to be solved!!!!!!!!!
113 // found problem! Look in TRD directory : codes from Fluka are :
115 // if ((pdg_code == 10010020) ||
116 // (pdg_code == 10010030) ||
117 // (pdg_code == 50000050) ||
118 // (pdg_code == 50000051) ||
119 // (pdg_code == 10020040)) {
121 if(pParticle->GetPdgCode()>=50000050||pParticle->GetPdgCode()==0||pParticle->GetPdgCode()>10000) {AliDebug(1,Form("A photon as track... Track skipped"));continue;}
123 // to be updated for us!!
125 AliDebug(1,Form("Track %i is a %s with charge %i and momentum %f",
126 iTrackN,pParticle->GetPDG()->GetName(),Int_t(pParticle->GetPDG()->Charge()),pParticle->P()));
127 // if(pParticle->GetMother(0)!=-1) continue; //consider only primaries
128 if(pParticle->GetPDG()->Charge()==0||TMath::Abs(Int_t(pParticle->GetPDG()->Charge()))!=3) continue; //to avoid photons from stack...
129 hnvec[0]=pParticle->P();
130 hnvec[1]=pParticle->GetPDG()->Charge();
131 hnvec[2]=pParticle->Theta();
132 hnvec[3]=pParticle->Phi();
133 p0.SetMagThetaPhi(pParticle->P(),pParticle->Theta(),pParticle->Phi());
134 x0.SetXYZ(pParticle->Vx(),pParticle->Vy(),pParticle->Vz());
135 AliRICHHelix helix(x0,p0,TMath::Sign(1,(Int_t)pParticle->GetPDG()->Charge()),b);
136 Int_t iChamber=helix.RichIntersect(pRich->P());
137 AliDebug(1,Form("intersection with %i chamber found",iChamber));
138 if(!iChamber) continue;// no intersection with RICH found
139 hnvec[4]=helix.PosPc().X();
140 hnvec[5]=helix.PosPc().Y();
141 Double_t distMip=9999; //min distance between clusters and track position on PC
142 Double_t mipX=kBad; //min distance between clusters and track position on PC
143 Double_t mipY=kBad; //min distance between clusters and track position on PC
144 Double_t chargeMip=kBad; // charge MIP to find
145 Int_t iMipId=kBad; //index of that min distance cluster
146 for(Int_t iClusN=0;iClusN<pRich->Clusters(iChamber)->GetEntries();iClusN++){//clusters loop for intersected chamber
147 AliRICHcluster *pClus=(AliRICHcluster*)pRich->Clusters(iChamber)->UncheckedAt(iClusN);//get pointer to current cluster
148 Double_t distCurrent=pClus->DistTo(helix.PosPc());//ditance between current cluster and helix intersection with PC
149 if(distCurrent<distMip){distMip=distCurrent;mipX=pClus->X();
151 chargeMip=pClus->Q();iMipId=1000000*iChamber+iClusN;}//find cluster nearest to the track
153 AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(),
154 helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc())));
155 }//clusters loop for intersected chamber
157 AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip));
158 hnvec[6]=mipX;hnvec[7]=mipY;
160 AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId);
161 Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track
162 hnvec[9]=thetaCerenkov;
163 hnvec[10]=recon.GetHoughPhotons();
164 hnvec[11]=(Double_t)iMipId;
165 hnvec[12]=(Double_t)iChamber;
166 hnvec[13]=(Double_t)pParticle->GetPdgCode();
167 if(hn) hn->Fill(hnvec);
168 AliDebug(1,Form("FINAL Theta Cerenkov=%f",thetaCerenkov));
169 }//stack particles loop
171 pRich->GetLoader()->UnloadRecPoints();
174 //__________________________________________________________________________________________________
175 Int_t AliRICHTracker::LoadClusters(TTree *pTree)
177 // Load clusters for RICH
178 AliDebug(1,"Start."); pTree->GetEntry(0); AliDebug(1,"Stop."); return 0;
180 //__________________________________________________________________________________________________
181 void AliRICHTracker::CalcProb(Double_t thetaCer,Double_t pmod, Double_t *richPID)
183 // Calculates probability to be a electron-muon-pion-kaon-proton
184 // from the given Cerenkov angle and momentum assuming no initial particle composition
185 // (i.e. apriory probability to be the particle of the given sort is the same for all sorts)
186 Double_t height[AliPID::kSPECIES];Double_t totalHeight=0;
187 for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++){
188 Double_t mass = AliPID::ParticleMass(iPart);
189 Double_t refIndex=AliRICHParam::RefIdxC6F14(6.755);
190 Double_t cosThetaTh = TMath::Sqrt(mass*mass+pmod*pmod)/(refIndex*pmod);
191 if(cosThetaTh>=1) {break;}
192 Double_t thetaTh = TMath::ACos(cosThetaTh);
193 Double_t sinThetaThNorm = TMath::Sin(thetaTh)/TMath::Sqrt(1-1/(refIndex*refIndex));
194 Double_t sigmaThetaTh = (0.014*(1/sinThetaThNorm-1) + 0.0043)*1.25;
195 height[iPart] = TMath::Gaus(thetaCer,thetaTh,sigmaThetaTh);
196 totalHeight +=height[iPart];
198 for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++) richPID[iPart] = height[iPart]/totalHeight;
200 //__________________________________________________________________________________________________