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998b831f | 1 | #include "AliRICHTracker.h" |
2 | #include <AliESD.h> | |
3 | #include <TVector3.h> | |
4 | #include <TTree.h> | |
5 | #include "AliRICH.h" | |
6 | #include "AliRICHHelix.h" | |
7 | #include <AliMagF.h> | |
8 | #include "AliRICHRecon.h" | |
9 | #include <AliStack.h> | |
10 | #include <TParticle.h> | |
30c60010 | 11 | #include <TMath.h> |
998b831f | 12 | ClassImp(AliRICHTracker) |
30c60010 | 13 | //__________________________________________________________________________________________________ |
998b831f | 14 | Int_t AliRICHTracker::PropagateBack(AliESD *pESD) |
15 | { | |
a25b3368 | 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 | |
30c60010 | 20 | AliDebug(1,"Start pattern recognition"); |
a25b3368 | 21 | if(pESD->GetNumberOfTracks()) |
22 | RecWithESD(pESD); | |
30c60010 | 23 | else |
a25b3368 | 24 | RecWithStack(0); |
30c60010 | 25 | AliDebug(1,"Stop pattern recognition"); |
26 | ||
27 | return 0; // error code: 0=no error; | |
a25b3368 | 28 | }//PropagateBack() |
30c60010 | 29 | //__________________________________________________________________________________________________ |
30 | void AliRICHTracker::RecWithESD(AliESD *pESD) | |
31 | { | |
32 | //recontruction from ESD | |
33 | // | |
998b831f | 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 | |
39 | ||
40 | AliRICH *pRich=((AliRICH*)gAlice->GetDetector("RICH")); | |
41 | ||
998b831f | 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 | |
45 | pTrack->GetXYZ(xb); | |
1cb5a97c | 46 | pTrack->GetPxPyPz(pb); |
47 | Int_t status=pTrack->GetStatus()&AliESDtrack::kTOFout;//get running track parameters | |
7df3c0b6 | 48 | Int_t charge = (Int_t)(-TMath::Sign(1.,pTrack->GetSign()*b)); |
39853df5 | 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); | |
998b831f | 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 | |
55 | ||
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 | |
a25b3368 | 61 | if(distCurrent<distMip){ |
62 | distMip=distCurrent; | |
63 | iMipId=iClusN; | |
64 | }//find cluster nearest to the track | |
998b831f | 65 | AliDebug(1,Form("Ploc (%f,%f,%f) dist= %f",helix.Ploc().Mag(),helix.Ploc().Theta()*TMath::RadToDeg(), |
a25b3368 | 66 | helix.Ploc().Phi()*TMath::RadToDeg(),pClus->DistTo(helix.PosPc()))); |
67 | }//clusters loop for intersected chamber | |
998b831f | 68 | |
69 | AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip)); | |
70 | ||
a25b3368 | 71 | AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId); //create reconstruction object for helix, list of clusters |
998b831f | 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); | |
75 | ||
1cb5a97c | 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); | |
998b831f | 79 | |
80 | }//ESD tracks loop | |
81 | AliDebug(1,"Stop."); | |
30c60010 | 82 | } //RecWithESD |
83 | //__________________________________________________________________________________________________ | |
1cb5a97c | 84 | void AliRICHTracker::RecWithStack(TNtupleD *hn) |
30c60010 | 85 | { |
a25b3368 | 86 | // Reconstruction for particles from STACK |
30c60010 | 87 | AliRICH *pRich=((AliRICH*)gAlice->GetDetector("RICH")); |
88 | ||
1cb5a97c | 89 | // pRich->GetLoader()->GetRunLoader()->LoadHeader(); |
90 | pRich->GetLoader()->GetRunLoader()->LoadKinematics(); | |
30c60010 | 91 | AliStack *pStack = pRich->GetLoader()->GetRunLoader()->Stack(); |
39853df5 | 92 | if(!pStack) {AliDebug(1,Form("No STACK found in AliRoot"));return;} |
30c60010 | 93 | Int_t iNtracks=pStack->GetNtrack(); |
1cb5a97c | 94 | AliDebug(1,Form(" Start reconstruction with %i track(s) from Stack",iNtracks)); |
95 | ||
ab92fbe6 | 96 | Double_t hnvec[20]; |
1cb5a97c | 97 | |
30c60010 | 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 | |
101 | ||
102 | ||
1cb5a97c | 103 | if(pRich->GetLoader()->LoadRecPoints()) {AliDebug(1,Form("No clusters found in RICH"));return;} |
104 | pRich->GetLoader()->TreeR()->GetEntry(0); | |
105 | ||
a25b3368 | 106 | for(Int_t iTrackN=0;iTrackN<iNtracks;iTrackN++){//stack particles loop |
30c60010 | 107 | TParticle *pParticle = pStack->Particle(iTrackN); |
39853df5 | 108 | if(!pParticle) {AliDebug(1,Form("Not a valid TParticle pointer. Track skipped"));continue;} |
109 | AliDebug(1,Form(" PDG code : %i",pParticle->GetPdgCode())); | |
ab92fbe6 | 110 | // |
111 | // problem of PDG code of some extra particles to be solved!!!!!!!!! | |
112 | // | |
113 | // found problem! Look in TRD directory : codes from Fluka are : | |
114 | // | |
115 | // if ((pdg_code == 10010020) || | |
116 | // (pdg_code == 10010030) || | |
117 | // (pdg_code == 50000050) || | |
118 | // (pdg_code == 50000051) || | |
119 | // (pdg_code == 10020040)) { | |
120 | // | |
121 | if(pParticle->GetPdgCode()>=50000050||pParticle->GetPdgCode()==0||pParticle->GetPdgCode()>10000) {AliDebug(1,Form("A photon as track... Track skipped"));continue;} | |
122 | // | |
123 | // to be updated for us!! | |
124 | // | |
9f873529 | 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... | |
1cb5a97c | 129 | hnvec[0]=pParticle->P(); |
130 | hnvec[1]=pParticle->GetPDG()->Charge(); | |
131 | hnvec[2]=pParticle->Theta(); | |
132 | hnvec[3]=pParticle->Phi(); | |
30c60010 | 133 | p0.SetMagThetaPhi(pParticle->P(),pParticle->Theta(),pParticle->Phi()); |
134 | x0.SetXYZ(pParticle->Vx(),pParticle->Vy(),pParticle->Vz()); | |
9f873529 | 135 | AliRICHHelix helix(x0,p0,TMath::Sign(1,(Int_t)pParticle->GetPDG()->Charge()),b); |
30c60010 | 136 | Int_t iChamber=helix.RichIntersect(pRich->P()); |
137 | AliDebug(1,Form("intersection with %i chamber found",iChamber)); | |
1cb5a97c | 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 | |
30c60010 | 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 | |
1cb5a97c | 149 | if(distCurrent<distMip){distMip=distCurrent;mipX=pClus->X(); |
150 | mipY=pClus->Y(); | |
151 | chargeMip=pClus->Q();iMipId=1000000*iChamber+iClusN;}//find cluster nearest to the track | |
30c60010 | 152 | |
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()))); | |
a25b3368 | 155 | }//clusters loop for intersected chamber |
30c60010 | 156 | |
157 | AliDebug(1,Form("Min distance cluster: %i dist is %f",iMipId,distMip)); | |
1cb5a97c | 158 | hnvec[6]=mipX;hnvec[7]=mipY; |
159 | hnvec[8]=chargeMip; | |
30c60010 | 160 | AliRICHRecon recon(&helix,pRich->Clusters(iChamber),iMipId); |
161 | Double_t thetaCerenkov=recon.ThetaCerenkov(); //search for mean Cerenkov angle for this track | |
1cb5a97c | 162 | hnvec[9]=thetaCerenkov; |
163 | hnvec[10]=recon.GetHoughPhotons(); | |
164 | hnvec[11]=(Double_t)iMipId; | |
ab92fbe6 | 165 | hnvec[12]=(Double_t)iChamber; |
166 | hnvec[13]=(Double_t)pParticle->GetPdgCode(); | |
1cb5a97c | 167 | if(hn) hn->Fill(hnvec); |
30c60010 | 168 | AliDebug(1,Form("FINAL Theta Cerenkov=%f",thetaCerenkov)); |
a25b3368 | 169 | }//stack particles loop |
1cb5a97c | 170 | |
39853df5 | 171 | pRich->GetLoader()->UnloadRecPoints(); |
30c60010 | 172 | AliDebug(1,"Stop."); |
a25b3368 | 173 | }//RecWithStack |
174 | //__________________________________________________________________________________________________ | |
998b831f | 175 | Int_t AliRICHTracker::LoadClusters(TTree *pTree) |
176 | { | |
177 | // Load clusters for RICH | |
178 | AliDebug(1,"Start."); pTree->GetEntry(0); AliDebug(1,"Stop."); return 0; | |
179 | } | |
30c60010 | 180 | //__________________________________________________________________________________________________ |
181 | void AliRICHTracker::CalcProb(Double_t thetaCer,Double_t pmod, Double_t *richPID) | |
182 | { | |
a25b3368 | 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) | |
304864ab | 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); | |
a25b3368 | 189 | Double_t refIndex=AliRICHParam::RefIdxC6F14(6.755); |
30c60010 | 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]; | |
197 | } | |
304864ab | 198 | for(Int_t iPart=0;iPart<AliPID::kSPECIES;iPart++) richPID[iPart] = height[iPart]/totalHeight; |
30c60010 | 199 | }//CalcProb |
a25b3368 | 200 | //__________________________________________________________________________________________________ |