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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. *
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14 **************************************************************************/
16 //_________________________________________________________________________
17 // A Reconstructed Particle in PHOS
18 // To become a general class of AliRoot ?
19 // Why should I put meaningless comments
23 //*-- Author: Yves Schutz (SUBATECH)
26 // --- ROOT system ---
28 // --- Standard library ---
31 // --- AliRoot header files ---
33 #include "AliPHOSHit.h"
34 #include "AliPHOSDigit.h"
35 #include "AliPHOSTrackSegment.h"
36 #include "AliPHOSEmcRecPoint.h"
37 #include "AliPHOSRecParticle.h"
38 #include "AliPHOSLoader.h"
39 #include "AliPHOSGeometry.h"
42 //____________________________________________________________________________
43 AliPHOSRecParticle::AliPHOSRecParticle():
49 const Int_t nSPECIES = AliPID::kSPECIESN;
50 for(Int_t i = 0; i<nSPECIES ; i++)
55 //____________________________________________________________________________
56 AliPHOSRecParticle::AliPHOSRecParticle(const AliPHOSRecParticle & rp):
57 AliPHOSFastRecParticle(rp),
58 fPHOSTrackSegment(rp.fPHOSTrackSegment),
64 fIndexInList = rp.fIndexInList ;
66 fPdgCode = rp.fPdgCode;
67 fStatusCode = rp.fStatusCode;
68 fMother[0] = rp.fMother[0];
69 fMother[1] = rp.fMother[1];
70 fDaughter[0] = rp.fDaughter[0];
71 fDaughter[1] = rp.fDaughter[1];
73 fCalcMass = rp.fCalcMass;
82 fPolarTheta = rp.fPolarTheta;
83 fPolarPhi = rp.fPolarPhi;
84 fParticlePDG = rp.fParticlePDG;
85 const Int_t nSPECIES = AliPID::kSPECIESN;
86 for(Int_t i = 0; i<nSPECIES ; i++)
90 //____________________________________________________________________________
91 Int_t AliPHOSRecParticle::GetNPrimaries() const
96 //____________________________________________________________________________
97 Int_t AliPHOSRecParticle::GetNPrimariesToRecParticles() const
99 // Get the number of primaries at the origine of the RecParticle
101 AliRunLoader* rl = AliRunLoader::Instance() ;
102 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
103 Int_t emcRPindex = static_cast<AliPHOSTrackSegment*>(phosLoader->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
104 static_cast<AliPHOSEmcRecPoint*>(phosLoader->EmcRecPoints()->At(emcRPindex))->GetPrimaries(rv) ;
108 //____________________________________________________________________________
109 const TParticle * AliPHOSRecParticle::GetPrimary() const
111 // Get the primary particle at the origine of the RecParticle and
112 // which has deposited the largest energy in SDigits
113 AliRunLoader* rl = AliRunLoader::Instance() ;
114 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
115 rl->GetEvent(rl->GetEventNumber()) ;
116 rl->LoadKinematics("READ");
117 rl->LoadSDigits("READ");
119 if(GetNPrimaries() == 0)
121 if(GetNPrimaries() == 1)
122 return GetPrimary(0) ;
126 // Get PHOS Geometry object
127 AliPHOSGeometry *geom;
128 if (!(geom = AliPHOSGeometry::GetInstance()))
129 geom = AliPHOSGeometry::GetInstance("IHEP","");
131 //DP to be fixed: Why do we use this method here??? M.B. use RecPoint???
132 Double_t vtx[3]={0.,0.,0.} ;
133 geom->ImpactOnEmc(vtx,static_cast<double>(Theta()),static_cast<double>(Phi()), module,z,x);
137 geom->RelPosToAbsId(module,x,z,AbsId) ;
138 TClonesArray * sdigits = phosLoader->SDigits() ;
139 AliPHOSDigit * sdig ;
141 for(Int_t i = 0 ; i < sdigits->GetEntriesFast() ; i++){
142 sdig = static_cast<AliPHOSDigit *>(sdigits->At(i)) ;
143 if((sdig->GetId() == AbsId)){
144 if((sdig->GetAmp() > amp) && (sdig->GetNprimary())){
145 amp = sdig->GetAmp() ;
146 iPrim = sdig->GetPrimary(1) ;
148 // do not scan rest of list
149 if(sdig->GetId() > AbsId)
155 return rl->Stack()->Particle(iPrim) ;
160 //____________________________________________________________________________
161 Int_t AliPHOSRecParticle::GetPrimaryIndex() const
163 // Get the primary track index in TreeK which deposits the most energy
164 // in Digits which forms EmcRecPoint, which produces TrackSegment,
165 // which the RecParticle is created from
168 AliRunLoader* rl = AliRunLoader::Instance() ;
169 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
170 rl->GetEvent(rl->GetEventNumber()) ;
171 rl->LoadHits("READ");
172 rl->LoadDigits("READ");
173 rl->LoadRecPoints("READ");
174 rl->LoadTracks("READ");
176 // Get TrackSegment corresponding to this RecParticle
177 const AliPHOSTrackSegment *ts = phosLoader->TrackSegment(fPHOSTrackSegment);
179 // Get EmcRecPoint corresponding to this TrackSegment
180 Int_t emcRecPointIndex = ts->GetEmcIndex();
182 const AliPHOSEmcRecPoint *emcRecPoint = phosLoader->EmcRecPoint(emcRecPointIndex);
184 // Get the list of digits forming this EmcRecParticle
185 Int_t nDigits = emcRecPoint->GetDigitsMultiplicity();
186 Int_t *digitList = emcRecPoint->GetDigitsList();
188 // Find the digit with maximum amplitude
190 Int_t bestDigitIndex = -1;
191 for (Int_t iDigit=0; iDigit<nDigits; iDigit++) {
192 const AliPHOSDigit * digit = phosLoader->Digit(digitList[iDigit]);
193 if (digit->GetAmp() > maxAmp) {
194 maxAmp = digit->GetAmp();
195 bestDigitIndex = iDigit;
198 if (bestDigitIndex>-1) {
199 const AliPHOSDigit * digit = phosLoader->Digit(digitList[bestDigitIndex]);
200 if (digit==0) return -12345;
203 // Get the list of primary tracks producing this digit
204 // and find which track has more track energy.
205 //Int_t nPrimary = digit->GetNprimary();
206 //TParticle *track = 0;
207 //Double_t energyEM = 0;
208 //Double_t energyHadron = 0;
209 //Int_t trackEM = -1;
210 //Int_t trackHadron = -1;
211 //for (Int_t iPrim=0; iPrim<nPrimary; iPrim++) {
212 // Int_t iPrimary = digit->GetPrimary(iPrim+1);
213 // if (iPrimary == -1 || TMath::Abs(iPrimary)>10000000)
214 // continue ; //PH 10000000 is the shift of the track
215 // //PH indexes in the underlying event
216 // track = gime->Primary(iPrimary);
217 // Int_t pdgCode = track->GetPdgCode();
218 // Double_t energy = track->Energy();
219 // if (pdgCode==22 || TMath::Abs(pdgCode)==11) {
220 // if (energy > energyEM) {
221 // energyEM = energy;
222 // trackEM = iPrimary;
226 // if (energy > energyHadron) {
227 // energyHadron = energy;
228 // trackHadron = iPrimary;
232 // Preferences are given to electromagnetic tracks
233 //if (trackEM != -1) return trackEM; // track is gamma or e+-
234 //if (trackHadron != -1) return trackHadron; // track is hadron
235 //return -12345; // no track found :(
238 // Get the list of hits producing this digit,
239 // find which hit has deposited more energy
240 // and find the primary track.
242 TClonesArray *hits = phosLoader->Hits();
243 if (hits==0) return -12345;
245 Double_t maxedep = 0;
247 Int_t nHits = hits ->GetEntries();
248 Int_t id = (phosLoader->Digit(digitList[bestDigitIndex]))->GetId();
250 for (Int_t iHit=0; iHit<nHits; iHit++) {
251 const AliPHOSHit * hit = phosLoader->Hit(iHit);
252 if(hit->GetId() == id){
253 Double_t edep = hit->GetEnergy();
254 Int_t track = hit->GetPrimary();
262 if (maxtrack != -1) return maxtrack; // track is hadron
263 return -12345; // no track found :(
266 //____________________________________________________________________________
267 const TParticle * AliPHOSRecParticle::GetPrimary(Int_t index) const
269 // Get one of the primary particles at the origine of the RecParticle
270 if ( index > GetNPrimariesToRecParticles() ) {
272 Warning("GetPrimary", "AliPHOSRecParticle::GetPrimary -> %d is larger that the number of primaries %d",
273 index, GetNPrimaries()) ;
278 AliRunLoader* rl = AliRunLoader::Instance() ;
279 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
281 Int_t emcRPindex = static_cast<AliPHOSTrackSegment*>(phosLoader->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
282 Int_t primaryindex = static_cast<AliPHOSEmcRecPoint*>(phosLoader->EmcRecPoints()->At(emcRPindex))->GetPrimaries(dummy)[index] ;
283 return rl->Stack()->Particle(primaryindex) ;
288 //____________________________________________________________________________
289 void AliPHOSRecParticle::SetPID(Int_t type, Float_t weight)
291 // Set the probability densities that this reconstructed particle
294 // ----------------------
304 // 9 Conversion electron
306 fPID[type] = weight ;