Merge branch 'master_patch'
[u/mrichter/AliRoot.git] / PHOS / AliPHOSRecParticle.cxx
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1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15/* $Id$ */
16//_________________________________________________________________________
17// A Reconstructed Particle in PHOS
18// To become a general class of AliRoot ?
19// Why should I put meaningless comments
20// just to satisfy
21// the code checker
22//
23//*-- Author: Yves Schutz (SUBATECH)
24
25
26// --- ROOT system ---
27
28// --- Standard library ---
29
30
31// --- AliRoot header files ---
32#include "AliStack.h"
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"
40#include "AliLog.h"
41
42//____________________________________________________________________________
43AliPHOSRecParticle::AliPHOSRecParticle():
44 fPHOSTrackSegment(0),
45 fDebug(kFALSE),
46 fPos()
47{
48 // ctor
49 const Int_t nSPECIES = AliPID::kSPECIESCN;
50 for(Int_t i = 0; i<nSPECIES ; i++)
51 fPID[i]=0.;
52}
53
54
55//____________________________________________________________________________
56AliPHOSRecParticle::AliPHOSRecParticle(const AliPHOSRecParticle & rp):
57 AliPHOSFastRecParticle(rp),
58 fPHOSTrackSegment(rp.fPHOSTrackSegment),
59 fDebug(kFALSE),
60 fPos()
61{
62 // copy ctor
63 fType = rp.fType ;
64 fIndexInList = rp.fIndexInList ;
65
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];
72 fWeight = rp.fWeight;
73 fCalcMass = rp.fCalcMass;
74 fPx = rp.fPx;
75 fPy = rp.fPy;
76 fPz = rp.fPz;
77 fE = rp.fE;
78 fVx = rp.fVx;
79 fVy = rp.fVy;
80 fVz = rp.fVz;
81 fVt = rp.fVt;
82 fPolarTheta = rp.fPolarTheta;
83 fPolarPhi = rp.fPolarPhi;
84 fParticlePDG = rp.fParticlePDG;
85 const Int_t nSPECIES = AliPID::kSPECIESCN;
86 for(Int_t i = 0; i<nSPECIES ; i++)
87 fPID[i]=rp.fPID[i];
88}
89
90//____________________________________________________________________________
91AliPHOSRecParticle & AliPHOSRecParticle::operator = (const AliPHOSRecParticle &)
92{
93 Fatal("operator =", "not implemented");
94 return *this;
95}
96
97//____________________________________________________________________________
98Int_t AliPHOSRecParticle::GetNPrimaries() const
99{
100 return -1;
101}
102
103//____________________________________________________________________________
104Int_t AliPHOSRecParticle::GetNPrimariesToRecParticles() const
105{
106 // Get the number of primaries at the origine of the RecParticle
107 Int_t rv = 0 ;
108 AliRunLoader* rl = AliRunLoader::Instance() ;
109 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
110 Int_t emcRPindex = static_cast<AliPHOSTrackSegment*>(phosLoader->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
111 static_cast<AliPHOSEmcRecPoint*>(phosLoader->EmcRecPoints()->At(emcRPindex))->GetPrimaries(rv) ;
112 return rv ;
113}
114
115//____________________________________________________________________________
116const TParticle * AliPHOSRecParticle::GetPrimary() const
117{
118 // Get the primary particle at the origine of the RecParticle and
119 // which has deposited the largest energy in SDigits
120 AliRunLoader* rl = AliRunLoader::Instance() ;
121 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
122 rl->GetEvent(rl->GetEventNumber()) ;
123 rl->LoadKinematics("READ");
124 rl->LoadSDigits("READ");
125
126 if(GetNPrimaries() == 0)
127 return 0 ;
128 if(GetNPrimaries() == 1)
129 return GetPrimary(0) ;
130 Int_t AbsId = 0;
131 Int_t module ;
132
133 // Get PHOS Geometry object
134 AliPHOSGeometry *geom;
135 if (!(geom = AliPHOSGeometry::GetInstance()))
136 geom = AliPHOSGeometry::GetInstance("IHEP","");
137 Double_t x,z ;
138//DP to be fixed: Why do we use this method here??? M.B. use RecPoint???
139 Double_t vtx[3]={0.,0.,0.} ;
140 geom->ImpactOnEmc(vtx,static_cast<double>(Theta()),static_cast<double>(Phi()), module,z,x);
141 Int_t amp = 0 ;
142 Int_t iPrim=-1 ;
143 if(module != 0){
144 geom->RelPosToAbsId(module,x,z,AbsId) ;
145 TClonesArray * sdigits = phosLoader->SDigits() ;
146 AliPHOSDigit * sdig ;
147
148 for(Int_t i = 0 ; i < sdigits->GetEntriesFast() ; i++){
149 sdig = static_cast<AliPHOSDigit *>(sdigits->At(i)) ;
150 if((sdig->GetId() == AbsId)){
151 if((sdig->GetAmp() > amp) && (sdig->GetNprimary())){
152 amp = sdig->GetAmp() ;
153 iPrim = sdig->GetPrimary(1) ;
154 }
155 // do not scan rest of list
156 if(sdig->GetId() > AbsId)
157 continue ;
158 }
159 }
160 }
161 if(iPrim >= 0)
162 return rl->Stack()->Particle(iPrim) ;
163 else
164 return 0 ;
165}
166
167//____________________________________________________________________________
168Int_t AliPHOSRecParticle::GetPrimaryIndex() const
169{
170 // Get the primary track index in TreeK which deposits the most energy
171 // in Digits which forms EmcRecPoint, which produces TrackSegment,
172 // which the RecParticle is created from
173
174
175 AliRunLoader* rl = AliRunLoader::Instance() ;
176 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
177 rl->GetEvent(rl->GetEventNumber()) ;
178 rl->LoadHits("READ");
179 rl->LoadDigits("READ");
180 rl->LoadRecPoints("READ");
181 rl->LoadTracks("READ");
182
183 // Get TrackSegment corresponding to this RecParticle
184 const AliPHOSTrackSegment *ts = phosLoader->TrackSegment(fPHOSTrackSegment);
185
186 // Get EmcRecPoint corresponding to this TrackSegment
187 Int_t emcRecPointIndex = ts->GetEmcIndex();
188
189 const AliPHOSEmcRecPoint *emcRecPoint = phosLoader->EmcRecPoint(emcRecPointIndex);
190
191 // Get the list of digits forming this EmcRecParticle
192 Int_t nDigits = emcRecPoint->GetDigitsMultiplicity();
193 Int_t *digitList = emcRecPoint->GetDigitsList();
194
195 // Find the digit with maximum amplitude
196 Int_t maxAmp = 0;
197 Int_t bestDigitIndex = -1;
198 for (Int_t iDigit=0; iDigit<nDigits; iDigit++) {
199 const AliPHOSDigit * digit = phosLoader->Digit(digitList[iDigit]);
200 if (digit->GetAmp() > maxAmp) {
201 maxAmp = digit->GetAmp();
202 bestDigitIndex = iDigit;
203 }
204 }
205 if (bestDigitIndex>-1) {
206 const AliPHOSDigit * digit = phosLoader->Digit(digitList[bestDigitIndex]);
207 if (digit==0) return -12345;
208 }
209
210 // Get the list of primary tracks producing this digit
211 // and find which track has more track energy.
212 //Int_t nPrimary = digit->GetNprimary();
213 //TParticle *track = 0;
214 //Double_t energyEM = 0;
215 //Double_t energyHadron = 0;
216 //Int_t trackEM = -1;
217 //Int_t trackHadron = -1;
218 //for (Int_t iPrim=0; iPrim<nPrimary; iPrim++) {
219 // Int_t iPrimary = digit->GetPrimary(iPrim+1);
220 // if (iPrimary == -1 || TMath::Abs(iPrimary)>10000000)
221 // continue ; //PH 10000000 is the shift of the track
222 // //PH indexes in the underlying event
223 // track = gime->Primary(iPrimary);
224 // Int_t pdgCode = track->GetPdgCode();
225 // Double_t energy = track->Energy();
226 // if (pdgCode==22 || TMath::Abs(pdgCode)==11) {
227 // if (energy > energyEM) {
228 // energyEM = energy;
229 // trackEM = iPrimary;
230 // }
231 // }
232 // else {
233 // if (energy > energyHadron) {
234 // energyHadron = energy;
235 // trackHadron = iPrimary;
236 // }
237 // }
238 //}
239 // Preferences are given to electromagnetic tracks
240 //if (trackEM != -1) return trackEM; // track is gamma or e+-
241 //if (trackHadron != -1) return trackHadron; // track is hadron
242 //return -12345; // no track found :(
243
244
245 // Get the list of hits producing this digit,
246 // find which hit has deposited more energy
247 // and find the primary track.
248
249 TClonesArray *hits = phosLoader->Hits();
250 if (hits==0) return -12345;
251
252 Double_t maxedep = 0;
253 Int_t maxtrack = -1;
254 Int_t nHits = hits ->GetEntries();
255 Int_t id = (phosLoader->Digit(digitList[bestDigitIndex]))->GetId();
256
257 for (Int_t iHit=0; iHit<nHits; iHit++) {
258 const AliPHOSHit * hit = phosLoader->Hit(iHit);
259 if(hit->GetId() == id){
260 Double_t edep = hit->GetEnergy();
261 Int_t track = hit->GetPrimary();
262 if(edep > maxedep){
263 maxedep = edep;
264 maxtrack = track;
265 }
266 }
267 }
268
269 if (maxtrack != -1) return maxtrack; // track is hadron
270 return -12345; // no track found :(
271}
272
273//____________________________________________________________________________
274const TParticle * AliPHOSRecParticle::GetPrimary(Int_t index) const
275{
276 // Get one of the primary particles at the origine of the RecParticle
277 if ( index > GetNPrimariesToRecParticles() ) {
278 if (fDebug)
279 Warning("GetPrimary", "AliPHOSRecParticle::GetPrimary -> %d is larger that the number of primaries %d",
280 index, GetNPrimaries()) ;
281 return 0 ;
282 }
283 else {
284 Int_t dummy ;
285 AliRunLoader* rl = AliRunLoader::Instance() ;
286 AliPHOSLoader * phosLoader = static_cast<AliPHOSLoader*>(rl->GetLoader("PHOSLoader"));
287
288 Int_t emcRPindex = static_cast<AliPHOSTrackSegment*>(phosLoader->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
289 Int_t primaryindex = static_cast<AliPHOSEmcRecPoint*>(phosLoader->EmcRecPoints()->At(emcRPindex))->GetPrimaries(dummy)[index] ;
290 return rl->Stack()->Particle(primaryindex) ;
291 }
292 // return 0 ;
293}
294
295//____________________________________________________________________________
296void AliPHOSRecParticle::SetPID(Int_t type, Float_t weight)
297{
298 // Set the probability densities that this reconstructed particle
299 // has a type of i:
300 // i particle types
301 // ----------------------
302 // 0 electron
303 // 1 muon
304 // 2 pi+-
305 // 3 K+-
306 // 4 p/pbar
307 // 5 photon
308 // 6 pi0 at high pt
309 // 7 neutron
310 // 8 K0L
311 // 9 Conversion electron
312
313 fPID[type] = weight ;
314}