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[u/mrichter/AliRoot.git] / PHOS / AliPHOSRecParticle.cxx
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6ad0bfa0 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 **************************************************************************/
b2a60966 15/* $Id$ */
6ad0bfa0 16//_________________________________________________________________________
b2a60966 17// A Reconstructed Particle in PHOS
2f04ed65 18// To become a general class of AliRoot ?
19// Why should I put meaningless comments
20// just to satisfy
21// the code checker
b2a60966 22//
23//*-- Author: Yves Schutz (SUBATECH)
24
6ad0bfa0 25
26// --- ROOT system ---
27
28// --- Standard library ---
29
ed4205d8 30
6ad0bfa0 31// --- AliRoot header files ---
6ad0bfa0 32#include "AliPHOSRecParticle.h"
8f3968d8 33#include "AliPHOSGetter.h"
c81ced2d 34#include "AliPHOSGeometry.h"
1212b8da 35#include "AliLog.h"
6ad0bfa0 36
0272607d 37//____________________________________________________________________________
43fbaae1 38AliPHOSRecParticle::AliPHOSRecParticle():
39 fPHOSTrackSegment(0),
40 fDebug(kFALSE),
41 fPos()
0272607d 42{
43 // ctor
304864ab 44 const Int_t nSPECIES = AliPID::kSPECIESN;
88340ded 45 for(Int_t i = 0; i<nSPECIES ; i++)
0272607d 46 fPID[i]=0.;
47}
6ad0bfa0 48
49
50//____________________________________________________________________________
43fbaae1 51AliPHOSRecParticle::AliPHOSRecParticle(const AliPHOSRecParticle & rp):
52 AliPHOSFastRecParticle(rp),
53 fPHOSTrackSegment(rp.fPHOSTrackSegment),
54 fDebug(kFALSE),
55 fPos()
a73f33f0 56{
b2a60966 57 // copy ctor
a73f33f0 58 fType = rp.fType ;
83974468 59 fIndexInList = rp.fIndexInList ;
b2a60966 60
cafda784 61 fPdgCode = rp.fPdgCode;
62 fStatusCode = rp.fStatusCode;
63 fMother[0] = rp.fMother[0];
64 fMother[1] = rp.fMother[1];
65 fDaughter[0] = rp.fDaughter[0];
66 fDaughter[1] = rp.fDaughter[1];
67 fWeight = rp.fWeight;
68 fCalcMass = rp.fCalcMass;
69 fPx = rp.fPx;
70 fPy = rp.fPy;
71 fPz = rp.fPz;
72 fE = rp.fE;
73 fVx = rp.fVx;
74 fVy = rp.fVy;
75 fVz = rp.fVz;
76 fVt = rp.fVt;
77 fPolarTheta = rp.fPolarTheta;
78 fPolarPhi = rp.fPolarPhi;
79 fParticlePDG = rp.fParticlePDG;
304864ab 80 const Int_t nSPECIES = AliPID::kSPECIESN;
88340ded 81 for(Int_t i = 0; i<nSPECIES ; i++)
0272607d 82 fPID[i]=rp.fPID[i];
b2a60966 83}
83974468 84
8f3968d8 85//____________________________________________________________________________
17323043 86Int_t AliPHOSRecParticle::GetNPrimaries() const
88cb7938 87{
88 return -1;
a278df55 89}
90
91//____________________________________________________________________________
17323043 92Int_t AliPHOSRecParticle::GetNPrimariesToRecParticles() const
8f3968d8 93{
e957fea8 94 // Get the number of primaries at the origine of the RecParticle
8f3968d8 95 Int_t rv = 0 ;
88cb7938 96 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
97 Int_t emcRPindex = dynamic_cast<AliPHOSTrackSegment*>(gime->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
98 dynamic_cast<AliPHOSEmcRecPoint*>(gime->EmcRecPoints()->At(emcRPindex))->GetPrimaries(rv) ;
8f3968d8 99 return rv ;
100}
83974468 101
8f3968d8 102//____________________________________________________________________________
c81ced2d 103const TParticle * AliPHOSRecParticle::GetPrimary() const
104{
105 // Get the primary particle at the origine of the RecParticle and
106 // which has deposited the largest energy in SDigits
107 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
108 if (!gime)
109 Error("GetPrimary", "Getter not yet instantiated") ;
110 gime->Event(gime->EventNumber(), "SRTPX") ;
111 if(GetNPrimaries() == 0)
112 return 0 ;
113 if(GetNPrimaries() == 1)
114 return GetPrimary(0) ;
115 Int_t AbsId = 0;
116 Int_t module ;
117 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
118 Double_t x,z ;
5a9ecaeb 119//DP to be fixed: Why do we use this method here??? M.B. use RecPoint???
120 Double_t vtx[3]={0.,0.,0.} ;
121 geom->ImpactOnEmc(vtx,static_cast<double>(Theta()),static_cast<double>(Phi()), module,z,x);
c81ced2d 122 Int_t amp = 0 ;
123 Int_t iPrim=-1 ;
124 if(module != 0){
125 geom->RelPosToAbsId(module,x,z,AbsId) ;
126 TClonesArray * sdigits = gime->SDigits() ;
127 AliPHOSDigit * sdig ;
128
129 for(Int_t i = 0 ; i < sdigits->GetEntriesFast() ; i++){
130 sdig = static_cast<AliPHOSDigit *>(sdigits->At(i)) ;
131 if((sdig->GetId() == AbsId)){
132 if((sdig->GetAmp() > amp) && (sdig->GetNprimary())){
133 amp = sdig->GetAmp() ;
134 iPrim = sdig->GetPrimary(1) ;
135 }
136 // do not scan rest of list
137 if(sdig->GetId() > AbsId)
138 continue ;
139 }
140 }
141 }
142 if(iPrim >= 0)
143 return gime->Primary(iPrim) ;
144 else
145 return 0 ;
146}
147
148//____________________________________________________________________________
eb0b1051 149Int_t AliPHOSRecParticle::GetPrimaryIndex() const
09286392 150{
151 // Get the primary track index in TreeK which deposits the most energy
152 // in Digits which forms EmcRecPoint, which produces TrackSegment,
153 // which the RecParticle is created from
154
1212b8da 155
09286392 156 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
157 if (!gime)
1212b8da 158 AliError(Form("Getter not yet instantiated")) ;
eb0b1051 159 //PH gime->Event(gime->EventNumber(), "DRTX") ;
84294dcd 160 gime->Event(gime->EventNumber(), "DRT") ;
1212b8da 161
09286392 162 // Get TrackSegment corresponding to this RecParticle
163 AliPHOSTrackSegment *ts = gime->TrackSegment(fPHOSTrackSegment);
164
165 // Get EmcRecPoint corresponding to this TrackSegment
166 Int_t emcRecPointIndex = ts->GetEmcIndex();
1212b8da 167
09286392 168 AliPHOSEmcRecPoint *emcRecPoint = gime->EmcRecPoint(emcRecPointIndex);
169
170 // Get the list of digits forming this EmcRecParticle
171 Int_t nDigits = emcRecPoint->GetDigitsMultiplicity();
172 Int_t *digitList = emcRecPoint->GetDigitsList();
e4ca05c3 173
09286392 174 // Find the digit with maximum amplitude
175 AliPHOSDigit *digit = 0;
176 Int_t maxAmp = 0;
177 Int_t bestDigitIndex = -1;
178 for (Int_t iDigit=0; iDigit<nDigits; iDigit++) {
1212b8da 179 digit = gime->Digit(digitList[iDigit]);
09286392 180 if (digit->GetAmp() > maxAmp) {
181 maxAmp = digit->GetAmp();
182 bestDigitIndex = iDigit;
183 }
184 }
ff309466 185 if (bestDigitIndex>-1)
186 digit = gime->Digit(digitList[bestDigitIndex]);
31804400 187 if (digit==0) return -12345;
188
c48a7283 189
09286392 190 // Get the list of primary tracks producing this digit
191 // and find which track has more track energy.
c48a7283 192 //Int_t nPrimary = digit->GetNprimary();
193 //TParticle *track = 0;
194 //Double_t energyEM = 0;
195 //Double_t energyHadron = 0;
196 //Int_t trackEM = -1;
197 //Int_t trackHadron = -1;
198 //for (Int_t iPrim=0; iPrim<nPrimary; iPrim++) {
199 // Int_t iPrimary = digit->GetPrimary(iPrim+1);
200 // if (iPrimary == -1 || TMath::Abs(iPrimary)>10000000)
201 // continue ; //PH 10000000 is the shift of the track
202 // //PH indexes in the underlying event
203 // track = gime->Primary(iPrimary);
204 // Int_t pdgCode = track->GetPdgCode();
205 // Double_t energy = track->Energy();
206 // if (pdgCode==22 || TMath::Abs(pdgCode)==11) {
207 // if (energy > energyEM) {
208 // energyEM = energy;
209 // trackEM = iPrimary;
210 // }
211 // }
212 // else {
213 // if (energy > energyHadron) {
214 // energyHadron = energy;
215 // trackHadron = iPrimary;
216 // }
217 // }
218 //}
219 // Preferences are given to electromagnetic tracks
220 //if (trackEM != -1) return trackEM; // track is gamma or e+-
221 //if (trackHadron != -1) return trackHadron; // track is hadron
222 //return -12345; // no track found :(
223
224
225 // Get the list of hits producing this digit,
226 // find which hit has deposited more energy
227 // and find the primary track.
228
229 AliPHOSHit *hit = 0;
230 TClonesArray *hits = gime->Hits();
25ed816e 231 if (hits==0) return -12345;
232
c48a7283 233 Double_t maxedep = 0;
234 Int_t maxtrack = -1;
235 Int_t nHits = hits ->GetEntries();
236 Int_t id = digit->GetId();
237
238 for (Int_t iHit=0; iHit<nHits; iHit++) {
239 hit = gime->Hit(iHit);
240 if(hit->GetId() == id){
241 Double_t edep = hit->GetEnergy();
242 Int_t track = hit->GetPrimary();
243 if(edep > maxedep){
244 maxedep = edep;
245 maxtrack = track;
09286392 246 }
247 }
248 }
c48a7283 249
250 if (maxtrack != -1) return maxtrack; // track is hadron
251 return -12345; // no track found :(
09286392 252}
253
254//____________________________________________________________________________
8f3968d8 255const TParticle * AliPHOSRecParticle::GetPrimary(Int_t index) const
256{
c81ced2d 257 // Get one of the primary particles at the origine of the RecParticle
a278df55 258 if ( index > GetNPrimariesToRecParticles() ) {
51d189f4 259 if (fDebug)
88cb7938 260 Warning("GetPrimary", "AliPHOSRecParticle::GetPrimary -> %d is larger that the number of primaries %d",
261 index, GetNPrimaries()) ;
262 return 0 ;
51d189f4 263 }
88cb7938 264 else {
265 Int_t dummy ;
266 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
267
268 Int_t emcRPindex = dynamic_cast<AliPHOSTrackSegment*>(gime->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
269 Int_t primaryindex = dynamic_cast<AliPHOSEmcRecPoint*>(gime->EmcRecPoints()->At(emcRPindex))->GetPrimaries(dummy)[index] ;
270 return gime->Primary(primaryindex) ;
271 }
fc7e2f43 272 // return 0 ;
8f3968d8 273}
948a4b24 274
06e774ed 275//____________________________________________________________________________
85c60a8e 276void AliPHOSRecParticle::SetPID(Int_t type, Float_t weight)
06e774ed 277{
cc1fe362 278 // Set the probability densities that this reconstructed particle
06e774ed 279 // has a type of i:
280 // i particle types
281 // ----------------------
282 // 0 electron
283 // 1 muon
284 // 2 pi+-
285 // 3 K+-
286 // 4 p/pbar
287 // 5 photon
288 // 6 pi0 at high pt
289 // 7 neutron
290 // 8 K0L
cc1fe362 291 // 9 Conversion electron
292
293 fPID[type] = weight ;
06e774ed 294}