1 #include "AliHBTParticle.h"
2 //___________________________________________________________
3 /////////////////////////////////////////////////////////////
5 // class AliHBTParticle
7 // Ali HBT Particle: simplified class TParticle
8 // Simplified in order to minimize the size of object
9 // - we want to keep a lot of such a objects in memory
10 // Additionaly adjusted for HBT Analysies purposes
12 /////////////////////////////////////////////////////////////
13 #include <TParticle.h>
15 #include "AliHBTTrackPoints.h"
17 ClassImp(AliHBTParticle)
19 Int_t AliHBTParticle::fgDebug = 0;
20 //______________________________________________________________________________
21 AliHBTParticle::AliHBTParticle():
22 fPdgIdx(0), fIdxInEvent(0),fNPids(0),fPids(0x0),fPidProb(0x0),
23 fCalcMass(0),fPx(0), fPy(0),fPz(0),fE(0), fVx(0), fVy(0),fVz(0),fVt(0),
27 //______________________________________________________________________________
29 AliHBTParticle::AliHBTParticle(Int_t pdg, Int_t idx,
30 Double_t px, Double_t py, Double_t pz, Double_t etot,
31 Double_t vx, Double_t vy, Double_t vz, Double_t time):
32 fPdgIdx(0), fIdxInEvent(idx),fNPids(0),fPids(0x0),fPidProb(0x0),
34 fPx(px), fPy(py),fPz(pz),fE(etot),
35 fVx(vx), fVy(vy),fVz(vz),fVt(time),
41 fCalcMass = GetPDG()->Mass();
43 Double_t a2 = fE*fE -fPx*fPx -fPy*fPy -fPz*fPz;
44 if (a2 >= 0) fCalcMass = TMath::Sqrt(a2);
45 else fCalcMass = -TMath::Sqrt(-a2);
48 //______________________________________________________________________________
50 AliHBTParticle::AliHBTParticle(Int_t pdg, Float_t prob, Int_t idx,
51 Double_t px, Double_t py, Double_t pz, Double_t etot,
52 Double_t vx, Double_t vy, Double_t vz, Double_t time):
53 fPdgIdx(0), fIdxInEvent(idx),fNPids(0),fPids(0x0),fPidProb(0x0),
55 fPx(px), fPy(py),fPz(pz),fE(etot),
56 fVx(vx), fVy(vy),fVz(vz),fVt(time),
62 fCalcMass = GetPDG()->Mass();
64 Double_t a2 = fE*fE -fPx*fPx -fPy*fPy -fPz*fPz;
65 if (a2 >= 0) fCalcMass = TMath::Sqrt(a2);
66 else fCalcMass = -TMath::Sqrt(-a2);
69 //______________________________________________________________________________
70 AliHBTParticle::AliHBTParticle(const AliHBTParticle& in):
72 fPdgIdx(in.fPdgIdx), fIdxInEvent(in.fIdxInEvent),
73 fNPids(in.fNPids),fPids(new Int_t[fNPids]),fPidProb(new Float_t[fNPids]),
74 fCalcMass(in.GetCalcMass()),
75 fPx(in.Px()),fPy(in.Py()),fPz(in.Pz()),fE(in.Energy()),
76 fVx(in.Vx()),fVy(in.Vy()),fVz(in.Vz()),fVt(in.T())
79 for(Int_t i = 0; i<fNPids; i++)
81 fPids[i] = in.fPids[i];
82 fPidProb[i] = in.fPidProb[i];
85 fTrackPoints = (in.fTrackPoints)?(AliHBTTrackPoints*)fTrackPoints->Clone():0x0;
89 //______________________________________________________________________________
90 AliHBTParticle::AliHBTParticle(const TParticle &p,Int_t idx):
91 fPdgIdx(0), fIdxInEvent(idx),
92 fNPids(0),fPids(0x0),fPidProb(0x0),
93 fCalcMass(p.GetCalcMass()),
94 fPx(p.Px()),fPy(p.Py()),fPz(p.Pz()),fE(p.Energy()),
95 fVx(p.Vx()),fVy(p.Vy()),fVz(p.Vz()),fVt(p.T()),
98 //all copied in the initialization
99 SetPdgCode(p.GetPdgCode());
101 //______________________________________________________________________________
103 AliHBTParticle::~AliHBTParticle()
110 //______________________________________________________________________________
112 AliHBTParticle& AliHBTParticle::operator=(const AliHBTParticle& in)
119 Int_t* fPids = new Int_t[fNPids];
120 Float_t* fPidProb = new Float_t[fNPids];
121 for (Int_t i = 0; i < fNPids;i++)
123 fPids[i] = in.fPids[i];
124 fPidProb[i] = in.fPidProb[i];
127 fPdgIdx = in.fPdgIdx;
128 fIdxInEvent = in.fIdxInEvent;
129 fCalcMass = in.GetCalcMass();
140 fTrackPoints = (in.fTrackPoints)?(AliHBTTrackPoints*)fTrackPoints->Clone():0x0;
144 //______________________________________________________________________________
146 void AliHBTParticle::SetPdgCode(Int_t pdg,Float_t prob)
148 SetPIDprobability(pdg,prob);
149 fPdgIdx = GetPidSlot(pdg);
152 //______________________________________________________________________________
153 void AliHBTParticle::SetPIDprobability(Int_t pdg, Float_t prob)
155 //Sets another pdg code and corresponding probabilty
156 //Ids are set in decreasing order
157 //Check if total prbaility is not ivercoming unity is performed
158 //in case, warning is printed
159 if (fgDebug > 9) Info("SetPIDprobability","Setting PID %d prob %f",pdg,prob);
161 Float_t totprob = 0.0;//sums up probabilities
162 Int_t idx = GetPidSlot(pdg);
166 fPidProb[idx] = prob;
167 for (i = 0; i < fNPids;i++) totprob+=fPidProb[i];
168 if (totprob > (1.0+0.000001))
170 Warning("SetPIDprobability","Total probability greater than unity (%f)",totprob);
174 Info("SetPIDprobability","Current Total probability: %f",totprob);
179 Int_t currentpid = GetPdgCode();
181 Float_t* aPidProbNew = new Float_t[fNPids];
182 Int_t* aPidsNew = new Int_t[fNPids];
184 for (i = 0; i < fNPids-1;i++)//find a slot
186 if ( fPidProb[i] > prob)
188 if (fgDebug>9) Info("SetPID","Copying entry %d",i);
189 aPidProbNew[i] = fPidProb[i];
190 aPidsNew[i] = fPids[i];
191 totprob+=fPidProb[i];
196 if (fgDebug > 9) Info("SetPID","Setting new PID on entry %d",i);
197 aPidProbNew[i] = prob;
202 for (Int_t j = fNPids-1; j > i ;j--)//copy rest of old araays
204 if (fgDebug > 9) Info("SetPID","Copying from old entry %d to new entry %d",j-1,j);
205 aPidProbNew[j] = fPidProb[j-1];
206 aPidsNew[j] = fPids[j-1];
207 totprob+=fPidProb[j-1];
213 fPidProb = aPidProbNew;
216 fPdgIdx = GetPidSlot(currentpid);
217 if (fPdgIdx == -1) fPdgIdx = 0;
219 if (totprob > (1.0+0.000001))//place for numerical error
221 Warning("SetId","Total probability is greater than unity (%f)!!!",totprob);
225 //______________________________________________________________________________
227 Float_t AliHBTParticle::GetPIDprobability(Int_t pdg)
229 Int_t idx = GetPidSlot(pdg);
230 if (idx < 0) return 0.0;//such pid was not specified for this particle
231 return fPidProb[idx];
233 //______________________________________________________________________________
235 const Char_t* AliHBTParticle::GetName() const
237 static char def[4] = "XXX";
238 const TParticlePDG *ap = TDatabasePDG::Instance()->GetParticle(GetPdgCode());
239 if (ap) return ap->GetName();
244 //______________________________________________________________________________
245 Int_t AliHBTParticle::GetPidSlot(Int_t pdg) const
247 //returns position of the given PID in fPids (and fPidProb) array.
248 if (fPids == 0x0) return -1;
249 for (Int_t i = 0; i< fNPids; i++)
251 if (fPids[i] == pdg) return i;
255 //______________________________________________________________________________
257 Int_t AliHBTParticle::GetNthPid(Int_t idx) const
259 //returns PID sitting on slot idx in fPids
260 if ( (idx < 0) || (idx >= fNPids) )
262 Error("GetNthPid","Out Of Bounds");
267 //______________________________________________________________________________
269 Float_t AliHBTParticle::GetNthPidProb(Int_t idx) const
271 //returns PID sitting on slot idx in fPidProb
272 if ( (idx < 0) || (idx >= fNPids) )
274 Error("GetNthPid","Out Of Bounds");
277 return fPidProb[idx];
279 //______________________________________________________________________________
281 void AliHBTParticle::Print() const
283 //prints information about particle
284 printf("____________________________________________________\n");
285 printf("Idx: %d PID: %d Name: ",fIdxInEvent,GetPdgCode());
286 TParticlePDG *pdgp = TDatabasePDG::Instance()->GetParticle(GetPdgCode());
289 printf("%s Mass: %f\n",pdgp->GetName(),pdgp->Mass());
293 printf("Not known\n");
296 printf("Px: %+f Py: %+f Pz: %+f E: %+f Calculated Mass: %f\nVx: %+f Vy: %+f Vz: %+f T: %+f\n",
297 Px(),Py(),Pz(),Energy(),GetCalcMass(),Vx(),Vy(),Vz(),T());
299 for (Int_t i = 0; i < fNPids; i++)
301 printf("# %d PID: %d Probability %f name ",i,fPids[i],fPidProb[i]);
302 const TParticlePDG *ap = TDatabasePDG::Instance()->GetParticle(fPids[i]);
305 printf("%s Mass %f\n",ap->GetName(),ap->Mass());
309 printf("Not known\n");
314 //______________________________________________________________________________
316 //void AliHBTParticle::Streamer(TBuffer &b)
318 // // Stream all objects in the array to or from the I/O buffer.
319 // UInt_t R__s, R__c;
321 // if (b.IsReading())
324 // delete [] fPidProb;
326 // Version_t v = b.ReadVersion(&R__s, &R__c);
329 // AliHBTParticle::Class()->ReadBuffer(b, this);
333 // TObject::Streamer(b);
338 // Int_t* fPids = new Int_t[fNPids];
339 // Float_t* fPidProb = new Float_t[fNPids];
340 // for (i = 0;i<fNPids;i++)
344 // for (i = 0;i<fNPids;i++)
359 // Info("Streamer","Read data");
363 // b.CheckByteCount(R__s, R__c,AliHBTParticle::IsA());
367 // R__c = b.WriteVersion(AliHBTParticle::IsA(), kTRUE);
368 // TObject::Streamer(b);
369 // Info("Streamer","Read data");
375 // for (i = 0;i<fNPids;i++)
381 // for (i = 0;i<fNPids;i++)
397 // b.SetByteCount(R__c, kTRUE);