1 #include "AliHBTReaderTPC.h"
2 //______________________________________________
4 // class AliHBTReaderTPC
6 // reader for TPC tracking
7 // needs galice.root, AliTPCtracks.root, AliTPCclusters.root
9 // more info: http://aliweb.cern.ch/people/skowron/analyzer/index.html
10 // Piotr.Skowronski@cern.ch
12 ///////////////////////////////////////////////////////////////////////////
15 #include <TParticle.h>
20 #include <AliLoader.h>
23 #include <AliTPCtrack.h>
24 #include <AliTPCParam.h>
25 #include <AliTPCtracker.h>
26 #include <AliTPCLoader.h>
28 #include "AliHBTRun.h"
29 #include "AliHBTEvent.h"
30 #include "AliHBTParticle.h"
31 #include "AliHBTParticleCut.h"
33 ClassImp(AliHBTReaderTPC)
35 AliHBTReaderTPC::AliHBTReaderTPC():
36 fFileName("galice.root"),
40 fUseMagFFromRun(kTRUE),
43 fNChi2PerClustMin(0.0),
44 fNChi2PerClustMax(10e5),
50 // galicefilename = "" - this means: Do not open gAlice file -
51 // just leave the global pointer untouched
55 AliHBTReaderTPC::AliHBTReaderTPC(const Char_t* galicefilename):
56 fFileName(galicefilename),
60 fUseMagFFromRun(kTRUE),
63 fNChi2PerClustMin(0.0),
64 fNChi2PerClustMax(10e5),
70 // galicefilename = "" - this means: Do not open gAlice file -
71 // just leave the global pointer untouched
74 /********************************************************************/
75 AliHBTReaderTPC::AliHBTReaderTPC(TObjArray* dirs, const Char_t* galicefilename):
77 fFileName(galicefilename),
81 fUseMagFFromRun(kTRUE),
84 fNChi2PerClustMin(0.0),
85 fNChi2PerClustMax(10e5),
91 // galicefilename = "" - this means: Do not open gAlice file -
92 // just leave the global pointer untached
95 /********************************************************************/
97 AliHBTReaderTPC::~AliHBTReaderTPC()
100 if (AliHBTParticle::GetDebug())
102 Info("~AliHBTReaderTPC","deleting Run Loader");
103 AliLoader::SetDebug(AliHBTParticle::GetDebug());
108 if (AliHBTParticle::GetDebug())
110 Info("~AliHBTReaderTPC","deleting Run Loader Done");
113 /********************************************************************/
115 void AliHBTReaderTPC::Rewind()
122 /********************************************************************/
124 Int_t AliHBTReaderTPC::ReadNext()
126 //reads data and puts put to the particles and tracks objects
127 //reurns 0 if everything is OK
132 TObjArray *tarray = new TObjArray(5000); //cotainer for tpc tracks
133 tarray->SetOwner(); //set the ownership of the objects it contains
134 //when array is is deleted or cleared all objects
135 //that it contains are deleted
137 if (fParticlesEvent == 0x0) fParticlesEvent = new AliHBTEvent();
138 if (fTracksEvent == 0x0) fTracksEvent = new AliHBTEvent();
140 fParticlesEvent->Reset();
141 fTracksEvent->Reset();
143 do //do{}while; is OK even if 0 dirs specified. In that case we try to read from "./"
146 if (fRunLoader == 0x0)
147 if (OpenNextSession()) continue;//directory counter is increased inside in case of error
149 if (fCurrentEvent == fRunLoader->GetNumberOfEvents())
151 //read next directory
152 delete fRunLoader;//close current session
153 fRunLoader = 0x0;//assure pointer is null
154 fCurrentDir++;//go to next dir
155 continue;//directory counter is increased inside in case of error
158 Info("ReadNext","Reading Event %d",fCurrentEvent);
160 fRunLoader->GetEvent(fCurrentEvent);
161 TTree *tracktree = fTPCLoader->TreeT();//get the tree
162 if (!tracktree) //check if we got the tree
163 {//if not return with error
164 Error("ReadNext","Can't get a tree with TPC tracks !\n");
168 TBranch *trackbranch=tracktree->GetBranch("tracks");//get the branch with tracks
169 if (!trackbranch) ////check if we got the branch
170 {//if not return with error
171 Error("ReadNext","Can't get a branch with TPC tracks !\n");
174 Int_t ntpctracks=(Int_t)tracktree->GetEntries();//get number of TPC tracks
175 Info("ReadNext","Found %d TPC tracks.",ntpctracks);
176 //Copy tracks to array
178 AliTPCtrack *iotrack=0;
180 for (Int_t i=0; i<ntpctracks; i++) //loop over all tpc tracks
182 iotrack=new AliTPCtrack; //create new tracks
183 trackbranch->SetAddress(&iotrack); //tell the branch ehere to put track data from tree(file)
184 tracktree->GetEvent(i); //stream track i to the iotrack
185 tarray->AddLast(iotrack); //put the track in the array
190 Float_t phi, lam, pt;//angles and transverse momentum
191 Int_t label; //label of the current track
193 AliStack* stack = fRunLoader->Stack();
196 Error("ReadNext","Can not get stack for current event",fCurrentEvent);
202 for (Int_t i=0; i<ntpctracks; i++) //loop over all good tracks
204 iotrack = (AliTPCtrack*)tarray->At(i);
205 label = iotrack->GetLabel();
207 if (label < 0) continue;
209 if (CheckTrack(iotrack)) continue;
211 TParticle *p = (TParticle*)stack->Particle(label);
213 if(p == 0x0) continue; //if returned pointer is NULL
214 if(p->GetPDG() == 0x0) continue; //if particle has crezy PDG code (not known to our database)
216 if(Pass(p->GetPdgCode())) continue; //check if we are intersted with particles of this type
217 //if not take next partilce
219 AliHBTParticle* part = new AliHBTParticle(*p,i);
220 if(Pass(part)) { delete part; continue;}//check if meets all criteria of any of our cuts
221 //if it does not delete it and take next good track
223 // iotrack->PropagateTo(3.,0.0028,65.19);
224 // iotrack->PropagateToVertex(36.66,1.2e-3);//orig
225 iotrack->PropagateToVertex(50.,0.0353);
227 iotrack->GetExternalParameters(xk,par); //get properties of the track
229 phi=TMath::ASin(par[2]) + iotrack->GetAlpha();
230 if (phi<-TMath::Pi()) phi+=2*TMath::Pi();
231 if (phi>=TMath::Pi()) phi-=2*TMath::Pi();
233 pt=1.0/TMath::Abs(par[4]);
235 Double_t tpx = pt * TMath::Cos(phi); //track x coordinate of momentum
236 Double_t tpy = pt * TMath::Sin(phi); //track y coordinate of momentum
237 Double_t tpz = pt * lam; //track z coordinate of momentum
239 Double_t mass = p->GetMass();
240 Double_t tEtot = TMath::Sqrt( tpx*tpx + tpy*tpy + tpz*tpz + mass*mass);//total energy of the track
242 AliHBTParticle* track = new AliHBTParticle(p->GetPdgCode(),i, tpx, tpy , tpz, tEtot, 0., 0., 0., 0.);
243 if(Pass(track))//check if meets all criteria of any of our cuts
244 //if it does not delete it and take next good track
250 fParticlesEvent->AddParticle(part);
251 fTracksEvent->AddParticle(track);
254 Info("ReadNext","Read %d tracks and %d particles from event %d (event %d in dir %d).",
255 fParticlesEvent->GetNumberOfParticles(), fTracksEvent->GetNumberOfParticles(),
256 fNEventsRead,fCurrentEvent,fCurrentDir);
262 }while(fCurrentDir < GetNumberOfDirs());
267 /********************************************************************/
269 Int_t AliHBTReaderTPC::OpenNextSession()
271 TString filename = GetDirName(fCurrentDir);
272 if (filename.IsNull())
274 DoOpenError("Can not get directory name");
277 filename = filename +"/"+ fFileName;
278 fRunLoader = AliRunLoader::Open(filename,AliConfig::fgkDefaultEventFolderName);
279 if( fRunLoader == 0x0)
281 DoOpenError("Can not open session.");
285 fRunLoader->LoadHeader();
286 if (fRunLoader->GetNumberOfEvents() <= 0)
288 DoOpenError("There is no events in this directory.");
292 if (fRunLoader->LoadKinematics())
294 DoOpenError("Error occured while loading kinematics.");
297 fTPCLoader = (AliTPCLoader*)fRunLoader->GetLoader("TPCLoader");
298 if ( fTPCLoader == 0x0)
300 DoOpenError("Exiting due to problems with opening files.");
303 Info("OpenNextSession","________________________________________________________");
304 Info("OpenNextSession","Found %d event(s) in directory %s",
305 fRunLoader->GetNumberOfEvents(),GetDirName(fCurrentDir).Data());
309 fRunLoader->LoadgAlice();
310 mf = fRunLoader->GetAliRun()->Field()->SolenoidField();
311 Info("OpenNextSession","Setting Magnetic Field from run: B=%fT",mf/10.);
312 fRunLoader->UnloadgAlice();
316 Info("OpenNextSession","Setting Own Magnetic Field: B=%fT",fMagneticField);
317 if (fMagneticField == 0x0)
319 Fatal("OpenNextSession","Magnetic field can not be 0.");
322 mf = fMagneticField*10.;
324 AliKalmanTrack::SetConvConst(1000/0.299792458/mf);
327 fRunLoader->CdGAFile();
328 AliTPCParam *TPCParam= (AliTPCParam*)gDirectory->Get("75x40_100x60");
331 TPCParam=(AliTPCParam *)gDirectory->Get("75x40_100x60_150x60");
334 DoOpenError("TPC parameters have not been found !\n");
339 if (fTPCLoader->LoadTracks())
341 DoOpenError("Error occured while loading TPC tracks.");
348 /********************************************************************/
350 void AliHBTReaderTPC::DoOpenError( const char *va_(fmt), ...)
352 // Does error display and clean-up in case error caught on Open Next Session
355 va_start(ap,va_(fmt));
356 Error("OpenNextSession", va_(fmt), ap);
365 /********************************************************************/
366 Bool_t AliHBTReaderTPC::CheckTrack(AliTPCtrack* t)
368 //Performs check of the track
369 if ( (t->GetNumberOfClusters() > fNClustMax) || (t->GetNumberOfClusters() < fNClustMin) ) return kTRUE;
372 t->GetCovariance(cc);
373 if ( (cc[9] < fC44Min) || (cc[9] > fC44Max) ) return kTRUE;
375 Float_t chisqpercl = t->GetChi2()/((Double_t)t->GetNumberOfClusters());
376 if ( (chisqpercl < fNChi2PerClustMin) || (chisqpercl > fNChi2PerClustMax) ) return kTRUE;
381 /********************************************************************/
383 void AliHBTReaderTPC::SetNClustersRange(Int_t min,Int_t max)
385 //sets range of Number Of Clusters that tracks have to have
389 /********************************************************************/
391 void AliHBTReaderTPC::SetChi2PerCluserRange(Float_t min, Float_t max)
393 //sets range of Chi2 per Cluster
394 fNChi2PerClustMin = min;
395 fNChi2PerClustMax = max;
397 /********************************************************************/
399 void AliHBTReaderTPC::SetC44Range(Float_t min, Float_t max)
401 //Sets range of C44 parameter of covariance matrix of the track
402 //it defines uncertainty of the momentum
407 /********************************************************************/
408 /********************************************************************/
409 /********************************************************************/
412 void (AliTPCtrack* iotrack, Double_t curv)
415 iotrack->GetExternalPara
417 Double_t fP4=iotrack->GetC();
418 Double_t fP2=iotrack->GetEta();
420 Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fP0, z1=fP1;
421 Double_t c1=fP4*x1 - fP2, r1=sqrt(1.- c1*c1);
422 Double_t c2=fP4*x2 - fP2, r2=sqrt(1.- c2*c2);
424 fP0 += dx*(c1+c2)/(r1+r2);
425 fP1 += dx*(c1+c2)/(c1*r2 + c2*r1)*fP3;