1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
16 //_________________________________________________________________________
17 // Implementation version 1 of algorithm class to construct PHOS track segments
18 // Track segment for PHOS is list of
19 // EMC RecPoint + (possibly) CPV RecPoint + (possibly) PPSD RecPoint
20 // To find TrackSegments we do the following:
21 // for each EMC RecPoints we look at
22 // CPV/PPSD RecPoints in the radious fRcpv.
23 // If there is such a CPV RecPoint,
24 // we make "Link" it is just indexes of EMC and CPV/PPSD RecPoint and distance
25 // between them in the PHOS plane.
26 // Then we sort "Links" and starting from the
27 // least "Link" pointing to the unassined EMC and CPV RecPoints assing them to
29 // If there is no CPV/PPSD RecPoint we make TrackSegment
30 // consisting from EMC alone. There is no TrackSegments without EMC RecPoint.
31 //// In principle this class should be called from AliPHOSReconstructor, but
32 // one can use it as well in standalone mode.
34 // root [0] AliPHOSTrackSegmentMakerv1 * t = new AliPHOSTrackSegmentMaker("galice.root", "tracksegmentsname", "recpointsname")
35 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
36 // // reads gAlice from header file "galice.root", uses recpoints stored in the branch names "recpointsname" (default = "Default")
37 // // and saves recpoints in branch named "tracksegmentsname" (default = "recpointsname")
38 // root [1] t->ExecuteTask()
39 // root [2] t->SetMaxEmcPpsdDistance(5)
40 // root [3] t->SetTrackSegmentsBranch("max distance 5 cm")
41 // root [4] t->ExecuteTask("deb all time")
43 //*-- Author: Dmitri Peressounko (RRC Ki & SUBATECH) & Yves Schutz (SUBATECH)
46 // --- ROOT system ---
48 #include "TBenchmark.h"
50 // --- Standard library ---
52 // --- AliRoot header files ---
53 #include "AliPHOSGeometry.h"
54 #include "AliPHOSTrackSegmentMakerv1.h"
55 #include "AliPHOSTrackSegment.h"
56 #include "AliPHOSLink.h"
57 #include "AliPHOSGetter.h"
59 #include "AliESDtrack.h"
61 ClassImp( AliPHOSTrackSegmentMakerv1)
64 //____________________________________________________________________________
65 AliPHOSTrackSegmentMakerv1::AliPHOSTrackSegmentMakerv1() : AliPHOSTrackSegmentMaker()
67 // default ctor (to be used mainly by Streamer)
70 fDefaultInit = kTRUE ;
73 //____________________________________________________________________________
74 AliPHOSTrackSegmentMakerv1::AliPHOSTrackSegmentMakerv1(const TString alirunFileName, const TString eventFolderName)
75 :AliPHOSTrackSegmentMaker(alirunFileName, eventFolderName)
81 fDefaultInit = kFALSE ;
85 //____________________________________________________________________________
86 AliPHOSTrackSegmentMakerv1::~AliPHOSTrackSegmentMakerv1()
89 // fDefaultInit = kTRUE if TrackSegmentMaker created by default ctor (to get just the parameters)
95 //____________________________________________________________________________
96 const TString AliPHOSTrackSegmentMakerv1::BranchName() const
102 //____________________________________________________________________________
103 void AliPHOSTrackSegmentMakerv1::FillOneModule()
105 // Finds first and last indexes between which
106 // clusters from one PHOS module are
108 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
110 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
111 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
114 Int_t totalEmc = emcRecPoints->GetEntriesFast() ;
115 for(fEmcFirst = fEmcLast; (fEmcLast < totalEmc) &&
116 ((dynamic_cast<AliPHOSRecPoint *>(emcRecPoints->At(fEmcLast)))->GetPHOSMod() == fModule );
120 Int_t totalCpv = cpvRecPoints->GetEntriesFast() ;
122 for(fCpvFirst = fCpvLast; (fCpvLast < totalCpv) &&
123 ((dynamic_cast<AliPHOSRecPoint *>(cpvRecPoints->At(fCpvLast)))->GetPHOSMod() == fModule );
128 //____________________________________________________________________________
129 Float_t AliPHOSTrackSegmentMakerv1::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcClu,AliPHOSCpvRecPoint * cpvClu, Bool_t &toofar) const
131 // Calculates the distance between the EMC RecPoint and the PPSD RecPoint
132 // Clusters are sorted in "rows" and "columns" of width 1 cm
134 Float_t delta = 1 ; // Width of the rows in sorting of RecPoints (in cm)
135 // if you change this value, change it as well in xxxRecPoint::Compare()
136 Float_t distance = fRcpv ;
138 TVector3 vecEmc ; // Local position of EMC recpoint
139 TVector3 vecCpv ; // Local position of CPV recpoint propagated to EMC
140 TVector3 vecDist ; // Distance between local positions of two points
142 emcClu->GetLocalPosition(vecEmc) ;
143 cpvClu->GetLocalPosition(vecCpv) ;
146 if(emcClu->GetPHOSMod() == cpvClu->GetPHOSMod()){
149 // Extrapolate the global track direction if any to CPV and find the closest track
150 Int_t nTracks = fESD->GetNumberOfTracks();
151 Int_t iClosestTrack = -1;
152 Double_t minDistance = 1e6;
153 Double_t pxyz[3], xyz[3];
155 for (Int_t iTrack=0; iTrack<nTracks; iTrack++) {
156 track = fESD->GetTrack(iTrack);
157 track->GetOuterXYZ(xyz); // track coord on the cylinder of PHOS radius
158 if ((TMath::Abs(xyz[0])+TMath::Abs(xyz[1])+TMath::Abs(xyz[2]))<=0)
160 track->GetOuterPxPyPz(pxyz); // track momentum ibid.
161 vecDist = PropagateToPlane(xyz,pxyz,"CPV",cpvClu->GetPHOSMod());
162 // Info("GetDistanceInPHOSPlane","Track %d propagation to CPV = (%f,%f,%f)",
163 // iTrack,vecDist.X(),vecDist.Y(),vecDist.Z());
165 distance = TMath::Sqrt(vecDist.X()*vecDist.X() + vecDist.Z()*vecDist.Z());
166 // Find the closest track to the EMC recpoint
167 if (distance < minDistance) {
168 minDistance = distance;
169 iClosestTrack = iTrack;
173 if (iClosestTrack != -1) {
174 track = fESD->GetTrack(iClosestTrack);
175 track->GetOuterPxPyPz(pxyz); // track momentum ibid.
176 TVector3 vecCpvGlobal; // Global position of the CPV recpoint
177 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
178 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
179 geom->GetGlobal((AliRecPoint*)cpvClu,vecCpvGlobal);
180 for (Int_t ixyz=0; ixyz<3; ixyz++)
181 xyz[ixyz] = vecCpvGlobal[ixyz];
182 vecDist = PropagateToPlane(xyz,pxyz,"EMC",cpvClu->GetPHOSMod());
183 // Info("GetDistanceInPHOSPlane","Track %d propagation to EMC = (%f,%f,%f)",
184 // iClosestTrack,vecDist.X(),vecDist.Y(),vecDist.Z());
186 distance = TMath::Sqrt(vecDist.X()*vecDist.X() + vecDist.Z()*vecDist.Z());
189 // If no ESD exists, than simply find EMC-CPV distance
190 distance = (vecCpv - vecEmc).Mag() ;
192 // Info("GetDistanceInPHOSPlane","cpv-emc distance is %f cm",
194 if(distance < fRcpv + 2*delta )
201 //____________________________________________________________________________
202 TVector3 AliPHOSTrackSegmentMakerv1::PropagateToPlane(Double_t *x, Double_t *p,
203 char *det, Int_t moduleNumber) const
205 // Propagate a straight-line track from the origin point x
206 // along the direction p to the CPV or EMC module moduleNumber
207 // Returns a local position of such a propagation
209 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
210 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
211 TVector3 moduleCenter = geom->GetModuleCenter(det,moduleNumber);
213 TVector3 direction(p);
215 // Info("PropagateToCPV","Center of the %s module %d is (%f,%f,%f)",
216 // det,moduleNumber,moduleCenter[0],moduleCenter[1],moduleCenter[2]);
218 Double_t time = (moduleCenter.Mag2() - vertex.Dot(moduleCenter)) /
219 (direction.Dot(moduleCenter));
220 TVector3 globalIntersection = vertex + direction*time;
221 return geom->Global2Local(globalIntersection,moduleNumber);
224 //____________________________________________________________________________
225 void AliPHOSTrackSegmentMakerv1::Init()
227 // Make all memory allocations that are not possible in default constructor
229 AliPHOSGetter* gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data());
231 fLinkUpArray = new TClonesArray("AliPHOSLink", 1000);
232 if ( !gime->TrackSegmentMaker() ) {
233 gime->PostTrackSegmentMaker(this);
237 //____________________________________________________________________________
238 void AliPHOSTrackSegmentMakerv1::InitParameters()
240 //Initializes parameters
247 fTrackSegmentsInRun = 0 ;
248 SetEventRange(0,-1) ;
252 //____________________________________________________________________________
253 void AliPHOSTrackSegmentMakerv1::MakeLinks()const
255 // Finds distances (links) between all EMC and PPSD clusters,
256 // which are not further apart from each other than fRcpv
257 // and sort them in accordance with this distance
259 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
260 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
261 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
263 fLinkUpArray->Clear() ;
265 AliPHOSCpvRecPoint * cpv ;
266 AliPHOSEmcRecPoint * emcclu ;
271 for(iEmcRP = fEmcFirst; iEmcRP < fEmcLast; iEmcRP++ ) {
272 emcclu = dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(iEmcRP)) ;
276 for(iCpv = fCpvFirst; iCpv < fCpvLast;iCpv++ ) {
278 cpv = dynamic_cast<AliPHOSCpvRecPoint *>(cpvRecPoints->At(iCpv)) ;
279 Float_t r = GetDistanceInPHOSPlane(emcclu, cpv, toofar) ;
284 new ((*fLinkUpArray)[iLinkUp++]) AliPHOSLink(r, iEmcRP, iCpv) ;
289 fLinkUpArray->Sort() ; //first links with smallest distances
292 //____________________________________________________________________________
293 void AliPHOSTrackSegmentMakerv1::MakePairs()
295 // Using the previously made list of "links", we found the smallest link - i.e.
296 // link with the least distance between EMC and CPV and pointing to still
297 // unassigned RecParticles. We assign these RecPoints to TrackSegment and
298 // remove them from the list of "unassigned".
300 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
302 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
303 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
304 TClonesArray * trackSegments = gime->TrackSegments();
306 //Make arrays to mark clusters already chosen
307 Int_t * emcExist = 0;
308 if(fEmcLast > fEmcFirst)
309 emcExist = new Int_t[fEmcLast-fEmcFirst] ;
312 for(index = 0; index <fEmcLast-fEmcFirst; index ++)
313 emcExist[index] = 1 ;
315 Bool_t * cpvExist = 0;
316 if(fCpvLast > fCpvFirst)
317 cpvExist = new Bool_t[fCpvLast-fCpvFirst] ;
318 for(index = 0; index <fCpvLast-fCpvFirst; index ++)
319 cpvExist[index] = kTRUE ;
322 // Finds the smallest links and makes pairs of CPV and EMC clusters with smallest distance
323 TIter nextUp(fLinkUpArray) ;
325 AliPHOSLink * linkUp ;
327 AliPHOSCpvRecPoint * nullpointer = 0 ;
329 while ( (linkUp = static_cast<AliPHOSLink *>(nextUp()) ) ){
331 if(emcExist[linkUp->GetEmc()-fEmcFirst] != -1){ //without ppsd Up yet
333 if(cpvExist[linkUp->GetPpsd()-fCpvFirst]){ //CPV still exist
335 new ((* trackSegments)[fNTrackSegments])
336 AliPHOSTrackSegment(dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(linkUp->GetEmc())) ,
337 dynamic_cast<AliPHOSCpvRecPoint *>(cpvRecPoints->At(linkUp->GetPpsd()))) ;
338 (dynamic_cast<AliPHOSTrackSegment *>(trackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
341 emcExist[linkUp->GetEmc()-fEmcFirst] = -1 ; //Mark emc that Cpv was found
342 //mark CPV recpoint as already used
343 cpvExist[linkUp->GetPpsd()-fCpvFirst] = kFALSE ;
344 } //if ppsdUp still exist
348 //look through emc recPoints left without CPV/PPSD
349 if(emcExist){ //if there is emc rec point
351 for(iEmcRP = 0; iEmcRP < fEmcLast-fEmcFirst ; iEmcRP++ ){
352 if(emcExist[iEmcRP] > 0 ){
353 new ((*trackSegments)[fNTrackSegments])
354 AliPHOSTrackSegment(dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(iEmcRP+fEmcFirst)),
356 (dynamic_cast<AliPHOSTrackSegment *>(trackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
365 //____________________________________________________________________________
366 void AliPHOSTrackSegmentMakerv1::Exec(Option_t *option)
368 // Steering method to perform track segment construction for events
369 // in the range from fFirstEvent to fLastEvent.
370 // This range is optionally set by SetEventRange().
371 // if fLastEvent=-1 (by default), then process events until the end.
373 if(strstr(option,"tim"))
374 gBenchmark->Start("PHOSTSMaker");
376 if(strstr(option,"print")) {
381 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
383 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
385 if (fLastEvent == -1) fLastEvent = gime->MaxEvent() - 1 ;
386 else fLastEvent = TMath::Min(fFirstEvent,gime->MaxEvent());
387 Int_t nEvents = fLastEvent - fFirstEvent + 1;
390 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
391 gime->Event(ievent,"R") ;
392 //Make some initializations
393 fNTrackSegments = 0 ;
399 gime->TrackSegments()->Clear();
401 // if(!ReadRecPoints(ievent)) continue; //reads RecPoints for event ievent
403 for(fModule = 1; fModule <= geom->GetNModules() ; fModule++ ) {
409 WriteTrackSegments() ;
411 if(strstr(option,"deb"))
412 PrintTrackSegments(option);
414 //increment the total number of track segments per run
415 fTrackSegmentsInRun += gime->TrackSegments()->GetEntriesFast() ;
419 if(strstr(option,"tim")){
420 gBenchmark->Stop("PHOSTSMaker");
421 Info("Exec", "took %f seconds for making TS %f seconds per event",
422 gBenchmark->GetCpuTime("PHOSTSMaker"),
423 gBenchmark->GetCpuTime("PHOSTSMaker")/nEvents) ;
428 //____________________________________________________________________________
429 void AliPHOSTrackSegmentMakerv1::Unload()
431 // Unloads the task from the folder
432 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
433 gime->PhosLoader()->UnloadRecPoints() ;
434 gime->PhosLoader()->UnloadTracks() ;
437 //____________________________________________________________________________
438 void AliPHOSTrackSegmentMakerv1::Print()const
440 // Print TrackSegmentMaker parameters
442 TString message("") ;
443 if( strcmp(GetName(), "") != 0 ) {
444 message = "\n======== AliPHOSTrackSegmentMakerv1 ========\n" ;
445 message += "Making Track segments\n" ;
446 message += "with parameters:\n" ;
447 message += " Maximal EMC - CPV (PPSD) distance (cm) %f\n" ;
448 message += "============================================\n" ;
449 Info("Print", message.Data(),fRcpv) ;
452 Info("Print", "AliPHOSTrackSegmentMakerv1 not initialized ") ;
455 //____________________________________________________________________________
456 void AliPHOSTrackSegmentMakerv1::WriteTrackSegments()
458 // Writes found TrackSegments to TreeR. Creates branches
459 // "PHOSTS" and "AliPHOSTrackSegmentMaker" with the same title.
460 // In the former branch found TrackSegments are stored, while
461 // in the latter all parameters, with which TS were made.
462 // ROOT does not allow overwriting existing branches, therefore
463 // first we check, if branches with the same title already exist.
464 // If yes - exits without writing.
466 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
468 TClonesArray * trackSegments = gime->TrackSegments() ;
469 trackSegments->Expand(trackSegments->GetEntriesFast()) ;
471 TTree * treeT = gime->TreeT();
474 Int_t bufferSize = 32000 ;
475 TBranch * tsBranch = treeT->Branch("PHOSTS",&trackSegments,bufferSize);
478 gime->WriteTracks("OVERWRITE");
479 gime->WriteTrackSegmentMaker("OVERWRITE");
483 //____________________________________________________________________________
484 void AliPHOSTrackSegmentMakerv1::PrintTrackSegments(Option_t * option)
486 // option deb - prints # of found TrackSegments
487 // option deb all - prints as well indexed of found RecParticles assigned to the TS
489 TClonesArray * trackSegments = AliPHOSGetter::Instance()->TrackSegments() ;
491 Info("PrintTrackSegments", "Results from TrackSegmentMaker:") ;
492 printf("nevent: %d\n", gAlice->GetEvNumber()) ;
493 printf(" Found %d TrackSegments\n", trackSegments->GetEntriesFast() );
495 if(strstr(option,"all")) { // printing found TS
496 printf("TrackSegment # EMC RP# CPV RP#\n") ;
498 for (index = 0 ; index <trackSegments->GetEntriesFast() ; index++) {
499 AliPHOSTrackSegment * ts = (AliPHOSTrackSegment * )trackSegments->At(index) ;
500 printf(" %d %d %d \n", ts->GetIndexInList(), ts->GetEmcIndex(), ts->GetCpvIndex() ) ;