1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
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 AliPHOSReconstructioner, 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,AliPHOSRecPoint * 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;
153 Double_t minDistance = 1e6;
154 Double_t pxyz[3], xyz[3];
156 for (Int_t iTrack=0; iTrack<nTracks; iTrack++) {
157 track = fESD->GetTrack(iTrack);
158 track->GetOuterXYZ(xyz); // track coord on the cylinder of PHOS radius
159 track->GetOuterPxPyPz(pxyz); // track momentum ibid.
160 vecDist = PropagateToCPV(xyz,pxyz,cpvClu->GetPHOSMod());
162 distance = TMath::Sqrt(vecDist.X()*vecDist.X() + vecDist.Z()*vecDist.Z());
163 // Find the closest track to the EMC recpoint
164 if (distance < minDistance) {
165 minDistance = distance;
166 iClosestTrack = iTrack;
170 if (iClosestTrack != -1) {
171 track = fESD->GetTrack(iClosestTrack);
172 track->GetOuterPxPyPz(pxyz); // track momentum ibid.
173 TVector3 vecCpvGlobal; // Global position of the CPV recpoint
174 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
175 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
176 geom->GetGlobal((AliRecPoint*)cpvClu,vecCpvGlobal);
177 for (Int_t ixyz=0; ixyz<3; ixyz++)
178 xyz[ixyz] = vecCpvGlobal[ixyz];
179 vecDist = PropagateToCPV(xyz,pxyz,cpvClu->GetPHOSMod());
181 distance = TMath::Sqrt(vecDist.X()*vecDist.X() + vecDist.Z()*vecDist.Z());
184 // If no ESD, than simply find EMC-CPV distance
185 distance = (vecCpv - vecEmc).Mag() ;
187 if(distance < fRcpv + 2*delta )
194 //____________________________________________________________________________
195 TVector3 AliPHOSTrackSegmentMakerv1::PropagateToCPV(Double_t *x, Double_t *p,
196 Int_t moduleNumber) const
198 // Propagate a straight-line track from the origin point x
199 // along the direction p to the CPV module moduleNumber
200 // Returns a local position of such a propagation
202 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
203 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
204 TVector3 moduleCenter = geom->GetCpvModuleCenter(moduleNumber);
206 TVector3 direction(p);
208 Double_t time = (moduleCenter.Mag2() - vertex.Dot(moduleCenter)) /
209 (direction.Dot(moduleCenter));
210 TVector3 globalIntersection = vertex + direction*time;
211 return geom->Global2LocalCpv(globalIntersection,moduleNumber);
214 //____________________________________________________________________________
215 void AliPHOSTrackSegmentMakerv1::Init()
217 // Make all memory allocations that are not possible in default constructor
219 AliPHOSGetter* gime = AliPHOSGetter::Instance(GetTitle(), fEventFolderName.Data());
221 fLinkUpArray = new TClonesArray("AliPHOSLink", 1000);
222 if ( !gime->TrackSegmentMaker() ) {
223 gime->PostTrackSegmentMaker(this);
227 //____________________________________________________________________________
228 void AliPHOSTrackSegmentMakerv1::InitParameters()
230 //Initializes parameters
237 fTrackSegmentsInRun = 0 ;
238 SetEventRange(0,-1) ;
242 //____________________________________________________________________________
243 void AliPHOSTrackSegmentMakerv1::MakeLinks()const
245 // Finds distances (links) between all EMC and PPSD clusters,
246 // which are not further apart from each other than fRcpv
247 // and sort them in accordance with this distance
249 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
250 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
251 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
253 fLinkUpArray->Clear() ;
255 AliPHOSRecPoint * cpv ;
256 AliPHOSEmcRecPoint * emcclu ;
261 for(iEmcRP = fEmcFirst; iEmcRP < fEmcLast; iEmcRP++ ) {
262 emcclu = dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(iEmcRP)) ;
266 for(iCpv = fCpvFirst; iCpv < fCpvLast;iCpv++ ) {
268 cpv = dynamic_cast<AliPHOSRecPoint *>(cpvRecPoints->At(iCpv)) ;
269 Float_t r = GetDistanceInPHOSPlane(emcclu, cpv, toofar) ;
274 new ((*fLinkUpArray)[iLinkUp++]) AliPHOSLink(r, iEmcRP, iCpv) ;
279 fLinkUpArray->Sort() ; //first links with smallest distances
282 //____________________________________________________________________________
283 void AliPHOSTrackSegmentMakerv1::MakePairs()
285 // Using the previously made list of "links", we found the smallest link - i.e.
286 // link with the least distance between EMC and CPV and pointing to still
287 // unassigned RecParticles. We assign these RecPoints to TrackSegment and
288 // remove them from the list of "unassigned".
290 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
292 TObjArray * emcRecPoints = gime->EmcRecPoints() ;
293 TObjArray * cpvRecPoints = gime->CpvRecPoints() ;
294 TClonesArray * trackSegments = gime->TrackSegments();
296 //Make arrays to mark clusters already chosen
297 Int_t * emcExist = 0;
298 if(fEmcLast > fEmcFirst)
299 emcExist = new Int_t[fEmcLast-fEmcFirst] ;
302 for(index = 0; index <fEmcLast-fEmcFirst; index ++)
303 emcExist[index] = 1 ;
305 Bool_t * cpvExist = 0;
306 if(fCpvLast > fCpvFirst)
307 cpvExist = new Bool_t[fCpvLast-fCpvFirst] ;
308 for(index = 0; index <fCpvLast-fCpvFirst; index ++)
309 cpvExist[index] = kTRUE ;
312 // Finds the smallest links and makes pairs of CPV and EMC clusters with smallest distance
313 TIter nextUp(fLinkUpArray) ;
315 AliPHOSLink * linkUp ;
317 AliPHOSRecPoint * nullpointer = 0 ;
319 while ( (linkUp = static_cast<AliPHOSLink *>(nextUp()) ) ){
321 if(emcExist[linkUp->GetEmc()-fEmcFirst] != -1){ //without ppsd Up yet
323 if(cpvExist[linkUp->GetPpsd()-fCpvFirst]){ //CPV still exist
325 new ((* trackSegments)[fNTrackSegments])
326 AliPHOSTrackSegment(dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(linkUp->GetEmc())) ,
327 dynamic_cast<AliPHOSRecPoint *>(cpvRecPoints->At(linkUp->GetPpsd()))) ;
328 (dynamic_cast<AliPHOSTrackSegment *>(trackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
331 emcExist[linkUp->GetEmc()-fEmcFirst] = -1 ; //Mark emc that Cpv was found
332 //mark CPV recpoint as already used
333 cpvExist[linkUp->GetPpsd()-fCpvFirst] = kFALSE ;
334 } //if ppsdUp still exist
338 //look through emc recPoints left without CPV/PPSD
339 if(emcExist){ //if there is emc rec point
341 for(iEmcRP = 0; iEmcRP < fEmcLast-fEmcFirst ; iEmcRP++ ){
342 if(emcExist[iEmcRP] > 0 ){
343 new ((*trackSegments)[fNTrackSegments])
344 AliPHOSTrackSegment(dynamic_cast<AliPHOSEmcRecPoint *>(emcRecPoints->At(iEmcRP+fEmcFirst)),
346 (dynamic_cast<AliPHOSTrackSegment *>(trackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
355 //____________________________________________________________________________
356 void AliPHOSTrackSegmentMakerv1::Exec(Option_t *option)
358 // Steering method to perform track segment construction for events
359 // in the range from fFirstEvent to fLastEvent.
360 // This range is optionally set by SetEventRange().
361 // if fLastEvent=-1 (by default), then process events until the end.
363 if(strstr(option,"tim"))
364 gBenchmark->Start("PHOSTSMaker");
366 if(strstr(option,"print")) {
371 AliPHOSGetter * gime = AliPHOSGetter::Instance(GetTitle()) ;
373 const AliPHOSGeometry * geom = gime->PHOSGeometry() ;
375 if (fLastEvent == -1) fLastEvent = gime->MaxEvent() - 1 ;
376 else fLastEvent = TMath::Min(fFirstEvent,gime->MaxEvent());
377 Int_t nEvents = fLastEvent - fFirstEvent + 1;
380 for (ievent = fFirstEvent; ievent <= fLastEvent; ievent++) {
381 gime->Event(ievent,"R") ;
382 //Make some initializations
383 fNTrackSegments = 0 ;
389 gime->TrackSegments()->Clear();
391 // if(!ReadRecPoints(ievent)) continue; //reads RecPoints for event ievent
393 for(fModule = 1; fModule <= geom->GetNModules() ; fModule++ ) {
399 WriteTrackSegments() ;
401 if(strstr(option,"deb"))
402 PrintTrackSegments(option);
404 //increment the total number of track segments per run
405 fTrackSegmentsInRun += gime->TrackSegments()->GetEntriesFast() ;
409 if(strstr(option,"tim")){
410 gBenchmark->Stop("PHOSTSMaker");
411 Info("Exec", "took %f seconds for making TS %f seconds per event",
412 gBenchmark->GetCpuTime("PHOSTSMaker"),
413 gBenchmark->GetCpuTime("PHOSTSMaker")/nEvents) ;
418 //____________________________________________________________________________
419 void AliPHOSTrackSegmentMakerv1::Unload()
421 // Unloads the task from the folder
422 AliPHOSGetter * gime = AliPHOSGetter::Instance() ;
423 gime->PhosLoader()->UnloadRecPoints() ;
424 gime->PhosLoader()->UnloadTracks() ;
427 //____________________________________________________________________________
428 void AliPHOSTrackSegmentMakerv1::Print()const
430 // Print TrackSegmentMaker parameters
432 TString message("") ;
433 if( strcmp(GetName(), "") != 0 ) {
434 message = "\n======== AliPHOSTrackSegmentMakerv1 ========\n" ;
435 message += "Making Track segments\n" ;
436 message += "with parameters:\n" ;
437 message += " Maximal EMC - CPV (PPSD) distance (cm) %f\n" ;
438 message += "============================================\n" ;
439 Info("Print", message.Data(),fRcpv) ;
442 Info("Print", "AliPHOSTrackSegmentMakerv1 not initialized ") ;
445 //____________________________________________________________________________
446 void AliPHOSTrackSegmentMakerv1::WriteTrackSegments()
448 // Writes found TrackSegments to TreeR. Creates branches
449 // "PHOSTS" and "AliPHOSTrackSegmentMaker" with the same title.
450 // In the former branch found TrackSegments are stored, while
451 // in the latter all parameters, with which TS were made.
452 // ROOT does not allow overwriting existing branches, therefore
453 // first we check, if branches with the same title already exist.
454 // If yes - exits without writing.
456 AliPHOSGetter *gime = AliPHOSGetter::Instance() ;
458 TClonesArray * trackSegments = gime->TrackSegments() ;
459 trackSegments->Expand(trackSegments->GetEntriesFast()) ;
461 TTree * treeT = gime->TreeT();
464 Int_t bufferSize = 32000 ;
465 TBranch * tsBranch = treeT->Branch("PHOSTS",&trackSegments,bufferSize);
468 gime->WriteTracks("OVERWRITE");
469 gime->WriteTrackSegmentMaker("OVERWRITE");
473 //____________________________________________________________________________
474 void AliPHOSTrackSegmentMakerv1::PrintTrackSegments(Option_t * option)
476 // option deb - prints # of found TrackSegments
477 // option deb all - prints as well indexed of found RecParticles assigned to the TS
479 TClonesArray * trackSegments = AliPHOSGetter::Instance()->TrackSegments() ;
481 Info("PrintTrackSegments", "Results from TrackSegmentMaker:") ;
482 printf("nevent: %d\n", gAlice->GetEvNumber()) ;
483 printf(" Found %d TrackSegments\n", trackSegments->GetEntriesFast() );
485 if(strstr(option,"all")) { // printing found TS
486 printf("TrackSegment # EMC RP# CPV RP#\n") ;
488 for (index = 0 ; index <trackSegments->GetEntriesFast() ; index++) {
489 AliPHOSTrackSegment * ts = (AliPHOSTrackSegment * )trackSegments->At(index) ;
490 printf(" %d %d %d \n", ts->GetIndexInList(), ts->GetEmcIndex(), ts->GetCpvIndex() ) ;