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4 * Author: The ALICE Off-line Project. *
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14 **************************************************************************/
17 /* History of cvs commits:
20 * Revision 1.6 2007/08/22 09:20:50 hristov
21 * Updated QA classes (Yves)
23 * Revision 1.5 2007/07/11 13:43:30 hristov
24 * New class AliESDEvent, backward compatibility with the old AliESD (Christian)
26 * Revision 1.4 2007/05/04 14:49:29 policheh
27 * AliPHOSRecPoint inheritance from AliCluster
29 * Revision 1.3 2007/04/25 19:39:42 kharlov
30 * Track extracpolation improved
32 * Revision 1.2 2007/04/01 19:16:52 kharlov
33 * D.P.: Produce EMCTrackSegments using TPC/ITS tracks (no CPV)
38 //_________________________________________________________________________
39 // Implementation version 2 of algorithm class to construct PHOS track segments
40 // Track segment for PHOS is list of
41 // EMC RecPoint + (possibly) projection of TPC track
42 // To find TrackSegments we do the following:
43 // for each EMC RecPoints we look at
44 // TPC projections radius fRtpc.
45 // If there is such a track
46 // we make "Link" it is just indexes of EMC and TPC track and distance
47 // between them in the PHOS plane.
48 // Then we sort "Links" and starting from the
49 // least "Link" pointing to the unassined EMC and TPC assing them to
51 // If there is no TPC track we make TrackSegment
52 // consisting from EMC alone. There is no TrackSegments without EMC RecPoint.
53 //// In principle this class should be called from AliPHOSReconstructor, but
54 // one can use it as well in standalone mode.
56 // root [0] AliPHOSTrackSegmentMakerv2 * t = new AliPHOSTrackSegmentMaker("galice.root", "tracksegmentsname", "recpointsname")
57 // Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
58 // // reads gAlice from header file "galice.root", uses recpoints stored in the branch names "recpointsname" (default = "Default")
59 // // and saves recpoints in branch named "tracksegmentsname" (default = "recpointsname")
60 // root [1] t->ExecuteTask()
61 // root [3] t->SetTrackSegmentsBranch("max distance 5 cm")
62 // root [4] t->ExecuteTask("deb all time")
64 //*-- Author: Dmitri Peressounko (RRC Ki & SUBATECH) & Yves Schutz (SUBATECH)
67 // --- ROOT system ---
70 #include "TBenchmark.h"
72 // --- Standard library ---
73 #include "Riostream.h"
74 // --- AliRoot header files ---
75 #include "AliPHOSGeometry.h"
76 #include "AliPHOSTrackSegmentMakerv2.h"
77 #include "AliPHOSTrackSegment.h"
78 #include "AliPHOSLink.h"
79 #include "AliPHOSEmcRecPoint.h"
80 #include "AliPHOSCpvRecPoint.h"
82 #include "AliESDEvent.h"
83 #include "AliESDtrack.h"
85 ClassImp( AliPHOSTrackSegmentMakerv2)
88 //____________________________________________________________________________
89 AliPHOSTrackSegmentMakerv2::AliPHOSTrackSegmentMakerv2() :
90 AliPHOSTrackSegmentMaker(),
103 // default ctor (to be used mainly by Streamer)
105 for(Int_t i=0; i<5; i++)fNtpcTracks[i]=0 ;
109 //____________________________________________________________________________
110 AliPHOSTrackSegmentMakerv2::AliPHOSTrackSegmentMakerv2(AliPHOSGeometry *geom) :
111 AliPHOSTrackSegmentMaker(geom),
112 fDefaultInit(kFALSE),
125 for(Int_t i=0; i<5; i++)fNtpcTracks[i]=0 ;
132 //____________________________________________________________________________
133 AliPHOSTrackSegmentMakerv2::AliPHOSTrackSegmentMakerv2(const AliPHOSTrackSegmentMakerv2 & tsm) :
134 AliPHOSTrackSegmentMaker(tsm),
135 fDefaultInit(kFALSE),
147 // cpy ctor: no implementation yet
148 // requested by the Coding Convention
149 Fatal("cpy ctor", "not implemented") ;
153 //____________________________________________________________________________
154 AliPHOSTrackSegmentMakerv2::~AliPHOSTrackSegmentMakerv2()
157 // fDefaultInit = kTRUE if TrackSegmentMaker created by default ctor (to get just the parameters)
159 delete fLinkUpArray ;
160 if (fTrackSegments) {
161 fTrackSegments->Delete();
162 delete fTrackSegments;
166 //____________________________________________________________________________
167 void AliPHOSTrackSegmentMakerv2::FillOneModule()
169 // Finds first and last indexes between which
170 // clusters from one PHOS module are
173 Int_t totalEmc = fEMCRecPoints->GetEntriesFast() ;
174 for(fEmcFirst = fEmcLast; (fEmcLast < totalEmc) &&
175 ((static_cast<AliPHOSRecPoint *>(fEMCRecPoints->At(fEmcLast)))->GetPHOSMod() == fModule );
180 //Do it ones, only first time
182 Int_t nTracks = fESD->GetNumberOfTracks();
184 Int_t nPHOSmod = fGeom->GetNModules() ;
185 if(fTPCtracks[0].size()<(UInt_t)nTracks){
186 for(Int_t i=0; i<nPHOSmod; i++)
187 fTPCtracks[i].resize(nTracks) ;
189 for(Int_t i=0; i<5; i++)fNtpcTracks[i]=0 ;
192 //In this particular case we use fixed vertex position at zero
193 Double_t vtx[3]={0.,0.,0.} ;
196 Double_t rEMC = fGeom->GetIPtoCrystalSurface() ; //Use here ideal geometry
197 for (Int_t iTrack=0; iTrack<nTracks; iTrack++) {
198 track = fESD->GetTrack(iTrack);
199 for(Int_t iTestMod=1; iTestMod<=nPHOSmod; iTestMod++){
200 Double_t modAngle=270.+fGeom->GetPHOSAngle(iTestMod) ;
201 modAngle*=TMath::Pi()/180. ;
202 track->Rotate(modAngle);
203 if (!track->GetXYZAt(rEMC, fESD->GetMagneticField(), xyz))
204 continue; //track coord on the cylinder of PHOS radius
205 if ((TMath::Abs(xyz[0])+TMath::Abs(xyz[1])+TMath::Abs(xyz[2]))<=0)
207 //Check if this track hits PHOS
208 inPHOS.SetXYZ(xyz[0],xyz[1],xyz[2]);
211 fGeom->ImpactOnEmc(vtx, inPHOS.Theta(), inPHOS.Phi(), modNum, z, x) ;
212 if(modNum==iTestMod){
213 //Mark this track as one belonging to module
214 TrackInPHOS_t &t = fTPCtracks[modNum-1][fNtpcTracks[modNum-1]++] ;
227 //____________________________________________________________________________
228 void AliPHOSTrackSegmentMakerv2::GetDistanceInPHOSPlane(AliPHOSEmcRecPoint * emcClu,
230 Float_t &dx, Float_t &dz) const
232 // Calculates the distance between the EMC RecPoint and the CPV RecPoint
233 // Clusters are sorted in "rows" and "columns" of width 1 cm
235 TVector3 emcGlobal; // Global position of the EMC recpoint
236 fGeom->GetGlobalPHOS((AliPHOSRecPoint*)emcClu,emcGlobal);
238 //Calculate actual distance to the PHOS surface
239 Double_t modAngle=270.+fGeom->GetPHOSAngle(emcClu->GetPHOSMod()) ;
240 modAngle*=TMath::Pi()/180. ;
241 Double_t rEMC = emcGlobal.X()*TMath::Cos(modAngle)+emcGlobal.Y()*TMath::Sin(modAngle) ;
242 track->Rotate(modAngle);
244 if(!track->GetXYZAt(rEMC, fESD->GetMagneticField(), xyz)){
247 return ; //track coord on the cylinder of PHOS radius
249 if((TMath::Abs(xyz[0])+TMath::Abs(xyz[1])+TMath::Abs(xyz[2]))<=0){
255 dx=(emcGlobal.X()-xyz[0])*TMath::Sin(modAngle)-(emcGlobal.Y()-xyz[1])*TMath::Cos(modAngle) ;
256 dx=TMath::Sign(dx,(Float_t)(emcGlobal.X()-xyz[0])) ; //set direction
257 dz=emcGlobal.Z()-xyz[2] ;
261 //____________________________________________________________________________
262 void AliPHOSTrackSegmentMakerv2::Init()
264 // Make all memory allocations that are not possible in default constructor
266 fLinkUpArray = new TClonesArray("AliPHOSLink", 1000);
267 fTrackSegments = new TClonesArray("AliPHOSTrackSegment",100);
270 //____________________________________________________________________________
271 void AliPHOSTrackSegmentMakerv2::InitParameters()
273 //Initializes parameters
282 //____________________________________________________________________________
283 void AliPHOSTrackSegmentMakerv2::MakeLinks()
285 // Finds distances (links) between all EMC and CPV clusters,
286 // which are not further apart from each other than fRcpv
287 // and sort them in accordance with this distance
289 fLinkUpArray->Clear() ;
291 AliPHOSEmcRecPoint * emcclu ;
296 for(iEmcRP = fEmcFirst; iEmcRP < fEmcLast; iEmcRP++ ) {
297 emcclu = static_cast<AliPHOSEmcRecPoint *>(fEMCRecPoints->At(iEmcRP)) ;
299 emcclu->GetLocalPosition(vecEmc) ;
300 Int_t mod=emcclu->GetPHOSMod() ;
301 for(Int_t itr=0; itr<fNtpcTracks[mod-1] ; itr++){
302 TrackInPHOS_t &t = fTPCtracks[mod-1][itr] ;
303 //calculate raw distance
304 Double_t rawdx = t.x - vecEmc.X() ;
305 Double_t rawdz = t.z - vecEmc.Z() ;
306 if(TMath::Sqrt(rawdx*rawdx+rawdz*rawdz)<fRtpc){
308 //calculate presize difference accounting misalignment
309 GetDistanceInPHOSPlane(emcclu, t.track, dx,dz) ;
310 Int_t itrack = t.track->GetID() ;
311 new ((*fLinkUpArray)[iLinkUp++]) AliPHOSLink(dx, dz, iEmcRP, itrack, -1) ;
315 fLinkUpArray->Sort() ; //first links with smallest distances
318 //____________________________________________________________________________
319 void AliPHOSTrackSegmentMakerv2::MakePairs()
321 // Using the previously made list of "links", we found the smallest link - i.e.
322 // link with the least distance between EMC and CPV and pointing to still
323 // unassigned RecParticles. We assign these RecPoints to TrackSegment and
324 // remove them from the list of "unassigned".
326 //Make arrays to mark clusters already chosen
327 Int_t * emcExist = 0;
329 if(fEmcLast > fEmcFirst)
330 emcExist = new Int_t[fEmcLast-fEmcFirst] ;
332 AliFatal(Form("fEmcLast > fEmcFirst: %d > %d is not true!",fEmcLast,fEmcFirst));
335 for(index = 0; index <fEmcLast-fEmcFirst; index ++)
336 emcExist[index] = 1 ;
339 Bool_t * tpcExist = 0;
340 Int_t nTracks = fESD->GetNumberOfTracks();
342 tpcExist = new Bool_t[nTracks] ;
344 for(index = 0; index <nTracks; index ++)
345 tpcExist[index] = 1 ;
348 // Finds the smallest links and makes pairs of CPV and EMC clusters with smallest distance
349 TIter nextUp(fLinkUpArray) ;
351 AliPHOSLink * linkUp ;
353 AliPHOSCpvRecPoint * nullpointer = 0 ;
355 while ( (linkUp = static_cast<AliPHOSLink *>(nextUp()) ) ){
357 if(emcExist[linkUp->GetEmc()-fEmcFirst] != -1){
359 if(tpcExist[linkUp->GetCpv()]){ //Track still exist
361 linkUp->GetXZ(dx,dz) ;
362 new ((* fTrackSegments)[fNTrackSegments])
363 AliPHOSTrackSegment(static_cast<AliPHOSEmcRecPoint *>(fEMCRecPoints->At(linkUp->GetEmc())) ,
365 linkUp->GetTrack(),dx,dz) ;
366 (static_cast<AliPHOSTrackSegment *>(fTrackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
368 emcExist[linkUp->GetEmc()-fEmcFirst] = -1 ; //Mark emc that Cpv was found
369 //mark track as already used
370 tpcExist[linkUp->GetCpv()] = kFALSE ;
371 } //if CpvUp still exist
375 //look through emc recPoints left without CPV
376 if(emcExist){ //if there is emc rec point
378 for(iEmcRP = 0; iEmcRP < fEmcLast-fEmcFirst ; iEmcRP++ ){
379 if(emcExist[iEmcRP] > 0 ){
380 new ((*fTrackSegments)[fNTrackSegments])
381 AliPHOSTrackSegment(static_cast<AliPHOSEmcRecPoint *>(fEMCRecPoints->At(iEmcRP+fEmcFirst)),
383 (static_cast<AliPHOSTrackSegment *>(fTrackSegments->At(fNTrackSegments)))->SetIndexInList(fNTrackSegments);
392 //____________________________________________________________________________
393 void AliPHOSTrackSegmentMakerv2::Clusters2TrackSegments(Option_t *option)
395 // Steering method to perform track segment construction for events
396 // in the range from fFirstEvent to fLastEvent.
397 // This range is optionally set by SetEventRange().
398 // if fLastEvent=-1 (by default), then process events until the end.
400 if(strstr(option,"tim"))
401 gBenchmark->Start("PHOSTSMaker");
403 if(strstr(option,"print")) {
408 //Make some initializations
409 fNTrackSegments = 0 ;
413 fTrackSegments->Clear();
415 // if(!ReadRecPoints(ievent)) continue; //reads RecPoints for event ievent
417 for(fModule = 1; fModule <= fGeom->GetNModules() ; fModule++ ) {
423 if(strstr(option,"deb"))
424 PrintTrackSegments(option);
426 if(strstr(option,"tim")){
427 gBenchmark->Stop("PHOSTSMaker");
428 Info("Exec", "took %f seconds for making TS",
429 gBenchmark->GetCpuTime("PHOSTSMaker"));
433 //____________________________________________________________________________
434 void AliPHOSTrackSegmentMakerv2::Print(const Option_t *)const
436 // Print TrackSegmentMaker parameters
438 TString message("") ;
439 if( strcmp(GetName(), "") != 0 ) {
440 message = "\n======== AliPHOSTrackSegmentMakerv2 ========\n" ;
441 message += "Making Track segments\n" ;
442 message += "with parameters:\n" ;
443 message += " Maximal EMC - TPC distance (cm) %f\n" ;
444 message += "============================================\n" ;
445 Info("Print", message.Data(),fRtpc) ;
448 Info("Print", "AliPHOSTrackSegmentMakerv2 not initialized ") ;
452 //____________________________________________________________________________
453 void AliPHOSTrackSegmentMakerv2::PrintTrackSegments(Option_t * option)
455 // option deb - prints # of found TrackSegments
456 // option deb all - prints as well indexed of found RecParticles assigned to the TS
458 Info("PrintTrackSegments", "Results from TrackSegmentMaker:") ;
459 printf(" Found %d TrackSegments\n", fTrackSegments->GetEntriesFast() );
461 if(strstr(option,"all")) { // printing found TS
462 printf("TrackSegment # EMC RP# CPV RP#\n") ;
464 for (index = 0 ; index <fTrackSegments->GetEntriesFast() ; index++) {
465 AliPHOSTrackSegment * ts = (AliPHOSTrackSegment * )fTrackSegments->At(index) ;
466 printf(" %d %d %d \n", ts->GetIndexInList(), ts->GetEmcIndex(), ts->GetTrackIndex() ) ;