/* $Id$ */
-////////////////////////////////////
-//
-// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
-//
-// This class contains as data:
-// * a pointer to the array of hits to be reconstructed (the event)
-// * a pointer to the array of segments made with these hits inside each station
-// * a pointer to the array of reconstructed tracks
-//
-// It contains as methods, among others:
-// * EventReconstruct to build the muon tracks
-// * EventReconstructTrigger to build the trigger tracks
-//
-////////////////////////////////////
-
-#include <stdlib.h>
-#include <Riostream.h>
-#include <TTree.h>
+//-----------------------------------------------------------------------------
+/// \class AliMUONVTrackReconstructor
+/// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
+///
+/// This class contains as data:
+/// * a pointer to the array of hits to be reconstructed (the event)
+/// * a pointer to the array of reconstructed tracks
+///
+/// It contains as methods, among others:
+/// * EventReconstruct to build the muon tracks
+/// * EventReconstructTrigger to build the trigger tracks
+///
+/// Several options and adjustable parameters are available for both Kalman and Original
+/// tracking algorithms (hard coded for the moment in AliMUONVTrackReconstructor.cxx):
+/// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be
+/// attached to the track candidate and to select good tracks.
+/// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates
+/// are made assuming linear propagation between stations 4 and 5.
+/// - *fgkTrackAllTracks* : according to the value of this flag, in case that several
+/// new clusters pass the quality cut, either we consider all the possibilities
+/// (duplicating tracks) or we attach only the best cluster.
+/// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks
+/// lost during the tracking by removing the worst of the 2 clusters attached in the
+/// previous station.
+/// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality
+/// of the tracks at the end of the tracking by removing clusters that do not pass
+/// new quality cut (within the limit that we must keep at least one cluster per
+/// the station).
+/// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the
+/// quality of the tracks.
+///
+/// \author Philippe Pillot
+//-----------------------------------------------------------------------------
#include "AliMUONVTrackReconstructor.h"
-#include "AliMUONData.h"
+
#include "AliMUONConstants.h"
+#include "AliMUONRawCluster.h"
#include "AliMUONHitForRec.h"
+#include "AliMUONObjectPair.h"
#include "AliMUONTriggerTrack.h"
#include "AliMUONTriggerCircuit.h"
#include "AliMUONLocalTrigger.h"
#include "AliMUONGlobalTrigger.h"
-#include "AliMUONSegment.h"
#include "AliMUONTrack.h"
#include "AliMUONTrackParam.h"
#include "AliMUONTrackExtrap.h"
-#include "AliMagF.h"
+#include "AliMUONTrackHitPattern.h"
+#include "AliMUONVTrackStore.h"
+#include "AliMUONVClusterStore.h"
+#include "AliMUONRawCluster.h"
+#include "AliMUONVTriggerStore.h"
+#include "AliMUONVTriggerTrackStore.h"
+#include "AliMpDEManager.h"
+
#include "AliLog.h"
#include "AliTracker.h"
+#include <TClonesArray.h>
+#include <TMath.h>
+#include <TMatrixD.h>
+
+#include <Riostream.h>
+
+/// \cond CLASSIMP
ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
+/// \endcond
+
//************* Defaults parameters for reconstruction
const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
-const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingResolution = 0.01;
-const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingResolution = 0.144;
-const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxSigma2Distance = 16.0;
-// Simple magnetic field:
-// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
-// Length and Position from reco_muon.F, with opposite sign:
-// Length = ZMAGEND-ZCOIL
-// Position = (ZMAGEND+ZCOIL)/2
-// to be ajusted differently from real magnetic field ????
-const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBValue = 7.0;
-const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBLength = 428.0;
-const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBPosition = 1019.0;
-
-//__________________________________________________________________________
-AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONData* data)
+const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxNormChi2MatchTrigger = 16.0;
+const Double_t AliMUONVTrackReconstructor::fgkMaxTrackingDistanceBending = 2.;
+const Double_t AliMUONVTrackReconstructor::fgkMaxTrackingDistanceNonBending = 2.;
+
+const Double_t AliMUONVTrackReconstructor::fgkSigmaToCutForTracking = 6.0;
+const Bool_t AliMUONVTrackReconstructor::fgkMakeTrackCandidatesFast = kFALSE;
+const Bool_t AliMUONVTrackReconstructor::fgkTrackAllTracks = kTRUE;
+const Bool_t AliMUONVTrackReconstructor::fgkRecoverTracks = kTRUE;
+const Bool_t AliMUONVTrackReconstructor::fgkImproveTracks = kTRUE;
+const Double_t AliMUONVTrackReconstructor::fgkSigmaToCutForImprovement = 4.0;
+
+
+ //__________________________________________________________________________
+AliMUONVTrackReconstructor::AliMUONVTrackReconstructor()
: TObject(),
fMinBendingMomentum(fgkDefaultMinBendingMomentum),
fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
- fBendingResolution(fgkDefaultBendingResolution),
- fNonBendingResolution(fgkDefaultNonBendingResolution),
- fMaxSigma2Distance(fgkDefaultMaxSigma2Distance),
- fChamberThicknessInX0(AliMUONConstants::DefaultChamberThicknessInX0()),
- fSimpleBValue(fgkDefaultSimpleBValue),
- fSimpleBLength(fgkDefaultSimpleBLength),
- fSimpleBPosition(fgkDefaultSimpleBPosition),
- fSegmentMaxDistBending(0x0),
- fSegmentMaxDistNonBending(0x0),
+ fMaxNormChi2MatchTrigger(fgkDefaultMaxNormChi2MatchTrigger),
fHitsForRecPtr(0x0),
fNHitsForRec(0),
fNHitsForRecPerChamber(0x0),
fIndexOfFirstHitForRecPerChamber(0x0),
- fSegmentsPtr(0x0),
- fNSegments(0x0),
fRecTracksPtr(0x0),
- fNRecTracks(0),
- fMUONData(data),
- fTriggerTrack(new AliMUONTriggerTrack()),
- fTriggerCircuit(0x0)
+ fNRecTracks(0)
{
/// Constructor for class AliMUONVTrackReconstructor
- fSegmentMaxDistBending = new Double_t[AliMUONConstants::NTrackingSt()];
- fSegmentMaxDistNonBending = new Double_t[AliMUONConstants::NTrackingSt()];
fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
- SetReconstructionParametersToDefaults();
-
// Memory allocation for the TClonesArray of hits for reconstruction
// Is 10000 the right size ????
fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
-
- // Memory allocation for the TClonesArray's of segments in stations
- // Is 2000 the right size ????
- fSegmentsPtr = new TClonesArray*[AliMUONConstants::NTrackingSt()];
- fNSegments = new Int_t[AliMUONConstants::NTrackingSt()];
- for (Int_t st = 0; st < AliMUONConstants::NTrackingSt(); st++) {
- fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
- fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
- }
-
- const AliMagF* kField = AliTracker::GetFieldMap();
- if (!kField) AliFatal("No field available");
- // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
- Float_t b[3], x[3];
- x[0] = 50.; x[1] = 50.; x[2] = -950.;
- kField->Field(x,b);
-
- fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
- fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
- // See how to get fSimple(BValue, BLength, BPosition)
- // automatically calculated from the actual magnetic field ????
+
+ // Memory allocation for the TClonesArray of reconstructed tracks
+ fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
// set the magnetic field for track extrapolations
+ const AliMagF* kField = AliTracker::GetFieldMap();
+ if (!kField) AliFatal("No field available");
AliMUONTrackExtrap::SetField(kField);
}
//__________________________________________________________________________
-AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor(void)
+AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
{
/// Destructor for class AliMUONVTrackReconstructor
- delete [] fSegmentMaxDistBending;
- delete [] fSegmentMaxDistNonBending;
delete [] fNHitsForRecPerChamber;
delete [] fIndexOfFirstHitForRecPerChamber;
- delete fTriggerTrack;
delete fHitsForRecPtr;
- // Correct destruction of everything ????
- for (Int_t st = 0; st < AliMUONConstants::NTrackingSt(); st++) delete fSegmentsPtr[st];
- delete [] fSegmentsPtr;
- delete [] fNSegments;
-}
-
- //__________________________________________________________________________
-void AliMUONVTrackReconstructor::SetReconstructionParametersToDefaults(void)
-{
- /// Set reconstruction parameters for making segments to default values
- // Would be much more convenient with a structure (or class) ????
-
- // ******** Parameters for making segments
- // should be parametrized ????
- // according to interval between chambers in a station ????
- // Maximum distance in non bending plane
- // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
- // SIGCUT*DYMAX(IZ)
- for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++)
- fSegmentMaxDistNonBending[st] = 5. * 0.22;
- // Maximum distance in bending plane:
- // values from TRACKF_STAT, corresponding to (J psi 20cm),
- // scaled to the real distance between chambers in a station
- fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
- (AliMUONConstants::DefaultChamberZ(1) - AliMUONConstants::DefaultChamberZ(0)) / 20.0);
- fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
- (AliMUONConstants::DefaultChamberZ(3) - AliMUONConstants::DefaultChamberZ(2)) / 20.0);
- fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
- (AliMUONConstants::DefaultChamberZ(5) - AliMUONConstants::DefaultChamberZ(4)) / 20.0);
- fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
- (AliMUONConstants::DefaultChamberZ(7) - AliMUONConstants::DefaultChamberZ(6)) / 20.0);
- fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
- (AliMUONConstants::DefaultChamberZ(9) - AliMUONConstants::DefaultChamberZ(8)) / 20.0);
-
- return;
+ delete fRecTracksPtr;
}
//__________________________________________________________________________
-void AliMUONVTrackReconstructor::EventReconstruct(void)
+void AliMUONVTrackReconstructor::ResetHitsForRec()
{
- // To reconstruct one event
- AliDebug(1,"Enter EventReconstruct");
- ResetTracks(); //AZ
- ResetSegments(); //AZ
- ResetHitsForRec(); //AZ
- AddHitsForRecFromRawClusters();
- MakeSegments();
- MakeTracks();
- if (fMUONData->IsTriggerTrackBranchesInTree())
- ValidateTracksWithTrigger();
-
- // Add tracks to MUON data container
- for(Int_t i=0; i<fNRecTracks; i++) {
- AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
- fMUONData->AddRecTrack(*track);
+ /// To reset the TClonesArray of HitsForRec,
+ /// and the number of HitForRec and the index of the first HitForRec per chamber
+ if (fHitsForRecPtr) fHitsForRecPtr->Clear("C");
+ fNHitsForRec = 0;
+ for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
+ fNHitsForRecPerChamber[ch] = 0;
+ fIndexOfFirstHitForRecPerChamber[ch] = 0;
}
}
//__________________________________________________________________________
-void AliMUONVTrackReconstructor::ResetTracks(void)
+void AliMUONVTrackReconstructor::ResetTracks()
{
/// To reset the TClonesArray of reconstructed tracks
- if (fRecTracksPtr) fRecTracksPtr->Delete();
- // Delete in order that the Track destructors are called,
- // hence the space for the TClonesArray of pointers to TrackHit's is freed
+ if (fRecTracksPtr) fRecTracksPtr->Clear("C");
fNRecTracks = 0;
return;
}
//__________________________________________________________________________
-void AliMUONVTrackReconstructor::ResetSegments(void)
+void AliMUONVTrackReconstructor::EventReconstruct(const AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
{
- /// To reset the TClonesArray of segments and the number of Segments for all stations
- for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) {
- if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
- fNSegments[st] = 0;
+ /// To reconstruct one event
+ AliDebug(1,"");
+
+ ResetTracks();
+ ResetHitsForRec();
+ AddHitsForRecFromRawClusters(clusterStore);
+ MakeTracks();
+
+ // Add tracks to MUON data container
+ for (Int_t i=0; i<fNRecTracks; ++i)
+ {
+ AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
+ trackStore.Add(*track);
}
- return;
}
//__________________________________________________________________________
-void AliMUONVTrackReconstructor::ResetHitsForRec(void)
+void AliMUONVTrackReconstructor::AddHitsForRecFromRawClusters(const AliMUONVClusterStore& clusterStore)
{
- /// To reset the array and the number of HitsForRec,
- /// and also the number of HitsForRec
- /// and the index of the first HitForRec per chamber
- if (fHitsForRecPtr) fHitsForRecPtr->Delete();
- fNHitsForRec = 0;
- for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
- fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
- return;
+ /// Build internal array of hit for rec from clusterStore
+
+ TIter next(clusterStore.CreateIterator());
+ AliMUONRawCluster* clus(0x0);
+ Int_t iclus(0);
+
+ while ( ( clus = static_cast<AliMUONRawCluster*>(next()) ) )
+ {
+ // new AliMUONHitForRec from raw cluster
+ // and increment number of AliMUONHitForRec's (total and in chamber)
+ AliMUONHitForRec* hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
+ fNHitsForRec++;
+ // more information into HitForRec
+ hitForRec->SetBendingReso2(clus->GetErrY() * clus->GetErrY());
+ hitForRec->SetNonBendingReso2(clus->GetErrX() * clus->GetErrX());
+ // original raw cluster
+ Int_t ch = AliMpDEManager::GetChamberId(clus->GetDetElemId());
+ hitForRec->SetChamberNumber(ch);
+ hitForRec->SetHitNumber(iclus);
+ // Z coordinate of the raw cluster (cm)
+ hitForRec->SetZ(clus->GetZ(0));
+ if (AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 3) {
+ cout << "Chamber " << ch <<" raw cluster " << iclus << " : " << endl;
+ clus->Print("full");
+ cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
+ hitForRec->Print("full");
+ }
+ ++iclus;
+ } // end of chamber loop
+
+ SortHitsForRecWithIncreasingChamber();
+
+ AliDebug(1,"End of AddHitsForRecFromRawClusters");
+
+ if (AliLog::GetGlobalDebugLevel() > 0)
+ {
+ AliDebug(1, Form("NHitsForRec: %d",fNHitsForRec));
+ for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
+ {
+ AliDebug(1, Form("Chamber(0...): %d",ch));
+ AliDebug(1, Form("NHitsForRec: %d", fNHitsForRecPerChamber[ch]));
+ AliDebug(1, Form("Index(first HitForRec): %d", fIndexOfFirstHitForRecPerChamber[ch]));
+ for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
+ hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
+ hit++) {
+ AliDebug(1, Form("HitForRec index(0...): %d",hit));
+ ((*fHitsForRecPtr)[hit])->Dump();
+ }
+ }
+ }
}
//__________________________________________________________________________
}
//__________________________________________________________________________
-void AliMUONVTrackReconstructor::MakeSegmentsPerStation(Int_t Station)
+void AliMUONVTrackReconstructor::MakeTracks()
+{
+ /// To make the tracks from the list of segments and points in all stations
+ AliDebug(1,"Enter MakeTracks");
+ // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
+ MakeTrackCandidates();
+ if (fRecTracksPtr->GetEntriesFast() == 0) return;
+ // Follow tracks in stations(1..) 3, 2 and 1
+ FollowTracks();
+ // Improve the reconstructed tracks
+ if (fgkImproveTracks) ImproveTracks();
+ // Remove double tracks
+ RemoveDoubleTracks();
+ // Fill AliMUONTrack data members
+ Finalize();
+}
+
+ //__________________________________________________________________________
+TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsInStation(Int_t station)
{
- /// To make the list of segments in station number "Station" (0...)
- /// from the list of hits to be reconstructed.
- /// Updates "fNSegments"[Station].
- /// Segments in stations 4 and 5 are sorted
- /// according to increasing absolute value of "impact parameter"
+ /// To make the list of segments in station(0..) "Station" from the list of hits to be reconstructed.
+ /// Return a new TClonesArray of segments.
+ /// It is the responsibility of the user to delete it afterward.
+ AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",station));
+
AliMUONHitForRec *hit1Ptr, *hit2Ptr;
- AliMUONSegment *segment;
- Bool_t last2st;
- Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
- impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
- AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",Station));
- // first and second chambers (0...) in the station
- Int_t ch1 = 2 * Station;
+ AliMUONObjectPair *segment;
+ Double_t bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
+ // first and second chambers (0...) in the station
+ Int_t ch1 = 2 * station;
Int_t ch2 = ch1 + 1;
- // variable true for stations downstream of the dipole:
- // Station(0..4) equal to 3 or 4
- if ((Station == 3) || (Station == 4)) {
- last2st = kTRUE;
- // maximum impact parameter (cm) according to fMinBendingMomentum...
- maxImpactParam =
- TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
- // minimum impact parameter (cm) according to fMaxBendingMomentum...
- minImpactParam =
- TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
- }
- else last2st = kFALSE;
- // extrapolation factor from Z of first chamber to Z of second chamber
- // dZ to be changed to take into account fine structure of chambers ????
- Double_t extrapFact;
- // index for current segment
- Int_t segmentIndex = 0;
- // Loop over HitsForRec in the first chamber of the station
+
+ // list of segments
+ TClonesArray *segments = new TClonesArray("AliMUONObjectPair", fNHitsForRecPerChamber[ch2]);
+ segments->SetOwner(kTRUE);
+
+ // Loop over HitForRec's in the first chamber of the station
for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
- hit1++) {
+ hit1++)
+ {
// pointer to the HitForRec
hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
- // extrapolation,
- // on the straight line joining the HitForRec to the vertex (0,0,0),
- // to the Z of the second chamber of the station
- // Loop over HitsForRec in the second chamber of the station
+ // Loop over HitsForRec's in the second chamber of the station
for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
- hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
- hit2++) {
+ hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
+ hit2++)
+ {
// pointer to the HitForRec
hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
- // absolute values of distances, in bending and non bending planes,
- // between the HitForRec in the second chamber
- // and the previous extrapolation
- extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ();
- extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
- extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
- distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
- distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
- if (last2st) {
- // bending slope
- if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0.0 ) {
- bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
- (hit1Ptr->GetZ() - hit2Ptr->GetZ());
- // absolute value of impact parameter
- impactParam =
- TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
- }
- else {
- AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): impactParam set to maxImpactParam");
- impactParam = maxImpactParam;
- }
- }
- // check for distances not too large,
- // and impact parameter not too big if stations downstream of the dipole.
- // Conditions "distBend" and "impactParam" correlated for these stations ????
- if ((distBend < fSegmentMaxDistBending[Station]) &&
- (distNonBend < fSegmentMaxDistNonBending[Station]) &&
- (!last2st || (impactParam < maxImpactParam)) &&
- (!last2st || (impactParam > minImpactParam))) {
- // make new segment
- segment = new ((*fSegmentsPtr[Station])[segmentIndex])
- AliMUONSegment(hit1Ptr, hit2Ptr);
- // update "link" to this segment from the hit in the first chamber
- if (hit1Ptr->GetNSegments() == 0)
- hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
- hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
- if (AliLog::GetGlobalDebugLevel() > 1) {
- cout << "segmentIndex(0...): " << segmentIndex
- << " distBend: " << distBend
- << " distNonBend: " << distNonBend
- << endl;
- segment->Dump();
- cout << "HitForRec in first chamber" << endl;
- hit1Ptr->Dump();
- cout << "HitForRec in second chamber" << endl;
- hit2Ptr->Dump();
- };
- // increment index for current segment
- segmentIndex++;
+ if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0. )
+ {
+ // bending slope
+ bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / (hit1Ptr->GetZ() - hit2Ptr->GetZ());
+ // impact parameter
+ impactParam = hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope;
+ // absolute value of bending momentum
+ bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
+ } else
+ {
+ AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): no segment created");
+ continue;
+ }
+ // check for bending momentum within tolerances
+ if ((bendingMomentum < fMaxBendingMomentum) && (bendingMomentum > fMinBendingMomentum))
+ {
+ // make new segment
+ segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(hit1Ptr, hit2Ptr, kFALSE, kFALSE);
+ if (AliLog::GetGlobalDebugLevel() > 1) {
+ cout << "segmentIndex(0...): " << segments->GetLast() << endl;
+ segment->Dump();
+ cout << "HitForRec in first chamber" << endl;
+ hit1Ptr->Dump();
+ cout << "HitForRec in second chamber" << endl;
+ hit2Ptr->Dump();
+ }
}
} //for (Int_t hit2
} // for (Int_t hit1...
- fNSegments[Station] = segmentIndex;
- // Sorting according to "impact parameter" if station(1..5) 4 or 5,
- // i.e. Station(0..4) 3 or 4, using the function "Compare".
- // After this sorting, it is impossible to use
- // the "fNSegments" and "fIndexOfFirstSegment"
- // of the HitForRec in the first chamber to explore all segments formed with it.
- // Is this sorting really needed ????
- if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
- AliDebug(1,Form("Station: %d NSegments: %d ", Station, fNSegments[Station]));
+ AliDebug(1,Form("Station: %d NSegments: %d ", station, segments->GetEntriesFast()));
+ return segments;
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
+{
+ /// To remove identical tracks:
+ /// Tracks are considered identical if they have all their hits in common.
+ /// One keeps the track with the larger number of hits if need be
+ AliMUONTrack *track1, *track2, *trackToRemove;
+ Int_t hitsInCommon, nHits1, nHits2;
+ Bool_t removedTrack1;
+ // Loop over first track of the pair
+ track1 = (AliMUONTrack*) fRecTracksPtr->First();
+ while (track1) {
+ removedTrack1 = kFALSE;
+ nHits1 = track1->GetNTrackHits();
+ // Loop over second track of the pair
+ track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
+ while (track2) {
+ nHits2 = track2->GetNTrackHits();
+ // number of hits in common between two tracks
+ hitsInCommon = track1->HitsInCommon(track2);
+ // check for identical tracks
+ if ((hitsInCommon == nHits1) || (hitsInCommon == nHits2)) {
+ // decide which track to remove
+ if (nHits2 > nHits1) {
+ // remove track1 and continue the first loop with the track next to track1
+ trackToRemove = track1;
+ track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
+ fRecTracksPtr->Remove(trackToRemove);
+ fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
+ fNRecTracks--;
+ removedTrack1 = kTRUE;
+ break;
+ } else {
+ // remove track2 and continue the second loop with the track next to track2
+ trackToRemove = track2;
+ track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
+ fRecTracksPtr->Remove(trackToRemove);
+ fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
+ fNRecTracks--;
+ }
+ } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
+ } // track2
+ if (removedTrack1) continue;
+ track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
+ } // track1
+ return;
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::RemoveDoubleTracks()
+{
+ /// To remove double tracks:
+ /// Tracks are considered identical if more than half of the hits of the track
+ /// which has the smaller number of hits are in common with the other track.
+ /// Among two identical tracks, one keeps the track with the larger number of hits
+ /// or, if these numbers are equal, the track with the minimum chi2.
+ AliMUONTrack *track1, *track2, *trackToRemove;
+ Int_t hitsInCommon, nHits1, nHits2;
+ Bool_t removedTrack1;
+ // Loop over first track of the pair
+ track1 = (AliMUONTrack*) fRecTracksPtr->First();
+ while (track1) {
+ removedTrack1 = kFALSE;
+ nHits1 = track1->GetNTrackHits();
+ // Loop over second track of the pair
+ track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
+ while (track2) {
+ nHits2 = track2->GetNTrackHits();
+ // number of hits in common between two tracks
+ hitsInCommon = track1->HitsInCommon(track2);
+ // check for identical tracks
+ if (((nHits1 < nHits2) && (2 * hitsInCommon > nHits1)) || (2 * hitsInCommon > nHits2)) {
+ // decide which track to remove
+ if ((nHits1 > nHits2) || ((nHits1 == nHits2) && (track1->GetFitFMin() <= track2->GetFitFMin()))) {
+ // remove track2 and continue the second loop with the track next to track2
+ trackToRemove = track2;
+ track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
+ fRecTracksPtr->Remove(trackToRemove);
+ fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
+ fNRecTracks--;
+ } else {
+ // else remove track1 and continue the first loop with the track next to track1
+ trackToRemove = track1;
+ track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
+ fRecTracksPtr->Remove(trackToRemove);
+ fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
+ fNRecTracks--;
+ removedTrack1 = kTRUE;
+ break;
+ }
+ } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
+ } // track2
+ if (removedTrack1) continue;
+ track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
+ } // track1
return;
}
//__________________________________________________________________________
-Double_t AliMUONVTrackReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
+Double_t AliMUONVTrackReconstructor::TryOneHitForRec(const AliMUONTrackParam &trackParam, AliMUONHitForRec* hitForRec,
+ AliMUONTrackParam &trackParamAtHit, Bool_t updatePropagator)
{
- /// Returns impact parameter at vertex in bending plane (cm),
- /// from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
- /// using simple values for dipole magnetic field.
- /// The sign of "BendingMomentum" is the sign of the charge.
- return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
- BendingMomentum);
+/// Test the compatibility between the track and the hitForRec (using trackParam's covariance matrix):
+/// return the corresponding Chi2
+/// return trackParamAtHit
+
+ // extrapolate track parameters and covariances at the z position of the tested hit
+ trackParamAtHit = trackParam;
+ AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtHit, hitForRec->GetZ(), updatePropagator);
+
+ // set pointer to hit into trackParamAtHit
+ trackParamAtHit.SetHitForRecPtr(hitForRec);
+
+ // Set differences between trackParam and hitForRec in the bending and non bending directions
+ Double_t dX = hitForRec->GetNonBendingCoor() - trackParamAtHit.GetNonBendingCoor();
+ Double_t dY = hitForRec->GetBendingCoor() - trackParamAtHit.GetBendingCoor();
+
+ // Calculate errors and covariances
+ const TMatrixD& kParamCov = trackParamAtHit.GetCovariances();
+ Double_t sigma2X = kParamCov(0,0) + hitForRec->GetNonBendingReso2();
+ Double_t sigma2Y = kParamCov(2,2) + hitForRec->GetBendingReso2();
+
+ // Compute chi2
+ return dX * dX / sigma2X + dY * dY / sigma2Y;
+
}
//__________________________________________________________________________
-Double_t AliMUONVTrackReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
+Bool_t AliMUONVTrackReconstructor::TryOneHitForRecFast(const AliMUONTrackParam &trackParam, AliMUONHitForRec* hitForRec)
{
- /// Returns signed bending momentum in bending plane (GeV/c),
- /// the sign being the sign of the charge for particles moving forward in Z,
- /// from the impact parameter "ImpactParam" at vertex in bending plane (cm),
- /// using simple values for dipole magnetic field.
- return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
- ImpactParam);
+/// Test the compatibility between the track and the hitForRec within a wide fix window
+/// assuming linear propagation of the track:
+/// return kTRUE if they are compatibles
+
+ Double_t dZ = hitForRec->GetZ() - trackParam.GetZ();
+ Double_t dX = hitForRec->GetNonBendingCoor() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
+ Double_t dY = hitForRec->GetBendingCoor() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
+
+ if (TMath::Abs(dX) > fgkMaxTrackingDistanceNonBending || TMath::Abs(dY) > fgkMaxTrackingDistanceBending) return kFALSE;
+
+ return kTRUE;
+
}
//__________________________________________________________________________
-void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(void)
+Double_t AliMUONVTrackReconstructor::TryTwoHitForRecFast(const AliMUONTrackParam &trackParamAtHit1, AliMUONHitForRec* hitForRec2,
+ AliMUONTrackParam &trackParamAtHit2)
{
- /// Try to match track from tracking system with trigger track
- AliMUONTrack *track;
- AliMUONTrackParam trackParam;
- AliMUONTriggerTrack *triggerTrack;
+/// Test the compatibility between the track and the 2 hitForRec together (using trackParam's covariance matrix)
+/// assuming linear propagation between the two hits:
+/// return the corresponding Chi2 accounting for covariances between the 2 hitForRec
+/// return trackParamAtHit1 & 2
- fMUONData->SetTreeAddress("RL");
- fMUONData->GetRecTriggerTracks();
- TClonesArray *recTriggerTracks = fMUONData->RecTriggerTracks();
+ // extrapolate linearly track parameters at the z position of the second hit
+ trackParamAtHit2 = trackParamAtHit1;
+ AliMUONTrackExtrap::LinearExtrapToZ(&trackParamAtHit2, hitForRec2->GetZ());
- Bool_t matchTrigger;
- Double_t distSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
+ // set pointer to hit2 into trackParamAtHit2
+ trackParamAtHit2.SetHitForRecPtr(hitForRec2);
+
+ // Set differences between track and hitForRec in the bending and non bending directions
+ AliMUONHitForRec* hitForRec1 = trackParamAtHit1.GetHitForRecPtr();
+ Double_t dX1 = hitForRec1->GetNonBendingCoor() - trackParamAtHit1.GetNonBendingCoor();
+ Double_t dX2 = hitForRec2->GetNonBendingCoor() - trackParamAtHit2.GetNonBendingCoor();
+ Double_t dY1 = hitForRec1->GetBendingCoor() - trackParamAtHit1.GetBendingCoor();
+ Double_t dY2 = hitForRec2->GetBendingCoor() - trackParamAtHit2.GetBendingCoor();
+
+ // Calculate errors and covariances
+ const TMatrixD& kParamCov1 = trackParamAtHit1.GetCovariances();
+ const TMatrixD& kParamCov2 = trackParamAtHit2.GetCovariances();
+ Double_t dZ = trackParamAtHit2.GetZ() - trackParamAtHit1.GetZ();
+ Double_t sigma2X1 = kParamCov1(0,0) + hitForRec1->GetNonBendingReso2();
+ Double_t sigma2X2 = kParamCov2(0,0) + hitForRec2->GetNonBendingReso2();
+ Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
+ Double_t sigma2Y1 = kParamCov1(2,2) + hitForRec1->GetBendingReso2();
+ Double_t sigma2Y2 = kParamCov2(2,2) + hitForRec2->GetBendingReso2();
+ Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
+
+ // Compute chi2
+ Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
+ Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
+ if (detX == 0. || detY == 0.) return 1.e10;
+ return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
+ + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
+
+}
+
+ //__________________________________________________________________________
+Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, Int_t nextStation)
+{
+ /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible HitForRec(s)
+ /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
+ /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
+ /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
+ /// Remove the obsolete "trackCandidate" at the end.
+ /// kFALSE: add only the best hit(s) to the "trackCandidate". Try to add a couple of hits in priority.
+ /// return kTRUE if new hits have been found (otherwise return kFALSE)
+ AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
+
+ // Order the chamber according to the propagation direction (tracking starts with chamber 2):
+ // - nextStation == station(1...) 5 => forward propagation
+ // - nextStation < station(1...) 5 => backward propagation
+ Int_t ch1, ch2;
+ if (nextStation==4) {
+ ch1 = 2*nextStation+1;
+ ch2 = 2*nextStation;
+ } else {
+ ch1 = 2*nextStation;
+ ch2 = 2*nextStation+1;
+ }
+
+ Double_t chi2WithOneHitForRec = 1.e10;
+ Double_t chi2WithTwoHitForRec = 1.e10;
+ Double_t maxChi2WithOneHitForRec = 2. * fgkSigmaToCutForTracking * fgkSigmaToCutForTracking; // 2 because 2 quantities in chi2
+ Double_t maxChi2WithTwoHitForRec = 4. * fgkSigmaToCutForTracking * fgkSigmaToCutForTracking; // 4 because 4 quantities in chi2
+ Double_t bestChi2WithOneHitForRec = maxChi2WithOneHitForRec;
+ Double_t bestChi2WithTwoHitForRec = maxChi2WithTwoHitForRec;
+ Bool_t foundOneHit = kFALSE;
+ Bool_t foundTwoHits = kFALSE;
+ AliMUONTrack *newTrack = 0x0;
+ AliMUONHitForRec *hitForRecCh1, *hitForRecCh2;
+ AliMUONTrackParam extrapTrackParamAtHit1;
+ AliMUONTrackParam extrapTrackParamAtHit2;
+ AliMUONTrackParam bestTrackParamAtHit1;
+ AliMUONTrackParam bestTrackParamAtHit2;
+ Bool_t *hitForRecCh1Used = new Bool_t[fNHitsForRecPerChamber[ch1]];
+ for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) hitForRecCh1Used[hit1] = kFALSE;
+
+ // Get track parameters
+ AliMUONTrackParam trackParam(*(AliMUONTrackParam*)trackCandidate.GetTrackParamAtHit()->First());
+
+ // Add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: look for hits in chamber(1..): " << ch2+1 << endl;
+ }
+
+ // look for candidates in chamber 2
+ for (Int_t hit2 = 0; hit2 < fNHitsForRecPerChamber[ch2]; hit2++) {
+
+ hitForRecCh2 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch2]+hit2);
+
+ // try to add the current hit fast
+ if (!TryOneHitForRecFast(trackParam, hitForRecCh2)) continue;
+
+ // try to add the current hit accuratly
+ extrapTrackParamAtHit2 = trackParam;
+ AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtHit2, hitForRecCh2->GetZ());
+ chi2WithOneHitForRec = TryOneHitForRec(extrapTrackParamAtHit2, hitForRecCh2, extrapTrackParamAtHit2);
+
+ // if good chi2 then try to attach a hitForRec in the other chamber too
+ if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) {
+ Bool_t foundSecondHit = kFALSE;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: found one hit in chamber(1..): " << ch2+1
+ << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl;
+ cout << " look for second hits in chamber(1..): " << ch1+1 << " ..." << endl;
+ }
+
+ // add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtHit2,AliMUONConstants::ChamberThicknessInX0(),1.);
+
+ for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) {
+
+ hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1);
+
+ // try to add the current hit fast
+ if (!TryOneHitForRecFast(extrapTrackParamAtHit2, hitForRecCh1)) continue;
+
+ // try to add the current hit in addition to the one found on the previous chamber
+ chi2WithTwoHitForRec = TryTwoHitForRecFast(extrapTrackParamAtHit2, hitForRecCh1, extrapTrackParamAtHit1);
+
+ // if good chi2 then consider to add the 2 hitForRec to the "trackCandidate"
+ if (chi2WithTwoHitForRec < maxChi2WithTwoHitForRec) {
+ foundSecondHit = kTRUE;
+ foundTwoHits = kTRUE;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: found one hit in chamber(1..): " << ch1+1
+ << " (Chi2 = " << chi2WithTwoHitForRec << ")" << endl;
+ }
+
+ if (fgkTrackAllTracks) {
+ // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's
+ newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
+ extrapTrackParamAtHit1.SetRemovable(kTRUE);
+ newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit1,hitForRecCh1);
+ extrapTrackParamAtHit2.SetRemovable(kTRUE);
+ newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit2,hitForRecCh2);
+ newTrack->GetTrackParamAtHit()->Sort();
+ fNRecTracks++;
+
+ // Tag hitForRecCh1 as used
+ hitForRecCh1Used[hit1] = kTRUE;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: added two hits in station(1..): " << nextStation+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else if (chi2WithTwoHitForRec < bestChi2WithTwoHitForRec) {
+ // keep track of the best couple of hits
+ bestChi2WithTwoHitForRec = chi2WithTwoHitForRec;
+ bestTrackParamAtHit1 = extrapTrackParamAtHit1;
+ bestTrackParamAtHit2 = extrapTrackParamAtHit2;
+ }
+
+ }
+
+ }
+
+ // if no hitForRecCh1 found then consider to add hitForRecCh2 only
+ if (!foundSecondHit) {
+ foundOneHit = kTRUE;
+
+ if (fgkTrackAllTracks) {
+ // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's
+ newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
+ extrapTrackParamAtHit2.SetRemovable(kFALSE);
+ newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit2,hitForRecCh2);
+ newTrack->GetTrackParamAtHit()->Sort();
+ fNRecTracks++;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: added one hit in chamber(1..): " << ch2+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else if (!foundTwoHits && chi2WithOneHitForRec < bestChi2WithOneHitForRec) {
+ // keep track of the best single hitForRec except if a couple of hits has already been found
+ bestChi2WithOneHitForRec = chi2WithOneHitForRec;
+ bestTrackParamAtHit1 = extrapTrackParamAtHit2;
+ }
+
+ }
+
+ }
+
+ }
+
+ // look for candidates in chamber 1 not already attached to a track
+ // if we want to keep all possible tracks or if no good couple of hitForRec has been found
+ if (fgkTrackAllTracks || !foundTwoHits) {
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: look for single hits in chamber(1..): " << ch1+1 << endl;
+ }
+
+ //Extrapolate trackCandidate to chamber "ch2"
+ AliMUONTrackExtrap::LinearExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
+
+ // add MCS effect for next step
+ AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
+
+ for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) {
+
+ hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1);
+
+ if (hitForRecCh1Used[hit1]) continue; // Skip hitForRec already used
+
+ // try to add the current hit fast
+ if (!TryOneHitForRecFast(trackParam, hitForRecCh1)) continue;
+
+ // try to add the current hit accuratly
+ extrapTrackParamAtHit1 = trackParam;
+ AliMUONTrackExtrap::LinearExtrapToZ(&extrapTrackParamAtHit1, hitForRecCh1->GetZ());
+ chi2WithOneHitForRec = TryOneHitForRec(extrapTrackParamAtHit1, hitForRecCh1, extrapTrackParamAtHit1);
+
+ // if good chi2 then consider to add hitForRecCh1
+ // We do not try to attach a hitForRec in the other chamber too since it has already been done above
+ if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) {
+ foundOneHit = kTRUE;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: found one hit in chamber(1..): " << ch1+1
+ << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl;
+ }
+
+ if (fgkTrackAllTracks) {
+ // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new hitForRec's
+ newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
+ extrapTrackParamAtHit1.SetRemovable(kFALSE);
+ newTrack->AddTrackParamAtHit(&extrapTrackParamAtHit1,hitForRecCh1);
+ newTrack->GetTrackParamAtHit()->Sort();
+ fNRecTracks++;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: added one hit in chamber(1..): " << ch1+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else if (chi2WithOneHitForRec < bestChi2WithOneHitForRec) {
+ // keep track of the best single hitForRec except if a couple of hits has already been found
+ bestChi2WithOneHitForRec = chi2WithOneHitForRec;
+ bestTrackParamAtHit1 = extrapTrackParamAtHit1;
+ }
+
+ }
+
+ }
+
+ }
+
+ // fill out the best track if required else clean up the fRecTracksPtr array
+ if (!fgkTrackAllTracks) {
+ if (foundTwoHits) {
+ bestTrackParamAtHit1.SetRemovable(kTRUE);
+ trackCandidate.AddTrackParamAtHit(&bestTrackParamAtHit1,bestTrackParamAtHit1.GetHitForRecPtr());
+ bestTrackParamAtHit2.SetRemovable(kTRUE);
+ trackCandidate.AddTrackParamAtHit(&bestTrackParamAtHit2,bestTrackParamAtHit2.GetHitForRecPtr());
+ trackCandidate.GetTrackParamAtHit()->Sort();
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: added the two best hits in station(1..): " << nextStation+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else if (foundOneHit) {
+ bestTrackParamAtHit1.SetRemovable(kFALSE);
+ trackCandidate.AddTrackParamAtHit(&bestTrackParamAtHit1,bestTrackParamAtHit1.GetHitForRecPtr());
+ trackCandidate.GetTrackParamAtHit()->Sort();
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowLinearTrackInStation: added the best hit in chamber(1..): " << bestTrackParamAtHit1.GetHitForRecPtr()->GetChamberNumber()+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else return kFALSE;
+
+ } else if (foundOneHit || foundTwoHits) {
+
+ // remove obsolete track
+ fRecTracksPtr->Remove(&trackCandidate);
+ fNRecTracks--;
+
+ } else return kFALSE;
+
+ return kTRUE;
+
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
+ const AliMUONVTriggerTrackStore& triggerTrackStore,
+ const AliMUONVTriggerStore& triggerStore,
+ const AliMUONTrackHitPattern& trackHitPattern)
+{
+ /// Try to match track from tracking system with trigger track
+ static const Double_t kDistSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
+
+ Int_t matchTrigger;
+ Int_t loTrgNum(-1);
Double_t distTriggerTrack[3];
- Double_t chi2MatchTrigger, xTrack, yTrack, ySlopeTrack, dTrigTrackMin2, dTrigTrack2 = 0.;
+ Double_t xTrack, yTrack, ySlopeTrack, chi2MatchTrigger, minChi2MatchTrigger, chi2;
+
+ TIter itTrack(trackStore.CreateIterator());
+ AliMUONTrack* track;
- track = (AliMUONTrack*) fRecTracksPtr->First();
- while (track) {
- matchTrigger = kFALSE;
+ while ( ( track = static_cast<AliMUONTrack*>(itTrack()) ) )
+ {
+ matchTrigger = 0;
chi2MatchTrigger = 0.;
+ loTrgNum = -1;
+ Int_t doubleMatch=-1; // Check if track matches 2 trigger tracks
+ Double_t doubleChi2 = -1.;
- trackParam = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last()));
+ AliMUONTrackParam trackParam(*((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last())));
AliMUONTrackExtrap::ExtrapToZ(&trackParam, AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
xTrack = trackParam.GetNonBendingCoor();
yTrack = trackParam.GetBendingCoor();
ySlopeTrack = trackParam.GetBendingSlope();
- dTrigTrackMin2 = 999.;
-
- triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->First();
- while(triggerTrack){
- distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/distSigma[0];
- distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/distSigma[1];
- distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/distSigma[2];
- dTrigTrack2 = 0.;
- for (Int_t iVar = 0; iVar < 3; iVar++) dTrigTrack2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
- if (dTrigTrack2 < dTrigTrackMin2 && dTrigTrack2 < fMaxSigma2Distance) {
- dTrigTrackMin2 = dTrigTrack2;
- matchTrigger = kTRUE;
- chi2MatchTrigger = dTrigTrack2/3.; // Normalized Chi2, 3 variables (X,Y,slopeY)
+ minChi2MatchTrigger = 999.;
+
+ AliMUONTriggerTrack *triggerTrack;
+ TIter itTriggerTrack(triggerTrackStore.CreateIterator());
+ while ( ( triggerTrack = static_cast<AliMUONTriggerTrack*>(itTriggerTrack() ) ) )
+ {
+ distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/kDistSigma[0];
+ distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/kDistSigma[1];
+ distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/kDistSigma[2];
+ chi2 = 0.;
+ for (Int_t iVar = 0; iVar < 3; iVar++) chi2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
+ chi2 /= 3.; // Normalized Chi2: 3 degrees of freedom (X,Y,slopeY)
+ if (chi2 < fMaxNormChi2MatchTrigger)
+ {
+ Bool_t isDoubleTrack = (TMath::Abs(chi2 - minChi2MatchTrigger)<1.);
+ if (chi2 < minChi2MatchTrigger && chi2 < fMaxNormChi2MatchTrigger)
+ {
+ if(isDoubleTrack)
+ {
+ doubleMatch = loTrgNum;
+ doubleChi2 = chi2MatchTrigger;
+ }
+ minChi2MatchTrigger = chi2;
+ chi2MatchTrigger = chi2;
+ loTrgNum = triggerTrack->GetLoTrgNum();
+ AliMUONLocalTrigger* locTrg = triggerStore.FindLocal(loTrgNum);
+ matchTrigger=1;
+ if(locTrg->LoLpt()>0)matchTrigger=2;
+ if(locTrg->LoHpt()>0)matchTrigger=3;
+ }
+ else if(isDoubleTrack)
+ {
+ doubleMatch = triggerTrack->GetLoTrgNum();
+ doubleChi2 = chi2;
+ }
+ }
+ }
+ if(doubleMatch>=0)
+ { // If two trigger tracks match, select the one passing more trigger cuts
+ AliDebug(1, Form("Two candidates found: %i and %i",loTrgNum,doubleMatch));
+ AliMUONLocalTrigger* locTrg1 = triggerStore.FindLocal(doubleMatch);
+ if((locTrg1->LoLpt()>0 && matchTrigger<2) || (locTrg1->LoHpt() && matchTrigger<3))
+ {
+ if(locTrg1->LoHpt()>0)matchTrigger=3;
+ else matchTrigger=2;
+ loTrgNum = doubleMatch;
+ chi2MatchTrigger=doubleChi2;
}
- triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->After(triggerTrack);
}
track->SetMatchTrigger(matchTrigger);
+ track->SetLoTrgNum(loTrgNum);
track->SetChi2MatchTrigger(chi2MatchTrigger);
- track = (AliMUONTrack*) fRecTracksPtr->After(track);
- }
-
- return;
-}
-
-//__________________________________________________________________________
-void AliMUONVTrackReconstructor::EventReconstructTrigger(void)
-{
- /// To reconstruct trigger for one event
- AliDebug(1,"Enter EventReconstructTrigger");
- MakeTriggerTracks();
- return;
+ AliMUONLocalTrigger* locTrg = static_cast<AliMUONLocalTrigger*>(triggerStore.FindLocal(loTrgNum));
+
+ if (locTrg)
+ {
+ track->SetLocalTrigger(locTrg->LoCircuit(),
+ locTrg->LoStripX(),
+ locTrg->LoStripY(),
+ locTrg->LoDev(),
+ locTrg->LoLpt(),
+ locTrg->LoHpt());
+ }
+ }
+
+ trackHitPattern.GetHitPattern(trackStore,triggerStore);
}
//__________________________________________________________________________
-Bool_t AliMUONVTrackReconstructor::MakeTriggerTracks(void)
+void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
+ const AliMUONVTriggerStore& triggerStore,
+ AliMUONVTriggerTrackStore& triggerTrackStore)
{
- // To make the trigger tracks from Local Trigger
- AliDebug(1, "Enter MakeTriggerTracks");
-
- TTree* treeR;
- Int_t nTRentries;
- UChar_t gloTrigPat;
- TClonesArray *localTrigger;
- TClonesArray *globalTrigger;
- AliMUONLocalTrigger *locTrg;
- AliMUONGlobalTrigger *gloTrg;
-
- treeR = fMUONData->TreeR();
- if (!treeR) {
- AliWarning("TreeR is not loaded");
- return kFALSE;
- }
+ /// To make the trigger tracks from Local Trigger
+ AliDebug(1, "");
+
+ AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
- nTRentries = Int_t(treeR->GetEntries());
-
- treeR->GetEvent(0); // only one entry
+ UChar_t gloTrigPat = 0;
- if (!(fMUONData->IsTriggerBranchesInTree())) {
- AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries));
- return kFALSE;
+ if (globalTrigger)
+ {
+ gloTrigPat = globalTrigger->GetGlobalResponse();
}
-
- fMUONData->SetTreeAddress("TC");
- fMUONData->GetTrigger();
-
- // global trigger for trigger pattern
- gloTrigPat = 0;
- globalTrigger = fMUONData->GlobalTrigger();
- gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
-
- if (gloTrg)
- gloTrigPat = gloTrg->GetGlobalResponse();
-
-
- // local trigger for tracking
- localTrigger = fMUONData->LocalTrigger();
- Int_t nlocals = (Int_t) (localTrigger->GetEntries());
+
+ TIter next(triggerStore.CreateIterator());
+ AliMUONLocalTrigger* locTrg(0x0);
Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
-
- Float_t y11 = 0.;
- Int_t stripX21 = 0;
- Float_t y21 = 0.;
- Float_t x11 = 0.;
-
- for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
- locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
-
- AliDebug(1, "AliMUONTrackReconstructor::MakeTriggerTrack using NEW trigger \n");
- AliMUONTriggerCircuit* circuit =
- (AliMUONTriggerCircuit*)fTriggerCircuit->At(locTrg->LoCircuit()-1); // -1 !!!
-
- y11 = circuit->GetY11Pos(locTrg->LoStripX());
- stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
- y21 = circuit->GetY21Pos(stripX21);
- x11 = circuit->GetX11Pos(locTrg->LoStripY());
-
- AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %d %f %f %f \n",i,locTrg->LoCircuit(),
- locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
+
+ AliMUONTriggerTrack triggerTrack;
+
+ while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
+ {
+ Bool_t xTrig=kFALSE;
+ Bool_t yTrig=kFALSE;
- Float_t thetax = TMath::ATan2( x11 , z11 );
- Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
+ Int_t localBoardId = locTrg->LoCircuit();
+ if ( locTrg->LoSdev()==1 && locTrg->LoDev()==0 &&
+ locTrg->LoStripX()==0) xTrig=kFALSE; // no trigger in X
+ else xTrig=kTRUE; // trigger in X
+ if (locTrg->LoTrigY()==1 &&
+ locTrg->LoStripY()==15 ) yTrig = kFALSE; // no trigger in Y
+ else yTrig = kTRUE; // trigger in Y
- fTriggerTrack->SetX11(x11);
- fTriggerTrack->SetY11(y11);
- fTriggerTrack->SetThetax(thetax);
- fTriggerTrack->SetThetay(thetay);
- fTriggerTrack->SetGTPattern(gloTrigPat);
-
- fMUONData->AddRecTriggerTrack(*fTriggerTrack);
+ if (xTrig && yTrig)
+ { // make Trigger Track if trigger in X and Y
+
+ Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
+ // need first to convert deviation to [0-30]
+ // (see AliMUONLocalTriggerBoard::LocalTrigger)
+ Int_t deviation = locTrg->LoDev();
+ Int_t sign = 0;
+ if ( !locTrg->LoSdev() && deviation ) sign=-1;
+ if ( !locTrg->LoSdev() && !deviation ) sign= 0;
+ if ( locTrg->LoSdev() == 1 ) sign=+1;
+ deviation *= sign;
+ deviation += 15;
+ Int_t stripX21 = locTrg->LoStripX()+deviation+1;
+ Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
+ Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
+
+ AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %f %f %f \n",locTrg->LoCircuit(),
+ locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
+
+ Float_t thetax = TMath::ATan2( x11 , z11 );
+ Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
+
+ triggerTrack.SetX11(x11);
+ triggerTrack.SetY11(y11);
+ triggerTrack.SetThetax(thetax);
+ triggerTrack.SetThetay(thetay);
+ triggerTrack.SetGTPattern(gloTrigPat);
+ triggerTrack.SetLoTrgNum(localBoardId);
+
+ triggerTrackStore.Add(triggerTrack);
+ } // board is fired
} // end of loop on Local Trigger
-
- return kTRUE;
-}
-
-//__________________________________________________________________________
-void AliMUONVTrackReconstructor::EventDumpTrigger(void)
-{
- /// Dump reconstructed trigger event
- /// and the particle parameters
- AliMUONTriggerTrack *triggertrack ;
- Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
-
- AliDebug(1, "****** enter EventDumpTrigger ******");
- AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks));
-
- // Loop over reconstructed tracks
- for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
- triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
- printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
- trackIndex,
- triggertrack->GetX11(),triggertrack->GetY11(),
- triggertrack->GetThetax(),triggertrack->GetThetay());
- }
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff