/// - MakeTracks to build the tracks
///
-#include <stdlib.h>
-#include <Riostream.h>
-#include <TMatrixD.h>
-
-#include "AliMUONVTrackReconstructor.h"
#include "AliMUONTrackReconstructor.h"
-#include "AliMUONData.h"
+#include "AliMUONRecData.h"
#include "AliMUONConstants.h"
#include "AliMUONRawCluster.h"
#include "AliMUONHitForRec.h"
-#include "AliMUONSegment.h"
+#include "AliMUONObjectPair.h"
#include "AliMUONTrack.h"
#include "AliMUONTrackParam.h"
#include "AliMUONTrackExtrap.h"
+
#include "AliLog.h"
-#include <TVirtualFitter.h>
+
+#include <TMinuit.h>
+#include <Riostream.h>
+#include <TMatrixD.h>
// Functions to be minimized with Minuit
void TrackChi2(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag);
void TrackChi2MCS(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag);
-void mnvertLocal(Double_t* a, Int_t l, Int_t m, Int_t n, Int_t& ifail);
-
Double_t MultipleScatteringAngle2(AliMUONTrackParam *param);
/// \cond CLASSIMP
/// \endcond
//************* Defaults parameters for reconstruction
-const Double_t AliMUONTrackReconstructor::fgkDefaultMaxChi2 = 100.0;
-
-TVirtualFitter* AliMUONTrackReconstructor::fgFitter = 0x0;
+const Double_t AliMUONTrackReconstructor::fgkMaxNormChi2 = 100.0;
+const Bool_t AliMUONTrackReconstructor::fgkTrackAllTracks = kFALSE;
//__________________________________________________________________________
-AliMUONTrackReconstructor::AliMUONTrackReconstructor(AliMUONData* data)
- : AliMUONVTrackReconstructor(data),
- fMaxChi2(fgkDefaultMaxChi2)
+AliMUONTrackReconstructor::AliMUONTrackReconstructor(AliMUONRecData* data)
+ : AliMUONVTrackReconstructor(data)
{
/// Constructor for class AliMUONTrackReconstructor
void AliMUONTrackReconstructor::AddHitsForRecFromRawClusters()
{
/// To add to the list of hits for reconstruction all the raw clusters
- TTree *TR = fMUONData->TreeR();
+ TTree *treeR;
AliMUONHitForRec *hitForRec;
AliMUONRawCluster *clus;
- Int_t iclus, nclus, nTRentries;
+ Int_t iclus, nclus;
TClonesArray *rawclusters;
AliDebug(1,"Enter AddHitsForRecFromRawClusters");
- fMUONData->SetTreeAddress("RC");
- nTRentries = Int_t(TR->GetEntries());
- if (nTRentries != 1) {
- AliError(Form("nTRentries = %d not equal to 1 ",nTRentries));
+ treeR = fMUONData->TreeR();
+ if (!treeR) {
+ AliError("TreeR must be loaded");
exit(0);
}
+
+ fMUONData->SetTreeAddress("RC");
fMUONData->GetRawClusters(); // only one entry
// Loop over tracking chambers
for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
- // number of HitsForRec to 0 for the chamber
- fNHitsForRecPerChamber[ch] = 0;
- // index of first HitForRec for the chamber
- if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
- else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
rawclusters =fMUONData->RawClusters(ch);
nclus = (Int_t) (rawclusters->GetEntries());
// Loop over (cathode correlated) raw clusters
// and increment number of AliMUONHitForRec's (total and in chamber)
hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
fNHitsForRec++;
- (fNHitsForRecPerChamber[ch])++;
// more information into HitForRec
hitForRec->SetBendingReso2(clus->GetErrY() * clus->GetErrY());
hitForRec->SetNonBendingReso2(clus->GetErrX() * clus->GetErrX());
hitForRec->SetHitNumber(iclus);
// Z coordinate of the raw cluster (cm)
hitForRec->SetZ(clus->GetZ(0));
-
- StdoutToAliDebug(3,
- cout << "Chamber " << ch <<
- " raw cluster " << iclus << " : " << endl;
- clus->Print("full");
- cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
- hitForRec->Print("full");
- );
+ 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");
+ }
} // end of cluster loop
} // end of chamber loop
SortHitsForRecWithIncreasingChamber();
return;
}
- //__________________________________________________________________________
-void AliMUONTrackReconstructor::MakeSegments(void)
-{
- /// To make the list of segments in all stations,
- /// from the list of hits to be reconstructed
- AliDebug(1,"Enter MakeSegments");
- // Loop over stations
- for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) MakeSegmentsPerStation(st);
-
- StdoutToAliDebug(3,
- cout << "end of MakeSegments" << endl;
- for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++)
- {
- cout << "station " << st
- << " has " << fNSegments[st] << " segments:"
- << endl;
- for (Int_t seg = 0; seg < fNSegments[st]; seg++)
- {
- ((*fSegmentsPtr[st])[seg])->Print();
- }
- }
- );
- return;
-}
-
//__________________________________________________________________________
void AliMUONTrackReconstructor::MakeTracks(void)
{
FollowTracks();
// Remove double tracks
RemoveDoubleTracks();
- UpdateHitForRecAtHit();
+ // Fill out the AliMUONTrack's
+ FillMUONTrack();
}
//__________________________________________________________________________
void AliMUONTrackReconstructor::MakeTrackCandidates(void)
{
- /// To make track candidates
- /// with at least 3 aligned points in stations(1..) 4 and 5
- /// (two Segment's or one Segment and one HitForRec)
- Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
- AliMUONSegment *begSegment;
+ /// To make track candidates:
+ /// Start with segments station(1..) 4 or 5 then follow track in station 5 or 4.
+ /// Good candidates are made of at least three hitForRec's.
+ /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks.
+ TClonesArray *segments;
+ AliMUONObjectPair *segment;
+ AliMUONHitForRec *hitForRec1, *hitForRec2;
+ AliMUONTrack *track;
+ AliMUONTrackParam *trackParamAtFirstHit;
+ Int_t iCandidate = 0;
+
AliDebug(1,"Enter MakeTrackCandidates");
- // Loop over stations(1..) 5 and 4 for the beginning segment
- for (begStation = 4; begStation > 2; begStation--) {
- // Loop over segments in the beginning station
- for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
- // pointer to segment
- begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
- AliDebug(2,Form("Look for TrackCandidate's with Segment %d in Station(0..) %d", iBegSegment, begStation));
- // Look for track candidates with two segments,
- // "begSegment" and all compatible segments in other station.
- // Only for beginning station(1..) 5
- // because candidates with 2 segments have to looked for only once.
- if (begStation == 4)
- nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
- // Look for track candidates with one segment and one point,
- // "begSegment" and all compatible HitForRec's in other station.
- // Only if "begSegment" does not belong already to a track candidate.
- // Is that a too strong condition ????
- if (!(begSegment->GetInTrack()))
- nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
- } // for (iBegSegment = 0;...
- } // for (begStation = 4;...
- return;
-}
- //__________________________________________________________________________
-Int_t AliMUONTrackReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
-{
- /// To make track candidates with two segments in stations(1..) 4 and 5,
- /// the first segment being pointed to by "BegSegment".
- /// Returns the number of such track candidates.
- Int_t endStation, iEndSegment, nbCan2Seg;
- AliMUONSegment *endSegment;
- AliMUONSegment *extrapSegment = NULL;
- AliMUONTrack *recTrack;
- Double_t mcsFactor;
- AliDebug(1,"Enter MakeTrackCandidatesWithTwoSegments");
- // Station for the end segment
- endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
- // multiple scattering factor corresponding to one chamber
- mcsFactor = 0.0136 /
- GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
- mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
- // linear extrapolation to end station
- // number of candidates with 2 segments to 0
- nbCan2Seg = 0;
- // Loop over segments in the end station
- for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
- // pointer to segment
- endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
- // test compatibility between current segment and "extrapSegment"
- // 4 because 4 quantities in chi2
- extrapSegment =
- BegSegment->CreateSegmentFromLinearExtrapToStation(endSegment->GetZ(), mcsFactor);
- if ((endSegment->
- NormalizedChi2WithSegment(extrapSegment,
- fMaxSigma2Distance)) <= 4.0) {
- // both segments compatible:
- // make track candidate from "begSegment" and "endSegment"
- AliDebug(2,Form("TrackCandidate with Segment %d in Station(0..) %d", iEndSegment, endStation));
- // flag for both segments in one track:
- // to be done in track constructor ????
- BegSegment->SetInTrack(kTRUE);
- endSegment->SetInTrack(kTRUE);
- recTrack = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrack(BegSegment, endSegment);
- // Set track parameters at vertex from last stations 4 & 5
- CalcTrackParamAtVertex(recTrack);
+ // Loop over stations(1..) 5 and 4 and make track candidates
+ for (Int_t istat=4; istat>=3; istat--) {
+ // Make segments in the station
+ segments = MakeSegmentsInStation(istat);
+ // Loop over segments
+ for (Int_t iseg=0; iseg<segments->GetEntriesFast(); iseg++) {
+ AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate));
+ // Transform segments to tracks and put them at the end of fRecTracksPtr
+ segment = (AliMUONObjectPair*) ((*segments)[iseg]);
+ hitForRec1 = (AliMUONHitForRec*) segment->First();
+ hitForRec2 = (AliMUONHitForRec*) segment->Second();
+ track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(hitForRec1, hitForRec2);
fNRecTracks++;
- if (AliLog::GetGlobalDebugLevel() > 1) recTrack->RecursiveDump();
- // increment number of track candidates with 2 segments
- nbCan2Seg++;
+ // Add MCS effects in parameter covariances
+ trackParamAtFirstHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First());
+ AliMUONTrackExtrap::AddMCSEffect(trackParamAtFirstHit,AliMUONConstants::ChamberThicknessInX0(),1.);
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameter covariances at first hit with multiple Coulomb scattering effects:"<<endl;
+ trackParamAtFirstHit->GetCovariances()->Print();
+ }
+ // Look for compatible hitForRec(s) in the other station
+ FollowTrackInStation(track,7-istat);
}
- delete extrapSegment; // should not delete HitForRec's it points to !!!!
- } // for (iEndSegment = 0;...
- return nbCan2Seg;
+ // delete the array of segments
+ delete segments;
+ }
+ fRecTracksPtr->Compress(); // this is essential before checking tracks
+
+ // Keep all different tracks or only the best ones as required
+ if (fgkTrackAllTracks) RemoveIdenticalTracks();
+ else RemoveDoubleTracks();
+
+ AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
+
}
//__________________________________________________________________________
-Int_t AliMUONTrackReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
+void AliMUONTrackReconstructor::RemoveIdenticalTracks(void)
{
- /// To make track candidates with one segment and one point
- /// in stations(1..) 4 and 5,
- /// the segment being pointed to by "BegSegment".
- Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
- AliMUONHitForRec *extrapHitForRec= NULL;
- AliMUONHitForRec *hit;
- AliMUONTrack *recTrack;
- Double_t mcsFactor;
- AliDebug(1,"Enter MakeTrackCandidatesWithOneSegmentAndOnePoint");
- // station for the end point
- endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
- // multiple scattering factor corresponding to one chamber
- mcsFactor = 0.0136 /
- GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
- mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
- // first and second chambers(0..) in the end station
- ch1 = 2 * endStation;
- ch2 = ch1 + 1;
- // number of candidates to 0
- nbCan1Seg1Hit = 0;
- // Loop over chambers of the end station
- for (ch = ch2; ch >= ch1; ch--) {
- // limits for the hit index in the loop
- iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
- iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
- // Loop over HitForRec's in the chamber
- for (iHit = iHitMin; iHit < iHitMax; iHit++) {
- // pointer to HitForRec
- hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
- // test compatibility between current HitForRec and "extrapHitForRec"
- // 2 because 2 quantities in chi2
- // linear extrapolation to chamber
- extrapHitForRec =
- BegSegment->CreateHitForRecFromLinearExtrapToChamber( hit->GetZ(), mcsFactor);
- if ((hit->
- NormalizedChi2WithHitForRec(extrapHitForRec,
- fMaxSigma2Distance)) <= 2.0) {
- // both HitForRec's compatible:
- // make track candidate from begSegment and current HitForRec
- AliDebug(2, Form("TrackCandidate with HitForRec %d in Chamber(0..) %d", iHit, ch));
- // flag for beginning segments in one track:
- // to be done in track constructor ????
- BegSegment->SetInTrack(kTRUE);
- recTrack = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrack(BegSegment, hit);
- // Set track parameters at vertex from last stations 4 & 5
- CalcTrackParamAtVertex(recTrack);
- // the right place to eliminate "double counting" ???? how ????
- fNRecTracks++;
- if (AliLog::GetGlobalDebugLevel() > 1) recTrack->RecursiveDump();
- // increment number of track candidates
- nbCan1Seg1Hit++;
- }
- delete extrapHitForRec;
- } // for (iHit = iHitMin;...
- } // for (ch = ch2;...
- return nbCan1Seg1Hit;
+ /// 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 AliMUONTrackReconstructor::CalcTrackParamAtVertex(AliMUONTrack *Track) const
+void AliMUONTrackReconstructor::RemoveDoubleTracks(void)
{
- /// Set track parameters at vertex.
- /// TrackHit's are assumed to be only in stations(1..) 4 and 5,
- /// and sorted according to increasing Z.
- /// Parameters are calculated from information in HitForRec's
- /// of first and last TrackHit's.
- AliMUONTrackParam *trackParamVertex = Track->GetTrackParamAtVertex(); // pointer to track parameters at vertex
- // Pointer to HitForRec attached to first TrackParamAtHit
- AliMUONHitForRec *firstHit = ((AliMUONTrackParam*) (Track->GetTrackParamAtHit()->First()))->GetHitForRecPtr();
- // Pointer to HitForRec attached to last TrackParamAtHit
- AliMUONHitForRec *lastHit = ((AliMUONTrackParam*) (Track->GetTrackParamAtHit()->Last()))->GetHitForRecPtr();
- // Z difference between first and last hits
- Double_t deltaZ = firstHit->GetZ() - lastHit->GetZ();
- // bending slope in stations(1..) 4 and 5
- Double_t bendingSlope = (firstHit->GetBendingCoor() - lastHit->GetBendingCoor()) / deltaZ;
- trackParamVertex->SetBendingSlope(bendingSlope);
- // impact parameter
- Double_t impactParam = firstHit->GetBendingCoor() - bendingSlope * firstHit->GetZ();
- // signed bending momentum
- trackParamVertex->SetInverseBendingMomentum(1.0 / GetBendingMomentumFromImpactParam(impactParam));
- // bending slope at vertex
- trackParamVertex->SetBendingSlope(bendingSlope + impactParam / fSimpleBPosition);
- // non bending slope
- trackParamVertex->SetNonBendingSlope((firstHit->GetNonBendingCoor() - lastHit->GetNonBendingCoor()) / deltaZ);
- // vertex coordinates at (0,0,0)
- trackParamVertex->SetZ(0.0);
- trackParamVertex->SetBendingCoor(0.0);
- trackParamVertex->SetNonBendingCoor(0.0);
+ /// 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;
}
//__________________________________________________________________________
void AliMUONTrackReconstructor::FollowTracks(void)
{
/// Follow tracks in stations(1..) 3, 2 and 1
- // too long: should be made more modular !!!!
- AliMUONHitForRec *bestHit, *extrapHit, *hit;
- AliMUONSegment *bestSegment, *extrapSegment, *segment;
+ AliDebug(1,"Enter FollowTracks");
+
AliMUONTrack *track, *nextTrack;
- AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
- // -1 to avoid compilation warnings
- Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
- Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
- Double_t bendingMomentum, chi2Norm = 0.;
-
-
- // local maxSigma2Distance, for easy increase in testing
- maxSigma2Distance = fMaxSigma2Distance;
- AliDebug(2,"Enter FollowTracks");
- // Loop over track candidates
+ AliMUONTrackParam *trackParamAtFirstHit;
+ Double_t numberOfDegFree, chi2Norm;
+ Int_t currentNRecTracks;
+
+ for (Int_t station = 2; station >= 0; station--) {
+ // Save the actual number of reconstructed track in case of
+ // tracks are added or suppressed during the tracking procedure
+ // !! Do not compress fRecTracksPtr until the end of the loop over tracks !!
+ currentNRecTracks = fNRecTracks;
+ for (Int_t iRecTrack = 0; iRecTrack <currentNRecTracks; iRecTrack++) {
+ AliDebug(1,Form("FollowTracks: track candidate(1..) %d", iRecTrack+1));
+ track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
+ // Fit the track:
+ // Do not take into account the multiple scattering to speed up the fit
+ // Calculate the track parameter covariance matrix
+ // If "station" is station(1..) 3 then use the vertex to better constrain the fit
+ if (station==2) {
+ SetVertexForFit(track);
+ track->SetFitWithVertex(kTRUE);
+ } else track->SetFitWithVertex(kFALSE);
+ Fit(track,kFALSE, kTRUE);
+ // Remove the track if the normalized chi2 is too high
+ numberOfDegFree = (2. * track->GetNTrackHits() - 5.);
+ if (numberOfDegFree > 0) chi2Norm = track->GetFitFMin() / numberOfDegFree;
+ else chi2Norm = 1.e10;
+ if (chi2Norm > fgkMaxNormChi2) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ continue;
+ }
+ // Add MCS effects in parameter covariances
+ trackParamAtFirstHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First());
+ AliMUONTrackExtrap::AddMCSEffect(trackParamAtFirstHit,AliMUONConstants::ChamberThicknessInX0(),1.);
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameter covariances at first hit with multiple Coulomb scattering effects:"<<endl;
+ trackParamAtFirstHit->GetCovariances()->Print();
+ }
+ // Look for compatible hitForRec in station(0..) "station"
+ FollowTrackInStation(track,station);
+ }
+ // Compress fRecTracksPtr for the next step
+ fRecTracksPtr->Compress();
+ // Keep only the best tracks if required
+ if (!fgkTrackAllTracks) RemoveDoubleTracks();
+ }
+
+ // Last fit of track candidates with all station
+ // Take into account the multiple scattering and remove bad tracks
+ Int_t trackIndex = -1;
track = (AliMUONTrack*) fRecTracksPtr->First();
- trackIndex = -1;
while (track) {
trackIndex++;
nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
- AliDebug(2,Form("FollowTracks: track candidate(0..): %d", trackIndex));
- // Fit track candidate from parameters at vertex
- // -> with 3 parameters (X_vertex and Y_vertex are fixed)
- // without multiple Coulomb scattering
- Fit(track,0,0);
- if (AliLog::GetGlobalDebugLevel()> 2) {
- cout << "FollowTracks: track candidate(0..): " << trackIndex
- << " after fit in stations(0..) 3 and 4" << endl;
+ track->SetFitWithVertex(kFALSE); // just to be sure
+ Fit(track,kTRUE, kTRUE);
+ // Printout for debuging
+ if (AliLog::GetGlobalDebugLevel() >= 3) {
+ cout << "FollowTracks: track candidate(0..) " << trackIndex << " after final fit" << endl;
track->RecursiveDump();
+ }
+ // Remove the track if the normalized chi2 is too high
+ numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
+ if (numberOfDegFree > 0) chi2Norm = track->GetFitFMin() / numberOfDegFree;
+ else chi2Norm = 1.e10;
+ if (chi2Norm > fgkMaxNormChi2) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
}
- // Loop over stations(1..) 3, 2 and 1
- // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
- // otherwise: majority coincidence 2 !!!!
- for (station = 2; station >= 0; station--) {
- // Track parameters at first track hit (smallest Z)
- trackParam1 = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First());
- // extrapolation to station
- AliMUONTrackExtrap::ExtrapToStation(trackParam1, station, trackParam);
- extrapSegment = new AliMUONSegment(); // empty segment
- // multiple scattering factor corresponding to one chamber
- // and momentum in bending plane (not total)
- mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
- mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
- // Z difference from previous station
- dZ1 = AliMUONConstants::DefaultChamberZ(2 * station) -
- AliMUONConstants::DefaultChamberZ(2 * station + 2);
- // Z difference between the two previous stations
- dZ2 = AliMUONConstants::DefaultChamberZ(2 * station + 2) -
- AliMUONConstants::DefaultChamberZ(2 * station + 4);
- // Z difference between the two chambers in the previous station
- dZ3 = AliMUONConstants::DefaultChamberZ(2 * station) -
- AliMUONConstants::DefaultChamberZ(2 * station + 1);
- extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
- extrapSegment->SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
- extrapSegment->UpdateFromStationTrackParam(trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
- trackParam1->GetInverseBendingMomentum());
- bestChi2 = 5.0;
- bestSegment = NULL;
- if (AliLog::GetGlobalDebugLevel() > 2) {
- cout << "FollowTracks: track candidate(0..): " << trackIndex
- << " Look for segment in station(0..): " << station << endl;
- }
+ track = nextTrack;
+ }
+ fRecTracksPtr->Compress();
+
+}
- // Loop over segments in station
- for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
- // Look for best compatible Segment in station
- // should consider all possibilities ????
- // multiple scattering ????
- // separation in 2 functions: Segment and HitForRec ????
- segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
- // correction of corrected segment (fBendingCoor and fNonBendingCoor)
- // according to real Z value of "segment" and slopes of "extrapSegment"
- AliMUONTrackExtrap::ExtrapToZ(&(trackParam[0]), segment->GetZ());
- AliMUONTrackExtrap::ExtrapToZ(&(trackParam[1]), segment->GetZ()); // now same as trackParam[0] !?!?!?!?!?!
- extrapSegment->SetBendingCoor((&(trackParam[0]))->GetBendingCoor());
- extrapSegment->SetNonBendingCoor((&(trackParam[0]))->GetNonBendingCoor());
- extrapSegment->SetBendingSlope((&(trackParam[0]))->GetBendingSlope());
- extrapSegment->SetNonBendingSlope((&(trackParam[0]))->GetNonBendingSlope());
- chi2 = segment->NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
- if (chi2 < bestChi2) {
- // update best Chi2 and Segment if better found
- bestSegment = segment;
- bestChi2 = chi2;
- }
+ //__________________________________________________________________________
+void AliMUONTrackReconstructor::FollowTrackInStation(AliMUONTrack* trackCandidate, Int_t nextStation)
+{
+ /// Follow trackCandidate in station(0..) nextStation 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.
+ AliDebug(1,Form("Enter FollowTrackInStation(1..) %d", nextStation+1));
+
+ Int_t ch1 = 2*nextStation;
+ Int_t ch2 = 2*nextStation+1;
+ Double_t zCh2 = AliMUONConstants::DefaultChamberZ(ch2);
+ Double_t chi2WithOneHitForRec = 1.e10;
+ Double_t chi2WithTwoHitForRec = 1.e10;
+ Double_t maxChi2WithOneHitForRec = 2.*fgkMaxNormChi2; // 2 because 2 quantities in chi2
+ Double_t maxChi2WithTwoHitForRec = 4.*fgkMaxNormChi2; // 4 because 4 quantities in chi2
+ Double_t bestChi2WithOneHitForRec = maxChi2WithOneHitForRec;
+ Double_t bestChi2WithTwoHitForRec = maxChi2WithTwoHitForRec;
+ AliMUONTrack *newTrack = 0x0;
+ AliMUONHitForRec *hitForRecCh1, *hitForRecCh2;
+ AliMUONHitForRec *bestHitForRec1 = 0x0, *bestHitForRec2 = 0x0;
+ Bool_t *hitForRecCh1Used = new Bool_t[fNHitsForRecPerChamber[ch1]];
+ for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) hitForRecCh1Used[hit1] = kFALSE;
+ //
+ //Extrapolate trackCandidate to chamber "ch2" to save computing time in the next steps
+ AliMUONTrackParam *extrapTrackParamPtr = trackCandidate->GetExtrapTrackParam();
+ *extrapTrackParamPtr = *((AliMUONTrackParam*)(trackCandidate->GetTrackParamAtHit()->First()));
+ AliMUONTrackExtrap::ExtrapToZCov(extrapTrackParamPtr, zCh2);
+ AliMUONTrackParam extrapTrackParamSave(*extrapTrackParamPtr);
+ //
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ TMatrixD* paramCovForDebug = extrapTrackParamPtr->GetCovariances();
+ cout<<endl<<"Track parameter covariances at first hit extrapolated to z = "<<zCh2<<":"<<endl;
+ paramCovForDebug->Print();
+ }
+ //
+ // look for candidates in chamber 2
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: look for hits in chamber(1..): " << ch2+1 << endl;
+ }
+ for (Int_t hit2 = 0; hit2 < fNHitsForRecPerChamber[ch2]; hit2++) {
+ hitForRecCh2 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch2]+hit2);
+ // extrapolate track parameters and covariances only once for this hit
+ AliMUONTrackExtrap::ExtrapToZCov(extrapTrackParamPtr, hitForRecCh2->GetZ());
+ chi2WithOneHitForRec = trackCandidate->TryOneHitForRec(hitForRecCh2);
+ // if good chi2 then try to attach a hitForRec in the other chamber too
+ if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) {
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: look for second hits in chamber(1..): " << ch1+1 << endl;
}
- if (bestSegment) {
- // best segment found: add it to track candidate
- AliMUONTrackExtrap::ExtrapToZ(&(trackParam[0]), bestSegment->GetZ());
- track->AddTrackParamAtHit(&(trackParam[0]),bestSegment->GetHitForRec1());
- AliMUONTrackExtrap::ExtrapToZ(&(trackParam[1]), bestSegment->GetZ()); // now same as trackParam[0] !?!?!?!?!?!
- track->AddTrackParamAtHit(&(trackParam[1]),bestSegment->GetHitForRec2());
- AliDebug(3, Form("FollowTracks: track candidate(0..): %d Added segment in station(0..): %d", trackIndex, station));
- if (AliLog::GetGlobalDebugLevel()>2) track->RecursiveDump();
- } else {
- // No best segment found:
- // Look for best compatible HitForRec in station:
- // should consider all possibilities ????
- // multiple scattering ???? do about like for extrapSegment !!!!
- extrapHit = new AliMUONHitForRec(); // empty hit
- bestChi2 = 3.0;
- bestHit = NULL;
- AliDebug(3, Form("FollowTracks: track candidate(0..): %d Segment not found, look for hit in station(0..): %d ",
- trackIndex, station));
-
- // Loop over chambers of the station
- for (chInStation = 0; chInStation < 2; chInStation++) {
- ch = 2 * station + chInStation;
- for (iHit = fIndexOfFirstHitForRecPerChamber[ch]; iHit < fIndexOfFirstHitForRecPerChamber[ch]+fNHitsForRecPerChamber[ch]; iHit++) {
- hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
- // coordinates of extrapolated hit
- AliMUONTrackExtrap::ExtrapToZ(&(trackParam[chInStation]), hit->GetZ());
- extrapHit->SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
- extrapHit->SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
- // resolutions from "extrapSegment"
- extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
- extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
- // Loop over hits in the chamber
- // condition for hit not already in segment ????
- chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
- if (chi2 < bestChi2) {
- // update best Chi2 and HitForRec if better found
- bestHit = hit;
- bestChi2 = chi2;
- chBestHit = chInStation;
+ Bool_t foundSecondHit = kFALSE;
+ for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) {
+ hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1);
+ chi2WithTwoHitForRec = trackCandidate->TryTwoHitForRec(hitForRecCh2, hitForRecCh1); // order hits like that to save computing time
+ // if good chi2 then create a new track by adding the 2 hitForRec to the "trackCandidate"
+ if (chi2WithTwoHitForRec < maxChi2WithTwoHitForRec) {
+ foundSecondHit = 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);
+ fNRecTracks++;
+ AliMUONTrackParam trackParam1(extrapTrackParamSave);
+ AliMUONTrackExtrap::ExtrapToZ(&trackParam1, hitForRecCh1->GetZ());
+ newTrack->AddTrackParamAtHit(&trackParam1,hitForRecCh1);
+ AliMUONTrackParam trackParam2(extrapTrackParamSave);
+ AliMUONTrackExtrap::ExtrapToZ(&trackParam2, hitForRecCh2->GetZ());
+ newTrack->AddTrackParamAtHit(&trackParam2,hitForRecCh2);
+ // Sort TrackParamAtHit according to increasing Z
+ newTrack->GetTrackParamAtHit()->Sort();
+ // Update the chi2 of the new track
+ if (newTrack->GetFitFMin()<0) newTrack->SetFitFMin(chi2WithTwoHitForRec);
+ else newTrack->SetFitFMin(newTrack->GetFitFMin() + chi2WithTwoHitForRec);
+ // Tag hitForRecCh1 as used
+ hitForRecCh1Used[hit1] = kTRUE;
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: added two hits in station(1..): " << nextStation+1
+ << " (Chi2 = " << chi2WithTwoHitForRec << ")" << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
}
- }
+ } else if (chi2WithTwoHitForRec < bestChi2WithTwoHitForRec) {
+ // keep track of the best couple of hits
+ bestChi2WithTwoHitForRec = chi2WithTwoHitForRec;
+ bestHitForRec1 = hitForRecCh1;
+ bestHitForRec2 = hitForRecCh2;
+ }
}
- if (bestHit) {
- // best hit found: add it to track candidate
- AliMUONTrackExtrap::ExtrapToZ(&(trackParam[chBestHit]), bestHit->GetZ());
- track->AddTrackParamAtHit(&(trackParam[chBestHit]),bestHit);
- if (AliLog::GetGlobalDebugLevel() > 2) {
- cout << "FollowTracks: track candidate(0..): " << trackIndex
- << " Added hit in station(0..): " << station << endl;
- track->RecursiveDump();
- }
- } else {
- // Remove current track candidate
- // and corresponding TrackHit's, ...
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- delete extrapSegment;
- delete extrapHit;
- break; // stop the search for this candidate:
- // exit from the loop over station
- }
- delete extrapHit;
}
- delete extrapSegment;
- // Sort TrackParamAtHit according to increasing Z
- track->GetTrackParamAtHit()->Sort();
- // Update track parameters at first track hit (smallest Z)
- trackParam1 = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First());
- bendingMomentum = 0.;
- if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
- bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
- // Track removed if bendingMomentum not in window [min, max]
- if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- break; // stop the search for this candidate:
- // exit from the loop over station
- }
- // Track fit from parameters at first hit
- // -> with 5 parameters (momentum and position)
- // with multiple Coulomb scattering if all stations
- if (station == 0) Fit(track,1,1);
- // without multiple Coulomb scattering if not all stations
- else Fit(track,1,0);
- Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
- if (numberOfDegFree > 0) {
- chi2Norm = track->GetFitFMin() / numberOfDegFree;
- } else {
- chi2Norm = 1.e10;
+ // if no hitForRecCh1 found then consider to add hitForRecCh2 only
+ if (!foundSecondHit) {
+ 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);
+ fNRecTracks++;
+ AliMUONTrackParam trackParam1(extrapTrackParamSave);
+ AliMUONTrackExtrap::ExtrapToZ(&trackParam1, hitForRecCh2->GetZ());
+ newTrack->AddTrackParamAtHit(&trackParam1,hitForRecCh2);
+ // Sort TrackParamAtHit according to increasing Z
+ newTrack->GetTrackParamAtHit()->Sort();
+ // Update the chi2 of the new track
+ if (newTrack->GetFitFMin()<0) newTrack->SetFitFMin(chi2WithOneHitForRec);
+ else newTrack->SetFitFMin(newTrack->GetFitFMin() + chi2WithOneHitForRec);
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: added one hit in chamber(1..): " << ch2+1
+ << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+ } if (!bestHitForRec2 && chi2WithOneHitForRec < bestChi2WithOneHitForRec) {
+ // keep track of the best single hitForRec except if a couple
+ // of hits has already been found (i.e. bestHitForRec2!=0x0)
+ bestChi2WithOneHitForRec = chi2WithOneHitForRec;
+ bestHitForRec1 = hitForRecCh2;
+ }
}
- // Track removed if normalized chi2 too high
- if (chi2Norm > fMaxChi2) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- break; // stop the search for this candidate:
- // exit from the loop over station
+ }
+ // reset the extrapolated track parameter for next step
+ trackCandidate->SetExtrapTrackParam(&extrapTrackParamSave);
+ }
+ //
+ // 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 || !bestHitForRec2) {
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: look for single hits in chamber(1..): " << ch1+1 << endl;
+ }
+ for (Int_t hit1 = 0; hit1 < fNHitsForRecPerChamber[ch1]; hit1++) {
+ hitForRecCh1 = (AliMUONHitForRec*) fHitsForRecPtr->UncheckedAt(fIndexOfFirstHitForRecPerChamber[ch1]+hit1);
+ if (hitForRecCh1Used[hit1]) continue; // Skip hitForRec already used
+ chi2WithOneHitForRec = trackCandidate->TryOneHitForRec(hitForRecCh1);
+ // if good chi2 then create a new track by adding the good hitForRec in "ch1" to the "trackCandidate"
+ // We do not try to attach a hitForRec in the other chamber too since it has already been done above
+ if (chi2WithOneHitForRec < maxChi2WithOneHitForRec) {
+ 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);
+ fNRecTracks++;
+ AliMUONTrackParam trackParam1(extrapTrackParamSave);
+ AliMUONTrackExtrap::ExtrapToZ(&trackParam1, hitForRecCh1->GetZ());
+ newTrack->AddTrackParamAtHit(&trackParam1,hitForRecCh1);
+ // Sort TrackParamAtHit according to increasing Z
+ newTrack->GetTrackParamAtHit()->Sort();
+ // Update the chi2 of the new track
+ if (newTrack->GetFitFMin()<0) newTrack->SetFitFMin(chi2WithOneHitForRec);
+ else newTrack->SetFitFMin(newTrack->GetFitFMin() + chi2WithOneHitForRec);
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: added one hit in chamber(1..): " << ch1+1
+ << " (Chi2 = " << chi2WithOneHitForRec << ")" << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+ } if (!bestHitForRec2 && chi2WithOneHitForRec < bestChi2WithOneHitForRec) {
+ // keep track of the best single hitForRec except if a couple
+ // of hits has already been found (i.e. bestHitForRec1!=0x0)
+ bestChi2WithOneHitForRec = chi2WithOneHitForRec;
+ bestHitForRec1 = hitForRecCh1;
+ }
}
- if (AliLog::GetGlobalDebugLevel() > 2) {
- cout << "FollowTracks: track candidate(0..): " << trackIndex
- << " after fit from station(0..): " << station << " to 4" << endl;
- track->RecursiveDump();
+ }
+ }
+ //
+ // fill out the best track if required else clean up the fRecTracksPtr array
+ if (!fgkTrackAllTracks && bestHitForRec1) {
+ AliMUONTrackParam trackParam1(extrapTrackParamSave);
+ AliMUONTrackExtrap::ExtrapToZ(&trackParam1, bestHitForRec1->GetZ());
+ trackCandidate->AddTrackParamAtHit(&trackParam1,bestHitForRec1);
+ if (bestHitForRec2) {
+ AliMUONTrackParam trackParam2(extrapTrackParamSave);
+ AliMUONTrackExtrap::ExtrapToZ(&trackParam2, bestHitForRec2->GetZ());
+ trackCandidate->AddTrackParamAtHit(&trackParam2,bestHitForRec2);
+ // Sort TrackParamAtHit according to increasing Z
+ trackCandidate->GetTrackParamAtHit()->Sort();
+ // Update the chi2 of the new track
+ if (trackCandidate->GetFitFMin()<0) trackCandidate->SetFitFMin(bestChi2WithTwoHitForRec);
+ else trackCandidate->SetFitFMin(trackCandidate->GetFitFMin() + bestChi2WithTwoHitForRec);
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: added the two best hits in station(1..): " << nextStation+1
+ << " (Chi2 = " << bestChi2WithTwoHitForRec << ")" << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
}
- // Track extrapolation to the vertex through the absorber (Branson)
- // after going through the first station
- if (station == 0) {
- trackParamVertex = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->First()));
- AliMUONTrackExtrap::ExtrapToVertex(&trackParamVertex, 0., 0., 0.);
- track->SetTrackParamAtVertex(&trackParamVertex);
- if (AliLog::GetGlobalDebugLevel() > 0) {
- cout << "FollowTracks: track candidate(0..): " << trackIndex
- << " after extrapolation to vertex" << endl;
- track->RecursiveDump();
- }
+ } else {
+ // Sort TrackParamAtHit according to increasing Z
+ trackCandidate->GetTrackParamAtHit()->Sort();
+ // Update the chi2 of the new track
+ if (trackCandidate->GetFitFMin()<0) trackCandidate->SetFitFMin(bestChi2WithOneHitForRec);
+ else trackCandidate->SetFitFMin(trackCandidate->GetFitFMin() + bestChi2WithOneHitForRec);
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: added the best hit in station(1..): " << nextStation+1
+ << " (Chi2 = " << bestChi2WithOneHitForRec << ")" << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
}
- } // for (station = 2;...
- // go really to next track
- track = nextTrack;
- } // while (track)
- // Compression of track array (necessary after Remove)
- fRecTracksPtr->Compress();
- return;
+ }
+ } else {
+ fRecTracksPtr->Remove(trackCandidate); // obsolete track
+ fNRecTracks--;
+ }
+
}
//__________________________________________________________________________
-void AliMUONTrackReconstructor::Fit(AliMUONTrack *Track, Int_t FitStart, Int_t FitMCS)
+void AliMUONTrackReconstructor::SetVertexForFit(AliMUONTrack* trackCandidate)
{
- /// Fit the track "Track",
- /// with or without multiple Coulomb scattering according to "FitMCS",
- /// starting, according to "FitStart",
- /// with track parameters at vertex or at the first TrackHit.
+ /// Add the vertex as a measured hit to constrain the fit of the "trackCandidate"
+ /// Compute the vertex resolution from natural vertex dispersion and
+ /// multiple scattering effets according to trackCandidate path in absorber
+ /// It is necessary to account for multiple scattering effects here instead of during the fit of
+ /// the "trackCandidate" to do not influence the result by changing track resolution at vertex
+ AliDebug(1,"Enter SetVertexForFit");
- if ((FitStart != 0) && (FitStart != 1)) {
- cout << "ERROR in AliMUONTrackReconstructor::Fit(...)" << endl;
- cout << "FitStart = " << FitStart << " is neither 0 nor 1" << endl;
- exit(0);
- }
- if ((FitMCS != 0) && (FitMCS != 1)) {
- cout << "ERROR in AliMUONTrackReconstructor::Fit(...)" << endl;
- cout << "FitMCS = " << FitMCS << " is neither 0 nor 1" << endl;
- exit(0);
- }
+ Double_t nonBendingReso2 = fNonBendingVertexDispersion * fNonBendingVertexDispersion;
+ Double_t bendingReso2 = fBendingVertexDispersion * fBendingVertexDispersion;
+ // add multiple scattering effets
+ AliMUONTrackParam paramAtVertex(*((AliMUONTrackParam*)(trackCandidate->GetTrackParamAtHit()->First())));
+ paramAtVertex.DeleteCovariances(); // to be sure to account only for multiple scattering
+ AliMUONTrackExtrap::ExtrapToVertexUncorrected(¶mAtVertex,0.);
+ TMatrixD* paramCov = paramAtVertex.GetCovariances();
+ nonBendingReso2 += (*paramCov)(0,0);
+ bendingReso2 += (*paramCov)(2,2);
+ // Set the vertex
+ AliMUONHitForRec vertex; // Coordinates set to (0.,0.,0.) by default
+ vertex.SetNonBendingReso2(nonBendingReso2);
+ vertex.SetBendingReso2(bendingReso2);
+ trackCandidate->SetVertex(&vertex);
+}
+
+ //__________________________________________________________________________
+void AliMUONTrackReconstructor::Fit(AliMUONTrack *track, Bool_t includeMCS, Bool_t calcCov)
+{
+ /// Fit the track "track" with or without multiple Coulomb scattering according to "includeMCS".
- Double_t arg[1], benC, errorParam, invBenP, lower, nonBenC, upper, x, y;
- char parName[50];
+ Double_t benC, errorParam, invBenP, nonBenC, x, y;
AliMUONTrackParam *trackParam;
- // Check if Minuit is initialized...
- fgFitter = TVirtualFitter::Fitter(Track,5);
- fgFitter->Clear(); // necessary ???? probably yes
- // how to reset the printout number at every fit ????
- // is there any risk to leave it like that ????
- // how to go faster ???? choice of Minuit parameters like EDM ????
- // choice of function to be minimized according to fFitMCS
- if (FitMCS == 0) fgFitter->SetFCN(TrackChi2);
- else fgFitter->SetFCN(TrackChi2MCS);
- // Switch off printout
- arg[0] = -1;
- fgFitter->ExecuteCommand("SET PRINT", arg, 1); // More printing !!!!
+ Double_t arg[1], fedm, errdef, fitFMin;
+ Int_t npari, nparx;
+ Int_t status, covStatus;
+
+ // Instantiate gMinuit if not already done
+ if (!gMinuit) gMinuit = new TMinuit(6);
+ // Clear MINUIT parameters
+ gMinuit->mncler();
+ // Give the fitted track to MINUIT
+ gMinuit->SetObjectFit(track);
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ // Define print level
+ arg[0] = 1;
+ gMinuit->mnexcm("SET PRI", arg, 1, status);
+ // Print covariance matrix
+ gMinuit->mnexcm("SHO COV", arg, 0, status);
+ } else {
+ arg[0] = -1;
+ gMinuit->mnexcm("SET PRI", arg, 1, status);
+ }
// No warnings
- fgFitter->ExecuteCommand("SET NOW", arg, 0);
- // Parameters according to "fFitStart"
- // (should be a function to be used at every place where needed ????)
- if (FitStart == 0) trackParam = Track->GetTrackParamAtVertex();
- else trackParam = (AliMUONTrackParam*) (Track->GetTrackParamAtHit()->First());
- // set first 3 Minuit parameters
+ gMinuit->mnexcm("SET NOW", arg, 0, status);
+ // Define strategy
+ //arg[0] = 2;
+ //gMinuit->mnexcm("SET STR", arg, 1, status);
+
+ // Switch between available FCN according to "includeMCS"
+ if (includeMCS) gMinuit->SetFCN(TrackChi2MCS);
+ else gMinuit->SetFCN(TrackChi2);
+
+ // Set fitted parameters (!! The order is very important for the covariance matrix !!)
+ trackParam = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First());
// could be tried with no limits for the search (min=max=0) ????
- fgFitter->SetParameter(0, "InvBenP",
- trackParam->GetInverseBendingMomentum(),
- 0.003, -0.4, 0.4);
- fgFitter->SetParameter(1, "BenS",
- trackParam->GetBendingSlope(),
- 0.001, -0.5, 0.5);
- fgFitter->SetParameter(2, "NonBenS",
- trackParam->GetNonBendingSlope(),
- 0.001, -0.5, 0.5);
- if (FitStart == 1) {
- // set last 2 Minuit parameters when we start from first track hit
- // mandatory limits in Bending to avoid NaN values of parameters
- fgFitter->SetParameter(3, "X",
- trackParam->GetNonBendingCoor(),
- 0.03, -500.0, 500.0);
- // mandatory limits in non Bending to avoid NaN values of parameters
- fgFitter->SetParameter(4, "Y",
- trackParam->GetBendingCoor(),
- 0.10, -500.0, 500.0);
- }
- // search without gradient calculation in the function
- fgFitter->ExecuteCommand("SET NOGRADIENT", arg, 0);
+ // mandatory limits in non Bending to avoid NaN values of parameters
+ gMinuit->mnparm(0, "X", trackParam->GetNonBendingCoor(), 0.03, -500.0, 500.0, status);
+ gMinuit->mnparm(1, "NonBenS", trackParam->GetNonBendingSlope(), 0.001, -0.5, 0.5, status);
+ // mandatory limits in Bending to avoid NaN values of parameters
+ gMinuit->mnparm(2, "Y", trackParam->GetBendingCoor(), 0.10, -500.0, 500.0, status);
+ gMinuit->mnparm(3, "BenS", trackParam->GetBendingSlope(), 0.001, -0.5, 0.5, status);
+ gMinuit->mnparm(4, "InvBenP", trackParam->GetInverseBendingMomentum(), 0.003, -0.4, 0.4, status);
+
// minimization
- fgFitter->ExecuteCommand("MINIMIZE", arg, 0);
- // exit from Minuit
- // fgFitter->ExecuteCommand("EXIT", arg, 0); // necessary ????
+ gMinuit->mnexcm("MIGRAD", arg, 0, status);
+
+ // Calculate the covariance matrix more accurately if required
+ if (calcCov) gMinuit->mnexcm("HESSE", arg, 0, status);
+
// get results into "invBenP", "benC", "nonBenC" ("x", "y")
- fgFitter->GetParameter(0, parName, invBenP, errorParam, lower, upper);
- trackParam->SetInverseBendingMomentum(invBenP);
- fgFitter->GetParameter(1, parName, benC, errorParam, lower, upper);
- trackParam->SetBendingSlope(benC);
- fgFitter->GetParameter(2, parName, nonBenC, errorParam, lower, upper);
+ gMinuit->GetParameter(0, x, errorParam);
+ trackParam->SetNonBendingCoor(x);
+ gMinuit->GetParameter(1, nonBenC, errorParam);
trackParam->SetNonBendingSlope(nonBenC);
- if (FitStart == 1) {
- fgFitter->GetParameter(3, parName, x, errorParam, lower, upper);
- trackParam->SetNonBendingCoor(x);
- fgFitter->GetParameter(4, parName, y, errorParam, lower, upper);
- trackParam->SetBendingCoor(y);
- }
+ gMinuit->GetParameter(2, y, errorParam);
+ trackParam->SetBendingCoor(y);
+ gMinuit->GetParameter(3, benC, errorParam);
+ trackParam->SetBendingSlope(benC);
+ gMinuit->GetParameter(4, invBenP, errorParam);
+ trackParam->SetInverseBendingMomentum(invBenP);
+
// global result of the fit
- Double_t fedm, errdef, fitFMin;
- Int_t npari, nparx;
- fgFitter->GetStats(fitFMin, fedm, errdef, npari, nparx);
- Track->SetFitFMin(fitFMin);
+ gMinuit->mnstat(fitFMin, fedm, errdef, npari, nparx, covStatus);
+ track->SetFitFMin(fitFMin);
+
+ // Get the covariance matrix if required
+ if (calcCov) {
+ // Covariance matrix according to HESSE status
+ // If problem then keep only the diagonal terms (variances)
+ Double_t matrix[5][5];
+ gMinuit->mnemat(&matrix[0][0],5);
+ if (covStatus == 3) trackParam->SetCovariances(matrix);
+ else trackParam->SetVariances(matrix);
+ } else *(trackParam->GetCovariances()) = 0;
+
}
//__________________________________________________________________________
-void TrackChi2(Int_t &NParam, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/)
+void TrackChi2(Int_t & /*NParam*/, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/)
{
/// Return the "Chi2" to be minimized with Minuit for track fitting,
/// with "NParam" parameters
/// Assumes that the track hits are sorted according to increasing Z.
/// Track parameters at each TrackHit are updated accordingly.
/// Multiple Coulomb scattering is not taken into account
- AliMUONTrack *trackBeingFitted;
+
+ AliMUONTrack *trackBeingFitted = (AliMUONTrack*) gMinuit->GetObjectFit();
+// AliMUONTrack *trackBeingFitted = (AliMUONTrack*) AliMUONTrackReconstructor::Fitter()->GetObjectFit();
AliMUONTrackParam param1;
AliMUONTrackParam* trackParamAtHit;
AliMUONHitForRec* hitForRec;
Chi2 = 0.0; // initialize Chi2
+ Double_t dX, dY;
+
// copy of track parameters to be fitted
- trackBeingFitted = (AliMUONTrack*) AliMUONTrackReconstructor::Fitter()->GetObjectFit();
- // 3 parameters means fit track candidate from parameters at vertex (X_vertex and Y_vertex are fixed)
- if (NParam == 3) param1 = *(trackBeingFitted->GetTrackParamAtVertex());
- else param1 = *((AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->First()));
- // Minuit parameters to be fitted into this copy
- param1.SetInverseBendingMomentum(Param[0]);
- param1.SetBendingSlope(Param[1]);
- param1.SetNonBendingSlope(Param[2]);
- if (NParam == 5) {
- param1.SetNonBendingCoor(Param[3]);
- param1.SetBendingCoor(Param[4]);
+ param1 = *((AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->First()));
+ param1.SetNonBendingCoor(Param[0]);
+ param1.SetNonBendingSlope(Param[1]);
+ param1.SetBendingCoor(Param[2]);
+ param1.SetBendingSlope(Param[3]);
+ param1.SetInverseBendingMomentum(Param[4]);
+
+ // Take the vertex into account in the fit if required
+ if (trackBeingFitted->GetFitWithVertex()) {
+ AliMUONTrackParam paramAtVertex(param1);
+ AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex, 0.);
+ AliMUONHitForRec *vertex = trackBeingFitted->GetVertex();
+ if (!vertex) {
+ cout<<"Error in TrackChi2: Want to use the vertex in tracking but it has not been created!!"<<endl;
+ exit(-1);
+ }
+ dX = vertex->GetNonBendingCoor() - paramAtVertex.GetNonBendingCoor();
+ dY = vertex->GetBendingCoor() - paramAtVertex.GetBendingCoor();
+ Chi2 += dX * dX / vertex->GetNonBendingReso2() + dY * dY / vertex->GetBendingReso2();
}
+
// Follow track through all planes of track hits
trackParamAtHit = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->First());
while (trackParamAtHit) {
// Increment Chi2
// done hit per hit, with hit resolution,
// and not with point and angle like in "reco_muon.F" !!!!
- // Needs to add multiple scattering contribution ????
- Double_t dX = hitForRec->GetNonBendingCoor() - param1.GetNonBendingCoor();
- Double_t dY = hitForRec->GetBendingCoor() - param1.GetBendingCoor();
+ dX = hitForRec->GetNonBendingCoor() - param1.GetNonBendingCoor();
+ dY = hitForRec->GetBendingCoor() - param1.GetBendingCoor();
Chi2 = Chi2 + dX * dX / hitForRec->GetNonBendingReso2() + dY * dY / hitForRec->GetBendingReso2();
trackParamAtHit = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->After(trackParamAtHit));
}
}
//__________________________________________________________________________
-void TrackChi2MCS(Int_t &NParam, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/)
+void TrackChi2MCS(Int_t & /*NParam*/, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/)
{
/// Return the "Chi2" to be minimized with Minuit for track fitting,
/// with "NParam" parameters
/// Assumes that the track hits are sorted according to increasing Z.
/// Track parameters at each TrackHit are updated accordingly.
/// Multiple Coulomb scattering is taken into account with covariance matrix.
- AliMUONTrack *trackBeingFitted;
+
+ AliMUONTrack *trackBeingFitted = (AliMUONTrack*) gMinuit->GetObjectFit();
+// AliMUONTrack *trackBeingFitted = (AliMUONTrack*) AliMUONTrackReconstructor::Fitter()->GetObjectFit();
AliMUONTrackParam param1;
AliMUONTrackParam* trackParamAtHit;
AliMUONHitForRec* hitForRec;
Chi2 = 0.0; // initialize Chi2
- // copy of track parameters to be fitted
- trackBeingFitted = (AliMUONTrack*) AliMUONTrackReconstructor::Fitter()->GetObjectFit();
- // 3 parameters means fit track candidate from parameters at vertex (X_vertex and Y_vertex are fixed)
- if (NParam == 3) param1 = *(trackBeingFitted->GetTrackParamAtVertex());
- else param1 = *((AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->First()));
- // Minuit parameters to be fitted into this copy
- param1.SetInverseBendingMomentum(Param[0]);
- param1.SetBendingSlope(Param[1]);
- param1.SetNonBendingSlope(Param[2]);
- if (NParam == 5) {
- param1.SetNonBendingCoor(Param[3]);
- param1.SetBendingCoor(Param[4]);
- }
-
Int_t chCurrent, chPrev = 0, hitNumber, hitNumber1, hitNumber2, hitNumber3;
Double_t z1, z2, z3;
AliMUONTrackParam *trackParamAtHit1, *trackParamAtHit2, *trackParamAtHit3;
TMatrixD *covBending = new TMatrixD(numberOfHit, numberOfHit);
TMatrixD *covNonBending = new TMatrixD(numberOfHit, numberOfHit);
Double_t *msa2 = new Double_t[numberOfHit];
+
+ // copy of track parameters to be fitted
+ param1 = *((AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->First()));
+ param1.SetNonBendingCoor(Param[0]);
+ param1.SetNonBendingSlope(Param[1]);
+ param1.SetBendingCoor(Param[2]);
+ param1.SetBendingSlope(Param[3]);
+ param1.SetInverseBendingMomentum(Param[4]);
- // Predicted coordinates and multiple scattering angles are first calculated
+ // Take the vertex into account in the fit if required
+ if (trackBeingFitted->GetFitWithVertex()) {
+ AliMUONTrackParam paramAtVertex(param1);
+ AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex, 0.);
+ AliMUONHitForRec *vertex = trackBeingFitted->GetVertex();
+ if (!vertex) {
+ cout<<"Error in TrackChi2MCS: Want to use the vertex in tracking but it has not been created!!"<<endl;
+ exit(-1);
+ }
+ Double_t dX = vertex->GetNonBendingCoor() - paramAtVertex.GetNonBendingCoor();
+ Double_t dY = vertex->GetBendingCoor() - paramAtVertex.GetBendingCoor();
+ Chi2 += dX * dX / vertex->GetNonBendingReso2() + dY * dY / vertex->GetBendingReso2();
+ }
+
+ // Predicted coordinates and multiple scattering angles are first calculated
for (hitNumber = 0; hitNumber < numberOfHit; hitNumber++) {
trackParamAtHit = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber));
hitForRec = trackParamAtHit->GetHitForRecPtr();
} // for (hitNumber1 = 0;...
// Inversion of covariance matrices
- // with "mnvertLocal", local "mnvert" function of Minuit.
- // One cannot use directly "mnvert" since "TVirtualFitter" does not know it.
- // One will have to replace this local function by the right inversion function
- // from a specialized Root package for symmetric positive definite matrices,
- // when available!!!!
Int_t ifailBending;
- mnvertLocal(&((*covBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, ifailBending);
+ gMinuit->mnvert(&((*covBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, ifailBending);
Int_t ifailNonBending;
- mnvertLocal(&((*covNonBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, ifailNonBending);
+ gMinuit->mnvert(&((*covNonBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, ifailNonBending);
// It would be worth trying to calculate the inverse of the covariance matrix
// only once per fit, since it cannot change much in principle,
delete [] msa2;
}
+ //__________________________________________________________________________
Double_t MultipleScatteringAngle2(AliMUONTrackParam *param)
{
/// Returns square of multiple Coulomb scattering angle
/// from TrackParamAtHit pointed to by "param"
Double_t slopeBending, slopeNonBending, radiationLength, inverseBendingMomentum2, inverseTotalMomentum2;
Double_t varMultipleScatteringAngle;
- // Better implementation in AliMUONTrack class ????
slopeBending = param->GetBendingSlope();
slopeNonBending = param->GetNonBendingSlope();
// thickness in radiation length for the current track,
// taking local angle into account
- radiationLength = AliMUONConstants::DefaultChamberThicknessInX0() *
+ radiationLength = AliMUONConstants::ChamberThicknessInX0() *
TMath::Sqrt(1.0 + slopeBending*slopeBending + slopeNonBending*slopeNonBending);
inverseBendingMomentum2 = param->GetInverseBendingMomentum() * param->GetInverseBendingMomentum();
inverseTotalMomentum2 = inverseBendingMomentum2 * (1.0 + slopeBending * slopeBending) /
return varMultipleScatteringAngle;
}
-//______________________________________________________________________________
- void mnvertLocal(Double_t *a, Int_t l, Int_t, Int_t n, Int_t &ifail)
-{
-///*-*-*-*-*-*-*-*-*-*-*-*Inverts a symmetric matrix*-*-*-*-*-*-*-*-*-*-*-*-*
-///*-* ==========================
-///*-* inverts a symmetric matrix. matrix is first scaled to
-///*-* have all ones on the diagonal (equivalent to change of units)
-///*-* but no pivoting is done since matrix is positive-definite.
-///*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
-
- // taken from TMinuit package of Root (l>=n)
- // fVERTs, fVERTq and fVERTpp changed to localVERTs, localVERTq and localVERTpp
- // Double_t localVERTs[n], localVERTq[n], localVERTpp[n];
- Double_t * localVERTs = new Double_t[n];
- Double_t * localVERTq = new Double_t[n];
- Double_t * localVERTpp = new Double_t[n];
- // fMaxint changed to localMaxint
- Int_t localMaxint = n;
-
- /* System generated locals */
- Int_t aOffset;
-
- /* Local variables */
- Double_t si;
- Int_t i, j, k, kp1, km1;
-
- /* Parameter adjustments */
- aOffset = l + 1;
- a -= aOffset;
-
- /* Function Body */
- ifail = 0;
- if (n < 1) goto L100;
- if (n > localMaxint) goto L100;
-//*-*- scale matrix by sqrt of diag elements
- for (i = 1; i <= n; ++i) {
- si = a[i + i*l];
- if (si <= 0) goto L100;
- localVERTs[i-1] = 1 / TMath::Sqrt(si);
- }
- for (i = 1; i <= n; ++i) {
- for (j = 1; j <= n; ++j) {
- a[i + j*l] = a[i + j*l]*localVERTs[i-1]*localVERTs[j-1];
- }
- }
-//*-*- . . . start main loop . . . .
- for (i = 1; i <= n; ++i) {
- k = i;
-//*-*- preparation for elimination step1
- if (a[k + k*l] != 0) localVERTq[k-1] = 1 / a[k + k*l];
- else goto L100;
- localVERTpp[k-1] = 1;
- a[k + k*l] = 0;
- kp1 = k + 1;
- km1 = k - 1;
- if (km1 < 0) goto L100;
- else if (km1 == 0) goto L50;
- else goto L40;
-L40:
- for (j = 1; j <= km1; ++j) {
- localVERTpp[j-1] = a[j + k*l];
- localVERTq[j-1] = a[j + k*l]*localVERTq[k-1];
- a[j + k*l] = 0;
- }
-L50:
- if (k - n < 0) goto L51;
- else if (k - n == 0) goto L60;
- else goto L100;
-L51:
- for (j = kp1; j <= n; ++j) {
- localVERTpp[j-1] = a[k + j*l];
- localVERTq[j-1] = -a[k + j*l]*localVERTq[k-1];
- a[k + j*l] = 0;
- }
-//*-*- elimination proper
-L60:
- for (j = 1; j <= n; ++j) {
- for (k = j; k <= n; ++k) { a[j + k*l] += localVERTpp[j-1]*localVERTq[k-1]; }
- }
- }
-//*-*- elements of left diagonal and unscaling
- for (j = 1; j <= n; ++j) {
- for (k = 1; k <= j; ++k) {
- a[k + j*l] = a[k + j*l]*localVERTs[k-1]*localVERTs[j-1];
- a[j + k*l] = a[k + j*l];
- }
- }
- delete [] localVERTs;
- delete [] localVERTq;
- delete [] localVERTpp;
- return;
-//*-*- failure return
-L100:
- delete [] localVERTs;
- delete [] localVERTq;
- delete [] localVERTpp;
- ifail = 1;
-} /* mnvertLocal */
-
//__________________________________________________________________________
-void AliMUONTrackReconstructor::RemoveDoubleTracks(void)
+void AliMUONTrackReconstructor::FillMUONTrack(void)
{
- /// To remove double tracks.
- /// Tracks are considered identical
- /// if they have at least half of their hits in common.
- /// 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 ((4 * hitsInCommon) >= (nHits1 + 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);
- fNRecTracks--;
- fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
- } 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);
- fNRecTracks--;
- fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
- removedTrack1 = kTRUE;
- break;
- }
- } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
- } // track2
- if (removedTrack1) continue;
- track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
- } // track1
- return;
-}
-
- //__________________________________________________________________________
-void AliMUONTrackReconstructor::UpdateHitForRecAtHit()
-{
- /// Set cluster parameters after track fitting. Fill fHitForRecAtHit of AliMUONTrack's
+ /// Fill AliMUONTrack's fHitForRecAtHit array
+ /// Recompute track parameters and covariances at each attached cluster from those at the first one
AliMUONTrack *track;
+ AliMUONTrackParam trackParam;
AliMUONTrackParam *trackParamAtHit;
+ AliMUONHitForRec *hitForRecAtHit;
+
track = (AliMUONTrack*) fRecTracksPtr->First();
while (track) {
trackParamAtHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First());
+ trackParam = *trackParamAtHit;
while (trackParamAtHit) {
- track->AddHitForRecAtHit(trackParamAtHit->GetHitForRecPtr());
+ hitForRecAtHit = trackParamAtHit->GetHitForRecPtr();
+ // extrapolation to the plane of the hitForRec attached to the current trackParamAtHit
+ AliMUONTrackExtrap::ExtrapToZCov(&trackParam, hitForRecAtHit->GetZ());
+ // update track parameters of the current hit
+ trackParamAtHit->SetTrackParam(trackParam);
+ // update covariance matrix of track parameters of the current hit
+ trackParamAtHit->SetCovariances(trackParam.GetCovariances());
+ // update array of track hit
+ track->AddHitForRecAtHit(hitForRecAtHit);
+ // prepare next step, add MCS effects in parameter covariances
+ AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
trackParamAtHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->After(trackParamAtHit));
}
track = (AliMUONTrack*) fRecTracksPtr->After(track);
/// Dump reconstructed event (track parameters at vertex and at first hit),
/// and the particle parameters
AliMUONTrack *track;
- AliMUONTrackParam *trackParam, *trackParam1;
+ AliMUONTrackParam trackParam, *trackParam1;
Double_t bendingSlope, nonBendingSlope, pYZ;
Double_t pX, pY, pZ, x, y, z, c;
Int_t trackIndex, nTrackHits;
nTrackHits = track->GetNTrackHits();
AliDebug(1, Form("Number of track hits: %d ", nTrackHits));
// track parameters at Vertex
- trackParam = track->GetTrackParamAtVertex();
- x = trackParam->GetNonBendingCoor();
- y = trackParam->GetBendingCoor();
- z = trackParam->GetZ();
- bendingSlope = trackParam->GetBendingSlope();
- nonBendingSlope = trackParam->GetNonBendingSlope();
- pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
+ trackParam = (*((AliMUONTrackParam*) track->GetTrackParamAtHit()->First()));
+ AliMUONTrackExtrap::ExtrapToVertex(&trackParam,0.,0.,0.);
+ x = trackParam.GetNonBendingCoor();
+ y = trackParam.GetBendingCoor();
+ z = trackParam.GetZ();
+ bendingSlope = trackParam.GetBendingSlope();
+ nonBendingSlope = trackParam.GetNonBendingSlope();
+ pYZ = 1/TMath::Abs(trackParam.GetInverseBendingMomentum());
pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
pX = pZ * nonBendingSlope;
pY = pZ * bendingSlope;
- c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
+ c = TMath::Sign(1.0, trackParam.GetInverseBendingMomentum());
AliDebug(1, Form("Track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
z, x, y, pX, pY, pZ, c));
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff