* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.3 2000/06/25 13:23:28 hristov
-stdlib.h needed for non-Linux compilation
+/* $Id$ */
-Revision 1.2 2000/06/15 07:58:48 morsch
-Code from MUON-dev joined
-
-Revision 1.1.2.3 2000/06/12 10:11:34 morsch
-Dummy copy constructor and assignment operator added
-
-Revision 1.1.2.2 2000/06/09 12:58:05 gosset
-Removed comment beginnings in Log sections of .cxx files
-Suppressed most violations of coding rules
-
-Revision 1.1.2.1 2000/06/07 14:44:53 gosset
-Addition of files for track reconstruction in C++
-*/
-
-//__________________________________________________________________________
-//
+//-----------------------------------------------------------------------------
+// Class AliMUONTrack
+//-------------------
// Reconstructed track in ALICE dimuon spectrometer
-//__________________________________________________________________________
+//-----------------------------------------------------------------------------
#include "AliMUONTrack.h"
-#include <iostream.h>
+#include "AliMUONReconstructor.h"
+#include "AliMUONVCluster.h"
+#include "AliMUONVClusterStore.h"
+#include "AliMUONObjectPair.h"
+#include "AliMUONTrackExtrap.h"
+#include "AliMUONConstants.h"
+#include "AliMUONTrackParam.h"
-#include <TClonesArray.h>
-#include <TMinuit.h>
-#include <TMath.h>
-#include <TMatrix.h>
+#include "AliLog.h"
-#include "AliMUONEventReconstructor.h"
-#include "AliMUONHitForRec.h"
-#include "AliMUONSegment.h"
-#include "AliMUONTrackHit.h"
+#include <TMath.h>
-#include <stdlib.h>
+#include <Riostream.h>
-// variables to be known from minimization functions
-static AliMUONTrack *trackBeingFitted;
-static AliMUONTrackParam *trackParamBeingFitted;
+using std::setw;
+using std::endl;
+using std::cout;
+using std::streamsize;
+using std::setprecision;
+/// \cond CLASSIMP
+ClassImp(AliMUONTrack) // Class implementation in ROOT context
+/// \endcond
-// 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);
-Double_t MultipleScatteringAngle2(AliMUONTrackHit *TrackHit);
+const Double_t AliMUONTrack::fgkMaxChi2 = 1.e10; ///< maximum chi2 above which the track can be considered as abnormal
-ClassImp(AliMUONTrack) // Class implementation in ROOT context
- //__________________________________________________________________________
-AliMUONTrack::AliMUONTrack(AliMUONSegment* BegSegment, AliMUONSegment* EndSegment, AliMUONEventReconstructor* EventReconstructor)
+//__________________________________________________________________________
+AliMUONTrack::AliMUONTrack()
+ : TObject(),
+ fTrackParamAtCluster(0x0),
+ fFitWithVertex(kFALSE),
+ fVertexErrXY2(),
+ fFitWithMCS(kFALSE),
+ fClusterWeightsNonBending(0x0),
+ fClusterWeightsBending(0x0),
+ fGlobalChi2(-1.),
+ fImproved(kFALSE),
+ fMatchTrigger(-1),
+ fChi2MatchTrigger(0.),
+ fTrackID(-1),
+ fTrackParamAtVertex(0x0),
+ fHitsPatternInTrigCh(0),
+ fHitsPatternInTrigChTrk(0),
+ fLocalTrigger(0),
+ fConnected(kFALSE)
{
- // Constructor from two Segment's
- fEventReconstructor = EventReconstructor; // link back to EventReconstructor
- // memory allocation for the TClonesArray of reconstructed TrackHit's
- fTrackHitsPtr = new TClonesArray("AliMUONTrackHit", 10);
- fNTrackHits = 0;
- AddSegment(BegSegment); // add hits from BegSegment
- AddSegment(EndSegment); // add hits from EndSegment
- fTrackHitsPtr->Sort(); // sort TrackHits according to increasing Z
- SetTrackParamAtVertex(); // set track parameters at vertex
- fFitMCS = 0;
- return;
+ /// Default constructor
+ fVertexErrXY2[0] = 0.;
+ fVertexErrXY2[1] = 0.;
}
//__________________________________________________________________________
-AliMUONTrack::AliMUONTrack(AliMUONSegment* Segment, AliMUONHitForRec* HitForRec, AliMUONEventReconstructor* EventReconstructor)
+AliMUONTrack::AliMUONTrack(AliMUONObjectPair *segment, Double_t bendingVertexDispersion)
+ : TObject(),
+ fTrackParamAtCluster(new TObjArray(20)),
+ fFitWithVertex(kFALSE),
+ fVertexErrXY2(),
+ fFitWithMCS(kFALSE),
+ fClusterWeightsNonBending(0x0),
+ fClusterWeightsBending(0x0),
+ fGlobalChi2(0.),
+ fImproved(kFALSE),
+ fMatchTrigger(-1),
+ fChi2MatchTrigger(0.),
+ fTrackID(-1),
+ fTrackParamAtVertex(0x0),
+ fHitsPatternInTrigCh(0),
+ fHitsPatternInTrigChTrk(0),
+ fLocalTrigger(0),
+ fConnected(kFALSE)
{
- // Constructor from one Segment and one HitForRec
- fEventReconstructor = EventReconstructor; // link back to EventReconstructor
- // memory allocation for the TClonesArray of reconstructed TrackHit's
- fTrackHitsPtr = new TClonesArray("AliMUONTrackHit", 10);
- fNTrackHits = 0;
- AddSegment(Segment); // add hits from Segment
- AddHitForRec(HitForRec); // add HitForRec
- fTrackHitsPtr->Sort(); // sort TrackHits according to increasing Z
- SetTrackParamAtVertex(); // set track parameters at vertex
- fFitMCS = 0;
- return;
+ /// Constructor from two clusters
+
+ fTrackParamAtCluster->SetOwner(kTRUE);
+
+ fVertexErrXY2[0] = 0.;
+ fVertexErrXY2[1] = 0.;
+
+ // Pointers to clusters from the segment
+ AliMUONVCluster* firstCluster = (AliMUONVCluster*) segment->First();
+ AliMUONVCluster* lastCluster = (AliMUONVCluster*) segment->Second();
+
+ // Compute track parameters
+ Double_t z1 = firstCluster->GetZ();
+ Double_t z2 = lastCluster->GetZ();
+ Double_t dZ = z1 - z2;
+ // Non bending plane
+ Double_t nonBendingCoor1 = firstCluster->GetX();
+ Double_t nonBendingCoor2 = lastCluster->GetX();
+ Double_t nonBendingSlope = (nonBendingCoor1 - nonBendingCoor2) / dZ;
+ // Bending plane
+ Double_t bendingCoor1 = firstCluster->GetY();
+ Double_t bendingCoor2 = lastCluster->GetY();
+ Double_t bendingSlope = (bendingCoor1 - bendingCoor2) / dZ;
+ // Inverse bending momentum
+ Double_t bendingImpact = bendingCoor1 - z1 * bendingSlope;
+ Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact);
+
+ // Set track parameters at first cluster
+ AliMUONTrackParam trackParamAtFirstCluster;
+ trackParamAtFirstCluster.SetZ(z1);
+ trackParamAtFirstCluster.SetNonBendingCoor(nonBendingCoor1);
+ trackParamAtFirstCluster.SetNonBendingSlope(nonBendingSlope);
+ trackParamAtFirstCluster.SetBendingCoor(bendingCoor1);
+ trackParamAtFirstCluster.SetBendingSlope(bendingSlope);
+ trackParamAtFirstCluster.SetInverseBendingMomentum(inverseBendingMomentum);
+
+ // Set track parameters at last cluster
+ AliMUONTrackParam trackParamAtLastCluster;
+ trackParamAtLastCluster.SetZ(z2);
+ trackParamAtLastCluster.SetNonBendingCoor(nonBendingCoor2);
+ trackParamAtLastCluster.SetNonBendingSlope(nonBendingSlope);
+ trackParamAtLastCluster.SetBendingCoor(bendingCoor2);
+ trackParamAtLastCluster.SetBendingSlope(bendingSlope);
+ trackParamAtLastCluster.SetInverseBendingMomentum(inverseBendingMomentum);
+
+ // Compute and set track parameters covariances at first cluster
+ TMatrixD paramCov(5,5);
+ paramCov.Zero();
+ // Non bending plane
+ paramCov(0,0) = firstCluster->GetErrX2();
+ paramCov(0,1) = firstCluster->GetErrX2() / dZ;
+ paramCov(1,0) = paramCov(0,1);
+ paramCov(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ;
+ // Bending plane
+ paramCov(2,2) = firstCluster->GetErrY2();
+ paramCov(2,3) = firstCluster->GetErrY2() / dZ;
+ paramCov(3,2) = paramCov(2,3);
+ paramCov(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ;
+ // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
+ if (AliMUONTrackExtrap::IsFieldON()) {
+ paramCov(4,4) = ( ( bendingVertexDispersion*bendingVertexDispersion +
+ (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) /
+ bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum ;
+ paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ paramCov(4,2) = paramCov(2,4);
+ paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ;
+ paramCov(4,3) = paramCov(3,4);
+ } else paramCov(4,4) = inverseBendingMomentum*inverseBendingMomentum;
+ trackParamAtFirstCluster.SetCovariances(paramCov);
+
+ // Compute and set track parameters covariances at last cluster
+ // Non bending plane
+ paramCov(0,0) = lastCluster->GetErrX2();
+ paramCov(0,1) = - lastCluster->GetErrX2() / dZ;
+ paramCov(1,0) = paramCov(0,1);
+ // Bending plane
+ paramCov(2,2) = lastCluster->GetErrY2();
+ paramCov(2,3) = - lastCluster->GetErrY2() / dZ;
+ paramCov(3,2) = paramCov(2,3);
+ // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
+ if (AliMUONTrackExtrap::IsFieldON()) {
+ paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ paramCov(4,2) = paramCov(2,4);
+ }
+ trackParamAtLastCluster.SetCovariances(paramCov);
+
+ // Add track parameters at clusters
+ AddTrackParamAtCluster(trackParamAtFirstCluster,*firstCluster);
+ AddTrackParamAtCluster(trackParamAtLastCluster,*lastCluster);
+
}
-AliMUONTrack::AliMUONTrack (const AliMUONTrack& MUONTrack)
+//__________________________________________________________________________
+AliMUONTrack::AliMUONTrack(const AliMUONTrack& track)
+ : TObject(track),
+ fTrackParamAtCluster(0x0),
+ fFitWithVertex(track.fFitWithVertex),
+ fVertexErrXY2(),
+ fFitWithMCS(track.fFitWithMCS),
+ fClusterWeightsNonBending(0x0),
+ fClusterWeightsBending(0x0),
+ fGlobalChi2(track.fGlobalChi2),
+ fImproved(track.fImproved),
+ fMatchTrigger(track.fMatchTrigger),
+ fChi2MatchTrigger(track.fChi2MatchTrigger),
+ fTrackID(track.fTrackID),
+ fTrackParamAtVertex(0x0),
+ fHitsPatternInTrigCh(track.fHitsPatternInTrigCh),
+ fHitsPatternInTrigChTrk(track.fHitsPatternInTrigChTrk),
+ fLocalTrigger(track.fLocalTrigger),
+ fConnected(track.fConnected)
{
-// Dummy copy constructor
+ ///copy constructor
+
+ // necessary to make a copy of the objects and not only the pointers in TObjArray.
+ if (track.fTrackParamAtCluster) {
+ fTrackParamAtCluster = new TObjArray(track.fTrackParamAtCluster->GetSize());
+ fTrackParamAtCluster->SetOwner(kTRUE);
+ for (Int_t i = 0; i < track.GetNClusters(); i++)
+ fTrackParamAtCluster->AddLast(new AliMUONTrackParam(*static_cast<AliMUONTrackParam*>(track.fTrackParamAtCluster->UncheckedAt(i))));
+ }
+
+ // copy vertex resolution square used during the tracking procedure
+ fVertexErrXY2[0] = track.fVertexErrXY2[0];
+ fVertexErrXY2[1] = track.fVertexErrXY2[1];
+
+ // copy cluster weights matrices if any
+ if (track.fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending));
+ if (track.fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending));
+
+ // copy track parameters at vertex if any
+ if (track.fTrackParamAtVertex) fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex));
+
}
-AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& MUONTrack)
+ //__________________________________________________________________________
+AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& track)
{
-// Dummy assignment operator
+ /// Asignment operator
+ // check assignement to self
+ if (this == &track)
return *this;
+
+ // base class assignement
+ TObject::operator=(track);
+
+ // clear memory
+ Clear();
+
+ // necessary to make a copy of the objects and not only the pointers in TObjArray
+ if (track.fTrackParamAtCluster) {
+ fTrackParamAtCluster = new TObjArray(track.fTrackParamAtCluster->GetSize());
+ fTrackParamAtCluster->SetOwner(kTRUE);
+ for (Int_t i = 0; i < track.GetNClusters(); i++)
+ fTrackParamAtCluster->AddLast(new AliMUONTrackParam(*static_cast<AliMUONTrackParam*>(track.fTrackParamAtCluster->UncheckedAt(i))));
+ }
+
+ // copy cluster weights matrix if any
+ if (track.fClusterWeightsNonBending) {
+ if (fClusterWeightsNonBending) {
+ fClusterWeightsNonBending->ResizeTo(*(track.fClusterWeightsNonBending));
+ *fClusterWeightsNonBending = *(track.fClusterWeightsNonBending);
+ } else fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending));
+ }
+
+ // copy cluster weights matrix if any
+ if (track.fClusterWeightsBending) {
+ if (fClusterWeightsBending) {
+ fClusterWeightsBending->ResizeTo(*(track.fClusterWeightsBending));
+ *fClusterWeightsBending = *(track.fClusterWeightsBending);
+ } else fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending));
+ }
+
+ // copy track parameters at vertex if any
+ if (track.fTrackParamAtVertex) {
+ if (fTrackParamAtVertex) *fTrackParamAtVertex = *(track.fTrackParamAtVertex);
+ else fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex));
+ }
+
+ fFitWithVertex = track.fFitWithVertex;
+ fVertexErrXY2[0] = track.fVertexErrXY2[0];
+ fVertexErrXY2[1] = track.fVertexErrXY2[1];
+ fFitWithMCS = track.fFitWithMCS;
+ fGlobalChi2 = track.fGlobalChi2;
+ fImproved = track.fImproved;
+ fMatchTrigger = track.fMatchTrigger;
+ fChi2MatchTrigger = track.fChi2MatchTrigger;
+ fTrackID = track.fTrackID;
+ fHitsPatternInTrigCh = track.fHitsPatternInTrigCh;
+ fHitsPatternInTrigChTrk = track.fHitsPatternInTrigChTrk;
+ fLocalTrigger = track.fLocalTrigger;
+ fConnected = track.fConnected;
+
+ return *this;
}
//__________________________________________________________________________
-void AliMUONTrack::SetFitMCS(Int_t FitMCS)
+AliMUONTrack::~AliMUONTrack()
{
- // Set track fit option with or without multiple Coulomb scattering
- // from "FitMCS" argument: 0 without, 1 with
- fFitMCS = FitMCS;
- // better implementation with enum(with, without) ????
- return;
+ /// Destructor
+ delete fTrackParamAtCluster;
+ delete fClusterWeightsNonBending;
+ delete fClusterWeightsBending;
+ delete fTrackParamAtVertex;
}
-// Inline functions for Get and Set: inline removed because it does not work !!!!
-AliMUONTrackParam* AliMUONTrack::GetTrackParamAtVertex(void) {
- // Get pointer to fTrackParamAtVertex
- return &fTrackParamAtVertex;}
-AliMUONTrackParam* AliMUONTrack::GetTrackParamAtFirstHit(void) {
- // Get pointer to TrackParamAtFirstHit
- return ((AliMUONTrackHit*) (fTrackHitsPtr->First()))->GetTrackParam();}
-TClonesArray* AliMUONTrack::GetTrackHitsPtr(void) {
- // Get fTrackHitsPtr
- return fTrackHitsPtr;}
-Int_t AliMUONTrack::GetNTrackHits(void) {
- // Get fNTrackHits
- return fNTrackHits;}
+ //__________________________________________________________________________
+void AliMUONTrack::Clear(Option_t* /*opt*/)
+{
+ /// Clear arrays
+ delete fTrackParamAtCluster; fTrackParamAtCluster = 0x0;
+ delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0;
+ delete fClusterWeightsBending; fClusterWeightsBending = 0x0;
+ delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0;
+}
//__________________________________________________________________________
-void AliMUONTrack::RecursiveDump(void)
+void AliMUONTrack::Reset()
{
- // Recursive dump of AliMUONTrack, i.e. with dump of TrackHit's and HitForRec's
- AliMUONTrackHit *trackHit;
- AliMUONHitForRec *hitForRec;
- cout << "Recursive dump of Track: " << this << endl;
- // Track
- this->Dump();
- for (Int_t trackHitIndex = 0; trackHitIndex < fNTrackHits; trackHitIndex++) {
- trackHit = (AliMUONTrackHit*) ((*fTrackHitsPtr)[trackHitIndex]);
- // TrackHit
- cout << "TrackHit: " << trackHit << " (index: " << trackHitIndex << ")" << endl;
- trackHit->Dump();
- hitForRec = trackHit->GetHitForRecPtr();
- // HitForRec
- cout << "HitForRec: " << hitForRec << endl;
- hitForRec->Dump();
+ /// Reset to default values
+ SetUniqueID(0);
+ fFitWithVertex = kFALSE;
+ fVertexErrXY2[0] = 0.;
+ fVertexErrXY2[1] = 0.;
+ fFitWithMCS = kFALSE;
+ fGlobalChi2 = -1.;
+ fImproved = kFALSE;
+ fMatchTrigger = -1;
+ fChi2MatchTrigger = 0.;
+ fTrackID = -1;
+ fHitsPatternInTrigCh = 0;
+ fHitsPatternInTrigChTrk = 0;
+ fLocalTrigger = 0;
+ fConnected = kFALSE;
+ delete fTrackParamAtCluster; fTrackParamAtCluster = 0x0;
+ delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0;
+ delete fClusterWeightsBending; fClusterWeightsBending = 0x0;
+ delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0;
+}
+
+ //__________________________________________________________________________
+TObjArray* AliMUONTrack::GetTrackParamAtCluster() const
+{
+ /// return array of track parameters at cluster (create it if needed)
+ if (!fTrackParamAtCluster) {
+ fTrackParamAtCluster = new TObjArray(20);
+ fTrackParamAtCluster->SetOwner(kTRUE);
}
- return;
+ return fTrackParamAtCluster;
}
//__________________________________________________________________________
-void AliMUONTrack::Fit(AliMUONTrackParam *TrackParam, Int_t NParam)
+void AliMUONTrack::AddTrackParamAtCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster &cluster, Bool_t copy)
{
- // Fit the current track ("this"),
- // starting with track parameters pointed to by "TrackParam",
- // and with 3 or 5 parameters ("NParam"):
- // 3 if one keeps X and Y fixed in "TrackParam",
- // 5 if one lets them vary.
- if ((NParam != 3) && (NParam != 5)) {
- cout << "ERROR in AliMUONTrack::Fit, NParam = " << NParam;
- cout << " , i.e. neither 3 nor 5 ====> EXIT" << endl;
- exit(0); // right instruction for exit ????
- }
- Int_t error = 0;
- Double_t arg[1], benC, errorParam, invBenP, lower, nonBenC, upper, x, y;
- TString parName;
- TMinuit *minuit = new TMinuit(5);
- trackBeingFitted = this; // for the track to be known from the function to minimize
- trackParamBeingFitted = TrackParam; // for the track parameters to be known from the function to minimize; possible to use only Minuit parameters ????
- // try to use TVirtualFitter to get this feature automatically !!!!
- minuit->mninit(5, 10, 7); // sysrd, syswr, syssa: useful ????
- // how to go faster ???? choice of Minuit parameters like EDM ????
- // choice of function to be minimized according to fFitMCS
- if (fFitMCS == 0) minuit->SetFCN(TrackChi2);
- else minuit->SetFCN(TrackChi2MCS);
- minuit->SetPrintLevel(1); // More printing !!!!
- // set first 3 parameters
- // could be tried with no limits for the search (min=max=0) ????
- minuit->mnparm(0, "InvBenP",
- TrackParam->GetInverseBendingMomentum(),
- 0.003, -0.4, 0.4, error);
- minuit->mnparm(1, "BenS",
- TrackParam->GetBendingSlope(),
- 0.001, -0.5, 0.5, error);
- minuit->mnparm(2, "NonBenS",
- TrackParam->GetNonBendingSlope(),
- 0.001, -0.5, 0.5, error);
- if (NParam == 5) {
- // set last 2 parameters (no limits for the search: min=max=0)
- minuit->mnparm(3, "X",
- TrackParam->GetNonBendingCoor(),
- 0.03, 0.0, 0.0, error);
- minuit->mnparm(4, "Y",
- TrackParam->GetBendingCoor(),
- 0.10, 0.0, 0.0, error);
- }
- // search without gradient calculation in the function
- minuit->mnexcm("SET NOGRADIENT", arg, 0, error);
- // minimization
- minuit->mnexcm("MINIMIZE", arg, 0, error);
- // exit from Minuit
- minuit->mnexcm("EXIT", arg, 0, error); // necessary ????
- // print results
- minuit->mnpout(0, parName, invBenP, errorParam, lower, upper, error);
- minuit->mnpout(1, parName, benC, errorParam, lower, upper, error);
- minuit->mnpout(2, parName, nonBenC, errorParam, lower, upper, error);
- if (NParam == 5) {
- minuit->mnpout(3, parName, x, errorParam, lower, upper, error);
- minuit->mnpout(4, parName, y, errorParam, lower, upper, error);
- }
- // result of the fit into track parameters
- TrackParam->SetInverseBendingMomentum(invBenP);
- TrackParam->SetBendingSlope(benC);
- TrackParam->SetNonBendingSlope(nonBenC);
- if (NParam == 5) {
- TrackParam->SetNonBendingCoor(x);
- TrackParam->SetBendingCoor(y);
- }
- trackBeingFitted = NULL;
- delete minuit;
+ /// Copy given track parameters into a new TrackParamAtCluster
+ /// Link parameters with the associated cluster
+ /// If copy=kTRUE: the cluster is copied then passed the trackParam which become its owner
+ /// otherwise: make sure to do not delete the cluster until it is used by the track
+
+ // check chamber ID of the associated cluster
+ if (cluster.GetChamberId() < 0 || cluster.GetChamberId() > AliMUONConstants::NTrackingCh()) {
+ AliError(Form("Chamber ID of the associated cluster is not valid (ChamberId=%d)",cluster.GetChamberId()));
+ return;
+ }
+
+ // check whether track parameters are given at the correct cluster z position
+ if (TMath::Abs(cluster.GetZ() - trackParam.GetZ())>1.e-5) { // AU
+ AliError("track parameters are given at a different z position than the one of the associated cluster");
+ return;
+ }
+
+ // add parameters to the array of track parameters
+ if (!fTrackParamAtCluster) {
+ fTrackParamAtCluster = new TObjArray(20);
+ fTrackParamAtCluster->SetOwner(kTRUE);
+ }
+ AliMUONTrackParam* trackParamAtCluster = new AliMUONTrackParam(trackParam);
+ fTrackParamAtCluster->AddLast(trackParamAtCluster);
+
+ // link parameters with the associated cluster or its copy
+ if (copy) {
+ AliMUONVCluster *clusterCopy = static_cast<AliMUONVCluster*>(cluster.Clone());
+ trackParamAtCluster->SetClusterPtr(clusterCopy, kTRUE);
+ } else trackParamAtCluster->SetClusterPtr(&cluster);
+
+ // sort the array of track parameters
+ fTrackParamAtCluster->Sort();
}
//__________________________________________________________________________
-void AliMUONTrack::AddSegment(AliMUONSegment* Segment)
+void AliMUONTrack::RemoveTrackParamAtCluster(AliMUONTrackParam *trackParam)
{
- // Add Segment
- AddHitForRec(Segment->GetHitForRec1()); // 1st hit
- AddHitForRec(Segment->GetHitForRec2()); // 2nd hit
+ /// Remove trackParam from the array of TrackParamAtCluster and delete it since the array is owner
+
+ if (fTrackParamAtCluster) {
+
+ AliMUONTrackParam* trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->Remove(trackParam));
+
+ if (trackParamAtCluster) {
+
+ // clean memory
+ delete trackParamAtCluster;
+
+ // remove hole
+ fTrackParamAtCluster->Compress();
+
+ } else AliWarning("object to remove does not exist in array fTrackParamAtCluster");
+
+ } else AliWarning("array fTrackParamAtCluster does not exist");
+
}
//__________________________________________________________________________
-void AliMUONTrack::AddHitForRec(AliMUONHitForRec* HitForRec)
+Bool_t AliMUONTrack::UpdateTrackParamAtCluster()
{
- // Add HitForRec
- new ((*fTrackHitsPtr)[fNTrackHits]) AliMUONTrackHit(HitForRec);
- fNTrackHits++;
+ /// Update track parameters at each attached cluster
+ /// Return kFALSE in case of failure (i.e. extrapolation problem)
+
+ Int_t nClusters = GetNClusters();
+ if (nClusters == 0) {
+ AliWarning("no cluster attached to the track");
+ return kFALSE;
+ }
+
+ Bool_t extrapStatus = kTRUE;
+ AliMUONTrackParam* startingTrackParam = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(0));
+
+ for (Int_t i = 1; i < nClusters; i++) {
+ AliMUONTrackParam* trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(i));
+
+ // reset track parameters and their covariances
+ trackParamAtCluster->SetParameters(startingTrackParam->GetParameters());
+ trackParamAtCluster->SetZ(startingTrackParam->GetZ());
+
+ // extrapolation to the given z
+ if (!AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE;
+
+ // prepare next step
+ startingTrackParam = trackParamAtCluster;
+ }
+
+ // set global chi2 to max value in case of problem during track extrapolation
+ if (!extrapStatus) SetGlobalChi2(2.*MaxChi2());
+ return extrapStatus;
+
}
//__________________________________________________________________________
-void AliMUONTrack::SetTrackParamAtHit(Int_t indexHit, AliMUONTrackParam *TrackParam)
+Bool_t AliMUONTrack::UpdateCovTrackParamAtCluster()
{
- // Set track parameters at TrackHit with index "indexHit"
- // from the track parameters pointed to by "TrackParam".
- AliMUONTrackHit* trackHit = (AliMUONTrackHit*) ((*fTrackHitsPtr)[indexHit]);
- trackHit->SetTrackParam(TrackParam);
+ /// Update track parameters and their covariances at each attached cluster
+ /// Include effects of multiple scattering in chambers
+ /// Return kFALSE in case of failure (i.e. extrapolation problem)
+
+ Int_t nClusters = GetNClusters();
+ if (nClusters == 0) {
+ AliWarning("no cluster attached to the track");
+ return kFALSE;
+ }
+
+ Bool_t extrapStatus = kTRUE;
+ AliMUONTrackParam* startingTrackParam = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(0));
+ Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() + 1;
+ Int_t currentChamber;
+
+ for (Int_t i = 1; i < nClusters; i++) {
+ AliMUONTrackParam* trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(i));
+
+ // reset track parameters and their covariances
+ trackParamAtCluster->SetParameters(startingTrackParam->GetParameters());
+ trackParamAtCluster->SetZ(startingTrackParam->GetZ());
+ trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances());
+
+ // add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber-1),-1.);
+
+ // add MCS in missing chambers if any
+ currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
+ while (currentChamber > expectedChamber) {
+ // extrapolation to the missing chamber
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber))) extrapStatus = kFALSE;
+ // add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.);
+ expectedChamber++;
+ }
+
+ // extrapolation to the z of the current cluster
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE;
+
+ // prepare next step
+ expectedChamber = currentChamber + 1;
+ startingTrackParam = trackParamAtCluster;
+ }
+
+ // set global chi2 to max value in case of problem during track extrapolation
+ if (!extrapStatus) SetGlobalChi2(2.*MaxChi2());
+ return extrapStatus;
+
}
//__________________________________________________________________________
-void AliMUONTrack::SetTrackParamAtVertex()
+Bool_t AliMUONTrack::IsValid(UInt_t requestedStationMask, Bool_t request2ChInSameSt45)
{
- // 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 *trackParam =
- &fTrackParamAtVertex; // pointer to track parameters
- // Pointer to HitForRec of first TrackHit
- AliMUONHitForRec *firstHit =
- ((AliMUONTrackHit*) (fTrackHitsPtr->First()))->GetHitForRecPtr();
- // Pointer to HitForRec of last TrackHit
- AliMUONHitForRec *lastHit =
- ((AliMUONTrackHit*) (fTrackHitsPtr->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;
- trackParam->SetBendingSlope(bendingSlope);
- // impact parameter
- Double_t impactParam =
- firstHit->GetBendingCoor() - bendingSlope * firstHit->GetZ(); // same if from firstHit and lastHit ????
- // signed bending momentum
- Double_t signedBendingMomentum =
- fEventReconstructor->GetBendingMomentumFromImpactParam(impactParam);
- trackParam->SetInverseBendingMomentum(1.0 / signedBendingMomentum);
- // bending slope at vertex
- trackParam->
- SetBendingSlope(bendingSlope +
- impactParam / fEventReconstructor->GetSimpleBPosition());
- // non bending slope
- Double_t nonBendingSlope =
- (firstHit->GetNonBendingCoor() - lastHit->GetNonBendingCoor()) / deltaZ;
- trackParam->SetNonBendingSlope(nonBendingSlope);
- // vertex coordinates at (0,0,0)
- trackParam->SetZ(0.0);
- trackParam->SetBendingCoor(0.0);
- trackParam->SetNonBendingCoor(0.0);
+ /// check the validity of the current track:
+ /// at least one cluster per requested station
+ /// and at least 2 chambers in stations 4 & 5 that contain cluster(s)
+ /// + if request2ChInSameSt45 = kTRUE: 2 chambers hit in the same station (4 or 5)
+
+ Int_t nClusters = GetNClusters();
+ AliMUONTrackParam *trackParam;
+ Int_t currentCh, currentSt, previousCh = -1, nChHitInSt4 = 0, nChHitInSt5 = 0;
+ UInt_t presentStationMask(0);
+
+ // first loop over clusters
+ for (Int_t i = 0; i < nClusters; i++) {
+ trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
+
+ currentCh = trackParam->GetClusterPtr()->GetChamberId();
+ currentSt = currentCh/2;
+
+ // build present station mask
+ presentStationMask |= ( 1 << currentSt );
+
+ // count the number of chambers hit in station 4 that contain cluster(s)
+ if (currentSt == 3 && currentCh != previousCh) {
+ nChHitInSt4++;
+ previousCh = currentCh;
+ }
+
+ // count the number of chambers hit in station 5 that contain cluster(s)
+ if (currentSt == 4 && currentCh != previousCh) {
+ nChHitInSt5++;
+ previousCh = currentCh;
+ }
+
+ }
+
+ // at least one cluster per requested station
+ if ((requestedStationMask & presentStationMask) != requestedStationMask) return kFALSE;
+
+ // 2 chambers hit in the same station (4 or 5)
+ if (request2ChInSameSt45) return (nChHitInSt4 == 2 || nChHitInSt5 == 2);
+ // or 2 chambers hit in station 4 & 5 together
+ else return (nChHitInSt4+nChHitInSt5 >= 2);
+
+}
+
+ //__________________________________________________________________________
+void AliMUONTrack::TagRemovableClusters(UInt_t requestedStationMask) {
+ /// Identify clusters that can be removed from the track,
+ /// with the only requirements to have at least 1 cluster per requested station
+ /// and at least 2 chambers over 4 in stations 4 & 5 that contain cluster(s)
+
+ Int_t nClusters = GetNClusters();
+ AliMUONTrackParam *trackParam, *nextTrackParam;
+ Int_t currentCh, nextCh, currentSt, nextSt, previousCh = -1, nChHitInSt45 = 0;
+
+ // first loop over clusters
+ for (Int_t i = 0; i < nClusters; i++) {
+ trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
+
+ currentCh = trackParam->GetClusterPtr()->GetChamberId();
+ currentSt = currentCh/2;
+
+ // reset flags to kFALSE for all clusters in required station
+ if ((1 << currentSt) & requestedStationMask) trackParam->SetRemovable(kFALSE);
+ else trackParam->SetRemovable(kTRUE);
+
+ // count the number of chambers in station 4 & 5 that contain cluster(s)
+ if (currentCh > 5 && currentCh != previousCh) {
+ nChHitInSt45++;
+ previousCh = currentCh;
+ }
+
+ }
+
+ // second loop over clusters
+ for (Int_t i = 0; i < nClusters; i++) {
+ trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
+
+ currentCh = trackParam->GetClusterPtr()->GetChamberId();
+ currentSt = currentCh/2;
+
+ // make sure they are more than 2 clusters in 2 different chambers of stations 4 & 5
+ // but 2 clusters in he same chamber will still be flagged as removable
+ if (nChHitInSt45 < 3 && currentSt > 2) {
+
+ if (i == nClusters-1) {
+
+ trackParam->SetRemovable(kFALSE);
+
+ } else {
+
+ nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i+1);
+ nextCh = nextTrackParam->GetClusterPtr()->GetChamberId();
+
+ // set clusters in the same chamber as being removable
+ if (nextCh == currentCh) {
+ trackParam->SetRemovable(kTRUE);
+ nextTrackParam->SetRemovable(kTRUE);
+ i++; // skip cluster already checked
+ } else {
+ trackParam->SetRemovable(kFALSE);
+ }
+
+ }
+
+ } else {
+
+ // skip clusters already flag as removable
+ if (trackParam->IsRemovable()) continue;
+
+ // loop over next track parameters
+ for (Int_t j = i+1; j < nClusters; j++) {
+ nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(j);
+
+ nextCh = nextTrackParam->GetClusterPtr()->GetChamberId();
+ nextSt = nextCh/2;
+
+ // set clusters in the same station as being removable
+ if (nextSt == currentSt) {
+ trackParam->SetRemovable(kTRUE);
+ nextTrackParam->SetRemovable(kTRUE);
+ i++; // skip cluster already checked
+ }
+
+ }
+
+ }
+
+ }
+
}
//__________________________________________________________________________
-void TrackChi2(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag)
+Bool_t AliMUONTrack::ComputeLocalChi2(Bool_t accountForMCS)
{
- // Return the "Chi2" to be minimized with Minuit for track fitting,
- // with "NParam" parameters
- // and their current values in array pointed to by "Param".
- // 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
- AliMUONTrackHit* hit;
- AliMUONTrackParam param1;
- Int_t hitNumber;
- Double_t zHit;
- Chi2 = 0.0; // initialize Chi2
- // copy of track parameters to be fitted
- param1 = *trackParamBeingFitted;
- // 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]);
- }
- // Follow track through all planes of track hits
- for (hitNumber = 0; hitNumber < trackBeingFitted->GetNTrackHits(); hitNumber++) {
- hit = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber];
- zHit = hit->GetHitForRecPtr()->GetZ();
- // do something special if 2 hits with same Z ????
- // security against infinite loop ????
- (¶m1)->ExtrapToZ(zHit); // extrapolation
- hit->SetTrackParam(¶m1);
- // 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 =
- hit->GetHitForRecPtr()->GetNonBendingCoor() - (¶m1)->GetNonBendingCoor();
- Double_t dY =
- hit->GetHitForRecPtr()->GetBendingCoor() - (¶m1)->GetBendingCoor();
- Chi2 =
- Chi2 +
- dX * dX / hit->GetHitForRecPtr()->GetNonBendingReso2() +
- dY * dY / hit->GetHitForRecPtr()->GetBendingReso2();
+ /// Compute each cluster contribution to the chi2 of the track
+ /// accounting for multiple scattering or not according to the flag
+ /// - Also recompute the weight matrices of the attached clusters if accountForMCS=kTRUE
+ /// - Assume that track parameters at each cluster are corrects
+ /// - Return kFALSE if computation failed
+ AliDebug(1,"Enter ComputeLocalChi2");
+
+ if (!fTrackParamAtCluster) {
+ AliWarning("no cluster attached to this track");
+ return kFALSE;
+ }
+
+ if (accountForMCS) { // Compute local chi2 taking into account multiple scattering effects
+
+ // Compute MCS covariance matrix only once
+ Int_t nClusters = GetNClusters();
+ TMatrixD mcsCovariances(nClusters,nClusters);
+ ComputeMCSCovariances(mcsCovariances);
+
+ // Make sure cluster weights are consistent with following calculations
+ if (!ComputeClusterWeights(&mcsCovariances)) {
+ AliWarning("cannot take into account the multiple scattering effects");
+ return ComputeLocalChi2(kFALSE);
+ }
+
+ // Compute chi2 of the track
+ Double_t globalChi2 = ComputeGlobalChi2(kTRUE);
+ if (globalChi2 < 0.) return kFALSE;
+
+ // Loop over removable clusters and compute their local chi2
+ AliMUONTrackParam* trackParamAtCluster;
+ AliMUONTrackParam* trackParamAtCluster1;
+ AliMUONVCluster *cluster, *discardedCluster;
+ Int_t iCluster1, iCluster2, iCurrentCluster1, iCurrentCluster2;
+ TMatrixD clusterWeightsNB(nClusters-1,nClusters-1);
+ TMatrixD clusterWeightsB(nClusters-1,nClusters-1);
+ Double_t *dX = new Double_t[nClusters-1];
+ Double_t *dY = new Double_t[nClusters-1];
+ Double_t globalChi2b;
+ for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) {
+ trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(iCluster));
+
+ discardedCluster = trackParamAtCluster->GetClusterPtr();
+
+ // Recompute cluster weights without the current cluster
+ if (!ComputeClusterWeights(clusterWeightsNB, clusterWeightsB, &mcsCovariances, discardedCluster)) {
+ AliWarning("cannot take into account the multiple scattering effects");
+ delete [] dX;
+ delete [] dY;
+ return ComputeLocalChi2(kFALSE);
+ }
+
+ // Compute track chi2 without the current cluster
+ globalChi2b = 0.;
+ iCurrentCluster1 = 0;
+ for (iCluster1 = 0; iCluster1 < nClusters ; iCluster1++) {
+ trackParamAtCluster1 = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1);
+ cluster = trackParamAtCluster1->GetClusterPtr();
+
+ if (cluster == discardedCluster) continue;
+
+ // Compute and save residuals
+ dX[iCurrentCluster1] = cluster->GetX() - trackParamAtCluster1->GetNonBendingCoor();
+ dY[iCurrentCluster1] = cluster->GetY() - trackParamAtCluster1->GetBendingCoor();
+
+ iCurrentCluster2 = 0;
+ for (iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) {
+ cluster = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr();
+
+ if (cluster == discardedCluster) continue;
+
+ // Add contribution from covariances
+ globalChi2b += (clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) +
+ clusterWeightsNB(iCurrentCluster2, iCurrentCluster1)) * dX[iCurrentCluster1] * dX[iCurrentCluster2] +
+ (clusterWeightsB(iCurrentCluster1, iCurrentCluster2) +
+ clusterWeightsB(iCurrentCluster2, iCurrentCluster1)) * dY[iCurrentCluster1] * dY[iCurrentCluster2];
+
+ iCurrentCluster2++;
+ }
+
+ // Add contribution from variances
+ globalChi2b += clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) * dX[iCurrentCluster1] * dX[iCurrentCluster1] +
+ clusterWeightsB(iCurrentCluster1, iCurrentCluster1) * dY[iCurrentCluster1] * dY[iCurrentCluster1];
+
+ iCurrentCluster1++;
+ }
+
+ // Set local chi2
+ trackParamAtCluster->SetLocalChi2(globalChi2 - globalChi2b);
+ }
+
+ delete [] dX;
+ delete [] dY;
+
+ } else { // without multiple scattering effects
+
+ Int_t nClusters = GetNClusters();
+ AliMUONTrackParam* trackParamAtCluster;
+ AliMUONVCluster *discardedCluster;
+ Double_t dX, dY;
+ for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) {
+ trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(iCluster));
+
+ discardedCluster = trackParamAtCluster->GetClusterPtr();
+
+ // Compute residuals
+ dX = discardedCluster->GetX() - trackParamAtCluster->GetNonBendingCoor();
+ dY = discardedCluster->GetY() - trackParamAtCluster->GetBendingCoor();
+
+ // Set local chi2
+ trackParamAtCluster->SetLocalChi2(dX * dX / discardedCluster->GetErrX2() + dY * dY / discardedCluster->GetErrY2());
+ }
+
}
+
+ return kTRUE;
+
}
//__________________________________________________________________________
-void TrackChi2MCS(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag)
+Double_t AliMUONTrack::ComputeGlobalChi2(Bool_t accountForMCS)
{
- // Return the "Chi2" to be minimized with Minuit for track fitting,
- // with "NParam" parameters
- // and their current values in array pointed to by "Param".
- // 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.
- AliMUONTrackParam param1;
- Chi2 = 0.0; // initialize Chi2
- // copy of track parameters to be fitted
- param1 = *trackParamBeingFitted;
- // 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]);
- }
-
- AliMUONTrackHit* hit, hit1, hit2, hit3;
- Bool_t GoodDeterminant;
- Int_t hitNumber, hitNumber1, hitNumber2, hitNumber3;
- Double_t zHit[10], paramBendingCoor[10], paramNonBendingCoor[10], ap[10];
- Double_t hitBendingCoor[10], hitNonBendingCoor[10];
- Double_t hitBendingReso2[10], hitNonBendingReso2[10];
- Int_t numberOfHit = TMath::Min(trackBeingFitted->GetNTrackHits(), 10);
- TMatrix *covBending = new TMatrix(numberOfHit, numberOfHit);
- TMatrix *covNonBending = new TMatrix(numberOfHit, numberOfHit);
-
- // Predicted coordinates and multiple scattering angles are first calculated
- for (hitNumber = 0; hitNumber < numberOfHit; hitNumber++) {
- hit = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber];
- zHit[hitNumber] = hit->GetHitForRecPtr()->GetZ();
- // do something special if 2 hits with same Z ????
- // security against infinite loop ????
- (¶m1)->ExtrapToZ(zHit[hitNumber]); // extrapolation
- hit->SetTrackParam(¶m1);
- paramBendingCoor[hitNumber]= (¶m1)->GetBendingCoor();
- paramNonBendingCoor[hitNumber]= (¶m1)->GetNonBendingCoor();
- hitBendingCoor[hitNumber]= hit->GetHitForRecPtr()->GetBendingCoor();
- hitNonBendingCoor[hitNumber]= hit->GetHitForRecPtr()->GetNonBendingCoor();
- hitBendingReso2[hitNumber]= hit->GetHitForRecPtr()->GetBendingReso2();
- hitNonBendingReso2[hitNumber]= hit->GetHitForRecPtr()->GetNonBendingReso2();
- ap[hitNumber] = MultipleScatteringAngle2(hit); // multiple scatt. angle ^2
- }
-
- // Calculates the covariance matrix
- for (hitNumber1 = 0; hitNumber1 < numberOfHit; hitNumber1++) {
- for (hitNumber2 = hitNumber1; hitNumber2 < numberOfHit; hitNumber2++) {
- (*covBending)(hitNumber1, hitNumber2) = 0;
- (*covBending)(hitNumber2, hitNumber1) = 0;
- if (hitNumber1 == hitNumber2){ // diagonal elements
- (*covBending)(hitNumber2, hitNumber1) =
- (*covBending)(hitNumber2, hitNumber1) + hitBendingReso2[hitNumber1];
+ /// Compute the chi2 of the track accounting for multiple scattering or not according to the flag
+ /// - Assume that track parameters at each cluster are corrects
+ /// - Assume the cluster weights matrices are corrects
+ /// - Return a value of chi2 higher than the maximum allowed if computation failed
+ AliDebug(1,"Enter ComputeGlobalChi2");
+
+ if (!fTrackParamAtCluster) {
+ AliWarning("no cluster attached to this track");
+ return 2.*MaxChi2();
+ }
+
+ Double_t chi2 = 0.;
+
+ if (accountForMCS) {
+
+ // Check the weight matrices. If weight matrices are not available compute chi2 without MCS
+ if (!fClusterWeightsNonBending || !fClusterWeightsBending) {
+ AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering");
+ return ComputeGlobalChi2(kFALSE);
+ }
+ Int_t nClusters = GetNClusters();
+ if (fClusterWeightsNonBending->GetNrows() != nClusters || fClusterWeightsBending->GetNcols() != nClusters) {
+ AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering");
+ return ComputeGlobalChi2(kFALSE);
+ }
+
+ // Compute chi2
+ AliMUONVCluster *cluster;
+ Double_t *dX = new Double_t[nClusters];
+ Double_t *dY = new Double_t[nClusters];
+ AliMUONTrackParam* trackParamAtCluster;
+ for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) {
+ trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1);
+ cluster = trackParamAtCluster->GetClusterPtr();
+ dX[iCluster1] = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor();
+ dY[iCluster1] = cluster->GetY() - trackParamAtCluster->GetBendingCoor();
+ for (Int_t iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) {
+ chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster2) + (*fClusterWeightsNonBending)(iCluster2, iCluster1)) * dX[iCluster1] * dX[iCluster2] +
+ ((*fClusterWeightsBending)(iCluster1, iCluster2) + (*fClusterWeightsBending)(iCluster2, iCluster1)) * dY[iCluster1] * dY[iCluster2];
}
- // Multiple Scattering... loop on upstream chambers ??
- for (hitNumber3 = 0; hitNumber3 < hitNumber1; hitNumber3++){
- (*covBending)(hitNumber2, hitNumber1) =
- (*covBending)(hitNumber2, hitNumber1) +
- ((zHit[hitNumber1] - zHit[hitNumber3]) *
- (zHit[hitNumber2] - zHit[hitNumber3]) * ap[hitNumber3]);
- }
- (*covNonBending)(hitNumber1, hitNumber2) = 0;
- (*covNonBending)(hitNumber2, hitNumber1) =
- (*covBending)(hitNumber2, hitNumber1);
- if (hitNumber1 == hitNumber2) { // diagonal elements
- (*covNonBending)(hitNumber2, hitNumber1) =
- (*covNonBending)(hitNumber2, hitNumber1) -
- hitBendingReso2[hitNumber1] + hitNonBendingReso2[hitNumber1] ;
- }
+ chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster1) * dX[iCluster1] * dX[iCluster1]) +
+ ((*fClusterWeightsBending)(iCluster1, iCluster1) * dY[iCluster1] * dY[iCluster1]);
+ }
+ delete [] dX;
+ delete [] dY;
+
+ } else {
+
+ AliMUONVCluster *cluster;
+ Double_t dX, dY;
+ AliMUONTrackParam* trackParamAtCluster;
+ Int_t nClusters = GetNClusters();
+ for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) {
+ trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster);
+ cluster = trackParamAtCluster->GetClusterPtr();
+ dX = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor();
+ dY = cluster->GetY() - trackParamAtCluster->GetBendingCoor();
+ chi2 += dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2();
}
+
}
+
+ return chi2;
+
+}
- // Inverts covariance matrix
- GoodDeterminant = kTRUE;
- if (covBending->Determinant() != 0) {
- covBending->Invert();
+ //__________________________________________________________________________
+Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD* mcsCovariances)
+{
+ /// Compute the weight matrices of the attached clusters, in non bending and bending direction,
+ /// accounting for multiple scattering correlations and cluster resolution
+ /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily)
+ /// - Assume that track parameters at each cluster are corrects
+ /// - Return kFALSE if computation failed
+ AliDebug(1,"Enter ComputeClusterWeights1");
+
+ if (!fTrackParamAtCluster) {
+ AliWarning("no cluster attached to this track");
+ return kFALSE;
+ }
+
+ // Alocate memory
+ Int_t nClusters = GetNClusters();
+ if (!fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(nClusters,nClusters);
+ if (!fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(nClusters,nClusters);
+
+ // Compute weights matrices
+ if (!ComputeClusterWeights(*fClusterWeightsNonBending, *fClusterWeightsBending, mcsCovariances)) return kFALSE;
+
+ return kTRUE;
+
+}
+
+ //__________________________________________________________________________
+Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD& clusterWeightsNB, TMatrixD& clusterWeightsB,
+ TMatrixD* mcsCovariances, const AliMUONVCluster* discardedCluster) const
+{
+ /// Compute the weight matrices, in non bending and bending direction,
+ /// of the other attached clusters assuming the discarded one does not exist
+ /// accounting for multiple scattering correlations and cluster resolution
+ /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily)
+ /// - Return kFALSE if computation failed
+ AliDebug(1,"Enter ComputeClusterWeights2");
+
+ // Check MCS covariance matrix and recompute it if need
+ Int_t nClusters = GetNClusters();
+ Bool_t deleteMCSCov = kFALSE;
+ if (!mcsCovariances) {
+ mcsCovariances = new TMatrixD(nClusters,nClusters);
+ deleteMCSCov = kTRUE;
+ ComputeMCSCovariances(*mcsCovariances);
+ }
+
+ // Resize the weights matrices; alocate memory
+ if (discardedCluster) {
+ clusterWeightsNB.ResizeTo(nClusters-1,nClusters-1);
+ clusterWeightsB.ResizeTo(nClusters-1,nClusters-1);
} else {
- GoodDeterminant = kFALSE;
- cout << "Warning in ChiMCS Determinant Bending=0: " << endl;
+ clusterWeightsNB.ResizeTo(nClusters,nClusters);
+ clusterWeightsB.ResizeTo(nClusters,nClusters);
+ }
+
+ // Define variables
+ AliMUONVCluster *cluster1, *cluster2;
+ Int_t iCurrentCluster1, iCurrentCluster2;
+
+ // Compute the covariance matrices
+ iCurrentCluster1 = 0;
+ for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) {
+ cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr();
+
+ if (cluster1 == discardedCluster) continue;
+
+ // Loop over next clusters
+ iCurrentCluster2 = iCurrentCluster1;
+ for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) {
+ cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr();
+
+ if (cluster2 == discardedCluster) continue;
+
+ // Fill with MCS covariances
+ clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) = (*mcsCovariances)(iCluster1,iCluster2);
+
+ // Equal contribution from multiple scattering in non bending and bending directions
+ clusterWeightsB(iCurrentCluster1, iCurrentCluster2) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2);
+
+ // Add contribution from cluster resolution to diagonal element and symmetrize the matrix
+ if (iCurrentCluster1 == iCurrentCluster2) {
+
+ // In non bending plane
+ clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrX2();
+ // In bending plane
+ clusterWeightsB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrY2();
+
+ } else {
+
+ // In non bending plane
+ clusterWeightsNB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2);
+ // In bending plane
+ clusterWeightsB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsB(iCurrentCluster1, iCurrentCluster2);
+
+ }
+
+ iCurrentCluster2++;
+ }
+
+ iCurrentCluster1++;
}
- if (covNonBending->Determinant() != 0){
- covNonBending->Invert();
+
+ // Inversion of covariance matrices to get the weights
+ if (clusterWeightsNB.Determinant() != 0 && clusterWeightsB.Determinant() != 0) {
+ clusterWeightsNB.Invert();
+ clusterWeightsB.Invert();
} else {
- GoodDeterminant = kFALSE;
- cout << "Warning in ChiMCS Determinant non Bending=0: " << endl;
- }
-
- // Calculates Chi2
- if (GoodDeterminant) { // with Multiple Scattering if inversion correct
- for (hitNumber1=0; hitNumber1 < numberOfHit ; hitNumber1++){
- for (hitNumber2=0; hitNumber2 < numberOfHit; hitNumber2++){
- Chi2 = Chi2 +
- ((*covBending)(hitNumber2, hitNumber1) *
- (hitBendingCoor[hitNumber1] - paramBendingCoor[hitNumber1]) *
- (hitBendingCoor[hitNumber2] - paramBendingCoor[hitNumber2]));
- Chi2 = Chi2 +
- ((*covNonBending)(hitNumber2, hitNumber1) *
- (hitNonBendingCoor[hitNumber1] - paramNonBendingCoor[hitNumber1]) *
- (hitNonBendingCoor[hitNumber2] - paramNonBendingCoor[hitNumber2]));
+ AliWarning(" Determinant = 0");
+ clusterWeightsNB.ResizeTo(0,0);
+ clusterWeightsB.ResizeTo(0,0);
+ if(deleteMCSCov) delete mcsCovariances;
+ return kFALSE;
+ }
+
+ if(deleteMCSCov) delete mcsCovariances;
+
+ return kTRUE;
+
+}
+
+ //__________________________________________________________________________
+void AliMUONTrack::ComputeMCSCovariances(TMatrixD& mcsCovariances) const
+{
+ /// Compute the multiple scattering covariance matrix
+ /// (assume that track parameters at each cluster are corrects)
+ AliDebug(1,"Enter ComputeMCSCovariances");
+
+ // Reset the size of the covariance matrix if needed
+ Int_t nClusters = GetNClusters();
+ if (mcsCovariances.GetNrows() != nClusters) mcsCovariances.ResizeTo(nClusters,nClusters);
+
+ // Define variables
+ Int_t nChambers = AliMUONConstants::NTrackingCh();
+ AliMUONTrackParam* trackParamAtCluster;
+ AliMUONTrackParam extrapTrackParam;
+ Int_t currentChamber = 0, expectedChamber = 0, size = 0;
+ Double_t *mcsAngle2 = new Double_t[2*nChambers];
+ Double_t *zMCS = new Double_t[2*nChambers];
+ Int_t *indices = new Int_t[2*nClusters];
+
+ // Compute multiple scattering dispersion angle at each chamber
+ // and save the z position where it is calculated
+ for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
+ trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster);
+
+ // look for missing chambers if any
+ currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
+ while (currentChamber > expectedChamber) {
+
+ // Save the z position where MCS dispersion is calculated
+ zMCS[size] = AliMUONConstants::DefaultChamberZ(expectedChamber);
+
+ // Do not take into account MCS in chambers prior the first cluster
+ if (iCluster > 0) {
+
+ // Get track parameters at missing chamber z
+ extrapTrackParam = *trackParamAtCluster;
+ AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, zMCS[size]);
+
+ // Save multiple scattering dispersion angle in missing chamber
+ mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(expectedChamber),1.);
+
+ } else mcsAngle2[size] = 0.;
+
+ expectedChamber++;
+ size++;
+ }
+
+ // Save z position where MCS dispersion is calculated
+ zMCS[size] = trackParamAtCluster->GetZ();
+
+ // Save multiple scattering dispersion angle in current chamber
+ mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(*trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(currentChamber),1.);
+
+ // Save indice in zMCS array corresponding to the current cluster
+ indices[iCluster] = size;
+
+ expectedChamber = currentChamber + 1;
+ size++;
+ }
+
+ // complete array of z if last cluster is on the last but one chamber
+ if (currentChamber != nChambers-1) zMCS[size++] = AliMUONConstants::DefaultChamberZ(nChambers-1);
+
+ // Compute the covariance matrix
+ for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) {
+
+ for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) {
+
+ // Initialization to 0 (diagonal plus upper triangular part)
+ mcsCovariances(iCluster1,iCluster2) = 0.;
+
+ // Compute contribution from multiple scattering in upstream chambers
+ for (Int_t k = 0; k < indices[iCluster1]; k++) {
+ mcsCovariances(iCluster1,iCluster2) += (zMCS[indices[iCluster1]] - zMCS[k]) * (zMCS[indices[iCluster2]] - zMCS[k]) * mcsAngle2[k];
}
+
+ // Symetrize the matrix
+ mcsCovariances(iCluster2,iCluster1) = mcsCovariances(iCluster1,iCluster2);
}
- } else { // without Multiple Scattering if inversion impossible
- for (hitNumber1=0; hitNumber1 < numberOfHit ; hitNumber1++) {
- Chi2 = Chi2 +
- ((hitBendingCoor[hitNumber1] - paramBendingCoor[hitNumber1]) *
- (hitBendingCoor[hitNumber1] - paramBendingCoor[hitNumber1]) /
- hitBendingReso2[hitNumber1]);
- Chi2 = Chi2 +
- ((hitNonBendingCoor[hitNumber1] - paramNonBendingCoor[hitNumber1]) *
- (hitNonBendingCoor[hitNumber1] - paramNonBendingCoor[hitNumber1]) /
- hitNonBendingReso2[hitNumber1]);
+
+ }
+
+ delete [] mcsAngle2;
+ delete [] zMCS;
+ delete [] indices;
+
+}
+
+ //__________________________________________________________________________
+Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track, Int_t stMin, Int_t stMax) const
+{
+ /// Returns the number of clusters in common in stations [stMin, stMax]
+ /// between the current track ("this") and the track pointed to by "track".
+
+ if (!track || !track->fTrackParamAtCluster || !this->fTrackParamAtCluster) return 0;
+
+ Int_t chMin = 2 * stMin;
+ Int_t chMax = 2 * stMax + 1;
+ Int_t clustersInCommon = 0;
+
+ // Loop over clusters of first track
+ Int_t nCl1 = this->GetNClusters();
+ for(Int_t iCl1 = 0; iCl1 < nCl1; iCl1++) {
+ AliMUONVCluster* cl1 = ((AliMUONTrackParam*) this->fTrackParamAtCluster->UncheckedAt(iCl1))->GetClusterPtr();
+
+ Int_t chCl1 = cl1->GetChamberId();
+ if (chCl1 < chMin || chCl1 > chMax) continue;
+
+ // Loop over clusters of second track
+ Int_t nCl2 = track->GetNClusters();
+ for(Int_t iCl2 = 0; iCl2 < nCl2; iCl2++) {
+ AliMUONVCluster* cl2 = ((AliMUONTrackParam*) track->fTrackParamAtCluster->UncheckedAt(iCl2))->GetClusterPtr();
+
+ Int_t chCl2 = cl2->GetChamberId();
+ if (chCl2 < chMin || chCl2 > chMax) continue;
+
+ // Increment "clustersInCommon" if both clusters have the same ID
+ if (cl1->GetUniqueID() == cl2->GetUniqueID()) {
+ clustersInCommon++;
+ break;
+ }
+
}
+
}
- delete covBending;
- delete covNonBending;
+ return clustersInCommon;
}
-Double_t MultipleScatteringAngle2(AliMUONTrackHit *TrackHit)
+ //__________________________________________________________________________
+Int_t AliMUONTrack::GetNDF() const
{
- // Returns square of multiple Coulomb scattering angle
- // at TrackHit pointed to by "TrackHit"
- Double_t slopeBending, slopeNonBending, radiationLength, inverseBendingMomentum2, inverseTotalMomentum2;
- Double_t varMultipleScatteringAngle;
- AliMUONTrackParam *param = TrackHit->GetTrackParam();
- slopeBending = param->GetBendingSlope();
- slopeNonBending = param->GetNonBendingSlope();
- // thickness in radiation length for the current track,
- // taking local angle into account
- radiationLength =
- trackBeingFitted->GetEventReconstructor()->GetChamberThicknessInX0() *
- TMath::Sqrt(1.0 +
- slopeBending * slopeBending + slopeNonBending * slopeNonBending);
- inverseBendingMomentum2 =
- param->GetInverseBendingMomentum() * param->GetInverseBendingMomentum();
- inverseTotalMomentum2 =
- inverseBendingMomentum2 * (1.0 + slopeBending*slopeBending) /
- (1.0 + slopeBending *slopeBending + slopeNonBending * slopeNonBending);
- varMultipleScatteringAngle = 0.0136 * (1.0 + 0.038 * TMath::Log(radiationLength));
- varMultipleScatteringAngle = inverseTotalMomentum2 * radiationLength *
- varMultipleScatteringAngle * varMultipleScatteringAngle;
- return varMultipleScatteringAngle;
+ /// return the number of degrees of freedom
+
+ Int_t ndf = 2 * GetNClusters() - 5;
+ return (ndf > 0) ? ndf : 0;
}
+
+ //__________________________________________________________________________
+Double_t AliMUONTrack::GetNormalizedChi2() const
+{
+ /// return the chi2 value divided by the number of degrees of freedom (or FLT_MAX if ndf <= 0)
+
+ Double_t ndf = (Double_t) GetNDF();
+ return (ndf > 0.) ? fGlobalChi2 / ndf : 2.*MaxChi2();
+}
+
+ //__________________________________________________________________________
+Int_t AliMUONTrack::FindCompatibleClusters(const AliMUONTrack &track, Double_t sigmaCut, Bool_t compatibleCluster[10]) const
+{
+ /// Try to match clusters from this track with clusters from the given track within the provided sigma cut:
+ /// - Fill the array compatibleCluster[iCh] with kTRUE if a compatible cluster has been found in chamber iCh.
+ /// - Return the number of clusters of "this" track matched with one cluster of the given track.
+ AliMUONVCluster *cluster1, *cluster2;
+ Double_t chi2, dX, dY;
+ Double_t chi2Max = sigmaCut * sigmaCut;
+
+ // initialization
+ Int_t nMatchClusters = 0;
+ for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) compatibleCluster[ch] = kFALSE;
+
+ if (!track.fTrackParamAtCluster || !this->fTrackParamAtCluster) return nMatchClusters;
+
+ // Loop over clusters of first track
+ Int_t nCl1 = this->GetNClusters();
+ for(Int_t iCl1 = 0; iCl1 < nCl1; iCl1++) {
+ cluster1 = static_cast<AliMUONTrackParam*>(this->fTrackParamAtCluster->UncheckedAt(iCl1))->GetClusterPtr();
+
+ // Loop over clusters of second track
+ Int_t nCl2 = track.GetNClusters();
+ for(Int_t iCl2 = 0; iCl2 < nCl2; iCl2++) {
+ cluster2 = static_cast<AliMUONTrackParam*>(track.fTrackParamAtCluster->UncheckedAt(iCl2))->GetClusterPtr();
+
+ // check DE Id
+ if (cluster1->GetDetElemId() != cluster2->GetDetElemId()) continue;
+
+ // check local chi2
+ dX = cluster1->GetX() - cluster2->GetX();
+ dY = cluster1->GetY() - cluster2->GetY();
+ chi2 = dX * dX / (cluster1->GetErrX2() + cluster2->GetErrX2()) + dY * dY / (cluster1->GetErrY2() + cluster2->GetErrY2());
+ if (chi2 > 2. * chi2Max) continue; // 2 because 2 quantities in chi2
+
+ compatibleCluster[cluster1->GetChamberId()] = kTRUE;
+ nMatchClusters++;
+ break;
+ }
+
+ }
+
+ return nMatchClusters;
+}
+
+//__________________________________________________________________________
+Bool_t AliMUONTrack::Match(AliMUONTrack &track, Double_t sigmaCut, Int_t &nMatchClusters) const
+{
+ /// Try to match this track with the given track. Matching conditions:
+ /// - more than 50% of clusters from this track matched with clusters from the given track
+ /// - at least 1 cluster matched before and 1 cluster matched after the dipole
+
+ Bool_t compTrack[10];
+ nMatchClusters = FindCompatibleClusters(track, sigmaCut, compTrack);
+
+ if ((compTrack[0] || compTrack[1] || compTrack[2] || compTrack[3]) && // at least 1 cluster matched in st 1 & 2
+ (compTrack[6] || compTrack[7] || compTrack[8] || compTrack[9]) && // at least 1 cluster matched in st 4 & 5
+ 2 * nMatchClusters > GetNClusters()) return kTRUE; // more than 50% of clusters matched
+ else return kFALSE;
+
+}
+
+//__________________________________________________________________________
+void AliMUONTrack::SetTrackParamAtVertex(const AliMUONTrackParam* trackParam)
+{
+ /// set track parameters at vertex
+ if (trackParam == 0x0) return;
+ if (fTrackParamAtVertex) *fTrackParamAtVertex = *trackParam;
+ else fTrackParamAtVertex = new AliMUONTrackParam(*trackParam);
+}
+
+//__________________________________________________________________________
+void AliMUONTrack::RecursiveDump() const
+{
+ /// Recursive dump of AliMUONTrack, i.e. with dump of trackParamAtCluster and attached clusters
+ AliMUONTrackParam *trackParamAtCluster;
+ AliMUONVCluster *cluster;
+ cout << "Recursive dump of Track: " << this << endl;
+ // Track
+ this->Dump();
+ for (Int_t iCluster = 0; iCluster < GetNClusters(); iCluster++) {
+ trackParamAtCluster = (AliMUONTrackParam*) ((*fTrackParamAtCluster)[iCluster]);
+ // trackParamAtCluster
+ cout << "trackParamAtCluster: " << trackParamAtCluster << " (index: " << iCluster << ")" << endl;
+ trackParamAtCluster->Dump();
+ cluster = trackParamAtCluster->GetClusterPtr();
+ // cluster
+ cout << "cluster: " << cluster << endl;
+ cluster->Print();
+ }
+ return;
+}
+
+//_____________________________________________-
+void AliMUONTrack::Print(Option_t*) const
+{
+ /// Printing Track information
+
+ streamsize curW = cout.width();
+ streamsize curPrecision = cout.precision();
+ cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNClusters() <<
+ ", Match2Trig=" << setw(1) << GetMatchTrigger() <<
+ ", LoTrgNum=" << setw(3) << LoCircuit() <<
+ ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger();
+ cout << Form(" HitTriggerPattern trig %x track %x",fHitsPatternInTrigCh, fHitsPatternInTrigChTrk);
+ cout << Form(" MClabel=%d",fTrackID) << endl;
+ if (fTrackParamAtCluster) fTrackParamAtCluster->First()->Print("FULL");
+ cout.width(curW);
+ cout.precision(curPrecision);
+}
+
+//__________________________________________________________________________
+void AliMUONTrack::SetLocalTrigger(Int_t loCirc, Int_t loStripX, Int_t loStripY, Int_t loDev, Int_t loLpt, Int_t loHpt, UChar_t respWithoutChamber)
+{
+ /// pack the local trigger information and store
+
+ if (loCirc < 0) return;
+
+ fLocalTrigger = 0;
+ fLocalTrigger += loCirc;
+ fLocalTrigger += loStripX << 8;
+ fLocalTrigger += loStripY << 13;
+ fLocalTrigger += loDev << 17;
+ fLocalTrigger += loLpt << 22;
+ fLocalTrigger += loHpt << 24;
+ fLocalTrigger += respWithoutChamber << 26;
+
+}
+
+//__________________________________________________________________________
+void AliMUONTrack::FindMCLabel()
+{
+ /// Determine the MC label from the label of the attached clusters and fill fMCLabel data member:
+ /// More than 50% of clusters, including 1 before and 1 after the dipole, must share the same label
+
+ Int_t nClusters = GetNClusters();
+ Int_t halfCluster = nClusters/2;
+
+ // reset MC label
+ fTrackID = -1;
+
+ // loop over first clusters (if nClusters left < (nClusters-halfCluster) the conditions cannot be fulfilled)
+ for (Int_t iCluster1 = 0; iCluster1 < nClusters-halfCluster; iCluster1++) {
+ AliMUONVCluster* cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr();
+
+ // if the first cluster is not on station 1 or 2 the conditions cannot be fulfilled
+ if (cluster1->GetChamberId() > 3) return;
+
+ Int_t label1 = cluster1->GetMCLabel();
+ if (label1 < 0) continue;
+
+ Int_t nIdenticalLabel = 1;
+
+ // Loop over next clusters
+ for (Int_t iCluster2 = iCluster1+1; iCluster2 < nClusters; iCluster2++) {
+ AliMUONVCluster* cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr();
+
+ if (cluster2->GetMCLabel() != label1) continue;
+
+ nIdenticalLabel++;
+
+ // stop as soon as conditions are fulfilled
+ if (nIdenticalLabel > halfCluster && cluster2->GetChamberId() > 5) {
+ fTrackID = label1;
+ return;
+ }
+
+ }
+
+ }
+
+}
+