X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=MUON%2FAliMUONTrackReconstructor.cxx;h=4d1ae1125fd6ab0172dac2dcd6661bc66be47e7e;hb=d5c9a22c384e2ab9fb589650a71cea4ffa9bb8ac;hp=2b894b52203ab772aa266a972ca24225ea52c2cc;hpb=fff097e09004f19ca713ffa23f1f641b56893d1d;p=u%2Fmrichter%2FAliRoot.git diff --git a/MUON/AliMUONTrackReconstructor.cxx b/MUON/AliMUONTrackReconstructor.cxx index 2b894b52203..4d1ae1125fd 100644 --- a/MUON/AliMUONTrackReconstructor.cxx +++ b/MUON/AliMUONTrackReconstructor.cxx @@ -15,728 +15,87 @@ /* $Id$ */ -//////////////////////////////////// -// -// MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor) -// -// This class contains as data: -// * the parameters for the track reconstruction -// * a pointer to the array of hits to be reconstructed (the event) -// * a pointer to the array of segments made with these hits inside each station -// * a pointer to the array of reconstructed tracks -// -// It contains as methods, among others: -// * MakeEventToBeReconstructed to build the array of hits to be reconstructed -// * MakeSegments to build the segments -// * MakeTracks to build the tracks -// -//////////////////////////////////// +/// \class AliMUONTrackReconstructor +/// MUON track reconstructor using the original method +/// +/// This class contains as data: +/// - the parameters for the track reconstruction +/// +/// It contains as methods, among others: +/// - MakeTracks to build the tracks +/// #include #include -#include -#include #include +#include "AliMUONVTrackReconstructor.h" #include "AliMUONTrackReconstructor.h" -#include "AliMUON.h" +#include "AliMUONData.h" #include "AliMUONConstants.h" -#include "AliMUONHitForRec.h" -#include "AliMUONTriggerTrack.h" -#include "AliMUONTriggerCircuit.h" #include "AliMUONRawCluster.h" -#include "AliMUONLocalTrigger.h" -#include "AliMUONGlobalTrigger.h" -#include "AliMUONSegment.h" +#include "AliMUONHitForRec.h" +#include "AliMUONObjectPair.h" #include "AliMUONTrack.h" -#include "AliMUONTrackHit.h" -#include "AliMagF.h" -#include "AliRun.h" // for gAlice -#include "AliRunLoader.h" -#include "AliLoader.h" -#include "AliMUONTrackK.h" -#include "AliMC.h" +#include "AliMUONTrackParam.h" +#include "AliMUONTrackExtrap.h" #include "AliLog.h" -#include "AliTrackReference.h" +#include -//************* Defaults parameters for reconstruction -const Double_t AliMUONTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0; -const Double_t AliMUONTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0; -const Double_t AliMUONTrackReconstructor::fgkDefaultMaxChi2 = 100.0; -const Double_t AliMUONTrackReconstructor::fgkDefaultMaxSigma2Distance = 16.0; -const Double_t AliMUONTrackReconstructor::fgkDefaultBendingResolution = 0.01; -const Double_t AliMUONTrackReconstructor::fgkDefaultNonBendingResolution = 0.144; -const Double_t AliMUONTrackReconstructor::fgkDefaultChamberThicknessInX0 = 0.03; -// Simple magnetic field: -// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG -// Length and Position from reco_muon.F, with opposite sign: -// Length = ZMAGEND-ZCOIL -// Position = (ZMAGEND+ZCOIL)/2 -// to be ajusted differently from real magnetic field ???? -const Double_t AliMUONTrackReconstructor::fgkDefaultSimpleBValue = 7.0; -const Double_t AliMUONTrackReconstructor::fgkDefaultSimpleBLength = 428.0; -const Double_t AliMUONTrackReconstructor::fgkDefaultSimpleBPosition = 1019.0; -const Int_t AliMUONTrackReconstructor::fgkDefaultRecTrackRefHits = 0; -const Double_t AliMUONTrackReconstructor::fgkDefaultEfficiency = 0.95; +// 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(AliMUONTrackParam *param); +/// \cond CLASSIMP ClassImp(AliMUONTrackReconstructor) // Class implementation in ROOT context +/// \endcond + +//************* Defaults parameters for reconstruction +const Double_t AliMUONTrackReconstructor::fgkMaxNormChi2 = 100.0; +const Bool_t AliMUONTrackReconstructor::fgkTrackAllTracks = kFALSE; //__________________________________________________________________________ -AliMUONTrackReconstructor::AliMUONTrackReconstructor(AliLoader* loader, AliMUONData* data) - : TObject() +AliMUONTrackReconstructor::AliMUONTrackReconstructor(AliMUONData* data) + : AliMUONVTrackReconstructor(data) { - // Constructor for class AliMUONTrackReconstructor - SetReconstructionParametersToDefaults(); - fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman) - // Memory allocation for the TClonesArray of hits for reconstruction - // Is 10000 the right size ???? - fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000); - fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ???? - // Memory allocation for the TClonesArray's of segments in stations - // Is 2000 the right size ???? - for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) { - fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000); - fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ???? - } + /// Constructor for class AliMUONTrackReconstructor + // Memory allocation for the TClonesArray of reconstructed tracks - // Is 10 the right size ???? fRecTracksPtr = new TClonesArray("AliMUONTrack", 10); - fNRecTracks = 0; // really needed or GetEntriesFast sufficient ???? - // Memory allocation for the TClonesArray of hits on reconstructed tracks - // Is 100 the right size ???? - fRecTrackHitsPtr = new TClonesArray("AliMUONTrackHit", 100); - fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ???? - - // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950). - Float_t b[3], x[3]; - x[0] = 50.; x[1] = 50.; x[2] = -950.; - gAlice->Field()->Field(x, b); - fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]); - fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]); - // See how to get fSimple(BValue, BLength, BPosition) - // automatically calculated from the actual magnetic field ???? - - AliDebug(1,"AliMUONTrackReconstructor constructed with defaults"); - if ( AliLog::GetGlobalDebugLevel()>0) Dump(); - AliDebug(1,"Magnetic field from root file:"); - if ( AliLog::GetGlobalDebugLevel()>0) gAlice->Field()->Dump(); - - - // Initializions for track ref. background events - fBkgTrackRefFile = 0; - fBkgTrackRefTK = 0; - fBkgTrackRefParticles = 0; - fBkgTrackRefTTR = 0; - fBkgTrackRefEventNumber = -1; - - // initialize loader's - fLoader = loader; - - // initialize container - // fMUONData = new AliMUONData(fLoader,"MUON","MUON"); - fMUONData = data; - - return; -} - //__________________________________________________________________________ -AliMUONTrackReconstructor::AliMUONTrackReconstructor (const AliMUONTrackReconstructor& rhs) - : TObject(rhs) -{ -// Protected copy constructor - - AliFatal("Not implemented."); -} - -AliMUONTrackReconstructor & -AliMUONTrackReconstructor::operator=(const AliMUONTrackReconstructor& rhs) -{ -// Protected assignement operator - - if (this == &rhs) return *this; - - AliFatal("Not implemented."); - - return *this; } //__________________________________________________________________________ AliMUONTrackReconstructor::~AliMUONTrackReconstructor(void) { - // Destructor for class AliMUONTrackReconstructor - delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ???? - for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) - delete fSegmentsPtr[st]; // Correct destruction of everything ???? - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::SetReconstructionParametersToDefaults(void) -{ - // Set reconstruction parameters to default values - // Would be much more convenient with a structure (or class) ???? - fMinBendingMomentum = fgkDefaultMinBendingMomentum; - fMaxBendingMomentum = fgkDefaultMaxBendingMomentum; - fMaxChi2 = fgkDefaultMaxChi2; - fMaxSigma2Distance = fgkDefaultMaxSigma2Distance; - - // ******** Parameters for making HitsForRec - // minimum radius, - // like in TRACKF_STAT: - // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3; - // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9 - for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) { - if (ch < 4) fRMin[ch] = TMath::Abs(AliMUONConstants::DefaultChamberZ(ch)) * - 2.0 * TMath::Pi() / 180.0; - else fRMin[ch] = 30.0; - // maximum radius at 10 degrees and Z of chamber - fRMax[ch] = TMath::Abs(AliMUONConstants::DefaultChamberZ(ch)) * - 10.0 * TMath::Pi() / 180.0; - } - - // ******** Parameters for making segments - // should be parametrized ???? - // according to interval between chambers in a station ???? - // Maximum distance in non bending plane - // 5 * 0.22 just to remember the way it was made in TRACKF_STAT - // SIGCUT*DYMAX(IZ) - for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) - fSegmentMaxDistNonBending[st] = 5. * 0.22; - // Maximum distance in bending plane: - // values from TRACKF_STAT, corresponding to (J psi 20cm), - // scaled to the real distance between chambers in a station - fSegmentMaxDistBending[0] = TMath::Abs( 1.5 * - (AliMUONConstants::DefaultChamberZ(1) - AliMUONConstants::DefaultChamberZ(0)) / 20.0); - fSegmentMaxDistBending[1] = TMath::Abs( 1.5 * - (AliMUONConstants::DefaultChamberZ(3) - AliMUONConstants::DefaultChamberZ(2)) / 20.0); - fSegmentMaxDistBending[2] = TMath::Abs( 3.0 * - (AliMUONConstants::DefaultChamberZ(5) - AliMUONConstants::DefaultChamberZ(4)) / 20.0); - fSegmentMaxDistBending[3] = TMath::Abs( 6.0 * - (AliMUONConstants::DefaultChamberZ(7) - AliMUONConstants::DefaultChamberZ(6)) / 20.0); - fSegmentMaxDistBending[4] = TMath::Abs( 6.0 * - (AliMUONConstants::DefaultChamberZ(9) - AliMUONConstants::DefaultChamberZ(8)) / 20.0); - - - fBendingResolution = fgkDefaultBendingResolution; - fNonBendingResolution = fgkDefaultNonBendingResolution; - fChamberThicknessInX0 = fgkDefaultChamberThicknessInX0; - fSimpleBValue = fgkDefaultSimpleBValue; - fSimpleBLength = fgkDefaultSimpleBLength; - fSimpleBPosition = fgkDefaultSimpleBPosition; - fRecTrackRefHits = fgkDefaultRecTrackRefHits; - fEfficiency = fgkDefaultEfficiency; - return; -} - -//__________________________________________________________________________ -Double_t AliMUONTrackReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const -{ - // Returns impact parameter at vertex in bending plane (cm), - // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c), - // using simple values for dipole magnetic field. - // The sign of "BendingMomentum" is the sign of the charge. - return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition / - BendingMomentum); -} - -//__________________________________________________________________________ -Double_t AliMUONTrackReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const -{ - // Returns signed bending momentum in bending plane (GeV/c), - // the sign being the sign of the charge for particles moving forward in Z, - // from the impact parameter "ImpactParam" at vertex in bending plane (cm), - // using simple values for dipole magnetic field. - return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition / - ImpactParam); -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::SetBkgTrackRefFile(Text_t *BkgTrackRefFileName) -{ - // Set background file ... for track ref. hits - // Must be called after having loaded the firts signal event - AliDebug(1,Form("Enter SetBkgTrackRefFile with BkgTrackRefFileName %s",BkgTrackRefFileName)); - - if (strlen(BkgTrackRefFileName)) { - // BkgTrackRefFileName not empty: try to open the file - - if(AliLog::GetGlobalDebugLevel()>1) { - cout << "Before File(Bkg)" << endl; gDirectory->Dump(); - } - fBkgTrackRefFile = new TFile(BkgTrackRefFileName); - if(AliLog::GetGlobalDebugLevel()>1) { - cout << "After File(Bkg)" << endl; gDirectory->Dump(); - } - if (fBkgTrackRefFile-> IsOpen()) { - if(AliLog::GetGlobalDebugLevel()>0) { - cout << "Background for Track ref. hits in file: ``" << BkgTrackRefFileName - << "'' successfully opened" << endl;} - } - else { - cout << "Background for Track Ref. hits in file: " << BkgTrackRefFileName << endl; - cout << "NOT FOUND: EXIT" << endl; - exit(0); // right instruction for exit ???? - } - // Arrays for "particles" and "hits" - fBkgTrackRefParticles = new TClonesArray("TParticle", 200); - // Event number to -1 for initialization - fBkgTrackRefEventNumber = -1; - // Back to the signal file: - // first signal event must have been loaded previously, - // otherwise, Segmentation violation at the next instruction - // How is it possible to do smething better ???? - ((gAlice->TreeK())->GetCurrentFile())->cd(); - if(AliLog::GetGlobalDebugLevel()>1) cout << "After cd(gAlice)" << endl; gDirectory->Dump(); - } - return; -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::NextBkgTrackRefEvent(void) -{ - // Get next event in background file for track ref. hits - // Goes back to event number 0 when end of file is reached - char treeName[20]; - - AliDebug(1,"Enter NextBkgTrackRefEvent"); - // Clean previous event - if(fBkgTrackRefTK) delete fBkgTrackRefTK; - fBkgTrackRefTK = NULL; - if(fBkgTrackRefParticles) fBkgTrackRefParticles->Clear(); - if(fBkgTrackRefTTR) delete fBkgTrackRefTTR; - fBkgTrackRefTTR = NULL; - // Increment event number - fBkgTrackRefEventNumber++; - // Get access to Particles and Hits for event from background file - if (AliLog::GetGlobalDebugLevel()>1) cout << "Before cd(Bkg)" << endl; gDirectory->Dump(); - fBkgTrackRefFile->cd(); - if (AliLog::GetGlobalDebugLevel()>1) cout << "After cd(Bkg)" << endl; gDirectory->Dump(); - // Particles: TreeK for event and branch "Particles" - sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber); - fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName); - if (!fBkgTrackRefTK) { - - AliDebug(1,Form("Cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber)); - AliDebug(1,"Goes back to event 0"); - - fBkgTrackRefEventNumber = 0; - sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber); - fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName); - if (!fBkgTrackRefTK) { - AliError(Form("cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber)); - exit(0); - } - } - if (fBkgTrackRefTK) - fBkgTrackRefTK->SetBranchAddress("Particles", &fBkgTrackRefParticles); - fBkgTrackRefTK->GetEvent(0); // why event 0 ???? necessary ???? - // Hits: TreeH for event and branch "MUON" - sprintf(treeName, "TreeTR%d", fBkgTrackRefEventNumber); - fBkgTrackRefTTR = (TTree*)gDirectory->Get(treeName); - if (!fBkgTrackRefTTR) { - AliError(Form("cannot find Hits Tree for background event: %d",fBkgTrackRefEventNumber)); - exit(0); - } - fBkgTrackRefTTR->GetEntries(); // necessary ???? - // Back to the signal file - ((gAlice->TreeK())->GetCurrentFile())->cd(); - if (AliLog::GetGlobalDebugLevel()>1) - cout << "After cd(gAlice)" << endl; gDirectory->Dump(); - return; -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::EventReconstruct(void) -{ - // To reconstruct one event - AliDebug(1,"Enter EventReconstruct"); - ResetTracks(); //AZ - ResetTrackHits(); //AZ - ResetSegments(); //AZ - ResetHitsForRec(); //AZ - MakeEventToBeReconstructed(); - MakeSegments(); - MakeTracks(); - if (fMUONData->IsTriggerTrackBranchesInTree()) - ValidateTracksWithTrigger(); - - // Add tracks to MUON data container - for(Int_t i=0; iAt(i); - fMUONData->AddRecTrack(*track); - } - - return; -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::EventReconstructTrigger(void) -{ - // To reconstruct one event - AliDebug(1,"Enter EventReconstructTrigger"); - MakeTriggerTracks(); - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::ResetHitsForRec(void) -{ - // To reset the array and the number of HitsForRec, - // and also the number of HitsForRec - // and the index of the first HitForRec per chamber - if (fHitsForRecPtr) fHitsForRecPtr->Clear(); - fNHitsForRec = 0; - for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) - fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0; - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::ResetSegments(void) -{ - // To reset the TClonesArray of segments and the number of Segments - // for all stations - for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) { - if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear(); - fNSegments[st] = 0; - } - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::ResetTracks(void) -{ - // To reset the TClonesArray of reconstructed tracks - if (fRecTracksPtr) fRecTracksPtr->Delete(); - // Delete in order that the Track destructors are called, - // hence the space for the TClonesArray of pointers to TrackHit's is freed - fNRecTracks = 0; - return; -} - - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::ResetTrackHits(void) -{ - // To reset the TClonesArray of hits on reconstructed tracks - if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear(); - fNRecTrackHits = 0; - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::MakeEventToBeReconstructed(void) -{ - // To make the list of hits to be reconstructed, - // either from the track ref. hits or from the raw clusters - // according to the parameter set for the reconstructor -// TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly - -// AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname); -// if (rl == 0x0) -// { -// Error("MakeEventToBeReconstructed", -// "Can not find Run Loader in Event Folder named %s.", -// evfoldname.Data()); -// return; -// } -// AliLoader* gime = rl->GetLoader("MUONLoader"); -// if (gime == 0x0) -// { -// Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader."); -// return; -// } - AliRunLoader *runLoader = fLoader->GetRunLoader(); - - AliDebug(1,"Enter MakeEventToBeReconstructed"); - //AZ ResetHitsForRec(); - if (fRecTrackRefHits == 1) { - // Reconstruction from track ref. hits - // Back to the signal file - TTree* treeTR = runLoader->TreeTR(); - if (treeTR == 0x0) - { - Int_t retval = runLoader->LoadTrackRefs("READ"); - if ( retval) - { - AliError("Error occured while loading hits."); - return; - } - treeTR = runLoader->TreeTR(); - if (treeTR == 0x0) - { - AliError("Can not get TreeTR"); - return; - } - } - - AddHitsForRecFromTrackRef(treeTR,1); - - // Background hits - AddHitsForRecFromTrackRef(fBkgTrackRefTTR,0); - // Sort HitsForRec in increasing order with respect to chamber number - SortHitsForRecWithIncreasingChamber(); - } - else { - // Reconstruction from raw clusters - // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? - // Security on MUON ???? - // TreeR assumed to be be "prepared" in calling function - // by "MUON->GetTreeR(nev)" ???? - TTree *treeR = fLoader->TreeR(); - //AZ? fMUONData->SetTreeAddress("RC"); - AddHitsForRecFromRawClusters(treeR); - // No sorting: it is done automatically in the previous function - } - - AliDebug(1,"End of MakeEventToBeReconstructed"); - if (AliLog::GetGlobalDebugLevel() > 0) { - AliDebug(1, Form("NHitsForRec: %d",fNHitsForRec)); - for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) { - AliDebug(1, Form("Chamber(0...): %d",ch)); - AliDebug(1, Form("NHitsForRec: %d", fNHitsForRecPerChamber[ch])); - AliDebug(1, Form("Index(first HitForRec): %d", fIndexOfFirstHitForRecPerChamber[ch])); - for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch]; - hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch]; - hit++) { - AliDebug(1, Form("HitForRec index(0...): %d",hit)); - ((*fHitsForRecPtr)[hit])->Dump(); - } - } - } - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::AddHitsForRecFromTrackRef(TTree *TTR, Int_t signal) -{ - // To add to the list of hits for reconstruction - // the signal hits from a track reference tree TreeTR. - TClonesArray *listOfTrackRefs = NULL; - AliTrackReference *trackRef; - - Int_t track = 0; - AliDebug(2,Form("Enter AddHitsForRecFromTrackRef with TTR: %d", TTR)); - if (TTR == NULL) return; - - listOfTrackRefs = CleanTrackRefs(TTR); - - Int_t ntracks = listOfTrackRefs->GetEntriesFast(); - - AliDebug(2,Form("ntracks: %d", ntracks)); - - for (Int_t index = 0; index < ntracks; index++) { - trackRef = (AliTrackReference*) listOfTrackRefs->At(index); - track = trackRef->GetTrack(); - - NewHitForRecFromTrackRef(trackRef,track,signal); - } // end of track ref. - - listOfTrackRefs->Delete(); - delete listOfTrackRefs; - return; -} - - - //__________________________________________________________________________ -AliMUONHitForRec* AliMUONTrackReconstructor::NewHitForRecFromTrackRef(AliTrackReference* Hit, Int_t TrackNumber, Int_t Signal) -{ - // To make a new hit for reconstruction from a track ref. hit pointed to by "Hit", - // with the track numbered "TrackNumber", - // either from signal ("Signal" = 1) or background ("Signal" = 0) event. - // Selects hits in tracking (not trigger) chambers. - // Takes into account the efficiency (fEfficiency) - // and the smearing from resolution (fBendingResolution and fNonBendingResolution). - // Adds a condition on the radius between RMin and RMax - // to better simulate the real chambers. - // Returns the pointer to the new hit for reconstruction, - // or NULL in case of inefficiency or non tracking chamber or bad radius. - // No condition on at most 20 cm from a muon from a resonance - // like in Fortran TRACKF_STAT. - AliMUONHitForRec* hitForRec; - Double_t bendCoor, nonBendCoor, radius; - Int_t chamber = AliMUONConstants::ChamberNumber(Hit->Z()); // chamber(0...) - if (chamber < 0) return NULL; - // only in tracking chambers (fChamber starts at 1) - if (chamber >= AliMUONConstants::NTrackingCh()) return NULL; - // only if hit is efficient (keep track for checking ????) - if (gRandom->Rndm() > fEfficiency) return NULL; - // only if radius between RMin and RMax - bendCoor = Hit->Y(); - nonBendCoor = Hit->X(); - radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor)); - // This cut is not needed with a realistic chamber geometry !!!! -// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL; - // new AliMUONHitForRec from track ref. hit and increment number of AliMUONHitForRec's - hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit); - fNHitsForRec++; - // add smearing from resolution - hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution)); - hitForRec->SetNonBendingCoor(nonBendCoor - + gRandom->Gaus(0., fNonBendingResolution)); -// // !!!! without smearing -// hitForRec->SetBendingCoor(bendCoor); -// hitForRec->SetNonBendingCoor(nonBendCoor); - // more information into HitForRec - // resolution: angular effect to be added here ???? - hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution); - hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution); - // track ref. info - hitForRec->SetTTRTrack(TrackNumber); - hitForRec->SetTrackRefSignal(Signal); - if (AliLog::GetGlobalDebugLevel()> 1) { - AliDebug(2,Form("Track: %d", TrackNumber)); - Hit->Dump(); - cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl; - hitForRec->Dump(); - } - return hitForRec; -} - //__________________________________________________________________________ -TClonesArray* AliMUONTrackReconstructor::CleanTrackRefs(TTree *treeTR) -{ - // Make hits from track ref.. - // Re-calculate hits parameters because two AliTrackReferences are recorded for - // each chamber (one when particle is entering + one when particle is leaving - // the sensitive volume) - - AliTrackReference *trackReference; - Float_t x1, y1, z1, pX1, pY1, pZ1; - Float_t x2, y2, z2, pX2, pY2, pZ2; - Int_t track1, track2; - Int_t nRec = 0; - Float_t maxGasGap = 1.; // cm - Int_t iHit1 = 0; - Int_t iHitMin = 0; - - AliTrackReference *trackReferenceNew = new AliTrackReference(); - - TClonesArray* trackRefs = new TClonesArray("AliTrackReference", 10); - TClonesArray* cleanTrackRefs = new TClonesArray("AliTrackReference", 10); - - if (treeTR == NULL) return NULL; - TBranch* branch = treeTR->GetBranch("MUON"); - if (branch == NULL) return NULL; - branch->SetAddress(&trackRefs); - - Int_t nTrack = (Int_t)treeTR->GetEntries(); - for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) { - treeTR->GetEntry(iTrack); - iHitMin = 0; - iHit1 = 0; - while (iHit1 < trackRefs->GetEntries()) { - trackReference = (AliTrackReference*)trackRefs->At(iHit1); - x1 = trackReference->X(); - y1 = trackReference->Y(); - z1 = trackReference->Z(); - pX1 = trackReference->Px(); - pY1 = trackReference->Py(); - pZ1 = trackReference->Pz(); - track1 = trackReference->GetTrack(); - nRec = 1; - iHitMin = iHit1+1; - for (Int_t iHit2 = iHit1+1; iHit2 < trackRefs->GetEntries(); iHit2++) { - trackReference = (AliTrackReference*)trackRefs->At(iHit2); - x2 = trackReference->X(); - y2 = trackReference->Y(); - z2 = trackReference->Z(); - pX2 = trackReference->Px(); - pY2 = trackReference->Py(); - pZ2 = trackReference->Pz(); - track2 = trackReference->GetTrack(); - if (track2 == track1 && TMath::Abs(z2-z1) < maxGasGap ) { - nRec++; - x1 += x2; - y1 += y2; - z1 += z2; - pX1 += pX2; - pY1 += pY2; - pZ1 += pZ2; - iHitMin = iHit2+1; - } - - } // for iHit2 - x1 /= (Float_t)nRec; - y1 /= (Float_t)nRec; - z1 /= (Float_t)nRec; - pX1 /= (Float_t)nRec; - pY1 /= (Float_t)nRec; - pZ1 /= (Float_t)nRec; - trackReferenceNew->SetPosition(x1,y1,z1); - trackReferenceNew->SetMomentum(pX1,pY1,pZ1); - trackReferenceNew->SetTrack(track1); - {new ((*cleanTrackRefs)[cleanTrackRefs->GetEntriesFast()]) AliTrackReference(*trackReferenceNew);} - iHit1 = iHitMin; - } // while iHit1 - } // for track - - trackRefs->Delete(); - delete trackRefs; - delete trackReferenceNew; - return cleanTrackRefs; - -} - //__________________________________________________________________________ -void AliMUONTrackReconstructor::SortHitsForRecWithIncreasingChamber() -{ - // Sort HitsForRec's in increasing order with respect to chamber number. - // Uses the function "Compare". - // Update the information for HitsForRec per chamber too. - Int_t ch, nhits, prevch; - fHitsForRecPtr->Sort(); - for (ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) { - fNHitsForRecPerChamber[ch] = 0; - fIndexOfFirstHitForRecPerChamber[ch] = 0; - } - prevch = 0; // previous chamber - nhits = 0; // number of hits in current chamber - // Loop over HitsForRec - for (Int_t hit = 0; hit < fNHitsForRec; hit++) { - // chamber number (0...) - ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber(); - // increment number of hits in current chamber - (fNHitsForRecPerChamber[ch])++; - // update index of first HitForRec in current chamber - // if chamber number different from previous one - if (ch != prevch) { - fIndexOfFirstHitForRecPerChamber[ch] = hit; - prevch = ch; - } - } - return; + /// Destructor for class AliMUONTrackReconstructor + delete fRecTracksPtr; } //__________________________________________________________________________ -void AliMUONTrackReconstructor::AddHitsForRecFromRawClusters(TTree* TR) +void AliMUONTrackReconstructor::AddHitsForRecFromRawClusters() { - // To add to the list of hits for reconstruction all the raw clusters - // No condition added, like in Fortran TRACKF_STAT, - // on the radius between RMin and RMax. + /// To add to the list of hits for reconstruction all the raw clusters + TTree *treeR; AliMUONHitForRec *hitForRec; AliMUONRawCluster *clus; - Int_t iclus, nclus, nTRentries; + Int_t iclus, nclus; TClonesArray *rawclusters; AliDebug(1,"Enter AddHitsForRecFromRawClusters"); - - if (fTrackMethod != 3) { //AZ - fMUONData->SetTreeAddress("RC"); //AZ - nTRentries = Int_t(TR->GetEntries()); - if (nTRentries != 1) { - AliError(Form("nTRentries = %d not equal to 1 ",nTRentries)); - exit(0); - } - fLoader->TreeR()->GetEvent(0); // only one entry + + 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); -// pMUON->ResetRawClusters(); -// TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ???? nclus = (Int_t) (rawclusters->GetEntries()); // Loop over (cathode correlated) raw clusters for (iclus = 0; iclus < nclus; iclus++) { @@ -745,11 +104,7 @@ void AliMUONTrackReconstructor::AddHitsForRecFromRawClusters(TTree* TR) // and increment number of AliMUONHitForRec's (total and in chamber) hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus); fNHitsForRec++; - (fNHitsForRecPerChamber[ch])++; // more information into HitForRec - // resolution: info should be already in raw cluster and taken from it ???? - //hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution); - //hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution); hitForRec->SetBendingReso2(clus->GetErrY() * clus->GetErrY()); hitForRec->SetNonBendingReso2(clus->GetErrX() * clus->GetErrX()); // original raw cluster @@ -757,770 +112,892 @@ void AliMUONTrackReconstructor::AddHitsForRecFromRawClusters(TTree* TR) hitForRec->SetHitNumber(iclus); // Z coordinate of the raw cluster (cm) hitForRec->SetZ(clus->GetZ(0)); - if (AliLog::GetGlobalDebugLevel() > 1) { - cout << "chamber (0...): " << ch << - " raw cluster (0...): " << iclus << endl; - clus->Dump(); - cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl; - hitForRec->Dump();} + StdoutToAliDebug(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(); + + AliDebug(1,"End of AddHitsForRecFromRawClusters"); + if (AliLog::GetGlobalDebugLevel() > 0) { + AliDebug(1, Form("NHitsForRec: %d",fNHitsForRec)); + for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) { + AliDebug(1, Form("Chamber(0...): %d",ch)); + AliDebug(1, Form("NHitsForRec: %d", fNHitsForRecPerChamber[ch])); + AliDebug(1, Form("Index(first HitForRec): %d", fIndexOfFirstHitForRecPerChamber[ch])); + for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch]; + hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch]; + hit++) { + AliDebug(1, Form("HitForRec index(0...): %d",hit)); + ((*fHitsForRecPtr)[hit])->Dump(); + } + } + } + return; } //__________________________________________________________________________ -void AliMUONTrackReconstructor::MakeSegments(void) +void AliMUONTrackReconstructor::MakeTracks(void) +{ + /// To make the tracks from the list of segments and points in all stations + AliDebug(1,"Enter MakeTracks"); + // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5 + MakeTrackCandidates(); + // Follow tracks in stations(1..) 3, 2 and 1 + FollowTracks(); + // Remove double tracks + RemoveDoubleTracks(); + // Propagate tracks to the vertex through absorber + ExtrapTracksToVertex(); + // Fill out the AliMUONTrack's + FillMUONTrack(); +} + + //__________________________________________________________________________ +void AliMUONTrackReconstructor::MakeTrackCandidates(void) { - // To make the list of segments in all stations, - // from the list of hits to be reconstructed - AliDebug(1,"Enter MakeSegments"); - //AZ ResetSegments(); - // Loop over stations - Int_t nb = (fTrackMethod != 1) ? 3 : 0; //AZ - for (Int_t st = nb; st < AliMUONConstants::NTrackingCh()/2; st++) - MakeSegmentsPerStation(st); - if (AliLog::GetGlobalDebugLevel() > 1) { - cout << "end of MakeSegments" << endl; - for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) { - cout << "station(0...): " << st - << " Segments: " << fNSegments[st] - << endl; - for (Int_t seg = 0; - seg < fNSegments[st]; - seg++) { - cout << "Segment index(0...): " << seg << endl; - ((*fSegmentsPtr[st])[seg])->Dump(); + /// 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 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; isegGetEntriesFast(); 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++; + // Add MCS effects in parameter covariances + trackParamAtFirstHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First()); + AliMUONTrackExtrap::AddMCSEffectInTrackParamCov(trackParamAtFirstHit,AliMUONConstants::ChamberThicknessInX0(),1.); + // Printout for debuging + if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { + cout<GetCovariances()->Print(); } + // Look for compatible hitForRec(s) in the other station + FollowTrackInStation(track,7-istat); } + // delete the array of segments + delete segments; } - return; + 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)); + } //__________________________________________________________________________ -void AliMUONTrackReconstructor::MakeSegmentsPerStation(Int_t Station) +void AliMUONTrackReconstructor::RemoveIdenticalTracks(void) { - // To make the list of segments in station number "Station" (0...) - // from the list of hits to be reconstructed. - // Updates "fNSegments"[Station]. - // Segments in stations 4 and 5 are sorted - // according to increasing absolute value of "impact parameter" - AliMUONHitForRec *hit1Ptr, *hit2Ptr; - AliMUONSegment *segment; - Bool_t last2st; - Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor, - impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings. - AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",Station)); - // first and second chambers (0...) in the station - Int_t ch1 = 2 * Station; - Int_t ch2 = ch1 + 1; - // variable true for stations downstream of the dipole: - // Station(0..4) equal to 3 or 4 - if ((Station == 3) || (Station == 4)) { - last2st = kTRUE; - // maximum impact parameter (cm) according to fMinBendingMomentum... - maxImpactParam = - TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum)); - // minimum impact parameter (cm) according to fMaxBendingMomentum... - minImpactParam = - TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum)); - } - else last2st = kFALSE; - // extrapolation factor from Z of first chamber to Z of second chamber - // dZ to be changed to take into account fine structure of chambers ???? - Double_t extrapFact; - // index for current segment - Int_t segmentIndex = 0; - // Loop over HitsForRec in the first chamber of the station - for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1]; - hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1]; - hit1++) { - // pointer to the HitForRec - hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]); - // extrapolation, - // on the straight line joining the HitForRec to the vertex (0,0,0), - // to the Z of the second chamber of the station - // Loop over HitsForRec in the second chamber of the station - for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2]; - hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2]; - hit2++) { - // pointer to the HitForRec - hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]); - // absolute values of distances, in bending and non bending planes, - // between the HitForRec in the second chamber - // and the previous extrapolation - extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ(); - extBendCoor = extrapFact * hit1Ptr->GetBendingCoor(); - extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor(); - distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor); - distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor); - if (last2st) { - // bending slope - bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / - (hit1Ptr->GetZ() - hit2Ptr->GetZ()); - // absolute value of impact parameter - impactParam = - TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope); - } - // check for distances not too large, - // and impact parameter not too big if stations downstream of the dipole. - // Conditions "distBend" and "impactParam" correlated for these stations ???? - if ((distBend < fSegmentMaxDistBending[Station]) && - (distNonBend < fSegmentMaxDistNonBending[Station]) && - (!last2st || (impactParam < maxImpactParam)) && - (!last2st || (impactParam > minImpactParam))) { - // make new segment - segment = new ((*fSegmentsPtr[Station])[segmentIndex]) - AliMUONSegment(hit1Ptr, hit2Ptr); - // update "link" to this segment from the hit in the first chamber - if (hit1Ptr->GetNSegments() == 0) - hit1Ptr->SetIndexOfFirstSegment(segmentIndex); - hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1); - if (AliLog::GetGlobalDebugLevel() > 1) { - cout << "segmentIndex(0...): " << segmentIndex - << " distBend: " << distBend - << " distNonBend: " << distNonBend - << endl; - segment->Dump(); - cout << "HitForRec in first chamber" << endl; - hit1Ptr->Dump(); - cout << "HitForRec in second chamber" << endl; - hit2Ptr->Dump(); - }; - // increment index for current segment - segmentIndex++; - } - } //for (Int_t hit2 - } // for (Int_t hit1... - fNSegments[Station] = segmentIndex; - // Sorting according to "impact parameter" if station(1..5) 4 or 5, - // i.e. Station(0..4) 3 or 4, using the function "Compare". - // After this sorting, it is impossible to use - // the "fNSegments" and "fIndexOfFirstSegment" - // of the HitForRec in the first chamber to explore all segments formed with it. - // Is this sorting really needed ???? - if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort(); - AliDebug(1,Form("Station: %d NSegments: %d ", Station, fNSegments[Station])); + /// 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::MakeTracks(void) +void AliMUONTrackReconstructor::RemoveDoubleTracks(void) { - // To make the tracks, - // from the list of segments and points in all stations - AliDebug(1,"Enter MakeTracks"); - // The order may be important for the following Reset's - //AZ ResetTracks(); - //AZ ResetTrackHits(); - if (fTrackMethod != 1) { //AZ - Kalman filter - MakeTrackCandidatesK(); - if (fRecTracksPtr->GetEntriesFast() == 0) return; - // Follow tracks in stations(1..) 3, 2 and 1 - FollowTracksK(); - // Remove double tracks - RemoveDoubleTracksK(); - // Propagate tracks to the vertex thru absorber - GoToVertex(); - // Fill AliMUONTrack data members - FillMUONTrack(); - } else { - // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5 - MakeTrackCandidates(); - // Follow tracks in stations(1..) 3, 2 and 1 - FollowTracks(); - // Remove double tracks - RemoveDoubleTracks(); - UpdateTrackParamAtHit(); - UpdateHitForRecAtHit(); - } + /// 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::ValidateTracksWithTrigger(void) +void AliMUONTrackReconstructor::FollowTracks(void) { - // Try to match track from tracking system with trigger track - AliMUONTrack *track; - TClonesArray *recTriggerTracks; + /// Follow tracks in stations(1..) 3, 2 and 1 + AliDebug(1,"Enter FollowTracks"); - fMUONData->SetTreeAddress("RL"); - fMUONData->GetRecTriggerTracks(); - recTriggerTracks = fMUONData->RecTriggerTracks(); - + AliMUONTrack *track, *nextTrack; + 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 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::AddMCSEffectInTrackParamCov(trackParamAtFirstHit,AliMUONConstants::ChamberThicknessInX0(),1.); + // Printout for debuging + if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { + cout<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(); while (track) { - track->MatchTriggerTrack(recTriggerTracks); - track = (AliMUONTrack*) fRecTracksPtr->After(track); + trackIndex++; + nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track + track->SetFitWithVertex(kFALSE); // just to be sure + Fit(track,kTRUE, kFALSE); + // 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--; + } + track = nextTrack; } - + fRecTracksPtr->Compress(); + } //__________________________________________________________________________ -Bool_t AliMUONTrackReconstructor::MakeTriggerTracks(void) +void AliMUONTrackReconstructor::FollowTrackInStation(AliMUONTrack* trackCandidate, Int_t nextStation) { - // To make the trigger tracks from Local Trigger - AliDebug(1, "Enter MakeTriggerTracks"); - - Int_t nTRentries; - Long_t gloTrigPat; - TClonesArray *localTrigger; - TClonesArray *globalTrigger; - AliMUONLocalTrigger *locTrg; - AliMUONGlobalTrigger *gloTrg; - AliMUONTriggerCircuit *circuit; - AliMUONTriggerTrack *recTriggerTrack = 0; - - TTree* treeR = fLoader->TreeR(); - - // Loading MUON subsystem - AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON"); - - nTRentries = Int_t(treeR->GetEntries()); - - treeR->GetEvent(0); // only one entry - - if (!(fMUONData->IsTriggerBranchesInTree())) { - AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries)); - return kFALSE; + /// 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<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; + } + 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 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; + } + } } - - fMUONData->SetTreeAddress("TC"); - fMUONData->GetTrigger(); - - // global trigger for trigger pattern - gloTrigPat = 0; - globalTrigger = fMUONData->GlobalTrigger(); - gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0); - if (gloTrg) { - if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1; - if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2; - if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4; - - if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8; - if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10; - if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20; - - if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40; - if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80; - if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100; - - if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200; - if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400; - if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800; - - if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000; - if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000; - if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000; + // 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; } - - // local trigger for tracking - localTrigger = fMUONData->LocalTrigger(); - Int_t nlocals = (Int_t) (localTrigger->GetEntries()); - - Float_t z11 = AliMUONConstants::DefaultChamberZ(10); - Float_t z21 = AliMUONConstants::DefaultChamberZ(12); - - for (Int_t i=0; iUncheckedAt(i); - circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit())); - Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX()); - Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1; - Float_t y21 = circuit->GetY21Pos(stripX21); - Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY()); - Float_t thetax = TMath::ATan2( x11 , z11 ); - Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) ); - - recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat); - - // since static statement does not work, set gloTrigPat for each track - - fMUONData->AddRecTriggerTrack(*recTriggerTrack); - delete recTriggerTrack; - } // end of loop on Local Trigger - return kTRUE; + 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; + } + } + } + } + // + // 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(); + } + } 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(); + } + } + } else { + fRecTracksPtr->Remove(trackCandidate); // obsolete track + fNRecTracks--; + } + } //__________________________________________________________________________ -Int_t AliMUONTrackReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment) +void AliMUONTrackReconstructor::SetVertexForFit(AliMUONTrack* trackCandidate) { - // 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, this); - fNRecTracks++; - if (AliLog::GetGlobalDebugLevel() > 1) recTrack->RecursiveDump(); - // increment number of track candidates with 2 segments - nbCan2Seg++; - } - delete extrapSegment; // should not delete HitForRec's it points to !!!! - } // for (iEndSegment = 0;... - return nbCan2Seg; + /// 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"); + + 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); } //__________________________________________________________________________ -Int_t AliMUONTrackReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment) +void AliMUONTrackReconstructor::Fit(AliMUONTrack *track, Bool_t includeMCS, Bool_t calcCov) { - // 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, this); - // 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; + /// Fit the track "track" with or without multiple Coulomb scattering according to "includeMCS". + + Double_t benC, errorParam, invBenP, nonBenC, x, y; + AliMUONTrackParam *trackParam; + Double_t arg[1], fedm, errdef, fitFMin; + Int_t npari, nparx; + Int_t status, covStatus; + + // 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 + 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) ???? + // 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 + 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") + gMinuit->GetParameter(0, x, errorParam); + trackParam->SetNonBendingCoor(x); + gMinuit->GetParameter(1, nonBenC, errorParam); + trackParam->SetNonBendingSlope(nonBenC); + 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 + 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 AliMUONTrackReconstructor::MakeTrackCandidates(void) +void TrackChi2(Int_t & /*NParam*/, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/) { - // 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; - 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; + /// 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 + + 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 + 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!!"<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) { + hitForRec = trackParamAtHit->GetHitForRecPtr(); + // extrapolation to the plane of the hitForRec attached to the current trackParamAtHit + AliMUONTrackExtrap::ExtrapToZ(¶m1, hitForRec->GetZ()); + // update track parameters of the current hit + trackParamAtHit->SetTrackParam(param1); + // Increment Chi2 + // done hit per hit, with hit resolution, + // and not with point and angle like in "reco_muon.F" !!!! + 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 AliMUONTrackReconstructor::FollowTracks(void) +void TrackChi2MCS(Int_t & /*NParam*/, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/) { - // Follow tracks in stations(1..) 3, 2 and 1 - // too long: should be made more modular !!!! - AliMUONHitForRec *bestHit, *extrapHit, *hit; - AliMUONSegment *bestSegment, *extrapSegment, *segment; - 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 - track = (AliMUONTrack*) fRecTracksPtr->First(); - trackIndex = -1; - while (track) { - // Follow function for each track candidate ???? - trackIndex++; - nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track - AliDebug(2,Form("FollowTracks: track candidate(0..): %d", trackIndex)); - // Fit track candidate - track->SetFitMCS(0); // without multiple Coulomb scattering - track->SetFitNParam(3); // with 3 parameters (X = Y = 0) - track->SetFitStart(0); // from parameters at vertex - track->Fit(); - if (AliLog::GetGlobalDebugLevel()> 2) { - cout << "FollowTracks: track candidate(0..): " << trackIndex - << " after fit in stations(0..) 3 and 4" << endl; - track->RecursiveDump(); + /// 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. + + AliMUONTrack *trackBeingFitted = (AliMUONTrack*) gMinuit->GetObjectFit(); +// AliMUONTrack *trackBeingFitted = (AliMUONTrack*) AliMUONTrackReconstructor::Fitter()->GetObjectFit(); + AliMUONTrackParam param1; + AliMUONTrackParam* trackParamAtHit; + AliMUONHitForRec* hitForRec; + Chi2 = 0.0; // initialize Chi2 + Int_t chCurrent, chPrev = 0, hitNumber, hitNumber1, hitNumber2, hitNumber3; + Double_t z1, z2, z3; + AliMUONTrackParam *trackParamAtHit1, *trackParamAtHit2, *trackParamAtHit3; + AliMUONHitForRec *hitForRec1, *hitForRec2; + Double_t hbc1, hbc2, pbc1, pbc2; + Double_t hnbc1, hnbc2, pnbc1, pnbc2; + Int_t numberOfHit = trackBeingFitted->GetNTrackHits(); + 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]); + + // 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!!"<= 0; station--) { - // Track parameters at first track hit (smallest Z) - trackParam1 = ((AliMUONTrackHit*) - (track->GetTrackHitsPtr()->First()))->GetTrackParam(); - // extrapolation to station - trackParam1->ExtrapToStation(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; - } - // 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" - (&(trackParam[0]))->ExtrapToZ(segment->GetZ()); - (&(trackParam[1]))->ExtrapToZ(segment->GetZ()); - 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; - } - } - if (bestSegment) { - // best segment found: add it to track candidate - (&(trackParam[0]))->ExtrapToZ(bestSegment->GetZ()); - (&(trackParam[1]))->ExtrapToZ(bestSegment->GetZ()); - track->AddSegment(bestSegment); - // set track parameters at these two TrakHit's - track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0])); - track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1])); - 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 - (&(trackParam[chInStation]))->ExtrapToZ(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; - } - } - } - if (bestHit) { - // best hit found: add it to track candidate - (&(trackParam[chBestHit]))->ExtrapToZ(bestHit->GetZ()); - track->AddHitForRec(bestHit); - // set track parameters at this TrackHit - track->SetTrackParamAtHit(track->GetNTrackHits() - 1, - &(trackParam[chBestHit])); - 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, ... - track->Remove(); - delete extrapSegment; - delete extrapHit; - break; // stop the search for this candidate: - // exit from the loop over station - } - delete extrapHit; - } - delete extrapSegment; - // Sort track hits according to increasing Z - track->GetTrackHitsPtr()->Sort(); - // Update track parameters at first track hit (smallest Z) - trackParam1 = ((AliMUONTrackHit*) - (track->GetTrackHitsPtr()->First()))->GetTrackParam(); - 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)) { - track->Remove(); - break; // stop the search for this candidate: - // exit from the loop over station + 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(); + // extrapolation to the plane of the hitForRec attached to the current trackParamAtHit + AliMUONTrackExtrap::ExtrapToZ(¶m1, hitForRec->GetZ()); + // update track parameters of the current hit + trackParamAtHit->SetTrackParam(param1); + // square of multiple scattering angle at current hit, with one chamber + msa2[hitNumber] = MultipleScatteringAngle2(¶m1); + // correction for eventual missing hits or multiple hits in a chamber, + // according to the number of chambers + // between the current hit and the previous one + chCurrent = hitForRec->GetChamberNumber(); + if (hitNumber > 0) msa2[hitNumber] = msa2[hitNumber] * (chCurrent - chPrev); + chPrev = chCurrent; + } + + // Calculates the covariance matrix + for (hitNumber1 = 0; hitNumber1 < numberOfHit; hitNumber1++) { + trackParamAtHit1 = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber1)); + hitForRec1 = trackParamAtHit1->GetHitForRecPtr(); + z1 = hitForRec1->GetZ(); + for (hitNumber2 = hitNumber1; hitNumber2 < numberOfHit; hitNumber2++) { + trackParamAtHit2 = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber2)); + z2 = trackParamAtHit2->GetHitForRecPtr()->GetZ(); + // initialization to 0 (diagonal plus upper triangular part) + (*covBending)(hitNumber2, hitNumber1) = 0.0; + // contribution from multiple scattering in bending plane: + // loop over upstream hits + for (hitNumber3 = 0; hitNumber3 < hitNumber1; hitNumber3++) { + trackParamAtHit3 = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber3)); + z3 = trackParamAtHit3->GetHitForRecPtr()->GetZ(); + (*covBending)(hitNumber2, hitNumber1) = (*covBending)(hitNumber2, hitNumber1) + ((z1 - z3) * (z2 - z3) * msa2[hitNumber3]); } - // Track fit - // with multiple Coulomb scattering if all stations - if (station == 0) track->SetFitMCS(1); - // without multiple Coulomb scattering if not all stations - else track->SetFitMCS(0); - track->SetFitNParam(5); // with 5 parameters (momentum and position) - track->SetFitStart(1); // from parameters at first hit - track->Fit(); - Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5); - if (numberOfDegFree > 0) { - chi2Norm = track->GetFitFMin() / numberOfDegFree; + // equal contribution from multiple scattering in non bending plane + (*covNonBending)(hitNumber2, hitNumber1) = (*covBending)(hitNumber2, hitNumber1); + if (hitNumber1 == hitNumber2) { + // Diagonal elements: add contribution from position measurements + // in bending plane + (*covBending)(hitNumber2, hitNumber1) = (*covBending)(hitNumber2, hitNumber1) + hitForRec1->GetBendingReso2(); + // and in non bending plane + (*covNonBending)(hitNumber2, hitNumber1) = (*covNonBending)(hitNumber2, hitNumber1) + hitForRec1->GetNonBendingReso2(); } else { - chi2Norm = 1.e10; - } - // Track removed if normalized chi2 too high - if (chi2Norm > fMaxChi2) { - track->Remove(); - break; // stop the search for this candidate: - // exit from the loop over station + // Non diagonal elements: symmetrization + // for bending plane + (*covBending)(hitNumber1, hitNumber2) = (*covBending)(hitNumber2, hitNumber1); + // and non bending plane + (*covNonBending)(hitNumber1, hitNumber2) = (*covNonBending)(hitNumber2, hitNumber1); } - if (AliLog::GetGlobalDebugLevel() > 2) { - cout << "FollowTracks: track candidate(0..): " << trackIndex - << " after fit from station(0..): " << station << " to 4" << endl; - track->RecursiveDump(); - } - // Track extrapolation to the vertex through the absorber (Branson) - // after going through the first station - if (station == 0) { - trackParamVertex = *trackParam1; - (&trackParamVertex)->ExtrapToVertex(0.,0.,0.); - track->SetTrackParamAtVertex(&trackParamVertex); - if (AliLog::GetGlobalDebugLevel() > 0) { - cout << "FollowTracks: track candidate(0..): " << trackIndex - << " after extrapolation to vertex" << endl; - track->RecursiveDump(); - } + } // for (hitNumber2 = hitNumber1;... + } // for (hitNumber1 = 0;... + + // Inversion of covariance matrices + Int_t ifailBending; + gMinuit->mnvert(&((*covBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, ifailBending); + Int_t 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, + // and it would save a lot of computing time !!!! + + // Calculates Chi2 + if ((ifailBending == 0) && (ifailNonBending == 0)) { + // with Multiple Scattering if inversion correct + for (hitNumber1 = 0; hitNumber1 < numberOfHit ; hitNumber1++) { + trackParamAtHit1 = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber1)); + hitForRec1 = trackParamAtHit1->GetHitForRecPtr(); + hbc1 = hitForRec1->GetBendingCoor(); + pbc1 = trackParamAtHit1->GetBendingCoor(); + hnbc1 = hitForRec1->GetNonBendingCoor(); + pnbc1 = trackParamAtHit1->GetNonBendingCoor(); + for (hitNumber2 = 0; hitNumber2 < numberOfHit; hitNumber2++) { + trackParamAtHit2 = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber2)); + hitForRec2 = trackParamAtHit2->GetHitForRecPtr(); + hbc2 = hitForRec2->GetBendingCoor(); + pbc2 = trackParamAtHit2->GetBendingCoor(); + hnbc2 = hitForRec2->GetNonBendingCoor(); + pnbc2 = trackParamAtHit2->GetNonBendingCoor(); + Chi2 += ((*covBending)(hitNumber2, hitNumber1) * (hbc1 - pbc1) * (hbc2 - pbc2)) + + ((*covNonBending)(hitNumber2, hitNumber1) * (hnbc1 - pnbc1) * (hnbc2 - pnbc2)); } - } // for (station = 2;... - // go really to next track - track = nextTrack; - } // while (track) - // Compression of track array (necessary after Remove ????) - fRecTracksPtr->Compress(); - return; + } + } else { + // without Multiple Scattering if inversion impossible + for (hitNumber1 = 0; hitNumber1 < numberOfHit ; hitNumber1++) { + trackParamAtHit1 = (AliMUONTrackParam*) (trackBeingFitted->GetTrackParamAtHit()->UncheckedAt(hitNumber1)); + hitForRec1 = trackParamAtHit1->GetHitForRecPtr(); + hbc1 = hitForRec1->GetBendingCoor(); + pbc1 = trackParamAtHit1->GetBendingCoor(); + hnbc1 = hitForRec1->GetNonBendingCoor(); + pnbc1 = trackParamAtHit1->GetNonBendingCoor(); + Chi2 += ((hbc1 - pbc1) * (hbc1 - pbc1) / hitForRec1->GetBendingReso2()) + + ((hnbc1 - pnbc1) * (hnbc1 - pnbc1) / hitForRec1->GetNonBendingReso2()); + } + } + + delete covBending; + delete covNonBending; + delete [] msa2; } //__________________________________________________________________________ -void AliMUONTrackReconstructor::RemoveDoubleTracks(void) +Double_t MultipleScatteringAngle2(AliMUONTrackParam *param) { - // 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; - Bool_t identicalTracks; - Int_t hitsInCommon, nHits1, nHits2; - identicalTracks = kTRUE; - while (identicalTracks) { - identicalTracks = kFALSE; - // Loop over first track of the pair - track1 = (AliMUONTrack*) fRecTracksPtr->First(); - while (track1 && (!identicalTracks)) { - nHits1 = track1->GetNTrackHits(); - // Loop over second track of the pair - track2 = (AliMUONTrack*) fRecTracksPtr->After(track1); - while (track2 && (!identicalTracks)) { - nHits2 = track2->GetNTrackHits(); - // number of hits in common between two tracks - hitsInCommon = track1->HitsInCommon(track2); - // check for identical tracks - if ((4 * hitsInCommon) >= (nHits1 + nHits2)) { - identicalTracks = kTRUE; - // decide which track to remove - if (nHits1 > nHits2) trackToRemove = track2; - else if (nHits1 < nHits2) trackToRemove = track1; - else if ((track1->GetFitFMin()) < (track2->GetFitFMin())) - trackToRemove = track2; - else trackToRemove = track1; - // remove it - trackToRemove->Remove(); - } - track2 = (AliMUONTrack*) fRecTracksPtr->After(track2); - } // track2 - track1 = (AliMUONTrack*) fRecTracksPtr->After(track1); - } // track1 - } - return; + /// Returns square of multiple Coulomb scattering angle + /// from TrackParamAtHit pointed to by "param" + Double_t slopeBending, slopeNonBending, radiationLength, inverseBendingMomentum2, inverseTotalMomentum2; + Double_t varMultipleScatteringAngle; + slopeBending = param->GetBendingSlope(); + slopeNonBending = param->GetNonBendingSlope(); + // thickness in radiation length for the current track, + // taking local angle into account + radiationLength = AliMUONConstants::ChamberThicknessInX0() * + 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)); + // The velocity is assumed to be 1 !!!! + varMultipleScatteringAngle = inverseTotalMomentum2 * radiationLength * varMultipleScatteringAngle * varMultipleScatteringAngle; + return varMultipleScatteringAngle; } //__________________________________________________________________________ -void AliMUONTrackReconstructor::UpdateTrackParamAtHit() +void AliMUONTrackReconstructor::ExtrapTracksToVertex() { - // Set track parameters after track fitting. Fill fTrackParamAtHit of AliMUONTrack's + /// propagate tracks to the vertex through the absorber (Branson) AliMUONTrack *track; - AliMUONTrackHit *trackHit; - AliMUONTrackParam *trackParam; - track = (AliMUONTrack*) fRecTracksPtr->First(); - while (track) { - trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First(); - while (trackHit) { - trackParam = trackHit->GetTrackParam(); - track->AddTrackParamAtHit(trackParam); - trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit); - } // trackHit - track = (AliMUONTrack*) fRecTracksPtr->After(track); - } // track - return; + AliMUONTrackParam trackParamVertex; + AliMUONHitForRec *vertex; + Double_t vX, vY, vZ; + + for (Int_t iRecTrack = 0; iRecTrack UncheckedAt(iRecTrack); + trackParamVertex = *((AliMUONTrackParam*)(track->GetTrackParamAtHit()->First())); + vertex = track->GetVertex(); + if (vertex) { // if track as a vertex defined, use it + vX = vertex->GetNonBendingCoor(); + vY = vertex->GetBendingCoor(); + vZ = vertex->GetZ(); + } else { // else vertex = (0.,0.,0.) + vX = 0.; + vY = 0.; + vZ = 0.; + } + AliMUONTrackExtrap::ExtrapToVertex(&trackParamVertex, vX, vY, vZ); + track->SetTrackParamAtVertex(&trackParamVertex); + + if (AliLog::GetGlobalDebugLevel() > 0) { + cout << "FollowTracks: track candidate(0..): " << iRecTrack + << " after extrapolation to vertex" << endl; + track->RecursiveDump(); + } + } + } //__________________________________________________________________________ -void AliMUONTrackReconstructor::UpdateHitForRecAtHit() +void AliMUONTrackReconstructor::FillMUONTrack() { - // Set cluster parameterss after track fitting. Fill fHitForRecAtHit of AliMUONTrack's + /// Fill fHitForRecAtHit of AliMUONTrack's AliMUONTrack *track; - AliMUONTrackHit *trackHit; - AliMUONHitForRec *hitForRec; + AliMUONTrackParam *trackParamAtHit; track = (AliMUONTrack*) fRecTracksPtr->First(); while (track) { - trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First(); - while (trackHit) { - hitForRec = trackHit->GetHitForRecPtr(); - track->AddHitForRecAtHit(hitForRec); - trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit); - } // trackHit + trackParamAtHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->First()); + while (trackParamAtHit) { + track->AddHitForRecAtHit(trackParamAtHit->GetHitForRecPtr()); + trackParamAtHit = (AliMUONTrackParam*) (track->GetTrackParamAtHit()->After(trackParamAtHit)); + } track = (AliMUONTrack*) fRecTracksPtr->After(track); - } // track - return; -} - - //__________________________________________________________________________ -void AliMUONTrackReconstructor::FillMUONTrack() -{ - // Set track parameters at hits for Kalman track. Fill fTrackParamAtHit of AliMUONTrack's - AliMUONTrackK *track; - track = (AliMUONTrackK*) fRecTracksPtr->First(); - while (track) { - track->FillMUONTrack(); - track = (AliMUONTrackK*) fRecTracksPtr->After(track); - } + } return; } //__________________________________________________________________________ void AliMUONTrackReconstructor::EventDump(void) { - // Dump reconstructed event (track parameters at vertex and at first hit), - // and the particle parameters - + /// Dump reconstructed event (track parameters at vertex and at first hit), + /// and the particle parameters AliMUONTrack *track; AliMUONTrackParam *trackParam, *trackParam1; Double_t bendingSlope, nonBendingSlope, pYZ; Double_t pX, pY, pZ, x, y, z, c; - Int_t np, trackIndex, nTrackHits; + Int_t trackIndex, nTrackHits; AliDebug(1,"****** enter EventDump ******"); AliDebug(1, Form("Number of Reconstructed tracks : %d", fNRecTracks)); @@ -1528,7 +1005,6 @@ void AliMUONTrackReconstructor::EventDump(void) fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole // Loop over reconstructed tracks for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) { - if (fTrackMethod != 1) continue; //AZ - skip the rest for now AliDebug(1, Form("track number: %d", trackIndex)); // function for each track for modularity ???? track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]); @@ -1550,8 +1026,7 @@ void AliMUONTrackReconstructor::EventDump(void) z, x, y, pX, pY, pZ, c)); // track parameters at first hit - trackParam1 = ((AliMUONTrackHit*) - (track->GetTrackHitsPtr()->First()))->GetTrackParam(); + trackParam1 = (AliMUONTrackParam*) track->GetTrackParamAtHit()->First(); x = trackParam1->GetNonBendingCoor(); y = trackParam1->GetBendingCoor(); z = trackParam1->GetZ(); @@ -1565,9 +1040,7 @@ void AliMUONTrackReconstructor::EventDump(void) AliDebug(1, Form("track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n", z, x, y, pX, pY, pZ, c)); } - // informations about generated particles - np = gAlice->GetMCApp()->GetNtrack(); - printf(" **** number of generated particles: %d \n", np); + // informations about generated particles NO !!!!!!!! // for (Int_t iPart = 0; iPart < np; iPart++) { // p = gAlice->Particle(iPart); @@ -1578,281 +1051,3 @@ void AliMUONTrackReconstructor::EventDump(void) } -//__________________________________________________________________________ -void AliMUONTrackReconstructor::EventDumpTrigger(void) -{ - // Dump reconstructed trigger event - // and the particle parameters - - AliMUONTriggerTrack *triggertrack ; - Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast(); - - AliDebug(1, "****** enter EventDumpTrigger ******"); - AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks)); - - // Loop over reconstructed tracks - for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) { - triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex); - printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n", - trackIndex, - triggertrack->GetX11(),triggertrack->GetY11(), - triggertrack->GetThetax(),triggertrack->GetThetay()); - } -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::MakeTrackCandidatesK(void) -{ - // To make initial tracks for Kalman filter from the list of segments - Int_t istat, iseg; - AliMUONSegment *segment; - AliMUONTrackK *trackK; - - AliDebug(1,"Enter MakeTrackCandidatesK"); - - AliMUONTrackK a(this, fHitsForRecPtr); - // Loop over stations(1...) 5 and 4 - for (istat=4; istat>=3; istat--) { - // Loop over segments in the station - for (iseg=0; isegDebugLevel() > 0) { - for (Int_t i1=0; i1GetTTRTrack() > 1 || hit->GetTrackRefSignal() == 0) continue; - printf(" Hit # %d %10.4f %10.4f %10.4f", - hit->GetChamberNumber(), hit->GetBendingCoor(), - hit->GetNonBendingCoor(), hit->GetZ()); - if (fRecTrackRefHits) { - // from track ref hits - printf(" %3d %3d \n", hit->GetTrackRefSignal(), hit->GetTTRTrack()); - } else { - // from raw clusters - rawclusters = fMUONData->RawClusters(hit->GetChamberNumber()); - clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit-> - GetHitNumber()); - printf(" %d", clus->GetTrack(1)); - if (clus->GetTrack(2) != -1) printf(" %d \n", clus->GetTrack(2)); - else printf("\n"); - } // if (fRecTrackRefHits) - } - } // if (trackK->DebugLevel() > 0) - - icand = -1; - Int_t nSeeds; - nSeeds = fNRecTracks; // starting number of seeds - // Loop over track candidates - while (icand < fNRecTracks-1) { - icand ++; - if (trackK->DebugLevel()>0) cout << " *** Kalman track candidate No. " << icand << endl; - trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]); - if (trackK->GetRecover() < 0) continue; // failed track - - // Discard candidate which will produce the double track - /* - if (icand > 0) { - ok = CheckCandidateK(icand,nSeeds); - if (!ok) { - trackK->SetRecover(-1); // mark candidate to be removed - continue; - } - } - */ - - ok = kTRUE; - if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*) - trackK->GetTrackHits()->Last(); // last hit - else hit = trackK->GetHitLastOk(); // hit where track stopped - if (hit) ichamBeg = hit->GetChamberNumber(); - ichamEnd = 0; - // Check propagation direction - if (!hit) { ichamBeg = ichamEnd; AliFatal(" ??? "); } - else if (trackK->GetTrackDir() < 0) { - ichamEnd = 9; // forward propagation - ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2); - if (ok) { - ichamBeg = ichamEnd; - ichamEnd = 6; // backward propagation - // Change weight matrix and zero fChi2 for backpropagation - trackK->StartBack(); - trackK->SetTrackDir(1); - ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2); - ichamBeg = ichamEnd; - ichamEnd = 0; - } - } else { - if (trackK->GetBPFlag()) { - // backpropagation - ichamEnd = 6; // backward propagation - // Change weight matrix and zero fChi2 for backpropagation - trackK->StartBack(); - ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2); - ichamBeg = ichamEnd; - ichamEnd = 0; - } - } - - if (ok) { - trackK->SetTrackDir(1); - trackK->SetBPFlag(kFALSE); - ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2); - } - if (!ok) { trackK->SetRecover(-1); continue; } // mark candidate to be removed - - // Apply smoother - if (trackK->GetRecover() >= 0) { - ok = trackK->Smooth(); - if (!ok) trackK->SetRecover(-1); // mark candidate to be removed - } - - // Majority 3 of 4 in first 2 stations - if (!ok) continue; - chamBits = 0; - Double_t chi2max = 0; - for (Int_t i=0; iGetNTrackHits(); i++) { - hit = (AliMUONHitForRec*) (*trackK->GetTrackHits())[i]; - chamBits |= BIT(hit->GetChamberNumber()); - if (trackK->GetChi2PerPoint(i) > chi2max) chi2max = trackK->GetChi2PerPoint(i); - } - if (!((chamBits&3)==3 || (chamBits>>2&3)==3) && chi2max > 25) { - //trackK->Recover(); - trackK->SetRecover(-1); //mark candidate to be removed - continue; - } - if (ok) trackK->SetTrackQuality(0); // compute "track quality" - } // while - - for (Int_t i=0; iGetRecover() < 0) fRecTracksPtr->RemoveAt(i); - } - - // Compress TClonesArray - fRecTracksPtr->Compress(); - fNRecTracks = fRecTracksPtr->GetEntriesFast(); - return; -} - -//__________________________________________________________________________ -Bool_t AliMUONTrackReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds) const -{ - // Discards track candidate if it will produce the double track (having - // the same seed segment hits as hits of a good track found before) - AliMUONTrackK *track1, *track2; - AliMUONHitForRec *hit1, *hit2, *hit; - - track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]); - hit1 = (AliMUONHitForRec*) (*track1->GetTrackHits())[0]; // 1'st hit - hit2 = (AliMUONHitForRec*) (*track1->GetTrackHits())[1]; // 2'nd hit - - for (Int_t i=0; iGetRecover() < 0) continue; - if (track2->GetRecover() < 0 && icand >= nSeeds) continue; - - if (track1->GetStartSegment() == track2->GetStartSegment()) { - return kFALSE; - } else { - Int_t nSame = 0; - for (Int_t j=0; jGetNTrackHits(); j++) { - hit = (AliMUONHitForRec*) (*track2->GetTrackHits())[j]; - if (hit == hit1 || hit == hit2) { - nSame++; - if (nSame == 2) return kFALSE; - } - } // for (Int_t j=0; - } - } // for (Int_t i=0; - return kTRUE; -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::RemoveDoubleTracksK(void) -{ - // Removes double tracks (sharing more than half of their hits). Keeps - // the track with higher quality - AliMUONTrackK *track1, *track2, *trackToKill; - - // Sort tracks according to their quality - fRecTracksPtr->Sort(); - - // Loop over first track of the pair - track1 = (AliMUONTrackK*) fRecTracksPtr->First(); - Int_t debug = track1->DebugLevel(); - while (track1) { - // Loop over second track of the pair - track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1); - while (track2) { - // Check whether or not to keep track2 - if (!track2->KeepTrack(track1)) { - if (debug >= 0) cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) << - " " << track2->GetTrackQuality() << endl; - trackToKill = track2; - track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2); - trackToKill->Kill(); - fRecTracksPtr->Compress(); - } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2); - } // track2 - track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1); - } // track1 - - fNRecTracks = fRecTracksPtr->GetEntriesFast(); - if (debug >= 0) cout << " Number of Kalman tracks: " << fNRecTracks << endl; -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::GoToVertex(void) -{ - // Propagates track to the vertex thru absorber - // (using Branson correction for now) - - Double_t zVertex; - zVertex = 0; - for (Int_t i=0; iBranson(); - ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2 - //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber - ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(1); // with absorber - } -} - -//__________________________________________________________________________ -void AliMUONTrackReconstructor::SetTrackMethod(Int_t iTrackMethod) -{ - // Set track method and recreate track container if necessary - - fTrackMethod = TMath::Min (iTrackMethod, 3); - fTrackMethod = TMath::Max (fTrackMethod, 1); - if (fTrackMethod != 1) { - if (fRecTracksPtr) delete fRecTracksPtr; - fRecTracksPtr = new TClonesArray("AliMUONTrackK", 10); - if (fTrackMethod == 2) cout << " *** Tracking with the Kalman filter *** " << endl; - else cout << " *** Combined cluster / track finder ***" << endl; - } else cout << " *** Original tracking *** " << endl; - -}