--- /dev/null
+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * Contributors are mentioned in the code where appropriate. *
+ * *
+ * Permission to use, copy, modify and distribute this software and its *
+ * documentation strictly for non-commercial purposes is hereby granted *
+ * without fee, provided that the above copyright notice appears in all *
+ * copies and that both the copyright notice and this permission notice *
+ * appear in the supporting documentation. The authors make no claims *
+ * about the suitability of this software for any purpose. It is *
+ * provided "as is" without express or implied warranty. *
+ **************************************************************************/
+
+/* $Id$ */
+
+////////////////////////////////////
+//
+// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
+//
+// This class contains as data:
+// * a pointer to the array of hits to be reconstructed (the event)
+// * a pointer to the array of segments made with these hits inside each station
+// * a pointer to the array of reconstructed tracks
+//
+// It contains as methods, among others:
+// * EventReconstruct to build the muon tracks
+// * EventReconstructTrigger to build the trigger tracks
+//
+////////////////////////////////////
+
+#include <stdlib.h>
+#include <Riostream.h>
+#include <TTree.h>
+
+#include "AliMUONVTrackReconstructor.h"
+#include "AliMUONData.h"
+#include "AliMUONConstants.h"
+#include "AliMUONHitForRec.h"
+#include "AliMUONTriggerTrack.h"
+#include "AliMUONTriggerCircuitNew.h"
+#include "AliMUONLocalTrigger.h"
+#include "AliMUONGlobalTrigger.h"
+#include "AliMUONSegment.h"
+#include "AliMUONTrack.h"
+#include "AliMagF.h"
+#include "AliLog.h"
+#include "AliTracker.h"
+
+ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
+
+//************* Defaults parameters for reconstruction
+const Double_t AliMUONVTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
+const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
+const Double_t AliMUONVTrackReconstructor::fgkDefaultBendingResolution = 0.01;
+const Double_t AliMUONVTrackReconstructor::fgkDefaultNonBendingResolution = 0.144;
+const Double_t AliMUONVTrackReconstructor::fgkDefaultMaxSigma2Distance = 16.0;
+// Simple magnetic field:
+// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
+// Length and Position from reco_muon.F, with opposite sign:
+// Length = ZMAGEND-ZCOIL
+// Position = (ZMAGEND+ZCOIL)/2
+// to be ajusted differently from real magnetic field ????
+const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBValue = 7.0;
+const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBLength = 428.0;
+const Double_t AliMUONVTrackReconstructor::fgkDefaultSimpleBPosition = 1019.0;
+
+//__________________________________________________________________________
+AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(AliMUONData* data)
+ : TObject(),
+ fMinBendingMomentum(fgkDefaultMinBendingMomentum),
+ fMaxBendingMomentum(fgkDefaultMaxBendingMomentum),
+ fBendingResolution(fgkDefaultBendingResolution),
+ fNonBendingResolution(fgkDefaultNonBendingResolution),
+ fMaxSigma2Distance(fgkDefaultMaxSigma2Distance),
+ fChamberThicknessInX0(AliMUONConstants::DefaultChamberThicknessInX0()),
+ fSimpleBValue(fgkDefaultSimpleBValue),
+ fSimpleBLength(fgkDefaultSimpleBLength),
+ fSimpleBPosition(fgkDefaultSimpleBPosition),
+ fSegmentMaxDistBending(0x0),
+ fSegmentMaxDistNonBending(0x0),
+ fHitsForRecPtr(0x0),
+ fNHitsForRec(0),
+ fNHitsForRecPerChamber(0x0),
+ fIndexOfFirstHitForRecPerChamber(0x0),
+ fSegmentsPtr(0x0),
+ fNSegments(0x0),
+ fRecTracksPtr(0x0),
+ fNRecTracks(0),
+ fMUONData(data),
+ fTriggerTrack(new AliMUONTriggerTrack()),
+ fTriggerCircuit(0x0)
+{
+ /// Constructor for class AliMUONVTrackReconstructor
+ fSegmentMaxDistBending = new Double_t[AliMUONConstants::NTrackingSt()];
+ fSegmentMaxDistNonBending = new Double_t[AliMUONConstants::NTrackingSt()];
+ fNHitsForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
+ fIndexOfFirstHitForRecPerChamber = new Int_t[AliMUONConstants::NTrackingCh()];
+
+ SetReconstructionParametersToDefaults();
+
+ // Memory allocation for the TClonesArray of hits for reconstruction
+ // Is 10000 the right size ????
+ fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
+
+ // Memory allocation for the TClonesArray's of segments in stations
+ // Is 2000 the right size ????
+ fSegmentsPtr = new TClonesArray*[AliMUONConstants::NTrackingSt()];
+ fNSegments = new Int_t[AliMUONConstants::NTrackingSt()];
+ for (Int_t st = 0; st < AliMUONConstants::NTrackingSt(); st++) {
+ fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
+ fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
+ }
+
+ const AliMagF* kField = AliTracker::GetFieldMap();
+ if (!kField) AliFatal("No field available");
+ // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
+ Float_t b[3], x[3];
+ x[0] = 50.; x[1] = 50.; x[2] = -950.;
+ kField->Field(x,b);
+
+ fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
+ fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
+ // See how to get fSimple(BValue, BLength, BPosition)
+ // automatically calculated from the actual magnetic field ????
+}
+
+ //__________________________________________________________________________
+AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor(void)
+{
+ /// Destructor for class AliMUONVTrackReconstructor
+ delete [] fSegmentMaxDistBending;
+ delete [] fSegmentMaxDistNonBending;
+ delete [] fNHitsForRecPerChamber;
+ delete [] fIndexOfFirstHitForRecPerChamber;
+ delete fTriggerTrack;
+ delete fHitsForRecPtr;
+ // Correct destruction of everything ????
+ for (Int_t st = 0; st < AliMUONConstants::NTrackingSt(); st++) delete fSegmentsPtr[st];
+ delete [] fSegmentsPtr;
+ delete [] fNSegments;
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::SetReconstructionParametersToDefaults(void)
+{
+ /// Set reconstruction parameters for making segments to default values
+ // Would be much more convenient with a structure (or class) ????
+
+ // ******** Parameters for making segments
+ // should be parametrized ????
+ // according to interval between chambers in a station ????
+ // Maximum distance in non bending plane
+ // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
+ // SIGCUT*DYMAX(IZ)
+ for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++)
+ fSegmentMaxDistNonBending[st] = 5. * 0.22;
+ // Maximum distance in bending plane:
+ // values from TRACKF_STAT, corresponding to (J psi 20cm),
+ // scaled to the real distance between chambers in a station
+ fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
+ (AliMUONConstants::DefaultChamberZ(1) - AliMUONConstants::DefaultChamberZ(0)) / 20.0);
+ fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
+ (AliMUONConstants::DefaultChamberZ(3) - AliMUONConstants::DefaultChamberZ(2)) / 20.0);
+ fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
+ (AliMUONConstants::DefaultChamberZ(5) - AliMUONConstants::DefaultChamberZ(4)) / 20.0);
+ fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
+ (AliMUONConstants::DefaultChamberZ(7) - AliMUONConstants::DefaultChamberZ(6)) / 20.0);
+ fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
+ (AliMUONConstants::DefaultChamberZ(9) - AliMUONConstants::DefaultChamberZ(8)) / 20.0);
+
+ return;
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::EventReconstruct(void)
+{
+ // To reconstruct one event
+ AliDebug(1,"Enter EventReconstruct");
+ ResetTracks(); //AZ
+ ResetSegments(); //AZ
+ ResetHitsForRec(); //AZ
+ AddHitsForRecFromRawClusters();
+ MakeSegments();
+ MakeTracks();
+ if (fMUONData->IsTriggerTrackBranchesInTree())
+ ValidateTracksWithTrigger();
+
+ // Add tracks to MUON data container
+ for(Int_t i=0; i<fNRecTracks; i++) {
+ AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
+ fMUONData->AddRecTrack(*track);
+ }
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::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 AliMUONVTrackReconstructor::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 AliMUONVTrackReconstructor::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->Delete();
+ fNHitsForRec = 0;
+ for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
+ fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
+ return;
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::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;
+}
+
+ //__________________________________________________________________________
+void AliMUONVTrackReconstructor::MakeSegmentsPerStation(Int_t Station)
+{
+ /// To make the list of segments in station number "Station" (0...)
+ /// from the list of hits to be reconstructed.
+ /// Updates "fNSegments"[Station].
+ /// Segments in stations 4 and 5 are sorted
+ /// according to increasing absolute value of "impact parameter"
+ 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
+ if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0.0 ) {
+ bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
+ (hit1Ptr->GetZ() - hit2Ptr->GetZ());
+ // absolute value of impact parameter
+ impactParam =
+ TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
+ }
+ else {
+ AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): impactParam set to maxImpactParam");
+ impactParam = maxImpactParam;
+ }
+ }
+ // check for distances not too large,
+ // and impact parameter not too big if stations downstream of the dipole.
+ // Conditions "distBend" and "impactParam" correlated for these stations ????
+ if ((distBend < fSegmentMaxDistBending[Station]) &&
+ (distNonBend < fSegmentMaxDistNonBending[Station]) &&
+ (!last2st || (impactParam < maxImpactParam)) &&
+ (!last2st || (impactParam > minImpactParam))) {
+ // make new segment
+ segment = new ((*fSegmentsPtr[Station])[segmentIndex])
+ AliMUONSegment(hit1Ptr, hit2Ptr);
+ // update "link" to this segment from the hit in the first chamber
+ if (hit1Ptr->GetNSegments() == 0)
+ hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
+ hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
+ if (AliLog::GetGlobalDebugLevel() > 1) {
+ cout << "segmentIndex(0...): " << segmentIndex
+ << " distBend: " << distBend
+ << " distNonBend: " << distNonBend
+ << endl;
+ segment->Dump();
+ cout << "HitForRec in first chamber" << endl;
+ hit1Ptr->Dump();
+ cout << "HitForRec in second chamber" << endl;
+ hit2Ptr->Dump();
+ };
+ // increment index for current segment
+ segmentIndex++;
+ }
+ } //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]));
+ return;
+}
+
+ //__________________________________________________________________________
+Double_t AliMUONVTrackReconstructor::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 AliMUONVTrackReconstructor::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 AliMUONVTrackReconstructor::ValidateTracksWithTrigger(void)
+{
+ /// Try to match track from tracking system with trigger track
+ AliMUONTrack *track;
+ AliMUONTrackParam trackParam;
+ AliMUONTriggerTrack *triggerTrack;
+
+ fMUONData->SetTreeAddress("RL");
+ fMUONData->GetRecTriggerTracks();
+ TClonesArray *recTriggerTracks = fMUONData->RecTriggerTracks();
+
+ Bool_t matchTrigger;
+ Double_t distSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
+ Double_t distTriggerTrack[3];
+ Double_t chi2MatchTrigger, xTrack, yTrack, ySlopeTrack, dTrigTrackMin2, dTrigTrack2 = 0.;
+
+ track = (AliMUONTrack*) fRecTracksPtr->First();
+ while (track) {
+ matchTrigger = kFALSE;
+ chi2MatchTrigger = 0.;
+
+ trackParam = *((AliMUONTrackParam*) (track->GetTrackParamAtHit()->Last()));
+ trackParam.ExtrapToZ(AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
+
+ xTrack = trackParam.GetNonBendingCoor();
+ yTrack = trackParam.GetBendingCoor();
+ ySlopeTrack = trackParam.GetBendingSlope();
+ dTrigTrackMin2 = 999.;
+
+ triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->First();
+ while(triggerTrack){
+ distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/distSigma[0];
+ distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/distSigma[1];
+ distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/distSigma[2];
+ dTrigTrack2 = 0.;
+ for (Int_t iVar = 0; iVar < 3; iVar++) dTrigTrack2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
+ if (dTrigTrack2 < dTrigTrackMin2 && dTrigTrack2 < fMaxSigma2Distance) {
+ dTrigTrackMin2 = dTrigTrack2;
+ matchTrigger = kTRUE;
+ chi2MatchTrigger = dTrigTrack2/3.; // Normalized Chi2, 3 variables (X,Y,slopeY)
+ }
+ triggerTrack = (AliMUONTriggerTrack*) recTriggerTracks->After(triggerTrack);
+ }
+
+ track->SetMatchTrigger(matchTrigger);
+ track->SetChi2MatchTrigger(chi2MatchTrigger);
+
+ track = (AliMUONTrack*) fRecTracksPtr->After(track);
+ }
+
+ return;
+}
+
+//__________________________________________________________________________
+void AliMUONVTrackReconstructor::EventReconstructTrigger(void)
+{
+ /// To reconstruct trigger for one event
+ AliDebug(1,"Enter EventReconstructTrigger");
+ MakeTriggerTracks();
+ return;
+}
+
+ //__________________________________________________________________________
+Bool_t AliMUONVTrackReconstructor::MakeTriggerTracks(void)
+{
+ // To make the trigger tracks from Local Trigger
+ AliDebug(1, "Enter MakeTriggerTracks");
+
+ Int_t nTRentries;
+ UChar_t gloTrigPat;
+ TClonesArray *localTrigger;
+ TClonesArray *globalTrigger;
+ AliMUONLocalTrigger *locTrg;
+ AliMUONGlobalTrigger *gloTrg;
+
+ TTree* treeR = fMUONData->TreeR();
+
+ 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;
+ }
+
+ fMUONData->SetTreeAddress("TC");
+ fMUONData->GetTrigger();
+
+ // global trigger for trigger pattern
+ gloTrigPat = 0;
+ globalTrigger = fMUONData->GlobalTrigger();
+ gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
+
+ if (gloTrg)
+ gloTrigPat = gloTrg->GetGlobalResponse();
+
+
+ // local trigger for tracking
+ localTrigger = fMUONData->LocalTrigger();
+ Int_t nlocals = (Int_t) (localTrigger->GetEntries());
+
+ Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
+ Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
+
+ Float_t y11 = 0.;
+ Int_t stripX21 = 0;
+ Float_t y21 = 0.;
+ Float_t x11 = 0.;
+
+ for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
+ locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
+
+ AliDebug(1, "AliMUONTrackReconstructor::MakeTriggerTrack using NEW trigger \n");
+ AliMUONTriggerCircuitNew* circuit =
+ (AliMUONTriggerCircuitNew*)fTriggerCircuit->At(locTrg->LoCircuit()-1); // -1 !!!
+
+ y11 = circuit->GetY11Pos(locTrg->LoStripX());
+ stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
+ y21 = circuit->GetY21Pos(stripX21);
+ x11 = circuit->GetX11Pos(locTrg->LoStripY());
+
+ AliDebug(1, Form(" MakeTriggerTrack %d %d %d %d %d %f %f %f \n",i,locTrg->LoCircuit(),
+ locTrg->LoStripX(),locTrg->LoStripX()+locTrg->LoDev()+1,locTrg->LoStripY(),y11, y21, x11));
+
+ Float_t thetax = TMath::ATan2( x11 , z11 );
+ Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
+
+ fTriggerTrack->SetX11(x11);
+ fTriggerTrack->SetY11(y11);
+ fTriggerTrack->SetThetax(thetax);
+ fTriggerTrack->SetThetay(thetay);
+ fTriggerTrack->SetGTPattern(gloTrigPat);
+
+ fMUONData->AddRecTriggerTrack(*fTriggerTrack);
+ } // end of loop on Local Trigger
+ return kTRUE;
+}
+
+//__________________________________________________________________________
+void AliMUONVTrackReconstructor::EventDumpTrigger(void)
+{
+ /// Dump reconstructed trigger event
+ /// and the particle parameters
+ AliMUONTriggerTrack *triggertrack ;
+ Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
+
+ AliDebug(1, "****** enter EventDumpTrigger ******");
+ AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks));
+
+ // Loop over reconstructed tracks
+ for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
+ triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
+ printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
+ trackIndex,
+ triggertrack->GetX11(),triggertrack->GetY11(),
+ triggertrack->GetThetax(),triggertrack->GetThetay());
+ }
+}
+
--- /dev/null
+#ifndef ALIMUONVTRACKRECONSTRUCTOR_H
+#define ALIMUONVTRACKRECONSTRUCTOR_H
+/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * See cxx source for full Copyright notice */
+
+/* $Id$ */
+
+/// \ingroup rec
+/// \class AliMUONVTrackReconstructor
+/// \brief Virtual class for the MUON track reconstruction
+///
+/////////////////////////////////////////////
+/// Virtual MUON track reconstructor in ALICE
+/////////////////////////////////////////////
+
+#include <TObject.h>
+
+class TClonesArray;
+class AliMUONData;
+class AliMUONTriggerTrack;
+
+class AliMUONVTrackReconstructor : public TObject {
+
+ public:
+ AliMUONVTrackReconstructor(AliMUONData* data); // default Constructor
+ virtual ~AliMUONVTrackReconstructor(); // Destructor
+
+ // Parameters for track reconstruction: public methods
+ // Get and Set, Set to defaults
+ /// Return minimum value (GeV/c) of momentum in bending plane
+ Double_t GetMinBendingMomentum(void) const {return fMinBendingMomentum;}
+ /// Return chamber resolution (cm) in bending plane
+ Double_t GetBendingResolution(void) const {return fBendingResolution;}
+ /// Return chamber resolution (cm) in non-bending plane
+ Double_t GetNonBendingResolution(void) const {return fNonBendingResolution;}
+ /// Return chamber thickness in number of radiation lengths
+ Double_t GetChamberThicknessInX0(void) const {return fChamberThicknessInX0;}
+
+ // Reconstructed tracks
+ /// Return number of reconstructed tracks
+ Int_t GetNRecTracks() const {return fNRecTracks;} // Number
+ /// Set number of reconstructed tracks
+ void SetNRecTracks(Int_t NRecTracks) {fNRecTracks = NRecTracks;}
+ /// Return array of reconstructed tracks
+ TClonesArray* GetRecTracksPtr(void) const {return fRecTracksPtr;} // Array
+
+ // Functions
+ void EventReconstruct(void);
+ void EventReconstructTrigger(void);
+ virtual void EventDump(void) = 0; // dump reconstructed event
+ void EventDumpTrigger(void); // dump reconstructed trigger event
+
+ // needed in MakeSegmentsPerStation !!!
+ Double_t GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const;
+ Double_t GetBendingMomentumFromImpactParam(Double_t ImpactParam) const;
+
+ /// Return MUON data
+ AliMUONData* GetMUONData() {return fMUONData;}
+
+ /// Set trigger circuit
+ void SetTriggerCircuit(TClonesArray* circuit) {fTriggerCircuit = circuit;}
+
+
+ protected:
+
+ // Defaults parameters for reconstruction
+ static const Double_t fgkDefaultMinBendingMomentum; ///< default min. bending momentum for reconstruction
+ static const Double_t fgkDefaultMaxBendingMomentum; ///< default max. bending momentum for reconstruction
+ static const Double_t fgkDefaultBendingResolution; ///< default bending coordinate resolution for reconstruction
+ static const Double_t fgkDefaultNonBendingResolution; ///< default non bending coordinate resolution for reconstruction
+ static const Double_t fgkDefaultMaxSigma2Distance; ///< default square of max. distance for window size
+ // 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 ????
+ static const Double_t fgkDefaultSimpleBValue; ///< default value of magnetic field (dipole)
+ static const Double_t fgkDefaultSimpleBLength; ///< default length of magnetic field (dipole)
+ static const Double_t fgkDefaultSimpleBPosition; ///< default position of magnetic field (dipole)
+
+ // Parameters for track reconstruction
+ Double_t fMinBendingMomentum; ///< minimum value (GeV/c) of momentum in bending plane
+ Double_t fMaxBendingMomentum; ///< maximum value (GeV/c) of momentum in bending plane
+ Double_t fBendingResolution; ///< chamber resolution (cm) in bending plane
+ Double_t fNonBendingResolution; ///< chamber resolution (cm) in non bending plane
+ Double_t fMaxSigma2Distance; ///< maximum square distance in units of the variance (maximum chi2)
+ Double_t fChamberThicknessInX0; ///< chamber thickness in number of radiation lengths
+ Double_t fSimpleBValue; ///< simple magnetic field: value (kG)
+ Double_t fSimpleBLength; ///< simple magnetic field: length (cm)
+ Double_t fSimpleBPosition; ///< simple magnetic field: Z central position (cm)
+
+ Double_t* fSegmentMaxDistBending; ///< maximum distance (cm) for segments in bending plane
+ Double_t* fSegmentMaxDistNonBending; ///< maximum distance (cm) for segments in non bending plane
+
+ // Hits for reconstruction (should be in AliMUON ????)
+ TClonesArray* fHitsForRecPtr; ///< pointer to the array of hits for reconstruction
+ Int_t fNHitsForRec; ///< number of hits for reconstruction
+ // Information per chamber (should be in AliMUONChamber ????)
+ Int_t* fNHitsForRecPerChamber; ///< number of HitsForRec
+ Int_t* fIndexOfFirstHitForRecPerChamber; ///< index (0...) of first HitForRec
+
+ // Segments inside a station
+ TClonesArray** fSegmentsPtr; ///< array of pointers to the segments for each station
+ Int_t* fNSegments; ///< number of segments for each station
+
+ // Reconstructed tracks
+ TClonesArray *fRecTracksPtr; ///< pointer to array of reconstructed tracks
+ Int_t fNRecTracks; ///< number of reconstructed tracks
+
+ // data container
+ AliMUONData* fMUONData; ///< Data container for MUON subsystem
+
+ // Functions
+ AliMUONVTrackReconstructor (const AliMUONVTrackReconstructor& rhs); ///< copy constructor
+ AliMUONVTrackReconstructor& operator=(const AliMUONVTrackReconstructor& rhs); ///< assignment operator
+
+ void SortHitsForRecWithIncreasingChamber();
+ void MakeSegmentsPerStation(Int_t Station);
+
+ virtual void AddHitsForRecFromRawClusters() = 0;
+ virtual void MakeSegments(void) = 0;
+ virtual void MakeTracks(void) = 0;
+ virtual void MakeTrackCandidates(void) = 0;
+ virtual void FollowTracks(void) = 0;
+ virtual void RemoveDoubleTracks(void) = 0;
+
+ private:
+
+ AliMUONTriggerTrack* fTriggerTrack; ///< Trigger track structure
+
+ TClonesArray* fTriggerCircuit; //!< trigger circuit array
+
+ // Functions
+ void SetReconstructionParametersToDefaults(void);
+
+ void ResetTracks(void);
+ void ResetSegments(void);
+ void ResetHitsForRec(void);
+
+ void ValidateTracksWithTrigger(void);
+
+ Bool_t MakeTriggerTracks(void);
+
+
+ ClassDef(AliMUONVTrackReconstructor, 0) // MUON track reconstructor in ALICE
+ };
+
+#endif
git://git.uio.no / u/mrichter/AliRoot.git / commitdiff