-//____________________________________________________________________
-//
-// AliITSMultReconstructor - find clusters in the pixels (theta and
-// phi) and tracklets.
+/**************************************************************************
+ * Copyright(c) 2007-2009, 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. *
+ **************************************************************************/
+
+/* $Id$ */
+
+//_________________________________________________________________________
//
-// These can be used to extract charged particles multiplcicity from the ITS.
+// Implementation of the ITS-SPD trackleter class
//
-// A tracklet consist of two ITS clusters, one in the first pixel
-// layer and one in the second. The clusters are associates if the
-// differencies in Phi (azimuth) and Zeta (longitudinal) are inside
-// a fiducial volume. In case of multiple candidates it is selected the
-// candidate with minimum distance in Phi.
-// The parameter AssociationChoice allows to control if two clusters
-// in layer 2 can be associated to the same cluster in layer 1 or not.
+// It retrieves clusters in the pixels (theta and phi) and finds tracklets.
+// These can be used to extract charged particle multiplicity from the ITS.
//
-// -----------------------------------------------------------------
-//
-// NOTE: The cuts on phi and zeta depends on the interacting system (p-p
-// or Pb-Pb). Please, check the file AliITSMultReconstructor.h and be
-// sure that SetPhiWindow and SetZetaWindow are defined accordingly.
+// A tracklet consists of two ITS clusters, one in the first pixel layer and
+// one in the second. The clusters are associated if the differences in
+// Phi (azimuth) and Theta (polar angle) are within fiducial windows.
+// In case of multiple candidates the candidate with minimum
+// distance is selected.
+//
+// Two methods return the number of tracklets and the number of unassociated
+// clusters (i.e. not used in any tracklet) in the first SPD layer
+// (GetNTracklets and GetNSingleClusters)
+//
+// The cuts on phi and theta depend on the interacting system (p-p or Pb-Pb)
+// and can be set via AliITSRecoParam class
+// (SetPhiWindow and SetThetaWindow)
//
-//
-//
+// Origin: Tiziano Virgili
//
-//____________________________________________________________________
+// Current support and development:
+// Domenico Elia, Maria Nicassio (INFN Bari)
+// Domenico.Elia@ba.infn.it, Maria.Nicassio@ba.infn.it
+//
+// Most recent updates:
+// - multiple association forbidden (fOnlyOneTrackletPerC2 = kTRUE)
+// - phi definition changed to ALICE convention (0,2*TMath::pi())
+// - cluster coordinates taken with GetGlobalXYZ()
+// - fGeometry removed
+// - number of fired chips on the two layers
+// - option to cut duplicates in the overlaps
+// - options and fiducial cuts via AliITSRecoParam
+// - move from DeltaZeta to DeltaTheta cut
+// - update to the new algorithm by Mariella and Jan Fiete
+// - store also DeltaTheta in the ESD
+// - less new and delete calls when creating the needed arrays
+//_________________________________________________________________________
+
+#include <TClonesArray.h>
+#include <TH1F.h>
+#include <TH2F.h>
+#include <TTree.h>
+#include "TArrayI.h"
#include "AliITSMultReconstructor.h"
-
-#include "TTree.h"
-#include "TH1F.h"
-#include "TH2F.h"
-
+#include "AliITSReconstructor.h"
+#include "AliITSsegmentationSPD.h"
#include "AliITSRecPoint.h"
+#include "AliITSRecPointContainer.h"
#include "AliITSgeom.h"
+#include "AliITSgeomTGeo.h"
#include "AliLog.h"
+#include "TGeoGlobalMagField.h"
+#include "AliMagF.h"
//____________________________________________________________________
ClassImp(AliITSMultReconstructor)
//____________________________________________________________________
AliITSMultReconstructor::AliITSMultReconstructor():
-fGeometry(0),
+TObject(),
fClustersLay1(0),
fClustersLay2(0),
+fDetectorIndexClustersLay1(0),
+fDetectorIndexClustersLay2(0),
+fOverlapFlagClustersLay1(0),
+fOverlapFlagClustersLay2(0),
fTracklets(0),
-fAssociationFlag(0),
+fSClusters(0),
fNClustersLay1(0),
fNClustersLay2(0),
fNTracklets(0),
+fNSingleCluster(0),
fPhiWindow(0),
-fZetaWindow(0),
-fOnlyOneTrackletPerC2(0),
+fThetaWindow(0),
+fPhiShift(0),
+fRemoveClustersFromOverlaps(0),
+fPhiOverlapCut(0),
+fZetaOverlapCut(0),
fHistOn(0),
fhClustersDPhiAcc(0),
fhClustersDThetaAcc(0),
-fhClustersDZetaAcc(0),
fhClustersDPhiAll(0),
fhClustersDThetaAll(0),
-fhClustersDZetaAll(0),
fhDPhiVsDThetaAll(0),
fhDPhiVsDThetaAcc(0),
-fhDPhiVsDZetaAll(0),
-fhDPhiVsDZetaAcc(0),
fhetaTracklets(0),
fhphiTracklets(0),
fhetaClustersLay1(0),
fhphiClustersLay1(0){
+
+ fNFiredChips[0] = 0;
+ fNFiredChips[1] = 0;
+
// Method to reconstruct the charged particles multiplicity with the
// SPD (tracklets).
- fGeometry =0;
SetHistOn();
- SetPhiWindow();
- SetZetaWindow();
- SetOnlyOneTrackletPerC2();
-
- fClustersLay1 = new Float_t*[300000];
- fClustersLay2 = new Float_t*[300000];
- fTracklets = new Float_t*[300000];
- fAssociationFlag = new Bool_t[300000];
-
- for(Int_t i=0; i<300000; i++) {
- fClustersLay1[i] = new Float_t[3];
- fClustersLay2[i] = new Float_t[3];
- fTracklets[i] = new Float_t[3];
- fAssociationFlag[i] = kFALSE;
- }
+
+ if(AliITSReconstructor::GetRecoParam()) {
+ SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow());
+ SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow());
+ SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift());
+ SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps());
+ SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut());
+ SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut());
+ } else {
+ SetPhiWindow();
+ SetThetaWindow();
+ SetPhiShift();
+ SetRemoveClustersFromOverlaps();
+ SetPhiOverlapCut();
+ SetZetaOverlapCut();
+ }
+
+
+ fClustersLay1 = 0;
+ fClustersLay2 = 0;
+ fDetectorIndexClustersLay1 = 0;
+ fDetectorIndexClustersLay2 = 0;
+ fOverlapFlagClustersLay1 = 0;
+ fOverlapFlagClustersLay2 = 0;
+ fTracklets = 0;
+ fSClusters = 0;
// definition of histograms
+ Bool_t oldStatus = TH1::AddDirectoryStatus();
+ TH1::AddDirectory(kFALSE);
+
fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1);
- fhClustersDPhiAcc->SetDirectory(0);
fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1);
- fhClustersDThetaAcc->SetDirectory(0);
- fhClustersDZetaAcc = new TH1F("dzetaacc","dzeta",100,-1.,1.);
- fhClustersDZetaAcc->SetDirectory(0);
- fhDPhiVsDZetaAcc = new TH2F("dphiVsDzetaacc","",100,-1.,1.,100,-0.1,0.1);
- fhDPhiVsDZetaAcc->SetDirectory(0);
fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1);
- fhDPhiVsDThetaAcc->SetDirectory(0);
- fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,-0.5,0.5);
- fhClustersDPhiAll->SetDirectory(0);
- fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,-0.5,0.5);
- fhClustersDThetaAll->SetDirectory(0);
- fhClustersDZetaAll = new TH1F("dzetaall","dzeta",100,-5.,5.);
- fhClustersDZetaAll->SetDirectory(0);
+ fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5);
+ fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5);
- fhDPhiVsDZetaAll = new TH2F("dphiVsDzetaall","",100,-5.,5.,100,-0.5,0.5);
- fhDPhiVsDZetaAll->SetDirectory(0);
- fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,-0.5,0.5,100,-0.5,0.5);
- fhDPhiVsDThetaAll->SetDirectory(0);
+ fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5);
fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.);
- fhphiTracklets = new TH1F("phiTracklets", "phi", 100,-3.14159,3.14159);
+ fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi());
fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.);
- fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100,-3.141,3.141);
-
+ fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi());
+
+ TH1::AddDirectory(oldStatus);
}
//______________________________________________________________________
AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) : TObject(mr),
-fGeometry(mr.fGeometry),
fClustersLay1(mr.fClustersLay1),
fClustersLay2(mr.fClustersLay2),
+fDetectorIndexClustersLay1(mr.fDetectorIndexClustersLay1),
+fDetectorIndexClustersLay2(mr.fDetectorIndexClustersLay2),
+fOverlapFlagClustersLay1(mr.fOverlapFlagClustersLay1),
+fOverlapFlagClustersLay2(mr.fOverlapFlagClustersLay2),
fTracklets(mr.fTracklets),
-fAssociationFlag(mr.fAssociationFlag),
+fSClusters(mr.fSClusters),
fNClustersLay1(mr.fNClustersLay1),
fNClustersLay2(mr.fNClustersLay2),
fNTracklets(mr.fNTracklets),
+fNSingleCluster(mr.fNSingleCluster),
fPhiWindow(mr.fPhiWindow),
-fZetaWindow(mr.fZetaWindow),
-fOnlyOneTrackletPerC2(mr.fOnlyOneTrackletPerC2),
+fThetaWindow(mr.fThetaWindow),
+fPhiShift(mr.fPhiShift),
+fRemoveClustersFromOverlaps(mr.fRemoveClustersFromOverlaps),
+fPhiOverlapCut(mr.fPhiOverlapCut),
+fZetaOverlapCut(mr.fZetaOverlapCut),
fHistOn(mr.fHistOn),
fhClustersDPhiAcc(mr.fhClustersDPhiAcc),
fhClustersDThetaAcc(mr.fhClustersDThetaAcc),
-fhClustersDZetaAcc(mr.fhClustersDZetaAcc),
fhClustersDPhiAll(mr.fhClustersDPhiAll),
fhClustersDThetaAll(mr.fhClustersDThetaAll),
-fhClustersDZetaAll(mr.fhClustersDZetaAll),
fhDPhiVsDThetaAll(mr.fhDPhiVsDThetaAll),
fhDPhiVsDThetaAcc(mr.fhDPhiVsDThetaAcc),
-fhDPhiVsDZetaAll(mr.fhDPhiVsDZetaAll),
-fhDPhiVsDZetaAcc(mr.fhDPhiVsDZetaAcc),
fhetaTracklets(mr.fhetaTracklets),
fhphiTracklets(mr.fhphiTracklets),
fhetaClustersLay1(mr.fhetaClustersLay1),
// delete histograms
delete fhClustersDPhiAcc;
delete fhClustersDThetaAcc;
- delete fhClustersDZetaAcc;
delete fhClustersDPhiAll;
delete fhClustersDThetaAll;
- delete fhClustersDZetaAll;
delete fhDPhiVsDThetaAll;
delete fhDPhiVsDThetaAcc;
- delete fhDPhiVsDZetaAll;
- delete fhDPhiVsDZetaAcc;
delete fhetaTracklets;
delete fhphiTracklets;
delete fhetaClustersLay1;
delete fhphiClustersLay1;
// delete arrays
- for(Int_t i=0; i<300000; i++) {
+ for(Int_t i=0; i<fNClustersLay1; i++)
delete [] fClustersLay1[i];
+
+ for(Int_t i=0; i<fNClustersLay2; i++)
delete [] fClustersLay2[i];
+
+ for(Int_t i=0; i<fNTracklets; i++)
delete [] fTracklets[i];
- }
+
+ for(Int_t i=0; i<fNSingleCluster; i++)
+ delete [] fSClusters[i];
+
delete [] fClustersLay1;
delete [] fClustersLay2;
+ delete [] fDetectorIndexClustersLay1;
+ delete [] fDetectorIndexClustersLay2;
+ delete [] fOverlapFlagClustersLay1;
+ delete [] fOverlapFlagClustersLay2;
delete [] fTracklets;
-
- delete [] fAssociationFlag;
+ delete [] fSClusters;
}
//____________________________________________________________________
-void
-AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
+void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) {
//
// - calls LoadClusterArray that finds the position of the clusters
// (in global coord)
// - convert the cluster coordinates to theta, phi (seen from the
- // interaction vertex). The third coordinate is used for ....
+ // interaction vertex).
// - makes an array of tracklets
//
// After this method has been called, the clusters of the two layers
fNClustersLay1 = 0;
fNClustersLay2 = 0;
fNTracklets = 0;
+ fNSingleCluster = 0;
// loading the clusters
LoadClusterArrays(clusterTree);
+ const Double_t pi = TMath::Pi();
+
+ // dPhi shift is field dependent
+ // get average magnetic field
+ Float_t bz = 0;
+ AliMagF* field = 0;
+ if (TGeoGlobalMagField::Instance())
+ field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
+ if (!field)
+ {
+ AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor.")
+ }
+ else
+ bz = TMath::Abs(field->SolenoidField());
+
+ const Double_t dPhiShift = fPhiShift / 5 * bz;
+ AliDebug(1, Form("Using phi shift of %f", dPhiShift));
+
+ const Double_t dPhiWindow2 = fPhiWindow * fPhiWindow;
+ const Double_t dThetaWindow2 = fThetaWindow * fThetaWindow;
+
+ Int_t* partners = new Int_t[fNClustersLay2];
+ Float_t* minDists = new Float_t[fNClustersLay2];
+ Int_t* associatedLay1 = new Int_t[fNClustersLay1];
+ TArrayI** blacklist = new TArrayI*[fNClustersLay1];
+
+ for (Int_t i=0; i<fNClustersLay2; i++) {
+ partners[i] = -1;
+ minDists[i] = 2;
+ }
+ for (Int_t i=0; i<fNClustersLay1; i++)
+ associatedLay1[i] = 0;
+ for (Int_t i=0; i<fNClustersLay1; i++)
+ blacklist[i] = 0;
+
// find the tracklets
AliDebug(1,"Looking for tracklets... ");
-
+
//###########################################################
// Loop on layer 1 : finding theta, phi and z
for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
Float_t y = fClustersLay1[iC1][1] - vtx[1];
Float_t z = fClustersLay1[iC1][2] - vtx[2];
- Float_t r = TMath::Sqrt(TMath::Power(x,2) +
- TMath::Power(y,2) +
- TMath::Power(z,2));
+ Float_t r = TMath::Sqrt(x*x + y*y + z*z);
+
+ fClustersLay1[iC1][0] = TMath::ACos(z/r); // Store Theta
+ fClustersLay1[iC1][1] = TMath::Pi() + TMath::ATan2(-y,-x); // Store Phi
- fClustersLay1[iC1][0] = TMath::ACos(z/r); // Store Theta
- fClustersLay1[iC1][1] = TMath::ATan2(x,y); // Store Phi
- fClustersLay1[iC1][2] = z/r; // Store scaled z
if (fHistOn) {
Float_t eta=fClustersLay1[iC1][0];
eta= TMath::Tan(eta/2.);
eta=-TMath::Log(eta);
fhetaClustersLay1->Fill(eta);
- fhphiClustersLay1->Fill(fClustersLay1[iC1][1]);
+ fhphiClustersLay1->Fill(fClustersLay1[iC1][1]);
}
-}
+ }
// Loop on layer 2 : finding theta, phi and r
for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
Float_t y = fClustersLay2[iC2][1] - vtx[1];
Float_t z = fClustersLay2[iC2][2] - vtx[2];
- Float_t r = TMath::Sqrt(TMath::Power(x,2) +
- TMath::Power(y,2) +
- TMath::Power(z,2));
+ Float_t r = TMath::Sqrt(x*x + y*y + z*z);
- fClustersLay2[iC2][0] = TMath::ACos(z/r); // Store Theta
- fClustersLay2[iC2][1] = TMath::ATan2(x,y); // Store Phi
- fClustersLay2[iC2][2] = z; // Store z
-
- // this only needs to be initialized for the fNClustersLay2 first associations
- fAssociationFlag[iC2] = kFALSE;
+ fClustersLay2[iC2][0] = TMath::ACos(z/r); // Store Theta
+ fClustersLay2[iC2][1] = TMath::Pi() + TMath::ATan2(-y,-x); // Store Phi
}
//###########################################################
- // Loop on layer 1
- for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
+ Int_t found = 1;
+ while (found > 0) {
+ found = 0;
+
+ // Step1: find all tracklets allowing double assocation
+ // Loop on layer 1
+ for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
+
+ // already used or in the overlap ?
+ if (associatedLay1[iC1] != 0 || fOverlapFlagClustersLay1[iC1]) continue;
+
+ found++;
+
+ // reset of variables for multiple candidates
+ Int_t iC2WithBestDist = -1; // reset
+ Double_t minDist = 2; // reset
+
+ // Loop on layer 2
+ for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
+
+ // in the overlap ?
+ if (fOverlapFlagClustersLay2[iC2]) continue;
+
+ if (blacklist[iC1]) {
+ Bool_t blacklisted = kFALSE;
+ for (Int_t i=0; i<blacklist[iC1]->GetSize(); i++) {
+ if (blacklist[iC1]->At(i) == iC2) {
+ blacklisted = kTRUE;
+ break;
+ }
+ }
+ if (blacklisted) continue;
+ }
- // reset of variables for multiple candidates
- Int_t iC2WithBestDist = 0; // reset
- Float_t distmin = 100.; // just to put a huge number!
- Float_t dPhimin = 0.; // Used for histograms only!
- Float_t dThetamin = 0.; // Used for histograms only!
- Float_t dZetamin = 0.; // Used for histograms only!
-
- // Loop on layer 2
- for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
-
- // The following excludes double associations
- if (!fAssociationFlag[iC2]) {
-
// find the difference in angles
- Float_t dTheta = fClustersLay2[iC2][0] - fClustersLay1[iC1][0];
- Float_t dPhi = fClustersLay2[iC2][1] - fClustersLay1[iC1][1];
-
- // find the difference in z (between linear projection from layer 1
- // and the actual point: Dzeta= z1/r1*r2 -z2)
- Float_t r2 = fClustersLay2[iC2][2]/TMath::Cos(fClustersLay2[iC2][0]);
- Float_t dZeta = fClustersLay1[iC1][2]*r2 - fClustersLay2[iC2][2];
-
+ Double_t dTheta = TMath::Abs(fClustersLay2[iC2][0] - fClustersLay1[iC1][0]);
+ Double_t dPhi = TMath::Abs(fClustersLay2[iC2][1] - fClustersLay1[iC1][1]);
+ // take into account boundary condition
+ if (dPhi>pi) dPhi=2.*pi-dPhi;
+
if (fHistOn) {
- fhClustersDPhiAll->Fill(dPhi);
+ fhClustersDPhiAll->Fill(dPhi);
fhClustersDThetaAll->Fill(dTheta);
- fhClustersDZetaAll->Fill(dZeta);
fhDPhiVsDThetaAll->Fill(dTheta, dPhi);
- fhDPhiVsDZetaAll->Fill(dZeta, dPhi);
}
- // make "elliptical" cut in Phi and Zeta!
- Float_t d = TMath::Sqrt(TMath::Power(dPhi/fPhiWindow,2) + TMath::Power(dZeta/fZetaWindow,2));
-
- if (d>1) continue;
-
- //look for the minimum distance: the minimum is in iC2WithBestDist
- if (TMath::Sqrt(dZeta*dZeta+(r2*dPhi*r2*dPhi)) < distmin ) {
- distmin=TMath::Sqrt(dZeta*dZeta + (r2*dPhi*r2*dPhi));
- dPhimin = dPhi;
- dThetamin = dTheta;
- dZetamin = dZeta;
+
+ dPhi -= dPhiShift;
+
+ // make "elliptical" cut in Phi and Theta!
+ Float_t d = dPhi*dPhi/dPhiWindow2 + dTheta*dTheta/dThetaWindow2;
+
+ // look for the minimum distance: the minimum is in iC2WithBestDist
+ if (d<1 && d<minDist) {
+ minDist=d;
iC2WithBestDist = iC2;
}
- }
- } // end of loop over clusters in layer 2
+ } // end of loop over clusters in layer 2
- if (distmin<100) { // This means that a cluster in layer 2 was found that mathes with iC1
-
- if (fHistOn) {
- fhClustersDPhiAcc->Fill(dPhimin);
- fhClustersDThetaAcc->Fill(dThetamin);
- fhClustersDZetaAcc->Fill(dZetamin);
- fhDPhiVsDThetaAcc->Fill(dThetamin, dPhimin);
- fhDPhiVsDZetaAcc->Fill(dZetamin, dPhimin);
- }
-
- if (fOnlyOneTrackletPerC2) fAssociationFlag[iC2WithBestDist] = kTRUE; // flag the association
-
- // store the tracklet
-
- // use the theta from the clusters in the first layer
- fTracklets[fNTracklets][0] = fClustersLay1[iC1][0];
- // use the phi from the clusters in the first layer
- fTracklets[fNTracklets][1] = fClustersLay1[iC1][1];
- // Store the difference between phi1 and phi2
- fTracklets[fNTracklets][2] = fClustersLay1[iC1][1] - fClustersLay2[iC2WithBestDist][1];
+ if (minDist<1) { // This means that a cluster in layer 2 was found that matches with iC1
+
+ if (minDists[iC2WithBestDist] > minDist) {
+ Int_t oldPartner = partners[iC2WithBestDist];
+ partners[iC2WithBestDist] = iC1;
+ minDists[iC2WithBestDist] = minDist;
+
+ // mark as assigned
+ associatedLay1[iC1] = 1;
+
+ if (oldPartner != -1) {
+ // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its blacklist
+ if (blacklist[oldPartner] == 0) {
+ blacklist[oldPartner] = new TArrayI(1);
+ } else blacklist[oldPartner]->Set(blacklist[oldPartner]->GetSize()+1);
+
+ blacklist[oldPartner]->AddAt(iC2WithBestDist, blacklist[oldPartner]->GetSize()-1);
+
+ // mark as free
+ associatedLay1[oldPartner] = 0;
+ }
+ } else {
+ // try again to find a cluster without considering iC2WithBestDist
+ if (blacklist[iC1] == 0) {
+ blacklist[iC1] = new TArrayI(1);
+ }
+ else
+ blacklist[iC1]->Set(blacklist[iC1]->GetSize()+1);
+
+ blacklist[iC1]->AddAt(iC2WithBestDist, blacklist[iC1]->GetSize()-1);
+ }
+
+ } else // cluster has no partner; remove
+ associatedLay1[iC1] = 2;
+ } // end of loop over clusters in layer 1
+ }
+
+ // Step2: store tracklets; remove used clusters
+ for (Int_t iC2=0; iC2<fNClustersLay2; iC2++) {
+
+ if (partners[iC2] == -1) continue;
+
+ if (fOverlapFlagClustersLay1[partners[iC2]] || fOverlapFlagClustersLay2[iC2]) continue;
+ if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (partners[iC2],iC2);
+
+ fTracklets[fNTracklets] = new Float_t[6];
- if (fHistOn) {
- Float_t eta=fTracklets[fNTracklets][0];
- eta= TMath::Tan(eta/2.);
- eta=-TMath::Log(eta);
- fhetaTracklets->Fill(eta);
- fhphiTracklets->Fill(fTracklets[fNTracklets][1]);
+ // use the theta from the clusters in the first layer
+ fTracklets[fNTracklets][0] = fClustersLay1[partners[iC2]][0];
+ // use the phi from the clusters in the first layer
+ fTracklets[fNTracklets][1] = fClustersLay1[partners[iC2]][1];
+ // store the difference between phi1 and phi2
+ fTracklets[fNTracklets][2] = fClustersLay1[partners[iC2]][1] - fClustersLay2[iC2][1];
+
+ // define dphi in the range [0,pi] with proper sign (track charge correlated)
+ if (fTracklets[fNTracklets][2] > TMath::Pi())
+ fTracklets[fNTracklets][2] = fTracklets[fNTracklets][2]-2.*TMath::Pi();
+ if (fTracklets[fNTracklets][2] < -TMath::Pi())
+ fTracklets[fNTracklets][2] = fTracklets[fNTracklets][2]+2.*TMath::Pi();
+
+ // store the difference between theta1 and theta2
+ fTracklets[fNTracklets][3] = fClustersLay1[partners[iC2]][0] - fClustersLay2[iC2][0];
+
+ if (fHistOn) {
+ fhClustersDPhiAcc->Fill(fTracklets[fNTracklets][2]);
+ fhClustersDThetaAcc->Fill(fTracklets[fNTracklets][3]);
+ fhDPhiVsDThetaAcc->Fill(fTracklets[fNTracklets][3],fTracklets[fNTracklets][2]);
+ }
+
+ // find label
+ // if equal label in both clusters found this label is assigned
+ // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned
+ Int_t label1 = 0;
+ Int_t label2 = 0;
+ while (label2 < 3) {
+ if ((Int_t) fClustersLay1[partners[iC2]][3+label1] != -2 && (Int_t) fClustersLay1[partners[iC2]][3+label1] == (Int_t) fClustersLay2[iC2][3+label2])
+ break;
+ label1++;
+ if (label1 == 3) {
+ label1 = 0;
+ label2++;
}
-
- AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
- AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", iC1,
- iC2WithBestDist));
- fNTracklets++;
+ }
+ if (label2 < 3) {
+ AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n", (Int_t) fClustersLay1[partners[iC2]][3+label1], (Int_t) fClustersLay2[iC2][3+label2], fNTracklets));
+ fTracklets[fNTracklets][4] = fClustersLay1[partners[iC2]][3+label1];
+ fTracklets[fNTracklets][5] = fClustersLay2[iC2][3+label2];
+ } else {
+ AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n", (Int_t) fClustersLay1[partners[iC2]][3], (Int_t) fClustersLay1[partners[iC2]][4], (Int_t) fClustersLay1[partners[iC2]][5], (Int_t) fClustersLay2[iC2][3], (Int_t) fClustersLay2[iC2][4], (Int_t) fClustersLay2[iC2][5], fNTracklets));
+ fTracklets[fNTracklets][4] = fClustersLay1[partners[iC2]][3];
+ fTracklets[fNTracklets][5] = fClustersLay2[iC2][3];
}
- // Delete the following else if you do not want to save Clusters!
+ if (fHistOn) {
+ Float_t eta=fTracklets[fNTracklets][0];
+ eta= TMath::Tan(eta/2.);
+ eta=-TMath::Log(eta);
+ fhetaTracklets->Fill(eta);
+ fhphiTracklets->Fill(fTracklets[fNTracklets][1]);
+ }
- else { // This means that the cluster has not been associated
+ AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets));
+ AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", partners[iC2], iC2));
+ fNTracklets++;
- // store the cluster
-
- fTracklets[fNTracklets][0] = fClustersLay1[iC1][0];
- fTracklets[fNTracklets][1] = fClustersLay1[iC1][1];
- // Store a flag. This will indicate that the "tracklet"
- // was indeed a single cluster!
- fTracklets[fNTracklets][2] = -999999.;
- AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
- fNTracklets, iC1));
- fNTracklets++;
+ associatedLay1[partners[iC2]] = 1;
+ }
+
+ // Delete the following else if you do not want to save Clusters!
+ // store the cluster
+ for (Int_t iC1=0; iC1<fNClustersLay1; iC1++) {
+ if (associatedLay1[iC1]==2||associatedLay1[iC1]==0) {
+ fSClusters[fNSingleCluster] = new Float_t[2];
+ fSClusters[fNSingleCluster][0] = fClustersLay1[iC1][0];
+ fSClusters[fNSingleCluster][1] = fClustersLay1[iC1][1];
+ AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)",
+ fNSingleCluster, iC1));
+ fNSingleCluster++;
}
+ }
+
+ delete[] partners;
+ delete[] minDists;
+
+ for (Int_t i=0; i<fNClustersLay1; i++)
+ if (blacklist[i])
+ delete blacklist[i];
+ delete[] blacklist;
- } // end of loop over clusters in layer 1
-
AliDebug(1,Form("%d tracklets found", fNTracklets));
}
// - gets the clusters from the cluster tree
// - convert them into global coordinates
// - store them in the internal arrays
+ // - count the number of cluster-fired chips
- AliDebug(1,"Loading clusters ...");
+ AliDebug(1,"Loading clusters and cluster-fired chips ...");
fNClustersLay1 = 0;
fNClustersLay2 = 0;
+ fNFiredChips[0] = 0;
+ fNFiredChips[1] = 0;
- TClonesArray* itsClusters = new TClonesArray("AliITSRecPoint");
- TBranch* itsClusterBranch=itsClusterTree->GetBranch("ITSRecPoints");
+ AliITSsegmentationSPD seg;
- itsClusterBranch->SetAddress(&itsClusters);
+ AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
+ TClonesArray* itsClusters=rpcont->FetchClusters(0,itsClusterTree);
+ if(!rpcont->IsSPDActive()){
+ AliWarning("No SPD rec points found, multiplicity not calculated");
+ return;
+ }
+ Float_t cluGlo[3]={0.,0.,0.};
+
- Int_t nItsSubs = (Int_t)itsClusterTree->GetEntries();
+ // count clusters
+ // loop over the SPD subdetectors
+ Int_t nSPDL1 = AliITSgeomTGeo::GetModuleIndex(2,1,1);
+ for (Int_t iIts=0; iIts < nSPDL1; iIts++) {
+ itsClusters=rpcont->UncheckedGetClusters(iIts);
+ fNClustersLay1 += itsClusters->GetEntriesFast();
+ }
+ Int_t nSPDL2=AliITSgeomTGeo::GetModuleIndex(3,1,1);
+ for (Int_t iIts=nSPDL1; iIts < nSPDL2; iIts++) {
+ itsClusters=rpcont->UncheckedGetClusters(iIts);
+ fNClustersLay2 += itsClusters->GetEntriesFast();
+ }
+
+ // create arrays
+ fClustersLay1 = new Float_t*[fNClustersLay1];
+ fDetectorIndexClustersLay1 = new Int_t[fNClustersLay1];
+ fOverlapFlagClustersLay1 = new Bool_t[fNClustersLay1];
+
+ fClustersLay2 = new Float_t*[fNClustersLay2];
+ fDetectorIndexClustersLay2 = new Int_t[fNClustersLay2];
+ fOverlapFlagClustersLay2 = new Bool_t[fNClustersLay2];
+
+ // no double association allowed
+ fTracklets = new Float_t*[TMath::Min(fNClustersLay1, fNClustersLay2)];
+ fSClusters = new Float_t*[fNClustersLay1];
+
+ for (Int_t i=0; i<fNClustersLay1; i++) {
+ fClustersLay1[i] = new Float_t[6];
+ fOverlapFlagClustersLay1[i] = kFALSE;
+ fSClusters[i] = 0;
+ }
+
+ for (Int_t i=0; i<fNClustersLay2; i++) {
+ fClustersLay2[i] = new Float_t[6];
+ fOverlapFlagClustersLay2[i] = kFALSE;
+ }
+ for (Int_t i=0; i<TMath::Min(fNClustersLay1, fNClustersLay2); i++)
+ fTracklets[i] = 0;
+
+ // fill clusters
// loop over the its subdetectors
- for (Int_t iIts=0; iIts < nItsSubs; iIts++) {
+ fNClustersLay1 = 0; // reset to 0
+ fNClustersLay2 = 0;
+ for (Int_t iIts=0; iIts < nSPDL2; iIts++) {
- if (!itsClusterTree->GetEvent(iIts))
- continue;
+ itsClusters=rpcont->UncheckedGetClusters(iIts);
Int_t nClusters = itsClusters->GetEntriesFast();
-
- // stuff needed to get the global coordinates
- Double_t rot[9]; fGeometry->GetRotMatrix(iIts,rot);
- Int_t lay,lad,det; fGeometry->GetModuleId(iIts,lay,lad,det);
- Float_t tx,ty,tz; fGeometry->GetTrans(lay,lad,det,tx,ty,tz);
-
- // Below:
- // "alpha" is the angle from the global X-axis to the
- // local GEANT X'-axis ( rot[0]=cos(alpha) and rot[1]=sin(alpha) )
- // "phi" is the angle from the global X-axis to the
- // local cluster X"-axis
-
- Double_t alpha = TMath::ATan2(rot[1],rot[0])+TMath::Pi();
- Double_t itsPhi = TMath::Pi()/2+alpha;
-
- if (lay==1) itsPhi+=TMath::Pi();
- Double_t cp=TMath::Cos(itsPhi), sp=TMath::Sin(itsPhi);
- Double_t r=tx*cp+ty*sp;
+
+ // number of clusters in each chip of the current module
+ Int_t nClustersInChip[5] = {0,0,0,0,0};
+ Int_t layer = 0;
// loop over clusters
while(nClusters--) {
- AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
+ AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
- if (cluster->GetLayer()>1)
- continue;
+ layer = cluster->GetLayer();
+ if (layer>1) continue;
- Float_t x = r*cp - cluster->GetY()*sp;
- Float_t y = r*sp + cluster->GetY()*cp;
- Float_t z = cluster->GetZ();
+ cluster->GetGlobalXYZ(cluGlo);
+ Float_t x = cluGlo[0];
+ Float_t y = cluGlo[1];
+ Float_t z = cluGlo[2];
+
+ // find the chip for the current cluster
+ Float_t locz = cluster->GetDetLocalZ();
+ Int_t iChip = seg.GetChipFromLocal(0,locz);
+ nClustersInChip[iChip]++;
- if (cluster->GetLayer()==0) {
+ if (layer==0) {
fClustersLay1[fNClustersLay1][0] = x;
fClustersLay1[fNClustersLay1][1] = y;
fClustersLay1[fNClustersLay1][2] = z;
+
+ fDetectorIndexClustersLay1[fNClustersLay1]=iIts;
+
+ for (Int_t i=0; i<3; i++)
+ fClustersLay1[fNClustersLay1][3+i] = cluster->GetLabel(i);
fNClustersLay1++;
}
- if (cluster->GetLayer()==1) {
+ if (layer==1) {
fClustersLay2[fNClustersLay2][0] = x;
fClustersLay2[fNClustersLay2][1] = y;
fClustersLay2[fNClustersLay2][2] = z;
+
+ fDetectorIndexClustersLay2[fNClustersLay2]=iIts;
+
+ for (Int_t i=0; i<3; i++)
+ fClustersLay2[fNClustersLay2][3+i] = cluster->GetLabel(i);
fNClustersLay2++;
}
}// end of cluster loop
+
+ // get number of fired chips in the current module
+
+ for(Int_t ifChip=0; ifChip<5; ifChip++) {
+ if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
+ }
+
} // end of its "subdetector" loop
-
+
AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay1,fNClustersLay2));
+ AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
+}
+//____________________________________________________________________
+void
+AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) {
+ // This method
+ // - gets the clusters from the cluster tree
+ // - counts the number of (cluster)fired chips
+
+ AliDebug(1,"Loading cluster-fired chips ...");
+
+ fNFiredChips[0] = 0;
+ fNFiredChips[1] = 0;
+
+ AliITSsegmentationSPD seg;
+ AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance();
+ TClonesArray* itsClusters=rpcont->FetchClusters(0,itsClusterTree);
+ if(!rpcont->IsSPDActive()){
+ AliWarning("No SPD rec points found, multiplicity not calculated");
+ return;
+ }
+
+ // loop over the its subdetectors
+ Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1);
+ for (Int_t iIts=0; iIts < nSPDmodules; iIts++) {
+ itsClusters=rpcont->UncheckedGetClusters(iIts);
+ Int_t nClusters = itsClusters->GetEntriesFast();
+
+ // number of clusters in each chip of the current module
+ Int_t nClustersInChip[5] = {0,0,0,0,0};
+ Int_t layer = 0;
+
+ // loop over clusters
+ while(nClusters--) {
+ AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters);
+
+ layer = cluster->GetLayer();
+ if (layer>1) continue;
+
+ // find the chip for the current cluster
+ Float_t locz = cluster->GetDetLocalZ();
+ Int_t iChip = seg.GetChipFromLocal(0,locz);
+ nClustersInChip[iChip]++;
+
+ }// end of cluster loop
+
+ // get number of fired chips in the current module
+ for(Int_t ifChip=0; ifChip<5; ifChip++) {
+ if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++;
+ }
+
+ } // end of its "subdetector" loop
+
+
+ AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1]));
}
//____________________________________________________________________
void
fhClustersDPhiAll->Write();
fhClustersDThetaAll->Write();
- fhClustersDZetaAll->Write();
fhDPhiVsDThetaAll->Write();
- fhDPhiVsDZetaAll->Write();
fhClustersDPhiAcc->Write();
fhClustersDThetaAcc->Write();
- fhClustersDZetaAcc->Write();
fhDPhiVsDThetaAcc->Write();
- fhDPhiVsDZetaAcc->Write();
fhetaTracklets->Write();
fhphiTracklets->Write();
fhetaClustersLay1->Write();
fhphiClustersLay1->Write();
}
+
+//____________________________________________________________________
+void
+AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist) {
+
+ Float_t distClSameMod=0.;
+ Float_t distClSameModMin=0.;
+ Int_t iClOverlap =0;
+ Float_t meanRadiusLay1 = 3.99335; // average radius inner layer
+ Float_t meanRadiusLay2 = 7.37935; // average radius outer layer;
+
+ Float_t zproj1=0.;
+ Float_t zproj2=0.;
+ Float_t deZproj=0.;
+
+ // Loop on inner layer clusters
+ for (Int_t iiC1=0; iiC1<fNClustersLay1; iiC1++) {
+ if (!fOverlapFlagClustersLay1[iiC1]) {
+ // only for adjacent modules
+ if ((TMath::Abs(fDetectorIndexClustersLay1[iC1]-fDetectorIndexClustersLay1[iiC1])==4)||
+ (TMath::Abs(fDetectorIndexClustersLay1[iC1]-fDetectorIndexClustersLay1[iiC1])==76)) {
+ Float_t dePhi=TMath::Abs(fClustersLay1[iiC1][1]-fClustersLay1[iC1][1]);
+ if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
+
+ zproj1=meanRadiusLay1/TMath::Tan(fClustersLay1[iC1][0]);
+ zproj2=meanRadiusLay1/TMath::Tan(fClustersLay1[iiC1][0]);
+
+ deZproj=TMath::Abs(zproj1-zproj2);
+
+ distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
+ if (distClSameMod<=1.) fOverlapFlagClustersLay1[iiC1]=kTRUE;
+
+// if (distClSameMod<=1.) {
+// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
+// distClSameModMin=distClSameMod;
+// iClOverlap=iiC1;
+// }
+// }
+
+
+ } // end adjacent modules
+ }
+ } // end Loop on inner layer clusters
+
+// if (distClSameModMin!=0.) fOverlapFlagClustersLay1[iClOverlap]=kTRUE;
+
+ distClSameMod=0.;
+ distClSameModMin=0.;
+ iClOverlap =0;
+ // Loop on outer layer clusters
+ for (Int_t iiC2=0; iiC2<fNClustersLay2; iiC2++) {
+ if (!fOverlapFlagClustersLay2[iiC2]) {
+ // only for adjacent modules
+ if ((TMath::Abs(fDetectorIndexClustersLay2[iC2WithBestDist]-fDetectorIndexClustersLay2[iiC2])==4) ||
+ (TMath::Abs(fDetectorIndexClustersLay2[iC2WithBestDist]-fDetectorIndexClustersLay2[iiC2])==156)) {
+ Float_t dePhi=TMath::Abs(fClustersLay2[iiC2][1]-fClustersLay2[iC2WithBestDist][1]);
+ if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi;
+
+ zproj1=meanRadiusLay2/TMath::Tan(fClustersLay2[iC2WithBestDist][0]);
+ zproj2=meanRadiusLay2/TMath::Tan(fClustersLay2[iiC2][0]);
+
+ deZproj=TMath::Abs(zproj1-zproj2);
+ distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2));
+ if (distClSameMod<=1.) fOverlapFlagClustersLay2[iiC2]=kTRUE;
+
+// if (distClSameMod<=1.) {
+// if (distClSameModMin==0. || distClSameMod<distClSameModMin) {
+// distClSameModMin=distClSameMod;
+// iClOverlap=iiC2;
+// }
+// }
+
+ } // end adjacent modules
+ }
+ } // end Loop on outer layer clusters
+
+// if (distClSameModMin!=0.) fOverlapFlagClustersLay2[iClOverlap]=kTRUE;
+
+}