--- /dev/null
+/**************************************************************************
+ * Copyright(c) 1998-2009, 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. *
+ **************************************************************************/
+
+//*************************************************************************
+// Class AliAnalysisTaskIPInfo
+// AliAnalysisTask to extract from the ESD the IP position and sigma
+// as well as to estimate the primary vertex and tracks DCA resolution.
+// Uses external class AliIntSpotEstimator
+//
+// Author: ruben.shahoyan@cern.ch
+//*************************************************************************
+
+#include <TChain.h>
+#include <TTree.h>
+#include <TNtuple.h>
+#include <TBranch.h>
+#include <TClonesArray.h>
+#include <TObjArray.h>
+#include <TH1F.h>
+#include <TH2F.h>
+#include <TNtuple.h>
+#include <TCanvas.h>
+
+#include "AliAnalysisTask.h"
+#include "AliAnalysisManager.h"
+
+#include "AliESDtrack.h"
+#include "AliExternalTrackParam.h"
+#include "AliESDVertex.h"
+#include "AliESDEvent.h"
+#include "AliESDfriend.h"
+#include "AliVertexerTracks.h"
+#include "AliESDInputHandler.h"
+#include "AliAnalysisTaskIPInfo.h"
+#include "AliIntSpotEstimator.h"
+#include "AliMultiplicity.h"
+
+
+ClassImp(AliAnalysisTaskIPInfo)
+
+const Char_t* AliAnalysisTaskIPInfo::fEstNames[kNEst] = {"ITSTPC","TPC","SPD"};
+
+//________________________________________________________________________
+AliAnalysisTaskIPInfo::AliAnalysisTaskIPInfo(const char *name)
+: AliAnalysisTask(name, "IP analysis"),
+ fESD(0),fESDfriend(0),fOutput(0),fTracks(50)
+{
+
+ // Define input and output slots here
+ // Input slot #0 works with a TChain
+ DefineInput(0, TChain::Class());
+ // Output slot #0 writes into a TList container
+ DefineOutput(0, TList::Class()); //My private output
+ //
+ for (int i=0;i<kNEst;i++) fIPEst[i] = 0;
+ //
+}
+
+//________________________________________________________________________
+AliAnalysisTaskIPInfo::~AliAnalysisTaskIPInfo()
+{
+ // Destructor
+ if (fOutput) {
+ delete fOutput;
+ fOutput = 0;
+ }
+}
+//________________________________________________________________________
+void AliAnalysisTaskIPInfo::SetIPCenIni(Int_t estID, Double_t x,Double_t y,Double_t z)
+{
+ // set initial estimate of the IP center
+ if (estID<0 || estID>= kNEst) return;
+ fIPCenIni[estID][0] = x;
+ fIPCenIni[estID][1] = y;
+ fIPCenIni[estID][2] = z;
+}
+
+//________________________________________________________________________
+void AliAnalysisTaskIPInfo::SetOptions(Int_t estID, Bool_t recoVtx,
+ Double_t outcut,Int_t ntrIP,Int_t nPhiBins,Int_t nestb,
+ Double_t estmin,Double_t estmax,
+ Int_t ntrBins,Int_t ntMn,Int_t ntMx,
+ Int_t nPBins,Double_t pmn,Double_t pmx,Bool_t fillNt)
+{
+ // set options for estimators
+ if (estID<0 || estID>= kNEst) return;
+ fNTrMinIP[estID] = ntrIP;
+ fRecoVtx[estID] = recoVtx;
+ fNPhiBins[estID] = nPhiBins;
+ fNEstb[estID] = nestb;
+ fNTrBins[estID] = ntrBins;
+ fNPBins[estID] = nPBins;
+ fNTrMin[estID] = ntMn;
+ fNTrMax[estID] = ntMx;
+ fOutCut[estID] = outcut;
+ fEstMin[estID] = estmin;
+ fEstMax[estID] = estmax;
+ fPMin[estID] = pmn;
+ fPMax[estID] = pmx;
+ fFillNt[estID] = fillNt;
+}
+
+//________________________________________________________________________
+void AliAnalysisTaskIPInfo::ConnectInputData(Option_t *)
+{
+ // Connect ESD or AOD here
+ // Called once
+ //
+ AliInfo("HERE");
+ TTree* tree = dynamic_cast<TTree*> (GetInputData(0));
+ if (!tree) {
+ Printf("ERROR: Could not read chain from input slot 0");
+ }
+ else {
+ tree->SetBranchAddress("ESDfriend.",&fESDfriend);
+ AliESDInputHandler *esdH = dynamic_cast<AliESDInputHandler*> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
+ if (!esdH) Printf("ERROR: Could not get ESDInputHandler");
+ else fESD = esdH->GetEvent();
+ }
+ //
+ return;
+}
+
+//________________________________________________________________________
+void AliAnalysisTaskIPInfo::CreateOutputObjects()
+{
+ // Create estimators
+ // Several histograms are more conveniently managed in a TList
+ fOutput = new TList;
+ fOutput->SetOwner();
+ //
+ Double_t err[3]={0.0400,0.0400,7.5};
+ //
+ for (int i=0;i<kNEst;i++) if (fNEstb[i]>1) {
+ TString nm = GetName();
+ TString nmes = fEstNames[i];
+ nm += nmes;
+ fIPEst[i] = new AliIntSpotEstimator(nm.Data(),fOutCut[i],fNTrMinIP[i],fNPhiBins[i],
+ fNEstb[i],fEstMin[i],fEstMax[i],
+ fNTrBins[i],fNTrMin[i],fNTrMax[i],
+ fNPBins[i],fPMin[i],fPMax[i],fFillNt[i]);
+ AliESDVertex *initVertex = new AliESDVertex(fIPCenIni[i],err);
+ fIPEst[i]->GetVertexer()->SetVtxStart(initVertex);
+ delete initVertex;
+ fIPEst[i]->GetVertexer()->SetConstraintOff();
+ fIPEst[i]->GetVertexer()->SetMinClusters(2);
+ fIPEst[i]->SetIPCenIni(fIPCenIni[i]);
+ if (nmes == "TPC") fIPEst[i]->GetVertexer()->SetTPCMode();
+ else fIPEst[i]->GetVertexer()->SetITSMode();
+ //
+ fOutput->Add(fIPEst[i]);
+ if (fIPEst[i]->GetNtuple()) fOutput->Add(fIPEst[i]->GetNtuple());
+ }
+ //
+ return;
+}
+
+//________________________________________________________________________
+void AliAnalysisTaskIPInfo::Exec(Option_t *)
+{
+ static TClonesArray tracks("AliExternalTrackParam",50);
+ //
+ // Main loop
+ // Called for each event
+ if (!fESD) {
+ Printf("ERROR: fESD not available");
+ return;
+ }
+ fESD->SetESDfriend(fESDfriend);
+ //
+ const AliESDVertex *vtx;
+ UShort_t *trackID;
+ Int_t ntracks;
+ //
+ for (int ie=0;ie<kNEst;ie++) {
+ //
+ if (!fIPEst[ie]) continue;
+ if (ie==kTPC) {
+ fIPEst[kTPC]->GetVertexer()->SetFieldkG( fESD->GetMagneticField() );
+ vtx = fRecoVtx[kTPC] ? fIPEst[kTPC]->GetVertexer()->FindPrimaryVertex(fESD) : fESD->GetPrimaryVertexTPC();
+ if (vtx) {
+ ntracks = vtx->GetNIndices();
+ trackID = (UShort_t*)vtx->GetIndices();
+ for (int i=ntracks;i--;) fTracks.Add((TObject*)fESD->GetTrack(trackID[i])->GetTPCInnerParam());
+ fIPEst[kTPC]->ProcessEvent(&fTracks);
+ fTracks.Clear();
+ }
+ }
+ else if (ie==kITSTPC) {
+ fIPEst[kITSTPC]->GetVertexer()->SetFieldkG( fESD->GetMagneticField() );
+ vtx = fRecoVtx[kITSTPC] ? fIPEst[kITSTPC]->GetVertexer()->FindPrimaryVertex(fESD) : fESD->GetPrimaryVertex();
+ if (vtx) {
+ ntracks = vtx->GetNIndices();
+ trackID = (UShort_t*)vtx->GetIndices();
+ for (int i=ntracks;i--;) fTracks.Add((TObject*)fESD->GetTrack(trackID[i]));
+ fIPEst[kITSTPC]->ProcessEvent(&fTracks);
+ fTracks.Clear();
+ }
+ }
+ else if (ie==kSPD) {
+ fIPEst[kSPD]->GetVertexer()->SetFieldkG( fESD->GetMagneticField() );
+ ntracks = CreateSPDTracklets(tracks);
+ for (int i=ntracks;i--;) fTracks.Add((TObject*)tracks[i]);
+ fIPEst[kSPD]->ProcessEvent(&fTracks);
+ fTracks.Clear();
+ }
+ }
+ //
+ PostData(0, fOutput);
+ //
+ return;
+}
+
+//________________________________________________________________________
+Int_t AliAnalysisTaskIPInfo::CreateSPDTracklets(TClonesArray& tracks)
+{
+ // create traclets from multiplicity class
+ double cv[21] = {
+ 25e-4,
+ 0 , 25e-4,
+ 0 , 0, 40e-2,
+ 0 , 0, 0, 1e-2,
+ 0 , 0, 0, 0, 1e-2,
+ 0 , 0, 0, 0, 0, 1e-2
+ };
+ //
+ double xyzt[3],pxyz[3];
+ int nSPDtracks = 0;
+ tracks.Delete();
+ const AliMultiplicity *mult = fESD->GetMultiplicity();
+ const AliESDVertex *spdVtx = fESD->GetPrimaryVertexSPD();
+ int nTracklets = 0;
+ if (mult && spdVtx && (nTracklets=mult->GetNumberOfTracklets())>2 ) {
+ const Double_t kRLay1=3.9, kRLay2=7.6;
+ double xv = spdVtx->GetXv();
+ double yv = spdVtx->GetYv();
+ double zv = spdVtx->GetZv();
+ for (int i=0;i<nTracklets;i++) { // get cluster coordinates from tracklet
+ double phi1 = mult->GetPhi(i);
+ double tht1 = mult->GetTheta(i);
+ double phi2 = phi1 - mult->GetDeltaPhi(i);
+ double tht2 = tht1 - mult->GetDeltaTheta(i);
+ double cs = TMath::Cos(phi1);
+ double sn = TMath::Sin(tht1);
+ double det = xv*sn+yv*sn;
+ det = det*det + kRLay1*kRLay1;
+ double t = -(xv*cs+yv*sn) + TMath::Sqrt(det);
+ double x1 = cs*t;
+ double y1 = sn*t;
+ double z1 = zv + TMath::Sqrt(x1*x1+y1*y1)/TMath::Tan(tht1);
+ x1 += xv;
+ y1 += yv;
+ //
+ cs = TMath::Cos(phi2);
+ sn = TMath::Sin(tht2);
+ det = xv*sn+yv*sn;
+ det = det*det + kRLay2*kRLay2;
+ t = -(xv*cs+yv*sn) + TMath::Sqrt(det);
+ double dx = cs*t;
+ double dy = sn*t;
+ double dz = zv + TMath::Sqrt(dx*dx+dy*dy)/TMath::Tan(tht2);
+ dx += xv-x1;
+ dy += yv-y1;
+ dz += -z1;
+ double dr = TMath::Sqrt(dx*dx+dy*dy+dz*dz);
+ pxyz[0] = dx/dr; // direction cosines
+ pxyz[1] = dy/dr;
+ pxyz[2] = dz/dr;
+ t = (xv-x1)*pxyz[0] + (yv-y1)*pxyz[1] + (zv-z1)*pxyz[2];
+ xyzt[0] = x1 + t*pxyz[0]; // PCA to vertex
+ xyzt[1] = y1 + t*pxyz[1];
+ xyzt[2] = z1 + t*pxyz[2];
+ //
+ new(tracks[nSPDtracks++]) AliExternalTrackParam(xyzt,pxyz,cv,0);
+ }
+ }
+ return nSPDtracks;
+}
+
+//________________________________________________________________________
+void AliAnalysisTaskIPInfo::Terminate(Option_t *)
+{
+ // Draw result to the screen
+ // Called once at the end of the query
+ fOutput = dynamic_cast<TList*> (GetOutputData(0));
+ if (!fOutput) {
+ Printf("ERROR: fOutput not available");
+ return;
+ }
+ //
+ return;
+}
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