[u/mrichter/AliRoot.git] / TPC / AliL1Delay.C

/////////////////////////////////////////////////////////////////////////////
//                                                                         //
// This is a macro which measures the time delay of L1 trigger in TPC      //
//                                                                         //
// It reads the ESD tracks and fills histograms with the distance          //
// between the primary vertex and the Z position                           //
// of the point of closest approach between the track and the beam axis.   //
// The processing of forward and backward tracks is done separately.       //
// The corresponding histograms are fitted with gaussian and the           //
// shifts of the Z positions are extracted.                                //
// The L1 time delay is taken as an average of the forward and backward    //
// (with opposite sign) shifts divided by the drift velocity.              //
// We assume that the ESD tracks are obtained by the TPC tracking stand    //
// alone.                                                                  //
// The propagation to the vertex can be done either with or without        //
// TGeoManager.                                                            //
//                                                                         //
// Cvetan.Cheshkov@cern.ch                                                 //
//                                                                         //
/////////////////////////////////////////////////////////////////////////////

#if !defined(__CINT__) || defined(__MAKECINT__)
  #include <TMath.h>
  #include <TError.h>
  #include <Riostream.h>
  #include <TH1F.h>
  #include <TF1.h>
  #include <TTree.h>
  #include <TCanvas.h>
  #include <TFile.h>
  #include <TStyle.h>
  #include <TGeoManager.h>
  #include "AliRunLoader.h"
  #include "AliRun.h"
  #include "AliESD.h"
  #include "AliTracker.h"
  #include "AliTPCParam.h"
  #include "AliMagFMaps.h"
  #include "AliITStrackV2.h"
#endif

Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t);
Bool_t PropagateToVertex(AliESDtrack *track, Float_t *vtxXYZ);
Bool_t PropagateToVertexG(AliESDtrack *track, Float_t *vtxXYZ);

void AliL1Delay(const Char_t *esdfilename = "./AliESDs.root", const Char_t *galicefilename = "./galice.root", Bool_t withTGeo = kFALSE, const Char_t *geomfilename = "./geometry.root")
{
  const Int_t kMinNClusters = 0;
  const Double_t kPtMin = 0.5;
  const Double_t kMaxImpact = 0.3;
  const Double_t kDeltaZRes = 0.3;
  const Double_t kZRange = 20.;

  // Book histograms
  Int_t NBins = (Int_t)(2.*kZRange/(0.5*kDeltaZRes));
  TH1F *hDeltaZForward = new TH1F("hDeltaZForward","Longitudinal distance to the vertex (forward tracks)",NBins,-kZRange,kZRange); 
  TH1F *hDeltaZBackward = new TH1F("hDeltaZBackward","Longitudinal distance to the vertex (backward tracks)",NBins,-kZRange,kZRange);
  TH1F *hTrImpact = new TH1F("hTrImpact","Transverse impact parameter (all tracks)",100,0,30.*kMaxImpact); 

  // Open RunLoader
  AliRunLoader *rl = AliRunLoader::Open(galicefilename);
  if (!rl) {
    ::Error("AliL1Delay.C","Can't start session !");
    return;
  }
  rl->LoadgAlice();
  gAlice = rl->GetAliRun();

  // Set magnetic field
  AliMagF* field = gAlice->Field();
  AliTracker::SetFieldMap(field,kTRUE);
  AliExternalTrackParam::SetFieldMap(field);
  AliExternalTrackParam::SetNonuniformFieldTracking();
  const Float_t sfield = field->SolenoidField();

  // GetGeo manager
  if(withTGeo)
    {
      TFile *geoFile = TFile::Open(geomfilename);
      if (!geoFile || !geoFile->IsOpen()) {
	::Error("AliL1Delay.C","Can't open %s !",geomfilename);
	return;
      }
      gGeoManager = (TGeoManager *)geoFile->Get("Geo");
      if(!gGeoManager) {
	::Error("AliL1Delay.C","Can't find TGeoManager !");
	return;
      }
    }

  // Get X positions of the pad-rows
  TDirectory* saveDir = gDirectory;
  rl->CdGAFile();
  AliTPCParam* param = (AliTPCParam*) gDirectory->Get("75x40_100x60_150x60");
  if (!param) {
    ::Error("AliL1Delay.C","No TPC parameters found !");
    return;
  }
  Int_t nRowLow = param->GetNRowLow();
  Int_t nRowUp = param->GetNRowUp();
  Float_t xRow[159];
  for (Int_t i=0;i<nRowLow;i++){
    xRow[i] = param->GetPadRowRadiiLow(i);
  }
  for (Int_t i=0;i<nRowUp;i++){
    xRow[i+nRowLow] = param->GetPadRowRadiiUp(i);
  }
  saveDir->cd();

  // Open file with ESDs
  TFile *esdFile = TFile::Open(esdfilename);
  if (!esdFile || !esdFile->IsOpen()) {
    ::Error("AliL1Delay.C","Can't open %s !",esdfilename);
    return;
  }
  AliESD* event = new AliESD;
  TTree* esdTree = (TTree*) esdFile->Get("esdTree");
  if (!esdTree) {
    ::Error("AliL1Delay.C","No ESD tree found !");
    return;
  }
  esdTree->SetBranchAddress("ESD", &event);

  // Init PID
  AliPID pid;

  Int_t nEvent = esdTree->GetEntries();

  // Loop over events
  for(Int_t iEvent = 0; iEvent<nEvent; iEvent++)
    {
      esdTree->GetEvent(iEvent);
      const AliESDVertex *esdVtx = event->GetVertex();
      Double_t zVtx = esdVtx->GetZv();
      if(zVtx == 0.) continue; // Vertex is not found. Skip the event.
      Int_t nTrk=event->GetNumberOfTracks();

      ::Info("AliL1Delay.C","Event %d : Z vertex = %f  |  Number of tracks = %d",iEvent,zVtx,nTrk);

      for(Int_t iTrk=0; iTrk<nTrk; iTrk++)
	{
	  AliESDtrack *track = event->GetTrack(iTrk);
	  if(!track) continue;

	  // Track selection 
	  if((track->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
	  if(track->GetTPCclusters((Int_t)0x0)<(kMinNClusters*3)) continue;
	  if(track->GetP()<kPtMin) continue;

	  Int_t firstRow = (Int_t)(track->GetTPCPoints(0)+0.5);
	  Int_t lastRow = (Int_t)(track->GetTPCPoints(2)+0.5);
	  Double_t firstXYZ[3];
	  Double_t lastXYZ[3];
	  track->GetXYZAt(xRow[firstRow], sfield, firstXYZ);
	  track->GetXYZAt(xRow[lastRow], sfield, lastXYZ);

	  // Select if the track is forward or backward one
	  Bool_t IsForward;
	  if(firstXYZ[2] > 0 && lastXYZ[2] > 0)
	    IsForward = kTRUE;
	  else if(firstXYZ[2] < 0 && lastXYZ[2] < 0)
	    IsForward = kFALSE;
	  else
	    continue;

	  // Propagate the track to the vertex
	  Float_t vtxXYZ[3];
	  if(withTGeo) {
	    if(PropagateToVertexG(track,vtxXYZ) == 0) continue;
	  }
	  else {
	    if(PropagateToVertex(track,vtxXYZ) == 0) continue;
	  }

	  // Get the position at point of closest approach to the vertex
	  Float_t impact = TMath::Sqrt(vtxXYZ[0]*vtxXYZ[0]+vtxXYZ[1]*vtxXYZ[1]);
	  hTrImpact->Fill(impact);
	  // Select primary tracks
	  if(impact > kMaxImpact) continue;

	  if (IsForward)
	    hDeltaZForward->Fill(vtxXYZ[2]-zVtx);
	  else
	    hDeltaZBackward->Fill(vtxXYZ[2]-zVtx);
	}
    }

  //  delete event;
  //  esdFile->Close();

  // Check track propagation
  TF1 *fexpo = new TF1("fexpo","expo");
  hTrImpact->Fit("fexpo","E");
  Double_t slope = fexpo->GetParameter(1);
  if(slope > 3.*kMaxImpact)
    ::Warning("AliL1Delay.C","The transverse impact parameter distribution is too broad: %f +- %f",slope,fexpo->GetParError(1));
  delete fexpo;

  // Fit histograms and extract L1 time delay
  Double_t shifts[2],shifterrs2[2];
  {
    Double_t params[3];
    params[0] = hDeltaZForward->GetMaximumBin();
    params[1] = hDeltaZForward->GetBinCenter(hDeltaZForward->GetMaximumBin());
    params[2] = kDeltaZRes;
    TF1 *fgaus = new TF1("fgaus","gaus");
    fgaus->SetParameters(params);
    hDeltaZForward->Fit("fgaus","E");
    shifts[0] = fgaus->GetParameter(1);
    shifterrs2[0] = fgaus->GetParError(1)*fgaus->GetParError(1);
    delete fgaus;
  }
  {
    Double_t params[3];
    params[0] = hDeltaZBackward->GetMaximumBin();
    params[1] = hDeltaZBackward->GetBinCenter(hDeltaZBackward->GetMaximumBin());
    params[2] = kDeltaZRes;
    TF1 *fgaus = new TF1("fgaus","gaus");
    fgaus->SetParameters(params);
    hDeltaZBackward->Fit("fgaus","E");
    shifts[1] = -fgaus->GetParameter(1);
    shifterrs2[1] = fgaus->GetParError(1)*fgaus->GetParError(1);
    delete fgaus;
  }

  // Check the consistency of the two time delays
  if(TMath::Abs(shifts[0]-shifts[1])>3.*TMath::Sqrt(shifterrs2[0]+shifterrs2[1]))
    ::Warning("AliL1Delay.C","The extracted delays are more than 3 sigma away from each other: %f %f",shifts[0],shifts[1]);

  // Calculated the overall time delay
  Double_t shifterr = 1./TMath::Sqrt(1./shifterrs2[0]+1./shifterrs2[1]);
  Double_t shift = (shifts[0]/shifterrs2[0]+shifts[1]/shifterrs2[1])*shifterr*shifterr;

  ::Info("AliL1Delay.C","");
  ::Info("AliL1Delay.C","=====================================================");
  ::Info("AliL1Delay.C","The measured L1 delay is (%f +- %f) cm",shift,shifterr);
  ::Info("AliL1Delay.C","The measured L1 delay is (%f +- %f) ns",shift*1.e9/param->GetDriftV(),shifterr*1.e9/param->GetDriftV());
  ::Info("AliL1Delay.C","=====================================================");

  delete event;
  esdFile->Close();

  gStyle->SetOptFit(1);

  TCanvas *c1 = new TCanvas("c1","",0,0,700,850);

  TPad *p1 = new TPad("p1","",0,0,1,0.5); p1->Draw();
  p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10);
  p1->SetLogy(1);
  hTrImpact->SetFillColor(4);  hTrImpact->SetXTitle("(cm)");
  hTrImpact->SetStats(kTRUE); hTrImpact->Draw(); c1->cd();

  TPad *p2 = new TPad("p2","",0,0.5,0.5,1); p2->Draw();
  p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10); 
  hDeltaZForward->SetFillColor(4);  hDeltaZForward->SetXTitle("(cm)");
  hDeltaZForward->SetStats(kTRUE); hDeltaZForward->Draw(); c1->cd();

  TPad *p3 = new TPad("p3","",0.5,0.5,1,1); p3->Draw();
  p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10); 
  hDeltaZBackward->SetFillColor(4);  hDeltaZBackward->SetXTitle("(cm)");
  hDeltaZBackward->SetStats(kTRUE); hDeltaZBackward->Draw(); c1->cd();

  TFile f("AliL1Delay.root","RECREATE");
  c1->Write();
  f.Close();

  delete rl;
}

Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) {
  //--------------------------------------------------------------------
  // Correction for the material between the TPC and the ITS
  // (should it belong to the TPC code ?)
  //--------------------------------------------------------------------
  Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ? 
  Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
  Double_t yr=12.8, dr=0.03; // rods ?
  Double_t zm=0.2, dm=0.40;  // membrane
  //Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
  Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)

  if (t->GetX() > riw) {
     if (!t->PropagateTo(riw,diw,x0iw)) return 1;
     if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
     if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
     if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
     //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
     //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r); 
     if (!t->PropagateTo(rs,ds)) return 1;
  } else if (t->GetX() < rs) {
     if (!t->PropagateTo(rs,-ds)) return 1;
     //Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
     //if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r); 
     if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
     if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1;
  } else {
  ::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
    return 1;
  }
  
  return 0;
}

Bool_t PropagateToVertex(AliESDtrack *track, Float_t *vtxXYZ)
{
  // Make an ITS track and propagate it to the vertex
  AliITStrackV2 itstrack(*track);
  if (CorrectForDeadZoneMaterial(&itstrack) != 0) return 0;
  if (!itstrack.PropagateTo(3.,0.0028,65.19)) return 0;
  if (!itstrack.PropagateToVertex()) return 0;

  itstrack.GetXYZ(vtxXYZ);

  return 1;
}

Bool_t PropagateToVertexG(AliESDtrack *track, Float_t *vtxXYZ)
{
  // Make an ITS track and propagate it to the vertex using TGeoManager
  AliITStrackV2 itstrack(*track);
  AliExternalTrackParam etrack(itstrack);
  Double_t r = 3.;
  Double_t xyz0[3],xyz1[3],y,z;
  Double_t param[7];
  Double_t step = 2.;
  for (Double_t x = etrack.X()-step; x > r; x -= step) {
    etrack.GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
    Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
    etrack.RotateTo(alpha);
    etrack.GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);      
    if (!etrack.GetProlongationAt(x,y,z)) return 0;
    xyz1[0] = x*TMath::Cos(alpha)-y*TMath::Sin(alpha);
    xyz1[1] = x*TMath::Sin(alpha)+y*TMath::Cos(alpha);
    xyz1[2] = z;
    AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
    if (!etrack.PropagateTo(x,param[1],param[0])) return 0;
  }
  etrack.PropagateTo(r,1,0);
  if (!etrack.PropagateToDCA(0,0,param[1],0)) return 0;

  etrack.GetXYZ(vtxXYZ);

  return 1;
}
Commit	Line	Data
35d4a90a	1	/////////////////////////////////////////////////////////////////////////////
	2	// //
	3	// This is a macro which measures the time delay of L1 trigger in TPC //
	4	// //
	5	// It reads the ESD tracks and fills histograms with the distance //
	6	// between the primary vertex and the Z position //
	7	// of the point of closest approach between the track and the beam axis. //
	8	// The processing of forward and backward tracks is done separately. //
	9	// The corresponding histograms are fitted with gaussian and the //
	10	// shifts of the Z positions are extracted. //
	11	// The L1 time delay is taken as an average of the forward and backward //
	12	// (with opposite sign) shifts divided by the drift velocity. //
	13	// We assume that the ESD tracks are obtained by the TPC tracking stand //
	14	// alone. //
	15	// The propagation to the vertex can be done either with or without //
	16	// TGeoManager. //
	17	// //
	18	// Cvetan.Cheshkov@cern.ch //
	19	// //
	20	/////////////////////////////////////////////////////////////////////////////
	21
	22	#if !defined(__CINT__) \|\| defined(__MAKECINT__)
	23	#include <TMath.h>
	24	#include <TError.h>
	25	#include <Riostream.h>
	26	#include <TH1F.h>
	27	#include <TF1.h>
	28	#include <TTree.h>
	29	#include <TCanvas.h>
	30	#include <TFile.h>
	31	#include <TStyle.h>
	32	#include <TGeoManager.h>
	33	#include "AliRunLoader.h"
	34	#include "AliRun.h"
	35	#include "AliESD.h"
	36	#include "AliTracker.h"
	37	#include "AliTPCParam.h"
	38	#include "AliMagFMaps.h"
	39	#include "AliITStrackV2.h"
	40	#endif
	41
	42	Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t);
	43	Bool_t PropagateToVertex(AliESDtrack track, Float_t vtxXYZ);
	44	Bool_t PropagateToVertexG(AliESDtrack track, Float_t vtxXYZ);
	45
	46	void AliL1Delay(const Char_t esdfilename = "./AliESDs.root", const Char_t galicefilename = "./galice.root", Bool_t withTGeo = kFALSE, const Char_t *geomfilename = "./geometry.root")
	47	{
	48	const Int_t kMinNClusters = 0;
	49	const Double_t kPtMin = 0.5;
	50	const Double_t kMaxImpact = 0.3;
	51	const Double_t kDeltaZRes = 0.3;
	52	const Double_t kZRange = 20.;
	53
	54	// Book histograms
	55	Int_t NBins = (Int_t)(2.kZRange/(0.5kDeltaZRes));
	56	TH1F *hDeltaZForward = new TH1F("hDeltaZForward","Longitudinal distance to the vertex (forward tracks)",NBins,-kZRange,kZRange);
	57	TH1F *hDeltaZBackward = new TH1F("hDeltaZBackward","Longitudinal distance to the vertex (backward tracks)",NBins,-kZRange,kZRange);
	58	TH1F hTrImpact = new TH1F("hTrImpact","Transverse impact parameter (all tracks)",100,0,30.kMaxImpact);
	59
	60	// Open RunLoader
	61	AliRunLoader *rl = AliRunLoader::Open(galicefilename);
	62	if (!rl) {
	63	::Error("AliL1Delay.C","Can't start session !");
	64	return;
65	}
66	rl->LoadgAlice();
67	gAlice = rl->GetAliRun();
68
69	// Set magnetic field
70	AliMagF* field = gAlice->Field();
71	AliTracker::SetFieldMap(field,kTRUE);
72	AliExternalTrackParam::SetFieldMap(field);
73	AliExternalTrackParam::SetNonuniformFieldTracking();
74	const Float_t sfield = field->SolenoidField();
75
76	// GetGeo manager
77	if(withTGeo)
78	{
79	TFile *geoFile = TFile::Open(geomfilename);
80	if (!geoFile \|\| !geoFile->IsOpen()) {
81	::Error("AliL1Delay.C","Can't open %s !",geomfilename);
82	return;
83	}
84	gGeoManager = (TGeoManager *)geoFile->Get("Geo");
85	if(!gGeoManager) {
86	::Error("AliL1Delay.C","Can't find TGeoManager !");
87	return;
88	}
89	}
90
91	// Get X positions of the pad-rows
92	TDirectory* saveDir = gDirectory;
93	rl->CdGAFile();
94	AliTPCParam* param = (AliTPCParam*) gDirectory->Get("75x40_100x60_150x60");
95	if (!param) {
96	::Error("AliL1Delay.C","No TPC parameters found !");
97	return;
98	}
99	Int_t nRowLow = param->GetNRowLow();
100	Int_t nRowUp = param->GetNRowUp();
101	Float_t xRow[159];
102	for (Int_t i=0;i<nRowLow;i++){
103	xRow[i] = param->GetPadRowRadiiLow(i);
104	}
105	for (Int_t i=0;i<nRowUp;i++){
106	xRow[i+nRowLow] = param->GetPadRowRadiiUp(i);
107	}
108	saveDir->cd();
109
110	// Open file with ESDs
111	TFile *esdFile = TFile::Open(esdfilename);
112	if (!esdFile \|\| !esdFile->IsOpen()) {
113	::Error("AliL1Delay.C","Can't open %s !",esdfilename);
114	return;
115	}
116	AliESD* event = new AliESD;
117	TTree* esdTree = (TTree*) esdFile->Get("esdTree");
118	if (!esdTree) {
119	::Error("AliL1Delay.C","No ESD tree found !");
120	return;
121	}
122	esdTree->SetBranchAddress("ESD", &event);
123
124	// Init PID
125	AliPID pid;
126
127	Int_t nEvent = esdTree->GetEntries();
128
129	// Loop over events
130	for(Int_t iEvent = 0; iEvent<nEvent; iEvent++)
131	{
132	esdTree->GetEvent(iEvent);
133	const AliESDVertex *esdVtx = event->GetVertex();
134	Double_t zVtx = esdVtx->GetZv();
135	if(zVtx == 0.) continue; // Vertex is not found. Skip the event.
136	Int_t nTrk=event->GetNumberOfTracks();
137
138	::Info("AliL1Delay.C","Event %d : Z vertex = %f \| Number of tracks = %d",iEvent,zVtx,nTrk);
139
140	for(Int_t iTrk=0; iTrk<nTrk; iTrk++)
141	{
142	AliESDtrack *track = event->GetTrack(iTrk);
143	if(!track) continue;
144
145	// Track selection
146	if((track->GetStatus()&AliESDtrack::kTPCrefit)==0) continue;
147	if(track->GetTPCclusters((Int_t)0x0)<(kMinNClusters*3)) continue;
148	if(track->GetP()<kPtMin) continue;
149
150	Int_t firstRow = (Int_t)(track->GetTPCPoints(0)+0.5);
151	Int_t lastRow = (Int_t)(track->GetTPCPoints(2)+0.5);
152	Double_t firstXYZ[3];
153	Double_t lastXYZ[3];
154	track->GetXYZAt(xRow[firstRow], sfield, firstXYZ);
155	track->GetXYZAt(xRow[lastRow], sfield, lastXYZ);
156
157	// Select if the track is forward or backward one
158	Bool_t IsForward;
159	if(firstXYZ[2] > 0 && lastXYZ[2] > 0)
160	IsForward = kTRUE;
161	else if(firstXYZ[2] < 0 && lastXYZ[2] < 0)
162	IsForward = kFALSE;
163	else
164	continue;
165
166	// Propagate the track to the vertex
167	Float_t vtxXYZ[3];
168	if(withTGeo) {
169	if(PropagateToVertexG(track,vtxXYZ) == 0) continue;
170	}
171	else {
172	if(PropagateToVertex(track,vtxXYZ) == 0) continue;
173	}
174
175	// Get the position at point of closest approach to the vertex
176	Float_t impact = TMath::Sqrt(vtxXYZ[0]vtxXYZ[0]+vtxXYZ[1]vtxXYZ[1]);
177	hTrImpact->Fill(impact);
178	// Select primary tracks
179	if(impact > kMaxImpact) continue;
180
181	if (IsForward)
182	hDeltaZForward->Fill(vtxXYZ[2]-zVtx);
183	else
184	hDeltaZBackward->Fill(vtxXYZ[2]-zVtx);
185	}
186	}
187
188	// delete event;
189	// esdFile->Close();
190
191	// Check track propagation
192	TF1 *fexpo = new TF1("fexpo","expo");
193	hTrImpact->Fit("fexpo","E");
194	Double_t slope = fexpo->GetParameter(1);
195	if(slope > 3.*kMaxImpact)
196	::Warning("AliL1Delay.C","The transverse impact parameter distribution is too broad: %f +- %f",slope,fexpo->GetParError(1));
197	delete fexpo;
198
199	// Fit histograms and extract L1 time delay
200	Double_t shifts[2],shifterrs2[2];
201	{
202	Double_t params[3];
203	params[0] = hDeltaZForward->GetMaximumBin();
204	params[1] = hDeltaZForward->GetBinCenter(hDeltaZForward->GetMaximumBin());
205	params[2] = kDeltaZRes;
206	TF1 *fgaus = new TF1("fgaus","gaus");
207	fgaus->SetParameters(params);
208	hDeltaZForward->Fit("fgaus","E");
209	shifts[0] = fgaus->GetParameter(1);
210	shifterrs2[0] = fgaus->GetParError(1)*fgaus->GetParError(1);
211	delete fgaus;
212	}
213	{
214	Double_t params[3];
215	params[0] = hDeltaZBackward->GetMaximumBin();
216	params[1] = hDeltaZBackward->GetBinCenter(hDeltaZBackward->GetMaximumBin());
217	params[2] = kDeltaZRes;
218	TF1 *fgaus = new TF1("fgaus","gaus");
219	fgaus->SetParameters(params);
220	hDeltaZBackward->Fit("fgaus","E");
221	shifts[1] = -fgaus->GetParameter(1);
222	shifterrs2[1] = fgaus->GetParError(1)*fgaus->GetParError(1);
223	delete fgaus;
224	}
225
226	// Check the consistency of the two time delays
227	if(TMath::Abs(shifts[0]-shifts[1])>3.*TMath::Sqrt(shifterrs2[0]+shifterrs2[1]))
228	::Warning("AliL1Delay.C","The extracted delays are more than 3 sigma away from each other: %f %f",shifts[0],shifts[1]);
229
230	// Calculated the overall time delay
231	Double_t shifterr = 1./TMath::Sqrt(1./shifterrs2[0]+1./shifterrs2[1]);
232	Double_t shift = (shifts[0]/shifterrs2[0]+shifts[1]/shifterrs2[1])shifterrshifterr;
233
234	::Info("AliL1Delay.C","");
235	::Info("AliL1Delay.C","=====================================================");
236	::Info("AliL1Delay.C","The measured L1 delay is (%f +- %f) cm",shift,shifterr);
237	::Info("AliL1Delay.C","The measured L1 delay is (%f +- %f) ns",shift1.e9/param->GetDriftV(),shifterr1.e9/param->GetDriftV());
238	::Info("AliL1Delay.C","=====================================================");
239
240	delete event;
241	esdFile->Close();
242
243	gStyle->SetOptFit(1);
244
245	TCanvas *c1 = new TCanvas("c1","",0,0,700,850);
246
247	TPad *p1 = new TPad("p1","",0,0,1,0.5); p1->Draw();
248	p1->cd(); p1->SetFillColor(42); p1->SetFrameFillColor(10);
249	p1->SetLogy(1);
250	hTrImpact->SetFillColor(4); hTrImpact->SetXTitle("(cm)");
251	hTrImpact->SetStats(kTRUE); hTrImpact->Draw(); c1->cd();
252
253	TPad *p2 = new TPad("p2","",0,0.5,0.5,1); p2->Draw();
254	p2->cd(); p2->SetFillColor(42); p2->SetFrameFillColor(10);
255	hDeltaZForward->SetFillColor(4); hDeltaZForward->SetXTitle("(cm)");
256	hDeltaZForward->SetStats(kTRUE); hDeltaZForward->Draw(); c1->cd();
257
258	TPad *p3 = new TPad("p3","",0.5,0.5,1,1); p3->Draw();
259	p3->cd(); p3->SetFillColor(42); p3->SetFrameFillColor(10);
260	hDeltaZBackward->SetFillColor(4); hDeltaZBackward->SetXTitle("(cm)");
261	hDeltaZBackward->SetStats(kTRUE); hDeltaZBackward->Draw(); c1->cd();
262
263	TFile f("AliL1Delay.root","RECREATE");
264	c1->Write();
265	f.Close();
266
267	delete rl;
268	}
269
270	Int_t CorrectForDeadZoneMaterial(AliITStrackV2 *t) {
271	//--------------------------------------------------------------------
272	// Correction for the material between the TPC and the ITS
273	// (should it belong to the TPC code ?)
274	//--------------------------------------------------------------------
275	Double_t riw=80., diw=0.0053, x0iw=30; // TPC inner wall ?
276	Double_t rcd=61., dcd=0.0053, x0cd=30; // TPC "central drum" ?
277	Double_t yr=12.8, dr=0.03; // rods ?
278	Double_t zm=0.2, dm=0.40; // membrane
279	//Double_t rr=52., dr=0.19, x0r=24., yyr=7.77; //rails
280	Double_t rs=50., ds=0.001; // something belonging to the ITS (screen ?)
281
282	if (t->GetX() > riw) {
283	if (!t->PropagateTo(riw,diw,x0iw)) return 1;
284	if (TMath::Abs(t->GetY())>yr) t->CorrectForMaterial(dr);
285	if (TMath::Abs(t->GetZ())<zm) t->CorrectForMaterial(dm);
286	if (!t->PropagateTo(rcd,dcd,x0cd)) return 1;
287	//Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
288	//if (TMath::Abs(y)<yyr) t->PropagateTo(rr,dr,x0r);
289	if (!t->PropagateTo(rs,ds)) return 1;
290	} else if (t->GetX() < rs) {
291	if (!t->PropagateTo(rs,-ds)) return 1;
292	//Double_t x,y,z; t->GetGlobalXYZat(rr,x,y,z);
293	//if (TMath::Abs(y)<yyr) t->PropagateTo(rr,-dr,x0r);
294	if (!t->PropagateTo(rcd,-dcd,x0cd)) return 1;
295	if (!t->PropagateTo(riw+0.001,-diw,x0iw)) return 1;
296	} else {
297	::Error("CorrectForDeadZoneMaterial","track is already in the dead zone !");
298	return 1;
299	}
300
301	return 0;
302	}
303
304	Bool_t PropagateToVertex(AliESDtrack track, Float_t vtxXYZ)
305	{
306	// Make an ITS track and propagate it to the vertex
307	AliITStrackV2 itstrack(*track);
308	if (CorrectForDeadZoneMaterial(&itstrack) != 0) return 0;
309	if (!itstrack.PropagateTo(3.,0.0028,65.19)) return 0;
310	if (!itstrack.PropagateToVertex()) return 0;
311
312	itstrack.GetXYZ(vtxXYZ);
313
314	return 1;
315	}
316
317	Bool_t PropagateToVertexG(AliESDtrack track, Float_t vtxXYZ)
318	{
319	// Make an ITS track and propagate it to the vertex using TGeoManager
320	AliITStrackV2 itstrack(*track);
321	AliExternalTrackParam etrack(itstrack);
322	Double_t r = 3.;
323	Double_t xyz0[3],xyz1[3],y,z;
324	Double_t param[7];
325	Double_t step = 2.;
326	for (Double_t x = etrack.X()-step; x > r; x -= step) {
327	etrack.GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
328	Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
329	etrack.RotateTo(alpha);
330	etrack.GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
331	if (!etrack.GetProlongationAt(x,y,z)) return 0;
332	xyz1[0] = xTMath::Cos(alpha)-yTMath::Sin(alpha);
333	xyz1[1] = xTMath::Sin(alpha)+yTMath::Cos(alpha);
334	xyz1[2] = z;
335	AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
336	if (!etrack.PropagateTo(x,param[1],param[0])) return 0;
337	}
338	etrack.PropagateTo(r,1,0);
339	if (!etrack.PropagateToDCA(0,0,param[1],0)) return 0;
340
341	etrack.GetXYZ(vtxXYZ);
342
343	return 1;
344	}