[u/mrichter/AliRoot.git] / TPC / AliTPCcalibTime.cxx

/**************************************************************************
 * 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.                  *
 **************************************************************************/

/*
    Comments to be written here:
    1. What do we calibrate.

Time dependence of gain and drift velocity in order to account for changes in: temperature, pressure, gas composition.

  AliTPCcalibTime *calibTime = new AliTPCcalibTime("cosmicTime","cosmicTime",0, 1213.9e+06, 1213.96e+06, 0.04e+04, 0.04e+04);


    2. How to interpret results
    3. Simple example

a.) determine the required time range:

AliXRDPROOFtoolkit tool;
TChain * chain = tool.MakeChain("pass2.txt","esdTree",0,6000);
chain->Draw("GetTimeStamp()")

b) analyse calibration object on Proof in calibration train 

AliTPCcalibTime *calibTime = new AliTPCcalibTime("cosmicTime","cosmicTime", StartTimeStamp, EndTimeStamp, IntegrationTimeVdrift, IntegrationTimeDeDx);

c) plot results

TFile f("CalibObjects.root");
AliTPCcalibTime *cal = f->Get("TPCCalib")->FindObject("cosmicTime");
cal->GetHistVdrift()->Projection(1,0)->Draw()

    4. Analysis using debug streamers.    

*/


#include "Riostream.h"
#include "TChain.h"
#include "TTree.h"
#include "TH1F.h"
#include "TH2F.h"
#include "TH3F.h"
#include "THnSparse.h"
#include "TList.h"
#include "TMath.h"
#include "TCanvas.h"
#include "TFile.h"
#include "TF1.h"
#include "TVectorD.h"
#include "TProfile.h"
#include "TGraphErrors.h"
#include "TCanvas.h"

#include "AliTPCclusterMI.h"
#include "AliTPCseed.h"
#include "AliESDVertex.h"
#include "AliESDEvent.h"
#include "AliESDfriend.h"
#include "AliESDInputHandler.h"
#include "AliAnalysisManager.h"

#include "AliTracker.h"
#include "AliMagFMaps.h"
#include "AliTPCCalROC.h"

#include "AliLog.h"

#include "AliTPCcalibTime.h"

#include "TTreeStream.h"
#include "AliTPCTracklet.h"

ClassImp(AliTPCcalibTime)


AliTPCcalibTime::AliTPCcalibTime() 
  :AliTPCcalibBase(),
   fHistDeDxTgl(0),
   fHistDeDx(0),
   fHistVdrift(0),
   fIntegrationTimeDeDx(0),
   fIntegrationTimeVdrift(0),
   fCutMaxD(5),        // maximal distance in rfi ditection
   fCutTheta(0.03),    // maximal distan theta
   fCutMinDir(-0.99)   // direction vector products

{  
  AliInfo("Default Constructor");  
}


AliTPCcalibTime::AliTPCcalibTime(const Text_t *name, const Text_t *title, ULong64_t TriggerMask, UInt_t StartTime, UInt_t EndTime, Int_t deltaIntegrationTimeDeDx, Int_t deltaIntegrationTimeVdrift)
  :AliTPCcalibBase(),
   fTriggerMask(0),
   fHistDeDxTgl(0),
   fHistDeDx(0),
   fHistVdrift(0),
   fIntegrationTimeDeDx(0),
   fIntegrationTimeVdrift(0),
   fCutMaxD(5),        // maximal distance in rfi ditection
   fCutTheta(0.03),    // maximal distan theta
   fCutMinDir(-0.99)   // direction vector products
{
  
  SetName(name);
  SetTitle(title);

  AliInfo("Non Default Constructor");

  fTriggerMask = TriggerMask;

  fIntegrationTimeDeDx = deltaIntegrationTimeDeDx;
  fIntegrationTimeVdrift = deltaIntegrationTimeVdrift;

  Double_t deltaTime = EndTime - StartTime;
  
  Int_t binsVdrift[2] = {deltaTime/deltaIntegrationTimeVdrift, 100};
  Double_t xminVdrift[2] = {StartTime, -20};
  Double_t xmaxVdrift[2] = {EndTime, 20};
  fHistVdrift = new THnSparseF("HistVdrift","vDrift; time;#Delta z",2,binsVdrift,xminVdrift,xmaxVdrift);

  Int_t binsDeDxTgl[3] = {deltaTime/deltaIntegrationTimeDeDx,30,100};
  Double_t xminDeDxTgl[3] = {StartTime,-1,0.7};
  Double_t xmaxDeDxTgl[3] = {EndTime,1,1.3};
  fHistDeDxTgl = new THnSparseF("HistDeDxTgl","dEdx vs tgl;time;tgl;dEdxUp/dEdxLow",3,binsDeDxTgl,xminDeDxTgl,xmaxDeDxTgl); 

  Int_t binsDeDx[2] = {deltaTime/deltaIntegrationTimeDeDx,100};
  Double_t xminDeDx[2] = {StartTime,1};
  Double_t xmaxDeDx[2] = {EndTime,100};
  fHistDeDx = new THnSparseF("HistDeDx","dEdx l;time;dEdx",2,binsDeDx,xminDeDx,xmaxDeDx);

}


AliTPCcalibTime::~AliTPCcalibTime(){
  //
  //
  //
}

void AliTPCcalibTime::Process(AliESDEvent *event) {
  //
  //
  //
  
  ProcessCosmic(event);

}


void AliTPCcalibTime::ProcessCosmic(AliESDEvent *event) {

  if (!event) {
    Printf("ERROR: ESD not available");
    return;
  }  
  if (event->GetTimeStamp() == 0 ) {
    Printf("no time stamp!");
    return;
  }

  if (fTriggerMask != 0 && event->GetTriggerMask() != fTriggerMask) return;

  UInt_t time = event->GetTimeStamp();

  //
  // Find cosmic pairs
  // 
  // Track0 is choosen in upper TPC part
  // Track1 is choosen in lower TPC part
  //
  Int_t ntracks=event->GetNumberOfTracks();
  if (ntracks==0) return;
  if (ntracks > 10) return; // temporary debug to remove LASER events


  if (GetDebugLevel()>1) printf("Hallo world: Im here\n");
  AliESDfriend *ESDfriend=static_cast<AliESDfriend*>(event->FindListObject("AliESDfriend"));
  
  TObjArray  tpcSeeds(ntracks);
  Double_t vtxx[3]={0,0,0};
  Double_t svtxx[3]={0.000001,0.000001,100.};
  AliESDVertex vtx(vtxx,svtxx);
  //
  // track loop
  //
  for (Int_t i=0;i<ntracks;++i) {
   AliESDtrack *track = event->GetTrack(i);

   const AliExternalTrackParam * trackIn = track->GetInnerParam();
   const AliExternalTrackParam * trackOut = track->GetOuterParam();
   if (!trackIn) continue;
   if (!trackOut) continue;
   
   AliESDfriendTrack *friendTrack = ESDfriend->GetTrack(i);
   TObject *calibObject;
   AliTPCseed *seed = 0;
   for (Int_t l=0;(calibObject=friendTrack->GetCalibObject(l));++l) {
     if ((seed=dynamic_cast<AliTPCseed*>(calibObject))) break;
   }
   if (seed) { 
     tpcSeeds.AddAt(seed,i);
     if (track->GetTPCNcls() > 50) {
       Double_t meanP = 0.5*(trackIn->GetP() + trackOut->GetP());
       Double_t TPCsignal = seed->CookdEdxNorm(0.0,0.6,1,0,159,0x0,kTRUE,kTRUE);
       Double_t vecDeDx[2] = {time, TPCsignal};
       if (meanP > 12) fHistDeDx->Fill(vecDeDx);
     }
   }
  }
  
  if (ntracks<2) return;
  //
  // Find pairs
  //
  for (Int_t i=0;i<ntracks;++i) {
    AliESDtrack *track0 = event->GetTrack(i);     
    // track0 - choosen upper part
    if (!track0) continue;
    if (!track0->GetOuterParam()) continue;
    if (track0->GetOuterParam()->GetAlpha()<0) continue;
    Double_t d1[3];
    track0->GetDirection(d1);    
    for (Int_t j=0;j<ntracks;++j) {
      if (i==j) continue;
       AliESDtrack *track1 = event->GetTrack(j);   
       //track 1 lower part
       if (!track1) continue;
       if (!track1->GetOuterParam()) continue;
       if (track1->GetOuterParam()->GetAlpha()>0) continue;
       //
       Double_t d2[3];
       track1->GetDirection(d2);
      
       AliTPCseed * seed0 = (AliTPCseed*) tpcSeeds.At(i);
       AliTPCseed * seed1 = (AliTPCseed*) tpcSeeds.At(j);
       if (! seed0) continue;
       if (! seed1) continue;
       Float_t dir = (d1[0]*d2[0] + d1[1]*d2[1] + d1[2]*d2[2]);
       Float_t d0  = track0->GetLinearD(0,0);
       Float_t d1  = track1->GetLinearD(0,0);
       //
       // conservative cuts - convergence to be guarantied
       // applying before track propagation
       if (TMath::Abs(d0+d1)>fCutMaxD) continue;   // distance to the 0,0
       if (dir>fCutMinDir) continue;               // direction vector product
       Float_t bz = AliTracker::GetBz();
       Float_t dvertex0[2];   //distance to 0,0
       Float_t dvertex1[2];   //distance to 0,0 
       track0->GetDZ(0,0,0,bz,dvertex0);
       track1->GetDZ(0,0,0,bz,dvertex1);
       if (TMath::Abs(dvertex0[1])>250) continue;
       if (TMath::Abs(dvertex1[1])>250) continue;
       //
       //
       //
       Float_t dmax = TMath::Max(TMath::Abs(d0),TMath::Abs(d1));
       AliExternalTrackParam param0(*track0);
       AliExternalTrackParam param1(*track1);
       //
       // Propagate using Magnetic field and correct fo material budget
       //
       AliTracker::PropagateTrackTo(&param0,dmax+1,0.0005,3,kTRUE);
       AliTracker::PropagateTrackTo(&param1,dmax+1,0.0005,3,kTRUE);
       //
       // Propagate rest to the 0,0 DCA - z should be ignored
       //
       Bool_t b0 = param0.PropagateToDCA(&vtx,bz,1000);
       Bool_t b1 = param1.PropagateToDCA(&vtx,bz,1000);
       //      
       param0.GetDZ(0,0,0,bz,dvertex0);
       param1.GetDZ(0,0,0,bz,dvertex1);
       //
       Double_t xyz0[3];//,pxyz0[3];
       Double_t xyz1[3];//,pxyz1[3];
       param0.GetXYZ(xyz0);
       param1.GetXYZ(xyz1);
       Bool_t isPair = IsPair(&param0,&param1);

       Double_t z0 = track0->GetOuterParam()->GetZ();
       Double_t z1 = track1->GetOuterParam()->GetZ();

       Double_t z0inner = track0->GetInnerParam()->GetZ();
       Double_t z1inner = track1->GetInnerParam()->GetZ();

       if (isPair && z0>0 && z0inner>0 && z1<0 && z1inner<0) {
	 Double_t vecVdrift[2] = {time, param0.GetZ() - param1.GetZ()};
	 
	 if (track0->GetTPCNcls() > 80) fHistVdrift->Fill(vecVdrift);
       }
       if (isPair && z0 > 0 && z1 > 0) {
	 if (track1->GetTPCNcls()> 110 && track0->GetTPCNcls()> 110 && seed1->CookdEdxNorm(0,0.6,1,0,159,0,kFALSE,kTRUE) > 0) {
	   Double_t vecDeDxTgl[3] = {time, track0->GetTgl(), seed0->CookdEdxNorm(0,0.6,1,0,159,0,kFALSE,kTRUE)/seed1->CookdEdxNorm(0,0.6,1,0,159,0,kFALSE,kTRUE)};
	   fHistDeDxTgl->Fill(vecDeDxTgl);
	 }
       }
       
    } // end 2nd order loop        
  } // end 1st order loop

}


void AliTPCcalibTime::Analyze() {

  TH2D * hVdrift = GetHistVdrift()->Projection(1,0);
  

}


Long64_t AliTPCcalibTime::Merge(TCollection *li) {

  TIterator* iter = li->MakeIterator();
  AliTPCcalibTime* cal = 0;

  while ((cal = (AliTPCcalibTime*)iter->Next())) {
    if (!cal->InheritsFrom(AliTPCcalibTime::Class())) {
      Error("Merge","Attempt to add object of class %s to a %s", cal->ClassName(), this->ClassName());
      return -1;
    }

    // add histograms here...
    fHistDeDxTgl->Add(cal->GetHistDeDxVsTgl());
    fHistVdrift->Add(cal->GetHistVdrift());
    fHistDeDx->Add(cal->GetHistDeDx());

  }
  
  return 0;
  
}


Bool_t  AliTPCcalibTime::IsPair(AliExternalTrackParam *tr0, AliExternalTrackParam *tr1){
  //
  //
  /*
  // 0. Same direction - OPOSITE  - cutDir +cutT    
  TCut cutDir("cutDir","dir<-0.99")
  // 1. 
  TCut cutT("cutT","abs(Tr1.fP[3]+Tr0.fP[3])<0.03")
  //
  // 2. The same rphi 
  TCut cutD("cutD","abs(Tr0.fP[0]+Tr1.fP[0])<5")
  //
  //
  //
  TCut cutPt("cutPt","abs(Tr1.fP[4]+Tr0.fP[4])<1&&abs(Tr0.fP[4])+abs(Tr1.fP[4])<10");  
  // 1/Pt diff cut
  */
  const Double_t *p0 = tr0->GetParameter();
  const Double_t *p1 = tr1->GetParameter();
  if (TMath::Abs(p0[3]+p1[3])>fCutTheta) return kFALSE;
  if (TMath::Abs(p0[0]+p1[0])>fCutMaxD)  return kFALSE;
  Double_t d0[3], d1[3];
  tr0->GetDirection(d0);    
  tr1->GetDirection(d1);       
  if (d0[0]*d1[0] + d0[1]*d1[1] + d0[2]*d1[2] >fCutMinDir) return kFALSE;
  //
  return kTRUE;  
}
Commit	Line	Data
c74c5f6c	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/*
	17	Comments to be written here:
	18	1. What do we calibrate.
	19
	20	Time dependence of gain and drift velocity in order to account for changes in: temperature, pressure, gas composition.
	21
	22	AliTPCcalibTime *calibTime = new AliTPCcalibTime("cosmicTime","cosmicTime",0, 1213.9e+06, 1213.96e+06, 0.04e+04, 0.04e+04);
	23
	24
	25	2. How to interpret results
	26	3. Simple example
	27
	28	a.) determine the required time range:
	29
	30	AliXRDPROOFtoolkit tool;
	31	TChain * chain = tool.MakeChain("pass2.txt","esdTree",0,6000);
	32	chain->Draw("GetTimeStamp()")
	33
	34	b) analyse calibration object on Proof in calibration train
	35
	36	AliTPCcalibTime *calibTime = new AliTPCcalibTime("cosmicTime","cosmicTime", StartTimeStamp, EndTimeStamp, IntegrationTimeVdrift, IntegrationTimeDeDx);
	37
	38	c) plot results
	39
	40	TFile f("CalibObjects.root");
	41	AliTPCcalibTime *cal = f->Get("TPCCalib")->FindObject("cosmicTime");
	42	cal->GetHistVdrift()->Projection(1,0)->Draw()
	43
	44	4. Analysis using debug streamers.
	45
	46	*/
	47
	48
	49	#include "Riostream.h"
	50	#include "TChain.h"
	51	#include "TTree.h"
	52	#include "TH1F.h"
	53	#include "TH2F.h"
	54	#include "TH3F.h"
	55	#include "THnSparse.h"
	56	#include "TList.h"
	57	#include "TMath.h"
	58	#include "TCanvas.h"
	59	#include "TFile.h"
	60	#include "TF1.h"
	61	#include "TVectorD.h"
	62	#include "TProfile.h"
	63	#include "TGraphErrors.h"
	64	#include "TCanvas.h"
65
66	#include "AliTPCclusterMI.h"
67	#include "AliTPCseed.h"
68	#include "AliESDVertex.h"
69	#include "AliESDEvent.h"
70	#include "AliESDfriend.h"
71	#include "AliESDInputHandler.h"
72	#include "AliAnalysisManager.h"
73
74	#include "AliTracker.h"
75	#include "AliMagFMaps.h"
76	#include "AliTPCCalROC.h"
77
78	#include "AliLog.h"
79
80	#include "AliTPCcalibTime.h"
81
82	#include "TTreeStream.h"
83	#include "AliTPCTracklet.h"
84
85	ClassImp(AliTPCcalibTime)
86
87
88	AliTPCcalibTime::AliTPCcalibTime()
89	:AliTPCcalibBase(),
90	fHistDeDxTgl(0),
91	fHistDeDx(0),
92	fHistVdrift(0),
93	fIntegrationTimeDeDx(0),
94	fIntegrationTimeVdrift(0),
95	fCutMaxD(5), // maximal distance in rfi ditection
96	fCutTheta(0.03), // maximal distan theta
97	fCutMinDir(-0.99) // direction vector products
98
99	{
100	AliInfo("Default Constructor");
101	}
102
103
104	AliTPCcalibTime::AliTPCcalibTime(const Text_t name, const Text_t title, ULong64_t TriggerMask, UInt_t StartTime, UInt_t EndTime, Int_t deltaIntegrationTimeDeDx, Int_t deltaIntegrationTimeVdrift)
105	:AliTPCcalibBase(),
106	fTriggerMask(0),
107	fHistDeDxTgl(0),
108	fHistDeDx(0),
109	fHistVdrift(0),
110	fIntegrationTimeDeDx(0),
111	fIntegrationTimeVdrift(0),
112	fCutMaxD(5), // maximal distance in rfi ditection
113	fCutTheta(0.03), // maximal distan theta
114	fCutMinDir(-0.99) // direction vector products
115	{
116
117	SetName(name);
118	SetTitle(title);
119
120	AliInfo("Non Default Constructor");
121
122	fTriggerMask = TriggerMask;
123
124	fIntegrationTimeDeDx = deltaIntegrationTimeDeDx;
125	fIntegrationTimeVdrift = deltaIntegrationTimeVdrift;
126
127	Double_t deltaTime = EndTime - StartTime;
128
129	Int_t binsVdrift[2] = {deltaTime/deltaIntegrationTimeVdrift, 100};
130	Double_t xminVdrift[2] = {StartTime, -20};
131	Double_t xmaxVdrift[2] = {EndTime, 20};
132	fHistVdrift = new THnSparseF("HistVdrift","vDrift; time;#Delta z",2,binsVdrift,xminVdrift,xmaxVdrift);
133
134	Int_t binsDeDxTgl[3] = {deltaTime/deltaIntegrationTimeDeDx,30,100};
135	Double_t xminDeDxTgl[3] = {StartTime,-1,0.7};
136	Double_t xmaxDeDxTgl[3] = {EndTime,1,1.3};
137	fHistDeDxTgl = new THnSparseF("HistDeDxTgl","dEdx vs tgl;time;tgl;dEdxUp/dEdxLow",3,binsDeDxTgl,xminDeDxTgl,xmaxDeDxTgl);
138
139	Int_t binsDeDx[2] = {deltaTime/deltaIntegrationTimeDeDx,100};
140	Double_t xminDeDx[2] = {StartTime,1};
141	Double_t xmaxDeDx[2] = {EndTime,100};
142	fHistDeDx = new THnSparseF("HistDeDx","dEdx l;time;dEdx",2,binsDeDx,xminDeDx,xmaxDeDx);
143
144	}
145
146
147
148	AliTPCcalibTime::~AliTPCcalibTime(){
149	//
150	//
151	//
152	}
153
154	void AliTPCcalibTime::Process(AliESDEvent *event) {
155	//
156	//
157	//
158
159	ProcessCosmic(event);
160
161	}
162
163
164
165	void AliTPCcalibTime::ProcessCosmic(AliESDEvent *event) {
166
167	if (!event) {
168	Printf("ERROR: ESD not available");
169	return;
170	}
171	if (event->GetTimeStamp() == 0 ) {
172	Printf("no time stamp!");
173	return;
174	}
175
176	if (fTriggerMask != 0 && event->GetTriggerMask() != fTriggerMask) return;
177
178	UInt_t time = event->GetTimeStamp();
179
180	//
181	// Find cosmic pairs
182	//
183	// Track0 is choosen in upper TPC part
184	// Track1 is choosen in lower TPC part
185	//
186	Int_t ntracks=event->GetNumberOfTracks();
187	if (ntracks==0) return;
188	if (ntracks > 10) return; // temporary debug to remove LASER events
189
190
191	if (GetDebugLevel()>1) printf("Hallo world: Im here\n");
192	AliESDfriend ESDfriend=static_cast<AliESDfriend>(event->FindListObject("AliESDfriend"));
193
194	TObjArray tpcSeeds(ntracks);
195	Double_t vtxx[3]={0,0,0};
196	Double_t svtxx[3]={0.000001,0.000001,100.};
197	AliESDVertex vtx(vtxx,svtxx);
198	//
199	// track loop
200	//
201	for (Int_t i=0;i<ntracks;++i) {
202	AliESDtrack *track = event->GetTrack(i);
203
204	const AliExternalTrackParam * trackIn = track->GetInnerParam();
205	const AliExternalTrackParam * trackOut = track->GetOuterParam();
206	if (!trackIn) continue;
207	if (!trackOut) continue;
208
209	AliESDfriendTrack *friendTrack = ESDfriend->GetTrack(i);
210	TObject *calibObject;
211	AliTPCseed *seed = 0;
212	for (Int_t l=0;(calibObject=friendTrack->GetCalibObject(l));++l) {
213	if ((seed=dynamic_cast<AliTPCseed*>(calibObject))) break;
214	}
215	if (seed) {
216	tpcSeeds.AddAt(seed,i);
217	if (track->GetTPCNcls() > 50) {
218	Double_t meanP = 0.5*(trackIn->GetP() + trackOut->GetP());
219	Double_t TPCsignal = seed->CookdEdxNorm(0.0,0.6,1,0,159,0x0,kTRUE,kTRUE);
220	Double_t vecDeDx[2] = {time, TPCsignal};
221	if (meanP > 12) fHistDeDx->Fill(vecDeDx);
222	}
223	}
224	}
225
226	if (ntracks<2) return;
227	//
228	// Find pairs
229	//
230	for (Int_t i=0;i<ntracks;++i) {
231	AliESDtrack *track0 = event->GetTrack(i);
232	// track0 - choosen upper part
233	if (!track0) continue;
234	if (!track0->GetOuterParam()) continue;
235	if (track0->GetOuterParam()->GetAlpha()<0) continue;
236	Double_t d1[3];
237	track0->GetDirection(d1);
238	for (Int_t j=0;j<ntracks;++j) {
239	if (i==j) continue;
240	AliESDtrack *track1 = event->GetTrack(j);
241	//track 1 lower part
242	if (!track1) continue;
243	if (!track1->GetOuterParam()) continue;
244	if (track1->GetOuterParam()->GetAlpha()>0) continue;
245	//
246	Double_t d2[3];
247	track1->GetDirection(d2);
248
249	AliTPCseed * seed0 = (AliTPCseed*) tpcSeeds.At(i);
250	AliTPCseed * seed1 = (AliTPCseed*) tpcSeeds.At(j);
251	if (! seed0) continue;
252	if (! seed1) continue;
253	Float_t dir = (d1[0]d2[0] + d1[1]d2[1] + d1[2]*d2[2]);
254	Float_t d0 = track0->GetLinearD(0,0);
255	Float_t d1 = track1->GetLinearD(0,0);
256	//
257	// conservative cuts - convergence to be guarantied
258	// applying before track propagation
259	if (TMath::Abs(d0+d1)>fCutMaxD) continue; // distance to the 0,0
260	if (dir>fCutMinDir) continue; // direction vector product
261	Float_t bz = AliTracker::GetBz();
262	Float_t dvertex0[2]; //distance to 0,0
263	Float_t dvertex1[2]; //distance to 0,0
264	track0->GetDZ(0,0,0,bz,dvertex0);
265	track1->GetDZ(0,0,0,bz,dvertex1);
266	if (TMath::Abs(dvertex0[1])>250) continue;
267	if (TMath::Abs(dvertex1[1])>250) continue;
268	//
269	//
270	//
271	Float_t dmax = TMath::Max(TMath::Abs(d0),TMath::Abs(d1));
272	AliExternalTrackParam param0(*track0);
273	AliExternalTrackParam param1(*track1);
274	//
275	// Propagate using Magnetic field and correct fo material budget
276	//
277	AliTracker::PropagateTrackTo(&param0,dmax+1,0.0005,3,kTRUE);
278	AliTracker::PropagateTrackTo(&param1,dmax+1,0.0005,3,kTRUE);
279	//
280	// Propagate rest to the 0,0 DCA - z should be ignored
281	//
282	Bool_t b0 = param0.PropagateToDCA(&vtx,bz,1000);
283	Bool_t b1 = param1.PropagateToDCA(&vtx,bz,1000);
284	//
285	param0.GetDZ(0,0,0,bz,dvertex0);
286	param1.GetDZ(0,0,0,bz,dvertex1);
287	//
288	Double_t xyz0[3];//,pxyz0[3];
289	Double_t xyz1[3];//,pxyz1[3];
290	param0.GetXYZ(xyz0);
291	param1.GetXYZ(xyz1);
292	Bool_t isPair = IsPair(&param0,&param1);
293
294	Double_t z0 = track0->GetOuterParam()->GetZ();
295	Double_t z1 = track1->GetOuterParam()->GetZ();
296
297	Double_t z0inner = track0->GetInnerParam()->GetZ();
298	Double_t z1inner = track1->GetInnerParam()->GetZ();
299
300	if (isPair && z0>0 && z0inner>0 && z1<0 && z1inner<0) {
301	Double_t vecVdrift[2] = {time, param0.GetZ() - param1.GetZ()};
302
303	if (track0->GetTPCNcls() > 80) fHistVdrift->Fill(vecVdrift);
304	}
305	if (isPair && z0 > 0 && z1 > 0) {
306	if (track1->GetTPCNcls()> 110 && track0->GetTPCNcls()> 110 && seed1->CookdEdxNorm(0,0.6,1,0,159,0,kFALSE,kTRUE) > 0) {
307	Double_t vecDeDxTgl[3] = {time, track0->GetTgl(), seed0->CookdEdxNorm(0,0.6,1,0,159,0,kFALSE,kTRUE)/seed1->CookdEdxNorm(0,0.6,1,0,159,0,kFALSE,kTRUE)};
308	fHistDeDxTgl->Fill(vecDeDxTgl);
309	}
310	}
311
312	} // end 2nd order loop
313	} // end 1st order loop
314
315	}
316
317
318	void AliTPCcalibTime::Analyze() {
319
320	TH2D * hVdrift = GetHistVdrift()->Projection(1,0);
321
322
323	}
324
325
326	Long64_t AliTPCcalibTime::Merge(TCollection *li) {
327
328	TIterator* iter = li->MakeIterator();
329	AliTPCcalibTime* cal = 0;
330
331	while ((cal = (AliTPCcalibTime*)iter->Next())) {
332	if (!cal->InheritsFrom(AliTPCcalibTime::Class())) {
333	Error("Merge","Attempt to add object of class %s to a %s", cal->ClassName(), this->ClassName());
334	return -1;
335	}
336
337	// add histograms here...
338	fHistDeDxTgl->Add(cal->GetHistDeDxVsTgl());
339	fHistVdrift->Add(cal->GetHistVdrift());
340	fHistDeDx->Add(cal->GetHistDeDx());
341
342	}
343
344	return 0;
345
346	}
347
348
349
350	Bool_t AliTPCcalibTime::IsPair(AliExternalTrackParam tr0, AliExternalTrackParam tr1){
351	//
352	//
353	/*
354	// 0. Same direction - OPOSITE - cutDir +cutT
355	TCut cutDir("cutDir","dir<-0.99")
356	// 1.
357	TCut cutT("cutT","abs(Tr1.fP[3]+Tr0.fP[3])<0.03")
358	//
359	// 2. The same rphi
360	TCut cutD("cutD","abs(Tr0.fP[0]+Tr1.fP[0])<5")
361	//
362	//
363	//
364	TCut cutPt("cutPt","abs(Tr1.fP[4]+Tr0.fP[4])<1&&abs(Tr0.fP[4])+abs(Tr1.fP[4])<10");
365	// 1/Pt diff cut
366	*/
367	const Double_t *p0 = tr0->GetParameter();
368	const Double_t *p1 = tr1->GetParameter();
369	if (TMath::Abs(p0[3]+p1[3])>fCutTheta) return kFALSE;
370	if (TMath::Abs(p0[0]+p1[0])>fCutMaxD) return kFALSE;
371	Double_t d0[3], d1[3];
372	tr0->GetDirection(d0);
373	tr1->GetDirection(d1);
374	if (d0[0]d1[0] + d0[1]d1[1] + d0[2]*d1[2] >fCutMinDir) return kFALSE;
375	//
376	return kTRUE;
377	}