[u/mrichter/AliRoot.git] / TOF / AliTOFtrack.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.                  *
 **************************************************************************/

/* $Id$ */

/////////////////////////////////////////////////////////////////////////////
//                                                                         //
// AliTOFtrack class                                                       //
//                                                                         //
// Authors: Bologna-CERN-ITEP-Salerno Group                                //
//                                                                         //
// Description: class for handling ESD extracted tracks for TOF matching.  //
//                                                                         //
/////////////////////////////////////////////////////////////////////////////

#include "AliESDtrack.h" 
#include "AliTracker.h" 

#include "AliTOFGeometry.h"
#include "AliTOFtrack.h" 

ClassImp(AliTOFtrack)

//_____________________________________________________________________________
AliTOFtrack::AliTOFtrack() : 
  AliKalmanTrack(),
  fSeedInd(-1),
  fSeedLab(-1)
{
  //
  // Default constructor.
  //
}                                

//_____________________________________________________________________________
AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) : 
  AliKalmanTrack(t),
  fSeedInd(t.fSeedInd),
  fSeedLab(t.fSeedLab) 
{
  //
  // Copy constructor.
  //
}                                

//_____________________________________________________________________________
AliTOFtrack::AliTOFtrack(const AliESDtrack& t) :
  AliKalmanTrack(), 
  fSeedInd(-1),
  fSeedLab(-1) 
{
  //
  // Constructor from AliESDtrack
  //
  SetLabel(t.GetLabel());
  SetChi2(0.);
  SetMass(t.GetMass());

  Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());

  if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
  StartTimeIntegral();
  Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
  SetIntegratedLength(t.GetIntegratedLength());

}              

//____________________________________________________________________________
AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/*source*/)
{
  // ass. op.

  return *this;

}

//_____________________________________________________________________________
Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t /*x0*/,Double_t /*rho*/)
 {
  //
  // Propagates a track of particle with mass=pm to a reference plane 
  // defined by x=xk through media of density=rho and radiationLength=x0
  //

  if (xk == GetX()) return kTRUE;
  
  Double_t oldX=GetX();//, oldY=GetY(), oldZ=GetZ();
  Double_t start[3], end[3], mparam[7];

  /* get start position */
  GetXYZ(start);

  /* propagate the track */
  Double_t b[3];GetBxByBz(b);
  if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
  // OLD used code
  //Double_t bz=GetBz();
  //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;

  /* get end position */
  GetXYZ(end);

  /* add time step to integral */
#if 0 /*** OLD ***/
  Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) + 
                           (GetY()-oldY)*(GetY()-oldY) + 
                           (GetZ()-oldZ)*(GetZ()-oldZ));
  if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
#endif
  Double_t d = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0]) + 
                           (end[1]-start[1])*(end[1]-start[1]) + 
                           (end[2]-start[2])*(end[2]-start[2]));
  if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);

  /* get material budget from tracker */
  AliTracker::MeanMaterialBudget(start, end, mparam);
  Double_t xTimesRho = mparam[4]*mparam[0];
  if (oldX < xk) { // CZ
    xTimesRho = -xTimesRho; // it should be negative in case of outward
                            // propagation (--> energy decreases)
  } // CZ
  Double_t xOverX0   = mparam[1];

  /* correct for mean material */
  if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,xTimesRho,GetMass())) return kFALSE;


#if 0 /*** OLD ***/
  if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass())) 
     return kFALSE;
#endif

  /*
  //Energy losses************************
  if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;}

  Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
  //
  // suspicious part - think about it ?
  Double_t kinE =  TMath::Sqrt(p2);
  if (dE>0.8*kinE) dE = 0.8*kinE;  //      
  if (dE<0)        dE = 0.0;       // not valid region for Bethe bloch 
  */

  return kTRUE;            
}     

//_____________________________________________________________________________
Bool_t AliTOFtrack::PropagateToInnerTOF()
{
  // Propagates a track of particle with mass=pm to a reference plane 
  // defined by x=xk through media of density=rho and radiationLength=x0

  //const Double_t kAlphac  = TMath::Pi()/9.0; // 20 degree
  const Double_t kAlphac  = AliTOFGeometry::GetAlpha(); // 20 degree
  const Double_t kTalphac = TMath::Tan(kAlphac*0.5);

  //const Double_t kStepSize = 0.1; // [cm] Step size
  const Double_t kStepSize = 0.5; // [cm] Step size

  Double_t x = GetX();
  //Double_t bz = GetBz();

  //Double_t xyz0[3];
  //Double_t xyz1[3];
  //Double_t y;
  //Double_t z;

  Int_t nsteps = (Int_t)((AliTOFGeometry::Rmin()-x)/kStepSize);
  for (Int_t istep=0; istep<nsteps; istep++){

    // Critical alpha  - cross sector indication

    Double_t dir = (GetX() > AliTOFGeometry::Rmin()) ? -1.0 : 1.0;

    x = GetX()+dir*kStepSize;
    if ( x<GetX() && GetX()<AliTOFGeometry::Rmin()) {
      AliDebug(1,Form("Track doesn't reach rho=%f",AliTOFGeometry::Rmin()));
      return kFALSE;
    }

    //GetXYZ(xyz0);
    //bz = GetBz();
    //GetXYZAt(x,bz,xyz1);
    //AliExternalTrackParam::GetYAt(x,bz,y);
    //AliExternalTrackParam::GetZAt(x,bz,z);
 
    PropagateTo(x,0.,0.); /* passing 0.,0. as arguments since now
			      this method queries TGeo for material budget
			   */
    
    if (GetY() >  GetX()*kTalphac)
      Rotate(kAlphac);
    else if (GetY() < -GetX()*kTalphac)
      Rotate(-kAlphac);

  }

  //Bool_t check = PropagateTo(AliTOFGeometry::RinTOF());
  Bool_t check = PropagateTo(AliTOFGeometry::RinTOF(),0.,0.); /* passing 0.,0. as arguments since now
								 this method queries TGeo for material budget
							      */

  if (!check) return kFALSE;

  if (GetY() >  GetX()*kTalphac)
    Rotate(kAlphac);
  else if (GetY() < -GetX()*kTalphac)
    Rotate(-kAlphac);

  return kTRUE;
  
}     

//_____________________________________________________________________________
Bool_t AliTOFtrack::PropagateToInnerTOFold()
{
  // Propagates a track of particle with mass=pm to a reference plane 
  // defined by x=xk through media of density=rho and radiationLength=x0


  Double_t ymax=AliTOFGeometry::RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
  Bool_t skip = kFALSE;
  Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip);
  if (skip) {
    return kFALSE;
  }
  if (y > ymax) {
    if (!Rotate(AliTOFGeometry::GetAlpha())) {
      return kFALSE;
    }
  } else if (y <-ymax) {
    if (!Rotate(-AliTOFGeometry::GetAlpha())) {
      return kFALSE;
    }
  }
  
  Double_t x = GetX();
  Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps
  for (Int_t istep=0;istep<nsteps;istep++){
    Float_t xp = x+istep*0.5; 
    //    GetPropagationParameters(param);  
    PropagateTo(xp,0.,0.); /* passing 0.,0. as arguments since now
			      this method queries TGeo for material budget
			   */
    
  }
  
  if(!PropagateTo(AliTOFGeometry::RinTOF()))return 0;
  
  return kTRUE;
  
}     

//_________________________________________________________________________
Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const {
  //
  // Estimate the chi2 of the space point "c" with its cov. matrix elements
  //

  Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
  Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
  Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
  return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
}
//_________________________________________________________________________
Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) {
  //
  // Propagates a track to the plane containing cluster 'c'
  //
  Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
  Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
  Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
  Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
  Double_t bz=GetBz();
  if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
  if (IsStartedTimeIntegral()) {
    Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
			     (GetY()-oldY)*(GetY()-oldY) +
			     (GetZ()-oldZ)*(GetZ()-oldZ));
    if (GetX()<oldX) d=-d;
    AddTimeStep(d);

  }

  if (GetY() >  GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha()))
    Rotate(AliTOFGeometry::GetAlpha());
  else if (GetY() < -GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha()))
    Rotate(-AliTOFGeometry::GetAlpha());

  return kTRUE;
}
//_________________________________________________________________________
Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {     
//-----------------------------------------------------------------
// This function calculates the Y-coordinate of a track at the plane x=xk.
// Needed for matching with the TOF (I.Belikov)
//-----------------------------------------------------------------
     Double_t y=0.;
     skip=(!GetYAt(xk,GetBz(),y));
     return y;
}

//_____________________________________________________________________________
Int_t AliTOFtrack::Compare(const TObject *o) const {
  //-----------------------------------------------------------------
  // This function compares tracks according to the their curvature
  //-----------------------------------------------------------------
  AliTOFtrack *t=(AliTOFtrack*)o;
  Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
  Double_t c =GetSigmaY2()*GetSigmaZ2();
  if (c>co) return 1;
  else if (c<co) return -1;
  return 0;
}


//_____________________________________________________________________________
void AliTOFtrack::GetPropagationParameters(Double_t *param) {

 //Get average medium density, x0 while propagating the track

  //For TRD holes description
  /*
  Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
  Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;

  Double_t zmin = -55.;
  Double_t zmax =  55.;
  */

  // Detector inner/outer radii
  Double_t rTPC    = 261.53;
  Double_t rTPCTRD = 294.5;
  Double_t rTRD    = 369.1;

  // Medium parameters
  Double_t x0TPC = 40.;
  Double_t rhoTPC =0.06124;

  Double_t x0Air = 36.66;
  Double_t rhoAir =1.2931e-3;

  Double_t x0TRD = 171.7;
  Double_t rhoTRD =0.33;

  //  Int_t isec = GetSector();
  Double_t r[3]; GetXYZ(r);
  //  Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]);

  /*
  if(holes){
    if (isec == 0 || isec == 1 || isec == 2 ) {
      if( thetatr>=thetamin && thetatr<=thetamax){ 
	x0TRD= x0Air;
	rhoTRD = rhoAir;
      }
    }
    if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) {
      if( r[2]>=zmin && r[2]<=zmax){ 
	x0TRD= x0Air;
	rhoTRD = rhoAir;
      }
    }
  }
  */
  if(GetX() <= rTPC)
    {param[0]=x0TPC;param[1]=rhoTPC;}
  else if(GetX() > rTPC &&  GetX() < rTPCTRD)
    {param[0]=x0Air;param[1]=rhoAir;}
  else if(GetX() >= rTPCTRD &&  GetX() < rTRD)
    {param[0]=x0TRD;param[1]=rhoTRD;}
  else if(GetX() >= rTRD )
    {param[0]=x0Air;param[1]=rhoAir;}
}
Commit	Line	Data
	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	/* $Id$ */
	17
	18	/////////////////////////////////////////////////////////////////////////////
	19	// //
	20	// AliTOFtrack class //
	21	// //
	22	// Authors: Bologna-CERN-ITEP-Salerno Group //
	23	// //
	24	// Description: class for handling ESD extracted tracks for TOF matching. //
	25	// //
	26	/////////////////////////////////////////////////////////////////////////////
	27
	28	#include "AliESDtrack.h"
	29	#include "AliTracker.h"
	30
	31	#include "AliTOFGeometry.h"
	32	#include "AliTOFtrack.h"
	33
	34	ClassImp(AliTOFtrack)
	35
	36	//_____________________________________________________________________________
	37	AliTOFtrack::AliTOFtrack() :
	38	AliKalmanTrack(),
	39	fSeedInd(-1),
	40	fSeedLab(-1)
	41	{
	42	//
	43	// Default constructor.
	44	//
	45	}
	46
	47	//_____________________________________________________________________________
	48	AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) :
	49	AliKalmanTrack(t),
	50	fSeedInd(t.fSeedInd),
	51	fSeedLab(t.fSeedLab)
	52	{
	53	//
	54	// Copy constructor.
	55	//
	56	}
	57
	58	//_____________________________________________________________________________
	59	AliTOFtrack::AliTOFtrack(const AliESDtrack& t) :
	60	AliKalmanTrack(),
	61	fSeedInd(-1),
	62	fSeedLab(-1)
	63	{
	64	//
	65	// Constructor from AliESDtrack
	66	//
	67	SetLabel(t.GetLabel());
	68	SetChi2(0.);
	69	SetMass(t.GetMass());
	70
	71	Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
	72
	73	if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
	74	StartTimeIntegral();
	75	Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
	76	SetIntegratedLength(t.GetIntegratedLength());
	77
	78	}
	79
	80	//____________________________________________________________________________
	81	AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/source/)
	82	{
	83	// ass. op.
	84
	85	return *this;
	86
	87	}
	88
	89	//_____________________________________________________________________________
	90	Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t /x0/,Double_t /rho/)
	91	{
	92	//
	93	// Propagates a track of particle with mass=pm to a reference plane
	94	// defined by x=xk through media of density=rho and radiationLength=x0
	95	//
	96
	97	if (xk == GetX()) return kTRUE;
	98
	99	Double_t oldX=GetX();//, oldY=GetY(), oldZ=GetZ();
	100	Double_t start[3], end[3], mparam[7];
	101
	102	/* get start position */
	103	GetXYZ(start);
	104
	105	/* propagate the track */
	106	Double_t b[3];GetBxByBz(b);
	107	if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
	108	// OLD used code
	109	//Double_t bz=GetBz();
	110	//if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
	111
	112	/* get end position */
	113	GetXYZ(end);
	114
	115	/* add time step to integral */
	116	#if 0 /* OLD */
	117	Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
	118	(GetY()-oldY)*(GetY()-oldY) +
	119	(GetZ()-oldZ)*(GetZ()-oldZ));
	120	if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
	121	#endif
	122	Double_t d = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0]) +
	123	(end[1]-start[1])*(end[1]-start[1]) +
	124	(end[2]-start[2])*(end[2]-start[2]));
	125	if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
	126
	127	/* get material budget from tracker */
	128	AliTracker::MeanMaterialBudget(start, end, mparam);
	129	Double_t xTimesRho = mparam[4]*mparam[0];
	130	if (oldX < xk) { // CZ
	131	xTimesRho = -xTimesRho; // it should be negative in case of outward
	132	// propagation (--> energy decreases)
	133	} // CZ
	134	Double_t xOverX0 = mparam[1];
	135
	136	/* correct for mean material */
	137	if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,xTimesRho,GetMass())) return kFALSE;
	138
	139
	140	#if 0 /* OLD */
	141	if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass()))
	142	return kFALSE;
	143	#endif
	144
	145	/*
	146	//Energy losses************************
	147	if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;}
	148
	149	Double_t dE=0.153e-3/beta2(log(5940beta2/(1-beta2+1e-10)) - beta2)drho;
	150	//
	151	// suspicious part - think about it ?
	152	Double_t kinE = TMath::Sqrt(p2);
	153	if (dE>0.8kinE) dE = 0.8kinE; //
	154	if (dE<0) dE = 0.0; // not valid region for Bethe bloch
	155	*/
	156
	157	return kTRUE;
	158	}
	159
	160	//_____________________________________________________________________________
	161	Bool_t AliTOFtrack::PropagateToInnerTOF()
	162	{
	163	// Propagates a track of particle with mass=pm to a reference plane
	164	// defined by x=xk through media of density=rho and radiationLength=x0
	165
	166	//const Double_t kAlphac = TMath::Pi()/9.0; // 20 degree
	167	const Double_t kAlphac = AliTOFGeometry::GetAlpha(); // 20 degree
	168	const Double_t kTalphac = TMath::Tan(kAlphac*0.5);
	169
	170	//const Double_t kStepSize = 0.1; // [cm] Step size
	171	const Double_t kStepSize = 0.5; // [cm] Step size
	172
	173	Double_t x = GetX();
	174	//Double_t bz = GetBz();
	175
	176	//Double_t xyz0[3];
	177	//Double_t xyz1[3];
	178	//Double_t y;
	179	//Double_t z;
	180
	181	Int_t nsteps = (Int_t)((AliTOFGeometry::Rmin()-x)/kStepSize);
	182	for (Int_t istep=0; istep<nsteps; istep++){
	183
	184	// Critical alpha - cross sector indication
	185
	186	Double_t dir = (GetX() > AliTOFGeometry::Rmin()) ? -1.0 : 1.0;
	187
	188	x = GetX()+dir*kStepSize;
	189	if ( x<GetX() && GetX()<AliTOFGeometry::Rmin()) {
	190	AliDebug(1,Form("Track doesn't reach rho=%f",AliTOFGeometry::Rmin()));
	191	return kFALSE;
	192	}
	193
	194	//GetXYZ(xyz0);
	195	//bz = GetBz();
	196	//GetXYZAt(x,bz,xyz1);
	197	//AliExternalTrackParam::GetYAt(x,bz,y);
	198	//AliExternalTrackParam::GetZAt(x,bz,z);
	199
	200	PropagateTo(x,0.,0.); /* passing 0.,0. as arguments since now
	201	this method queries TGeo for material budget
	202	*/
	203
	204	if (GetY() > GetX()*kTalphac)
	205	Rotate(kAlphac);
	206	else if (GetY() < -GetX()*kTalphac)
	207	Rotate(-kAlphac);
	208
	209	}
	210
	211	//Bool_t check = PropagateTo(AliTOFGeometry::RinTOF());
	212	Bool_t check = PropagateTo(AliTOFGeometry::RinTOF(),0.,0.); /* passing 0.,0. as arguments since now
	213	this method queries TGeo for material budget
	214	*/
	215
	216	if (!check) return kFALSE;
	217
	218	if (GetY() > GetX()*kTalphac)
	219	Rotate(kAlphac);
	220	else if (GetY() < -GetX()*kTalphac)
	221	Rotate(-kAlphac);
	222
	223	return kTRUE;
	224
	225	}
	226
	227	//_____________________________________________________________________________
	228	Bool_t AliTOFtrack::PropagateToInnerTOFold()
	229	{
	230	// Propagates a track of particle with mass=pm to a reference plane
	231	// defined by x=xk through media of density=rho and radiationLength=x0
	232
	233
	234	Double_t ymax=AliTOFGeometry::RinTOF()TMath::Tan(0.5AliTOFGeometry::GetAlpha());
	235	Bool_t skip = kFALSE;
	236	Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip);
	237	if (skip) {
	238	return kFALSE;
	239	}
	240	if (y > ymax) {
	241	if (!Rotate(AliTOFGeometry::GetAlpha())) {
	242	return kFALSE;
	243	}
	244	} else if (y <-ymax) {
	245	if (!Rotate(-AliTOFGeometry::GetAlpha())) {
	246	return kFALSE;
	247	}
	248	}
	249
	250	Double_t x = GetX();
	251	Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps
	252	for (Int_t istep=0;istep<nsteps;istep++){
	253	Float_t xp = x+istep*0.5;
	254	// GetPropagationParameters(param);
	255	PropagateTo(xp,0.,0.); /* passing 0.,0. as arguments since now
	256	this method queries TGeo for material budget
	257	*/
	258
	259	}
	260
	261	if(!PropagateTo(AliTOFGeometry::RinTOF()))return 0;
	262
	263	return kTRUE;
	264
	265	}
	266
	267	//_________________________________________________________________________
	268	Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const {
	269	//
	270	// Estimate the chi2 of the space point "c" with its cov. matrix elements
	271	//
	272
	273	Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
	274	Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
	275	Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
	276	return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
	277	}
	278	//_________________________________________________________________________
	279	Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) {
	280	//
	281	// Propagates a track to the plane containing cluster 'c'
	282	//
	283	Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
	284	Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
	285	Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
	286	Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
	287	Double_t bz=GetBz();
	288	if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
	289	if (IsStartedTimeIntegral()) {
	290	Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
	291	(GetY()-oldY)*(GetY()-oldY) +
	292	(GetZ()-oldZ)*(GetZ()-oldZ));
	293	if (GetX()<oldX) d=-d;
	294	AddTimeStep(d);
	295
	296	}
	297
	298	if (GetY() > GetX()TMath::Tan(0.5AliTOFGeometry::GetAlpha()))
	299	Rotate(AliTOFGeometry::GetAlpha());
	300	else if (GetY() < -GetX()TMath::Tan(0.5AliTOFGeometry::GetAlpha()))
	301	Rotate(-AliTOFGeometry::GetAlpha());
	302
	303	return kTRUE;
	304	}
	305	//_________________________________________________________________________
	306	Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {
	307	//-----------------------------------------------------------------
	308	// This function calculates the Y-coordinate of a track at the plane x=xk.
	309	// Needed for matching with the TOF (I.Belikov)
	310	//-----------------------------------------------------------------
	311	Double_t y=0.;
	312	skip=(!GetYAt(xk,GetBz(),y));
	313	return y;
	314	}
	315
	316	//_____________________________________________________________________________
	317	Int_t AliTOFtrack::Compare(const TObject *o) const {
	318	//-----------------------------------------------------------------
	319	// This function compares tracks according to the their curvature
	320	//-----------------------------------------------------------------
	321	AliTOFtrack t=(AliTOFtrack)o;
	322	Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
	323	Double_t c =GetSigmaY2()*GetSigmaZ2();
	324	if (c>co) return 1;
	325	else if (c<co) return -1;
	326	return 0;
	327	}
	328
	329
	330	//_____________________________________________________________________________
	331	void AliTOFtrack::GetPropagationParameters(Double_t *param) {
	332
	333	//Get average medium density, x0 while propagating the track
	334
	335	//For TRD holes description
	336	/*
	337	Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
	338	Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;
	339
	340	Double_t zmin = -55.;
	341	Double_t zmax = 55.;
	342	*/
	343
	344	// Detector inner/outer radii
	345	Double_t rTPC = 261.53;
	346	Double_t rTPCTRD = 294.5;
	347	Double_t rTRD = 369.1;
	348
	349	// Medium parameters
	350	Double_t x0TPC = 40.;
	351	Double_t rhoTPC =0.06124;
	352
	353	Double_t x0Air = 36.66;
	354	Double_t rhoAir =1.2931e-3;
	355
	356	Double_t x0TRD = 171.7;
	357	Double_t rhoTRD =0.33;
	358
	359	// Int_t isec = GetSector();
	360	Double_t r[3]; GetXYZ(r);
	361	// Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]r[0]+r[1]r[1]),r[2]);
	362
	363	/*
	364	if(holes){
	365	if (isec == 0 \|\| isec == 1 \|\| isec == 2 ) {
	366	if( thetatr>=thetamin && thetatr<=thetamax){
	367	x0TRD= x0Air;
	368	rhoTRD = rhoAir;
	369	}
	370	}
	371	if (isec == 11 \|\| isec == 12 \|\| isec == 13 \|\| isec == 14 \|\| isec == 15 ) {
	372	if( r[2]>=zmin && r[2]<=zmax){
	373	x0TRD= x0Air;
	374	rhoTRD = rhoAir;
	375	}
	376	}
	377	}
	378	*/
	379	if(GetX() <= rTPC)
	380	{param[0]=x0TPC;param[1]=rhoTPC;}
	381	else if(GetX() > rTPC && GetX() < rTPCTRD)
	382	{param[0]=x0Air;param[1]=rhoAir;}
	383	else if(GetX() >= rTPCTRD && GetX() < rTRD)
	384	{param[0]=x0TRD;param[1]=rhoTRD;}
	385	else if(GetX() >= rTRD )
	386	{param[0]=x0Air;param[1]=rhoAir;}
	387	}