* provided "as is" without express or implied warranty. *
**************************************************************************/
+/* $Id$ */
+
//-----------------------------------------------------------------
// Implementation of the TPC track class
-//
-// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
+// This class is used by the AliTPCtracker class
+// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
//-----------------------------------------------------------------
-#include <iostream.h>
+#include <Riostream.h>
#include "AliTPCtrack.h"
-#include "AliTPCcluster.h"
-#include "AliTPCClustersRow.h"
-#include "AliTPCClustersArray.h"
+#include "AliCluster.h"
+#include "AliESDtrack.h"
ClassImp(AliTPCtrack)
//_________________________________________________________________________
+AliTPCtrack::AliTPCtrack(): AliKalmanTrack()
+{
+ //-------------------------------------------------
+ // default constructor
+ //-------------------------------------------------
+ fX = fP0 = fP1 = fP2 = fP3 = fP3 = fP4 = 0.0;
+ fAlpha = fdEdx = 0.0;
+ fNumber = 0; // [SR, 01.04.2003]
+ for (Int_t i=0; i<3;i++) fKinkIndexes[i]=0;
+}
+
+//_________________________________________________________________________
+
+
+
AliTPCtrack::AliTPCtrack(UInt_t index, const Double_t xx[5],
const Double_t cc[15], Double_t xref, Double_t alpha) : AliKalmanTrack() {
//-----------------------------------------------------------------
fP0=xx[0]; fP1=xx[1]; fP2=xx[2]; fP3=xx[3]; fP4=xx[4];
+ SaveLocalConvConst();
+
fC00=cc[0];
fC10=cc[1]; fC11=cc[2];
fC20=cc[3]; fC21=cc[4]; fC22=cc[5];
fIndex[0]=index;
SetNumberOfClusters(1);
-
+ //
+ //MI
+ fSdEdx = 0;
+ fNFoundable = 0;
+ fBConstrain = 0;
+ fLastPoint = 0;
+ fFirstPoint = 0;
+ fRemoval = 0;
+ fTrackType = 0;
+ fLab2 = 0;
+ for (Int_t i=0; i<3;i++) fKinkIndexes[i]=0;
+ for (Int_t i=0; i<3;i++) fV0Indexes[i]=0;
}
//_____________________________________________________________________________
-AliTPCtrack::AliTPCtrack(const AliKalmanTrack& t,Double_t alpha) {
+AliTPCtrack::AliTPCtrack(const AliESDtrack& t) : AliKalmanTrack() {
//-----------------------------------------------------------------
- // Conversion AliKalmanTrack -> AliTPCtrack.
+ // Conversion AliESDtrack -> AliTPCtrack.
//-----------------------------------------------------------------
+ SetNumberOfClusters(t.GetTPCclusters(fIndex));
SetLabel(t.GetLabel());
- SetChi2(0.);
SetMass(t.GetMass());
- SetNumberOfClusters(0);
- //SetConvConst(t.GetConvConst());
+ for (Int_t i=0; i<3;i++) fKinkIndexes[i]=t.GetKinkIndex(i);
+ for (Int_t i=0; i<3;i++) fV0Indexes[i]=t.GetV0Index(i);
- fdEdx = 0.;
- fAlpha = alpha;
+ fdEdx = t.GetTPCsignal();
+ fAlpha = t.GetAlpha();
if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
//Conversion of the track parameters
Double_t x,p[5]; t.GetExternalParameters(x,p);
- fX=x; x=GetConvConst();
- fP0=p[0];
- fP1=p[1];
- fP3=p[3];
- fP4=p[4]/x;
+ Double_t c[15]; t.GetExternalCovariance(c);
+
+ fX=x;
+ fP0=p[0];
+ fP1=p[1]; SaveLocalConvConst();
+ fP3=p[3]; x=GetLocalConvConst();
+ fP4=p[4]/x;
fP2=fP4*fX - p[2];
//Conversion of the covariance matrix
- Double_t c[15]; t.GetExternalCovariance(c);
c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
Double_t c32=fX*c[13] - c[8];
Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
-
+
fC00=c[0 ];
fC10=c[1 ]; fC11=c[2 ];
fC20=c20; fC21=c21; fC22=c22;
fC30=c[6 ]; fC31=c[7 ]; fC32=c32; fC33=c[9 ];
fC40=c[10]; fC41=c[11]; fC42=c42; fC43=c[13]; fC44=c[14];
+ if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
+ StartTimeIntegral();
+ Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
+ SetIntegratedLength(t.GetIntegratedLength());
+ //
+ //MI
+ fSdEdx = 0;
+ fNFoundable = 0;
+ fBConstrain = 0;
+ fLastPoint = 0;
+ fFirstPoint = 0;
+ fRemoval = 0;
+ fTrackType = 0;
+ fLab2 = 0;
+ // SetFakeRatio(t.GetTPCFakeRatio());
}
//_____________________________________________________________________________
fC30=t.fC30; fC31=t.fC31; fC32=t.fC32; fC33=t.fC33;
fC40=t.fC40; fC41=t.fC41; fC42=t.fC42; fC43=t.fC43; fC44=t.fC44;
- Int_t n=GetNumberOfClusters();
- for (Int_t i=0; i<n; i++) fIndex[i]=t.fIndex[i];
+ //Int_t n=GetNumberOfClusters();
+ for (Int_t i=0; i<kMaxRow; i++) fIndex[i]=t.fIndex[i];
+ //
+ //MI
+ fSdEdx = t.fSdEdx;
+ fNFoundable = t.fNFoundable;
+ fBConstrain = t.fBConstrain;
+ fLastPoint = t.fLastPoint;
+ fFirstPoint = t.fFirstPoint;
+ fRemoval = t.fRemoval ;
+ fTrackType = t.fTrackType;
+ fLab2 = t.fLab2;
+ for (Int_t i=0; i<3;i++) fKinkIndexes[i]=t.fKinkIndexes[i];
+ for (Int_t i=0; i<3;i++) fV0Indexes[i]=t.fV0Indexes[i];
}
//_____________________________________________________________________________
//_____________________________________________________________________________
void AliTPCtrack::GetExternalCovariance(Double_t cc[15]) const {
- //-------------------------------------------------------------------------
+ //-------------------------------------------------------------------------
// This function returns an external representation of the covriance matrix.
// (See comments in AliTPCtrack.h about external track representation)
//-------------------------------------------------------------------------
- Double_t a=GetConvConst();
+ Double_t a=GetLocalConvConst();
Double_t c22=fX*fX*fC44-2*fX*fC42+fC22;
Double_t c32=fX*fC43-fC32;
return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
}
+Double_t AliTPCtrack::GetYat(Double_t xk) const {
+//-----------------------------------------------------------------
+// This function calculates the Y-coordinate of a track at the plane x=xk.
+//-----------------------------------------------------------------
+ Double_t c1=fP4*fX - fP2, r1=TMath::Sqrt(1.- c1*c1);
+ Double_t c2=fP4*xk - fP2;
+ if (c2*c2>0.99999) {
+ Int_t n=GetNumberOfClusters();
+ if (n>4) cerr<<n<<"AliTPCtrack::GetYat: can't evaluate the y-coord !\n";
+ return 1e10;
+ }
+ Double_t r2=TMath::Sqrt(1.- c2*c2);
+ return fP0 + (xk-fX)*(c1+c2)/(r1+r2);
+}
+
//_____________________________________________________________________________
-Int_t AliTPCtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) {
+Int_t AliTPCtrack::PropagateTo(Double_t xk,Double_t /*x0*/,Double_t rho) {
//-----------------------------------------------------------------
// This function propagates a track to a reference plane x=xk.
//-----------------------------------------------------------------
- if (TMath::Abs(fP4*xk - fP2) >= 0.99999) {
- Int_t n=GetNumberOfClusters();
- if (n>4) cerr<<n<<" AliTPCtrack warning: Propagation failed !\n";
+ if (TMath::Abs(fP4*xk - fP2) >= 0.9) {
+ // Int_t n=GetNumberOfClusters();
+ //if (n>4) cerr<<n<<" AliTPCtrack warning: Propagation failed !\n";
return 0;
}
+ Double_t lcc=GetLocalConvConst();
+
+ // old position for time [SR, GSI 17.02.2003]
+ Double_t oldX = fX;
+ Double_t oldY = fP0;
+ Double_t oldZ = fP1;
+ //
Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fP0, z1=fP1;
Double_t c1=fP4*x1 - fP2, r1=sqrt(1.- c1*c1);
fX=x2;
- //Multiple scattering******************
+ //Change of the magnetic field *************
+ SaveLocalConvConst();
+ cc=fP4;
+ fP4*=lcc/GetLocalConvConst();
+ fP2+=fX*(fP4-cc);
+
+ //Multiple scattering ******************
Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fP0)*(y1-fP0)+(z1-fP1)*(z1-fP1));
Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
Double_t beta2=p2/(p2 + GetMass()*GetMass());
+ beta2 = TMath::Min(beta2,0.99999999999);
//Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
Double_t theta2=1.0259e-6*10*10/20/(beta2*p2)*d*rho;
Double_t ey=fP4*fX - fP2, ez=fP3;
Double_t xz=fP4*ez, zz1=ez*ez+1, xy=fP2+ey;
-
+
fC22 += (2*ey*ez*ez*fP2+1-ey*ey+ez*ez+fP2*fP2*ez*ez)*theta2;
fC32 += ez*zz1*xy*theta2;
fC33 += zz1*zz1*theta2;
fC42 += xz*ez*xy*theta2;
fC43 += xz*zz1*theta2;
fC44 += xz*xz*theta2;
-
- //Energy losses************************
+ /*
+ //
+ //MI coeficints
+ Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2;
+ Double_t dc32 = (xz*fX*zz1)*theta2;
+ Double_t dc33 = (zz1*zz1)*theta2;
+ Double_t dc42 = (xz*fX*xz)*theta2;
+ Double_t dc43 = (zz1*xz)*theta2;
+ Double_t dc44 = (xz*xz)*theta2;
+ fC22 += dc22;
+ fC32 += dc32;
+ fC33 += dc33;
+ fC42 += dc42;
+ fC43 += dc43;
+ fC44 += dc44;
+ */
+ //Energy losses ************************
Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho;
if (x1 < x2) dE=-dE;
cc=fP4;
+
+ //Double_t E = sqrt(p2+GetMass()*GetMass());
+ //Double_t mifac = TMath::Sqrt(1.+dE*dE/p2+2*E*dE/p2)-1;
+ //Double_t belfac = E*dE/p2;
+ //
fP4*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE);
fP2+=fX*(fP4-cc);
+ // Integrated Time [SR, GSI, 17.02.2003]
+ if (x1 < x2)
+ if (IsStartedTimeIntegral()) {
+ Double_t l2 = (fX-oldX)*(fX-oldX)+(fP0-oldY)*(fP0-oldY)+(fP1-oldZ)*(fP1-oldZ);
+ AddTimeStep(TMath::Sqrt(l2));
+ }
+ //
+
return 1;
}
Double_t dy=c->GetY() - fP0, dz=c->GetZ() - fP1;
Double_t cur=fP4 + k40*dy + k41*dz, eta=fP2 + k20*dy + k21*dz;
- if (TMath::Abs(cur*fX-eta) >= 0.99999) {
- Int_t n=GetNumberOfClusters();
- if (n>4) cerr<<n<<" AliTPCtrack warning: Filtering failed !\n";
+ if (TMath::Abs(cur*fX-eta) >= 0.9) {
+ // Int_t n=GetNumberOfClusters();
+ //if (n>4) cerr<<n<<" AliTPCtrack warning: Filtering failed !\n";
return 0;
}
fC40=0.; fC41=0.; fC42=0.; fC43=0.; fC44*=10.;
}
+
+////////////////////////////////////////////////////////////////////////
+Double_t AliTPCtrack::Phi() const {
+//
+//
+//
+ Double_t phi = TMath::ASin(GetSnp()) + fAlpha;
+ if (phi<0) phi+=2*TMath::Pi();
+ if (phi>=2*TMath::Pi()) phi-=2*TMath::Pi();
+ return phi;
+}
+////////////////////////////////////////////////////////////////////////
+
+
+
+////////////////////////////////////////////////////////////////////////
+// MI ADDITION
+
+Float_t AliTPCtrack::Density(Int_t row0, Int_t row1)
+{
+ //
+ // calculate cluster density
+ Int_t good = 0;
+ Int_t found = 0;
+ //if (row0<fFirstPoint) row0 = fFirstPoint;
+ if (row1>fLastPoint) row1 = fLastPoint;
+
+
+ for (Int_t i=row0;i<=row1;i++){
+ // Int_t index = fClusterIndex[i];
+ Int_t index = fIndex[i];
+ if (index!=-1) good++;
+ if (index>0) found++;
+ }
+ Float_t density=0;
+ if (good>0) density = Float_t(found)/Float_t(good);
+ return density;
+}
+
+
+Float_t AliTPCtrack::Density2(Int_t row0, Int_t row1)
+{
+ //
+ // calculate cluster density
+ Int_t good = 0;
+ Int_t found = 0;
+ //
+ for (Int_t i=row0;i<=row1;i++){
+ Int_t index = fIndex[i];
+ if (index!=-1) good++;
+ if (index>0) found++;
+ }
+ Float_t density=0;
+ if (good>0) density = Float_t(found)/Float_t(good);
+ return density;
+}
+
+
+Double_t AliTPCtrack::GetZat0() const
+{
+ //
+ // return virtual z - supposing that x = 0
+ if (TMath::Abs(fP2)>1) return 0;
+ if (TMath::Abs(fX*fP4-fP2)>1) return 0;
+ Double_t vz = fP1+fP3/fP4*(asin(-fP2)-asin(fX*fP4-fP2));
+ return vz;
+}
+
+
+Double_t AliTPCtrack::GetD(Double_t x, Double_t y) const {
+ //------------------------------------------------------------------
+ // This function calculates the transverse impact parameter
+ // with respect to a point with global coordinates (x,y)
+ //------------------------------------------------------------------
+ //Double_t xt=fX, yt=fP0;
+
+ Double_t sn=TMath::Sin(fAlpha), cs=TMath::Cos(fAlpha);
+ Double_t a = x*cs + y*sn;
+ y = -x*sn + y*cs; x=a;
+ //
+ Double_t r = TMath::Abs(1/fP4);
+ Double_t x0 = TMath::Abs(fP2*r);
+ Double_t y0 = fP0;
+ y0= fP0+TMath::Sqrt(1-(fP4*fX-fP2)*(fP4*fX-fP2))/fP4;
+
+ Double_t delta = TMath::Sqrt((x-x0)*(x-x0)+(y-y0)*(y-y0));
+ // Double_t delta = TMath::Sqrt(TMath::Abs(x*x-2*x0*x+x0*x0+ y*y-2*y*y0+y0*y0));
+ delta -= TMath::Abs(r);
+ return delta;
+}
+
+//
+//
+
+void AliTPCtrack::UpdatePoints()
+{
+ //--------------------------------------------------
+ //calculates first ,amx dens and last points
+ //--------------------------------------------------
+ Float_t density[160];
+ for (Int_t i=0;i<160;i++) density[i]=-1.;
+ fPoints[0]= 160;
+ fPoints[1] = -1;
+ //
+ Int_t ngood=0;
+ Int_t undeff=0;
+ Int_t nall =0;
+ Int_t range=20;
+ for (Int_t i=0;i<160;i++){
+ Int_t last = i-range;
+ if (nall<range) nall++;
+ if (last>=0){
+ if (fIndex[last]>0&& (fIndex[last]&0x8000)==0) ngood--;
+ if (fIndex[last]==-1) undeff--;
+ }
+ if (fIndex[i]>0&& (fIndex[i]&0x8000)==0) ngood++;
+ if (fIndex[i]==-1) undeff++;
+ if (nall==range &&undeff<range/2) density[i-range/2] = Float_t(ngood)/Float_t(nall-undeff);
+ }
+ Float_t maxdens=0;
+ Int_t indexmax =0;
+ for (Int_t i=0;i<160;i++){
+ if (density[i]<0) continue;
+ if (density[i]>maxdens){
+ maxdens=density[i];
+ indexmax=i;
+ }
+ }
+ //
+ //max dens point
+ fPoints[3] = maxdens;
+ fPoints[1] = indexmax;
+ //
+ // last point
+ for (Int_t i=indexmax;i<160;i++){
+ if (density[i]<0) continue;
+ if (density[i]<maxdens/2.) {
+ break;
+ }
+ fPoints[2]=i;
+ }
+ //
+ // first point
+ for (Int_t i=indexmax;i>0;i--){
+ if (density[i]<0) continue;
+ if (density[i]<maxdens/2.) {
+ break;
+ }
+ fPoints[0]=i;
+ }
+ //
+}
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