* provided "as is" without express or implied warranty. *
**************************************************************************/
-//-------------------------------------------------------------------------
+///////////////////////////////////////////////////////////////////////////
// Implementation of the ITS track class
//
// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
// dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
-//-------------------------------------------------------------------------
-
-#include <TMatrixD.h>
-
+///////////////////////////////////////////////////////////////////////////
#include <TMath.h>
-#include <Riostream.h>
#include "AliCluster.h"
-#include "AliTPCtrack.h"
+#include "AliTracker.h"
+#include "AliESDtrack.h"
#include "AliITStrackV2.h"
ClassImp(AliITStrackV2)
const Int_t kWARN=5;
//____________________________________________________________________________
-AliITStrackV2::AliITStrackV2(const AliTPCtrack& t) throw (const Char_t *) {
- //------------------------------------------------------------------
- //Conversion TPC track -> ITS track
- //------------------------------------------------------------------
- SetLabel(t.GetLabel());
- SetChi2(0.);
- SetNumberOfClusters(0);
- //SetConvConst(t.GetConvConst());
+AliITStrackV2::AliITStrackV2() : AliKalmanTrack(),
+ fdEdx(0),
+ fESDtrack(0)
+{
+ for(Int_t i=0; i<2*kMaxLayer; i++) fIndex[i]=-1;
+ for(Int_t i=0; i<4; i++) fdEdxSample[i]=0;
+}
- fdEdx = t.GetdEdx();
- SetMass(t.GetMass());
- fAlpha = t.GetAlpha();
- if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
- else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
+//____________________________________________________________________________
+AliITStrackV2::AliITStrackV2(AliESDtrack& t,Bool_t c) throw (const Char_t *) :
+ AliKalmanTrack(),
+ fdEdx(t.GetITSsignal()),
+ fESDtrack(&t)
+{
+ //------------------------------------------------------------------
+ // Conversion ESD track -> ITS track.
+ // If c==kTRUE, create the ITS track out of the constrained params.
+ //------------------------------------------------------------------
+ const AliExternalTrackParam *par=&t;
+ if (c) {
+ par=t.GetConstrainedParam();
+ if (!par) throw "AliITStrackV2: conversion failed !\n";
+ }
+ Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance());
- //Conversion of the track parameters
- Double_t x,p[5]; t.GetExternalParameters(x,p);
- fX=x; x=GetConvConst();
- fP0=p[0];
- fP1=p[1];
- fP2=p[2];
- fP3=p[3];
- fP4=p[4]/x;
+ //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n";
- //Conversion of the covariance matrix
- Double_t c[15]; t.GetExternalCovariance(c);
+ SetLabel(t.GetLabel());
+ SetMass(t.GetMass());
+ SetNumberOfClusters(t.GetITSclusters(fIndex));
- fC00=c[0 ];
- fC10=c[1 ]; fC11=c[2 ];
- fC20=c[3 ]; fC21=c[4 ]; fC22=c[5 ];
- fC30=c[6 ]; fC31=c[7 ]; fC32=c[8 ]; fC33=c[9 ];
- fC40=c[10]/x; fC41=c[11]/x; fC42=c[12]/x; fC43=c[13]/x; fC44=c[14]/x/x;
+ if (t.GetStatus()&AliESDtrack::kTIME) {
+ StartTimeIntegral();
+ Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
+ SetIntegratedLength(t.GetIntegratedLength());
+ }
- if (!Invariant()) throw "AliITStrackV2: conversion failed !\n";
+ for(Int_t i=0; i<4; i++) fdEdxSample[i]=0;
+}
+void AliITStrackV2::UpdateESDtrack(ULong_t flags) const {
+ fESDtrack->UpdateTrackParams(this,flags);
}
//____________________________________________________________________________
-AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) : AliKalmanTrack(t) {
+AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) :
+ AliKalmanTrack(t),
+ fdEdx(t.fdEdx),
+ fESDtrack(t.fESDtrack)
+{
//------------------------------------------------------------------
//Copy constructor
//------------------------------------------------------------------
- fX=t.fX;
- fAlpha=t.fAlpha;
- fdEdx=t.fdEdx;
-
- fP0=t.fP0; fP1=t.fP1; fP2=t.fP2; fP3=t.fP3; fP4=t.fP4;
-
- fC00=t.fC00;
- fC10=t.fC10; fC11=t.fC11;
- fC20=t.fC20; fC21=t.fC21; fC22=t.fC22;
- 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];
- if (i<4) fdEdxSample[i]=t.fdEdxSample[i];
- }
+ Int_t i;
+ for (i=0; i<4; i++) fdEdxSample[i]=t.fdEdxSample[i];
+ for (i=0; i<2*kMaxLayer; i++) fIndex[i]=t.fIndex[i];
}
//_____________________________________________________________________________
return 0;
}
-//_____________________________________________________________________________
-void AliITStrackV2::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();
-
- cc[0 ]=fC00;
- cc[1 ]=fC10; cc[2 ]=fC11;
- cc[3 ]=fC20; cc[4 ]=fC21; cc[5 ]=fC22;
- cc[6 ]=fC30; cc[7 ]=fC31; cc[8 ]=fC32; cc[9 ]=fC33;
- cc[10]=fC40*a; cc[11]=fC41*a; cc[12]=fC42*a; cc[13]=fC43*a; cc[14]=fC44*a*a;
-}
-
//____________________________________________________________________________
-Int_t AliITStrackV2::PropagateToVertex(Double_t d,Double_t x0) {
+Bool_t
+AliITStrackV2::PropagateToVertex(const AliESDVertex *v,Double_t d,Double_t x0)
+{
//------------------------------------------------------------------
//This function propagates a track to the minimal distance from the origin
- //------------------------------------------------------------------
- Double_t xv=fP2*(fX*fP2 - fP0*TMath::Sqrt(1.- fP2*fP2)); //linear approxim.
- PropagateTo(xv,d,x0);
- return 0;
+ //------------------------------------------------------------------
+ Double_t bz=GetBz();
+ if (PropagateToDCA(v,bz,kVeryBig))
+ if (AliExternalTrackParam::CorrectForMaterial(d,x0,GetMass())) return kTRUE;
+ return kFALSE;
}
//____________________________________________________________________________
-Int_t AliITStrackV2::
+Bool_t AliITStrackV2::
GetGlobalXYZat(Double_t xk, Double_t &x, Double_t &y, Double_t &z) const {
//------------------------------------------------------------------
//This function returns a track position in the global system
//------------------------------------------------------------------
- Double_t dx=xk-fX;
- Double_t f1=fP2, f2=f1 + fP4*dx;
- if (TMath::Abs(f2) >= 0.9999) {
- Int_t n=GetNumberOfClusters();
- if (n>kWARN)
- cerr<<n<<" AliITStrackV2::GetGlobalXYZat: Propagation failed !\n";
- return 0;
- }
-
- Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2);
-
- Double_t yk = fP0 + dx*(f1+f2)/(r1+r2);
- Double_t zk = fP1 + dx*(f1+f2)/(f1*r2 + f2*r1)*fP3;
-
- Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha);
- x = xk*cs - yk*sn;
- y = xk*sn + yk*cs;
- z = zk;
-
- return 1;
+ Double_t r[3];
+ Bool_t rc=GetXYZAt(xk, AliTracker::GetBz(), r);
+ x=r[0]; y=r[1]; z=r[2];
+ return rc;
}
//_____________________________________________________________________________
-Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const
-{
+Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const {
//-----------------------------------------------------------------
// This function calculates a predicted chi2 increment.
//-----------------------------------------------------------------
- Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2();
- r00+=fC00; r01+=fC10; r11+=fC11;
-
- Double_t det=r00*r11 - r01*r01;
- if (TMath::Abs(det) < 1.e-30) {
- Int_t n=GetNumberOfClusters();
- if (n>kWARN)
- cerr<<n<<" AliKalmanTrack::GetPredictedChi2: Singular matrix !\n";
- return 1e10;
- }
- Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01;
-
- Double_t dy=c->GetY() - fP0, dz=c->GetZ() - fP1;
-
- return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
-}
-
-//_____________________________________________________________________________
-Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c,Double_t *m,
-Double_t x0) const {
- //-----------------------------------------------------------------
- // This function calculates a chi2 increment with a vertex contraint
- //-----------------------------------------------------------------
- TVectorD x(5); x(0)=fP0; x(1)=fP1; x(2)=fP2; x(3)=fP3; x(4)=fP4;
- TMatrixD C(5,5);
- C(0,0)=fC00;
- C(1,0)=fC10; C(1,1)=fC11;
- C(2,0)=fC20; C(2,1)=fC21; C(2,2)=fC22;
- C(3,0)=fC30; C(3,1)=fC31; C(3,2)=fC32; C(3,3)=fC33;
- C(4,0)=fC40; C(4,1)=fC41; C(4,2)=fC42; C(4,3)=fC43; C(4,4)=fC44;
-
- C(0,1)=C(1,0);
- C(0,2)=C(2,0); C(1,2)=C(2,1);
- C(0,3)=C(3,0); C(1,3)=C(3,1); C(2,3)=C(3,2);
- C(0,4)=C(4,0); C(1,4)=C(4,1); C(2,4)=C(4,2); C(3,4)=C(4,3);
-
- TMatrixD H(4,5); H.UnitMatrix();
- Double_t dy=(c->GetY() - m[0]), dz=(c->GetZ() - m[1]);
-
- Double_t dr=TMath::Sqrt(fX*fX + dy*dy);
- Double_t r =TMath::Sqrt(4/dr/dr - fP4*fP4);
- Double_t sn=0.5*(fP4*fX + dy*r);
- Double_t tg=0.5*fP4*dz/TMath::ASin(0.5*fP4*dr);
- TVectorD mm(4);
- mm(0)=m[0]=c->GetY(); mm(1)=m[1]=c->GetZ(); mm(2)=m[2]=sn; mm(3)=m[3]=tg;
-
- Double_t v22=0.,v33=0.;
- //x0=0.;
- if (x0!=0.) {
- Double_t pp2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
- Double_t beta2=pp2/(pp2 + GetMass()*GetMass());
- x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp()));
- Double_t theta2=14.1*14.1/(beta2*pp2*1e6)*x0;
- v22 = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl());
- v33 = theta2*(1.+ GetTgl()*GetTgl())*(1. + GetTgl()*GetTgl());
- }
- Double_t sy2=c->GetSigmaY2(), sz2=c->GetSigmaZ2();
- v22+=kSigmaYV*kSigmaYV/dr/dr;
- v22+=sy2/dr/dr;
- Double_t v20=sy2/dr;
-
- v33+=kSigmaZV*kSigmaZV/dr/dr;
- v33+=sz2/dr/dr;
- Double_t v31=sz2/dr;
-
- TMatrixD V(4,4);
- V(0,0)=m[4 ]=sy2; V(0,1)=m[5 ]=0.; V(0,2)=m[6 ]=v20; V(0,3)=m[7 ]=0.;
- V(1,0)=m[8 ]=0.; V(1,1)=m[9 ]=sz2; V(1,2)=m[10]=0.; V(1,3)=m[11]=v31;
- V(2,0)=m[12]=v20; V(2,1)=m[13]=0.; V(2,2)=m[14]=v22; V(2,3)=m[15]=0.;
- V(3,0)=m[16]=0.; V(3,1)=m[17]=v31; V(3,2)=m[18]=0.; V(3,3)=m[19]=v33;
-
- TVectorD res=x; res*=H; res-=mm; //res*=-1;
- TMatrixD tmp(H,TMatrixD::kMult,C);
- TMatrixD R(tmp,TMatrixD::kMult,TMatrixD(TMatrixD::kTransposed,H)); R+=V;
-
- Double_t det=R.Determinant();
- if (TMath::Abs(det) < 1.e-30) {
- Int_t n=GetNumberOfClusters();
- if (n>kWARN)
- cerr<<n<<" AliITStrackV2::GetPredictedChi2: Singular matrix !\n";
- return 1e10;
- }
-
- R.Invert();
-
- TVectorD rs=res;
- res*=R;
- return rs*res;
-}
-
-//____________________________________________________________________________
-Int_t AliITStrackV2::CorrectForMaterial(Double_t d, Double_t x0) {
- //------------------------------------------------------------------
- //This function corrects the track parameters for crossed material
- //------------------------------------------------------------------
- Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
- Double_t beta2=p2/(p2 + GetMass()*GetMass());
- d*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2));
-
- //Multiple scattering******************
- if (d!=0) {
- //Double_t theta2=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(d);
- Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*TMath::Abs(d)*9.36*2.33;
- fC22 += theta2*(1.- fP2*fP2)*(1. + fP3*fP3);
- fC33 += theta2*(1. + fP3*fP3)*(1. + fP3*fP3);
- fC43 += theta2*fP3*fP4*(1. + fP3*fP3);
- fC44 += theta2*fP3*fP4*fP3*fP4;
- }
-
- //Energy losses************************
- if (x0!=0.) {
- d*=x0;
- Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d;
- fP4*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE);
- }
-
- if (!Invariant()) return 0;
-
- return 1;
+ Double_t p[2]={c->GetY(), c->GetZ()};
+ Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()};
+ return AliExternalTrackParam::GetPredictedChi2(p,cov);
}
//____________________________________________________________________________
-Int_t AliITStrackV2::PropagateTo(Double_t xk, Double_t d, Double_t x0) {
+Bool_t AliITStrackV2::PropagateTo(Double_t xk, Double_t d, Double_t x0) {
//------------------------------------------------------------------
//This function propagates a track
//------------------------------------------------------------------
- Double_t x1=fX, x2=xk, dx=x2-x1;
- Double_t f1=fP2, f2=f1 + fP4*dx;
- if (TMath::Abs(f2) >= 0.9999) {
- Int_t n=GetNumberOfClusters();
- if (n>kWARN)
- cerr<<n<<" AliITStrackV2::PropagateTo: Propagation failed !\n";
- return 0;
- }
-
- Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2);
+ Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
- fP0 += dx*(f1+f2)/(r1+r2);
- fP1 += dx*(f1+f2)/(f1*r2 + f2*r1)*fP3;
- fP2 += dx*fP4;
+ Double_t bz=GetBz();
+ if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
+ if (!AliExternalTrackParam::CorrectForMaterial(d,x0,GetMass())) return kFALSE;
+
+ Double_t x=GetX(), y=GetY(), z=GetZ();
+ if (IsStartedTimeIntegral() && x>oldX) {
+ Double_t l2 = (x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ);
+ AddTimeStep(TMath::Sqrt(l2));
+ }
- //f = F - 1
-
- Double_t f02= dx/(r1*r1*r1);
- Double_t f04=0.5*dx*dx/(r1*r1*r1);
- Double_t f12= dx*fP3*f1/(r1*r1*r1);
- Double_t f14=0.5*dx*dx*fP3*f1/(r1*r1*r1);
- Double_t f13= dx/r1;
- Double_t f24= dx;
-
- //b = C*ft
- Double_t b00=f02*fC20 + f04*fC40, b01=f12*fC20 + f14*fC40 + f13*fC30;
- Double_t b02=f24*fC40;
- Double_t b10=f02*fC21 + f04*fC41, b11=f12*fC21 + f14*fC41 + f13*fC31;
- Double_t b12=f24*fC41;
- Double_t b20=f02*fC22 + f04*fC42, b21=f12*fC22 + f14*fC42 + f13*fC32;
- Double_t b22=f24*fC42;
- Double_t b40=f02*fC42 + f04*fC44, b41=f12*fC42 + f14*fC44 + f13*fC43;
- Double_t b42=f24*fC44;
- Double_t b30=f02*fC32 + f04*fC43, b31=f12*fC32 + f14*fC43 + f13*fC33;
- Double_t b32=f24*fC43;
-
- //a = f*b = f*C*ft
- Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a02=f02*b22+f04*b42;
- Double_t a11=f12*b21+f14*b41+f13*b31,a12=f12*b22+f14*b42+f13*b32;
- Double_t a22=f24*b42;
-
- //F*C*Ft = C + (b + bt + a)
- fC00 += b00 + b00 + a00;
- fC10 += b10 + b01 + a01;
- fC20 += b20 + b02 + a02;
- fC30 += b30;
- fC40 += b40;
- fC11 += b11 + b11 + a11;
- fC21 += b21 + b12 + a12;
- fC31 += b31;
- fC41 += b41;
- fC22 += b22 + b22 + a22;
- fC32 += b32;
- fC42 += b42;
-
- fX=x2;
-
- if (!CorrectForMaterial(d,x0)) return 0;
-
- return 1;
+ return kTRUE;
}
//____________________________________________________________________________
-Int_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, UInt_t index) {
+Bool_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, Int_t index)
+{
//------------------------------------------------------------------
//This function updates track parameters
//------------------------------------------------------------------
- Double_t p0=fP0,p1=fP1,p2=fP2,p3=fP3,p4=fP4;
- Double_t c00=fC00;
- Double_t c10=fC10, c11=fC11;
- Double_t c20=fC20, c21=fC21, c22=fC22;
- Double_t c30=fC30, c31=fC31, c32=fC32, c33=fC33;
- Double_t c40=fC40, c41=fC41, c42=fC42, c43=fC43, c44=fC44;
-
-
- Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2();
- r00+=fC00; r01+=fC10; r11+=fC11;
- Double_t det=r00*r11 - r01*r01;
- Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
-
- Double_t k00=fC00*r00+fC10*r01, k01=fC00*r01+fC10*r11;
- Double_t k10=fC10*r00+fC11*r01, k11=fC10*r01+fC11*r11;
- Double_t k20=fC20*r00+fC21*r01, k21=fC20*r01+fC21*r11;
- Double_t k30=fC30*r00+fC31*r01, k31=fC30*r01+fC31*r11;
- Double_t k40=fC40*r00+fC41*r01, k41=fC40*r01+fC41*r11;
-
- Double_t dy=c->GetY() - fP0, dz=c->GetZ() - fP1;
- Double_t sf=fP2 + k20*dy + k21*dz;
-
- fP0 += k00*dy + k01*dz;
- fP1 += k10*dy + k11*dz;
- fP2 = sf;
- fP3 += k30*dy + k31*dz;
- fP4 += k40*dy + k41*dz;
-
- Double_t c01=fC10, c02=fC20, c03=fC30, c04=fC40;
- Double_t c12=fC21, c13=fC31, c14=fC41;
-
- fC00-=k00*fC00+k01*fC10; fC10-=k00*c01+k01*fC11;
- fC20-=k00*c02+k01*c12; fC30-=k00*c03+k01*c13;
- fC40-=k00*c04+k01*c14;
-
- fC11-=k10*c01+k11*fC11;
- fC21-=k10*c02+k11*c12; fC31-=k10*c03+k11*c13;
- fC41-=k10*c04+k11*c14;
-
- fC22-=k20*c02+k21*c12; fC32-=k20*c03+k21*c13;
- fC42-=k20*c04+k21*c14;
-
- fC33-=k30*c03+k31*c13;
- fC43-=k30*c04+k31*c14;
+ Double_t p[2]={c->GetY(), c->GetZ()};
+ Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()};
- fC44-=k40*c04+k41*c14;
+ if (!AliExternalTrackParam::Update(p,cov)) return kFALSE;
if (!Invariant()) {
- fP0=p0; fP1=p1; fP2=p2; fP3=p3; fP4=p4;
- fC00=c00;
- fC10=c10; fC11=c11;
- fC20=c20; fC21=c21; fC22=c22;
- fC30=c30; fC31=c31; fC32=c32; fC33=c33;
- fC40=c40; fC41=c41; fC42=c42; fC43=c43; fC44=c44;
- return 0;
+ AliWarning("Wrong invariant !");
+ return kFALSE;
}
+ if (chi2<0) return kTRUE;
+
Int_t n=GetNumberOfClusters();
fIndex[n]=index;
SetNumberOfClusters(n+1);
SetChi2(GetChi2()+chi2);
- return 1;
+ return kTRUE;
}
-Int_t AliITStrackV2::Invariant() const {
+Bool_t AliITStrackV2::Invariant() const {
//------------------------------------------------------------------
// This function is for debugging purpose only
//------------------------------------------------------------------
Int_t n=GetNumberOfClusters();
-
- if (TMath::Abs(fP2)>=0.9999){
- if (n>kWARN) cout<<"AliITStrackV2::Invariant : fP2="<<fP2<<endl;
- return 0;
+
+ Double_t sP2=GetParameter()[2];
+ if (TMath::Abs(sP2) >= kAlmost1){
+ if (n>kWARN) Warning("Invariant","fP2=%f\n",sP2);
+ return kFALSE;
}
- if (fC00<=0 || fC00>9.) {
- if (n>kWARN) cout<<"AliITStrackV2::Invariant : fC00="<<fC00<<endl;
- return 0;
+ Double_t sC00=GetCovariance()[0];
+ if (sC00<=0 || sC00>9.) {
+ if (n>kWARN) Warning("Invariant","fC00=%f\n",sC00);
+ return kFALSE;
}
- if (fC11<=0 || fC11>9.) {
- if (n>kWARN) cout<<"AliITStrackV2::Invariant : fC11="<<fC11<<endl;
- return 0;
+ Double_t sC11=GetCovariance()[2];
+ if (sC11<=0 || sC11>9.) {
+ if (n>kWARN) Warning("Invariant","fC11=%f\n",sC11);
+ return kFALSE;
}
- if (fC22<=0 || fC22>1.) {
- if (n>kWARN) cout<<"AliITStrackV2::Invariant : fC22="<<fC22<<endl;
- return 0;
+ Double_t sC22=GetCovariance()[5];
+ if (sC22<=0 || sC22>1.) {
+ if (n>kWARN) Warning("Invariant","fC22=%f\n",sC22);
+ return kFALSE;
}
- if (fC33<=0 || fC33>1.) {
- if (n>kWARN) cout<<"AliITStrackV2::Invariant : fC33="<<fC33<<endl;
- return 0;
+ Double_t sC33=GetCovariance()[9];
+ if (sC33<=0 || sC33>1.) {
+ if (n>kWARN) Warning("Invariant","fC33=%f\n",sC33);
+ return kFALSE;
}
- if (fC44<=0 || fC44>6e-5) {
- if (n>kWARN) cout<<"AliITStrackV2::Invariant : fC44="<<fC44<<endl;
- return 0;
+ Double_t sC44=GetCovariance()[14];
+ if (sC44<=0 /*|| sC44>6e-5*/) {
+ if (n>kWARN) Warning("Invariant","fC44=%f\n",sC44);
+ return kFALSE;
}
- return 1;
+
+ return kTRUE;
}
//____________________________________________________________________________
-Int_t AliITStrackV2::Propagate(Double_t alp,Double_t xk) {
+Bool_t AliITStrackV2::Propagate(Double_t alp,Double_t xk) {
//------------------------------------------------------------------
//This function propagates a track
//------------------------------------------------------------------
- Double_t p0=fP0,p1=fP1,p2=fP2,p3=fP3,p4=fP4;
- Double_t c00=fC00;
- Double_t c10=fC10, c11=fC11;
- Double_t c20=fC20, c21=fC21, c22=fC22;
- Double_t c30=fC30, c31=fC31, c32=fC32, c33=fC33;
- Double_t c40=fC40, c41=fC41, c42=fC42, c43=fC43, c44=fC44;
-
-
- Double_t dalp=alp-fAlpha;
-
- Double_t ca=TMath::Cos(dalp), sa=TMath::Sin(dalp);
- Double_t sf=fP2, cf=TMath::Sqrt(1.- fP2*fP2);
-
- Double_t pp2=fP2*ca - cf*sa;
- if (TMath::Abs(pp2) >= 0.9999) {
- Int_t n=GetNumberOfClusters();
- if (n>kWARN)
- cerr<<n<<" AliITStrackV2::Propagate: Rotation failed !\n";
- return 0;
- }
-
- fAlpha = alp;
- if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
- else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
-
- Double_t x1=fX, y1=fP0;
-
- fX = x1*ca + y1*sa;
- fP0=-x1*sa + y1*ca;
- fP2 = pp2;
-
- cf=ca + sf*sa/cf;
-
- if (!Invariant()) return 0;
-
- x1=fX; Double_t x2=xk, dx=x2-x1;
- Double_t f1=fP2, f2=f1 + fP4*dx;
- if (TMath::Abs(f2) >= 0.9999) {
- Int_t n=GetNumberOfClusters();
- if (n>kWARN)
- cerr<<n<<" AliITStrackV2::Propagate: Propagation failed !\n";
- return 0;
- }
-
- Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2);
-
- fP0 += dx*(f1+f2)/(r1+r2);
- fP1 += dx*(f1+f2)/(f1*r2 + f2*r1)*fP3;
- fP2 += dx*fP4;
-
- //f = F - 1
- Double_t f02= dx/(r1*r1*r1);
- Double_t f04=0.5*dx*dx/(r1*r1*r1);
- Double_t f12= dx*fP3*f1/(r1*r1*r1);
- Double_t f14=0.5*dx*dx*fP3*f1/(r1*r1*r1);
- Double_t f13= dx/r1;
- Double_t f24= dx;
- /*
- //b = C*ft
- Double_t b00=f02*fC20 + f03*fC30, b01=f12*fC20 + f13*fC30 + f14*fC40;
- Double_t b02=f23*fC30;
- Double_t b10=f02*fC21 + f03*fC31, b11=f12*fC21 + f13*fC31 + f14*fC41;
- Double_t b12=f23*fC31;
- Double_t b20=f02*fC22 + f03*fC32, b21=f12*fC22 + f13*fC32 + f14*fC42;
- Double_t b22=f23*fC32;
- Double_t b30=f02*fC32 + f03*fC33, b31=f12*fC32 + f13*fC33 + f14*fC43;
- Double_t b32=f23*fC33;
- Double_t b40=f02*fC42 + f03*fC43, b41=f12*fC42 + f13*fC43 + f14*fC44;
- Double_t b42=f23*fC43;
-
- //a = f*b = f*C*ft
- Double_t a00=f02*b20+f03*b30,a01=f02*b21+f03*b31,a02=f02*b22+f03*b32;
- Double_t a11=f12*b21+f13*b31+f14*b41,a12=f12*b22+f13*b32+f14*b42;
- Double_t a22=f23*b32;
-
- //F*C*Ft = C + (b + bt + a)
- fC00 += b00 + b00 + a00;
- fC10 += b10 + b01 + a01;
- fC20 += b20 + b02 + a02;
- fC30 += b30;
- fC40 += b40;
- fC11 += b11 + b11 + a11;
- fC21 += b21 + b12 + a12;
- fC31 += b31;
- fC41 += b41;
- fC22 += b22 + b22 + a22;
- fC32 += b32;
- fC42 += b42;
-*/
-
- TMatrixD F(5,5); F.UnitMatrix();
- F(0,0)=-(f1+f2)/(r1+r2)*sa + ca; F(0,2)=f02*cf; F(0,4)=f04;
- F(1,0)=-(f1+f2)/(f1*r2 + f2*r1)*fP3*sa; F(1,2)=f12*cf; F(1,4)=f14; F(1,3)=f13;
- F(2,0)=-fP4*sa; F(2,2)=cf; F(2,4)=f24;
-
- TMatrixD C(5,5);
- C(0,0)=fC00;
- C(1,0)=fC10; C(1,1)=fC11;
- C(2,0)=fC20; C(2,1)=fC21; C(2,2)=fC22;
- C(3,0)=fC30; C(3,1)=fC31; C(3,2)=fC32; C(3,3)=fC33;
- C(4,0)=fC40; C(4,1)=fC41; C(4,2)=fC42; C(4,3)=fC43; C(4,4)=fC44;
-
- C(0,1)=C(1,0);
- C(0,2)=C(2,0); C(1,2)=C(2,1);
- C(0,3)=C(3,0); C(1,3)=C(3,1); C(2,3)=C(3,2);
- C(0,4)=C(4,0); C(1,4)=C(4,1); C(2,4)=C(4,2); C(3,4)=C(4,3);
-
- TMatrixD tmp(C,TMatrixD::kMult,TMatrixD(TMatrixD::kTransposed, F));
- C.Mult(F,tmp);
-
- fC00=C(0,0);
- fC10=C(1,0); fC11=C(1,1);
- fC20=C(2,0); fC21=C(2,1); fC22=C(2,2);
- fC30=C(3,0); fC31=C(3,1); fC32=C(3,2); fC33=C(3,3);
- fC40=C(4,0); fC41=C(4,1); fC42=C(4,2); fC43=C(4,3); fC44=C(4,4);
+ Double_t bz=GetBz();
+ if (!AliExternalTrackParam::Propagate(alp,xk,bz)) return kFALSE;
if (!Invariant()) {
- fP0=p0; fP1=p1; fP2=p2; fP3=p3; fP4=p4;
- fC00=c00;
- fC10=c10; fC11=c11;
- fC20=c20; fC21=c21; fC22=c22;
- fC30=c30; fC31=c31; fC32=c32; fC33=c33;
- fC40=c40; fC41=c41; fC42=c42; fC43=c43; fC44=c44;
- return 0;
+ AliWarning("Wrong invariant !");
+ return kFALSE;
}
- fX=x2;
-
- return 1;
+ return kTRUE;
}
-Double_t AliITStrackV2::GetD(Double_t x, Double_t y) const {
+Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) {
//------------------------------------------------------------------
- // This function calculates the transverse impact parameter
- // with respect to a point with global coordinates (x,y)
+ //This function improves angular track parameters
//------------------------------------------------------------------
- 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;
- xt-=x; yt-=y;
-
- sn=fP4*xt - fP2; cs=fP4*yt + TMath::Sqrt(1.- fP2*fP2);
- a=2*(xt*fP2 - yt*TMath::Sqrt(1.- fP2*fP2))-fP4*(xt*xt + yt*yt);
- if (fP4<0) a=-a;
- return a/(1 + TMath::Sqrt(sn*sn + cs*cs));
-}
+ Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha());
+//Double_t xv = xyz[0]*cs + xyz[1]*sn; // vertex
+ Double_t yv =-xyz[0]*sn + xyz[1]*cs; // in the
+ Double_t zv = xyz[2]; // local frame
-Int_t AliITStrackV2::Improve(Double_t x0,Double_t yv,Double_t zv) {
- //------------------------------------------------------------------
- //This function improves angular track parameters
- //------------------------------------------------------------------
- Double_t dy=fP0-yv, dz=fP1-zv;
- Double_t r2=fX*fX+dy*dy;
+ Double_t dy = Par(0) - yv, dz = Par(1) - zv;
+ Double_t r2=GetX()*GetX() + dy*dy;
Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
Double_t beta2=p2/(p2 + GetMass()*GetMass());
x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp()));
- //Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0;
- Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33;
+ Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0;
+ //Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33;
+
+ Double_t cnv=GetBz()*kB2C;
{
- Double_t parp=0.5*(fP4*fX + dy*TMath::Sqrt(4/r2-fP4*fP4));
- Double_t sigma2p = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl());
- sigma2p += fC00/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2);
- sigma2p += kSigmaYV*kSigmaYV/r2;
- sigma2p += 0.25*fC44*fX*fX;
- Double_t eps2p=sigma2p/(fC22+sigma2p);
- fP0 += fC20/(fC22+sigma2p)*(parp-fP2);
- fP2 = eps2p*fP2 + (1-eps2p)*parp;
- fC22 *= eps2p;
- fC20 *= eps2p;
+ Double_t dummy = 4/r2 - GetC()*GetC();
+ if (dummy < 0) return kFALSE;
+ Double_t parp = 0.5*(GetC()*GetX() + dy*TMath::Sqrt(dummy));
+ Double_t sigma2p = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl());
+ sigma2p += Cov(0)/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2);
+ sigma2p += ers[1]*ers[1]/r2;
+ sigma2p += 0.25*Cov(14)*cnv*cnv*GetX()*GetX();
+ Double_t eps2p=sigma2p/(Cov(2) + sigma2p);
+ Par(0) += Cov(3)/(Cov(5) + sigma2p)*(parp - GetSnp());
+ Par(2) = eps2p*GetSnp() + (1 - eps2p)*parp;
+ Cov(5) *= eps2p;
+ Cov(3) *= eps2p;
}
{
- Double_t parl=0.5*fP4*dz/TMath::ASin(0.5*fP4*TMath::Sqrt(r2));
- Double_t sigma2l=theta2;
- sigma2l += fC11/r2+fC00*dy*dy*dz*dz/(r2*r2*r2);
- sigma2l += kSigmaZV*kSigmaZV/r2;
- Double_t eps2l=sigma2l/(fC33+sigma2l);
- fP1 += fC31/(fC33+sigma2l)*(parl-fP3);
- fP4 += fC43/(fC33+sigma2l)*(parl-fP3);
- fP3 = eps2l*fP3 + (1-eps2l)*parl;
- fC33 *= eps2l; fC43 *= eps2l;
- fC31 *= eps2l;
+ Double_t parl=0.5*GetC()*dz/TMath::ASin(0.5*GetC()*TMath::Sqrt(r2));
+ Double_t sigma2l=theta2;
+ sigma2l += Cov(2)/r2 + Cov(0)*dy*dy*dz*dz/(r2*r2*r2);
+ sigma2l += ers[2]*ers[2]/r2;
+ Double_t eps2l = sigma2l/(Cov(9) + sigma2l);
+ Par(1) += Cov(7 )/(Cov(9) + sigma2l)*(parl - Par(3));
+ Par(4) += Cov(13)/(Cov(9) + sigma2l)*(parl - Par(3));
+ Par(3) = eps2l*Par(3) + (1-eps2l)*parl;
+ Cov(9) *= eps2l;
+ Cov(13)*= (eps2l/cnv/cnv);
+ Cov(7) *= eps2l;
}
- if (!Invariant()) return 0;
- return 1;
-}
-
-/*
-Int_t AliITStrackV2::Improve(Double_t x0,Double_t yv,Double_t zv) {
- //------------------------------------------------------------------
- //This function improves angular track parameters
- //------------------------------------------------------------------
- Double_t dy=fP0-yv, dz=fP1-zv;
- Double_t r2=fX*fX+dy*dy;
- Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
- Double_t beta2=p2/(p2 + GetMass()*GetMass());
- x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp()));
- //Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0;
- Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33;
-
- Double_t par=0.5*(fP4*fX + dy*TMath::Sqrt(4/r2-fP4*fP4));
- Double_t sigma2 = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl());
- sigma2 += fC00/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2);
- sigma2 += kSigmaYV*kSigmaYV/r2;
- sigma2 += 0.25*fC44*fX*fX;
- Double_t eps2=sigma2/(fC22+sigma2), eps=TMath::Sqrt(eps2);
- if (10*r2*fC44<fC22) {
- fP2 = eps2*fP2 + (1-eps2)*par;
- fC22*=eps2; fC21*=eps; fC20*=eps; fC32*=eps; fC42*=eps;
- }
-
- par=0.5*fP4*dz/TMath::ASin(0.5*fP4*TMath::Sqrt(r2));
- sigma2=theta2;
- sigma2 += fC11/r2+fC00*dy*dy*dz*dz/(r2*r2*r2);
- sigma2 += kSigmaZV*kSigmaZV/r2;
- eps2=sigma2/(fC33+sigma2); eps=TMath::Sqrt(eps2);
- Double_t tgl=fP3;
- fP3 = eps2*fP3 + (1-eps2)*par;
- fC33*=eps2; fC32*=eps; fC31*=eps; fC30*=eps; fC43*=eps;
-
- eps=TMath::Sqrt((1+fP3*fP3)/(1+tgl*tgl));
- fP4*=eps;
- fC44*=eps*eps; fC43*=eps;fC42*=eps; fC41*=eps; fC40*=eps;
-
- if (!Invariant()) return 0;
- return 1;
-}
-*/
-void AliITStrackV2::ResetCovariance() {
- //------------------------------------------------------------------
- //This function makes a track forget its history :)
- //------------------------------------------------------------------
-
- fC00*=10.;
- fC10=0.; fC11*=10.;
- fC20=0.; fC21=0.; fC22*=10.;
- fC30=0.; fC31=0.; fC32=0.; fC33*=10.;
- fC40=0.; fC41=0.; fC42=0.; fC43=0.; fC44*=10.;
+ if (!Invariant()) return kFALSE;
+ return kTRUE;
}
void AliITStrackV2::CookdEdx(Double_t low, Double_t up) {
// This function calculates dE/dX within the "low" and "up" cuts.
// Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
//-----------------------------------------------------------------
- Int_t i;
- Int_t nc=4;
// The clusters order is: SSD-2, SSD-1, SDD-2, SDD-1, SPD-2, SPD-1
- // Take only SSD and SDD
+
+ Int_t i;
+ Int_t nc=0;
+ for (i=0; i<GetNumberOfClusters(); i++) {
+ Int_t idx=GetClusterIndex(i);
+ idx=(idx&0xf0000000)>>28;
+ if (idx>1) nc++; // Take only SSD and SDD
+ }
Int_t swap;//stupid sorting
do {
// nu=2
Float_t dedx=0;
for (i=nl; i<nu; i++) dedx += fdEdxSample[i];
- dedx /= (nu-nl);
+ if (nu-nl>0) dedx /= (nu-nl);
SetdEdx(dedx);
}
+
+Double_t AliITStrackV2::GetBz() const {
+ //
+ // returns Bz component of the magnetic field (kG)
+ //
+ if (AliTracker::UniformField()) return AliTracker::GetBz();
+ Double_t r[3]; GetXYZ(r);
+ return AliTracker::GetBz(r);
+}
+
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff