X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=ITS%2FAliITStrackV2.cxx;h=6edcfebfd48180d7c2939e142fc065c66ea94531;hb=2c632057b20a755472de41d084d02d410a4d451d;hp=814a66c98851155580deb63b22492c44e6822027;hpb=e43c066cbc76252a79f11f5bc1435a37cbc8bed3;p=u%2Fmrichter%2FAliRoot.git diff --git a/ITS/AliITStrackV2.cxx b/ITS/AliITStrackV2.cxx index 814a66c9885..6edcfebfd48 100644 --- a/ITS/AliITStrackV2.cxx +++ b/ITS/AliITStrackV2.cxx @@ -13,228 +13,92 @@ * provided "as is" without express or implied warranty. * **************************************************************************/ -//------------------------------------------------------------------------- +/* $Id$ */ + +/////////////////////////////////////////////////////////////////////////// // 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 - +/////////////////////////////////////////////////////////////////////////// #include #include "AliCluster.h" -#include "AliTPCtrack.h" +#include "AliTracker.h" #include "AliESDtrack.h" #include "AliITStrackV2.h" +const Int_t AliITStrackV2::fgkWARN = 5; + ClassImp(AliITStrackV2) -const Int_t kWARN=5; //____________________________________________________________________________ -AliITStrackV2::AliITStrackV2():AliKalmanTrack(), - fX(0), - fAlpha(0), +AliITStrackV2::AliITStrackV2() : AliKalmanTrack(), fdEdx(0), - fP0(0), - fP1(0), - fP2(0), - fP3(0), - fP4(0), - fC00(0), - fC10(0), - fC11(0), - fC20(0), - fC21(0), - fC22(0), - fC30(0), - fC31(0), - fC32(0), - fC33(0), - fC40(0), - fC41(0), - fC42(0), - fC43(0), - fC44(0), - fNUsed(0), - fNSkipped(0), - fNDeadZone(0), - fDeadZoneProbability(0), - fReconstructed(kFALSE), - fConstrain(kFALSE), fESDtrack(0) { - for(Int_t i=0; i ITS track - //------------------------------------------------------------------ - SetChi2(0.); - SetNumberOfClusters(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(); - - //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; - - //Conversion of the covariance matrix - Double_t c[15]; t.GetExternalCovariance(c); - - 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; - - for(Int_t i=0; i<6; i++) { fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000;} - for(Int_t i=0; i<12; i++) {fDy[i]=0; fDz[i]=0; fSigmaY[i]=0; fSigmaZ[i]=0; } - fConstrain=kFALSE; - // - if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; - -} //____________________________________________________________________________ AliITStrackV2::AliITStrackV2(AliESDtrack& t,Bool_t c) throw (const Char_t *) : -AliKalmanTrack() { + AliKalmanTrack(), + fdEdx(t.GetITSsignal()), + fESDtrack(&t) +{ //------------------------------------------------------------------ // Conversion ESD track -> ITS track. // If c==kTRUE, create the ITS track out of the constrained params. //------------------------------------------------------------------ - SetNumberOfClusters(t.GetITSclusters(fIndex)); + 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()); + + //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; + SetLabel(t.GetLabel()); SetMass(t.GetMass()); - // - // - - fdEdx=t.GetITSsignal(); - 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]; - if (c) t.GetConstrainedExternalParameters(x,p); - else t.GetExternalParameters(x,p); - fX=x; x=GetConvConst(); - fP0=p[0]; - fP1=p[1]; - fP2=p[2]; - fP3=p[3]; - fP4=p[4]/x; - - //Conversion of the covariance matrix - Double_t cv[15]; - if (c) t.GetConstrainedExternalCovariance(cv); - else t.GetExternalCovariance(cv); - fC00=cv[0 ]; - fC10=cv[1 ]; fC11=cv[2 ]; - fC20=cv[3 ]; fC21=cv[4 ]; fC22=cv[5 ]; - fC30=cv[6 ]; fC31=cv[7 ]; fC32=cv[8 ]; fC33=cv[9 ]; - fC40=cv[10]/x; fC41=cv[11]/x; fC42=cv[12]/x; fC43=cv[13]/x; fC44=cv[14]/x/x; + SetNumberOfClusters(t.GetITSclusters(fIndex)); if (t.GetStatus()&AliESDtrack::kTIME) { StartTimeIntegral(); Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); SetIntegratedLength(t.GetIntegratedLength()); } - fESDtrack=&t; - fNUsed = 0; - fReconstructed = kFALSE; - fNSkipped =0; - fNDeadZone = 0; - fDeadZoneProbability = 0; - for(Int_t i=0; i<6; i++) {fClIndex[i]=-1; fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000;} - for(Int_t i=0; i<12; i++) {fDy[i]=0; fDz[i]=0; fSigmaY[i]=0; fSigmaZ[i]=0;fChi2MIP[i]=0;} - fD[0]=0; fD[1]=0; - fExpQ=40; - fConstrain = kFALSE; - fdEdxMismatch=0; - fChi22 =0; - - //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; + for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; } -void AliITStrackV2::UpdateESDtrack(ULong_t flags) { +void AliITStrackV2::UpdateESDtrack(ULong_t flags) const { fESDtrack->UpdateTrackParams(this,flags); - if (flags == AliESDtrack::kITSin) fESDtrack->SetITSChi2MIP(fChi2MIP); -} -void AliITStrackV2::SetConstrainedESDtrack(Double_t chi2) { - fESDtrack->SetConstrainedTrackParams(this,chi2); + // copy the module indices + for(Int_t i=0;i<12;i++) { + // printf(" %d\n",GetModuleIndex(i)); + fESDtrack->SetITSModuleIndex(i,GetModuleIndex(i)); + } } //____________________________________________________________________________ -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; iGet1Pt()); - //Double_t c =TMath::Abs(Get1Pt()); - Double_t co=t->GetSigmaY2()*t->GetSigmaZ2()*(0.5+TMath::Sqrt(0.5*t->fD[0]*t->fD[0]+t->fD[1]*t->fD[1])); - Double_t c =GetSigmaY2()*GetSigmaZ2()*(0.5+TMath::Sqrt(0.5*fD[0]*fD[0]+fD[1]*fD[1])); + //Double_t co=OneOverPt(); + //Double_t c =OneOverPt(); + Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); + Double_t c =GetSigmaY2()*GetSigmaZ2(); if (c>co) return 1; else if (c= 0.9999) { - Int_t n=GetNumberOfClusters(); - if (n>kWARN) - Warning("GetGlobalXYZat","Propagation failed (%d) !\n",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(xloc, 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) - Warning("GetPredictedChi2","Singular matrix (%d) !\n",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::GetPredictedChi2MI(Double_t cy, Double_t cz, Double_t cerry, Double_t cerrz) const -{ - //----------------------------------------------------------------- - // This function calculates a predicted chi2 increment. - //----------------------------------------------------------------- - Double_t r00=cerry*cerry, r01=0., r11=cerrz*cerrz; - 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) - Warning("GetPredictedChi2","Singular matrix (%d) !\n",n); - return 1e10; - } - Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; - - Double_t dy=cy - fP0, dz=cz - fP1; - - return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; + 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::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 p2=(1.+ fP3*fP3)/(Get1Pt()*Get1Pt()); - Double_t et = p2 + GetMass()*GetMass(); - Double_t beta2=p2/et; - et = sqrt(et); - d*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2)); - //d*=TMath::Sqrt(1.+ fP3*fP3 +fP2*fP2/(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; - //Double_t dE=0; - Double_t dE = 0.265*0.153e-3*(39.2-55.6*beta2+28.7*beta2*beta2+27.41/beta2)*d; - /* - if (beta2/(1-beta2)>3.5*3.5){ - dE=0.153e-3/beta2*(log(3.5*5940)+0.5*log(beta2/(1-beta2)) - beta2)*d; - } - else{ - dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d; - dE+=0.06e-3/(beta2*beta2)*d; - } - */ - fP4*=(1.- et/p2*dE); - Double_t delta44 = (dE*fP4*et/p2); - delta44*=delta44; - fC44+= delta44/400.; - } - - if (!Invariant()) return 0; - - return 1; -} - -//____________________________________________________________________________ -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) - Warning("PropagateTo","Propagation failed !\n",n); - return 0; - } - - // old position [SR, GSI, 17.02.2003] - Double_t oldX = fX, oldY = fP0, oldZ = fP1; - - 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 + 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; + Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ(); - //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; - - // Integrated Time [SR, GSI, 17.02.2003] - if (IsStartedTimeIntegral() && fX>oldX) { - Double_t l2 = (fX-oldX)*(fX-oldX)+(fP0-oldY)*(fP0-oldY)+ - (fP1-oldZ)*(fP1-oldZ); + Double_t bz=GetBz(); + if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE; + Double_t xOverX0,xTimesRho; + xOverX0 = d; xTimesRho = d*x0; + if (!CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) 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)); } - // - return 1; + return kTRUE; } //____________________________________________________________________________ -Int_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, UInt_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; - Int_t layer = (index & 0xf0000000) >> 28; - fDy[layer] = dy; - fDz[layer] = dz; - fSigmaY[layer] = TMath::Sqrt(c->GetSigmaY2()+fC00); - fSigmaZ[layer] = TMath::Sqrt(c->GetSigmaZ2()+fC11); - - 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; +Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho) { + //------------------------------------------------------------------- + // Propagates the track to a reference plane x=xToGo in n steps. + // These n steps are only used to take into account the curvature. + // The material is calculated with TGeo. (L.Gaudichet) + //------------------------------------------------------------------- - 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; + Double_t startx = GetX(), starty = GetY(), startz = GetZ(); + Double_t sign = (startxstartx) { + Double_t l2 = ( (GetX()-startx)*(GetX()-startx) + + (GetY()-starty)*(GetY()-starty) + + (GetZ()-startz)*(GetZ()-startz) ); + AddTimeStep(TMath::Sqrt(l2)); + } - return 1; + return kTRUE; } //____________________________________________________________________________ -Int_t AliITStrackV2::UpdateMI(Double_t cy, Double_t cz, Double_t cerry, Double_t cerrz, 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=cerry*cerry, r01=0., r11=cerrz*cerrz; - 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=cy - fP0, dz=cz - fP1; - Int_t layer = (index & 0xf0000000) >> 28; - fDy[layer] = dy; - fDz[layer] = dz; - fSigmaY[layer] = TMath::Sqrt(cerry*cerry+fC00); - fSigmaZ[layer] = TMath::Sqrt(cerrz*cerrz+fC11); - - 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; + Double_t p[2]={c->GetY(), c->GetZ()}; + Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; - 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; - - 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 1; + if (chi2<0) return kTRUE; + + AliTracker::FillResiduals(this,p,cov,c->GetVolumeId()); + 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) Warning("Invariant","fP2=%f\n",fP2); - return 0; + + Double_t sP2=GetParameter()[2]; + if (TMath::Abs(sP2) >= kAlmost1){ + if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2); + return kFALSE; } - if (fC00<=0 || fC00>9.) { - if (n>kWARN) Warning("Invariant","fC00=%f\n",fC00); - return 0; + Double_t sC00=GetCovariance()[0]; + if (sC00<=0 || sC00>9.) { + if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00); + return kFALSE; } - if (fC11<=0 || fC11>9.) { - if (n>kWARN) Warning("Invariant","fC11=%f\n",fC11); - return 0; + Double_t sC11=GetCovariance()[2]; + if (sC11<=0 || sC11>9.) { + if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11); + return kFALSE; } - if (fC22<=0 || fC22>1.) { - if (n>kWARN) Warning("Invariant","fC22=%f\n",fC22); - return 0; + Double_t sC22=GetCovariance()[5]; + if (sC22<=0 || sC22>1.) { + if (n>fgkWARN) Warning("Invariant","fC22=%f\n",sC22); + return kFALSE; } - if (fC33<=0 || fC33>1.) { - if (n>kWARN) Warning("Invariant","fC33=%f\n",fC33); - return 0; + Double_t sC33=GetCovariance()[9]; + if (sC33<=0 || sC33>1.) { + if (n>fgkWARN) Warning("Invariant","fC33=%f\n",sC33); + return kFALSE; } - if (fC44<=0 || fC44>6e-5) { - if (n>kWARN) Warning("Invariant","fC44=%f\n",fC44); - return 0; + Double_t sC44=GetCovariance()[14]; + if (sC44<=0 /*|| sC44>6e-5*/) { + if (n>fgkWARN) 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 alpha=fAlpha, x=fX; - 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; - - if (alp < -TMath::Pi()) alp += 2*TMath::Pi(); - else if (alp >= TMath::Pi()) alp -= 2*TMath::Pi(); - Double_t ca=TMath::Cos(alp-fAlpha), sa=TMath::Sin(alp-fAlpha); - Double_t sf=fP2, cf=TMath::Sqrt(1.- fP2*fP2); - - TMatrixD *T=0; - // **** rotation ********************** - { - fAlpha = alp; - fX = x*ca + p0*sa; - fP0= -x*sa + p0*ca; - fP2= sf*ca - cf*sa; - - static TMatrixD C(5,5); - C(0,0)=c00; - C(1,0)=c10; C(1,1)=c11; - C(2,0)=c20; C(2,1)=c21; C(2,2)=c22; - C(3,0)=c30; C(3,1)=c31; C(3,2)=c32; C(3,3)=c33; - C(4,0)=c40; C(4,1)=c41; C(4,2)=c42; C(4,3)=c43; C(4,4)=c44; - 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); - - - static TMatrixD F(6,5); - F(0,0)=sa; - F(1,0)=ca; - F(2,1)=F(4,3)=F(5,4)=1; - F(3,2)=ca + sf/cf*sa; - - //TMatrixD tmp(C,TMatrixD::kMult,TMatrixD(TMatrixD::kTransposed, F)); - - static TMatrixD Ft(5,6); - Ft(0,0)=sa; - Ft(0,1)=ca; - Ft(1,2)=Ft(3,4)=Ft(4,5)=1; - Ft(2,3)=ca + sf/cf*sa; - - TMatrixD tmp(C,TMatrixD::kMult,Ft); - T=new TMatrixD(F,TMatrixD::kMult,tmp); - - - } - - // **** translation ****************** - { - 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) - Warning("Propagate","Propagation failed (%d) !\n",n); - return 0; - } - Double_t r1=TMath::Sqrt(1.- f1*f1), r2=TMath::Sqrt(1.- f2*f2); - - fX=xk; - fP0 += dx*(f1+f2)/(r1+r2); - fP1 += dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; - fP2 += dx*fP4; - - static TMatrixD F(5,6); - F(0,1)=F(1,2)=F(2,3)=F(3,4)=F(4,5)=1; - F(0,3)=dx/(r1+r2)*(2+(f1+f2)*(f2/r2+f1/r1)/(r1+r2)); - F(0,5)=dx*dx/(r1+r2)*(1+(f1+f2)*f2/(r1+r2)); - F(1,3)=dx*fP3/(f1*r2 + f2*r1)*(2-(f1+f2)*(r2-f1*f2/r2+r1-f2*f1/r1)/(f1*r2 + f2*r1)); - F(1,4)=dx*(f1+f2)/(f1*r2 + f2*r1); - F(1,5)=dx*dx*fP3/(f1*r2 + f2*r1)*(1-(f1+f2)*(-f1*f2/r2+r1)/(f1*r2 + f2*r1)); - F(2,5)=dx; - F(0,0)=-1/(r1+r2)*((f1+f2)+dx*fP4*(1+(f1+f2)/(r1+r2)*f2/r2)); - F(1,0)=-fP3/(f1*r2 + f2*r1)*((f1+f2)+dx*fP4*(1+(f1+f2)/(f1*r2 + f2*r1)*(f1*f2/r2-r1))); - F(2,0)=-fP4; - - TMatrixD tmp(*T,TMatrixD::kMult,TMatrixD(TMatrixD::kTransposed, F)); - delete T; - TMatrixD C(F,TMatrixD::kMult,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()) { - fAlpha=alpha; - fX=x; - 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; } - return 1; + return kTRUE; } +Bool_t AliITStrackV2::MeanBudgetToPrimVertex(Double_t xyz[3], Double_t step, Double_t &d) const { + //------------------------------------------------------------------- + // Get the mean material budget between the actual point and the + // primary vertex. (L.Gaudichet) + //------------------------------------------------------------------- -Int_t AliITStrackV2::GetProlongationFast(Double_t alp, Double_t xk,Double_t &y, Double_t &z) -{ - //----------------------------------------------------------------------------- - //get fast prolongation - //----------------------------------------------------------------------------- - Double_t ca=TMath::Cos(alp-fAlpha), sa=TMath::Sin(alp-fAlpha); - Double_t cf=TMath::Sqrt(1.- fP2*fP2); - // **** rotation ********************** - y= -fX*sa + fP0*ca; - // **** translation ****************** - Double_t dx = xk- fX*ca - fP0*sa; - Double_t f1=fP2*ca - cf*sa, f2=f1 + fP4*dx; - if (TMath::Abs(f2) >= 0.9999) { - return 0; - } - Double_t r1=TMath::Sqrt(1.- f1*f1), r2=TMath::Sqrt(1.- f2*f2); - y += dx*(f1+f2)/(r1+r2); - z = fP1+dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; - return 1; -} + Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); + Double_t vertexX = xyz[0]*cs + xyz[1]*sn; + Int_t nstep = Int_t((GetX()-vertexX)/step); + if (nstep<1) nstep = 1; + step = (GetX()-vertexX)/nstep; -Double_t AliITStrackV2::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 mparam[7], densMean=0, radLength=0, length=0; + Double_t mparam[7]; + Double_t p1[3], p2[3], x = GetX(), bz = GetBz(); + GetXYZ(p1); - 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; + d=0.; - 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)); -} + for (Int_t i=0; i900000) return kFALSE; + d += mparam[1]; -Double_t AliITStrackV2::GetZat(Double_t x) const { - //------------------------------------------------------------------ - // This function calculates the z at given x point - in current coordinate system - //------------------------------------------------------------------ - Double_t x1=fX, x2=x, dx=x2-x1; - // - Double_t f1=fP2, f2=f1 + fP4*dx; - if (TMath::Abs(f2) >= 0.9999) { - return 10000000; + p1[0] = p2[0]; + p1[1] = p2[1]; + p1[2] = p2[2]; } - Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2); - Double_t z = fP1 + dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; - return z; -} - - + return kTRUE; +} -Int_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) { +Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) { //------------------------------------------------------------------ - //This function improves angular track parameters + //This function improves angular track parameters //------------------------------------------------------------------ - Double_t cs=TMath::Cos(fAlpha), sn=TMath::Sin(fAlpha); - //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 - 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 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 + + Double_t dy = Par(0) - yv, dz = Par(1) - zv; + Double_t r2=GetX()*GetX() + dy*dy; + Double_t p2=(1.+ GetTgl()*GetTgl())/(GetSigned1Pt()*GetSigned1Pt()); 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 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 += ers[1]*ers[1]/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(5) + 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 += ers[2]*ers[2]/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; - } - 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 r) return kFALSE; + + Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); + if (TMath::Abs(d) > rcurr) return kFALSE; + Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp()); + + phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); + z=GetZ()+GetTgl()*(TMath::Sqrt((r-d)*(r+d))-TMath::Sqrt((rcurr-d)*(rcurr+d))); + return kTRUE; +} +//____________________________________________________________________________ +Bool_t AliITStrackV2:: +GetLocalXat(Double_t r,Double_t &xloc) const { + //------------------------------------------------------------------ + // This function returns the local x of the track + // position estimated at the radius r. + // The track curvature is neglected. + //------------------------------------------------------------------ + Double_t d=GetD(0.,0.); + if (TMath::Abs(d) > r) return kFALSE; + + Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); + Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp()); + Double_t phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); + + xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha()) + +TMath::Sin(phi)*TMath::Sin(GetAlpha())); + + return kTRUE; +} +