* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.2 2000/10/06 16:49:46 cblume
-Made Getters const
+/* $Id$ */
-Revision 1.1.2.1 2000/09/22 14:47:52 cblume
-Add the tracking code
+#include <Riostream.h>
+#include <TMath.h>
+#include <TVector2.h>
-*/
-
-#include <iostream.h>
-
-#include <TObject.h>
-
-#include "AliTRD.h"
+#include "AliESDtrack.h"
#include "AliTRDgeometry.h"
#include "AliTRDcluster.h"
#include "AliTRDtrack.h"
+#include "AliTRDtracklet.h"
ClassImp(AliTRDtrack)
+///////////////////////////////////////////////////////////////////////////////
+// //
+// Represents a reconstructed TRD track //
+// Local TRD Kalman track //
+// //
+///////////////////////////////////////////////////////////////////////////////
//_____________________________________________________________________________
+AliTRDtrack::AliTRDtrack()
+ :AliKalmanTrack()
+ ,fSeedLab(-1)
+ ,fdEdx(0)
+ ,fDE(0)
+ ,fAlpha(0)
+ ,fX(0)
+ ,fStopped(kFALSE)
+ ,fY(0)
+ ,fZ(0)
+ ,fE(0)
+ ,fT(0)
+ ,fC(0)
+ ,fCyy(1e10)
+ ,fCzy(0)
+ ,fCzz(1e10)
+ ,fCey(0)
+ ,fCez(0)
+ ,fCee(1e10)
+ ,fCty(0)
+ ,fCtz(0)
+ ,fCte(0)
+ ,fCtt(1e10)
+ ,fCcy(0)
+ ,fCcz(0)
+ ,fCce(0)
+ ,fCct(0)
+ ,fCcc(1e10)
+ ,fLhElectron(0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(1e10)
+ ,fBackupTrack(0x0)
+{
+ //
+ // AliTRDtrack default constructor
+ //
+
+ Int_t i = 0;
+ Int_t j = 0;
+ UInt_t k = 0;
+
+ for (i = 0; i < kNplane; i++) {
+ for (j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = 0;
+ }
+ fTimBinPlane[i] = -1;
+ }
+
+ for (k = 0; k < kMAXCLUSTERSPERTRACK; k++) {
+ fIndex[k] = 0;
+ fIndexBackup[k] = 0;
+ fdQdl[k] = 0;
+ }
+
+ for (i = 0; i < 3; i++) {
+ fBudget[i] = 0;
+ }
+
+}
+
+//_____________________________________________________________________________
+AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index,
+ const Double_t xx[5], const Double_t cc[15],
+ Double_t xref, Double_t alpha)
+ :AliKalmanTrack()
+ ,fSeedLab(-1)
+ ,fdEdx(0.0)
+ ,fDE(0.0)
+ ,fAlpha(alpha)
+ ,fX(xref)
+ ,fStopped(kFALSE)
+ ,fY(xx[0])
+ ,fZ(xx[1])
+ ,fE(xx[2])
+ ,fT(xx[3])
+ ,fC(xx[4])
+ ,fCyy(cc[0])
+ ,fCzy(cc[1])
+ ,fCzz(cc[2])
+ ,fCey(cc[3])
+ ,fCez(cc[4])
+ ,fCee(cc[5])
+ ,fCty(cc[6])
+ ,fCtz(cc[7])
+ ,fCte(cc[8])
+ ,fCtt(cc[9])
+ ,fCcy(cc[10])
+ ,fCcz(cc[11])
+ ,fCce(cc[12])
+ ,fCct(cc[13])
+ ,fCcc(cc[14])
+ ,fLhElectron(0.0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(1e10)
+ ,fBackupTrack(0x0)
+{
+ //
+ // AliTRDtrack main constructor
+ //
+
+ Int_t i = 0;
+ Int_t j = 0;
+ UInt_t k = 0;
+
+ if (fAlpha < -TMath::Pi()) {
+ fAlpha += 2.0 * TMath::Pi();
+ }
+ if (fAlpha >= TMath::Pi()) {
+ fAlpha -= 2.0 * TMath::Pi();
+ }
+
+ SaveLocalConvConst();
-AliTRDtrack::AliTRDtrack(UInt_t index, const Double_t xx[5],
-const Double_t cc[15], Double_t xref, Double_t alpha) {
- //-----------------------------------------------------------------
- // This is the main track constructor.
- //-----------------------------------------------------------------
- fLab=-1;
- fChi2=0.;
- fdEdx=0.;
+ fIndex[0] = index;
+ SetNumberOfClusters(1);
- fAlpha=alpha;
- fX=xref;
+ for (i = 0; i < kNplane; i++) {
+ for (j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = 0;
+ }
+ fTimBinPlane[i] = -1;
+ }
- fY=xx[0]; fZ=xx[1]; fC=xx[2]; fE=xx[3]; fT=xx[4];
+ Double_t q = TMath::Abs(c->GetQ());
+ Double_t s = fX * fC - fE;
+ Double_t t = fT;
+ if (s*s < 1.0) {
+ q *= TMath::Sqrt((1-s*s)/(1+t*t));
+ }
+ fdQdl[0] = q;
+
+ for (k = 1; k < kMAXCLUSTERSPERTRACK; k++) {
+ fdQdl[k] = 0;
+ fIndex[k] = 0;
+ fIndexBackup[k] = 0;
+ }
- fCyy=cc[0];
- fCzy=cc[1]; fCzz=cc[2];
- fCcy=cc[3]; fCcz=cc[4]; fCcc=cc[5];
- fCey=cc[6]; fCez=cc[7]; fCec=cc[8]; fCee=cc[9];
- fCty=cc[10]; fCtz=cc[11]; fCtc=cc[12]; fCte=cc[13]; fCtt=cc[14];
+ for (i = 0; i < 3; i++) {
+ fBudget[i] = 0;
+ }
- fN=0;
- fIndex[fN++]=index;
}
//_____________________________________________________________________________
-AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) {
+AliTRDtrack::AliTRDtrack(const AliTRDtrack &t)
+ :AliKalmanTrack(t)
+ ,fSeedLab(t.fSeedLab)
+ ,fdEdx(t.fdEdx)
+ ,fDE(t.fDE)
+ ,fAlpha(t.fAlpha)
+ ,fX(t.fX)
+ ,fStopped(t.fStopped)
+ ,fY(t.fY)
+ ,fZ(t.fZ)
+ ,fE(t.fE)
+ ,fT(t.fT)
+ ,fC(t.fC)
+ ,fCyy(t.fCyy)
+ ,fCzy(t.fCzy)
+ ,fCzz(t.fCzz)
+ ,fCey(t.fCey)
+ ,fCez(t.fCez)
+ ,fCee(t.fCee)
+ ,fCty(t.fCty)
+ ,fCtz(t.fCtz)
+ ,fCte(t.fCte)
+ ,fCtt(t.fCtt)
+ ,fCcy(t.fCcy)
+ ,fCcz(t.fCcz)
+ ,fCce(t.fCce)
+ ,fCct(t.fCct)
+ ,fCcc(t.fCcc)
+ ,fLhElectron(0.0)
+ ,fNWrong(t.fNWrong)
+ ,fNRotate(t.fNRotate)
+ ,fNCross(t.fNCross)
+ ,fNExpected(t.fNExpected)
+ ,fNLast(t.fNLast)
+ ,fNExpectedLast(t.fNExpectedLast)
+ ,fNdedx(t.fNdedx)
+ ,fChi2Last(t.fChi2Last)
+ ,fBackupTrack(0x0)
+{
//
// Copy constructor.
//
- fLab=t.fLab;
+ Int_t i = 0;
+ Int_t j = 0;
+ UInt_t k = 0;
- fChi2=t.fChi2;
- fdEdx=t.fdEdx;
+ for (i = 0; i < kNplane; i++) {
+ for (j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = t.fdEdxPlane[i][j];
+ }
+ fTimBinPlane[i] = t.fTimBinPlane[i];
+ fTracklets[i] = t.fTracklets[i];
+ }
- fAlpha=t.fAlpha;
- fX=t.fX;
+ Int_t n = t.GetNumberOfClusters();
+ for (i = 0; i < n; i++) {
+ fIndex[i] = t.fIndex[i];
+ fIndexBackup[i] = t.fIndex[i];
+ fdQdl[i] = t.fdQdl[i];
+ }
+ for (k = n; k < kMAXCLUSTERSPERTRACK; k++) {
+ fdQdl[k] = 0;
+ fIndex[k] = 0;
+ fIndexBackup[k] = 0;
+ }
- fY=t.fY; fZ=t.fZ; fC=t.fC; fE=t.fE; fT=t.fT;
+ for (i = 0; i < 6; i++) {
+ fTracklets[i] = t.fTracklets[i];
+ }
- fCyy=t.fCyy;
- fCzy=t.fCzy; fCzz=t.fCzz;
- fCcy=t.fCcy; fCcz=t.fCcz; fCcc=t.fCcc;
- fCey=t.fCey; fCez=t.fCez; fCec=t.fCec; fCee=t.fCee;
- fCty=t.fCty; fCtz=t.fCtz; fCtc=t.fCtc; fCte=t.fCte; fCtt=t.fCtt;
+ for (i = 0; i < 3; i++) {
+ fBudget[i] = t.fBudget[i];
+ }
- fN=t.fN;
- for (Int_t i=0; i<fN; i++) fIndex[i]=t.fIndex[i];
-}
+}
//_____________________________________________________________________________
-void AliTRDtrack::GetCovariance(Double_t cc[15]) const {
- cc[0]=fCyy;
- cc[1]=fCzy; cc[2]=fCzz;
- cc[3]=fCcy; cc[4]=fCcz; cc[5]=fCcc;
- cc[6]=fCey; cc[7]=fCez; cc[8]=fCec; cc[9]=fCee;
- cc[10]=fCty; cc[11]=fCtz; cc[12]=fCtc; cc[13]=fCte; cc[14]=fCtt;
-}
+AliTRDtrack::AliTRDtrack(const AliKalmanTrack &t, Double_t alpha)
+ :AliKalmanTrack(t)
+ ,fSeedLab(-1)
+ ,fdEdx(t.GetPIDsignal())
+ ,fDE(0)
+ ,fAlpha(alpha)
+ ,fX(0)
+ ,fStopped(kFALSE)
+ ,fY(0)
+ ,fZ(0)
+ ,fE(0)
+ ,fT(0)
+ ,fC(0)
+ ,fCyy(0)
+ ,fCzy(0)
+ ,fCzz(0)
+ ,fCey(0)
+ ,fCez(0)
+ ,fCee(0)
+ ,fCty(0)
+ ,fCtz(0)
+ ,fCte(0)
+ ,fCtt(0)
+ ,fCcy(0)
+ ,fCcz(0)
+ ,fCce(0)
+ ,fCct(0)
+ ,fCcc(0)
+ ,fLhElectron(0.0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(0.0)
+ ,fBackupTrack(0x0)
+{
+ //
+ // Constructor from AliTPCtrack or AliITStrack .
+ //
+
+ Int_t i = 0;
+ Int_t j = 0;
+ UInt_t k = 0;
+
+ SetChi2(0.0);
+ SetNumberOfClusters(0);
+
+ for (i = 0; i < kNplane; i++) {
+ for (j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = 0.0;
+ }
+ fTimBinPlane[i] = -1;
+ }
+
+ if (fAlpha < -TMath::Pi()) {
+ fAlpha += 2.0 * TMath::Pi();
+ }
+ else if (fAlpha >= TMath::Pi()) {
+ fAlpha -= 2.0 * TMath::Pi();
+ }
+
+ Double_t x;
+ Double_t p[5];
+ t.GetExternalParameters(x,p);
+ fX = x;
+ fY = p[0];
+ fZ = p[1];
+ fT = p[3];
+ x = GetLocalConvConst();
+ fC = p[4] / x;
+ fE = fC * 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] - 2.0*fX*c[12] + c[ 5];
+ Double_t c32 = fX * c[13] - c[ 8];
+ Double_t c20 = fX * c[10] - c[ 3];
+ Double_t c21 = fX * c[11] - c[ 4];
+ Double_t c42 = fX * c[14] - c[12];
+
+ fCyy = c[ 0];
+ fCzy = c[ 1]; fCzz = c[ 2];
+ fCey = c20; fCez = c21; fCee = c22;
+ fCty = c[ 6]; fCtz = c[ 7]; fCte = c32; fCtt = c[ 9];
+ fCcy = c[10]; fCcz = c[11]; fCce = c42; fCct = c[13]; fCcc = c[14];
+
+ for (k = 0; k < kMAXCLUSTERSPERTRACK; k++) {
+ fdQdl[k] = 0;
+ fIndex[k] = 0;
+ fIndexBackup[k] = 0;
+ }
+
+ for (i = 0; i < 3; i++) {
+ fBudget[i] = 0;
+ }
+
+}
//_____________________________________________________________________________
-Int_t AliTRDtrack::Compare(TObject *o) {
+AliTRDtrack::AliTRDtrack(const AliESDtrack &t)
+ :AliKalmanTrack()
+ ,fSeedLab(-1)
+ ,fdEdx(t.GetTRDsignal())
+ ,fDE(0)
+ ,fAlpha(t.GetAlpha())
+ ,fX(0)
+ ,fStopped(kFALSE)
+ ,fY(0)
+ ,fZ(0)
+ ,fE(0)
+ ,fT(0)
+ ,fC(0)
+ ,fCyy(1e10)
+ ,fCzy(0)
+ ,fCzz(1e10)
+ ,fCey(0)
+ ,fCez(0)
+ ,fCee(1e10)
+ ,fCty(0)
+ ,fCtz(0)
+ ,fCte(0)
+ ,fCtt(1e10)
+ ,fCcy(0)
+ ,fCcz(0)
+ ,fCce(0)
+ ,fCct(0)
+ ,fCcc(1e10)
+ ,fLhElectron(0.0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(0.0)
+ ,fBackupTrack(0x0)
+{
+ //
+ // Constructor from AliESDtrack
+ //
+
+ Int_t i = 0;
+ Int_t j = 0;
+ UInt_t k = 0;
+
+ SetLabel(t.GetLabel());
+ SetChi2(0.);
+ SetMass(t.GetMass());
+ SetNumberOfClusters(t.GetTRDclusters(fIndex));
+
+ Int_t ncl = t.GetTRDclusters(fIndexBackup);
+ for (k = ncl; k < kMAXCLUSTERSPERTRACK; k++) {
+ fIndexBackup[k] = 0;
+ fIndex[k] = 0;
+ }
+
+ for (i = 0; i < kNplane; i++) {
+ for (j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = t.GetTRDsignals(i,j);
+ }
+ fTimBinPlane[i] = t.GetTRDTimBin(i);
+ }
+
+ if (fAlpha < -TMath::Pi()) {
+ fAlpha += 2.0 * TMath::Pi();
+ }
+ else if (fAlpha >= TMath::Pi()) {
+ fAlpha -= 2.0 * TMath::Pi();
+ }
+
+ // Conversion of the covariance matrix
+ Double_t x;
+ Double_t p[5];
+ t.GetExternalParameters(x,p);
+ Double_t c[15];
+ t.GetExternalCovariance(c);
+ if (t.GetStatus() & AliESDtrack::kTRDbackup) {
+ t.GetOuterExternalParameters(fAlpha,x,p);
+ t.GetOuterExternalCovariance(c);
+ if (fAlpha < -TMath::Pi()) {
+ fAlpha += 2.0 * TMath::Pi();
+ }
+ else if (fAlpha >= TMath::Pi()) {
+ fAlpha -= 2.0 * TMath::Pi();
+ }
+ }
+
+ fX = x;
+ fY = p[0];
+ fZ = p[1];
+ SaveLocalConvConst();
+ fT = p[3];
+ x = GetLocalConvConst();
+ fC = p[4] / x;
+ fE = fC*fX - p[2];
+
+ c[10] /= x;
+ c[11] /= x;
+ c[12] /= x;
+ c[13] /= x;
+ c[14] /= x*x;
+
+ Double_t c22 = fX*fX * c[14] - 2.0*fX*c[12] + c[ 5];
+ Double_t c32 = fX * c[13] - c[ 8];
+ Double_t c20 = fX * c[10] - c[ 3];
+ Double_t c21 = fX * c[11] - c[ 4];
+ Double_t c42 = fX * c[14] - c[12];
+
+ fCyy = c[ 0];
+ fCzy = c[ 1]; fCzz = c[ 2];
+ fCey = c20; fCez = c21; fCee = c22;
+ fCty = c[ 6]; fCtz = c[ 7]; fCte = c32; fCtt = c[ 9];
+ fCcy = c[10]; fCcz = c[11]; fCce = c42; fCct = c[13]; fCcc = c[14];
+
+ for (k = 0; k < kMAXCLUSTERSPERTRACK; k++) {
+ fdQdl[k] = 0;
+ //fIndex[k] = 0; //MI store indexes
+ }
+
+ for (i = 0; i < 3; i++) {
+ fBudget[i] = 0;
+ }
+ if ((t.GetStatus() & AliESDtrack::kTIME) == 0) {
+ return;
+ }
+
+ StartTimeIntegral();
+ Double_t times[10];
+ t.GetIntegratedTimes(times);
+ SetIntegratedTimes(times);
+ SetIntegratedLength(t.GetIntegratedLength());
-// Compares tracks according to their Y2
+}
+
+//____________________________________________________________________________
+AliTRDtrack::~AliTRDtrack()
+{
+ //
+ // Destructor
+ //
+
+ if (fBackupTrack) {
+ delete fBackupTrack;
+ }
+ fBackupTrack = 0;
+
+}
+
+//____________________________________________________________________________
+AliTRDtrack &AliTRDtrack::operator=(const AliTRDtrack &t)
+{
+ //
+ // Assignment operator
+ //
- AliTRDtrack *t=(AliTRDtrack*)o;
+ fLhElectron = 0.0;
+ fNWrong = 0;
+ fStopped = 0;
+ fNRotate = 0;
+ fNExpected = 0;
+ fNExpectedLast = 0;
+ fNdedx = 0;
+ fNCross = 0;
+ fNLast = 0;
+ fChi2Last = 0;
+ fBackupTrack = 0;
+
+ fAlpha = t.GetAlpha();
+ if (fAlpha < -TMath::Pi()) {
+ fAlpha += 2.0 * TMath::Pi();
+ }
+ else if (fAlpha >= TMath::Pi()) {
+ fAlpha -= 2.0 * TMath::Pi();
+ }
+
+ return *this;
+
+}
+
+//____________________________________________________________________________
+Float_t AliTRDtrack::StatusForTOF()
+{
+ //
+ // Defines the status of the TOF extrapolation
+ //
+
+ // Definition of res ????
+ Float_t res = (0.2 + 0.8 * (fN / (fNExpected + 5.0)))
+ * (0.4 + 0.6 * fTracklets[5].GetN() / 20.0);
+ res *= (0.25 + 0.8 * 40.0 / (40.0 + fBudget[2]));
+ return res;
+
+ // This part of the function is never reached ????
+ // What defines these parameters ????
+ Int_t status = 0;
+ if (GetNumberOfClusters() < 20) return 0;
+ if ((fN > 110) &&
+ (fChi2/(Float_t(fN)) < 3.0)) return 3; // Gold
+ if ((fNLast > 30) &&
+ (fChi2Last/(Float_t(fNLast)) < 3.0)) return 3; // Gold
+ if ((fNLast > 20) &&
+ (fChi2Last/(Float_t(fNLast)) < 2.0)) return 3; // Gold
+ if ((fNLast/(fNExpectedLast+3.0) > 0.8) &&
+ (fChi2Last/Float_t(fNLast) < 5.0) &&
+ (fNLast > 20)) return 2; // Silver
+ if ((fNLast > 5) &&
+ (((fNLast+1.0)/(fNExpectedLast+1.0)) > 0.8) &&
+ (fChi2Last/(fNLast-5.0) < 6.0)) return 1;
+
+ return status;
+
+}
+
+//_____________________________________________________________________________
+void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const
+{
+ //
+ // This function returns external representation of the covriance matrix.
+ //
+
+ Double_t a = GetLocalConvConst();
+
+ Double_t c22 = fX*fX*fCcc - 2.0*fX*fCce+fCee;
+ Double_t c32 = fX*fCct-fCte;
+ Double_t c20 = fX*fCcy-fCey;
+ Double_t c21 = fX*fCcz-fCez;
+ Double_t c42 = fX*fCcc-fCce;
+
+ cc[ 0]=fCyy;
+ cc[ 1]=fCzy; cc[ 2]=fCzz;
+ cc[ 3]=c20; cc[ 4]=c21; cc[ 5]=c22;
+ cc[ 6]=fCty; cc[ 7]=fCtz; cc[ 8]=c32; cc[ 9]=fCtt;
+ cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a;
+
+}
+
+//_____________________________________________________________________________
+void AliTRDtrack::GetCovariance(Double_t cc[15]) const
+{
+ //
+ // Returns the track covariance matrix
+ //
+
+ cc[ 0]=fCyy;
+ cc[ 1]=fCzy; cc[ 2]=fCzz;
+ cc[ 3]=fCey; cc[ 4]=fCez; cc[ 5]=fCee;
+ cc[ 6]=fCcy; cc[ 7]=fCcz; cc[ 8]=fCce; cc[ 9]=fCcc;
+ cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt;
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::Compare(const TObject *o) const
+{
+ //
+ // Compares tracks according to their Y2 or curvature
+ //
+
+ AliTRDtrack *t = (AliTRDtrack *) o;
// Double_t co=t->GetSigmaY2();
// Double_t c =GetSigmaY2();
- Double_t co=TMath::Abs(t->GetC());
- Double_t c =TMath::Abs(GetC());
+ Double_t co = TMath::Abs(t->GetC());
+ Double_t c = TMath::Abs(GetC());
- if (c>co) return 1;
- else if (c<co) return -1;
+ if (c > co) {
+ return 1;
+ }
+ else if (c < co) {
+ return -1;
+ }
return 0;
+
}
//_____________________________________________________________________________
-Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho,Double_t pm)
+void AliTRDtrack::CookdEdx(Double_t low, Double_t up)
{
- // Propagates a track of particle with mass=pm to a reference plane
- // defined by x=xk through media of density=rho and radiationLength=x0
+ //
+ // Calculates the truncated dE/dx within the "low" and "up" cuts.
+ //
- if (TMath::Abs(fC*xk - fE) >= 0.99999) {
- if (fN>4) cerr<<fN<<" AliTRDtrack warning: Propagation failed !\n";
- return 0;
+ Int_t i = 0;
+
+ // Array to sort the dEdx values according to amplitude
+ Float_t sorted[kMAXCLUSTERSPERTRACK];
+
+ // Number of clusters used for dedx
+ Int_t nc = fNdedx;
+
+ // Require at least 10 clusters for a dedx measurement
+ if (nc < 10) {
+ SetdEdx(0);
+ return;
}
- Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ;
- Double_t c1=fC*x1 - fE, r1=sqrt(1.- c1*c1);
- Double_t c2=fC*x2 - fE, r2=sqrt(1.- c2*c2);
+ // Lower and upper bound
+ Int_t nl = Int_t(low * nc);
+ Int_t nu = Int_t( up * nc);
- fY += dx*(c1+c2)/(r1+r2);
- fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT;
+ // Can fdQdl be negative ????
+ for (i = 0; i < nc; i++) {
+ sorted[i] = TMath::Abs(fdQdl[i]);
+ }
- //f = F - 1
- Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
- Double_t f02= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
- Double_t f03=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
- Double_t cr=c1*r2+c2*r1;
- Double_t f12= dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
- Double_t f13=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
- Double_t f14= dx*cc/cr;
+ // Sort the dedx values by amplitude
+ Int_t *index = new Int_t[nc];
+ TMath::Sort(nc,sorted,index,kFALSE);
- //b = C*ft
- Double_t b00=f02*fCcy + f03*fCey, b01=f12*fCcy + f13*fCey + f14*fCty;
- Double_t b10=f02*fCcz + f03*fCez, b11=f12*fCcz + f13*fCez + f14*fCtz;
- Double_t b20=f02*fCcc + f03*fCec, b21=f12*fCcc + f13*fCec + f14*fCtc;
- Double_t b30=f02*fCec + f03*fCee, b31=f12*fCec + f13*fCee + f14*fCte;
- Double_t b40=f02*fCtc + f03*fCte, b41=f12*fCtc + f13*fCte + f14*fCtt;
+ // Sum up the truncated charge between nl and nu
+ Float_t dedx = 0.0;
+ for (i = nl; i <= nu; i++) {
+ dedx += sorted[index[i]];
+ }
+ dedx /= (nu - nl + 1.0);
+ SetdEdx(dedx);
- //a = f*b = f*C*ft
- Double_t a00=f02*b20+f03*b30,a01=f02*b21+f03*b31,a11=f12*b21+f13*b31+f14*b41;
+ delete [] index;
- //F*C*Ft = C + (a + b + bt)
- fCyy += a00 + 2*b00;
- fCzy += a01 + b01 + b10;
- fCcy += b20;
- fCey += b30;
- fCty += b40;
- fCzz += a11 + 2*b11;
- fCcz += b21;
- fCez += b31;
- fCtz += b41;
+}
- fX=x2;
+//_____________________________________________________________________________
+Int_t AliTRDtrack::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 == fX) {
+ return 1;
+ }
- //Multiple scattering ******************
+ if (TMath::Abs(fC*xk - fE) >= 0.9) {
+ return 0;
+ }
- Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ));
- Double_t p2=GetPt()*GetPt()*(1.+fT*fT);
- Double_t beta2=p2/(p2 + pm*pm);
+ Double_t lcc = GetLocalConvConst();
- Double_t ey=fC*fX - fE, ez=fT;
- Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey;
+ Double_t oldX = fX;
+ Double_t oldY = fY;
+ Double_t oldZ = fZ;
- Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
- fCcc += xz*xz*theta2;
- fCec += xz*ez*xy*theta2;
- fCtc += xz*zz1*theta2;
- fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2;
- fCte += ez*zz1*xy*theta2;
- fCtt += zz1*zz1*theta2;
+ Double_t x1 = fX;
+ Double_t x2 = x1 + (xk - x1);
+ Double_t dx = x2 - x1;
+ Double_t y1 = fY;
+ Double_t z1 = fZ;
+ Double_t c1 = fC*x1 - fE;
+ if ((c1*c1) > 1) {
+ return 0;
+ }
+ Double_t r1 = TMath::Sqrt(1.0 - c1*c1);
+ Double_t c2 = fC*x2 - fE;
+ if ((c2*c2) > 1) {
+ return 0;
+ }
- //Energy losses************************
+ Double_t r2 = TMath::Sqrt(1.0 - c2*c2);
+
+ fY += dx*(c1+c2) / (r1+r2);
+ fZ += dx*(c1+c2) / (c1*r2 + c2*r1) * fT;
+
+ // f = F - 1
+ Double_t rr = r1+r2;
+ Double_t cc = c1+c2;
+ Double_t xx = x1+x2;
+ Double_t f02 = -dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
+ Double_t f04 = dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
+ Double_t cr = c1*r2+c2*r1;
+ Double_t f12 = -dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
+ Double_t f13 = dx*cc/cr;
+ Double_t f14 = dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
+
+ // b = C*ft
+ Double_t b00 = f02*fCey + f04*fCcy;
+ Double_t b01 = f12*fCey + f14*fCcy + f13*fCty;
+ Double_t b10 = f02*fCez + f04*fCcz;
+ Double_t b11 = f12*fCez + f14*fCcz + f13*fCtz;
+ Double_t b20 = f02*fCee + f04*fCce;
+ Double_t b21 = f12*fCee + f14*fCce + f13*fCte;
+ Double_t b30 = f02*fCte + f04*fCct;
+ Double_t b31 = f12*fCte + f14*fCct + f13*fCtt;
+ Double_t b40 = f02*fCce + f04*fCcc;
+ Double_t b41 = f12*fCce + f14*fCcc + f13*fCct;
+
+ // a = f*b = f*C*ft
+ Double_t a00 = f02*b20 + f04*b40;
+ Double_t a01 = f02*b21 + f04*b41;
+ Double_t a11 = f12*b21 + f14*b41 + f13*b31;
+
+ // F*C*Ft = C + (a + b + bt)
+ fCyy += a00 + 2.0*b00;
+ fCzy += a01 + b01 + b10;
+ fCey += b20;
+ fCty += b30;
+ fCcy += b40;
+ fCzz += a11 + 2.0*b11;
+ fCez += b21;
+ fCtz += b31;
+ fCcz += b41;
+
+ fX = x2;
+
+ // Change of the magnetic field
+ SaveLocalConvConst();
+ cc = fC;
+ fC *= lcc / GetLocalConvConst();
+ fE += fX * (fC-cc);
+
+ // Multiple scattering
+ // What is 14.1 ????
+ Double_t d = TMath::Sqrt((x1-fX)*(x1-fX) + (y1-fY)*(y1-fY) + (z1-fZ)*(z1-fZ));
+ Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (Get1Pt()*Get1Pt());
+ Double_t beta2 = p2 / (p2 + GetMass()*GetMass());
+ Double_t theta2 = 14.1*14.1 / (beta2*p2*1e6) * d / x0 * rho;
+ Double_t ey = fC*fX - fE;
+ Double_t ez = fT;
+ Double_t xz = fC*ez;
+ Double_t zz1 = ez*ez + 1.0;
+ Double_t xy = fE + ey;
+
+ fCee += (2.0*ey*ez*ez*fE + 1.0 - ey*ey + ez*ez + fE*fE*ez*ez) * theta2;
+ fCte += ez*zz1*xy*theta2;
+ fCtt += zz1*zz1*theta2;
+ fCce += xz*ez*xy*theta2;
+ fCct += xz*zz1*theta2;
+ fCcc += xz*xz*theta2;
- Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho;
- if (x1 < x2) dE=-dE;
- fC*=(1.- sqrt(p2+pm*pm)/p2*dE);
- //fE*=(1.- sqrt(p2+pm*pm)/p2*dE);
+ // Energy losses
+ // What is 5940.0 ???? and 0.153e-3 ????
+ if ((5940.0*beta2 / (1.0 - beta2 + 1e-10) - beta2) < 0.0) {
+ return 0;
+ }
+ Double_t dE = 0.153e-3/beta2 * (TMath::Log(5940.0*beta2 / (1.0 - beta2 + 1e-10)) - beta2)
+ * d * rho;
+ Float_t budget = d * rho;
+ fBudget[0] +=budget;
+
+ // Suspicious part - think about it ????
+ Double_t kinE = TMath::Sqrt(p2);
+ if (dE > 0.8 * kinE) {
+ dE = 0.8 * kinE;
+ }
+ if (dE < 0.0) {
+ dE = 0.0; // Not valid region for Bethe bloch
+ }
+ fDE += dE;
+ if (x1 < x2) {
+ dE = -dE;
+ }
+ cc = fC;
+ fC *= (1.0 - TMath::Sqrt(p2 + GetMass()*GetMass()) / p2 * dE);
+ fE += fX * (fC - cc);
+
+ // Energy loss fluctuation
+ // Why 0.07 ????
+ Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE));
+ Double_t sigmac2 = sigmade*sigmade * fC*fC * (p2 + GetMass()*GetMass()) / (p2*p2);
+ fCcc += sigmac2;
+ fCee += fX*fX * sigmac2;
+
+ // Track time measurement
+ if (x1 < x2) {
+ if (IsStartedTimeIntegral()) {
+ Double_t l2 = TMath::Sqrt((fX-oldX)*(fX-oldX)
+ + (fY-oldY)*(fY-oldY)
+ + (fZ-oldZ)*(fZ-oldZ));
+ if (TMath::Abs(l2*fC) > 0.0001){
+ // <ake correction for curvature if neccesary
+ l2 = 0.5 * TMath::Sqrt((fX-oldX)*(fX-oldX)
+ + (fY-oldY)*(fY-oldY));
+ l2 = 2.0 * TMath::ASin(l2 * fC) / fC;
+ l2 = TMath::Sqrt(l2*l2 + (fZ-oldZ)*(fZ-oldZ));
+ }
+ AddTimeStep(l2);
+ }
+ }
- return 1;
+ return 1;
}
-
//_____________________________________________________________________________
-void AliTRDtrack::PropagateToVertex(Double_t x0,Double_t rho,Double_t pm)
+Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq
+ , UInt_t index, Double_t h01)
{
- // This function propagates tracks to the "vertex".
+ //
+ // Assignes a found cluster to the track and updates track information
+ //
+
+ Bool_t fNoTilt = kTRUE;
+ // What is 0.003 ????
+ if (TMath::Abs(h01) > 0.003) {
+ fNoTilt = kFALSE;
+ }
+
+ // Add angular effect to the error contribution
+ Float_t tangent2 = (fC*fX-fE) * (fC*fX-fE);
+ if (tangent2 < 0.90000){
+ tangent2 = tangent2 / (1.0 - tangent2);
+ }
+ // What is 0.04 ????
+ Float_t errang = tangent2 * 0.04;
+ Float_t padlength = TMath::Sqrt(c->GetSigmaZ2() * 12.0);
+
+ Double_t r00 = c->GetSigmaY2() + errang;
+ Double_t r01 = 0.0;
+ Double_t r11 = c->GetSigmaZ2() * 100.0;
+ r00 += fCyy;
+ r01 += fCzy;
+ r11 += fCzz;
+ Double_t det = r00*r11 - r01*r01;
+ Double_t tmp = r00;
+ r00 = r11 / det;
+ r11 = tmp / det;
+ r01 = -r01 / det;
+
+ Double_t k00 = fCyy*r00 + fCzy*r01;
+ Double_t k01 = fCyy*r01 + fCzy*r11;
+ Double_t k10 = fCzy*r00 + fCzz*r01;
+ Double_t k11 = fCzy*r01 + fCzz*r11;
+ Double_t k20 = fCey*r00 + fCez*r01;
+ Double_t k21 = fCey*r01 + fCez*r11;
+ Double_t k30 = fCty*r00 + fCtz*r01;
+ Double_t k31 = fCty*r01 + fCtz*r11;
+ Double_t k40 = fCcy*r00 + fCcz*r01;
+ Double_t k41 = fCcy*r01 + fCcz*r11;
+
+ Double_t dy = c->GetY() - fY;
+ Double_t dz = c->GetZ() - fZ;
+ Double_t cur = fC + k40*dy + k41*dz;
+ Double_t eta = fE + k20*dy + k21*dz;
+
+ if (fNoTilt) {
+
+ if (TMath::Abs(cur*fX-eta) >= 0.9) {
+ return 0;
+ }
+ fY += k00*dy + k01*dz;
+ fZ += k10*dy + k11*dz;
+ fE = eta;
+ fC = cur;
- Double_t c=fC*fX - fE;
- Double_t tgf=-fE/(fC*fY + sqrt(1-c*c));
- Double_t snf=tgf/sqrt(1.+ tgf*tgf);
- Double_t xv=(fE+snf)/fC;
- PropagateTo(xv,x0,rho,pm);
-}
+ }
+ else {
+
+ // Empirical factor set by C.Xu in the first tilt version
+ // Is this factor still ok ????
+ Double_t xuFactor = 100.0;
+ dy = c->GetY() - fY;
+ dz = c->GetZ() - fZ;
+ dy = dy + h01*dz;
+
+ Float_t add = 0.0;
+ if (TMath::Abs(dz) > padlength/2.0) {
+ Float_t dy2 = c->GetY() - fY;
+ Float_t sign = (dz > 0.0) ? -1.0 : 1.0;
+ dy2 += h01 * sign * padlength/2.0;
+ dy = dy2;
+ add = 0.0;
+ }
+
+ r00 = c->GetSigmaY2() + errang + add;
+ r01 = 0.0;
+ r11 = c->GetSigmaZ2() * xuFactor;
+ r00 += (fCyy + 2.0*h01*fCzy + h01*h01*fCzz);
+ r01 += (fCzy + h01*fCzz);
+ r11 += fCzz;
+
+ det = r00*r11 - r01*r01;
+ tmp = r00;
+ r00 = r11/det;
+ r11 = tmp/det;
+ r01 = -r01/det;
+
+ k00 = fCyy*r00 + fCzy * (r01 + h01*r00);
+ k01 = fCyy*r01 + fCzy * (r11 + h01*r01);
+ k10 = fCzy*r00 + fCzz * (r01 + h01*r00);
+ k11 = fCzy*r01 + fCzz * (r11 + h01*r01);
+ k20 = fCey*r00 + fCez * (r01 + h01*r00);
+ k21 = fCey*r01 + fCez * (r11 + h01*r01);
+ k30 = fCty*r00 + fCtz * (r01 + h01*r00);
+ k31 = fCty*r01 + fCtz * (r11 + h01*r01);
+ k40 = fCcy*r00 + fCcz * (r01 + h01*r00);
+ k41 = fCcy*r01 + fCcz * (r11 + h01*r01);
+
+ cur = fC + k40*dy + k41*dz;
+ eta = fE + k20*dy + k21*dz;
+ if (TMath::Abs(cur*fX - eta) >= 0.9) {
+ return 0;
+ }
+
+ fY += k00*dy + k01*dz;
+ fZ += k10*dy + k11*dz;
+ fE = eta;
+ fT += k30*dy + k31*dz;
+ fC = cur;
+
+ k01 += h01*k00;
+ k11 += h01*k10;
+ k21 += h01*k20;
+ k31 += h01*k30;
+ k41 += h01*k40;
+
+ }
+ Double_t c01 = fCzy;
+ Double_t c02 = fCey;
+ Double_t c03 = fCty;
+ Double_t c04 = fCcy;
+ Double_t c12 = fCez;
+ Double_t c13 = fCtz;
+ Double_t c14 = fCcz;
+
+ fCyy -= k00*fCyy + k01*fCzy;
+ fCzy -= k00*c01 + k01*fCzz;
+ fCey -= k00*c02 + k01*c12;
+ fCty -= k00*c03 + k01*c13;
+ fCcy -= k00*c04 + k01*c14;
+
+ fCzz -= k10*c01 + k11*fCzz;
+ fCez -= k10*c02 + k11*c12;
+ fCtz -= k10*c03 + k11*c13;
+ fCcz -= k10*c04 + k11*c14;
+
+ fCee -= k20*c02 + k21*c12;
+ fCte -= k20*c03 + k21*c13;
+ fCce -= k20*c04 + k21*c14;
+
+ fCtt -= k30*c03 + k31*c13;
+ fCct -= k40*c03 + k41*c13;
+
+ fCcc -= k40*c04 + k41*c14;
+
+ Int_t n = GetNumberOfClusters();
+ fIndex[n] = index;
+ SetNumberOfClusters(n+1);
+
+ SetChi2(GetChi2()+chisq);
+
+ return 1;
+
+}
//_____________________________________________________________________________
-void AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index)
+Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq
+ , UInt_t index, Double_t h01
+ , Int_t /*plane*/)
{
+ //
// Assignes found cluster to the track and updates track information
+ //
- Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2()*12;
- r00+=fCyy; r01+=fCzy; r11+=fCzz;
- Double_t det=r00*r11 - r01*r01;
- Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
-
- Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
- Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
- Double_t k20=fCcy*r00+fCcz*r01, k21=fCcy*r01+fCcz*r11;
- Double_t k30=fCey*r00+fCez*r01, k31=fCey*r01+fCez*r11;
- Double_t k40=fCty*r00+fCtz*r01, k41=fCty*r01+fCtz*r11;
-
- Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
- Double_t cur=fC + k20*dy + k21*dz, eta=fE + k30*dy + k31*dz;
- if (TMath::Abs(cur*fX-eta) >= 0.99999) {
- if (fN>4) cerr<<fN<<" AliTRDtrack warning: Filtering failed !\n";
- return;
+ Bool_t fNoTilt = kTRUE;
+ if (TMath::Abs(h01) > 0.003) {
+ fNoTilt = kFALSE;
}
- fY += k00*dy + k01*dz;
- fZ += k10*dy + k11*dz;
- fC = cur;
- fE = eta;
- fT += k40*dy + k41*dz;
+ //
+ // Add angular effect to the error contribution and make correction
+ // Still needed ????
+ // AliTRDclusterCorrection *corrector = AliTRDclusterCorrection::GetCorrection();
+ //
+
+ Double_t tangent2 = (fC*fX-fE) * (fC*fX-fE);
+ if (tangent2 < 0.9) {
+ tangent2 = tangent2 / (1.0 - tangent2);
+ }
+ Double_t tangent = TMath::Sqrt(tangent2);
+ if ((fC*fX-fE) < 0.0) {
+ tangent *= -1.0;
+ }
- Double_t c01=fCzy, c02=fCcy, c03=fCey, c04=fCty;
- Double_t c12=fCcz, c13=fCez, c14=fCtz;
+ // Where are the parameters from ????
+ Double_t errang = tangent2 * 0.04;
+ Double_t errsys = 0.025*0.025 * 20.0; // Systematic error part
- fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz;
- fCcy-=k00*c02+k01*c12; fCey-=k00*c03+k01*c13;
- fCty-=k00*c04+k01*c14;
+ Float_t extend = 1.0;
+ if (c->GetNPads() == 4) extend = 2.0;
- fCzz-=k10*c01+k11*fCzz;
- fCcz-=k10*c02+k11*c12; fCez-=k10*c03+k11*c13;
- fCtz-=k10*c04+k11*c14;
+ /////////////////////////////////////////////////////////////////////////////
+ //
+ // Is this still needed or will it be needed ????
+ //
+ //if (c->GetNPads() == 5) extend = 3.0;
+ //if (c->GetNPads() == 6) extend = 3.0;
+ //if (c->GetQ() < 15) {
+ // return 1;
+ //}
+ //
+ // Will this be needed ????
+ /*
+ if (corrector !=0 ) {
+ //if (0){
+ correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent);
+ if (TMath::Abs(correction)>0){
+ //if we have info
+ errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent);
+ errang *= errang;
+ errang += tangent2*0.04;
+ }
+ }
+ */
+ //
+ // Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.);
+ /////////////////////////////////////////////////////////////////////////////
+
+ Double_t r00 = (c->GetSigmaY2() + errang + errsys) * extend;
+ Double_t r01 = 0.0;
+ Double_t r11 = c->GetSigmaZ2()*10000.0;
+ r00 += fCyy;
+ r01 += fCzy;
+ r11 += fCzz;
+ Double_t det =r00*r11 - r01*r01;
+ Double_t tmp =r00;
+ r00 = r11 / det;
+ r11 = tmp / det;
+ r01 = -r01 / det;
+
+ Double_t k00 = fCyy*r00 + fCzy*r01;
+ Double_t k01 = fCyy*r01 + fCzy*r11;
+ Double_t k10 = fCzy*r00 + fCzz*r01;
+ Double_t k11 = fCzy*r01 + fCzz*r11;
+ Double_t k20 = fCey*r00 + fCez*r01;
+ Double_t k21 = fCey*r01 + fCez*r11;
+ Double_t k30 = fCty*r00 + fCtz*r01;
+ Double_t k31 = fCty*r01 + fCtz*r11;
+ Double_t k40 = fCcy*r00 + fCcz*r01;
+ Double_t k41 = fCcy*r01 + fCcz*r11;
+
+ Double_t dy = c->GetY() - fY;
+ Double_t dz = c->GetZ() - fZ;
+ Double_t cur = fC + k40*dy + k41*dz;
+ Double_t eta = fE + k20*dy + k21*dz;
+
+ if (fNoTilt) {
+
+ if (TMath::Abs(cur*fX - eta) >= 0.9) {
+ return 0;
+ }
- fCcc-=k20*c02+k21*c12; fCec-=k20*c03+k21*c13;
- fCtc-=k20*c04+k21*c14;
+ fY += k00*dy + k01*dz;
+ fZ += k10*dy + k11*dz;
+ fE = eta;
+ fC = cur;
- fCee-=k30*c03+k31*c13;
- fCte-=k30*c04+k31*c14;
+ }
+ else {
+
+ Double_t padlength = TMath::Sqrt(c->GetSigmaZ2() * 12.0);
+ // Empirical factor set by C.Xu in the first tilt version
+ Double_t xuFactor = 1000.0;
+
+ dy = c->GetY() - fY;
+ dz = c->GetZ() - fZ;
+ //dy = dy + h01*dz + correction; // Still needed ????
+
+ Double_t tiltdz = dz;
+ if (TMath::Abs(tiltdz) > padlength/2.0) {
+ tiltdz = TMath::Sign(padlength/2.0,dz);
+ }
+ dy = dy + h01*tiltdz;
+
+ Double_t add = 0.0;
+ if (TMath::Abs(dz) > padlength/2.0) {
+ //Double_t dy2 = c->GetY() - fY; // Still needed ????
+ //Double_t sign = (dz>0) ? -1.: 1.;
+ //dy2-=h01*sign*padlength/2.;
+ //dy = dy2;
+ add = 1.0;
+ }
- fCtt-=k40*c04+k41*c14;
+ Double_t s00 = (c->GetSigmaY2() + errang) * extend + errsys + add; // Error pad
+ Double_t s11 = c->GetSigmaZ2() * xuFactor; // Error pad-row
+ //
+ r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01 + s00;
+ r01 = fCzy + fCzz*h01;
+ r11 = fCzz + s11;
+ det = r00*r11 - r01*r01;
+
+ // Inverse matrix
+ tmp = r00;
+ r00 = r11 / det;
+ r11 = tmp / det;
+ r01 = -r01 / det;
+
+ // K matrix
+ k00 = fCyy*r00 + fCzy * (r01 + h01*r00);
+ k01 = fCyy*r01 + fCzy * (r11 + h01*r01);
+ k10 = fCzy*r00 + fCzz * (r01 + h01*r00);
+ k11 = fCzy*r01 + fCzz * (r11 + h01*r01);
+ k20 = fCey*r00 + fCez * (r01 + h01*r00);
+ k21 = fCey*r01 + fCez * (r11 + h01*r01);
+ k30 = fCty*r00 + fCtz * (r01 + h01*r00);
+ k31 = fCty*r01 + fCtz * (r11 + h01*r01);
+ k40 = fCcy*r00 + fCcz * (r01 + h01*r00);
+ k41 = fCcy*r01 + fCcz * (r11 + h01*r01);
+
+ // Update measurement
+ cur = fC + k40*dy + k41*dz;
+ eta = fE + k20*dy + k21*dz;
+ if (TMath::Abs(cur*fX - eta) >= 0.9) {
+ return 0;
+ }
+ fY += k00*dy + k01*dz;
+ fZ += k10*dy + k11*dz;
+ fE = eta;
+ fT += k30*dy + k31*dz;
+ fC = cur;
+
+ k01 += h01*k00;
+ k11 += h01*k10;
+ k21 += h01*k20;
+ k31 += h01*k30;
+ k41 += h01*k40;
+
+ }
- fIndex[fN++]=index;
- fChi2 += chisq;
+ // Update the covariance matrix
+ Double_t oldyy = fCyy;
+ Double_t oldzz = fCzz;
+ //Double_t oldee = fCee;
+ //Double_t oldcc = fCcc;
+ Double_t oldzy = fCzy;
+ Double_t oldey = fCey;
+ Double_t oldty = fCty;
+ Double_t oldcy = fCcy;
+ Double_t oldez = fCez;
+ Double_t oldtz = fCtz;
+ Double_t oldcz = fCcz;
+ //Double_t oldte = fCte;
+ //Double_t oldce = fCce;
+ //Double_t oldct = fCct;
+
+ fCyy -= k00*oldyy + k01*oldzy;
+ fCzy -= k10*oldyy + k11*oldzy;
+ fCey -= k20*oldyy + k21*oldzy;
+ fCty -= k30*oldyy + k31*oldzy;
+ fCcy -= k40*oldyy + k41*oldzy;
+
+ fCzz -= k10*oldzy + k11*oldzz;
+ fCez -= k20*oldzy + k21*oldzz;
+ fCtz -= k30*oldzy + k31*oldzz;
+ fCcz -= k40*oldzy + k41*oldzz;
+
+ fCee -= k20*oldey + k21*oldez;
+ fCte -= k30*oldey + k31*oldez;
+ fCce -= k40*oldey + k41*oldez;
+
+ fCtt -= k30*oldty + k31*oldtz;
+ fCct -= k40*oldty + k41*oldtz;
+
+ fCcc -= k40*oldcy + k41*oldcz;
+
+ Int_t n = GetNumberOfClusters();
+ fIndex[n] = index;
+ SetNumberOfClusters(n+1);
+
+ SetChi2(GetChi2() + chisq);
+
+ return 1;
- // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
}
//_____________________________________________________________________________
-Int_t AliTRDtrack::Rotate(Double_t alpha)
+Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet)
{
- // Rotates track parameters in R*phi plane
+ //
+ // Assignes found tracklet to the track and updates track information
+ //
+
+ Double_t r00 = (tracklet.GetTrackletSigma2());
+ Double_t r01 = 0.0;
+ Double_t r11 = 10000.0;
+ r00 += fCyy;
+ r01 += fCzy;
+ r11 += fCzz;
+
+ Double_t det = r00*r11 - r01*r01;
+ Double_t tmp = r00;
+ r00 = r11 / det;
+ r11 = tmp / det;
+ r01 = -r01 / det;
+
+ Double_t dy = tracklet.GetY() - fY;
+ Double_t dz = tracklet.GetZ() - fZ;
+
+ Double_t s00 = tracklet.GetTrackletSigma2(); // Error pad
+ Double_t s11 = 100000.0; // Error pad-row
+ Float_t h01 = tracklet.GetTilt();
+
+ r00 = fCyy + fCzz*h01*h01 + s00;
+ r01 = fCzy;
+ r11 = fCzz + s11;
+ det = r00*r11 - r01*r01;
+
+ // Inverse matrix
+ tmp = r00;
+ r00 = r11 / det;
+ r11 = tmp / det;
+ r01 = -r01 / det;
+
+ // K matrix
+ Double_t k00 = fCyy*r00 + fCzy*r01;
+ Double_t k01 = fCyy*r01 + fCzy*r11;
+ Double_t k10 = fCzy*r00 + fCzz*r01;
+ Double_t k11 = fCzy*r01 + fCzz*r11;
+ Double_t k20 = fCey*r00 + fCez*r01;
+ Double_t k21 = fCey*r01 + fCez*r11;
+ Double_t k30 = fCty*r00 + fCtz*r01;
+ Double_t k31 = fCty*r01 + fCtz*r11;
+ Double_t k40 = fCcy*r00 + fCcz*r01;
+ Double_t k41 = fCcy*r01 + fCcz*r11;
+
+ // Update measurement
+ Double_t cur = fC + k40*dy + k41*dz;
+ Double_t eta = fE + k20*dy + k21*dz;
+ if (TMath::Abs(cur*fX-eta) >= 0.9) {
+ return 0;
+ }
- fAlpha += alpha;
+ fY += k00*dy + k01*dz;
+ fZ += k10*dy + k11*dz;
+ fE = eta;
+ fT += k30*dy + k31*dz;
+ fC = cur;
+
+ // Update the covariance matrix
+ Double_t oldyy = fCyy;
+ Double_t oldzz = fCzz;
+ //Double_t oldee = fCee;
+ //Double_t oldcc = fCcc;
+ Double_t oldzy = fCzy;
+ Double_t oldey = fCey;
+ Double_t oldty = fCty;
+ Double_t oldcy = fCcy;
+ Double_t oldez = fCez;
+ Double_t oldtz = fCtz;
+ Double_t oldcz = fCcz;
+ //Double_t oldte = fCte;
+ //Double_t oldce = fCce;
+ //Double_t oldct = fCct;
+
+ fCyy -= k00*oldyy + k01*oldzy;
+ fCzy -= k10*oldyy + k11*oldzy;
+ fCey -= k20*oldyy + k21*oldzy;
+ fCty -= k30*oldyy + k31*oldzy;
+ fCcy -= k40*oldyy + k41*oldzy;
+
+ fCzz -= k10*oldzy + k11*oldzz;
+ fCez -= k20*oldzy + k21*oldzz;
+ fCtz -= k30*oldzy + k31*oldzz;
+ fCcz -= k40*oldzy + k41*oldzz;
+
+ fCee -= k20*oldey + k21*oldez;
+ fCte -= k30*oldey + k31*oldez;
+ fCce -= k40*oldey + k41*oldez;
+
+ fCtt -= k30*oldty + k31*oldtz;
+ fCct -= k40*oldty + k41*oldtz;
+
+ fCcc -= k40*oldcy + k41*oldcz;
+
+ return 1;
- Double_t x1=fX, y1=fY;
- Double_t ca=cos(alpha), sa=sin(alpha);
- Double_t r1=fC*fX - fE;
+}
- fX = x1*ca + y1*sa;
- fY=-x1*sa + y1*ca;
- fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa;
+//_____________________________________________________________________________
+Int_t AliTRDtrack::Rotate(Double_t alpha, Bool_t absolute)
+{
+ //
+ // Rotates the track parameters in the R*phi plane,
+ // if the absolute rotation alpha is in global system.
+ // Otherwise the rotation is relative to the current rotation angle
+ //
- Double_t r2=fC*fX - fE;
- if (TMath::Abs(r2) >= 0.99999) {
- if (fN>4) cerr<<fN<<" AliTRDtrack warning: Rotation failed !\n";
- return 0;
+ if (absolute) {
+ alpha -= fAlpha;
+ }
+ else{
+ fNRotate++;
}
- Double_t y0=fY + sqrt(1.- r2*r2)/fC;
- if ((fY-y0)*fC >= 0.) {
- if (fN>4) cerr<<fN<<" AliTRDtrack warning: Rotation failed !!!\n";
- return 0;
+ fAlpha += alpha;
+ if (fAlpha < -TMath::Pi()) {
+ fAlpha += 2.0 * TMath::Pi();
+ }
+ if (fAlpha >= TMath::Pi()) {
+ fAlpha -= 2.0 * TMath::Pi();
}
- //f = F - 1
- Double_t f00=ca-1, f32=(y1 - r1*x1/sqrt(1.- r1*r1))*sa,
- f30=fC*sa, f33=(ca + sa*r1/sqrt(1.- r1*r1))-1;
+ Double_t x1 = fX;
+ Double_t y1 = fY;
+ Double_t ca = TMath::Cos(alpha);
+ Double_t sa = TMath::Sin(alpha);
+ Double_t r1 = fC*fX - fE;
- //b = C*ft
- Double_t b00=fCyy*f00, b03=fCyy*f30+fCcy*f32+fCey*f33;
- Double_t b10=fCzy*f00, b13=fCzy*f30+fCcz*f32+fCez*f33;
- Double_t b20=fCcy*f00, b23=fCcy*f30+fCcc*f32+fCec*f33;
- Double_t b30=fCey*f00, b33=fCey*f30+fCec*f32+fCee*f33;
- Double_t b40=fCty*f00, b43=fCty*f30+fCtc*f32+fCte*f33;
+ fX = x1*ca + y1*sa;
+ fY = -x1*sa + y1*ca;
+ if ((r1*r1) > 1.0) {
+ return 0;
+ }
+ fE = fE*ca + (fC*y1 + TMath::Sqrt(1.0 - r1*r1)) * sa;
- //a = f*b = f*C*ft
- Double_t a00=f00*b00, a03=f00*b03, a33=f30*b03+f32*b23+f33*b33;
+ Double_t r2 = fC*fX - fE;
+ if (TMath::Abs(r2) >= 0.9) {
+ Int_t n = GetNumberOfClusters();
+ if (n > 4) {
+ AliError(Form("Rotation failed N = %d !\n",n));
+ }
+ return 0;
+ }
- // *** Double_t dy2=fCyy;
-
- //F*C*Ft = C + (a + b + bt)
- fCyy += a00 + 2*b00;
+ if ((r2*r2) > 1.0) {
+ return 0;
+ }
+ Double_t y0 = fY + TMath::Sqrt(1.0 - r2*r2) / fC;
+ if ((fY-y0)*fC >= 0.0) {
+ Int_t n = GetNumberOfClusters();
+ if (n > 4) {
+ AliError(Form("Rotation failed N = %d !\n",n));
+ }
+ return 0;
+ }
+
+ // f = F - 1
+ Double_t f00 = ca-1.0;
+ Double_t f24 = (y1 - r1*x1/TMath::Sqrt(1.0 - r1*r1)) * sa;
+ Double_t f20 = fC*sa;
+ Double_t f22 = (ca + sa*r1/TMath::Sqrt(1.0 - r1*r1)) - 1.0;
+
+ // b = C*ft
+ Double_t b00 = fCyy*f00;
+ Double_t b02 = fCyy*f20 + fCcy*f24 + fCey*f22;
+ Double_t b10 = fCzy*f00;
+ Double_t b12 = fCzy*f20 + fCcz*f24 + fCez*f22;
+ Double_t b20 = fCey*f00;
+ Double_t b22 = fCey*f20 + fCce*f24 + fCee*f22;
+ Double_t b30 = fCty*f00;
+ Double_t b32 = fCty*f20 + fCct*f24 + fCte*f22;
+ Double_t b40 = fCcy*f00;
+ Double_t b42 = fCcy*f20 + fCcc*f24 + fCce*f22;
+
+ // a = f*b = f*C*ft
+ Double_t a00 = f00*b00;
+ Double_t a02 = f00*b02;
+ Double_t a22 = f20*b02 + f24*b42 + f22*b22;
+
+ // F*C*Ft = C + (a + b + bt)
+ fCyy += a00 + 2.0*b00;
fCzy += b10;
- fCcy += b20;
- fCey += a03+b30+b03;
- fCty += b40;
- fCez += b13;
- fCec += b23;
- fCee += a33 + 2*b33;
- fCte += b43;
+ fCey += a02 + b20 + b02;
+ fCty += b30;
+ fCcy += b40;
+ fCez += b12;
+ fCte += b32;
+ fCee += a22 + 2.0*b22;
+ fCce += b42;
- // *** fCyy+=dy2*sa*sa*r1*r1/(1.- r1*r1);
- // *** fCzz+=d2y*sa*sa*fT*fT/(1.- r1*r1);
+ return 1;
- return 1;
}
+//_____________________________________________________________________________
+Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const
+{
+ //
+ // Returns the track chi2
+ //
+
+ Bool_t fNoTilt = kTRUE;
+ if (TMath::Abs(h01) > 0.003) {
+ fNoTilt = kFALSE;
+ }
+ Double_t chi2;
+ Double_t dy;
+ Double_t r00;
+ Double_t r01;
+ Double_t r11;
+ if (fNoTilt) {
-//_____________________________________________________________________________
-Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c) const
-{
- Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2()*12;
- r00+=fCyy; r01+=fCzy; r11+=fCzz;
+ dy = c->GetY() - fY;
+ r00 = c->GetSigmaY2();
+ chi2 = (dy*dy) / r00;
- Double_t det=r00*r11 - r01*r01;
- if (TMath::Abs(det) < 1.e-10) {
- if (fN>4) cerr<<fN<<" AliTRDtrack warning: Singular matrix !\n";
- return 1e10;
}
- Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01;
+ else {
+
+ Double_t padlength = TMath::Sqrt(c->GetSigmaZ2() * 12.0);
+
+ r00 = c->GetSigmaY2();
+ r01 = 0.0;
+ r11 = c->GetSigmaZ2();
+ r00 += fCyy;
+ r01 += fCzy;
+ r11 += fCzz;
+
+ Double_t det = r00*r11 - r01*r01;
+ if (TMath::Abs(det) < 1.e-10) {
+ Int_t n = GetNumberOfClusters();
+ if (n > 4) {
+ AliError(Form("Singular matrix N = %d!\n",n));
+ }
+ return 1e10;
+ }
+
+ Double_t tmp = r00;
+ r00 = r11;
+ r11 = tmp;
+ r01 = -r01;
+ Double_t dy = c->GetY() - fY;
+ Double_t dz = c->GetZ() - fZ;
+ Double_t tiltdz = dz;
+ if (TMath::Abs(tiltdz) > padlength/2.0) {
+ tiltdz = TMath::Sign(padlength/2.0,dz);
+ }
+ dy = dy + h01*tiltdz;
- Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
+ chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz) / det;
- return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
-}
+ }
+
+ return chi2;
+}
//_________________________________________________________________________
void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
{
+ //
// Returns reconstructed track momentum in the global system.
+ //
+
+ Double_t pt = TMath::Abs(GetPt());
+ Double_t r = fC*fX - fE;
+
+ Double_t y0;
+ if (r > 1) {
+ py = pt;
+ px = 0.0;
+ }
+ else if (r < -1) {
+ py = -pt;
+ px = 0.0;
+ }
+ else {
+ y0 = fY + TMath::Sqrt(1.0 - r*r) / fC;
+ px = -pt * (fY - y0) * fC; //cos(phi);
+ py = -pt * (fE - fX*fC); //sin(phi);
+ }
- Double_t pt=TMath::Abs(GetPt()); // GeV/c
- Double_t r=fC*fX-fE;
- Double_t y0=fY + sqrt(1.- r*r)/fC;
- px=-pt*(fY-y0)*fC; //cos(phi);
- py=-pt*(fE-fX*fC); //sin(phi);
- pz=pt*fT;
- Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha);
- py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha);
- px=tmp;
+ pz = pt*fT;
+ Double_t tmp = px * TMath::Cos(fAlpha)
+ - py * TMath::Sin(fAlpha);
+ py = px * TMath::Sin(fAlpha)
+ + py * TMath::Cos(fAlpha);
+ px = tmp;
}
-//____________________________________________________________________________
-void AliTRDtrack::Streamer(TBuffer &R__b)
+//_________________________________________________________________________
+void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const
+{
+ //
+ // Returns reconstructed track coordinates in the global system.
+ //
+
+ x = fX;
+ y = fY;
+ z = fZ
+;
+ Double_t tmp = x * TMath::Cos(fAlpha)
+ - y * TMath::Sin(fAlpha);
+ y = x * TMath::Sin(fAlpha)
+ + y * TMath::Cos(fAlpha);
+ x = tmp;
+
+}
+
+//_________________________________________________________________________
+void AliTRDtrack::ResetCovariance()
{
- if (R__b.IsReading()) {
- Version_t R__v = R__b.ReadVersion(); if (R__v) { }
- TObject::Streamer(R__b);
- R__b >> fLab;
- R__b >> fChi2;
- R__b >> fdEdx;
- R__b >> fAlpha;
- R__b >> fX;
- R__b >> fY;
- R__b >> fZ;
- R__b >> fC;
- R__b >> fE;
- R__b >> fT;
- R__b >> fCyy;
- R__b >> fCzy;
- R__b >> fCzz;
- R__b >> fCcy;
- R__b >> fCcz;
- R__b >> fCcc;
- R__b >> fCey;
- R__b >> fCez;
- R__b >> fCec;
- R__b >> fCee;
- R__b >> fCty;
- R__b >> fCtz;
- R__b >> fCtc;
- R__b >> fCte;
- R__b >> fCtt;
- R__b >> fN;
- for (Int_t i=0; i<fN; i++) R__b >> fIndex[i];
- } else {
- R__b.WriteVersion(AliTRDtrack::IsA());
- TObject::Streamer(R__b);
- R__b << fLab;
- R__b << fChi2;
- R__b << fdEdx;
- R__b << fAlpha;
- R__b << fX;
- R__b << fY;
- R__b << fZ;
- R__b << fC;
- R__b << fE;
- R__b << fT;
- R__b << fCyy;
- R__b << fCzy;
- R__b << fCzz;
- R__b << fCcy;
- R__b << fCcz;
- R__b << fCcc;
- R__b << fCey;
- R__b << fCez;
- R__b << fCec;
- R__b << fCee;
- R__b << fCty;
- R__b << fCtz;
- R__b << fCtc;
- R__b << fCte;
- R__b << fCtt;
- R__b << fN;
- for (Int_t i=0; i<fN; i++) R__b << fIndex[i];
- }
-}
+ //
+ // Resets covariance matrix
+ //
+
+ fCyy *= 10.0;
+ fCzy = 0.0; fCzz *= 10.0;
+ fCey = 0.0; fCez = 0.0; fCee *= 10.0;
+ fCty = 0.0; fCtz = 0.0; fCte = 0.0; fCtt *= 10.0;
+ fCcy = 0.0; fCcz = 0.0; fCce = 0.0; fCct = 0.0; fCcc *= 10.0;
+
+}
//_____________________________________________________________________________
-void AliTRDseed::CookdEdx(Double_t low, Double_t up) {
+void AliTRDtrack::ResetCovariance(Float_t mult)
+{
+ //
+ // Resets covariance matrix
+ //
- // Calculates dE/dX within the "low" and "up" cuts.
+ fCyy *= mult;
+ fCzy *= 0.0; fCzz *= 1.0;
+ fCey *= 0.0; fCez *= 0.0; fCee *= mult;
+ fCty *= 0.0; fCtz *= 0.0; fCte *= 0.0; fCtt *= 1.0;
+ fCcy *= 0.0; fCcz *= 0.0; fCce *= 0.0; fCct *= 0.0; fCcc *= mult;
- Int_t i;
- Int_t nc=this->GetNclusters();
+}
- Int_t swap;//stupid sorting
- do {
- swap=0;
- for (i=0; i<nc-1; i++) {
- if (fdEdx[i]<=fdEdx[i+1]) continue;
- Float_t tmp=fdEdx[i]; fdEdx[i]=fdEdx[i+1]; fdEdx[i+1]=tmp;
- swap++;
+//_____________________________________________________________________________
+void AliTRDtrack::MakeBackupTrack()
+{
+ //
+ // Creates a backup track
+ //
+
+ if (fBackupTrack) {
+ delete fBackupTrack;
+ }
+
+ fBackupTrack = new AliTRDtrack(*this);
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z)
+{
+ //
+ // Find prolongation at given x
+ // Return 0 if it does not exist
+ //
+
+ Double_t c1 = fC*fX - fE;
+ if (TMath::Abs(c1) > 1.0) {
+ return 0;
+ }
+
+ Double_t r1 = TMath::Sqrt(1.0 - c1*c1);
+ Double_t c2 = fC*xk - fE;
+ if (TMath::Abs(c2) > 1.0) {
+ return 0;
+ }
+
+ Double_t r2 = TMath::Sqrt(1.0 - c2*c2);
+ y = fY + (xk-fX)*(c1+c2)/(r1+r2);
+ z = fZ + (xk-fX)*(c1+c2)/(c1*r2 + c2*r1)*fT;
+
+ return 1;
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::PropagateToX(Double_t xr, Double_t step)
+{
+ //
+ // Propagate track to a given x position
+ // Works inside of the 20 degree segmentation
+ // (local cooordinate frame for TRD , TPC, TOF)
+ //
+ // The material budget is taken from the geo manager
+ //
+
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t y;
+ Double_t z;
+
+ // Critical alpha - cross sector indication
+ const Double_t kAlphac = TMath::Pi()/9.0;
+ const Double_t kTalphac = TMath::Tan(kAlphac*0.5);
+
+ // Direction +-
+ Double_t dir = (fX > xr) ? -1.0 : 1.0;
+
+ for (Double_t x = fX + dir*step; dir*x < dir*xr; x += dir*step) {
+
+ GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
+ GetProlongation(x,y,z);
+ xyz1[0] = x * TMath::Cos(fAlpha) + y * TMath::Sin(fAlpha);
+ xyz1[1] = x * TMath::Sin(fAlpha) - y * TMath::Cos(fAlpha);
+ xyz1[2] = z;
+ Double_t param[7];
+ AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
+
+ if ((param[0] > 0) &&
+ (param[1] > 0)) {
+ PropagateTo(x,param[1],param[0]);
+ }
+ if (fY > fX*kTalphac) {
+ Rotate(-kAlphac);
+ }
+ if (fY < -fX*kTalphac) {
+ Rotate(kAlphac);
}
- } while (swap);
- Int_t nl=Int_t(low*nc), nu=Int_t(up*nc);
- Float_t dedx=0;
- for (i=nl; i<=nu; i++) dedx += fdEdx[i];
- dedx /= (nu-nl+1);
- SetdEdx(dedx);
+ }
+
+ PropagateTo(xr);
+
+ return 0;
+
}
+//_____________________________________________________________________________
+Int_t AliTRDtrack::PropagateToR(Double_t r,Double_t step)
+{
+ //
+ // Propagate a track to a given radial position
+ // The rotation is always connected to the last track position
+ //
+
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t y;
+ Double_t z;
+
+ // Direction +-
+ Double_t radius = TMath::Sqrt(fX*fX + fY*fY);
+ Double_t dir = (radius > r) ? -1.0 : 1.0;
+
+ for (Double_t x = radius + dir*step; dir*x < dir*r; x += dir*step) {
+ GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
+ Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
+ Rotate(alpha,kTRUE);
+ GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
+ GetProlongation(x,y,z);
+ xyz1[0] = x * TMath::Cos(alpha) + y * TMath::Sin(alpha);
+ xyz1[1] = x * TMath::Sin(alpha) - y * TMath::Cos(alpha);
+ xyz1[2] = z;
+ Double_t param[7];
+ AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
+ if (param[1] <= 0.0) {
+ param[1] = 100000000.0;
+ }
+ PropagateTo(x,param[1],param[0]);
+ }
+
+ GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
+ Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
+ Rotate(alpha,kTRUE);
+ GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
+ GetProlongation(r,y,z);
+ xyz1[0] = r * TMath::Cos(alpha) + y * TMath::Sin(alpha);
+ xyz1[1] = r * TMath::Sin(alpha) - y * TMath::Cos(alpha);
+ xyz1[2] = z;
+ Double_t param[7];
+ AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
+
+ if (param[1] <= 0.0) {
+ param[1] = 100000000.0;
+ }
+ PropagateTo(r,param[1],param[0]);
+
+ return 0;
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::GetSector() const
+{
+ //
+ // Return the current sector
+ //
+
+ return Int_t(TVector2::Phi_0_2pi(fAlpha)
+ / AliTRDgeometry::GetAlpha())
+ % AliTRDgeometry::kNsect;
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrack::Get1Pt() const
+{
+ //
+ // Returns the inverse Pt (1/GeV/c)
+ // (or 1/"most probable pt", if the field is too weak)
+ //
+
+ if (TMath::Abs(GetLocalConvConst()) > kVeryBigConvConst) {
+ return 1.0 / kMostProbableMomentum
+ / TMath::Sqrt(1.0 + GetTgl()*GetTgl());
+ }
+
+ return (TMath::Sign(1.0e-9,fC) + fC) * GetLocalConvConst();
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrack::GetP() const
+{
+ //
+ // Returns the total momentum
+ //
+
+ return TMath::Abs(GetPt()) * TMath::Sqrt(1.0 + GetTgl()*GetTgl());
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrack::GetYat(Double_t xk) 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 c1 = fC*fX - fE;
+ Double_t r1 = TMath::Sqrt(1.0 - c1*c1);
+ Double_t c2 = fC*xk - fE;
+ Double_t r2 = TMath::Sqrt(1.0- c2*c2);
+
+ return fY + (xk-fX)*(c1+c2)/(r1+r2);
+
+}
+
+//_____________________________________________________________________________
+void AliTRDtrack::SetSampledEdx(Float_t q, Int_t i)
+{
+ //
+ // The sampled energy loss
+ //
+
+ Double_t s = GetSnp();
+ Double_t t = GetTgl();
+
+ q *= TMath::Sqrt((1.0 - s*s) / (1.0 + t*t));
+ fdQdl[i] = q;
+
+}
+
+ //_____________________________________________________________________________
+void AliTRDtrack::SetSampledEdx(Float_t q)
+{
+ //
+ // The sampled energy loss
+ //
+
+ Double_t s = GetSnp();
+ Double_t t = GetTgl();
+
+ q*= TMath::Sqrt((1.0 - s*s) / (1.0 + t*t));
+ fdQdl[fNdedx] = q;
+ fNdedx++;
+
+}
+
+//_____________________________________________________________________________
+void AliTRDtrack::GetXYZ(Float_t r[3]) const
+{
+ //
+ // Returns the position of the track in the global coord. system
+ //
+
+ Double_t cs = TMath::Cos(fAlpha);
+ Double_t sn = TMath::Sin(fAlpha);
+ r[0] = fX*cs - fY*sn;
+ r[1] = fX*sn + fY*cs;
+ r[2] = fZ;
+
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff