* 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 "AliTracker.h"
+#include "AliESDtrack.h"
-#include <TObject.h>
-
-#include "AliTRD.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)
+ ,fStopped(kFALSE)
+ ,fLhElectron(0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(1e10)
+ ,fBackupTrack(0x0)
+{
+ //
+ // AliTRDtrack default constructor
+ //
-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.;
+ for (Int_t i = 0; i < kNplane; i++) {
+ for (Int_t j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = 0.0;
+ }
+ fTimBinPlane[i] = -1;
+ }
- fAlpha=alpha;
- fX=xref;
+ for (UInt_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
+ fIndex[i] = 0;
+ fIndexBackup[i] = 0;
+ fdQdl[i] = 0;
+ }
- fY=xx[0]; fZ=xx[1]; fC=xx[2]; fE=xx[3]; fT=xx[4];
+ for (Int_t i = 0; i < 3; i++) {
+ fBudget[i] = 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];
+}
+
+//_____________________________________________________________________________
+AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, Int_t index
+ , const Double_t p[5], const Double_t cov[15]
+ , Double_t x, Double_t alpha)
+ :AliKalmanTrack()
+ ,fSeedLab(-1)
+ ,fdEdx(0)
+ ,fDE(0)
+ ,fStopped(kFALSE)
+ ,fLhElectron(0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(1e10)
+ ,fBackupTrack(0x0)
+{
+ //
+ // The main AliTRDtrack constructor.
+ //
+
+ Double_t cnv = 1.0/(GetBz() * kB2C);
+
+ Double_t pp[5] = { p[0]
+ , p[1]
+ , x*p[4] - p[2]
+ , p[3]
+ , p[4]*cnv };
+
+ Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[5];
+ Double_t c32 = x*cov[13] - cov[8];
+ Double_t c20 = x*cov[10] - cov[3];
+ Double_t c21 = x*cov[11] - cov[4];
+ Double_t c42 = x*cov[14] - cov[12];
+
+ Double_t cc[15] = { cov[0 ]
+ , cov[1 ], cov[2 ]
+ , c20, c21, c22
+ , cov[6 ], cov[7 ], c32, cov[9 ]
+ , cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv };
+
+ Set(x,alpha,pp,cc);
+ SetNumberOfClusters(1);
+ fIndex[0] = index;
+
+ for (Int_t i = 0; i < kNplane; i++) {
+ for (Int_t j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = 0.0;
+ }
+ fTimBinPlane[i] = -1;
+ }
+
+ Double_t q = TMath::Abs(c->GetQ());
+ Double_t s = GetSnp();
+ Double_t t = GetTgl();
+ if (s*s < 1) {
+ q *= TMath::Sqrt((1-s*s)/(1+t*t));
+ }
+
+ fdQdl[0] = q;
+
+ for (UInt_t i = 1; i < kMAXCLUSTERSPERTRACK; i++) {
+ fdQdl[i] = 0;
+ fIndex[i] = 0;
+ fIndexBackup[i] = 0;
+ }
+
+ for (Int_t 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.GetSeedLabel())
+ ,fdEdx(t.fdEdx)
+ ,fDE(t.fDE)
+ ,fStopped(t.fStopped)
+ ,fLhElectron(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;
+ for (Int_t i = 0; i < kNplane; i++) {
+ for (Int_t j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = t.fdEdxPlane[i][j];
+ }
+ fTimBinPlane[i] = t.fTimBinPlane[i];
+ fTracklets[i] = t.fTracklets[i];
+ }
- fChi2=t.fChi2;
- fdEdx=t.fdEdx;
+ Int_t n = t.GetNumberOfClusters();
+ SetNumberOfClusters(n);
- fAlpha=t.fAlpha;
- fX=t.fX;
+ for (Int_t i = 0; i < n; i++) {
+ fIndex[i] = t.fIndex[i];
+ fIndexBackup[i] = t.fIndex[i];
+ fdQdl[i] = t.fdQdl[i];
+ }
- fY=t.fY; fZ=t.fZ; fC=t.fC; fE=t.fE; fT=t.fT;
+ for (UInt_t i = n; i < kMAXCLUSTERSPERTRACK; i++) {
+ fdQdl[i] = 0;
+ fIndex[i] = 0;
+ fIndexBackup[i] = 0;
+ }
- 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 (Int_t 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)
+ ,fStopped(kFALSE)
+ ,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
+ //
+
+ SetLabel(t.GetLabel());
+ SetChi2(0.0);
+ SetMass(t.GetMass());
+ SetNumberOfClusters(0);
+
+ for (Int_t i = 0; i < kNplane; i++) {
+ for (Int_t j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = 0.0;
+ }
+ fTimBinPlane[i] = -1;
+ }
+
+ for (UInt_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
+ fdQdl[i] = 0;
+ fIndex[i] = 0;
+ fIndexBackup[i] = 0;
+ }
+
+ for (Int_t 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)
+ ,fStopped(kFALSE)
+ ,fLhElectron(0)
+ ,fNWrong(0)
+ ,fNRotate(0)
+ ,fNCross(0)
+ ,fNExpected(0)
+ ,fNLast(0)
+ ,fNExpectedLast(0)
+ ,fNdedx(0)
+ ,fChi2Last(1e10)
+ ,fBackupTrack(0x0)
+{
+ //
+ // Constructor from AliESDtrack
+ //
+
+ SetLabel(t.GetLabel());
+ SetChi2(0.0);
+ SetMass(t.GetMass());
+ SetNumberOfClusters(t.GetTRDclusters(fIndex));
+
+ Int_t ncl = t.GetTRDclusters(fIndexBackup);
+ for (UInt_t i = ncl; i < kMAXCLUSTERSPERTRACK; i++) {
+ fIndexBackup[i] = 0;
+ fIndex[i] = 0;
+ }
+
+ for (Int_t i = 0; i < kNplane; i++) {
+ for (Int_t j = 0; j < kNslice; j++) {
+ fdEdxPlane[i][j] = t.GetTRDsignals(i,j);
+ }
+ fTimBinPlane[i] = t.GetTRDTimBin(i);
+ }
+
+ const AliExternalTrackParam *par = &t;
+ if (t.GetStatus() & AliESDtrack::kTRDbackup) {
+ par = t.GetOuterParam();
+ if (!par) {
+ AliError("No backup info!");
+ par = &t;
+ }
+ }
+ Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance());
+
+
+ for (UInt_t i = 0; i < kMAXCLUSTERSPERTRACK; i++) {
+ fdQdl[i] = 0;
+ }
+
+ for (Int_t i = 0; i < 3; i++) {
+ fBudget[i] = 0;
+ }
+
+ if ((t.GetStatus() & AliESDtrack::kTIME) == 0) {
+ return;
+ }
-// Compares tracks according to their Y2
+ StartTimeIntegral();
+ Double_t times[10];
+ t.GetIntegratedTimes(times);
+ SetIntegratedTimes(times);
+ SetIntegratedLength(t.GetIntegratedLength());
- 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());
+//____________________________________________________________________________
+AliTRDtrack::~AliTRDtrack()
+{
+ //
+ // Destructor
+ //
- if (c>co) return 1;
- else if (c<co) return -1;
+ if (fBackupTrack) {
+ delete fBackupTrack;
+ }
+ fBackupTrack = 0;
+
+}
+
+//____________________________________________________________________________
+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)) return 3; // Gold
+ if ((fNLast > 30) &&
+ (fChi2Last/(Float_t(fNLast)) < 3)) return 3; // Gold
+ if ((fNLast > 20) &&
+ (fChi2Last/(Float_t(fNLast)) < 2)) return 3; // Gold
+ if ((fNLast/(fNExpectedLast+3.0) > 0.8) &&
+ (fChi2Last/Float_t(fNLast) < 5) &&
+ (fNLast > 20)) return 2; // Silber
+ if ((fNLast > 5) &&
+ (((fNLast+1.0)/(fNExpectedLast+1.0)) > 0.8) &&
+ (fChi2Last/(fNLast-5.0) < 6)) return 1;
+
+ return status;
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::Compare(const TObject *o) const
+{
+ //
+ // Compares tracks according to their Y2 or curvature
+ //
+
+ AliTRDtrack *t = (AliTRDtrack *) o;
+
+ Double_t co = TMath::Abs(t->GetC());
+ Double_t c = TMath::Abs(GetC());
+
+ 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;
+}
- //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;
+//_____________________________________________________________________________
+Bool_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
+ //
- fX=x2;
+ if (xk == GetX()) {
+ return kTRUE;
+ }
+ Double_t oldX = GetX();
+ Double_t oldY = GetY();
+ Double_t oldZ = GetZ();
- //Multiple scattering ******************
+ Double_t bz = GetBz();
- 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);
+ if (!AliExternalTrackParam::PropagateTo(xk,bz)) {
+ return kFALSE;
+ }
- Double_t ey=fC*fX - fE, ez=fT;
- Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey;
+ Double_t x = GetX();
+ Double_t y = GetY();
+ Double_t z = GetZ();
+ Double_t d = TMath::Sqrt((x-oldX)*(x-oldX)
+ + (y-oldY)*(y-oldY)
+ + (z-oldZ)*(z-oldZ));
+ if (oldX < xk) {
+ if (IsStartedTimeIntegral()) {
+ Double_t l2 = d;
+ Double_t crv = GetC();
+ if (TMath::Abs(l2*crv) > 0.0001) {
+ // Make correction for curvature if neccesary
+ l2 = 0.5 * TMath::Sqrt((x-oldX)*(x-oldX) + (y-oldY)*(y-oldY));
+ l2 = 2.0 * TMath::ASin(l2 * crv) / crv;
+ l2 = TMath::Sqrt(l2*l2 + (z-oldZ)*(z-oldZ));
+ }
+ AddTimeStep(l2);
+ }
+ }
- 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 ll = (oldX < xk) ? -d : d;
+ if (!AliExternalTrackParam::CorrectForMaterial(ll*rho/x0,x0,GetMass())) {
+ return kFALSE;
+ }
+ {
- //Energy losses************************
+ // Energy losses************************
+ Double_t p2 = (1.0 + GetTgl()*GetTgl()) / (Get1Pt()*Get1Pt());
+ Double_t beta2 = p2 / (p2 + GetMass()*GetMass());
+ if ((5940.0 * beta2/(1.0 - beta2 + 1.0e-10) - beta2) < 0.0) {
+ return kFALSE;
+ }
- 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);
+ Double_t dE = 0.153e-3 / beta2
+ * (log(5940.0 * beta2/(1.0 - beta2 + 1.0e-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) dE = 0.0; // Not valid region for Bethe bloch
+ */
+
+ fDE += dE;
+
+ /*
+ // Suspicious ! I.B.
+ Double_t sigmade = 0.07 * TMath::Sqrt(TMath::Abs(dE)); // Energy loss fluctuation
+ Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2);
+ fCcc += sigmac2;
+ fCee += fX*fX * sigmac2;
+ */
- return 1;
+ }
-}
+ return kTRUE;
+}
//_____________________________________________________________________________
-void AliTRDtrack::PropagateToVertex(Double_t x0,Double_t rho,Double_t pm)
+Bool_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, Int_t index
+ , Double_t h01)
{
- // This function propagates tracks to the "vertex".
+ //
+ // Assignes found cluster to the track and updates track information
+ //
- 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);
-}
+ Bool_t fNoTilt = kTRUE;
+ if (TMath::Abs(h01) > 0.003) {
+ fNoTilt = kFALSE;
+ }
+
+ // Add angular effect to the error contribution - MI
+ Float_t tangent2 = GetSnp()*GetSnp();
+ if (tangent2 < 0.90000) {
+ tangent2 = tangent2 / (1.0 - tangent2);
+ }
+ //Float_t errang = tangent2 * 0.04;
+ Double_t p[2] = {c->GetY(), c->GetZ() };
+ //Double_t cov[3] = {c->GetSigmaY2()+errang, 0.0, c->GetSigmaZ2()*100.0 };
+ Double_t sy2 = c->GetSigmaY2() * 4.0;
+ Double_t sz2 = c->GetSigmaZ2() * 4.0;
+ Double_t cov[3] = {sy2 + h01*h01*sz2, h01*(sy2-sz2), sz2 + h01*h01*sy2 };
+
+ if (!AliExternalTrackParam::Update(p,cov)) {
+ return kFALSE;
+ }
+
+ Int_t n = GetNumberOfClusters();
+ fIndex[n] = index;
+ SetNumberOfClusters(n+1);
+
+ SetChi2(GetChi2()+chisq);
+
+ return kTRUE;
+
+}
//_____________________________________________________________________________
-void AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index)
+Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq, Int_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;
-
- Double_t c01=fCzy, c02=fCcy, c03=fCey, c04=fCty;
- Double_t c12=fCcz, c13=fCez, c14=fCtz;
+ // Add angular effect to the error contribution and make correction - MI
+ Double_t tangent2 = GetSnp()*GetSnp();
+ if (tangent2 < 0.90000){
+ tangent2 = tangent2 / (1.0-tangent2);
+ }
+ Double_t tangent = TMath::Sqrt(tangent2);
+ if (GetSnp() < 0) {
+ tangent *= -1;
+ }
- 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;
+ //
+ // Is the following still needed ????
+ //
- fCzz-=k10*c01+k11*fCzz;
- fCcz-=k10*c02+k11*c12; fCez-=k10*c03+k11*c13;
- fCtz-=k10*c04+k11*c14;
+ // Double_t correction = 0*plane;
+ /*
+ Double_t errang = tangent2*0.04; //
+ Double_t errsys =0.025*0.025*20; //systematic error part
+
+ Float_t extend =1;
+ if (c->GetNPads()==4) extend=2;
+ */
+ //if (c->GetNPads()==5) extend=3;
+ //if (c->GetNPads()==6) extend=3;
+ //if (c->GetQ()<15) return 1;
+
+ /*
+ 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 dy=c->GetY() - GetY(), dz=c->GetZ() - GetZ();
+ printf("%e %e %e %e\n",dy,dz,padlength/2,h01);
+ }
+ */
- fCcc-=k20*c02+k21*c12; fCec-=k20*c03+k21*c13;
- fCtc-=k20*c04+k21*c14;
+ Double_t p[2] = { c->GetY(), c->GetZ() };
+ //Double_t cov[3]={ (c->GetSigmaY2()+errang+errsys)*extend, 0.0, c->GetSigmaZ2()*10000.0 };
+ Double_t sy2 = c->GetSigmaY2() * 4.0;
+ Double_t sz2 = c->GetSigmaZ2() * 4.0;
+ Double_t cov[3] = { sy2 + h01*h01*sz2, h01*(sy2-sz2), sz2 + h01*h01*sy2 };
- fCee-=k30*c03+k31*c13;
- fCte-=k30*c04+k31*c14;
+ if (!AliExternalTrackParam::Update(p,cov)) {
+ return kFALSE;
+ }
- fCtt-=k40*c04+k41*c14;
+ Int_t n = GetNumberOfClusters();
+ fIndex[n] = index;
+ SetNumberOfClusters(n+1);
+ SetChi2(GetChi2() + chisq);
- fIndex[fN++]=index;
- fChi2 += chisq;
+ return kTRUE;
- // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
}
+// //_____________________________________________________________________________
+// Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet)
+// {
+// //
+// // Assignes found tracklet to the track and updates track information
+// //
+// // Can this be removed ????
+// //
+//
+// Double_t r00=(tracklet.GetTrackletSigma2()), r01=0., r11= 10000.;
+// 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, dz=tracklet.GetZ() - fZ;
+
+
+// Double_t s00 = tracklet.GetTrackletSigma2(); // error pad
+// Double_t s11 = 100000; // error pad-row
+// Float_t h01 = tracklet.GetTilt();
+// //
+// // r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00;
+// r00 = fCyy + fCzz*h01*h01+s00;
+// // r01 = fCzy + fCzz*h01;
+// r01 = fCzy ;
+// r11 = fCzz + s11;
+// det = r00*r11 - r01*r01;
+// // inverse matrix
+// 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=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
+// Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
+// Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
+
+// // 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
+// Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
+// // cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
+// if (TMath::Abs(cur*fX-eta) >= 0.90000) {
+// //Int_t n=GetNumberOfClusters();
+// // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
+// return 0;
+// }
+// // k01+=h01*k00;
+// // k11+=h01*k10;
+// // k21+=h01*k20;
+// // k31+=h01*k30;
+// // k41+=h01*k40;
+
+
+// fY += k00*dy + k01*dz;
+// fZ += k10*dy + k11*dz;
+// fE = eta;
+// fT += k30*dy + k31*dz;
+// fC = cur;
+
+
+// //Update covariance
+// //
+// //
+// Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc;
+// Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy;
+// Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz;
+// //Double_t oldte = fCte, 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);
+// // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
+
+// return 1;
+
+// }
+
//_____________________________________________________________________________
-Int_t AliTRDtrack::Rotate(Double_t alpha)
+Bool_t AliTRDtrack::Rotate(Double_t alpha, Bool_t absolute)
{
+ //
// Rotates track parameters in R*phi plane
+ // if absolute rotation alpha is in global system
+ // otherwise alpha rotation is relative to the current rotation angle
+ //
- fAlpha += alpha;
+ if (absolute) {
+ alpha -= GetAlpha();
+ }
+ else{
+ fNRotate++;
+ }
- Double_t x1=fX, y1=fY;
- Double_t ca=cos(alpha), sa=sin(alpha);
- Double_t r1=fC*fX - fE;
+ return AliExternalTrackParam::Rotate(GetAlpha()+alpha);
- fX = x1*ca + y1*sa;
- fY=-x1*sa + y1*ca;
- fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa;
+}
- Double_t r2=fC*fX - fE;
- if (TMath::Abs(r2) >= 0.99999) {
- if (fN>4) cerr<<fN<<" AliTRDtrack warning: Rotation failed !\n";
- return 0;
+//_____________________________________________________________________________
+Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const
+{
+ //
+ // Returns the track chi2
+ //
+
+ Double_t p[2] = { c->GetY(), c->GetZ() };
+ Double_t sy2 = c->GetSigmaY2() * 4.0;
+ Double_t sz2 = c->GetSigmaZ2() * 4.0;
+ Double_t cov[3] = { sy2 + h01*h01*sz2, h01*(sy2-sz2), sz2 + h01*h01*sy2 };
+
+ return AliExternalTrackParam::GetPredictedChi2(p,cov);
+
+ //
+ // Can the following be removed ????
+ //
+ /*
+ Bool_t fNoTilt = kTRUE;
+ if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
+
+ return (c->GetY() - GetY())*(c->GetY() - GetY())/c->GetSigmaY2();
+ */
+
+ /*
+ Double_t chi2, dy, r00, r01, r11;
+
+ if(fNoTilt) {
+ dy=c->GetY() - fY;
+ r00=c->GetSigmaY2();
+ chi2 = (dy*dy)/r00;
}
+ else {
+ Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12);
+ //
+ r00=c->GetSigmaY2(); r01=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) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n";
+ return 1e10;
+ }
+ Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01;
+ Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
+ Double_t tiltdz = dz;
+ if (TMath::Abs(tiltdz)>padlength/2.) {
+ tiltdz = TMath::Sign(padlength/2,dz);
+ }
+ // dy=dy+h01*dz;
+ dy=dy+h01*tiltdz;
- 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;
+ chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
}
- //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;
-
- //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;
-
- //a = f*b = f*C*ft
- Double_t a00=f00*b00, a03=f00*b03, a33=f30*b03+f32*b23+f33*b33;
-
- // *** Double_t dy2=fCyy;
-
- //F*C*Ft = C + (a + b + bt)
- fCyy += a00 + 2*b00;
- fCzy += b10;
- fCcy += b20;
- fCey += a03+b30+b03;
- fCty += b40;
- fCez += b13;
- fCec += b23;
- fCee += a33 + 2*b33;
- fCte += b43;
-
- // *** fCyy+=dy2*sa*sa*r1*r1/(1.- r1*r1);
- // *** fCzz+=d2y*sa*sa*fT*fT/(1.- r1*r1);
-
- return 1;
-}
+ return chi2;
+ */
+}
+//_____________________________________________________________________________
+void AliTRDtrack::MakeBackupTrack()
+{
+ //
+ // Creates a backup track
+ //
+ if (fBackupTrack) {
+ delete fBackupTrack;
+ }
+ fBackupTrack = new AliTRDtrack(*this);
+
+}
//_____________________________________________________________________________
-Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c) const
+Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z)
{
- Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2()*12;
- r00+=fCyy; r01+=fCzy; r11+=fCzz;
+ //
+ // Find a prolongation at given x
+ // Return 0 if it does not exist
+ //
+
+ Double_t bz = GetBz();
+
+ if (!AliExternalTrackParam::GetYAt(xk,bz,y)) {
+ return 0;
+ }
+ if (!AliExternalTrackParam::GetZAt(xk,bz,z)) {
+ return 0;
+ }
+
+ return 1;
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::PropagateToX(Double_t xr, Double_t step)
+{
+ //
+ // Propagate track to given x position
+ // Works inside of the 20 degree segmentation (local cooordinate frame for TRD , TPC, TOF)
+ //
+ // Material budget from geo manager
+ //
+
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t y;
+ Double_t z;
+
+ const Double_t kAlphac = TMath::Pi()/9.0;
+ const Double_t kTalphac = TMath::Tan(kAlphac*0.5);
+
+ // Critical alpha - cross sector indication
+ Double_t dir = (GetX()>xr) ? -1.0 : 1.0;
+
+ // Direction +-
+ for (Double_t x = GetX()+dir*step; dir*x < dir*xr; x += dir*step) {
+
+ GetXYZ(xyz0);
+ GetProlongation(x,y,z);
+ xyz1[0] = x * TMath::Cos(GetAlpha()) + y * TMath::Sin(GetAlpha());
+ xyz1[1] = x * TMath::Sin(GetAlpha()) - y * TMath::Cos(GetAlpha());
+ 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 (GetY() > GetX()*kTalphac) {
+ Rotate(-kAlphac);
+ }
+ if (GetY() < -GetX()*kTalphac) {
+ Rotate( kAlphac);
+ }
- 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;
- Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
+ PropagateTo(xr);
- return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
-}
+ return 0;
+}
-//_________________________________________________________________________
-void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
+//_____________________________________________________________________________
+Int_t AliTRDtrack::PropagateToR(Double_t r,Double_t step)
{
- // Returns reconstructed track momentum in the global system.
-
- 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;
+ //
+ // Propagate track to the radial position
+ // Rotation always connected to the last track position
+ //
-}
+ Double_t xyz0[3];
+ Double_t xyz1[3];
+ Double_t y;
+ Double_t z;
+
+ Double_t radius = TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
+ // Direction +-
+ Double_t dir = (radius>r) ? -1.0 : 1.0;
+
+ for (Double_t x = radius+dir*step; dir*x < dir*r; x += dir*step) {
+
+ GetXYZ(xyz0);
+ Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
+ Rotate(alpha,kTRUE);
+ GetXYZ(xyz0);
+ 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) {
+ param[1] = 100000000;
+ }
+ PropagateTo(x,param[1],param[0]);
+
+ }
+
+ GetXYZ(xyz0);
+ Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
+ Rotate(alpha,kTRUE);
+ GetXYZ(xyz0);
+ 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) {
+ param[1] = 100000000;
+ }
+ PropagateTo(r,param[1],param[0]);
-//____________________________________________________________________________
-void AliTRDtrack::Streamer(TBuffer &R__b)
+ return 0;
+
+}
+
+//_____________________________________________________________________________
+Int_t AliTRDtrack::GetSector() const
{
- 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];
- }
-}
+ //
+ // Return the current sector
+ //
+
+ return Int_t(TVector2::Phi_0_2pi(GetAlpha()) / AliTRDgeometry::GetAlpha())
+ % AliTRDgeometry::kNsect;
+
+}
//_____________________________________________________________________________
-void AliTRDseed::CookdEdx(Double_t low, Double_t up) {
+void AliTRDtrack::SetSampledEdx(Float_t q, Int_t i)
+{
+ //
+ // The sampled energy loss
+ //
- // Calculates dE/dX within the "low" and "up" cuts.
+ Double_t s = GetSnp();
+ Double_t t = GetTgl();
+ q *= TMath::Sqrt((1.0 - s*s) / (1.0 + t*t));
+ fdQdl[i] = q;
- 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++;
- }
- } while (swap);
+//_____________________________________________________________________________
+void AliTRDtrack::SetSampledEdx(Float_t q)
+{
+ //
+ // The sampled energy loss
+ //
- 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);
-}
+ Double_t s = GetSnp();
+ Double_t t = GetTgl();
+ q *= TMath::Sqrt((1.0 - s*s) / (1.0 + t*t));
+ fdQdl[fNdedx] = q;
+ fNdedx++;
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDtrack::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