//
///////////////////////////////////////////////////
-#include <Riostream.h>
-
-#include "AliCallf77.h"
+//#include <Riostream.h>
#include "AliMUON.h"
#include "AliMUONTrackParam.h"
-#include "AliMUONChamber.h"
-#include "AliRun.h"
+#include "AliMUONConstants.h"
+#include "AliESDMuonTrack.h"
#include "AliMagF.h"
#include "AliLog.h"
+#include "AliTracker.h"
ClassImp(AliMUONTrackParam) // Class implementation in ROOT context
- // A few calls in Fortran or from Fortran (extrap.F).
- // Needed, instead of calls to Geant subroutines,
- // because double precision is necessary for track fit converging with Minuit.
- // The "extrap" functions should be translated into C++ ????
-#ifndef WIN32
-# define extrap_onestep_helix extrap_onestep_helix_
-# define extrap_onestep_helix3 extrap_onestep_helix3_
-# define extrap_onestep_rungekutta extrap_onestep_rungekutta_
-# define gufld_double gufld_double_
-#else
-# define extrap_onestep_helix EXTRAP_ONESTEP_HELIX
-# define extrap_onestep_helix3 EXTRAP_ONESTEP_HELIX3
-# define extrap_onestep_rungekutta EXTRAP_ONESTEP_RUNGEKUTTA
-# define gufld_double GUFLD_DOUBLE
-#endif
-
-extern "C" {
- void type_of_call extrap_onestep_helix
- (Double_t &Charge, Double_t &StepLength, Double_t *VGeant3, Double_t *VGeant3New);
-
- void type_of_call extrap_onestep_helix3
- (Double_t &Field, Double_t &StepLength, Double_t *VGeant3, Double_t *VGeant3New);
-
- void type_of_call extrap_onestep_rungekutta
- (Double_t &Charge, Double_t &StepLength, Double_t *VGeant3, Double_t *VGeant3New);
-
- void type_of_call gufld_double(Double_t *Position, Double_t *Field) {
- // interface to "gAlice->Field()->Field" for arguments in double precision
- Float_t x[3], b[3];
- x[0] = Position[0]; x[1] = Position[1]; x[2] = Position[2];
- gAlice->Field()->Field(x, b);
- Field[0] = b[0]; Field[1] = b[1]; Field[2] = b[2];
- }
-}
-
//_________________________________________________________________________
AliMUONTrackParam::AliMUONTrackParam()
- : TObject()
+ : TObject(),
+ fInverseBendingMomentum(0.),
+ fBendingSlope(0.),
+ fNonBendingSlope(0.),
+ fZ(0.),
+ fBendingCoor(0.),
+ fNonBendingCoor(0.)
{
// Constructor
-
- fInverseBendingMomentum = 0;
- fBendingSlope = 0;
- fNonBendingSlope = 0;
- fZ = 0;
- fBendingCoor = 0;
- fNonBendingCoor = 0;
+ // get field from outside
+ fkField = AliTracker::GetFieldMap();
+ if (!fkField) AliFatal("No field available");
}
//_________________________________________________________________________
AliMUONTrackParam&
AliMUONTrackParam::operator=(const AliMUONTrackParam& theMUONTrackParam)
{
+ // Asignment operator
if (this == &theMUONTrackParam)
return *this;
}
//_________________________________________________________________________
AliMUONTrackParam::AliMUONTrackParam(const AliMUONTrackParam& theMUONTrackParam)
- : TObject(theMUONTrackParam)
+ : TObject(theMUONTrackParam),
+ fInverseBendingMomentum(theMUONTrackParam.fInverseBendingMomentum),
+ fBendingSlope(theMUONTrackParam.fBendingSlope),
+ fNonBendingSlope(theMUONTrackParam.fNonBendingSlope),
+ fZ(theMUONTrackParam.fZ),
+ fBendingCoor(theMUONTrackParam.fBendingCoor),
+ fNonBendingCoor(theMUONTrackParam.fNonBendingCoor)
{
- fInverseBendingMomentum = theMUONTrackParam.fInverseBendingMomentum;
- fBendingSlope = theMUONTrackParam.fBendingSlope;
- fNonBendingSlope = theMUONTrackParam.fNonBendingSlope;
- fZ = theMUONTrackParam.fZ;
- fBendingCoor = theMUONTrackParam.fBendingCoor;
- fNonBendingCoor = theMUONTrackParam.fNonBendingCoor;
+ // Copy constructor
+
+}
+
+ //_________________________________________________________________________
+void AliMUONTrackParam::GetParamFrom(const AliESDMuonTrack& esdMuonTrack)
+{
+ // assigned value form ESD track.
+ fInverseBendingMomentum = esdMuonTrack.GetInverseBendingMomentum();
+ fBendingSlope = TMath::Tan(esdMuonTrack.GetThetaY());
+ fNonBendingSlope = TMath::Tan(esdMuonTrack.GetThetaX());
+ fZ = esdMuonTrack.GetZ();
+ fBendingCoor = esdMuonTrack.GetBendingCoor();
+ fNonBendingCoor = esdMuonTrack.GetNonBendingCoor();
+}
+
+ //_________________________________________________________________________
+void AliMUONTrackParam::SetParamFor(AliESDMuonTrack& esdMuonTrack)
+{
+ // assigned value form ESD track.
+ esdMuonTrack.SetInverseBendingMomentum(fInverseBendingMomentum);
+ esdMuonTrack.SetThetaX(TMath::ATan(fNonBendingSlope));
+ esdMuonTrack.SetThetaY(TMath::ATan(fBendingSlope));
+ esdMuonTrack.SetZ(fZ);
+ esdMuonTrack.SetBendingCoor(fBendingCoor);
+ esdMuonTrack.SetNonBendingCoor(fNonBendingCoor);
}
//__________________________________________________________________________
(stepNumber < maxStepNumber)) {
stepNumber++;
// Option for switching between helix and Runge-Kutta ????
- // extrap_onestep_rungekutta(chargeExtrap, stepLength, vGeant3, vGeant3New);
- extrap_onestep_helix(chargeExtrap, stepLength, vGeant3, vGeant3New);
+ //ExtrapOneStepRungekutta(chargeExtrap, stepLength, vGeant3, vGeant3New);
+ ExtrapOneStepHelix(chargeExtrap, stepLength, vGeant3, vGeant3New);
if ((-forwardBackward * (vGeant3New[2] - Z)) > 0.0) break; // one is beyond Z spectro. z<0
// better use TArray ????
for (iGeant3 = 0; iGeant3 < 7; iGeant3++)
// Interpolation back to exact Z (2nd order)
// should be in function ???? using TArray ????
Double_t dZ12 = vGeant3New[2] - vGeant3[2]; // 1->2
- Double_t dZ1i = Z - vGeant3[2]; // 1-i
- Double_t dZi2 = vGeant3New[2] - Z; // i->2
- Double_t xPrime = (vGeant3New[0] - vGeant3[0]) / dZ12;
- Double_t xSecond =
- ((vGeant3New[3] / vGeant3New[5]) - (vGeant3[3] / vGeant3[5])) / dZ12;
- Double_t yPrime = (vGeant3New[1] - vGeant3[1]) / dZ12;
- Double_t ySecond =
- ((vGeant3New[4] / vGeant3New[5]) - (vGeant3[4] / vGeant3[5])) / dZ12;
- vGeant3[0] = vGeant3[0] + xPrime * dZ1i - 0.5 * xSecond * dZ1i * dZi2; // X
- vGeant3[1] = vGeant3[1] + yPrime * dZ1i - 0.5 * ySecond * dZ1i * dZi2; // Y
- vGeant3[2] = Z; // Z
- Double_t xPrimeI = xPrime - 0.5 * xSecond * (dZi2 - dZ1i);
- Double_t yPrimeI = yPrime - 0.5 * ySecond * (dZi2 - dZ1i);
- // (PX, PY, PZ)/PTOT assuming forward motion
- vGeant3[5] =
- 1.0 / TMath::Sqrt(1.0 + xPrimeI * xPrimeI + yPrimeI * yPrimeI); // PZ/PTOT
- vGeant3[3] = xPrimeI * vGeant3[5]; // PX/PTOT
- vGeant3[4] = yPrimeI * vGeant3[5]; // PY/PTOT
+ if (TMath::Abs(dZ12) > 0) {
+ Double_t dZ1i = Z - vGeant3[2]; // 1-i
+ Double_t dZi2 = vGeant3New[2] - Z; // i->2
+ Double_t xPrime = (vGeant3New[0] - vGeant3[0]) / dZ12;
+ Double_t xSecond =
+ ((vGeant3New[3] / vGeant3New[5]) - (vGeant3[3] / vGeant3[5])) / dZ12;
+ Double_t yPrime = (vGeant3New[1] - vGeant3[1]) / dZ12;
+ Double_t ySecond =
+ ((vGeant3New[4] / vGeant3New[5]) - (vGeant3[4] / vGeant3[5])) / dZ12;
+ vGeant3[0] = vGeant3[0] + xPrime * dZ1i - 0.5 * xSecond * dZ1i * dZi2; // X
+ vGeant3[1] = vGeant3[1] + yPrime * dZ1i - 0.5 * ySecond * dZ1i * dZi2; // Y
+ vGeant3[2] = Z; // Z
+ Double_t xPrimeI = xPrime - 0.5 * xSecond * (dZi2 - dZ1i);
+ Double_t yPrimeI = yPrime - 0.5 * ySecond * (dZi2 - dZ1i);
+ // (PX, PY, PZ)/PTOT assuming forward motion
+ vGeant3[5] =
+ 1.0 / TMath::Sqrt(1.0 + xPrimeI * xPrimeI + yPrimeI * yPrimeI); // PZ/PTOT
+ vGeant3[3] = xPrimeI * vGeant3[5]; // PX/PTOT
+ vGeant3[4] = yPrimeI * vGeant3[5]; // PY/PTOT
+ } else {
+ AliWarning(Form("Extrap. to Z not reached, Z = %f",Z));
+ }
// Track parameters from Geant3 parameters,
// with charge back for forward motion
GetFromGeant3Parameters(vGeant3, chargeExtrap * forwardBackward);
// pointed to by "TrackParam" (index 0 and 1 for first and second chambers).
Double_t extZ[2], z1, z2;
Int_t i1 = -1, i2 = -1; // = -1 to avoid compilation warnings
- AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
// range of Station to be checked ????
- z1 = (&(pMUON->Chamber(2 * Station)))->Z(); // Z of first chamber
- z2 = (&(pMUON->Chamber(2 * Station + 1)))->Z(); // Z of second chamber
+ z1 = AliMUONConstants::DefaultChamberZ(2 * Station);
+ z2 = AliMUONConstants::DefaultChamberZ(2 * Station + 1);
// First and second Z to extrapolate at
if ((z1 > this->fZ) && (z2 > this->fZ)) {i1 = 0; i2 = 1;}
else if ((z1 < this->fZ) && (z2 < this->fZ)) {i1 = 1; i2 = 0;}
} else {
deltaP = 3.0714 + 0.011767 *pTotal;
}
+ deltaP *= 0.75; // AZ
} else {
if (pTotal < 20) {
deltaP = 2.1207 + 0.05478 * pTotal - 0.00145079 * pTotal * pTotal;
} else {
deltaP = 2.6069 + 0.0051705 * pTotal;
}
+ deltaP *= 0.9; // AZ
}
pTotalCorrected = pTotal + deltaP / TMath::Cos(theta);
return pTotalCorrected;
x[1] = x[2]*fBendingSlope;
// Take magn. field value at position x.
- gAlice->Field()->Field(x, b);
+ fkField->Field(x, b);
bZ = b[2];
// Transverse momentum rotation
}
//__________________________________________________________________________
-Double_t AliMUONTrackParam::Px()
+Double_t AliMUONTrackParam::Px() const
{
// return px from track paramaters
Double_t pYZ, pZ, pX;
return pX;
}
//__________________________________________________________________________
-Double_t AliMUONTrackParam::Py()
+Double_t AliMUONTrackParam::Py() const
{
// return px from track paramaters
Double_t pYZ, pZ, pY;
return pY;
}
//__________________________________________________________________________
-Double_t AliMUONTrackParam::Pz()
+Double_t AliMUONTrackParam::Pz() const
{
// return px from track paramaters
Double_t pYZ, pZ;
return pZ;
}
//__________________________________________________________________________
-Double_t AliMUONTrackParam::P()
+Double_t AliMUONTrackParam::P() const
{
// return p from track paramaters
Double_t pYZ, pZ, p;
TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope + fNonBendingSlope * fNonBendingSlope);
return p;
+}
+ //__________________________________________________________________________
+void AliMUONTrackParam::ExtrapOneStepHelix(Double_t charge, Double_t step,
+ Double_t *vect, Double_t *vout) const
+{
+// ******************************************************************
+// * *
+// * Performs the tracking of one step in a magnetic field *
+// * The trajectory is assumed to be a helix in a constant field *
+// * taken at the mid point of the step. *
+// * Parameters: *
+// * input *
+// * STEP =arc length of the step asked *
+// * VECT =input vector (position,direction cos and momentum) *
+// * CHARGE= electric charge of the particle *
+// * output *
+// * VOUT = same as VECT after completion of the step *
+// * *
+// * ==>Called by : <USER>, GUSWIM *
+// * Author m.hansroul ********* *
+// * modified s.egli, s.v.levonian *
+// * modified v.perevoztchikov
+// * *
+// ******************************************************************
+//
+
+// modif: everything in double precision
+
+ Double_t xyz[3], h[4], hxp[3];
+ Double_t h2xy, hp, rho, tet;
+ Double_t sint, sintt, tsint, cos1t;
+ Double_t f1, f2, f3, f4, f5, f6;
+
+ const Int_t kix = 0;
+ const Int_t kiy = 1;
+ const Int_t kiz = 2;
+ const Int_t kipx = 3;
+ const Int_t kipy = 4;
+ const Int_t kipz = 5;
+ const Int_t kipp = 6;
+
+ const Double_t kec = 2.9979251e-4;
+ //
+ // ------------------------------------------------------------------
+ //
+ // units are kgauss,centimeters,gev/c
+ //
+ vout[kipp] = vect[kipp];
+ if (TMath::Abs(charge) < 0.00001) {
+ for (Int_t i = 0; i < 3; i++) {
+ vout[i] = vect[i] + step * vect[i+3];
+ vout[i+3] = vect[i+3];
+ }
+ return;
+ }
+ xyz[0] = vect[kix] + 0.5 * step * vect[kipx];
+ xyz[1] = vect[kiy] + 0.5 * step * vect[kipy];
+ xyz[2] = vect[kiz] + 0.5 * step * vect[kipz];
+
+ //cmodif: call gufld (xyz, h) changed into:
+ GetField (xyz, h);
+
+ h2xy = h[0]*h[0] + h[1]*h[1];
+ h[3] = h[2]*h[2]+ h2xy;
+ if (h[3] < 1.e-12) {
+ for (Int_t i = 0; i < 3; i++) {
+ vout[i] = vect[i] + step * vect[i+3];
+ vout[i+3] = vect[i+3];
+ }
+ return;
+ }
+ if (h2xy < 1.e-12*h[3]) {
+ ExtrapOneStepHelix3(charge*h[2], step, vect, vout);
+ return;
+ }
+ h[3] = TMath::Sqrt(h[3]);
+ h[0] /= h[3];
+ h[1] /= h[3];
+ h[2] /= h[3];
+ h[3] *= kec;
+
+ hxp[0] = h[1]*vect[kipz] - h[2]*vect[kipy];
+ hxp[1] = h[2]*vect[kipx] - h[0]*vect[kipz];
+ hxp[2] = h[0]*vect[kipy] - h[1]*vect[kipx];
+
+ hp = h[0]*vect[kipx] + h[1]*vect[kipy] + h[2]*vect[kipz];
+
+ rho = -charge*h[3]/vect[kipp];
+ tet = rho * step;
+
+ if (TMath::Abs(tet) > 0.15) {
+ sint = TMath::Sin(tet);
+ sintt = (sint/tet);
+ tsint = (tet-sint)/tet;
+ cos1t = 2.*(TMath::Sin(0.5*tet))*(TMath::Sin(0.5*tet))/tet;
+ } else {
+ tsint = tet*tet/36.;
+ sintt = (1. - tsint);
+ sint = tet*sintt;
+ cos1t = 0.5*tet;
+ }
+
+ f1 = step * sintt;
+ f2 = step * cos1t;
+ f3 = step * tsint * hp;
+ f4 = -tet*cos1t;
+ f5 = sint;
+ f6 = tet * cos1t * hp;
+
+ vout[kix] = vect[kix] + f1*vect[kipx] + f2*hxp[0] + f3*h[0];
+ vout[kiy] = vect[kiy] + f1*vect[kipy] + f2*hxp[1] + f3*h[1];
+ vout[kiz] = vect[kiz] + f1*vect[kipz] + f2*hxp[2] + f3*h[2];
+
+ vout[kipx] = vect[kipx] + f4*vect[kipx] + f5*hxp[0] + f6*h[0];
+ vout[kipy] = vect[kipy] + f4*vect[kipy] + f5*hxp[1] + f6*h[1];
+ vout[kipz] = vect[kipz] + f4*vect[kipz] + f5*hxp[2] + f6*h[2];
+
+ return;
+}
+
+ //__________________________________________________________________________
+void AliMUONTrackParam::ExtrapOneStepHelix3(Double_t field, Double_t step,
+ Double_t *vect, Double_t *vout) const
+{
+//
+// ******************************************************************
+// * *
+// * Tracking routine in a constant field oriented *
+// * along axis 3 *
+// * Tracking is performed with a conventional *
+// * helix step method *
+// * *
+// * ==>Called by : <USER>, GUSWIM *
+// * Authors R.Brun, M.Hansroul ********* *
+// * Rewritten V.Perevoztchikov
+// * *
+// ******************************************************************
+//
+
+ Double_t hxp[3];
+ Double_t h4, hp, rho, tet;
+ Double_t sint, sintt, tsint, cos1t;
+ Double_t f1, f2, f3, f4, f5, f6;
+
+ const Int_t kix = 0;
+ const Int_t kiy = 1;
+ const Int_t kiz = 2;
+ const Int_t kipx = 3;
+ const Int_t kipy = 4;
+ const Int_t kipz = 5;
+ const Int_t kipp = 6;
+
+ const Double_t kec = 2.9979251e-4;
+
+//
+// ------------------------------------------------------------------
+//
+// units are kgauss,centimeters,gev/c
+//
+ vout[kipp] = vect[kipp];
+ h4 = field * kec;
+
+ hxp[0] = - vect[kipy];
+ hxp[1] = + vect[kipx];
+
+ hp = vect[kipz];
+
+ rho = -h4/vect[kipp];
+ tet = rho * step;
+ if (TMath::Abs(tet) > 0.15) {
+ sint = TMath::Sin(tet);
+ sintt = (sint/tet);
+ tsint = (tet-sint)/tet;
+ cos1t = 2.* TMath::Sin(0.5*tet) * TMath::Sin(0.5*tet)/tet;
+ } else {
+ tsint = tet*tet/36.;
+ sintt = (1. - tsint);
+ sint = tet*sintt;
+ cos1t = 0.5*tet;
+ }
+
+ f1 = step * sintt;
+ f2 = step * cos1t;
+ f3 = step * tsint * hp;
+ f4 = -tet*cos1t;
+ f5 = sint;
+ f6 = tet * cos1t * hp;
+
+ vout[kix] = vect[kix] + f1*vect[kipx] + f2*hxp[0];
+ vout[kiy] = vect[kiy] + f1*vect[kipy] + f2*hxp[1];
+ vout[kiz] = vect[kiz] + f1*vect[kipz] + f3;
+
+ vout[kipx] = vect[kipx] + f4*vect[kipx] + f5*hxp[0];
+ vout[kipy] = vect[kipy] + f4*vect[kipy] + f5*hxp[1];
+ vout[kipz] = vect[kipz] + f4*vect[kipz] + f6;
+
+ return;
+}
+ //__________________________________________________________________________
+void AliMUONTrackParam::ExtrapOneStepRungekutta(Double_t charge, Double_t step,
+ Double_t* vect, Double_t* vout) const
+{
+//
+// ******************************************************************
+// * *
+// * Runge-Kutta method for tracking a particle through a magnetic *
+// * field. Uses Nystroem algorithm (See Handbook Nat. Bur. of *
+// * Standards, procedure 25.5.20) *
+// * *
+// * Input parameters *
+// * CHARGE Particle charge *
+// * STEP Step size *
+// * VECT Initial co-ords,direction cosines,momentum *
+// * Output parameters *
+// * VOUT Output co-ords,direction cosines,momentum *
+// * User routine called *
+// * CALL GUFLD(X,F) *
+// * *
+// * ==>Called by : <USER>, GUSWIM *
+// * Authors R.Brun, M.Hansroul ********* *
+// * V.Perevoztchikov (CUT STEP implementation) *
+// * *
+// * *
+// ******************************************************************
+//
+
+ Double_t h2, h4, f[4];
+ Double_t xyzt[3], a, b, c, ph,ph2;
+ Double_t secxs[4],secys[4],seczs[4],hxp[3];
+ Double_t g1, g2, g3, g4, g5, g6, ang2, dxt, dyt, dzt;
+ Double_t est, at, bt, ct, cba;
+ Double_t f1, f2, f3, f4, rho, tet, hnorm, hp, rho1, sint, cost;
+
+ Double_t x;
+ Double_t y;
+ Double_t z;
+
+ Double_t xt;
+ Double_t yt;
+ Double_t zt;
+
+ Double_t maxit = 1992;
+ Double_t maxcut = 11;
+
+ const Double_t kdlt = 1e-4;
+ const Double_t kdlt32 = kdlt/32.;
+ const Double_t kthird = 1./3.;
+ const Double_t khalf = 0.5;
+ const Double_t kec = 2.9979251e-4;
+
+ const Double_t kpisqua = 9.86960440109;
+ const Int_t kix = 0;
+ const Int_t kiy = 1;
+ const Int_t kiz = 2;
+ const Int_t kipx = 3;
+ const Int_t kipy = 4;
+ const Int_t kipz = 5;
+
+ // *.
+ // *. ------------------------------------------------------------------
+ // *.
+ // * this constant is for units cm,gev/c and kgauss
+ // *
+ Int_t iter = 0;
+ Int_t ncut = 0;
+ for(Int_t j = 0; j < 7; j++)
+ vout[j] = vect[j];
+
+ Double_t pinv = kec * charge / vect[6];
+ Double_t tl = 0.;
+ Double_t h = step;
+ Double_t rest;
+
+
+ do {
+ rest = step - tl;
+ if (TMath::Abs(h) > TMath::Abs(rest)) h = rest;
+ //cmodif: call gufld(vout,f) changed into:
+
+ GetField(vout,f);
+
+ // *
+ // * start of integration
+ // *
+ x = vout[0];
+ y = vout[1];
+ z = vout[2];
+ a = vout[3];
+ b = vout[4];
+ c = vout[5];
+
+ h2 = khalf * h;
+ h4 = khalf * h2;
+ ph = pinv * h;
+ ph2 = khalf * ph;
+ secxs[0] = (b * f[2] - c * f[1]) * ph2;
+ secys[0] = (c * f[0] - a * f[2]) * ph2;
+ seczs[0] = (a * f[1] - b * f[0]) * ph2;
+ ang2 = (secxs[0]*secxs[0] + secys[0]*secys[0] + seczs[0]*seczs[0]);
+ if (ang2 > kpisqua) break;
+
+ dxt = h2 * a + h4 * secxs[0];
+ dyt = h2 * b + h4 * secys[0];
+ dzt = h2 * c + h4 * seczs[0];
+ xt = x + dxt;
+ yt = y + dyt;
+ zt = z + dzt;
+ // *
+ // * second intermediate point
+ // *
+
+ est = TMath::Abs(dxt) + TMath::Abs(dyt) + TMath::Abs(dzt);
+ if (est > h) {
+ if (ncut++ > maxcut) break;
+ h *= khalf;
+ continue;
+ }
+
+ xyzt[0] = xt;
+ xyzt[1] = yt;
+ xyzt[2] = zt;
+
+ //cmodif: call gufld(xyzt,f) changed into:
+ GetField(xyzt,f);
+
+ at = a + secxs[0];
+ bt = b + secys[0];
+ ct = c + seczs[0];
+
+ secxs[1] = (bt * f[2] - ct * f[1]) * ph2;
+ secys[1] = (ct * f[0] - at * f[2]) * ph2;
+ seczs[1] = (at * f[1] - bt * f[0]) * ph2;
+ at = a + secxs[1];
+ bt = b + secys[1];
+ ct = c + seczs[1];
+ secxs[2] = (bt * f[2] - ct * f[1]) * ph2;
+ secys[2] = (ct * f[0] - at * f[2]) * ph2;
+ seczs[2] = (at * f[1] - bt * f[0]) * ph2;
+ dxt = h * (a + secxs[2]);
+ dyt = h * (b + secys[2]);
+ dzt = h * (c + seczs[2]);
+ xt = x + dxt;
+ yt = y + dyt;
+ zt = z + dzt;
+ at = a + 2.*secxs[2];
+ bt = b + 2.*secys[2];
+ ct = c + 2.*seczs[2];
+
+ est = TMath::Abs(dxt)+TMath::Abs(dyt)+TMath::Abs(dzt);
+ if (est > 2.*TMath::Abs(h)) {
+ if (ncut++ > maxcut) break;
+ h *= khalf;
+ continue;
+ }
+
+ xyzt[0] = xt;
+ xyzt[1] = yt;
+ xyzt[2] = zt;
+
+ //cmodif: call gufld(xyzt,f) changed into:
+ GetField(xyzt,f);
+
+ z = z + (c + (seczs[0] + seczs[1] + seczs[2]) * kthird) * h;
+ y = y + (b + (secys[0] + secys[1] + secys[2]) * kthird) * h;
+ x = x + (a + (secxs[0] + secxs[1] + secxs[2]) * kthird) * h;
+
+ secxs[3] = (bt*f[2] - ct*f[1])* ph2;
+ secys[3] = (ct*f[0] - at*f[2])* ph2;
+ seczs[3] = (at*f[1] - bt*f[0])* ph2;
+ a = a+(secxs[0]+secxs[3]+2. * (secxs[1]+secxs[2])) * kthird;
+ b = b+(secys[0]+secys[3]+2. * (secys[1]+secys[2])) * kthird;
+ c = c+(seczs[0]+seczs[3]+2. * (seczs[1]+seczs[2])) * kthird;
+
+ est = TMath::Abs(secxs[0]+secxs[3] - (secxs[1]+secxs[2]))
+ + TMath::Abs(secys[0]+secys[3] - (secys[1]+secys[2]))
+ + TMath::Abs(seczs[0]+seczs[3] - (seczs[1]+seczs[2]));
+
+ if (est > kdlt && TMath::Abs(h) > 1.e-4) {
+ if (ncut++ > maxcut) break;
+ h *= khalf;
+ continue;
+ }
+
+ ncut = 0;
+ // * if too many iterations, go to helix
+ if (iter++ > maxit) break;
+
+ tl += h;
+ if (est < kdlt32)
+ h *= 2.;
+ cba = 1./ TMath::Sqrt(a*a + b*b + c*c);
+ vout[0] = x;
+ vout[1] = y;
+ vout[2] = z;
+ vout[3] = cba*a;
+ vout[4] = cba*b;
+ vout[5] = cba*c;
+ rest = step - tl;
+ if (step < 0.) rest = -rest;
+ if (rest < 1.e-5*TMath::Abs(step)) return;
+
+ } while(1);
+
+ // angle too big, use helix
+
+ f1 = f[0];
+ f2 = f[1];
+ f3 = f[2];
+ f4 = TMath::Sqrt(f1*f1+f2*f2+f3*f3);
+ rho = -f4*pinv;
+ tet = rho * step;
+
+ hnorm = 1./f4;
+ f1 = f1*hnorm;
+ f2 = f2*hnorm;
+ f3 = f3*hnorm;
+
+ hxp[0] = f2*vect[kipz] - f3*vect[kipy];
+ hxp[1] = f3*vect[kipx] - f1*vect[kipz];
+ hxp[2] = f1*vect[kipy] - f2*vect[kipx];
+
+ hp = f1*vect[kipx] + f2*vect[kipy] + f3*vect[kipz];
+
+ rho1 = 1./rho;
+ sint = TMath::Sin(tet);
+ cost = 2.*TMath::Sin(khalf*tet)*TMath::Sin(khalf*tet);
+
+ g1 = sint*rho1;
+ g2 = cost*rho1;
+ g3 = (tet-sint) * hp*rho1;
+ g4 = -cost;
+ g5 = sint;
+ g6 = cost * hp;
+
+ vout[kix] = vect[kix] + g1*vect[kipx] + g2*hxp[0] + g3*f1;
+ vout[kiy] = vect[kiy] + g1*vect[kipy] + g2*hxp[1] + g3*f2;
+ vout[kiz] = vect[kiz] + g1*vect[kipz] + g2*hxp[2] + g3*f3;
+
+ vout[kipx] = vect[kipx] + g4*vect[kipx] + g5*hxp[0] + g6*f1;
+ vout[kipy] = vect[kipy] + g4*vect[kipy] + g5*hxp[1] + g6*f2;
+ vout[kipz] = vect[kipz] + g4*vect[kipz] + g5*hxp[2] + g6*f3;
+
+ return;
+}
+//___________________________________________________________
+ void AliMUONTrackParam::GetField(Double_t *Position, Double_t *Field) const
+{
+ // interface for arguments in double precision (Why ? ChF)
+
+ Float_t x[3], b[3];
+
+ x[0] = Position[0]; x[1] = Position[1]; x[2] = Position[2];
+
+ fkField->Field(x, b);
+ Field[0] = b[0]; Field[1] = b[1]; Field[2] = b[2];
+
+ return;
+ }
+//_____________________________________________-
+void AliMUONTrackParam::Print(Option_t* opt) const
+{
+//
+ // Printing TrackParam information
+ // "full" option for printing all the information about the TrackParam
+ //
+ TString sopt(opt);
+ sopt.ToUpper();
+
+ if ( sopt.Contains("FULL") ) {
+ cout << "<AliMUONTrackParam> Bending P=" << setw(5) << setprecision(3) << 1./GetInverseBendingMomentum() <<
+ ", NonBendSlope=" << setw(5) << setprecision(3) << GetNonBendingSlope()*180./TMath::Pi() <<
+ ", BendSlope=" << setw(5) << setprecision(3) << GetBendingSlope()*180./TMath::Pi() <<
+ ", (x,y,z)_IP=(" << setw(5) << setprecision(3) << GetNonBendingCoor() <<
+ "," << setw(5) << setprecision(3) << GetBendingCoor() <<
+ "," << setw(5) << setprecision(3) << GetZ() <<
+ ") cm, (px,py,pz)=(" << setw(5) << setprecision(3) << Px() <<
+ "," << setw(5) << setprecision(3) << Py() <<
+ "," << setw(5) << setprecision(3) << Pz() << ") GeV/c" << endl;
+ }
+ else {
+ cout << "<AliMUONTrackParam>" << endl;
+ }
+
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff