//
///////////////////////////////////////////////////
-//#include <Riostream.h>
-#include "AliMUON.h"
-#include "AliMUONTrackParam.h"
-//#include "AliMUONChamber.h"
-#include "AliRun.h"
-#include "AliMagF.h"
-#include "AliLog.h"
+#include <Riostream.h>
+#include "AliMUONTrackParam.h"
+#include "AliESDMuonTrack.h"
+#include "AliLog.h"
+#include "AliMUONHitForRec.h"
+
+/// \cond CLASSIMP
ClassImp(AliMUONTrackParam) // Class implementation in ROOT context
+/// \endcond
//_________________________________________________________________________
AliMUONTrackParam::AliMUONTrackParam()
- : TObject()
+ : TObject(),
+ fInverseBendingMomentum(0.),
+ fBendingSlope(0.),
+ fNonBendingSlope(0.),
+ fZ(0.),
+ fBendingCoor(0.),
+ fNonBendingCoor(0.),
+ fHitForRecPtr(0x0)
{
-// Constructor
+ /// Constructor
+}
- fInverseBendingMomentum = 0;
- fBendingSlope = 0;
- fNonBendingSlope = 0;
- fZ = 0;
- fBendingCoor = 0;
- fNonBendingCoor = 0;
+ //_________________________________________________________________________
+AliMUONTrackParam::AliMUONTrackParam(const AliMUONTrackParam& theMUONTrackParam)
+ : TObject(theMUONTrackParam),
+ fInverseBendingMomentum(theMUONTrackParam.fInverseBendingMomentum),
+ fBendingSlope(theMUONTrackParam.fBendingSlope),
+ fNonBendingSlope(theMUONTrackParam.fNonBendingSlope),
+ fZ(theMUONTrackParam.fZ),
+ fBendingCoor(theMUONTrackParam.fBendingCoor),
+ fNonBendingCoor(theMUONTrackParam.fNonBendingCoor),
+ fHitForRecPtr(theMUONTrackParam.fHitForRecPtr)
+{
+ /// Copy constructor
}
//_________________________________________________________________________
-AliMUONTrackParam&
-AliMUONTrackParam::operator=(const AliMUONTrackParam& theMUONTrackParam)
+AliMUONTrackParam& AliMUONTrackParam::operator=(const AliMUONTrackParam& theMUONTrackParam)
{
- // Asignment operator
+ /// Asignment operator
if (this == &theMUONTrackParam)
return *this;
fZ = theMUONTrackParam.fZ;
fBendingCoor = theMUONTrackParam.fBendingCoor;
fNonBendingCoor = theMUONTrackParam.fNonBendingCoor;
+ fHitForRecPtr = theMUONTrackParam.fHitForRecPtr;
return *this;
}
- //_________________________________________________________________________
-AliMUONTrackParam::AliMUONTrackParam(const AliMUONTrackParam& theMUONTrackParam)
- : TObject(theMUONTrackParam)
-{
- // Copy constructor
- fInverseBendingMomentum = theMUONTrackParam.fInverseBendingMomentum;
- fBendingSlope = theMUONTrackParam.fBendingSlope;
- fNonBendingSlope = theMUONTrackParam.fNonBendingSlope;
- fZ = theMUONTrackParam.fZ;
- fBendingCoor = theMUONTrackParam.fBendingCoor;
- fNonBendingCoor = theMUONTrackParam.fNonBendingCoor;
-}
-
- //__________________________________________________________________________
-void AliMUONTrackParam::ExtrapToZ(Double_t Z)
-{
- // Track parameter extrapolation to the plane at "Z".
- // On return, the track parameters resulting from the extrapolation
- // replace the current track parameters.
- if (this->fZ == Z) return; // nothing to be done if same Z
- Double_t forwardBackward; // +1 if forward, -1 if backward
- if (Z < this->fZ) forwardBackward = 1.0; // spectro. z<0
- else forwardBackward = -1.0;
- Double_t vGeant3[7], vGeant3New[7]; // 7 in parameter ????
- Int_t iGeant3, stepNumber;
- Int_t maxStepNumber = 5000; // in parameter ????
- // For safety: return kTRUE or kFALSE ????
- // Parameter vector for calling EXTRAP_ONESTEP
- SetGeant3Parameters(vGeant3, forwardBackward);
- // sign of charge (sign of fInverseBendingMomentum if forward motion)
- // must be changed if backward extrapolation
- Double_t chargeExtrap = forwardBackward *
- TMath::Sign(Double_t(1.0), this->fInverseBendingMomentum);
- Double_t stepLength = 6.0; // in parameter ????
- // Extrapolation loop
- stepNumber = 0;
- while (((-forwardBackward * (vGeant3[2] - Z)) <= 0.0) && // spectro. z<0
- (stepNumber < maxStepNumber)) {
- stepNumber++;
- // Option for switching between helix and Runge-Kutta ????
- //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++)
- {vGeant3[iGeant3] = vGeant3New[iGeant3];}
- }
- // check maxStepNumber ????
- // 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
- // Track parameters from Geant3 parameters,
- // with charge back for forward motion
- GetFromGeant3Parameters(vGeant3, chargeExtrap * forwardBackward);
-}
//__________________________________________________________________________
-void AliMUONTrackParam::SetGeant3Parameters(Double_t *VGeant3, Double_t ForwardBackward)
+AliMUONTrackParam::~AliMUONTrackParam()
{
- // Set vector of Geant3 parameters pointed to by "VGeant3"
- // from track parameters in current AliMUONTrackParam.
- // Since AliMUONTrackParam is only geometry, one uses "ForwardBackward"
- // to know whether the particle is going forward (+1) or backward (-1).
- VGeant3[0] = this->fNonBendingCoor; // X
- VGeant3[1] = this->fBendingCoor; // Y
- VGeant3[2] = this->fZ; // Z
- Double_t pYZ = TMath::Abs(1.0 / this->fInverseBendingMomentum);
- Double_t pZ =
- pYZ / TMath::Sqrt(1.0 + this->fBendingSlope * this->fBendingSlope);
- VGeant3[6] =
- TMath::Sqrt(pYZ * pYZ +
- pZ * pZ * this->fNonBendingSlope * this->fNonBendingSlope); // PTOT
- VGeant3[5] = -ForwardBackward * pZ / VGeant3[6]; // PZ/PTOT spectro. z<0
- VGeant3[3] = this->fNonBendingSlope * VGeant3[5]; // PX/PTOT
- VGeant3[4] = this->fBendingSlope * VGeant3[5]; // PY/PTOT
+/// Destructor
+/// Update the number of TrackHit's connected to the attached HitForRec if any
+ if (fHitForRecPtr) fHitForRecPtr->SetNTrackHits(fHitForRecPtr->GetNTrackHits() - 1); // decrement NTrackHits of hit
}
//__________________________________________________________________________
-void AliMUONTrackParam::GetFromGeant3Parameters(Double_t *VGeant3, Double_t Charge)
+void AliMUONTrackParam::SetTrackParam(AliMUONTrackParam& theMUONTrackParam)
{
- // Get track parameters in current AliMUONTrackParam
- // from Geant3 parameters pointed to by "VGeant3",
- // assumed to be calculated for forward motion in Z.
- // "InverseBendingMomentum" is signed with "Charge".
- this->fNonBendingCoor = VGeant3[0]; // X
- this->fBendingCoor = VGeant3[1]; // Y
- this->fZ = VGeant3[2]; // Z
- Double_t pYZ = VGeant3[6] * TMath::Sqrt(1.0 - VGeant3[3] * VGeant3[3]);
- this->fInverseBendingMomentum = Charge / pYZ;
- this->fBendingSlope = VGeant3[4] / VGeant3[5];
- this->fNonBendingSlope = VGeant3[3] / VGeant3[5];
+ /// Set track parameters from "TrackParam" leaving pointer to fHitForRecPtr unchanged
+ fInverseBendingMomentum = theMUONTrackParam.fInverseBendingMomentum;
+ fBendingSlope = theMUONTrackParam.fBendingSlope;
+ fNonBendingSlope = theMUONTrackParam.fNonBendingSlope;
+ fZ = theMUONTrackParam.fZ;
+ fBendingCoor = theMUONTrackParam.fBendingCoor;
+ fNonBendingCoor = theMUONTrackParam.fNonBendingCoor;
+
}
//__________________________________________________________________________
-void AliMUONTrackParam::ExtrapToStation(Int_t Station, AliMUONTrackParam *TrackParam)
+AliMUONHitForRec* AliMUONTrackParam::GetHitForRecPtr(void) const
{
- // Track parameters extrapolated from current track parameters ("this")
- // to both chambers of the station(0..) "Station"
- // are returned in the array (dimension 2) of track parameters
- // 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
- // 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 {
- AliError(Form("Starting Z (%f) in between z1 (%f) and z2 (%f) of station(0..)%d",this->fZ,z1,z2,Station));
-// cout << "ERROR in AliMUONTrackParam::CreateExtrapSegmentInStation" << endl;
-// cout << "Starting Z (" << this->fZ << ") in between z1 (" << z1 <<
-// ") and z2 (" << z2 << ") of station(0..) " << Station << endl;
- }
- extZ[i1] = z1;
- extZ[i2] = z2;
- // copy of track parameters
- TrackParam[i1] = *this;
- // first extrapolation
- (&(TrackParam[i1]))->ExtrapToZ(extZ[0]);
- TrackParam[i2] = TrackParam[i1];
- // second extrapolation
- (&(TrackParam[i2]))->ExtrapToZ(extZ[1]);
- return;
+/// return pointer to HitForRec attached to the current TrackParam
+/// this method should not be called when fHitForRecPtr == NULL
+ if (!fHitForRecPtr) AliWarning("AliMUONTrackParam::GetHitForRecPtr: fHitForRecPtr == NULL");
+ return fHitForRecPtr;
}
//__________________________________________________________________________
-void AliMUONTrackParam::ExtrapToVertex(Double_t xVtx, Double_t yVtx, Double_t zVtx)
+Int_t AliMUONTrackParam::Compare(const TObject* TrackParam) const
{
- // Extrapolation to the vertex.
- // Returns the track parameters resulting from the extrapolation,
- // in the current TrackParam.
- // Changes parameters according to Branson correction through the absorber
-
- Double_t zAbsorber = -503.0; // to be coherent with the Geant absorber geometry !!!!
- // spectro. (z<0)
- // Extrapolates track parameters upstream to the "Z" end of the front absorber
- ExtrapToZ(zAbsorber); // !!!
- // Makes Branson correction (multiple scattering + energy loss)
- BransonCorrection(xVtx,yVtx,zVtx);
- // Makes a simple magnetic field correction through the absorber
- FieldCorrection(zAbsorber);
+/// "Compare" function to sort with decreasing Z (spectro. muon Z <0).
+/// Returns 1 (0, -1) if Z of current TrackHit
+/// is smaller than (equal to, larger than) Z of TrackHit
+ if (fHitForRecPtr->GetZ() < ((AliMUONTrackParam*)TrackParam)->fHitForRecPtr->GetZ()) return(1);
+ else if (fHitForRecPtr->GetZ() == ((AliMUONTrackParam*)TrackParam)->fHitForRecPtr->GetZ()) return(0);
+ else return(-1);
}
-
-// Keep this version for future developments
- //__________________________________________________________________________
-// void AliMUONTrackParam::BransonCorrection()
-// {
-// // Branson correction of track parameters
-// // the entry parameters have to be calculated at the end of the absorber
-// Double_t zEndAbsorber, zBP, xBP, yBP;
-// Double_t pYZ, pX, pY, pZ, pTotal, xEndAbsorber, yEndAbsorber, radiusEndAbsorber2, pT, theta;
-// Int_t sign;
-// // Would it be possible to calculate all that from Geant configuration ????
-// // and to get the Branson parameters from a function in ABSO module ????
-// // with an eventual contribution from other detectors like START ????
-// // Radiation lengths outer part theta > 3 degres
-// static Double_t x01[9] = { 18.8, // C (cm)
-// 10.397, // Concrete (cm)
-// 0.56, // Plomb (cm)
-// 47.26, // Polyethylene (cm)
-// 0.56, // Plomb (cm)
-// 47.26, // Polyethylene (cm)
-// 0.56, // Plomb (cm)
-// 47.26, // Polyethylene (cm)
-// 0.56 }; // Plomb (cm)
-// // inner part theta < 3 degres
-// static Double_t x02[3] = { 18.8, // C (cm)
-// 10.397, // Concrete (cm)
-// 0.35 }; // W (cm)
-// // z positions of the materials inside the absober outer part theta > 3 degres
-// static Double_t z1[10] = { 90, 315, 467, 472, 477, 482, 487, 492, 497, 502 };
-// // inner part theta < 3 degres
-// static Double_t z2[4] = { 90, 315, 467, 503 };
-// static Bool_t first = kTRUE;
-// static Double_t zBP1, zBP2, rLimit;
-// // Calculates z positions of the Branson's planes: zBP1 for outer part and zBP2 for inner part (only at the first call)
-// if (first) {
-// first = kFALSE;
-// Double_t aNBP = 0.0;
-// Double_t aDBP = 0.0;
-// Int_t iBound;
-
-// for (iBound = 0; iBound < 9; iBound++) {
-// aNBP = aNBP +
-// (z1[iBound+1] * z1[iBound+1] * z1[iBound+1] -
-// z1[iBound] * z1[iBound] * z1[iBound] ) / x01[iBound];
-// aDBP = aDBP +
-// (z1[iBound+1] * z1[iBound+1] - z1[iBound] * z1[iBound] ) / x01[iBound];
-// }
-// zBP1 = (2.0 * aNBP) / (3.0 * aDBP);
-// aNBP = 0.0;
-// aDBP = 0.0;
-// for (iBound = 0; iBound < 3; iBound++) {
-// aNBP = aNBP +
-// (z2[iBound+1] * z2[iBound+1] * z2[iBound+1] -
-// z2[iBound] * z2[iBound ] * z2[iBound] ) / x02[iBound];
-// aDBP = aDBP +
-// (z2[iBound+1] * z2[iBound+1] - z2[iBound] * z2[iBound]) / x02[iBound];
-// }
-// zBP2 = (2.0 * aNBP) / (3.0 * aDBP);
-// rLimit = z2[3] * TMath::Tan(3.0 * (TMath::Pi()) / 180.);
-// }
-
-// pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
-// sign = 1;
-// if (fInverseBendingMomentum < 0) sign = -1;
-// pZ = pYZ / (TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope));
-// pX = pZ * fNonBendingSlope;
-// pY = pZ * fBendingSlope;
-// pTotal = TMath::Sqrt(pYZ *pYZ + pX * pX);
-// xEndAbsorber = fNonBendingCoor;
-// yEndAbsorber = fBendingCoor;
-// radiusEndAbsorber2 = xEndAbsorber * xEndAbsorber + yEndAbsorber * yEndAbsorber;
-
-// if (radiusEndAbsorber2 > rLimit*rLimit) {
-// zEndAbsorber = z1[9];
-// zBP = zBP1;
-// } else {
-// zEndAbsorber = z2[3];
-// zBP = zBP2;
-// }
-
-// xBP = xEndAbsorber - (pX / pZ) * (zEndAbsorber - zBP);
-// yBP = yEndAbsorber - (pY / pZ) * (zEndAbsorber - zBP);
-
-// // new parameters after Branson and energy loss corrections
-// pZ = pTotal * zBP / TMath::Sqrt(xBP * xBP + yBP * yBP + zBP * zBP);
-// pX = pZ * xBP / zBP;
-// pY = pZ * yBP / zBP;
-// fBendingSlope = pY / pZ;
-// fNonBendingSlope = pX / pZ;
-
-// pT = TMath::Sqrt(pX * pX + pY * pY);
-// theta = TMath::ATan2(pT, pZ);
-// pTotal =
-// TotalMomentumEnergyLoss(rLimit, pTotal, theta, xEndAbsorber, yEndAbsorber);
-
-// fInverseBendingMomentum = (sign / pTotal) *
-// TMath::Sqrt(1.0 +
-// fBendingSlope * fBendingSlope +
-// fNonBendingSlope * fNonBendingSlope) /
-// TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope);
-
-// // vertex position at (0,0,0)
-// // should be taken from vertex measurement ???
-// fBendingCoor = 0.0;
-// fNonBendingCoor = 0;
-// fZ= 0;
-// }
-
-void AliMUONTrackParam::BransonCorrection(Double_t xVtx,Double_t yVtx,Double_t zVtx)
+ //_________________________________________________________________________
+void AliMUONTrackParam::GetParamFrom(const AliESDMuonTrack& esdMuonTrack)
{
- // Branson correction of track parameters
- // the entry parameters have to be calculated at the end of the absorber
- // simplified version: the z positions of Branson's planes are no longer calculated
- // but are given as inputs. One can use the macros MUONTestAbso.C and DrawTestAbso.C
- // to test this correction.
- // Would it be possible to calculate all that from Geant configuration ????
- // and to get the Branson parameters from a function in ABSO module ????
- // with an eventual contribution from other detectors like START ????
- //change to take into account the vertex postition (real, reconstruct,....)
-
- Double_t zBP, xBP, yBP;
- Double_t pYZ, pX, pY, pZ, pTotal, xEndAbsorber, yEndAbsorber, radiusEndAbsorber2, pT, theta;
- Int_t sign;
- static Bool_t first = kTRUE;
- static Double_t zBP1, zBP2, rLimit, thetaLimit, zEndAbsorber;
- // zBP1 for outer part and zBP2 for inner part (only at the first call)
- if (first) {
- first = kFALSE;
-
- zEndAbsorber = -503; // spectro (z<0)
- thetaLimit = 3.0 * (TMath::Pi()) / 180.;
- rLimit = TMath::Abs(zEndAbsorber) * TMath::Tan(thetaLimit);
- zBP1 = -450; // values close to those calculated with EvalAbso.C
- zBP2 = -480;
- }
-
- pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
- sign = 1;
- if (fInverseBendingMomentum < 0) sign = -1;
- pZ = Pz();
- pX = Px();
- pY = Py();
- pTotal = TMath::Sqrt(pYZ *pYZ + pX * pX);
- xEndAbsorber = fNonBendingCoor;
- yEndAbsorber = fBendingCoor;
- radiusEndAbsorber2 = xEndAbsorber * xEndAbsorber + yEndAbsorber * yEndAbsorber;
-
- if (radiusEndAbsorber2 > rLimit*rLimit) {
- zBP = zBP1;
- } else {
- zBP = zBP2;
- }
-
- xBP = xEndAbsorber - (pX / pZ) * (zEndAbsorber - zBP);
- yBP = yEndAbsorber - (pY / pZ) * (zEndAbsorber - zBP);
-
- // new parameters after Branson and energy loss corrections
-// Float_t zSmear = zBP - gRandom->Gaus(0.,2.); // !!! possible smearing of Z vertex position
-
- Float_t zSmear = zBP ;
-
- pZ = pTotal * (zSmear-zVtx) / TMath::Sqrt((xBP-xVtx) * (xBP-xVtx) + (yBP-yVtx) * (yBP-yVtx) +( zSmear-zVtx) * (zSmear-zVtx) );
- pX = pZ * (xBP - xVtx)/ (zSmear-zVtx);
- pY = pZ * (yBP - yVtx) / (zSmear-zVtx);
- fBendingSlope = pY / pZ;
- fNonBendingSlope = pX / pZ;
-
-
- pT = TMath::Sqrt(pX * pX + pY * pY);
- theta = TMath::ATan2(pT, TMath::Abs(pZ));
- pTotal = TotalMomentumEnergyLoss(thetaLimit, pTotal, theta);
-
- fInverseBendingMomentum = (sign / pTotal) *
- TMath::Sqrt(1.0 +
- fBendingSlope * fBendingSlope +
- fNonBendingSlope * fNonBendingSlope) /
- TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope);
-
- // vertex position at (0,0,0)
- // should be taken from vertex measurement ???
-
- fBendingCoor = xVtx;
- fNonBendingCoor = yVtx;
- fZ= zVtx;
-
+ /// 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();
}
- //__________________________________________________________________________
-Double_t AliMUONTrackParam::TotalMomentumEnergyLoss(Double_t thetaLimit, Double_t pTotal, Double_t theta)
+ //_________________________________________________________________________
+void AliMUONTrackParam::SetParamFor(AliESDMuonTrack& esdMuonTrack)
{
- // Returns the total momentum corrected from energy loss in the front absorber
- // One can use the macros MUONTestAbso.C and DrawTestAbso.C
- // to test this correction.
- // Momentum energy loss behaviour evaluated with the simulation of single muons (april 2002)
- Double_t deltaP, pTotalCorrected;
-
- // Parametrization to be redone according to change of absorber material ????
- // See remark in function BransonCorrection !!!!
- // The name is not so good, and there are many arguments !!!!
- if (theta < thetaLimit ) {
- if (pTotal < 20) {
- deltaP = 2.5938 + 0.0570 * pTotal - 0.001151 * pTotal * pTotal;
- } else {
- deltaP = 3.0714 + 0.011767 *pTotal;
- }
- } else {
- if (pTotal < 20) {
- deltaP = 2.1207 + 0.05478 * pTotal - 0.00145079 * pTotal * pTotal;
- } else {
- deltaP = 2.6069 + 0.0051705 * pTotal;
- }
- }
- pTotalCorrected = pTotal + deltaP / TMath::Cos(theta);
- return pTotalCorrected;
+ /// 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);
}
//__________________________________________________________________________
-void AliMUONTrackParam::FieldCorrection(Double_t Z)
+Double_t AliMUONTrackParam::Px() const
{
- //
- // Correction of the effect of the magnetic field in the absorber
- // Assume a constant field along Z axis.
-
- Float_t b[3],x[3];
- Double_t bZ;
- Double_t pYZ,pX,pY,pZ,pT;
- Double_t pXNew,pYNew;
- Double_t c;
-
- pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
- c = TMath::Sign(1.0,fInverseBendingMomentum); // particle charge
-
- pZ = Pz();
- pX = Px();
- pY = Py();
- pT = TMath::Sqrt(pX*pX+pY*pY);
-
- if (TMath::Abs(pZ) <= 0) return;
- x[2] = Z/2;
- x[0] = x[2]*fNonBendingSlope;
- x[1] = x[2]*fBendingSlope;
-
- // Take magn. field value at position x.
- gAlice->Field()->Field(x, b);
- bZ = b[2];
-
- // Transverse momentum rotation
- // Parameterized with the study of DeltaPhi = phiReco - phiGen as a function of pZ.
- Double_t phiShift = c*0.436*0.0003*bZ*Z/pZ;
- // Rotate momentum around Z axis.
- pXNew = pX*TMath::Cos(phiShift) - pY*TMath::Sin(phiShift);
- pYNew = pX*TMath::Sin(phiShift) + pY*TMath::Cos(phiShift);
-
- fBendingSlope = pYNew / pZ;
- fNonBendingSlope = pXNew / pZ;
-
- fInverseBendingMomentum = c / TMath::Sqrt(pYNew*pYNew+pZ*pZ);
-
-}
- //__________________________________________________________________________
-Double_t AliMUONTrackParam::Px()
-{
- // return px from track paramaters
+ /// return px from track paramaters
Double_t pYZ, pZ, pX;
pYZ = 0;
if ( TMath::Abs(fInverseBendingMomentum) > 0 )
pX = pZ * fNonBendingSlope;
return pX;
}
+
//__________________________________________________________________________
-Double_t AliMUONTrackParam::Py()
+Double_t AliMUONTrackParam::Py() const
{
- // return px from track paramaters
+ /// return px from track paramaters
Double_t pYZ, pZ, pY;
pYZ = 0;
if ( TMath::Abs(fInverseBendingMomentum) > 0 )
pY = pZ * fBendingSlope;
return pY;
}
+
//__________________________________________________________________________
-Double_t AliMUONTrackParam::Pz()
+Double_t AliMUONTrackParam::Pz() const
{
- // return px from track paramaters
+ /// return px from track paramaters
Double_t pYZ, pZ;
pYZ = 0;
if ( TMath::Abs(fInverseBendingMomentum) > 0 )
pZ = -pYZ / (TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope)); // spectro. (z<0)
return pZ;
}
+
//__________________________________________________________________________
-Double_t AliMUONTrackParam::P()
+Double_t AliMUONTrackParam::P() const
{
- // return p from track paramaters
+ /// return p from track paramaters
Double_t pYZ, pZ, p;
pYZ = 0;
if ( TMath::Abs(fInverseBendingMomentum) > 0 )
return p;
}
- //__________________________________________________________________________
-void AliMUONTrackParam::ExtrapOneStepHelix(Double_t charge, Double_t step,
- Double_t *vect, Double_t *vout)
-{
-// ******************************************************************
-// * *
-// * 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)
-{
-//
-// ******************************************************************
-// * *
-// * 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)
-{
-//
-// ******************************************************************
-// * *
-// * 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;
+//_____________________________________________-
+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;
+ }
- 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)
-{
- // 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];
-
- return;
- }
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff