Trk::JacobianPerigeeToCartesian Class Reference

Jacobian for transforming perigee track parameters \((d_0, z_0, \phi_0, \theta, q/p)\) to the cartesian frame \((p_x,p_y,p_z,E,x,y,z)\). More...

#include <JacobianPerigeeToCartesian.h>

Inheritance diagram for Trk::JacobianPerigeeToCartesian:

Collaboration diagram for Trk::JacobianPerigeeToCartesian:

Public Member Functions
	JacobianPerigeeToCartesian (const double d0, const double z0, const double phi0, const double theta, const double qOverP, const double mass=ParticleConstants::muonMassInMeV)
	~JacobianPerigeeToCartesian ()

Detailed Description

Jacobian for transforming perigee track parameters \((d_0, z_0, \phi_0, \theta, q/p)\) to the cartesian frame \((p_x,p_y,p_z,E,x,y,z)\).

It needs a mass in order to calculate the energy, default is muon-mass.

Author

Maaik.nosp@m.e.Li.nosp@m.mper@.nosp@m.cern.nosp@m..ch

Definition at line 29 of file JacobianPerigeeToCartesian.h.

Constructor & Destructor Documentation

JacobianPerigeeToCartesian()

Trk::JacobianPerigeeToCartesian::JacobianPerigeeToCartesian	(	const double	d0,
		const double	z0,
		const double	phi0,
		const double	theta,
		const double	qOverP,
		const double	mass = ParticleConstants::muonMassInMeV )

Definition at line 12 of file JacobianPerigeeToCartesian.cxx.

                                                                               :
  AmgMatrix(7,5)()
{
 
  // initialize to zero
  this->setZero();
 
  double sinp = std::sin(phi0);
  double cosp = std::cos(phi0);
  double sint = std::sin(theta);
  double cost = std::cos(theta);
  double rho  = std::fabs(qOverP);
  int charge=+1;
  if(qOverP<0) { charge = -1;}
 
  // transformation of track parameters
  double px = cosp*sint/rho;
  double py = sinp*sint/rho;
  double pz = cost/rho;
  double E = std::sqrt(1/rho/rho+mass*mass);
  
  // I don't need this
  //double x = xref[0] - d0*sinp;
  //double y = xref[1] + d0*cosp;
  //double z = xref[2] + z0;
 
  (*this)(0,2) = -py; // dpx/dphi0
  (*this)(0,3) =  pz*cosp; // dpx/dtheta
  (*this)(0,4) = -charge*px/rho; // dpx/dqOverP  
  (*this)(1,2) =  px; // dpy/dphi0
  (*this)(1,3) =  pz*sinp; // dpy/dtheta
  (*this)(1,4) = -charge*py/rho; // dpy/dqOverP  
  (*this)(2,3) = -sint/rho; // dpz/dtheta
  (*this)(2,4) = -charge*pz/rho; // dpz/dqOverP  
  (*this)(3,4) = -charge*1./(E*rho*rho*rho); // dE/dqOverP  
  (*this)(4,0) = -sinp; // dx/dd0
  (*this)(4,2) = -d0*cosp; // dx/dphi0  
  (*this)(5,0) = +cosp; // dy/dd0
  (*this)(5,2) = -d0*sinp; // dy/dphi0
  (*this)(6,1) = 1.; //dz/dz0
 
}

~JacobianPerigeeToCartesian()

Trk::JacobianPerigeeToCartesian::~JacobianPerigeeToCartesian ( )

inline

Definition at line 32 of file JacobianPerigeeToCartesian.h.

{}

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The documentation for this class was generated from the following files:

• JacobianPerigeeToCartesian.h
• JacobianPerigeeToCartesian.cxx