CylindricalState Class Reference

#include <CylindricalState.h>

List of all members.

Public Types
typedef double	Scalar
typedef RKSmallVector< Scalar, 5 >	Vector
Public Member Functions
Scalar	charge () const
	CylindricalState (const LocalPoint &pos, const LocalVector &mom, Scalar ch)
	CylindricalState ()
	CylindricalState (Scalar rho, const Vector &par, Scalar prSign)
const LocalVector	momentum () const
const Vector &	parameters () const
const LocalPoint	position () const
double	prSign () const
Scalar	rho () const
Private Attributes
Vector	par_
Scalar	prSign_
	sign of local p_r
Scalar	rho_

---

Detailed Description

State for solving the equation of motion with radius (in cylindrical coordinates) as free variable. The dependent variables are phi - azimuthal angle z - z coordinate dphi/dr - derivative of phi versus r dz/dr - derivative of z versus r q/p - charge over momentum magnitude

The coordinate system is externally defined

Definition at line 21 of file CylindricalState.h.

---

Member Typedef Documentation

typedef double CylindricalState::Scalar

Definition at line 24 of file CylindricalState.h.

typedef RKSmallVector<Scalar,5> CylindricalState::Vector

Definition at line 25 of file CylindricalState.h.

---

Constructor & Destructor Documentation

CylindricalState::CylindricalState

(

)

[inline]

Definition at line 27 of file CylindricalState.h.

{}

CylindricalState::CylindricalState	(	const LocalPoint &	pos,
		const LocalVector &	mom,
		Scalar	ch
	)		[inline]

Definition at line 29 of file CylindricalState.h.

References DeDxDiscriminatorTools::charge(), gather_cfg::cout, PV3DBase< T, PVType, FrameType >::mag(), PV3DBase< T, PVType, FrameType >::perp(), PV3DBase< T, PVType, FrameType >::phi(), position, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

                                                                              {
      rho_ = pos.perp();
      Scalar cosphi = pos.x() / rho_;
      Scalar sinphi = pos.y() / rho_;
      Scalar p_rho   =  mom.x() * cosphi + mom.y() * sinphi;
      Scalar p_phi   = -mom.x() * sinphi + mom.y() * cosphi;

      par_(0) = pos.phi();
      par_(1) = pos.z();
      par_(2) = p_phi / (p_rho * rho_);
      par_(3) = mom.z() / p_rho;
      par_(4) = ch / mom.mag();

      prSign_ = p_rho > 0 ? 1.0 : -1.0;

      std::cout << "CylindricalState built from pos " << pos << " mom " << mom << " charge " << ch << std::endl;
      std::cout << "p_rho " << p_rho << " p_phi " << p_phi << " dphi_drho " << par_(2) << std::endl;
      std::cout << "Which results in                " << position() << " mom " << momentum() 
           << " charge " << charge() << std::endl;
  }

CylindricalState::CylindricalState	(	Scalar	rho,
		const Vector &	par,
		Scalar	prSign
	)		[inline]

Definition at line 50 of file CylindricalState.h.

                                                                  :
      par_(par), rho_(rho), prSign_(prSign) {}

---

Member Function Documentation

Scalar CylindricalState::charge

(

void

)

const [inline]

Definition at line 74 of file CylindricalState.h.

{ return par_(4) > 0 ? 1 : -1;}

const LocalVector CylindricalState::momentum

(

)

const [inline]

Definition at line 58 of file CylindricalState.h.

References abs, funct::cos(), P, query::result, funct::sin(), and mathSSE::sqrt().

                                     {
      Scalar cosphi = cos( par_(0));
      Scalar sinphi = sin( par_(0));
      Scalar Q = sqrt(1 + rho_*rho_ * par_(2)*par_(2) + par_(3)*par_(3));
      Scalar P = std::abs(1./par_(4));
      Scalar p_rho = prSign_*P/Q;
      Scalar p_phi = rho_*par_(2)*p_rho;
      Scalar p_z   = par_(3)*p_rho;
      LocalVector result( p_rho*cosphi - p_phi*sinphi,
                          p_rho*sinphi + p_phi*cosphi,
                          p_z);
      return result;
  }

const Vector& CylindricalState::parameters

(

void

)

const [inline]

Definition at line 72 of file CylindricalState.h.

Referenced by RKPropagatorInR::propagate().

{ return par_;}

const LocalPoint CylindricalState::position

(

void

)

const [inline]

Definition at line 54 of file CylindricalState.h.

                                    { 
      return LocalPoint( LocalPoint::Cylindrical( rho_, par_(0), par_(1)));
  }

double CylindricalState::prSign

(

)

const [inline]

Definition at line 78 of file CylindricalState.h.

{return prSign_;}

Scalar CylindricalState::rho

(

)

const [inline]

Definition at line 76 of file CylindricalState.h.

{return rho_;}

---

Member Data Documentation

Vector CylindricalState::par_ [private]

Definition at line 82 of file CylindricalState.h.

Scalar CylindricalState::prSign_ [private]

sign of local p_r

Definition at line 84 of file CylindricalState.h.

Scalar CylindricalState::rho_ [private]

Definition at line 83 of file CylindricalState.h.