VertexFitBField Class Reference

#include <BField.h>

List of all members.

Public Member Functions
	~VertexFitBField ()
double	getBFieldZ (const HepPoint3D &vtx)
double	getBFieldZRef ()
double	getCBz (const HepVector &vtx, const HepVector &trackPosition)
Static Public Member Functions
static VertexFitBField *	instance ()
Private Member Functions
	VertexFitBField ()
Private Attributes
IMagneticFieldSvc *	m_pIMF
Static Private Attributes
static VertexFitBField *	s_bfield = 0
static const double	alpha = -0.00299792458

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Detailed Description

Definition at line 22 of file BField.h.

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Constructor & Destructor Documentation

VertexFitBField::~VertexFitBField

(

)

[inline]

Definition at line 31 of file BField.h.

{}

VertexFitBField::VertexFitBField

(

)

[private]

Definition at line 22 of file BField.cxx.

References m_pIMF.

Referenced by instance().

                                 {
#ifndef BEAN
  ISvcLocator* svcLocator = Gaudi::svcLocator();
  m_pIMF = NULL;
  StatusCode sc = svcLocator->service("MagneticFieldSvc",m_pIMF);
  assert(m_pIMF != NULL);
  if (sc != StatusCode::SUCCESS) {
    std::cout << "ERROR : Unable to open Magnetic field service" << std::endl; 
//    assert(false);
  }
#else
  m_pIMF = MagneticFieldSvc::instance();
  assert( m_pIMF != 0 );
  if( (m_pIMF->GetPath()).empty() ) {
    cout << " VertexFitBField::ERROR "
        "You MUST set path to directory with magnetic fields tables" << endl;
    exit(1);
  }
  if( !m_pIMF->initialize() ) {
    cout << "ERROR : Can not initialize MagneticField. Stop." << endl;
    exit(1);
  }
#endif
}

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Member Function Documentation

double VertexFitBField::getBFieldZ

(

const HepPoint3D &

vtx

)

Definition at line 47 of file BField.cxx.

References abs, IMagneticFieldSvc::fieldVector(), IMagneticFieldSvc::getReferField(), and m_pIMF.

Referenced by HTrackParameter::center(), HTrackParameter::dHdp(), HTrackParameter::dHdx(), HTrackParameter::HTrackParameter(), HTrackParameter::positionTwoHelix(), and HTrackParameter::radius().

                                                        {
  HepVector3D vector(0.0, 0.0, 0.0);
  // fixed 2008-8-1
  double radius = sqrt(vtx.x()*vtx.x() + vtx.y()*vtx.y());
  if (radius < 150 && abs(vtx.z()) < 150) {
    m_pIMF->fieldVector(10.0*vtx, vector);
    return 1000 * vector.z();   //unit of m_BFieldZ is Tesla
  } else {
    return 1000 * m_pIMF->getReferField(); 
  }  
}

double VertexFitBField::getBFieldZRef

(

)

Definition at line 59 of file BField.cxx.

References IMagneticFieldSvc::getReferField(), and m_pIMF.

Referenced by FastVertexFit::addTrack(), and VFHelix::VFHelix().

                                      {
  return 1000 * m_pIMF->getReferField();
}

double VertexFitBField::getCBz	(	const HepVector &	vtx,
		const HepVector &	trackPosition
	)

Definition at line 63 of file BField.cxx.

References abs, alpha, IMagneticFieldSvc::fieldVector(), IMagneticFieldSvc::getReferField(), and m_pIMF.

Referenced by VertexFit::BuildVirtualParticle(), SecondVertexFit::Fit(), VertexFit::swimVertex(), VertexFit::UpdateConstraints(), and VertexConstraints::UpdateConstraints().

                                                                                   {
  HepPoint3D Vtx(vtx[0], vtx[1], vtx[2]);
  HepPoint3D TrkPosition(trackPosition[0], trackPosition[1], trackPosition[2]);

  HepVector3D vector_vtx(0.0, 0.0, 0.0);
  HepVector3D vector_trk(0.0, 0.0, 0.0);
  double radius = sqrt(vtx[0]*vtx[0] + vtx[1]*vtx[1]);
  if (radius < 150 && abs(vtx[2]) < 150) {
    m_pIMF->fieldVector(10.0*Vtx, vector_vtx);
    m_pIMF->fieldVector(10.0*TrkPosition, vector_trk);
    return 1000 * alpha * (vector_vtx.z() + vector_trk.z())/2;//unit of m_BFieldZ is Tesla
  } else {
    return 1000 * alpha* m_pIMF->getReferField();
  }
}

static VertexFitBField* VertexFitBField::instance

(

)

[inline, static]

Definition at line 24 of file BField.h.

References s_bfield, and VertexFitBField().

Referenced by FastVertexFit::addTrack(), VertexFit::BuildVirtualParticle(), HTrackParameter::center(), HTrackParameter::dHdp(), HTrackParameter::dHdx(), SecondVertexFit::Fit(), HTrackParameter::HTrackParameter(), HTrackParameter::positionTwoHelix(), HTrackParameter::radius(), VertexFit::swimVertex(), VertexFit::UpdateConstraints(), VertexConstraints::UpdateConstraints(), and VFHelix::VFHelix().

                                     {
    if (s_bfield == 0) {
      s_bfield = new VertexFitBField();
    }
    return s_bfield;
  }

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Member Data Documentation

const double VertexFitBField::alpha = -0.00299792458 [static, private]

Definition at line 48 of file BField.h.

Referenced by getCBz().

IMagneticFieldSvc* VertexFitBField::m_pIMF [private]

Definition at line 42 of file BField.h.

Referenced by getBFieldZ(), getBFieldZRef(), getCBz(), and VertexFitBField().

VertexFitBField * VertexFitBField::s_bfield = 0 [static, private]

Definition at line 47 of file BField.h.

Referenced by instance().

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