BeamParametersFitter Class Reference

Fitter calculating BeamParameters from CollisionBoostVector and CollisionInvariantMass. More...

#include <BeamParametersFitter.h>

Collaboration diagram for BeamParametersFitter:

Public Member Functions
	BeamParametersFitter ()
	Constructor.
	~BeamParametersFitter ()
	Destructor.
void	setIntervalOfValidity (const IntervalOfValidity &iov)
	Set interval of validity.
void	setAngleHER (double angleHER)
	Set HER angle.
void	setAngleLER (double angleLER)
	Set LER angle.
void	setAngleError (double angleError)
	Set angle error.
void	setBoostError (double boostError)
	Set boost error.
void	setInvariantMassError (double invariantMassError)
	Set invariant-mass error.
void	useMomentum (bool use)
	Set whether to use momentum components or energy and two angles.
void	setVerbose (bool verbose)
	Set whether to be verbose (print Minuit output).
BeamParameters	getBeamParameters () const
	Get beam parameters.
void	setBeamParameters (const BeamParameters *beamParameters)
	Set beam parameters.
void	fit ()
	Perform the fit.
void	fillVertexData (double covarianceXX, double covarianceYY)
	Fill beam spot (vertex) data. More...
void	importBeamParameters ()
	Import beam parameters.

Protected Member Functions
void	setupDatabase ()
	Setup database.

Protected Attributes
IntervalOfValidity	m_IntervalOfValidity
	Interval of validity.
double	m_AngleHER = 0
	HER angle.
double	m_AngleLER = 0
	LER angle.
double	m_AngleError = 0
	Angle error.
double	m_BoostError = 0.0001
	Boost error (use only if inverse error matrix is not available).
double	m_InvariantMassError = 0.0001
	Invariant-mass error (use only if error is 0).
bool	m_UseMomentum = false
	Whether to use momentum components or energy and two angles.
bool	m_Verbose = false
	Whether to be verbose (print Minuit output).
BeamParameters	m_BeamParameters
	Beam parameters.
DBObjPtr< BeamSpot >	m_BeamSpot
	Beam spot.
DBObjPtr< CollisionBoostVector >	m_CollisionBoostVector
	Collision boost vector.
DBObjPtr< CollisionInvariantMass >	m_CollisionInvariantMass
	Collision invariant mass.

Detailed Description

Fitter calculating BeamParameters from CollisionBoostVector and CollisionInvariantMass.

Definition at line 41 of file BeamParametersFitter.h.

Member Function Documentation

fillVertexData()

void fillVertexData	(	double	covarianceXX,
		double	covarianceYY
	)

Fill beam spot (vertex) data.

The covariance matrix is rescaled to nominal XX and YY covariances. If covariances are negative, then no rescaling is performed.

Parameters

[in]	covarianceXX	Covariance-matrix XX element.
[in]	covarianceYY	Covariance-matrix YY element.

Definition at line 316 of file BeamParametersFitter.cc.

{
  setupDatabase();
  m_BeamParameters.setVertex(m_BeamSpot->getIPPosition());
  TMatrixDSym beamSize = m_BeamSpot->getSizeCovMatrix();
  double xScale, yScale;
  if (covarianceXX < 0)
    xScale = 1;
  else
    xScale = sqrt(covarianceXX / beamSize[0][0]);
  if (covarianceYY < 0)
    yScale = 1;
  else
    yScale = sqrt(covarianceYY / beamSize[1][1]);
  for (int i = 0; i < 3; ++i) {
    beamSize[0][i] *= xScale;
    beamSize[i][0] *= xScale;
    beamSize[1][i] *= yScale;
    beamSize[i][1] *= yScale;
  }
  m_BeamParameters.setCovVertex(beamSize);
}

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

• mdst/calibration/include/BeamParametersFitter.h
• mdst/calibration/src/BeamParametersFitter.cc