MassKinematicConstraint Class Reference

#include <MassKinematicConstraint.h>

Inheritance diagram for MassKinematicConstraint:

Public Member Functions
MassKinematicConstraint *	clone () const override
std::pair< AlgebraicMatrix, AlgebraicVector >	derivative (const AlgebraicVector &exPoint) const override
std::pair< AlgebraicMatrix, AlgebraicVector >	derivative (const std::vector< RefCountedKinematicParticle > &par) const override
AlgebraicVector	deviations (int nStates) const override
	MassKinematicConstraint (const ParticleMass &m, const float sigma)
int	numberOfEquations () const override
std::pair< AlgebraicVector, AlgebraicVector >	value (const AlgebraicVector &exPoint) const override
std::pair< AlgebraicVector, AlgebraicVector >	value (const std::vector< RefCountedKinematicParticle > &par) const override
Public Member Functions inherited from KinematicConstraint
	KinematicConstraint ()
virtual	~KinematicConstraint ()

Private Attributes
AlgebraicVector	dd
ParticleMass	mass

Detailed Description

Mass track constraint class. Provides a way to compute derivative matrix and vector of values for mass constraint on the single trajectory. This class does not have the multistate version, since vertex definition needed to calculate a joint mass of several particles.

Kirill Prokofiev December 2002 Multitrack interface: July 2004

Definition at line 17 of file MassKinematicConstraint.h.

Constructor & Destructor Documentation

MassKinematicConstraint()

MassKinematicConstraint::MassKinematicConstraint	(	const ParticleMass &	m,
		const float	sigma
	)

Constructor with mass to be used as constraint value

Definition at line 4 of file MassKinematicConstraint.cc.

References dd, visualization-live-secondInstance_cfg::m, and mass.

Referenced by clone().

                                                                                         {
  mass = m;
  AlgebraicVector deviation_l(7, 0);
  deviation_l(7) = sigma * sigma;
  dd = deviation_l;
}

Member Function Documentation

clone()

MassKinematicConstraint* MassKinematicConstraint::clone ( ) const

inlineoverridevirtual

Clone method

Implements KinematicConstraint.

Definition at line 50 of file MassKinematicConstraint.h.

References MassKinematicConstraint().

{ return new MassKinematicConstraint(*this); }

derivative() [1/2]

std::pair< AlgebraicMatrix, AlgebraicVector > MassKinematicConstraint::derivative ( const AlgebraicVector &  exPoint ) const

overridevirtual

Implements KinematicConstraint.

Definition at line 30 of file MassKinematicConstraint.cc.

References l1ctLayer1_cff::dr, and point.

                                                                                                                  {
  if (exPoint.num_row() == 0)
    throw VertexException("MomentumKinematicConstraint::deriavtive requested for zero Linearization point");

  //security check for extended cartesian parametrization
  int inSize = exPoint.num_row();
  if ((inSize % 7) != 0)
    throw VertexException("MomentumKinematicConstraint::linearization point has a wrong dimension");
  int nStates = inSize / 7;
  if (nStates != 1)
    throw VertexException("MassKinematicConstraint::multiple state refit is not supported in this version");
  AlgebraicMatrix dr(1, 7, 0);
  dr(1, 7) = 1;
  AlgebraicVector point = exPoint;
  return std::pair<AlgebraicMatrix, AlgebraicVector>(dr, point);
}

derivative() [2/2]

std::pair< AlgebraicMatrix, AlgebraicVector > MassKinematicConstraint::derivative ( const std::vector< RefCountedKinematicParticle > &  par ) const

overridevirtual

Implements KinematicConstraint.

Definition at line 61 of file MassKinematicConstraint.cc.

References l1ctLayer1_cff::dr, and point.

                                                             {
  int nStates = par.size();
  if (nStates == 0)
    throw VertexException("MassKinematicConstraint::empty vector of particles passed");
  if (nStates != 1)
    throw VertexException("MassKinematicConstraint::multiple state refit is not supported in this version");

  AlgebraicVector point = asHepVector<7>(par.front()->currentState().kinematicParameters().vector());
  AlgebraicMatrix dr(1, 7, 0);
  dr(1, 7) = 1;
  return std::pair<AlgebraicMatrix, AlgebraicVector>(dr, point);
}

deviations()

AlgebraicVector MassKinematicConstraint::deviations ( int  nStates ) const

overridevirtual

Returns vector of sigma squared associated to the KinematicParameters of refitted particles Initial deviations are given by user for the constraining parameters (mass, momentum components etc). In case of multiple states exactly the same values are added to every particle parameters

Implements KinematicConstraint.

Definition at line 75 of file MassKinematicConstraint.cc.

References dd.

                                                                     {
  if (nStates == 0)
    throw VertexException("MassKinematicConstraint::empty vector of particles passed");
  if (nStates != 1)
    throw VertexException("MassKinematicConstraint::multiple state refit is not supported in this version");
  AlgebraicVector res = dd;
  return res;
}

numberOfEquations()

int MassKinematicConstraint::numberOfEquations ( ) const

overridevirtual

Returns number of constraint equations used for fitting. Method is relevant for proper NDF calculations.

Implements KinematicConstraint.

Definition at line 84 of file MassKinematicConstraint.cc.

{ return 1; }

value() [1/2]

std::pair< AlgebraicVector, AlgebraicVector > MassKinematicConstraint::value ( const AlgebraicVector &  exPoint ) const

overridevirtual

Vector of values and matrix of derivatives calculated at given 7xNumberOfStates point

Implements KinematicConstraint.

Definition at line 11 of file MassKinematicConstraint.cc.

References mass, and point.

                                                                                                             {
  //we have only one equation and only one track, means the constraint value
  //for track parameters is just a single number
  if (exPoint.num_row() == 0)
    throw VertexException("MomentumKinematicConstraint::value requested for zero Linearization point");

  //security check for extended cartesian parametrization
  int inSize = exPoint.num_row();
  if ((inSize % 7) != 0)
    throw VertexException("MomentumKinematicConstraint::linearization point has a wrong dimension");
  int nStates = inSize / 7;
  if (nStates != 1)
    throw VertexException("MassKinematicConstraint::multiple state refit is not supported in this version");
  AlgebraicVector vl(1, 0);
  AlgebraicVector point = exPoint;
  vl(1) = point(7) - mass;
  return std::pair<AlgebraicVector, AlgebraicVector>(vl, point);
}

value() [2/2]

std::pair< AlgebraicVector, AlgebraicVector > MassKinematicConstraint::value ( const std::vector< RefCountedKinematicParticle > &  par ) const

overridevirtual

Vector of values and matrix of derivatives calculated using current state parameters as expansion point

Implements KinematicConstraint.

Definition at line 47 of file MassKinematicConstraint.cc.

References mass, and point.

                                                             {
  int nStates = par.size();
  if (nStates == 0)
    throw VertexException("MassKinematicConstraint::empty vector of particles passed");
  if (nStates != 1)
    throw VertexException("MassKinematicConstraint::multiple state refit is not supported in this version");

  AlgebraicVector point = asHepVector<7>(par.front()->currentState().kinematicParameters().vector());
  AlgebraicVector vl(1, 0);
  vl(1) = point(7) - mass;
  return std::pair<AlgebraicVector, AlgebraicVector>(vl, point);
}

Member Data Documentation

dd

AlgebraicVector MassKinematicConstraint::dd

private

Definition at line 54 of file MassKinematicConstraint.h.

Referenced by deviations(), and MassKinematicConstraint().

mass

ParticleMass MassKinematicConstraint::mass

private

Definition at line 53 of file MassKinematicConstraint.h.

Referenced by Particle.Particle::__str__(), ZMuMuRochCorAnalyzer.DiMuon::__str__(), DiObject.DiMuon::__str__(), MassKinematicConstraint(), datamodel.Object::p4(), and value().