MassKinematicConstraint Class Reference

#include <MassKinematicConstraint.h>

Inheritance diagram for MassKinematicConstraint:

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

Referenced by clone().

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

Member Function Documentation

virtual MassKinematicConstraint* MassKinematicConstraint::clone ( ) const

inlinevirtual

Clone method

Implements KinematicConstraint.

Definition at line 53 of file MassKinematicConstraint.h.

References MassKinematicConstraint().

 {return new MassKinematicConstraint(*this);}

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

virtual

Implements KinematicConstraint.

Definition at line 30 of file MassKinematicConstraint.cc.

References 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); 
}

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

virtual

Implements KinematicConstraint.

Definition at line 57 of file MassKinematicConstraint.cc.

References 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);
}

AlgebraicVector MassKinematicConstraint::deviations ( int  nStates ) const

virtual

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 69 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;
}

int MassKinematicConstraint::numberOfEquations ( ) const

virtual

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

Implements KinematicConstraint.

Definition at line 77 of file MassKinematicConstraint.cc.

{return 1;}

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

virtual

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

Implements KinematicConstraint.

Definition at line 12 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);
}

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

virtual

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

Implements KinematicConstraint.

Definition at line 45 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

AlgebraicVector MassKinematicConstraint::dd

private

Definition at line 58 of file MassKinematicConstraint.h.

Referenced by deviations(), and MassKinematicConstraint().

ParticleMass MassKinematicConstraint::mass

private

Definition at line 57 of file MassKinematicConstraint.h.

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