Calculation of the Pt corrected mass vertex flavour tag input. More...

#include <vertexmass.h>

Inheritance diagram for vertex_lcfi::VertexMass:

Collaboration diagram for vertex_lcfi::VertexMass:

Public Member Functions
	VertexMass ()
	Default Constructor.

string	name () const
	Name. More...

std::vector< string >	parameterNames () const
	Parameter Names. More...

std::vector< string >	parameterValues () const
	Parameter Values. More...

void	setStringParameter (const string &Parameter, const string &Value)
	Set String Parameter. More...

void	setDoubleParameter (const string &Parameter, const double Value)
	Set Double Parameter. More...

void	setPointerParameter (const string &Parameter, void *Value)
	Set Pointer Parameter. More...

double	calculateFor (DecayChain *MyDecayChain) const
	Run the algorithm on a jet. More...

	VertexMass ()
	Default Constructor.

string	name () const
	Name. More...

std::vector< string >	parameterNames () const
	Parameter Names. More...

std::vector< string >	parameterValues () const
	Parameter Values. More...

void	setStringParameter (const string &Parameter, const string &Value)
	Set String Parameter. More...

void	setDoubleParameter (const string &Parameter, const double Value)
	Set Double Parameter. More...

void	setPointerParameter (const string &Parameter, void *Value)
	Set Pointer Parameter. More...

double	calculateFor (DecayChain *MyDecayChain) const
	Run the algorithm on a jet. More...

Static Public Member Functions
static double	Ptcalc (Vertex , Vertex , Vector3 *, float)
	Calculate vertex-constrained Pt correction.

static double	Ptcalc (Vertex , Vertex , Vector3 *, float)
	Calculate vertex-constrained Pt correction.

Additional Inherited Members
Public Types inherited from vertex_lcfi::Algo< DecayChain *, double >
typedef double	OutType

typedef double	OutType

typedef DecayChain *	InType

typedef DecayChain *	InType

Protected Member Functions inherited from vertex_lcfi::Algo< DecayChain *, double >
void	badParameter (std::string Parameter)

void	badParameter (std::string Parameter)

Detailed Description

Calculation of the Pt corrected mass vertex flavour tag input.

This class calculates the Pt corrected mass flavour tag input. The input is a DecayChain. This DecayChain is expected to be the output of vertex_lcfi::TrackAttach algorithm. In this algorithm all the tracks are either added (attached) to the seed vertex or removed from the DecayChain. The first step of the algorithm is to search the DecayChain for the seed vertex, defined as vertex furthest from the IP. The routine then assumes that there is only one vertex in this DecayChain and that all the tracks in the DecayChain are attached to this vertex. The algorithm attempts to calculate the mass of this vertex. For this calculation we use the assumption that each track in the vertex has the mass of a charged pion. Additionally a kinematic correction is applied in order to minimise the transverse momentum of the tracks attached to the vertex. This accounts for the fact that some tracks might be neutral particles. There is however a limit on the maximum number of sigmas (based on error matrices) within which the the vertex axis can move. We then use this transverse momentum to calculate the pt corected vertex mass.

Parameters

MaxMomentumAngle	maximum value of p^2 (1- cos^2(theta)), where theta is the angle between the vertex axis and the total momentum of the tracks attached to the vertex.
MaxKinematicCorrectionSigma	maximum number of sigmas (based on error matrices) within which the the vertex axis can move.
MaxMomentumCorrection	Maximum factor, by which vertex mass can be corrected (if this value is 2 the maximum mass returned will be twice the mass calculated without kinematic corrections.

Author: Erik Devetak (e.dev.nosp@m.etak.nosp@m.1@phy.nosp@m.sics.nosp@m..ox.a.nosp@m.c.uk)

Definition at line 39 of file include/vertex_lcfi/algo/inc/vertexmass.h.

Member Function Documentation

double vertex_lcfi::VertexMass::calculateFor ( DecayChain * MyDecayChain ) const

virtual

Run the algorithm on a jet.

Calculate the Momentum Corrected mass of the seed vertex.

Parameters

DecayChain Pointer to the decay chain to be analysed. This decay chain is an output from the track attach algorithm in which case it is composed only of one vertex and attached tracks.

Returns: double: Momentum corrected mass

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 96 of file vertexmass.cpp.

References vertex_lcfi::DecayChain::allTracks(), Ptcalc(), and vertex_lcfi::DecayChain::vertices().

double vertex_lcfi::VertexMass::calculateFor ( DecayChain * MyDecayChain ) const

virtual

Run the algorithm on a jet.

Calculate the Momentum Corrected mass of the seed vertex.

Parameters

DecayChain Pointer to the decay chain to be analysed. This decay chain is an output from the track attach algorithm in which case it is composed only of one vertex and attached tracks.

Returns: double: Momentum corrected mass

Implements vertex_lcfi::Algo< DecayChain *, double >.

string vertex_lcfi::VertexMass::name ( ) const

virtual

Name.

String name of the algorithm

Returns: String name

Implements vertex_lcfi::Algo< DecayChain *, double >.

string vertex_lcfi::VertexMass::name ( ) const

virtual

Name.

String name of the algorithm

Returns: String name

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 33 of file vertexmass.cpp.

std::vector< string > vertex_lcfi::VertexMass::parameterNames ( ) const

virtual

Parameter Names.

A vector of the names of the algorithms parameters

Returns: vector of string names

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 38 of file vertexmass.cpp.

std::vector<string> vertex_lcfi::VertexMass::parameterNames ( ) const

virtual

Parameter Names.

A vector of the names of the algorithms parameters

Returns: vector of string names

Implements vertex_lcfi::Algo< DecayChain *, double >.

std::vector<string> vertex_lcfi::VertexMass::parameterValues ( ) const

virtual

Parameter Values.

A vector of the values of the algorithms parameters, in the same order as parameter names

Returns: vector of string values

Implements vertex_lcfi::Algo< DecayChain *, double >.

std::vector< string > vertex_lcfi::VertexMass::parameterValues ( ) const

virtual

Parameter Values.

A vector of the values of the algorithms parameters, in the same order as parameter names

Returns: vector of string values

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 43 of file vertexmass.cpp.

void vertex_lcfi::VertexMass::setDoubleParameter	(	const string &	Parameter,
		const double	Value
	)

virtual

Set Double Parameter.

Set a double parameter

Parameters

Parameter	String of parameter name
Value	double of parameter value

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 57 of file vertexmass.cpp.

void vertex_lcfi::VertexMass::setDoubleParameter	(	const string &	Parameter,
		const double	Value
	)

virtual

Set Double Parameter.

Set a double parameter

Parameters

Parameter	String of parameter name
Value	double of parameter value

Implements vertex_lcfi::Algo< DecayChain *, double >.

void vertex_lcfi::VertexMass::setPointerParameter	(	const string &	Parameter,
		void *	Value
	)

virtual

Set Pointer Parameter.

Set a pointer parameter

Parameters

Parameter	String of parameter name
Value	pointer to void

Implements vertex_lcfi::Algo< DecayChain *, double >.

void vertex_lcfi::VertexMass::setPointerParameter	(	const string &	Parameter,
		void *	Value
	)

virtual

Set Pointer Parameter.

Set a pointer parameter

Parameters

Parameter	String of parameter name
Value	pointer to void

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 77 of file vertexmass.cpp.

void vertex_lcfi::VertexMass::setStringParameter	(	const string &	Parameter,
		const string &	Value
	)

virtual

Set String Parameter.

Set a string parameter

Parameters

Parameter	String of parameter name
Value	String of parameter value

Implements vertex_lcfi::Algo< DecayChain *, double >.

void vertex_lcfi::VertexMass::setStringParameter	(	const string &	Parameter,
		const string &	Value
	)

virtual

Set String Parameter.

Set a string parameter

Parameters

Parameter	String of parameter name
Value	String of parameter value

Implements vertex_lcfi::Algo< DecayChain *, double >.

Definition at line 52 of file vertexmass.cpp.

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

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation