Use WidthCalculatorBase objects to integrate over the mass of two external particles which can be off-shell for running width calculations. More...

#include <TwoOffShellCalculator.h>

Inheritance diagram for Herwig::TwoOffShellCalculator:

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Public Member Functions
	TwoOffShellCalculator (int inloc, WidthCalculatorBasePtr inwidth, GenericMassGeneratorPtr inmass, Energy inmin2, Energy inmin1)
	Constructor which should be used setting all the required members.

Energy	partialWidth (Energy2 scale) const
	member to calculate the partial width.

void	resetMass (int imass, Energy mass)
	Get the mass of one of the decay products.

Energy	getMass (const int imass) const
	Get the mass of one of the decay products.

Energy	otherMass (const int imass) const
	Get the masses of all bar the one specified.

Public Member Functions inherited from Herwig::WidthCalculatorBase
virtual	~WidthCalculatorBase ()
	Destructor.

virtual Energy	partialWidth (Energy2 scale) const =0
	Calculate the partial width.

virtual void	resetMass (int imass, Energy mass)=0
	Reset the mass of a particle (used to integrate over the mass.) This must be implemented in classes inheriting from this one.

virtual Energy	getMass (const int imass) const =0
	Get the mass of one of the decay products.

virtual Energy	otherMass (const int imass) const =0
	Get the masses of all bar the one specified.

Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType	referenceCount () const

Protected Member Functions
Energy	dGamma (Energy mass) const
	The integrand.

Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
	ReferenceCounted (const ReferenceCounted &)

ReferenceCounted &	operator= (const ReferenceCounted &)

Private Member Functions
TwoOffShellCalculator &	operator= (const TwoOffShellCalculator &)=delete
	Private and non-existent assignment operator.

Private Attributes
int	_themass
	The second mass which is offshell.

Energy	_minmass
	the minimum allowed mass

Energy	_mother
	sum of the masses of the other decay products

WidthCalculatorBasePtr	_oneoffwidth
	pointer to object calculating the width for one-off shell particle.

GenericMassGeneratorPtr	_massptr
	pointer to object calculating the mass of the particle

GSLIntegrator	_integrator
	integrator

Energy2	_scale
	the mass squared of the decaying particle

Friends
struct	TwoOffShellIntegrand
	The TwoOffShellIntegrand class is a friend to allow access to the private members for the integration.

Additional Inherited Members
Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int	CounterType

Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long	uniqueId

Detailed Description

Use WidthCalculatorBase objects to integrate over the mass of two external particles which can be off-shell for running width calculations.

See also: WidthCalculatorBase; TwoOffShellIntegrand

Definition at line 33 of file TwoOffShellCalculator.h.

Constructor & Destructor Documentation

◆ TwoOffShellCalculator()

Herwig::TwoOffShellCalculator::TwoOffShellCalculator	(	int	inloc,
		WidthCalculatorBasePtr	inwidth,
		GenericMassGeneratorPtr	inmass,
		Energy	inmin2,
		Energy	inmin1
	)

inline

Constructor which should be used setting all the required members.

Parameters

inloc	The mass which is off-shell and to be integrated over.
inwidth	Pointer to the WidthGeneratorBase object which calculates the partial width for a given mass of the off-shell particle. This should be a OneOffShellCalculator instance.
inmass	Pointer to the GenericMassGenerator for the off-shell particle.
inmin1	The minimum mass for the first off-shell particle.
inmin2	The minimum mass for the second off-shell particle.

Definition at line 53 of file TwoOffShellCalculator.h.

Member Function Documentation

◆ dGamma()

Energy Herwig::TwoOffShellCalculator::dGamma ( Energy mass ) const

inlineprotected

The integrand.

Parameters

mass	The mass of the second off-shell particle,

Returns: The differential rate.

Definition at line 105 of file TwoOffShellCalculator.h.

References _massptr, _oneoffwidth, _scale, and _themass.

◆ getMass()

Energy Herwig::TwoOffShellCalculator::getMass ( const int imass ) const

inlinevirtual

Get the mass of one of the decay products.

This must be implemented in classes inheriting from this one.

Parameters

imass The mass required.

Returns: The mass required.

Implements Herwig::WidthCalculatorBase.

Definition at line 84 of file TwoOffShellCalculator.h.

References _oneoffwidth.

◆ otherMass()

Energy Herwig::TwoOffShellCalculator::otherMass ( const int imass ) const

inlinevirtual

Get the masses of all bar the one specified.

Used to get the limits for integration.

Parameters

imass The particle not needed

Returns: The sum of the other masses.

Implements Herwig::WidthCalculatorBase.

Definition at line 94 of file TwoOffShellCalculator.h.

References _oneoffwidth.

◆ partialWidth()

Energy Herwig::TwoOffShellCalculator::partialWidth ( Energy2 scale ) const

virtual

member to calculate the partial width.

Parameters

scale The mass squared for the decaying particle.

Returns: The partial width.

Implements Herwig::WidthCalculatorBase.

◆ resetMass()

void Herwig::TwoOffShellCalculator::resetMass	(	int	imass,
		Energy	mass
	)

inlinevirtual

Get the mass of one of the decay products.

This must be implemented in classes inheriting from this one.

Parameters

imass	The mass required.
mass	The new value.

Returns: The mass required.

Implements Herwig::WidthCalculatorBase.

Definition at line 74 of file TwoOffShellCalculator.h.

References _oneoffwidth.

Friends And Related Function Documentation

◆ TwoOffShellIntegrand

friend struct TwoOffShellIntegrand

friend

The TwoOffShellIntegrand class is a friend to allow access to the private members for the integration.

Definition at line 39 of file TwoOffShellCalculator.h.

Member Data Documentation

◆ _integrator

GSLIntegrator Herwig::TwoOffShellCalculator::_integrator

private

integrator

Definition at line 149 of file TwoOffShellCalculator.h.

◆ _massptr

GenericMassGeneratorPtr Herwig::TwoOffShellCalculator::_massptr

private

pointer to object calculating the mass of the particle

Definition at line 144 of file TwoOffShellCalculator.h.

Referenced by dGamma().

◆ _minmass

Energy Herwig::TwoOffShellCalculator::_minmass

private

the minimum allowed mass

Definition at line 129 of file TwoOffShellCalculator.h.

◆ _mother

Energy Herwig::TwoOffShellCalculator::_mother

private

sum of the masses of the other decay products

Definition at line 134 of file TwoOffShellCalculator.h.

◆ _oneoffwidth

WidthCalculatorBasePtr Herwig::TwoOffShellCalculator::_oneoffwidth

private

pointer to object calculating the width for one-off shell particle.

Definition at line 139 of file TwoOffShellCalculator.h.

Referenced by dGamma(), getMass(), otherMass(), and resetMass().

◆ _scale

Energy2 Herwig::TwoOffShellCalculator::_scale

mutableprivate

the mass squared of the decaying particle

Definition at line 154 of file TwoOffShellCalculator.h.

Referenced by dGamma().

◆ _themass

int Herwig::TwoOffShellCalculator::_themass

private

The second mass which is offshell.

Definition at line 125 of file TwoOffShellCalculator.h.

Referenced by dGamma().

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

TwoOffShellCalculator.h

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ TwoOffShellCalculator()

Member Function Documentation

◆ dGamma()

◆ getMass()

◆ otherMass()

◆ partialWidth()

◆ resetMass()

Friends And Related Function Documentation

◆ TwoOffShellIntegrand

Member Data Documentation

◆ _integrator

◆ _massptr

◆ _minmass

◆ _mother

◆ _oneoffwidth

◆ _scale

◆ _themass