mty::QuantumNumber Class Reference

This class represents quantum numbers of a theory, like for example baryon number B, lepton number L etc. More...

#include <quantumNumber.h>

Public Types
using	ID = unsigned short
	Integer type for QuantumNumber id.
using	Value = int
	Integer type for quantum number value.

Public Member Functions
	QuantumNumber (std::string const &t_name, bool t_conserved=true)
	Constructor with 2 parameters. More...
	QuantumNumber (QuantumNumber const &)=default
	Defaulted copy constructor.
QuantumNumber &	operator= (QuantumNumber const &)=default
	Defaulted copy assignement operator.
	~QuantumNumber ()
	Destructor.
bool	isConserved () const
	Returns the conservation property of the quantum number. More...
std::string	getName () const
	Returns the name of the quantum number. More...
void	setConservedProperty (bool t_conserved)
	Sets the conserved property of the quantum number. More...
void	setName (std::string const &t_name)
	Sets the name of the quantum number. More...
bool	appearsIn (std::vector< mty::QuantumField > const &fields) const
	Tells if one of the fields has a non trivial value for the quantum number. More...
int	computeQuantumNumber (std::vector< mty::QuantumField > const &field) const
	Calculates the value of the total quantum numbers carried by a list of fields. More...
ID	getID () const
	Returns the id of the quantum number. More...
bool	operator== (QuantumNumber const &other) const
	Compares the ids of two quantum numbers. More...
bool	operator!= (QuantumNumber const &other) const
	Compares the ids of two quantum numbers. More...

Static Private Member Functions
static std::map< ID, std::string > &	name ()
	Returns the map between ids and names for quantumNumbers. More...

Private Attributes
bool	conserved
	Tells if the quantum number is conserved. More...
ID	id
	ID of the quantum number.

Static Private Attributes
static ID	current_id = 0
	Current id of QuantumNumber. More...

Detailed Description

This class represents quantum numbers of a theory, like for example baryon number B, lepton number L etc.

When doing a calculation, you may give a list of independant quantum numbers (like B and L in the SM) to be conserved. This will not change the result but will allow MARTY to discard early diagrams that are zero. You must not give non-independant quantum numbers like F (fermion number) and B. If so, MARTY will discard diagrams that are actually possible because some particles (quarks in this example) may contribute in both numbers.

Constructor & Destructor Documentation

QuantumNumber()

mty::QuantumNumber::QuantumNumber ( std::string const &  t_name, bool  t_conserved = true  )

explicit

Constructor with 2 parameters.

Initliazes the name, and possible the conserved property of the quantum number.

Parameters

t_name	Name.
t_conserved	Boolean that tells if the quantum number is conserved (default = true).

Member Function Documentation

appearsIn()

bool mty::QuantumNumber::appearsIn

(

std::vector< mty::QuantumField > const &

fields

)

const

Tells if one of the fields has a non trivial value for the quantum number.

Parameters

fields

List of fields.

Returns

True if one of the fields has a non trivial value for the quantum number.

False else.

computeQuantumNumber()

int mty::QuantumNumber::computeQuantumNumber

(

std::vector< mty::QuantumField > const &

field

)

const

Calculates the value of the total quantum numbers carried by a list of fields.

For example, qqq has baryonic number B = 1, leptonic number L = 0, fermionic number F = 3.

Parameters

fields

List of fields

Returns

The sum of the quantum values corresponding to the fields.

getID()

ID mty::QuantumNumber::getID ( ) const

inline

Returns the id of the quantum number.

Returns

The quantum number ID

getName()

std::string mty::QuantumNumber::getName

(

)

const

Returns the name of the quantum number.

The name is not stored directly in the quantum number. Instead, the id is the key to get it. This function then determines the name corresponding to the quantum number's id, and returns it.

Returns

The name of the quantum number.

isConserved()

bool mty::QuantumNumber::isConserved

(

)

const

Returns the conservation property of the quantum number.

Returns

True if the quantum number is conserved.

False else.

name()

static std::map<ID, std::string>& mty::QuantumNumber::name ( )

inlinestaticprivate

Returns the map between ids and names for quantumNumbers.

This function allocates statically a map between IDs and names, and returns a reference to it.

Returns

The mapping between ids and names for quantum numbers.

operator!=()

bool mty::QuantumNumber::operator!= ( QuantumNumber const &  other ) const

inline

Compares the ids of two quantum numbers.

Returns

False if the two quantum numbers have the same id (same quantum number then)

True else

operator==()

bool mty::QuantumNumber::operator== ( QuantumNumber const &  other ) const

inline

Compares the ids of two quantum numbers.

Returns

True if the two quantum numbers have the same id (same quantum number then)

False else

setConservedProperty()

void mty::QuantumNumber::setConservedProperty

(

bool

t_conserved

)

Sets the conserved property of the quantum number.

Parameters

t_conserved

Boolean. If true, the quantum number is conserved and may be used to simplify calculations.

setName()

void mty::QuantumNumber::setName

(

std::string const &

t_name

)

Sets the name of the quantum number.

Parameters

t_name

New name of the quantum number.

Field Documentation

conserved

bool mty::QuantumNumber::conserved

private

Tells if the quantum number is conserved.

True by default. If false, the quantum number has no impact on any calculation.

current_id

ID mty::QuantumNumber::current_id = 0

inlinestaticprivate

Current id of QuantumNumber.

This is used to define the id of new quantum numbers. Each time, this variable is incremented.

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

• include/quantumNumber.h
• src/quantumNumber.cpp