Caching for amplitudes using spinor helicity techniques. More...

#include <AmplitudeCache.h>

Inheritance diagram for Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >:

[legend]

Classes
struct	boolResetter
	Helper to reset flags. More...

Public Member Functions
	AmplitudeCache ()
	Constructor.

void	nPoints (int n)
	Prepare for n-point amplitude.

int	nPoints () const
	Return the number of points.

void	amplitudeScale (Energy s) const
	Set the energy scale to obtain dimensionless quantities and flag all quantities to be recalculated.

void	momentum (int k, const LorentzMomentum &p, bool getSpinors=true, Energy mass=ZERO) const
	Set the momentum for the k'th parton and its associated mass.

void	reset () const
	Reset flags.

LorentzVector< double >	momentum (int k) const
	Return the momentum for the k'th parton.

Energy	amplitudeScale () const
	Get the energy scale to obtain dimensionless quantities and flag all quantities to be recalculated.

double	mass (int k) const
	Return the mass associated to the k'th parton.

int	crossingSign (int i) const
	Return the crossing sign for the i'th parton.

double	crossingSign (int i, int j) const
	Return the crossing sign for the i'th and j'th parton.

double	invariant (int i, int j) const
	Return (ij)

Complex	plusProduct (int i, int j) const
	Return <ij>

Complex	minusProduct (int i, int j) const
	Return [ij].

LorentzVector< Complex >	plusCurrent (int i, int j) const
	Return <i\|\gamma^\mu\|j].

LorentzVector< Complex >	minusCurrent (int i, int j) const
	Return [i\|\gamma^\mu\|j>

bool	getAmplitude (const AmplitudeKey &key) const
	Return true, if the given amplitude needs to be recalculated.

void	cacheAmplitude (Complex amp) const
	Cache an amplitude.

const Complex &	cachedAmplitude () const
	Return a cached amplitude.

bool	getCurrent (const AmplitudeKey &key) const
	Return true, if the given current needs to be recalculated.

void	cacheCurrent (const LorentzVector< Complex > &curr) const
	Cache an current.

const LorentzVector< Complex > &	cachedCurrent () const
	Return a cached current.

Private Types
enum	{ MAX_N = 7 , SYM_N = MAX_N*(MAX_N+1)/2 }
	Maximum N we can handle, SYM_N is storage size for a symmetric matrix of N * N elements. More...

typedef map< AmplitudeKey, pair< bool, Complex > >	AmplitudeCacheMap

typedef map< AmplitudeKey, pair< bool, LorentzVector< Complex > > >	CurrentCacheMap

Private Member Functions
size_t	idx (size_t i, size_t j) const
	Helper function to index symmetric arrays, assumes i <= j.

Private Attributes
int	theNPoints
	The number of points.

Energy	theScale
	The energy scale to obtain dimensionless quantities.

array< double, MAX_N >	theMasses
	Masses indexed by partons.

array< LorentzMomentum, MAX_N >	theMomenta
	Momenta indexed by partons.

array< int, MAX_N >	theCrossingSigns
	Crossing signs indexed by partons.

array< PlusSpinor, MAX_N >	thePlusSpinors
	Plus spinors indexed by partons.

array< PlusConjugateSpinor, MAX_N >	thePlusConjugateSpinors
	Plus conjugate spinors indexed by partons.

array< double, SYM_N >	theInvariants
	Invariants indexed by partons.

array< bool, SYM_N >	getInvariant
	Flag products to be recalculated.

array< Complex, SYM_N >	thePlusProducts
	Spinor products indexed by partons.

array< bool, SYM_N >	getPlusProduct
	Flag products to be recalculated.

array< LorentzVector< Complex >, SYM_N >	thePlusCurrents
	Spinor currents indexed by partons.

array< bool, SYM_N >	getPlusCurrent
	Flag currents to be recalculated.

AmplitudeCacheMap	theCachedAmplitudes
	Cache intermediate amplitudes by index.

AmplitudeCacheMap::iterator	theLastAmplitude
	The last query for a cached amplitude.

CurrentCacheMap	theCachedCurrents
	Cache intermediate currents by index.

CurrentCacheMap::iterator	theLastCurrent
	The last query for a cached current.

Detailed Description

template<typename AmplitudeKey>
class Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >

Caching for amplitudes using spinor helicity techniques.

Author: Simon Platzer

Definition at line 31 of file AmplitudeCache.h.

Member Typedef Documentation

◆ AmplitudeCacheMap

template<typename AmplitudeKey >

typedef map<AmplitudeKey,pair<bool,Complex> > Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::AmplitudeCacheMap

private

Definition at line 33 of file AmplitudeCache.h.

◆ CurrentCacheMap

template<typename AmplitudeKey >

typedef map<AmplitudeKey,pair<bool,LorentzVector<Complex> > > Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::CurrentCacheMap

private

Definition at line 34 of file AmplitudeCache.h.

Member Enumeration Documentation

◆ anonymous enum

template<typename AmplitudeKey >

anonymous enum

private

Maximum N we can handle, SYM_N is storage size for a symmetric matrix of N * N elements.

Definition at line 39 of file AmplitudeCache.h.

Constructor & Destructor Documentation

◆ AmplitudeCache()

template<typename AmplitudeKey >

Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::AmplitudeCache ( )

inline

Constructor.

Definition at line 152 of file AmplitudeCache.h.

Member Function Documentation

◆ amplitudeScale()

template<typename AmplitudeKey >

Energy Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::amplitudeScale ( ) const

inline

Get the energy scale to obtain dimensionless quantities and flag all quantities to be recalculated.

Definition at line 196 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theScale.

◆ cacheAmplitude()

template<typename AmplitudeKey >

void Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cacheAmplitude ( Complex amp ) const

inline

Cache an amplitude.

Definition at line 300 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastAmplitude.

◆ cacheCurrent()

template<typename AmplitudeKey >

void Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cacheCurrent ( const LorentzVector< Complex > & curr ) const

inline

Cache an current.

Definition at line 327 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastCurrent.

◆ cachedAmplitude()

template<typename AmplitudeKey >

const Complex & Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cachedAmplitude ( ) const

inline

Return a cached amplitude.

Definition at line 307 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastAmplitude.

◆ cachedCurrent()

template<typename AmplitudeKey >

const LorentzVector< Complex > & Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cachedCurrent ( ) const

inline

Return a cached current.

Definition at line 334 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastCurrent.

◆ crossingSign() [1/2]

template<typename AmplitudeKey >

int Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::crossingSign ( int i ) const

inline

Return the crossing sign for the i'th parton.

Definition at line 207 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCrossingSigns.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::minusProduct(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent().

◆ crossingSign() [2/2]

template<typename AmplitudeKey >

double Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::crossingSign	(	int	i,
		int	j
	)		const

inline

Return the crossing sign for the i'th and j'th parton.

Definition at line 213 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCrossingSigns.

◆ getAmplitude()

template<typename AmplitudeKey >

bool Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getAmplitude ( const AmplitudeKey & key ) const

inline

Return true, if the given amplitude needs to be recalculated.

Definition at line 288 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCachedAmplitudes, and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastAmplitude.

◆ getCurrent()

template<typename AmplitudeKey >

bool Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getCurrent ( const AmplitudeKey & key ) const

inline

Return true, if the given current needs to be recalculated.

Definition at line 315 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCachedCurrents, and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastCurrent.

◆ idx()

template<typename AmplitudeKey >

size_t Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::idx	(	size_t	i,
		size_t	j
	)		const

inlineprivate

Helper function to index symmetric arrays, assumes i <= j.

Usual indexing function (N*i + j) corrected by triangle number for i-th row.

Definition at line 131 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::invariant(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

◆ invariant()

template<typename AmplitudeKey >

double Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::invariant	(	int	i,
		int	j
	)		const

inline

Return (ij)

Definition at line 218 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getInvariant, Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::idx(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::momentum(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theInvariants.

◆ mass()

template<typename AmplitudeKey >

double Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::mass ( int k ) const

inline

Return the mass associated to the k'th parton.

Definition at line 201 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theMasses.

◆ minusCurrent()

template<typename AmplitudeKey >

LorentzVector< Complex > Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::minusCurrent	(	int	i,
		int	j
	)		const

inline

Return [i|\gamma^\mu|j>

Definition at line 278 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent().

◆ minusProduct()

template<typename AmplitudeKey >

Complex Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::minusProduct	(	int	i,
		int	j
	)		const

inline

Return [ij].

Definition at line 249 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::crossingSign(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

◆ momentum()

template<typename AmplitudeKey >

LorentzVector< double > Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::momentum ( int k ) const

inline

Return the momentum for the k'th parton.

Definition at line 190 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theMomenta, and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theScale.

◆ nPoints()

template<typename AmplitudeKey >

int Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::nPoints ( ) const

inline

Return the number of points.

Definition at line 162 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theNPoints.

◆ plusCurrent()

template<typename AmplitudeKey >

LorentzVector< Complex > Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent	(	int	i,
		int	j
	)		const

inline

Return <i|\gamma^\mu|j].

Definition at line 258 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::minusCurrent().

◆ plusProduct()

template<typename AmplitudeKey >

Complex Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct	(	int	i,
		int	j
	)		const

inline

Return <ij>

Definition at line 231 of file AmplitudeCache.h.

References Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getPlusProduct, Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::idx(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusConjugateSpinors, Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusProducts, Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusSpinors, and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theScale.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::minusProduct().

Member Data Documentation

◆ getInvariant

template<typename AmplitudeKey >

array<bool,SYM_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getInvariant

mutableprivate

Flag products to be recalculated.

Definition at line 85 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::invariant().

◆ getPlusCurrent

template<typename AmplitudeKey >

array<bool,SYM_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getPlusCurrent

mutableprivate

Flag currents to be recalculated.

Definition at line 105 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent().

◆ getPlusProduct

template<typename AmplitudeKey >

array<bool,SYM_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getPlusProduct

mutableprivate

Flag products to be recalculated.

Definition at line 95 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

◆ theCachedAmplitudes

template<typename AmplitudeKey >

AmplitudeCacheMap Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCachedAmplitudes

mutableprivate

Cache intermediate amplitudes by index.

Definition at line 110 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getAmplitude().

◆ theCachedCurrents

template<typename AmplitudeKey >

CurrentCacheMap Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCachedCurrents

mutableprivate

Cache intermediate currents by index.

Definition at line 120 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getCurrent().

◆ theCrossingSigns

template<typename AmplitudeKey >

array<int,MAX_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theCrossingSigns

mutableprivate

Crossing signs indexed by partons.

Definition at line 65 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::crossingSign().

◆ theInvariants

template<typename AmplitudeKey >

array<double,SYM_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theInvariants

mutableprivate

Invariants indexed by partons.

Definition at line 80 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::invariant().

◆ theLastAmplitude

template<typename AmplitudeKey >

AmplitudeCacheMap::iterator Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastAmplitude

mutableprivate

The last query for a cached amplitude.

Definition at line 115 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cacheAmplitude(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cachedAmplitude(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getAmplitude().

◆ theLastCurrent

template<typename AmplitudeKey >

CurrentCacheMap::iterator Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theLastCurrent

mutableprivate

The last query for a cached current.

Definition at line 125 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cacheCurrent(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::cachedCurrent(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::getCurrent().

◆ theMasses

template<typename AmplitudeKey >

array<double,MAX_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theMasses

mutableprivate

Masses indexed by partons.

Definition at line 55 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::mass().

◆ theMomenta

template<typename AmplitudeKey >

array<LorentzMomentum,MAX_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theMomenta

mutableprivate

Momenta indexed by partons.

Definition at line 60 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::momentum(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent().

◆ theNPoints

template<typename AmplitudeKey >

int Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theNPoints

private

The number of points.

Definition at line 44 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::nPoints().

◆ thePlusConjugateSpinors

template<typename AmplitudeKey >

array<PlusConjugateSpinor,MAX_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusConjugateSpinors

mutableprivate

Plus conjugate spinors indexed by partons.

Definition at line 75 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

◆ thePlusCurrents

template<typename AmplitudeKey >

array<LorentzVector<Complex>,SYM_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusCurrents

mutableprivate

Spinor currents indexed by partons.

Definition at line 100 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent().

◆ thePlusProducts

template<typename AmplitudeKey >

array<Complex,SYM_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusProducts

mutableprivate

Spinor products indexed by partons.

Definition at line 90 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

◆ thePlusSpinors

template<typename AmplitudeKey >

array<PlusSpinor,MAX_N> Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::thePlusSpinors

mutableprivate

Plus spinors indexed by partons.

Definition at line 70 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

◆ theScale

template<typename AmplitudeKey >

Energy Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::theScale

mutableprivate

The energy scale to obtain dimensionless quantities.

Definition at line 50 of file AmplitudeCache.h.

Referenced by Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::amplitudeScale(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::momentum(), Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusCurrent(), and Herwig::SpinorHelicity::AmplitudeCache< AmplitudeKey >::plusProduct().

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

AmplitudeCache.h

Classes

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

◆ AmplitudeCacheMap

◆ CurrentCacheMap

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ AmplitudeCache()

Member Function Documentation

◆ amplitudeScale()

◆ cacheAmplitude()

◆ cacheCurrent()

◆ cachedAmplitude()

◆ cachedCurrent()

◆ crossingSign() [1/2]

◆ crossingSign() [2/2]

◆ getAmplitude()

◆ getCurrent()

◆ idx()

◆ invariant()

◆ mass()

◆ minusCurrent()

◆ minusProduct()

◆ momentum()

◆ nPoints()

◆ plusCurrent()

◆ plusProduct()

Member Data Documentation

◆ getInvariant

◆ getPlusCurrent

◆ getPlusProduct

◆ theCachedAmplitudes

◆ theCachedCurrents

◆ theCrossingSigns

◆ theInvariants

◆ theLastAmplitude

◆ theLastCurrent

◆ theMasses

◆ theMomenta

◆ theNPoints

◆ thePlusConjugateSpinors

◆ thePlusCurrents

◆ thePlusProducts

◆ thePlusSpinors

◆ theScale