herwig is hosted by Hepforge, IPPP Durham
Herwig  7.1.4
Herwig::QTildeSudakov Class Reference

The QTildeSudakov class implements the Sudakov form factor for evolution in $\tilde{q}^2$ using the veto algorithm. More...

#include <QTildeSudakov.h>

Inheritance diagram for Herwig::QTildeSudakov:

Public Member Functions

 QTildeSudakov ()
 The default constructor.
 
virtual double generatePhiForward (ShowerParticle &particle, const IdList &ids, ShoKinPtr kinematics, const RhoDMatrix &rho)
 Generate the azimuthal angle of the branching for forward branching. More...
 
virtual double generatePhiBackward (ShowerParticle &particle, const IdList &ids, ShoKinPtr kinematics, const RhoDMatrix &rho)
 Generate the azimuthal angle of the branching for backward branching. More...
 
virtual double generatePhiDecay (ShowerParticle &particle, const IdList &ids, ShoKinPtr kinematics, const RhoDMatrix &rho)
 Generate the azimuthal angle of the branching for ISR in decays. More...
 
virtual Energy calculateScale (double z, Energy pt, IdList ids, unsigned int iopt)
 Method to return the evolution scale given the transverse momentum, $p_T$ and $z$.
 
virtual ShoKinPtr createFinalStateBranching (Energy scale, double z, double phi, Energy pt)
 Method to create the ShowerKinematics object for a final-state branching.
 
virtual ShoKinPtr createInitialStateBranching (Energy scale, double z, double phi, Energy pt)
 Method to create the ShowerKinematics object for an initial-state branching.
 
virtual ShoKinPtr createDecayBranching (Energy scale, double z, double phi, Energy pt)
 Method to create the ShowerKinematics object for a decay branching.
 
virtual ShoKinPtr generateNextTimeBranching (const Energy startingScale, const IdList &ids, const RhoDMatrix &rho, double enhance, double detuning, Energy2 maxQ2)
 Members to generate the scale of the next branching. More...
 
virtual ShoKinPtr generateNextDecayBranching (const Energy startingScale, const Energy stoppingScale, const Energy minmass, const IdList &ids, const RhoDMatrix &rho, double enhance, double detuning)
 Return the scale of the next space-like decay branching. More...
 
virtual ShoKinPtr generateNextSpaceBranching (const Energy startingScale, const IdList &ids, double x, const RhoDMatrix &rho, double enhance, tcBeamPtr beam, double detuning)
 Return the scale of the next space-like branching. More...
 
Functions used by the persistent I/O system.
void persistentOutput (PersistentOStream &os) const
 Function used to write out object persistently. More...
 
void persistentInput (PersistentIStream &is, int version)
 Function used to read in object persistently. More...
 
- Public Member Functions inherited from Herwig::SudakovFormFactor
 SudakovFormFactor ()
 The default constructor.
 
double pdfMax () const
 Access the maximum weight for the PDF veto.
 
void setPDF (tcPDFPtr pdf, Energy scale)
 Set the PDF.
 
tSplittingFnPtr splittingFn () const
 Methods to provide public access to the private member variables. More...
 
tShowerAlphaPtr alpha () const
 Return the pointer to the ShowerAlpha object.
 
ShowerInteraction interactionType () const
 The type of interaction.
 
double z () const
 Methods to access the kinematic variables for the branching. More...
 
double phi () const
 The azimuthal angle.
 
Energy pT () const
 The transverse momentum.
 
void persistentOutput (PersistentOStream &os) const
 Function used to write out object persistently. More...
 
void persistentInput (PersistentIStream &is, int version)
 Function used to read in object persistently. More...
 
unsigned int cutOffOption () const
 The option being used.
 
Energy kinScale () const
 The kinematic scale.
 
Energy kinematicCutOff (Energy scale, Energy mq) const
 The virtuality cut-off on the gluon $Q_g=\frac{\delta-am_q}{b}$. More...
 
Energy vgCut () const
 The virtualilty cut-off for gluons.
 
Energy vqCut () const
 The virtuality cut-off for everything else.
 
Energy pTmin () const
 The minimum $p_T$ for the branching.
 
Energy2 pT2min () const
 The square of the minimum $p_T$.
 
const vector< Energy > & virtualMasses (const IdList &ids)
 Calculate the virtual masses for a branchings.
 
- Public Member Functions inherited from ThePEG::Interfaced
virtual bool defaultInit ()
 
PPtr getParticle (PID) const
 
PDPtr getParticleData (PID) const
 
bool used () const
 
void useMe () const
 
tEGPtr generator () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
PPtr getParticle (PID) const
 
PDPtr getParticleData (PID) const
 
bool used () const
 
void useMe () const
 
tEGPtr generator () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::InterfacedBase
string fullName () const
 
string name () const
 
string path () const
 
string comment () const
 
void setup (istream &is)
 
virtual void debugme () const
 
void update ()
 
void init ()
 
virtual bool preInitialize () const
 
void initrun ()
 
void finish ()
 
void touch ()
 
void reset ()
 
void clear ()
 
InitState state () const
 
bool locked () const
 
bool touched () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
void update ()
 
void init ()
 
virtual bool preInitialize () const
 
void initrun ()
 
void finish ()
 
void touch ()
 
void reset ()
 
void clear ()
 
InitState state () const
 
bool locked () const
 
bool touched () const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from ThePEG::Base
void debug () const
 
- Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType referenceCount () const
 
- Public Member Functions inherited from ThePEG::Named
 Named (const string &newName=string())
 
const string & name () const
 
bool operator== (const Named &other) const
 
bool operator< (const Named &other) const
 

Static Public Member Functions

static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- Static Public Member Functions inherited from Herwig::SudakovFormFactor
static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- Static Public Member Functions inherited from ThePEG::Interfaced
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::InterfacedBase
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::Base
static void Init ()
 

Protected Member Functions

void initialize (const IdList &ids, Energy2 &tmin)
 Initialize the values of the cut-offs and scales. More...
 
bool PSVeto (const Energy2 t, const Energy2 maxQ2)
 Phase Space veto member to implement the $\Theta$ function as a veto so that the emission is within the allowed phase space. More...
 
bool computeTimeLikeLimits (Energy2 &scale)
 Compute the limits on $z$ for time-like branching. More...
 
bool computeSpaceLikeLimits (Energy2 &scale, double x)
 Compute the limits on $z$ for space-like branching. More...
 
bool guessTimeLike (Energy2 &t, Energy2 tmin, double enhance, double detune)
 Methods to provide the next value of the scale before the vetos are applied. More...
 
bool guessDecay (Energy2 &t, Energy2 tmax, Energy minmass, double enhance, double detune)
 Value of the energy fraction and scale for time-like branching. More...
 
bool guessSpaceLike (Energy2 &t, Energy2 tmin, const double x, double enhance, double detune)
 Value of the energy fraction and scale for space-like branching. More...
 
Clone Methods.
virtual IBPtr clone () const
 Make a simple clone of this object. More...
 
virtual IBPtr fullclone () const
 Make a clone of this object, possibly modifying the cloned object to make it sane. More...
 
- Protected Member Functions inherited from Herwig::SudakovFormFactor
void addSplitting (const IdList &)
 Set the particles in the splittings.
 
void removeSplitting (const IdList &)
 Delete the particles in the splittings.
 
const vector< IdList > & particles () const
 Access the potential branchings.
 
virtual void doinit ()
 Initialize this object after the setup phase before saving an EventGenerator to disk. More...
 
double guessz (unsigned int iopt, const IdList &ids) const
 Methods to implement the veto algorithm to generate the scale of the next branching. More...
 
Energy2 guesst (Energy2 t1, unsigned int iopt, const IdList &ids, double enhance, bool identical, double detune) const
 Value of the scale for the veto algorithm. More...
 
bool PDFVeto (const Energy2 t, const double x, const tcPDPtr parton0, const tcPDPtr parton1, tcBeamPtr beam) const
 Veto on the PDF for the initial-state shower. More...
 
double PDFVetoRatio (const Energy2 t, const double x, const tcPDPtr parton0, const tcPDPtr parton1, tcBeamPtr beam, double factor) const
 The PDF veto ratio.
 
bool SplittingFnVeto (const Energy2 t, const IdList &ids, const bool mass, const RhoDMatrix &rho, double detune) const
 The veto on the splitting function. More...
 
double SplittingFnVetoRatio (const Energy2 t, const IdList &ids, const bool mass, const RhoDMatrix &rho, double detune) const
 The Splitting function veto ratio.
 
bool alphaSVeto (Energy2 pt2) const
 The veto on the coupling constant. More...
 
double alphaSVetoRatio (Energy2 pt2, double factor) const
 The alpha S veto ratio.
 
void z (double in)
 Methods to set the kinematic variables for the branching. More...
 
void phi (double in)
 The azimuthal angle.
 
void pT (Energy in)
 The transverse momentum.
 
pair< double, double > zLimits () const
 Set/Get the limits on the energy fraction for the splitting. More...
 
void zLimits (pair< double, double > in)
 Set the limits.
 
- Protected Member Functions inherited from ThePEG::Interfaced
void reporeg (IBPtr object, string name) const
 
bool setDefaultReference (PtrT &ptr, string classname, string objectname)
 
 Interfaced (const string &newName)
 
 Interfaced (const Interfaced &i)
 
void setGenerator (tEGPtr generator)
 
- Protected Member Functions inherited from ThePEG::InterfacedBase
 InterfacedBase (string newName)
 
 InterfacedBase (const InterfacedBase &i)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinitrun ()
 
virtual void dofinish ()
 
virtual IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinitrun ()
 
virtual void dofinish ()
 
virtual IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
- Protected Member Functions inherited from ThePEG::Pointer::ReferenceCounted
 ReferenceCounted (const ReferenceCounted &)
 
ReferenceCountedoperator= (const ReferenceCounted &)
 
 ReferenceCounted (const ReferenceCounted &)
 
ReferenceCountedoperator= (const ReferenceCounted &)
 
- Protected Member Functions inherited from ThePEG::Named
const Namedoperator= (const Named &other)
 
const string & name (const string &newName)
 

Private Member Functions

QTildeSudakovoperator= (const QTildeSudakov &)
 The assignment operator is private and must never be called. More...
 

Private Attributes

Energy q_
 The evolution scale, $\tilde{q}$.
 
IdList ids_
 The Ids of the particles in the current branching.
 
vector< Energy > masses_
 The masses of the particles in the current branching.
 
vector< Energy2 > masssquared_
 The mass squared of the particles in the current branching.
 

Additional Inherited Members

- Public Types inherited from ThePEG::InterfacedBase
enum  InitState
 
- Public Types inherited from ThePEG::Pointer::ReferenceCounted
typedef unsigned int CounterType
 
- Public Attributes inherited from ThePEG::InterfacedBase
 initializing
 
 uninitialized
 
 initialized
 
 runready
 
- Public Attributes inherited from ThePEG::Pointer::ReferenceCounted
const unsigned long uniqueId
 
- Static Protected Member Functions inherited from ThePEG::Interfaced
static void registerRepository (IBPtr)
 
static void registerRepository (IBPtr, string newName)
 

Detailed Description

The QTildeSudakov class implements the Sudakov form factor for evolution in $\tilde{q}^2$ using the veto algorithm.

See also
The interfaces defined for QTildeSudakov.

Definition at line 29 of file QTildeSudakov.h.

Member Function Documentation

◆ clone()

virtual IBPtr Herwig::QTildeSudakov::clone ( ) const
inlineprotectedvirtual

Make a simple clone of this object.

Returns
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 248 of file QTildeSudakov.h.

◆ computeSpaceLikeLimits()

bool Herwig::QTildeSudakov::computeSpaceLikeLimits ( Energy2 &  scale,
double  x 
)
protected

Compute the limits on $z$ for space-like branching.

Parameters
scaleThe scale of the particle
xThe energy fraction of the parton
Returns
True if lower limit less than upper, otherwise false

◆ computeTimeLikeLimits()

bool Herwig::QTildeSudakov::computeTimeLikeLimits ( Energy2 &  scale)
protected

Compute the limits on $z$ for time-like branching.

Parameters
scaleThe scale of the particle
Returns
True if lower limit less than upper, otherwise false

◆ fullclone()

virtual IBPtr Herwig::QTildeSudakov::fullclone ( ) const
inlineprotectedvirtual

Make a clone of this object, possibly modifying the cloned object to make it sane.

Returns
a pointer to the new object.

Reimplemented from ThePEG::InterfacedBase.

Definition at line 254 of file QTildeSudakov.h.

◆ generateNextDecayBranching()

virtual ShoKinPtr Herwig::QTildeSudakov::generateNextDecayBranching ( const Energy  startingScale,
const Energy  stoppingScale,
const Energy  minmass,
const IdList ids,
const RhoDMatrix rho,
double  enhance,
double  detuning 
)
virtual

Return the scale of the next space-like decay branching.

If there is no branching then it returns ZERO.

Parameters
startingScalestarting scale for the evolution
stoppingScalestopping scale for the evolution
minmassThe minimum mass allowed for the spake-like particle.
idsThe PDG codes of the particles in the splitting defined.
enhanceThe radiation enhancement factor

Implements Herwig::SudakovFormFactor.

◆ generateNextSpaceBranching()

virtual ShoKinPtr Herwig::QTildeSudakov::generateNextSpaceBranching ( const Energy  startingScale,
const IdList ids,
double  x,
const RhoDMatrix rho,
double  enhance,
tcBeamPtr  beam,
double  detuning 
)
virtual

Return the scale of the next space-like branching.

If there is no branching then it returns ZERO.

Parameters
startingScalestarting scale for the evolution
idsThe PDG codes of the particles in the splitting
xThe fraction of the beam momentum defined.
enhanceThe radiation enhancement factor
beamThe beam particle

Implements Herwig::SudakovFormFactor.

◆ generateNextTimeBranching()

virtual ShoKinPtr Herwig::QTildeSudakov::generateNextTimeBranching ( const Energy  startingScale,
const IdList ids,
const RhoDMatrix rho,
double  enhance,
double  detuning,
Energy2  maxQ2 
)
virtual

Members to generate the scale of the next branching.

Return the scale of the next time-like branching. If there is no branching then it returns ZERO.

Parameters
startingScalestarting scale for the evolution
idsThe PDG codes of the particles in the splitting
enhanceThe radiation enhancement factor
maxQ2The maximum $Q^2$ for the emission

Implements Herwig::SudakovFormFactor.

◆ generatePhiBackward()

virtual double Herwig::QTildeSudakov::generatePhiBackward ( ShowerParticle particle,
const IdList ids,
ShoKinPtr  kinematics,
const RhoDMatrix rho 
)
virtual

Generate the azimuthal angle of the branching for backward branching.

Parameters
particleThe branching particle
idsThe PDG codes of the particles in the branchings
TheShower kinematics

Implements Herwig::SudakovFormFactor.

◆ generatePhiDecay()

virtual double Herwig::QTildeSudakov::generatePhiDecay ( ShowerParticle particle,
const IdList ids,
ShoKinPtr  kinematics,
const RhoDMatrix rho 
)
virtual

Generate the azimuthal angle of the branching for ISR in decays.

Parameters
particleThe branching particle
idsThe PDG codes of the particles in the branchings
TheShower kinematics

Implements Herwig::SudakovFormFactor.

◆ generatePhiForward()

virtual double Herwig::QTildeSudakov::generatePhiForward ( ShowerParticle particle,
const IdList ids,
ShoKinPtr  kinematics,
const RhoDMatrix rho 
)
virtual

Generate the azimuthal angle of the branching for forward branching.

Parameters
particleThe branching particle
idsThe PDG codes of the particles in the branchings
TheShower kinematics

Implements Herwig::SudakovFormFactor.

◆ guessDecay()

bool Herwig::QTildeSudakov::guessDecay ( Energy2 &  t,
Energy2  tmax,
Energy  minmass,
double  enhance,
double  detune 
)
protected

Value of the energy fraction and scale for time-like branching.

Parameters
tThe scale
tmaxThe maximum scale
minmassThe minimum mass of the particle after the branching
enhanceThe radiation enhancement factor

◆ guessSpaceLike()

bool Herwig::QTildeSudakov::guessSpaceLike ( Energy2 &  t,
Energy2  tmin,
const double  x,
double  enhance,
double  detune 
)
protected

Value of the energy fraction and scale for space-like branching.

Parameters
tThe scale
tminThe minimum scale
xFraction of the beam momentum.
enhanceThe radiation enhancement factor

◆ guessTimeLike()

bool Herwig::QTildeSudakov::guessTimeLike ( Energy2 &  t,
Energy2  tmin,
double  enhance,
double  detune 
)
protected

Methods to provide the next value of the scale before the vetos are applied.

Value of the energy fraction and scale for time-like branching

Parameters
tThe scale
tminThe minimum scale
enhanceThe radiation enhancement factor
Returns
False if scale less than minimum, true otherwise

◆ Init()

static void Herwig::QTildeSudakov::Init ( )
static

The standard Init function used to initialize the interfaces.

Called exactly once for each class by the class description system before the main function starts or when this class is dynamically loaded.

◆ initialize()

void Herwig::QTildeSudakov::initialize ( const IdList ids,
Energy2 &  tmin 
)
protected

Initialize the values of the cut-offs and scales.

Parameters
tminThe minimum scale
idsThe ids of the partics in the branching

◆ operator=()

QTildeSudakov& Herwig::QTildeSudakov::operator= ( const QTildeSudakov )
private

The assignment operator is private and must never be called.

In fact, it should not even be implemented.

◆ persistentInput()

void Herwig::QTildeSudakov::persistentInput ( PersistentIStream is,
int  version 
)

Function used to read in object persistently.

Parameters
isthe persistent input stream read from.
versionthe version number of the object when written.

◆ persistentOutput()

void Herwig::QTildeSudakov::persistentOutput ( PersistentOStream os) const

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ PSVeto()

bool Herwig::QTildeSudakov::PSVeto ( const Energy2  t,
const Energy2  maxQ2 
)
protected

Phase Space veto member to implement the $\Theta$ function as a veto so that the emission is within the allowed phase space.

Parameters
tThe scale
maxQ2The maximum virtuality
Returns
true if vetoed

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