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Herwig  7.2.1
Herwig::SMWDecayer Class Reference

The SMWDecayer is designed to perform the decay of the W boson to the Standard Model fermions, including the first order electroweak corrections. More...

#include <SMWDecayer.h>

Inheritance diagram for Herwig::SMWDecayer:

Public Member Functions

 SMWDecayer ()
 Default constructor.
 
virtual bool hasMECorrection ()
 Virtual members to be overridden by inheriting classes which implement hard corrections. More...
 
virtual void initializeMECorrection (RealEmissionProcessPtr, double &, double &)
 Initialize the ME correction.
 
virtual bool softMatrixElementVeto (PPtr parent, PPtr progenitor, const bool &fs, const Energy &highestpT, const vector< tcPDPtr > &ids, const double &z, const Energy &scale, const Energy &pT)
 Apply the soft matrix element correction. More...
 
virtual POWHEGType hasPOWHEGCorrection ()
 Has a POWHEG style correction.
 
virtual int modeNumber (bool &cc, tcPDPtr parent, const tPDVector &children) const
 Which of the possible decays is required. More...
 
virtual double me2 (const int ichan, const Particle &part, const ParticleVector &decay, MEOption meopt) const
 Return the matrix element squared for a given mode and phase-space channel. More...
 
virtual void dataBaseOutput (ofstream &os, bool header) const
 Output the setup information for the particle database. 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::PerturbativeDecayer
 PerturbativeDecayer ()
 The default constructor.
 
virtual RealEmissionProcessPtr generateHardest (RealEmissionProcessPtr)
 Member to generate the hardest emission in the POWHEG scheme.
 
virtual RealEmissionProcessPtr applyHardMatrixElementCorrection (RealEmissionProcessPtr)
 Apply the hard matrix element correction to a given hard process or decay.
 
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::DecayIntegrator
 DecayIntegrator ()
 Default constructor.
 
virtual bool accept (tcPDPtr parent, const tPDVector &children) const
 Check if this decayer can perfom the decay for a particular mode. More...
 
virtual ParticleVector decay (const Particle &parent, const tPDVector &children) const
 For a given decay mode and a given particle instance, perform the decay and return the decay products. More...
 
int imode () const
 The mode being used for this decay.
 
void addMode (DecayPhaseSpaceModePtr mode, double maxwgt, const vector< double > wgts) const
 Add a phase-space mode to the list. More...
 
DecayMEPtr ME () const
 The helicity amplitude matrix element for spin correlations.
 
virtual bool twoBodyMEcode (const DecayMode &, int &mecode, double &coupling) const
 Specify the $1\to2$ matrix element to be used in the running width calculation. More...
 
virtual WidthCalculatorBasePtr threeBodyMEIntegrator (const DecayMode &dm) const
 Method to return an object to calculate the 3 (or higher body) partial width. More...
 
virtual double threeBodyMatrixElement (const int imode, const Energy2 q2, const Energy2 s3, const Energy2 s2, const Energy2 s1, const Energy m1, const Energy m2, const Energy m3) const
 The matrix element to be integrated for the three-body decays as a function of the invariant masses of pairs of the outgoing particles. More...
 
virtual InvEnergy threeBodydGammads (const int imode, const Energy2 q2, const Energy2 s, const Energy m1, const Energy m2, const Energy m3) const
 The differential three body decay rate with one integral performed. More...
 
void setPartialWidth (const DecayMode &dm, int imode)
 Set the code for the partial width. More...
 
int findMode (const DecayMode &dm)
 Finds the phase-space mode corresponding to a given decay mode. More...
 
Energy epsilonPS () const
 Access to the epsilon parameter.
 
ParticleVector generatePhotons (const Particle &p, ParticleVector children)
 Members for the generation of QED radiation in the decays. More...
 
bool canGeneratePhotons ()
 check if photons can be generated in the decay
 
virtual double oneLoopVirtualME (unsigned int imode, const Particle &part, const ParticleVector &products)
 The one-loop virtual correction. More...
 
bool hasOneLoopME ()
 Whether or not the one loop matrix element is implemented.
 
virtual InvEnergy2 realEmissionME (unsigned int imode, const Particle &part, ParticleVector &products, unsigned int iemitter, double ctheta, double stheta, const LorentzRotation &rot1, const LorentzRotation &rot2)
 The real emission matrix element. More...
 
bool hasRealEmissionME ()
 Whether or not the real emission matrix element is implemented.
 
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::HwDecayerBase
 HwDecayerBase ()
 The default constructor.
 
virtual bool accept (const DecayMode &dm) const
 Check if this decayer can perfom the decay specified by the given decay mode. More...
 
virtual ParticleVector decay (const DecayMode &dm, const Particle &p) const
 Perform a decay for a given DecayMode and a given Particle instance. More...
 
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...
 
bool initialize () const
 Access to the initialize variable.
 
bool databaseOutput () const
 Access the database output variable.
 
- Public Member Functions inherited from ThePEG::Decayer
Ptr< Amplitude >::pointer amplitude () const
 
virtual bool needsFullStep () const
 
virtual ParticleVector decay (const DecayMode &dm, const Particle &p, Step &step) const
 
virtual double brat (const DecayMode &dm, const ParticleData &pd, double oldbrat) const
 
virtual double brat (const DecayMode &dm, const Particle &p, double oldbrat) const
 
virtual ParticleVector getChildren (const DecayMode &dm, const Particle &parent) const
 
virtual void finalBoost (const Particle &parent, const ParticleVector &children) const
 
virtual void setScales (const Particle &parent, const ParticleVector &children) const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
virtual bool needsFullStep () const
 
virtual ParticleVector decay (const DecayMode &dm, const Particle &p, Step &step) const
 
virtual double brat (const DecayMode &dm, const ParticleData &pd, double oldbrat) const
 
virtual double brat (const DecayMode &dm, const Particle &p, double oldbrat) const
 
virtual ParticleVector getChildren (const DecayMode &dm, const Particle &parent) const
 
virtual void finalBoost (const Particle &parent, const ParticleVector &children) const
 
virtual void setScales (const Particle &parent, const ParticleVector &children) const
 
void persistentOutput (PersistentOStream &os) const
 
void persistentInput (PersistentIStream &is, int version)
 
- Public Member Functions inherited from HandlerBaseT< UseRandom >
double rnd () const
 
double rnd (double xu) const
 
double rnd (double xl, double xu) const
 
bool rndbool () const
 
bool rndbool (double p) const
 
bool rndbool (double p1, double p2) const
 
int rndsign (double p1, double p2, double p3) const
 
int rnd2 (double p0, double p1) const
 
int rnd3 (double p0, double p1, double p2) const
 
int rnd4 (double p0, double p1, double p2, double p3) const
 
long irnd (long xu=2) const
 
long irnd (long xl, long xu) const
 
const StandardModelBase & SM () const
 
tSMPtr standardModel () const
 
- 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())
 
 Named (const Named &)=default
 
const string & name () const
 
bool operator== (const Named &other) const
 
bool operator< (const Named &other) const
 

Static Public Member Functions

static void Init ()
 Standard Init function used to initialize the interfaces.
 
- Static Public Member Functions inherited from Herwig::PerturbativeDecayer
static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- Static Public Member Functions inherited from Herwig::DecayIntegrator
static void Init ()
 Standard Init function used to initialize the interfaces.
 
- Static Public Member Functions inherited from Herwig::HwDecayerBase
static void Init ()
 The standard Init function used to initialize the interfaces. More...
 
- Static Public Member Functions inherited from ThePEG::Decayer
static ParticleVector DecayParticle (tPPtr parent, Step &step, long maxtry=1000)
 
static void Init ()
 
- Static Public Member Functions inherited from ThePEG::HandlerBase
static void Init ()
 
- 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 setRho (double)
 Set the $\rho$ parameter.
 
void setKtildeSymm ()
 Set the $\tilde{\kappa}$ parameters symmetrically.
 
void setKtilde2 ()
 Set second $\tilde{\kappa}$, given the first.
 
void getXXbar (double kt, double z, double &x, double &xbar)
 Calculate $x_{q},x_{\bar{q}}$ from $\tilde{\kappa},z$. More...
 
double u (double)
 ????
 
double calculateRealEmission (double x1, double x2, vector< PPtr > hardProcess, double phi, double muj, double muk, int iemit, bool subtract) const
 Real emission term, for use in generating the hardest emission.
 
double meRatio (vector< cPDPtr > partons, vector< Lorentz5Momentum > momenta, unsigned int iemitter, bool subtract) const
 Calculate the ratio between NLO & LO ME.
 
virtual double matrixElementRatio (const Particle &inpart, const ParticleVector &decay2, const ParticleVector &decay3, MEOption meopt, ShowerInteraction inter)
 Calculate matrix element ratio R/B.
 
double loME (const vector< cPDPtr > &partons, const vector< Lorentz5Momentum > &momenta) const
 Calculate the LO ME.
 
InvEnergy2 realME (const vector< cPDPtr > &partons, const vector< Lorentz5Momentum > &momenta, ShowerInteraction inter) const
 Calculate the NLO real emission piece of ME.
 
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...
 
Standard Interfaced functions.
virtual void doinit ()
 Initialize this object after the setup phase before saving and EventGenerator to disk. More...
 
virtual void doinitrun ()
 Initialize this object. More...
 
double getZfromX (double, double)
 Translate the variables from $x_q,x_{\bar{q}}$ to $\tilde{\kappa},z$. More...
 
double getKfromX (double, double)
 Calculate $\tilde{\kappa}$.
 
double qWeight (double x, double xbar)
 Soft weight. More...
 
double qbarWeight (double x, double xbar)
 Soft antiquark weight calculated from $x_{q},x_{\bar{q}}$. More...
 
double qWeightX (Energy qtilde, double z)
 Soft quark weight calculated from $\tilde{q},z$. More...
 
double qbarWeightX (Energy qtilde, double z)
 Soft antiquark weight calculated from $\tilde{q},z$. More...
 
double MEV (double, double)
 Vector and axial vector parts of the matrix element. More...
 
double MEA (double, double)
 Axial vector part of the matrix element.
 
double PS (double x1, double x2)
 The matrix element, given $x_1$, $x_2$. More...
 
- Protected Member Functions inherited from Herwig::PerturbativeDecayer
bool identifyDipoles (vector< DipoleType > &dipoles, PPtr &aProgenitor, PPtr &bProgenitor, PPtr &cProgenitor, ShowerInteraction inter) const
 Work out the type of process.
 
ShowerAlphaPtr alphaS ()
 Coupling for the generation of hard QCD radiation.
 
ShowerAlphaPtr alphaEM ()
 Coupling for the generation of hard QED radiation.
 
vector< Lorentz5Momentum > hardMomenta (PPtr in, PPtr emitter, PPtr spectator, const vector< DipoleType > &dipoles, int i, bool inDeadZone)
 Return the momenta including the hard emission.
 
bool calcMomenta (int j, Energy pT, double y, double phi, double &xg, double &xs, double &xe, double &xe_z, vector< Lorentz5Momentum > &particleMomenta)
 Calculate momenta of all the particles.
 
bool psCheck (const double xg, const double xs)
 Check the calculated momenta are physical.
 
pair< double, double > calculateDipole (const DipoleType &dipoleId, const Particle &inpart, const ParticleVector &decay3)
 Return dipole corresponding to the DipoleType dipoleId.
 
double dipoleSpinFactor (tcPDPtr emitter, double z)
 Return contribution to dipole that depends on the spin of the emitter.
 
double colourCoeff (tcPDPtr emitter, tcPDPtr spectator, tcPDPtr other, DipoleType dipole)
 Return the colour coefficient of the dipole.
 
void getColourLines (RealEmissionProcessPtr real)
 Set up the colour lines.
 
RealEmissionProcessPtr getHardEvent (RealEmissionProcessPtr born, bool inDeadZone, ShowerInteraction inter)
 Generate a hard emission.
 
bool inTotalDeadZone (double xg, double xs, const vector< DipoleType > &dipoles, int i)
 Is the $x_g,x_s$ point in the dead-zone for all the dipoles.
 
phaseSpaceRegion inInitialFinalDeadZone (double xg, double xa, double a, double c) const
 Is the $x_g,x_a$ point in the dead-zone for an initial-final colour connection.
 
phaseSpaceRegion inFinalFinalDeadZone (double xb, double xc, double b, double c) const
 Is the $x_b,x_c$ point in the dead-zone for a final-final colour connection.
 
bool useMEforT2 () const
 For me corrections use the shower or me for the T2 region.
 
const Energy & pT () const
 Access to the kinematics for inheriting classes. More...
 
const Energy & mb () const
 Mass of decaying particle.
 
const double & e () const
 Reduced mass of emitter child particle.
 
const double & s () const
 Reduced mass of spectator child particle.
 
const double & e2 () const
 Reduced mass of emitter child particle squared.
 
const double & s2 () const
 Reduced mass of spectator child particle squared.
 
- Protected Member Functions inherited from Herwig::DecayIntegrator
ParticleVector generate (bool inter, bool cc, const unsigned int &imode, const Particle &inpart) const
 Generate the momenta for the decay. More...
 
void imode (int in)
 Set the mode being use for this decay.
 
void ME (DecayMEPtr in) const
 Set the helicity matrix element for the decay.
 
void resetIntermediate (tcPDPtr part, Energy mass, Energy width)
 Reset the properities of all intermediates. More...
 
unsigned int numberModes () const
 Number of decay modes.
 
tDecayPhaseSpaceModePtr mode (unsigned int)
 Pointer to a mode.
 
tcDecayPhaseSpaceModePtr mode (unsigned int) const
 Pointer to a mode.
 
bool generateIntermediates () const
 Get whether or not the intermediates are included.
 
void generateIntermediates (bool in)
 Set whether or not the intermediates are included.
 
Energy initializePhaseSpaceMode (unsigned int imode, bool init, bool onShell=false) const
 Initialize the phase-space mode. More...
 
void hasOneLoopME (bool in)
 Whether or not the one loop matrix element is implemented.
 
void hasRealEmissionME (bool in)
 Whether or not the real emission matrix element is implemented.
 
void epsilonPS (Energy in)
 Set the epsilon parameter.
 
void clearModes ()
 Clear the models.
 
- Protected Member Functions inherited from Herwig::HwDecayerBase
void fixRho (RhoDMatrix &) const
 Set rho to be diagonal if no correlations.
 
virtual void dofinish ()
 Finalize this object. More...
 
- 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 IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
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

SMWDecayeroperator= (const SMWDecayer &)=delete
 Private and non-existent assignment operator.
 

Private Attributes

AbstractFFVVertexPtr FFWVertex_
 Pointer to the fermion-antifermion W vertex.
 
AbstractFFVVertexPtr FFGVertex_
 Pointer to the fermion-antifermion G vertex.
 
AbstractFFVVertexPtr FFPVertex_
 Pointer to the fermion-antifermion G vertex.
 
AbstractVVVVertexPtr WWWVertex_
 Pointer to the fermion-antifermion G vertex.
 
RhoDMatrix rho_
 Spin density matrix for the decay.
 
vector< VectorWaveFunctionvectors_
 Polarization vectors for the decay.
 
vector< SpinorWaveFunctionwave_
 Spinors for the decay.
 
vector< SpinorBarWaveFunctionwavebar_
 Barred spinors for the decay.
 
Energy d_Q_
 CM energy.
 
Energy d_m_
 Quark mass.
 
double d_rho_
 The rho parameter.
 
double d_v_
 The v parameter.
 
double d_kt1_
 The initial kappa-tilde values for radiation from the quark.
 
double d_kt2_
 The initial kappa-tilde values for radiation from the antiquark.
 
double CF_
 The colour factor.
 
Energy mW_
 The W mass.
 
double aS_
 The strong coupling.
 
Energy2 scale_
 The scale.
 
bool NLO_
 Whether ro return the LO or NLO result.
 
vector< double > quarkWeight_
 maximum weights for the different integrations More...
 
vector< double > leptonWeight_
 Weights for the W to leptons decays.
 
tcPDPtr gluon_
 Stuff for the POWHEG correction. More...
 
vector< tcPDPtrpartons_
 The ParticleData objects for the fermions.
 
vector< Lorentz5Momentum > quark_
 The fermion momenta.
 
Lorentz5Momentum gauge_
 The momentum of the radiated gauge boson.
 
PPtr wboson_
 The W boson.
 
Energy2 mw2_
 W mass squared.
 

Static Private Attributes

static const double EPS_
 Cut-off parameter.
 

Additional Inherited Members

- Public Types inherited from Herwig::DecayIntegrator
enum  MEOption { Initialize, Calculate, Terminate }
 Enum for the matrix element option.
 
- Public Types inherited from Herwig::HwDecayerBase
enum  POWHEGType { No, ISR, FSR, Both }
 Virtual members to be overridden by inheriting classes which implement hard corrections. More...
 
- 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
 
- Protected Types inherited from Herwig::PerturbativeDecayer
enum  dipoleType {
  FFa, FFc, IFa, IFc,
  IFba, IFbc, FFg
}
 Type of dipole.
 
enum  phaseSpaceRegion {
  emissionFromB, emissionFromC, emissionFromA1, emissionFromA2,
  deadZone
}
 Phase-space region for an emission (assumes $a\to b,c$.
 
- Static Protected Member Functions inherited from ThePEG::Interfaced
static void registerRepository (IBPtr)
 
static void registerRepository (IBPtr, string newName)
 

Detailed Description

The SMWDecayer is designed to perform the decay of the W boson to the Standard Model fermions, including the first order electroweak corrections.

See also
PerturbativeDecayer

Definition at line 32 of file SMWDecayer.h.

Member Function Documentation

◆ clone()

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

Make a simple clone of this object.

Returns
a pointer to the new object.

Implements ThePEG::InterfacedBase.

Definition at line 145 of file SMWDecayer.h.

◆ dataBaseOutput()

virtual void Herwig::SMWDecayer::dataBaseOutput ( ofstream &  os,
bool  header 
) const
virtual

Output the setup information for the particle database.

Parameters
osThe stream to output the information to
headerWhether or not to output the information for MySQL

Reimplemented from Herwig::DecayIntegrator.

◆ doinit()

virtual void Herwig::SMWDecayer::doinit ( )
protectedvirtual

Initialize this object after the setup phase before saving and EventGenerator to disk.

Exceptions
InitExceptionif object could not be initialized properly.

Reimplemented from ThePEG::InterfacedBase.

◆ doinitrun()

virtual void Herwig::SMWDecayer::doinitrun ( )
protectedvirtual

Initialize this object.

Called in the run phase just before a run begins.

Reimplemented from Herwig::DecayIntegrator.

◆ fullclone()

virtual IBPtr Herwig::SMWDecayer::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 151 of file SMWDecayer.h.

◆ getXXbar()

void Herwig::SMWDecayer::getXXbar ( double  kt,
double  z,
double &  x,
double &  xbar 
)
protected

Calculate $x_{q},x_{\bar{q}}$ from $\tilde{\kappa},z$.

Parameters
kt$\tilde{\kappa}$
z$z$
x$x_{q}$
xbar$x_{\bar{q}}$

◆ getZfromX()

double Herwig::SMWDecayer::getZfromX ( double  ,
double   
)
protected

Translate the variables from $x_q,x_{\bar{q}}$ to $\tilde{\kappa},z$.

Calculate $z$.

◆ hasMECorrection()

virtual bool Herwig::SMWDecayer::hasMECorrection ( )
inlinevirtual

Virtual members to be overridden by inheriting classes which implement hard corrections.

Has an old fashioned ME correction

Reimplemented from Herwig::HwDecayerBase.

Definition at line 51 of file SMWDecayer.h.

◆ me2()

virtual double Herwig::SMWDecayer::me2 ( const int  ichan,
const Particle part,
const ParticleVector decay,
MEOption  meopt 
) const
virtual

Return the matrix element squared for a given mode and phase-space channel.

Parameters
ichanThe channel we are calculating the matrix element for.
partThe decaying Particle.
decayThe particles produced in the decay.
meoptOption for the calculation of the matrix element
Returns
The matrix element squared for the phase-space configuration.

Implements Herwig::DecayIntegrator.

◆ MEV()

double Herwig::SMWDecayer::MEV ( double  ,
double   
)
protected

Vector and axial vector parts of the matrix element.

Vector part of the matrix element

◆ modeNumber()

virtual int Herwig::SMWDecayer::modeNumber ( bool &  cc,
tcPDPtr  parent,
const tPDVector children 
) const
virtual

Which of the possible decays is required.

Parameters
ccIs this mode the charge conjugate
parentThe decaying particle
childrenThe decay products

Implements Herwig::DecayIntegrator.

◆ persistentInput()

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

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ PS()

double Herwig::SMWDecayer::PS ( double  x1,
double  x2 
)
protected

The matrix element, given $x_1$, $x_2$.

Parameters
x1$x_1$
x2$x_2$

◆ qbarWeight()

double Herwig::SMWDecayer::qbarWeight ( double  x,
double  xbar 
)
protected

Soft antiquark weight calculated from $x_{q},x_{\bar{q}}$.

Parameters
x$x_{q}$
xbar$x_{\bar{q}}$

◆ qbarWeightX()

double Herwig::SMWDecayer::qbarWeightX ( Energy  qtilde,
double  z 
)
protected

Soft antiquark weight calculated from $\tilde{q},z$.

Parameters
qtilde$\tilde{q}$
z$z$

◆ qWeight()

double Herwig::SMWDecayer::qWeight ( double  x,
double  xbar 
)
protected

Soft weight.

Soft quark weight calculated from $x_{q},x_{\bar{q}}$

Parameters
x$x_{q}$
xbar$x_{\bar{q}}$

◆ qWeightX()

double Herwig::SMWDecayer::qWeightX ( Energy  qtilde,
double  z 
)
protected

Soft quark weight calculated from $\tilde{q},z$.

Parameters
qtilde$\tilde{q}$
z$z$

◆ softMatrixElementVeto()

virtual bool Herwig::SMWDecayer::softMatrixElementVeto ( PPtr  parent,
PPtr  progenitor,
const bool &  fs,
const Energy &  highestpT,
const vector< tcPDPtr > &  ids,
const double &  z,
const Energy &  scale,
const Energy &  pT 
)
virtual

Apply the soft matrix element correction.

Parameters
parentThe initial particle in the current branching
progenitorThe progenitor particle of the jet
fsWhether the emission is initial or final-state
highestpTThe highest pT so far in the shower
idsids of the particles produced in the branching
zThe momentum fraction of the branching
scalethe evolution scale of the branching
pTThe transverse momentum of the branching
Returns
If true the emission should be vetoed

Reimplemented from Herwig::HwDecayerBase.

Member Data Documentation

◆ gluon_

tcPDPtr Herwig::SMWDecayer::gluon_
private

Stuff for the POWHEG correction.

ParticleData object for the gluon

Definition at line 442 of file SMWDecayer.h.

◆ quarkWeight_

vector<double> Herwig::SMWDecayer::quarkWeight_
private

maximum weights for the different integrations

Weights for the W to quarks decays.

Definition at line 347 of file SMWDecayer.h.


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