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Herwig  7.1.0
Herwig::DecayIntegrator Class Referenceabstract

Main class for Decayers implementing multi-channel phase space integration. More...

#include <DecayIntegrator.h>

Inheritance diagram for Herwig::DecayIntegrator:

Public Types

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 Member Functions

 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...
 
virtual int modeNumber (bool &cc, tcPDPtr parent, const tPDVector &children) const =0
 Which of the possible decays is required. 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...
 
virtual double me2 (const int ichan, const Particle &part, const ParticleVector &decay, MEOption opt) const =0
 Return the matrix element squared for a given mode and phase-space channel. 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...
 
virtual void dataBaseOutput (ofstream &os, bool header) const
 Output the setup information for the particle database. More...
 
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.
 
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::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.
 
virtual POWHEGType hasPOWHEGCorrection ()
 Has a POWHEG style correction.
 
virtual bool hasMECorrection ()
 Has an old fashioned ME correction.
 
virtual void initializeMECorrection (RealEmissionProcessPtr, double &, double &)
 Initialize the ME correction.
 
virtual RealEmissionProcessPtr applyHardMatrixElementCorrection (RealEmissionProcessPtr)
 Apply the hard matrix element correction to a given hard process or decay.
 
virtual bool softMatrixElementVeto (ShowerProgenitorPtr initial, ShowerParticlePtr parent, Branching br)
 Apply the soft matrix element correction. More...
 
virtual RealEmissionProcessPtr generateHardest (RealEmissionProcessPtr)
 Apply the POWHEG style correction.
 
- 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 IBPtr fullclone () const
 
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 ()
 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

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.
 
Standard Interfaced functions.
virtual void doinitrun ()
 Initialize this object to the begining of the run phase.
 
- Protected Member Functions inherited from Herwig::HwDecayerBase
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
virtual IBPtr clone () const=0
 
 InterfacedBase (string newName)
 
 InterfacedBase (const InterfacedBase &i)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinit ()
 
virtual IVector getReferences ()
 
virtual void rebind (const TranslationMap &)
 
virtual void readSetup (istream &is)
 
virtual void doupdate ()
 
virtual void doinit ()
 
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

DecayIntegratoroperator= (const DecayIntegrator &)
 Private and non-existent assignment operator.
 

Private Attributes

int _niter
 Number of iterations for th initialization.
 
int _npoint
 Number of points for initialisation.
 
int _ntry
 number of attempts to generate the decay
 
vector< DecayPhaseSpaceModePtr > _modes
 List of the decay modes.
 
bool _generateinter
 Whether to include the intermediates whne outputing the results.
 
DecayRadiationGeneratorPtr _photongen
 Pointer to the object generating the QED radiation in the decay.
 
int _imode
 mode currently being generated
 
DecayMEPtr _matrixelement
 The helicity matrix element for the current decay.
 
bool _realME
 Whether or not the real photon emission matrix element exists.
 
bool _virtualME
 Whether or not the one-loop matrix element exists.
 

Static Private Attributes

static AbstractClassDescription< DecayIntegratorinitDecayIntegrator
 Describe an abstract base class with persistent data.
 

Friends

class DecayPhaseSpaceMode
 and DecayPhaseMode
 
ostream & operator<< (ostream &, const DecayIntegrator &)
 The output operator is a friend, this is mainly for debugging.
 

Additional Inherited Members

- 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

Main class for Decayers implementing multi-channel phase space integration.

Author
Peter Richardson

This class is designed to be the base class for Herwig decays including the implementation of a multichannel decayer or n-body phase space decays.

The DecayIntegrator class inherits from ThePEG's Decayer class and makes use of the DecayPhaseSpaceMode class to specify a number of decay modes.

Additional modes can be added using the addMode method. In practice the phase space channels for a particular mode are usually constructed in the doinit member of a Decayer and then the modes added to the Decayer.

For the majority of the decays currently implemented the phase-space integration has been optimised and the maximum weight set. If the parameters of the decay model are changed the Initialize interface can be used to optimise the integration and calculate the maximum weight.

In classes inheriting from this the me2() member which gives the matrix element squared must be implemented. This should be combined with the setting of the phase space channels, and the setting of which channels to use and their initial weights in the doinit() member. The different decay modes should then be initialized in the initrun() member if needed. The generate member can then be called from the decay() member to generate a phase-space configuration for a decay.

See also
DecayPhaseSpaceMode
DecayPhaseSpaceChannel
The interfaces defined for DecayIntegrator.

Definition at line 62 of file DecayIntegrator.h.

Member Function Documentation

◆ accept()

virtual bool Herwig::DecayIntegrator::accept ( tcPDPtr  parent,
const tPDVector children 
) const
inlinevirtual

Check if this decayer can perfom the decay for a particular mode.

Uses the modeNumber member but can be overridden

Parameters
parentThe decaying particle
childrenThe decay products

Implements Herwig::HwDecayerBase.

Reimplemented in Herwig::SMTopDecayer, Herwig::SMHiggsGGHiggsPPDecayer, Herwig::ScalarMesonFactorizedDecayer, Herwig::TauDecayer, Herwig::SMHiggsWWDecayer, Herwig::SemiLeptonicScalarDecayer, Herwig::SMHiggsFermionsDecayer, Herwig::BaryonFactorizedDecayer, and Herwig::SemiLeptonicBaryonDecayer.

Definition at line 96 of file DecayIntegrator.h.

◆ addMode()

void Herwig::DecayIntegrator::addMode ( DecayPhaseSpaceModePtr  mode,
double  maxwgt,
const vector< double >  wgts 
) const

Add a phase-space mode to the list.

Parameters
modeThe mode being added.
maxwgtThe maximum weight for the phase space integration.
wgtsThe weights of the different channels in the multichannel approach.

◆ dataBaseOutput()

virtual void Herwig::DecayIntegrator::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

Implements Herwig::HwDecayerBase.

Reimplemented in Herwig::a1ThreePionCLEODecayer, Herwig::a1ThreePionDecayer, Herwig::VectorMeson3PionDecayer, Herwig::SMTopDecayer, Herwig::EtaPiGammaGammaDecayer, Herwig::EtaPiPiGammaDecayer, Herwig::PScalarPScalarVectorDecayer, Herwig::PScalarVectorFermionsDecayer, Herwig::VectorMesonPScalarFermionsDecayer, Herwig::SMWDecayer, Herwig::OniumToOniumPiPiDecayer, Herwig::TensorMesonVectorVectorDecayer, Herwig::SMZDecayer, Herwig::EtaPiPiPiDecayer, Herwig::Baryon1MesonDecayerBase, Herwig::VectorMeson2MesonDecayer, Herwig::VectorMesonVectorVectorDecayer, Herwig::TauDecayer, Herwig::VectorMesonVectorPScalarDecayer, Herwig::TensorMesonVectorPScalarDecayer, Herwig::PScalarVectorVectorDecayer, Herwig::TensorMeson2PScalarDecayer, Herwig::VectorMeson2FermionDecayer, Herwig::SMHiggsWWDecayer, Herwig::a1SimpleDecayer, Herwig::SU3BaryonOctetOctetPhotonDecayer, Herwig::ScalarMesonFactorizedDecayer, Herwig::ScalarVectorVectorDecayer, Herwig::SU3BaryonOctetOctetScalarDecayer, Herwig::ScalarMesonTensorScalarDecayer, Herwig::ScalarScalarScalarDecayer, Herwig::SemiLeptonicScalarDecayer, Herwig::SU3BaryonSingletOctetPhotonDecayer, Herwig::PScalar4FermionsDecayer, Herwig::PVectorMesonVectorPScalarDecayer, Herwig::VectorMesonVectorScalarDecayer, Herwig::SU3BaryonOctetDecupletScalarDecayer, Herwig::SMHiggsFermionsDecayer, Herwig::BaryonFactorizedDecayer, Herwig::PScalarLeptonNeutrinoDecayer, Herwig::SU3BaryonSingletOctetScalarDecayer, Herwig::VectorMesonPVectorPScalarDecayer, Herwig::SU3BaryonDecupletOctetPhotonDecayer, Herwig::DtoKPiPiCLEO, Herwig::SU3BaryonDecupletOctetScalarDecayer, Herwig::DtoKPiPiMarkIII, Herwig::DtoKPiPiE691, Herwig::SemiLeptonicBaryonDecayer, Herwig::RadiativeHeavyBaryonDecayer, Herwig::NonLeptonicHyperonDecayer, Herwig::KornerKramerCharmDecayer, Herwig::NonLeptonicOmegaDecayer, Herwig::RadiativeHyperonDecayer, Herwig::OmegaXiStarPionDecayer, and Herwig::StrongHeavyBaryonDecayer.

◆ decay()

virtual ParticleVector Herwig::DecayIntegrator::decay ( const Particle parent,
const tPDVector children 
) const
virtual

For a given decay mode and a given particle instance, perform the decay and return the decay products.

As this is the base class this is not implemented.

Returns
The vector of particles produced in the decay.

Implements Herwig::HwDecayerBase.

Reimplemented in Herwig::SMTopDecayer, Herwig::SMHiggsGGHiggsPPDecayer, Herwig::SMHiggsWWDecayer, Herwig::GeneralTwoBodyDecayer, Herwig::SMHiggsFermionsDecayer, Herwig::GeneralThreeBodyDecayer, and Herwig::GeneralFourBodyDecayer.

◆ findMode()

int Herwig::DecayIntegrator::findMode ( const DecayMode dm)

Finds the phase-space mode corresponding to a given decay mode.

Parameters
dmThe DecayMode

◆ generate()

ParticleVector Herwig::DecayIntegrator::generate ( bool  inter,
bool  cc,
const unsigned int &  imode,
const Particle inpart 
) const
protected

Generate the momenta for the decay.

Parameters
interGenerate the intermediates produced in the decay as well as the final particles.
ccIs this the mode defined or its charge conjugate.
imodeThe mode being generated.
inpartThe decaying particle.
Returns
The particles produced inthe decay.

◆ generatePhotons()

ParticleVector Herwig::DecayIntegrator::generatePhotons ( const Particle p,
ParticleVector  children 
)
inline

Members for the generation of QED radiation in the decays.

Use the DecayRadiationGenerator to generate photons in the decay.

Parameters
pThe Particle instance being decayed
childrenThe decay products
Returns
A particle vector containing the decay products after the generation of photons.

Definition at line 239 of file DecayIntegrator.h.

◆ initializePhaseSpaceMode()

Energy Herwig::DecayIntegrator::initializePhaseSpaceMode ( unsigned int  imode,
bool  init,
bool  onShell = false 
) const
protected

Initialize the phase-space mode.

Parameters
imodeThe mode
initWhether or not to perform the initialization

◆ me2()

virtual double Herwig::DecayIntegrator::me2 ( const int  ichan,
const Particle part,
const ParticleVector decay,
MEOption  opt 
) const
pure virtual

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

This function is purely virtual and must be implemented in classes inheriting from DecayIntegrator.

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

Implemented in Herwig::a1ThreePionCLEODecayer, Herwig::a1ThreePionDecayer, Herwig::VectorMeson3PionDecayer, Herwig::SMTopDecayer, Herwig::SMWDecayer, Herwig::SMZDecayer, Herwig::EtaPiGammaGammaDecayer, Herwig::TauDecayer, Herwig::VectorMesonVectorVectorDecayer, Herwig::TensorMesonVectorVectorDecayer, Herwig::GeneralTwoBodyDecayer, Herwig::EtaPiPiGammaDecayer, Herwig::SMHiggsWWDecayer, Herwig::ScalarMesonFactorizedDecayer, Herwig::VectorMeson2MesonDecayer, Herwig::Baryon1MesonDecayerBase, Herwig::PScalarVectorFermionsDecayer, Herwig::VectorMesonPScalarFermionsDecayer, Herwig::VectorMesonVectorPScalarDecayer, Herwig::TensorMesonVectorPScalarDecayer, Herwig::PScalarVectorVectorDecayer, Herwig::TensorMeson2PScalarDecayer, Herwig::VectorMeson2FermionDecayer, Herwig::SemiLeptonicScalarDecayer, Herwig::OniumToOniumPiPiDecayer, Herwig::SemiLeptonicBaryonDecayer, Herwig::EtaPiPiPiDecayer, Herwig::PScalar4FermionsDecayer, Herwig::PVectorMesonVectorPScalarDecayer, Herwig::VectorMesonVectorScalarDecayer, Herwig::SMHiggsFermionsDecayer, Herwig::BaryonFactorizedDecayer, Herwig::PScalarLeptonNeutrinoDecayer, Herwig::PScalarPScalarVectorDecayer, Herwig::ScalarVectorVectorDecayer, Herwig::SMHiggsGGHiggsPPDecayer, Herwig::ScalarMesonTensorScalarDecayer, Herwig::ScalarScalarScalarDecayer, Herwig::VectorMesonPVectorPScalarDecayer, Herwig::GeneralCurrentDecayer, Herwig::DtoKPiPiCLEO, Herwig::a1SimpleDecayer, Herwig::SVVDecayer, Herwig::FFSDecayer, Herwig::FFVDecayer, Herwig::VFFDecayer, Herwig::DtoKPiPiMarkIII, Herwig::FRVDecayer, Herwig::SFFDecayer, Herwig::SSVDecayer, Herwig::TFFDecayer, Herwig::TSSDecayer, Herwig::TVVDecayer, Herwig::VSSDecayer, Herwig::DtoKPiPiE691, Herwig::SSSDecayer, Herwig::FRSDecayer, Herwig::SRFDecayer, Herwig::VVVDecayer, Herwig::SMHiggsFermionsPOWHEGDecayer, Herwig::SMWFermionsPOWHEGDecayer, Herwig::VVSDecayer, Herwig::SMZFermionsPOWHEGDecayer, Herwig::FFVCurrentDecayer, Herwig::FtoFVVDecayer, Herwig::StoSFFDecayer, Herwig::StoFFFFDecayer, Herwig::VtoFFVDecayer, Herwig::FtoFFFDecayer, and Herwig::StoFFVDecayer.

◆ modeNumber()

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

Which of the possible decays is required.

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

Implemented in Herwig::a1ThreePionCLEODecayer, Herwig::VectorMeson3PionDecayer, Herwig::a1ThreePionDecayer, Herwig::SMWDecayer, Herwig::SMZDecayer, Herwig::SMTopDecayer, Herwig::SU3BaryonOctetOctetPhotonDecayer, Herwig::EtaPiGammaGammaDecayer, Herwig::SMHiggsGGHiggsPPDecayer, Herwig::TauDecayer, Herwig::GeneralTwoBodyDecayer, Herwig::TensorMesonVectorVectorDecayer, Herwig::SU3BaryonOctetOctetScalarDecayer, Herwig::SMHiggsWWDecayer, Herwig::EtaPiPiGammaDecayer, Herwig::SU3BaryonSingletOctetPhotonDecayer, Herwig::SU3BaryonOctetDecupletScalarDecayer, Herwig::VectorMeson2MesonDecayer, Herwig::VectorMesonVectorVectorDecayer, Herwig::SU3BaryonSingletOctetScalarDecayer, Herwig::PScalarVectorFermionsDecayer, Herwig::VectorMesonPScalarFermionsDecayer, Herwig::VectorMesonVectorPScalarDecayer, Herwig::PScalarVectorVectorDecayer, Herwig::TensorMesonVectorPScalarDecayer, Herwig::TensorMeson2PScalarDecayer, Herwig::VectorMeson2FermionDecayer, Herwig::SemiLeptonicScalarDecayer, Herwig::OniumToOniumPiPiDecayer, Herwig::EtaPiPiPiDecayer, Herwig::PScalar4FermionsDecayer, Herwig::SU3BaryonDecupletOctetPhotonDecayer, Herwig::ScalarMesonFactorizedDecayer, Herwig::SU3BaryonDecupletOctetScalarDecayer, Herwig::GeneralThreeBodyDecayer, Herwig::PVectorMesonVectorPScalarDecayer, Herwig::VectorMesonVectorScalarDecayer, Herwig::PScalarLeptonNeutrinoDecayer, Herwig::PScalarPScalarVectorDecayer, Herwig::BaryonFactorizedDecayer, Herwig::SemiLeptonicBaryonDecayer, Herwig::ScalarVectorVectorDecayer, Herwig::RadiativeHeavyBaryonDecayer, Herwig::ScalarMesonTensorScalarDecayer, Herwig::ScalarScalarScalarDecayer, Herwig::VectorMesonPVectorPScalarDecayer, Herwig::GeneralCurrentDecayer, Herwig::GeneralFourBodyDecayer, Herwig::DtoKPiPiCLEO, Herwig::a1SimpleDecayer, Herwig::DtoKPiPiMarkIII, Herwig::DtoKPiPiE691, Herwig::NonLeptonicHyperonDecayer, Herwig::SMHiggsFermionsDecayer, Herwig::KornerKramerCharmDecayer, Herwig::NonLeptonicOmegaDecayer, Herwig::RadiativeHyperonDecayer, Herwig::OmegaXiStarPionDecayer, and Herwig::StrongHeavyBaryonDecayer.

◆ oneLoopVirtualME()

virtual double Herwig::DecayIntegrator::oneLoopVirtualME ( unsigned int  imode,
const Particle part,
const ParticleVector products 
)
virtual

The one-loop virtual correction.

Parameters
imodeThe mode required.
partThe decaying particle.
productsThe decay products including the radiated photon.
Returns
Whether the correction is implemented

Reimplemented in Herwig::SMZDecayer.

◆ persistentInput()

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

Function used to write out object persistently.

Parameters
osthe persistent output stream written to.

◆ realEmissionME()

virtual InvEnergy2 Herwig::DecayIntegrator::realEmissionME ( unsigned int  imode,
const Particle part,
ParticleVector products,
unsigned int  iemitter,
double  ctheta,
double  stheta,
const LorentzRotation rot1,
const LorentzRotation rot2 
)
virtual

The real emission matrix element.

Parameters
imodeThe mode required
partThe decaying particle
productsThe decay products including the radiated photon
iemitterThe particle which emitted the photon
cthetaThe cosine of the polar angle between the photon and the emitter
sthetaThe sine of the polar angle between the photon and the emitter
rot1Rotation from rest frame to frame for real emission
rot2Rotation to place emitting particle along z

Reimplemented in Herwig::SMZDecayer.

◆ resetIntermediate()

void Herwig::DecayIntegrator::resetIntermediate ( tcPDPtr  part,
Energy  mass,
Energy  width 
)
protected

Reset the properities of all intermediates.

Parameters
partThe intermediate particle being reset.
massThe mass of the particle.
widthThe width of the particle.

◆ setPartialWidth()

void Herwig::DecayIntegrator::setPartialWidth ( const DecayMode dm,
int  imode 
)

Set the code for the partial width.

Finds the partial width in the GenericWidthGenerator class which corresponds to the decay mode.

Parameters
dmThe DecayMode
imodeThe mode.

◆ threeBodydGammads()

virtual InvEnergy Herwig::DecayIntegrator::threeBodydGammads ( const int  imode,
const Energy2  q2,
const Energy2  s,
const Energy  m1,
const Energy  m2,
const Energy  m3 
) const
virtual

The differential three body decay rate with one integral performed.

Parameters
imodeThe mode for which the matrix element is needed.
q2The scale, i.e. the mass squared of the decaying particle.
sThe invariant mass which still needs to be integrate over.
m1The mass of the first outgoing particle.
m2The mass of the second outgoing particle.
m3The mass of the third outgoing particle.
Returns
The differential rate $\frac{d\Gamma}{ds}$

Reimplemented in Herwig::SMTopDecayer, Herwig::PScalarVectorFermionsDecayer, Herwig::VectorMesonPScalarFermionsDecayer, and Herwig::EtaPiPiPiDecayer.

◆ threeBodyMatrixElement()

virtual double Herwig::DecayIntegrator::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
virtual

The matrix element to be integrated for the three-body decays as a function of the invariant masses of pairs of the outgoing particles.

Parameters
imodeThe mode for which the matrix element is needed.
q2The scale, i.e. the mass squared of the decaying particle.
s3The invariant mass squared of particles 1 and 2, $s_3=m^2_{12}$.
s2The invariant mass squared of particles 1 and 3, $s_2=m^2_{13}$.
s1The invariant mass squared of particles 2 and 3, $s_1=m^2_{23}$.
m1The mass of the first outgoing particle.
m2The mass of the second outgoing particle.
m3The mass of the third outgoing particle.
Returns
The matrix element

Reimplemented in Herwig::a1ThreePionCLEODecayer, Herwig::a1ThreePionDecayer, Herwig::VectorMeson3PionDecayer, Herwig::EtaPiGammaGammaDecayer, Herwig::EtaPiPiGammaDecayer, Herwig::OniumToOniumPiPiDecayer, Herwig::a1SimpleDecayer, and Herwig::GeneralThreeBodyDecayer.

◆ threeBodyMEIntegrator()

virtual WidthCalculatorBasePtr Herwig::DecayIntegrator::threeBodyMEIntegrator ( const DecayMode dm) const
virtual

◆ twoBodyMEcode()

virtual bool Herwig::DecayIntegrator::twoBodyMEcode ( const DecayMode ,
int &  mecode,
double &  coupling 
) const
inlinevirtual

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