Herwig 7.3.0
|
The TensorMeson2PScalarDecayer
class is designed for the decay of a tensor meson to two pseudoscalars via matrix element which takes the form.
More...
#include <TensorMeson2PScalarDecayer.h>
Public Member Functions | |
virtual int | modeNumber (bool &cc, tcPDPtr parent, const tPDVector &children) const |
Which of the possible decays is required. | |
double | me2 (const int ichan, const Particle &part, const tPDVector &outgoing, const vector< Lorentz5Momentum > &momenta, MEOption meopt) const |
Return the matrix element squared for a given mode and phase-space channel. | |
virtual void | constructSpinInfo (const Particle &part, ParticleVector outgoing) const |
Construct the SpinInfos for the particles produced in the decay. | |
bool | twoBodyMEcode (const DecayMode &dm, int &mecode, double &coupling) const |
Specify the \(1\to2\) matrix element to be used in the running width calculation. | |
virtual void | dataBaseOutput (ofstream &os, bool header) const |
Output the setup information for the particle database. | |
![]() | |
DecayIntegrator () | |
The default constructor. | |
virtual bool | accept (tcPDPtr parent, const tPDVector &children) const |
Check if this decayer can perfom the decay for a particular mode. | |
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. | |
virtual int | modeNumber (bool &cc, tcPDPtr parent, const tPDVector &children) const =0 |
Which of the possible decays is required. | |
int | imode () const |
The mode being used for this decay. | |
void | addMode (PhaseSpaceModePtr mode) const |
Add a phase-space mode to the list. | |
virtual double | me2 (const int ichan, const Particle &part, const tPDVector &outgoing, const vector< Lorentz5Momentum > &momenta, MEOption meopt) const =0 |
Return the matrix element squared for a given mode and phase-space channel. | |
virtual void | constructSpinInfo (const Particle &part, ParticleVector outgoing) const =0 |
Construct the SpinInfos for the particles produced in the decay. | |
virtual void | dataBaseOutput (ofstream &os, bool header) const |
Output the setup information for the particle database. | |
void | setPartialWidth (const DecayMode &dm, int imode) |
Set the code for the partial width. | |
virtual bool | twoBodyMEcode (const DecayMode &, int &mecode, double &coupling) const |
Specify the \(1\to2\) matrix element to be used in the running width calculation. | |
virtual WidthCalculatorBasePtr | threeBodyMEIntegrator (const DecayMode &dm) const |
Method to return an object to calculate the 3 (or higher body) partial width. | |
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. | |
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. | |
int | findMode (const DecayMode &dm) |
Finds the phase-space mode corresponding to a given decay mode. | |
ParticleVector | generatePhotons (const Particle &p, ParticleVector children) |
Members for the generation of QED radiation in the decays. | |
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. | |
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. | |
bool | hasRealEmissionME () |
Whether or not the real emission matrix element is implemented. | |
bool | warnings () const |
void | persistentOutput (PersistentOStream &os) const |
Function used to write out object persistently. | |
void | persistentInput (PersistentIStream &is, int version) |
Function used to read in object persistently. | |
![]() | |
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. | |
virtual ParticleVector | decay (const DecayMode &dm, const Particle &p) const |
Perform a decay for a given DecayMode and a given Particle instance. | |
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 (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. | |
virtual RealEmissionProcessPtr | generateHardest (RealEmissionProcessPtr) |
Apply the POWHEG style correction. | |
void | persistentOutput (PersistentOStream &os) const |
Function used to write out object persistently. | |
void | persistentInput (PersistentIStream &is, int version) |
Function used to read in object persistently. | |
bool | initialize () const |
Access to the initialize variable. | |
bool | databaseOutput () const |
Access the database output variable. | |
![]() | |
void | persistentOutput (PersistentOStream &os) const |
void | persistentInput (PersistentIStream &is, int version) |
virtual bool | accept (const DecayMode &dm) const=0 |
virtual bool | needsFullStep () const |
virtual ParticleVector | decay (const DecayMode &dm, const Particle &p) const=0 |
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 |
Ptr< Amplitude >::pointer | amplitude () const |
![]() | |
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 |
![]() | |
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 |
![]() | |
string | fullName () const |
string | name () const |
string | path () const |
string | comment () const |
void | setup (istream &is) |
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 |
virtual IBPtr | fullclone () const |
void | persistentOutput (PersistentOStream &os) const |
void | persistentInput (PersistentIStream &is, int version) |
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 |
virtual IBPtr | fullclone () const |
![]() | |
void | debug () const |
virtual void | debugme () const |
![]() | |
CounterType | referenceCount () const |
![]() | |
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 |
Protected Member Functions | |
Clone Methods. | |
virtual IBPtr | clone () const |
Make a simple clone of this object. | |
virtual IBPtr | fullclone () const |
Make a clone of this object, possibly modifying the cloned object to make it sane. | |
![]() | |
ParticleVector | generate (bool inter, bool cc, const unsigned int &imode, const Particle &inpart) const |
Generate the momenta for the decay. | |
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. | |
DecayMEPtr | ME () const |
The helicity amplitude matrix element for spin correlations. | |
void | resetIntermediate (tcPDPtr part, Energy mass, Energy width) |
Reset the properities of all intermediates. | |
Energy | initializePhaseSpaceMode (unsigned int imode, bool init, bool onShell=false) const |
Initialize the phase-space mode. | |
void | generateIntermediates (bool in) |
Methods to set variables in inheriting classes. | |
bool | generateIntermediates () const |
Set whether or not the intermediates are included. | |
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. | |
unsigned int | numberModes () const |
Number of decay modes. | |
tPhaseSpaceModePtr | mode (unsigned int ix) |
Pointer to a mode. | |
tcPhaseSpaceModePtr | mode (unsigned int ix) const |
Pointer to a mode. | |
![]() | |
virtual void | dofinish () |
Finalize this object. | |
void | fixRho (RhoDMatrix &) const |
Set rho to be diagonal if no correlations. | |
![]() | |
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) |
![]() | |
virtual void | readSetup (istream &is) |
virtual void | doupdate () |
virtual void | doinit () |
virtual void | doinitrun () |
virtual void | dofinish () |
virtual IVector | getReferences () |
virtual void | rebind (const TranslationMap &) |
virtual IBPtr | clone () const=0 |
InterfacedBase (string newName) | |
InterfacedBase (const InterfacedBase &i) | |
virtual void | readSetup (istream &is) |
virtual void | doupdate () |
virtual void | doinit () |
virtual void | doinitrun () |
virtual void | dofinish () |
virtual IVector | getReferences () |
virtual void | rebind (const TranslationMap &) |
![]() | |
ReferenceCounted (const ReferenceCounted &) | |
ReferenceCounted & | operator= (const ReferenceCounted &) |
![]() | |
const Named & | operator= (const Named &other) |
const string & | name (const string &newName) |
Standard Interfaced functions. | |
vector< int > | incoming_ |
the PDG codes for the incoming particles | |
vector< pair< int, int > > | outgoing_ |
the PDG codes for the outgoing particles | |
vector< InvEnergy > | coupling_ |
the coupling for the decay | |
vector< double > | maxWeight_ |
the maximum weight for the decay | |
vector< Helicity::LorentzTensor< double > > | tensors_ |
Storage of polarization tensors to try and increase speed. | |
RhoDMatrix | rho_ |
Storage of the \(\rho\) matrix. | |
string | setUpDecayMode (string arg) |
Set the parameters for a decay mode. | |
virtual void | doinit () |
Initialize this object after the setup phase before saving and EventGenerator to disk. | |
virtual void | doinitrun () |
Initialize this object to the begining of the run phase. | |
TensorMeson2PScalarDecayer & | operator= (const TensorMeson2PScalarDecayer &)=delete |
Private and non-existent assignment operator. | |
Functions used by the persistent I/O system. | |
void | persistentOutput (PersistentOStream &os) const |
Function used to write out object persistently. | |
void | persistentInput (PersistentIStream &is, int version) |
Function used to read in object persistently. | |
static void | Init () |
Standard Init function used to initialize the interfaces. | |
Additional Inherited Members | |
![]() | |
enum | MEOption { Initialize , Calculate , Terminate } |
Enum for the matrix element option. More... | |
![]() | |
enum | POWHEGType { No , ISR , FSR , Both } |
Virtual members to be overridden by inheriting classes which implement hard corrections. More... | |
![]() | |
enum | InitState |
![]() | |
typedef unsigned int | CounterType |
![]() | |
static void | Init () |
The standard Init function used to initialize the interfaces. | |
![]() | |
static void | Init () |
The standard Init function used to initialize the interfaces. | |
![]() | |
static void | Init () |
static ParticleVector | DecayParticle (tPPtr parent, Step &step, long maxtry=1000) |
![]() | |
static void | Init () |
![]() | |
static void | Init () |
![]() | |
static void | Init () |
![]() | |
static void | Init () |
![]() | |
initializing | |
uninitialized | |
initialized | |
runready | |
![]() | |
const unsigned long | uniqueId |
![]() | |
static void | registerRepository (IBPtr) |
static void | registerRepository (IBPtr, string newName) |
The TensorMeson2PScalarDecayer
class is designed for the decay of a tensor meson to two pseudoscalars via matrix element which takes the form.
\[ \mathcal{M} = g \epsilon^{\mu\nu} p_{1,\mu}p_{2,\nu} \]
where \(\epsilon^{\mu\nu}\) is the polarization tensor of the decaying tensor meson, $p_{1,2}$ are the momenta of the decay products and \(g\) is the coupling.
It can also be used for the decay of a tensor to two scalar mesons although this rarely happens in practice.
The incoming tensor mesons together with their decay products and the coupling \(g\) can be specified using the interfaces for the class. The maximum weights for the decays can be calculated using the Initialize interface of the DecayIntegrator class or specified using the interface.
The incoming and outgoing particles, couplings and maximum weights for many of the common \(T\to PP\) decays are specified in the default constructor.
Definition at line 46 of file TensorMeson2PScalarDecayer.h.
|
inlineprotectedvirtual |
Make a simple clone of this object.
Implements ThePEG::InterfacedBase.
Definition at line 127 of file TensorMeson2PScalarDecayer.h.
|
virtual |
Construct the SpinInfos for the particles produced in the decay.
Implements Herwig::DecayIntegrator.
|
virtual |
Output the setup information for the particle database.
os | The stream to output the information to |
header | Whether or not to output the information for MySQL |
Reimplemented from Herwig::DecayIntegrator.
|
protectedvirtual |
Initialize this object after the setup phase before saving and EventGenerator to disk.
InitException | if object could not be initialized properly. |
Reimplemented from ThePEG::InterfacedBase.
|
protectedvirtual |
Initialize this object to the begining of the run phase.
Reimplemented from Herwig::DecayIntegrator.
|
inlineprotectedvirtual |
Make a clone of this object, possibly modifying the cloned object to make it sane.
Reimplemented from ThePEG::InterfacedBase.
Definition at line 133 of file TensorMeson2PScalarDecayer.h.
|
virtual |
Return the matrix element squared for a given mode and phase-space channel.
ichan | The channel we are calculating the matrix element for. |
part | The decaying Particle. |
outgoing | The particles produced in the decay |
momenta | The momenta of the particles produced in the decay |
meopt | Option for the calculation of the matrix element |
Implements Herwig::DecayIntegrator.
|
virtual |
Which of the possible decays is required.
cc | Is this mode the charge conjugate |
parent | The decaying particle |
children | The decay products |
Implements Herwig::DecayIntegrator.
void Herwig::TensorMeson2PScalarDecayer::persistentInput | ( | PersistentIStream & | is, |
int | version | ||
) |
Function used to read in object persistently.
is | the persistent input stream read from. |
version | the version number of the object when written. |
void Herwig::TensorMeson2PScalarDecayer::persistentOutput | ( | PersistentOStream & | os | ) | const |
Function used to write out object persistently.
os | the persistent output stream written to. |
|
virtual |
Specify the \(1\to2\) matrix element to be used in the running width calculation.
dm | The DecayMode |
mecode | The code for the matrix element as described in the GenericWidthGenerator class, in this case 7. |
coupling | The coupling for the matrix element. |
Reimplemented from Herwig::DecayIntegrator.
|
private |
the coupling for the decay
Definition at line 182 of file TensorMeson2PScalarDecayer.h.
|
private |
the PDG codes for the incoming particles
Definition at line 172 of file TensorMeson2PScalarDecayer.h.
|
private |
the maximum weight for the decay
Definition at line 187 of file TensorMeson2PScalarDecayer.h.
|
private |
the PDG codes for the outgoing particles
Definition at line 177 of file TensorMeson2PScalarDecayer.h.
|
mutableprivate |
Storage of the \(\rho\) matrix.
Definition at line 198 of file TensorMeson2PScalarDecayer.h.
|
mutableprivate |
Storage of polarization tensors to try and increase speed.
Definition at line 193 of file TensorMeson2PScalarDecayer.h.