ThePEG  1.8.0
Public Member Functions | Static Public Member Functions | Private Member Functions | Private Attributes | Static Private Attributes
ThePEG::Helicity::FFSVertex Class Reference

The FFSVertex class is the implementation of the interact of a scalar boson and a fermion-antifermion pair. More...

#include <FFSVertex.h>

Inheritance diagram for ThePEG::Helicity::FFSVertex:
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List of all members.

Public Member Functions

virtual void setCoupling (Energy2 q2, tcPDPtr part1, tcPDPtr part2, tcPDPtr part3)=0
 Calculate the couplings.
Complex evaluate (Energy2 q2, const SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, const ScalarWaveFunction &sca3)
 Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
SpinorWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const ScalarWaveFunction &sca3, complex< Energy > mass=-GeV, complex< Energy > width=-GeV)
 Evaluate the off-shell spinor coming from the vertex.
SpinorBarWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorBarWaveFunction &sbar2, const ScalarWaveFunction &sca3, complex< Energy > mass=-GeV, complex< Energy > width=-GeV)
 Evaluate the off-shell barred spinor coming from the vertex.
ScalarWaveFunction evaluate (Energy2 q2, int iopt, tcPDPtr out, const SpinorWaveFunction &sp1, const SpinorBarWaveFunction &sbar2, complex< Energy > mass=-GeV, complex< Energy > width=-GeV)
 Evaluate the off-shell scalar coming from the vertex.
Complex left ()
 Get the couplings.
Complex right ()
 Get the right coupling.
- Public Member Functions inherited from ThePEG::Helicity::AbstractFFSVertex
 AbstractFFSVertex ()
 Default constructor.
- Public Member Functions inherited from ThePEG::Helicity::VertexBase
 VertexBase (VertexType::T name, bool kine=false)
 Constructor for $n$-point vertices.
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.
unsigned int size () const
 Access to the particle information.
bool isIncoming (tPDPtr p) const
 Is a particle allowed as an incoming particle?
bool isOutgoing (tPDPtr p) const
 Is a particle allowed as an outgoing particle?
const set< tPDPtr > & incoming () const
 Get the list of incoming particles.
const set< tPDPtr > & outgoing () const
 Get the list of outgoing particles.
Complex norm () const
 Get the coupling.
vector< long > search (unsigned int ilist, long id) const
 Function to search the list.
vector< tPDPtrsearch (unsigned int ilist, tcPDPtr id) const
 Function to search the list.
bool allowed (long id1, long id2, long id3, long id4=0) const
 Is a given combination allowed.
VertexType::T getName () const
 Get name of Vertex.
unsigned int getNpoint () const
 Get number of lines on Vertex.
unsigned int orderInGem () const
 Get the order in $g_EM$.
unsigned int orderInGs () const
 Get the order in $g_s$.
double strongCoupling (Energy2 q2) const
 Strong coupling.
double electroMagneticCoupling (Energy2 q2) const
 Electromagnetic coupling.
double weakCoupling (Energy2 q2) const
 Weak coupling.
double sin2ThetaW () const
bool kinematics () const
 Whether or not to calculate the kinematics invariants.
void kinematics (bool kine)
 Set whether or not to calculate the kinematics invariants.
void calculateKinematics (const Lorentz5Momentum &p0, const Lorentz5Momentum &p1, const Lorentz5Momentum &p2)
 Calculate the kinematics for a 3-point vertex.
void calculateKinematics (const Lorentz5Momentum &p0, const Lorentz5Momentum &p1, const Lorentz5Momentum &p2, const Lorentz5Momentum &p3)
 Calculate the kinematics for a 4-point vertex.
void calculateKinematics (const vector< Lorentz5Momentum > &p)
 Calculate the kinematics for a n-point vertex.
Energy2 invariant (unsigned int ix, unsigned int iy) const
 Get one of the kinematic invariants.
- Public Member Functions inherited from ThePEG::Interfaced
virtual ~Interfaced ()
 Empty virtual destructor.
virtual bool defaultInit ()
 Functions which are to be used during the actual event generation, after the setup is complete.
PPtr getParticle (PID) const
 Create a new Particle instance given a id number.
PDPtr getParticleData (PID) const
 Return a pointer to the ParticleData object corresponding to the given id number.
bool used () const
 Returns true if this object has actally been used.
void useMe () const
 Should be called to indicate that this object has actually been used.
tEGPtr generator () const
 Return a pointer to the EventGenerator controlling the run.
- Public Member Functions inherited from ThePEG::InterfacedBase
virtual ~InterfacedBase ()
 The virtual (empty) destructor;.
string fullName () const
 Returns the full name of this object including its path, e.g.
string name () const
 Returns the name of this object, without the path.
string path () const
 Returns the path to this object including the trailing '/'.
string comment () const
 Returns a comment assigned to this object.
void setup (istream &is)
 Read setup info from a standard istream is.
virtual IBPtr fullclone () const
 Return a full clone of this object possibly doing things to the clone to make it sane.
virtual void debugme () const
 Print out debugging information for this object on std::cerr.
void update ()
 Calls the doupdate() function with recursion prevention.
void init ()
 Calls the doinit() function with recursion prevention.
virtual bool preInitialize () const
 Return true if this object needs to be initialized before all other objects (except those for which this function also returns true).
void initrun ()
 Calls the doinitrun() function with recursion prevention.
void finish ()
 Calls the dofinish() function with recursion prevention.
void touch ()
 This function should be called every time something in this object has changed in a way that a sanity check with update() is needed.
void reset ()
 Set the state of this object to uninitialized.
void clear ()
 Calls reset() and unTouch().
InitState state () const
 Return the state of initialization of this object.
bool locked () const
 Return true if the BaseRepository is not allowed to change the state of this object.
bool touched () const
 Return true if the state of this object has been changed since the last call to update().
- Public Member Functions inherited from ThePEG::Base
virtual ~Base ()
 The virtual destructor.
void debug () const
 Print out debugging information for this object on std::cerr.
- Public Member Functions inherited from ThePEG::Pointer::ReferenceCounted
CounterType referenceCount () const
 Return the reference count.
- Public Member Functions inherited from ThePEG::Named
 Named (const string &newName=string())
 Constructor with name.
bool operator== (const Named &other) const
 Test for equality.
bool operator< (const Named &other) const
 Lexicographical comparison.

Static Public Member Functions

static void Init ()
 Standard Init function used to initialize the interfaces.

Protected Member Functions

void left (Complex in)
 Set the couplings.
void right (Complex in)
 Set the right coupling.

Private Member Functions

FFSVertexoperator= (const FFSVertex &)
 Private and non-existent assignment operator.

Private Attributes

Complex _left
 Storage of the left coupling.
Complex _right
 Storage of the right coupling.

Static Private Attributes

static
AbstractNoPIOClassDescription
< FFSVertex
initFFSVertex
 Describe an abstract base class with persistent data.

Detailed Description

The FFSVertex class is the implementation of the interact of a scalar boson and a fermion-antifermion pair.

It inherits from the AbstractFFSVertex class for storage of the particles interacting at the vertex and implements the helicity calculations.

Implementations of specific interactions should inherit from this and implement the virtual setCoupling member.

The form of the vertex is

\[ic\bar{f_2}a^\lambda P_\lambda f_1\phi_3\]

where $a^\pm$ are the right and left couplings and $P_\pm=(1\pm\gamma_5)$ are the chirality projection operators.

See also:
AbstractFFSVertex

Definition at line 41 of file FFSVertex.h.


Member Function Documentation

Complex ThePEG::Helicity::FFSVertex::evaluate ( Energy2  q2,
const SpinorWaveFunction sp1,
const SpinorBarWaveFunction sbar2,
const ScalarWaveFunction sca3 
)
virtual

Members to calculate the helicity amplitude expressions for vertices and off-shell particles.

Evalulate the vertex.

Parameters:
q2The scale $q^2$ for the coupling at the vertex.
sp1The wavefunction for the ferimon.
sbar2The wavefunction for the antifermion.
sca3The wavefunction for the scalar.

Implements ThePEG::Helicity::AbstractFFSVertex.

SpinorWaveFunction ThePEG::Helicity::FFSVertex::evaluate ( Energy2  q2,
int  iopt,
tcPDPtr  out,
const SpinorWaveFunction sp1,
const ScalarWaveFunction sca3,
complex< Energy mass = -GeV,
complex< Energy width = -GeV 
)
virtual

Evaluate the off-shell spinor coming from the vertex.

Parameters:
q2The scale $q^2$ for the coupling at the vertex.
ioptOption of the shape of the Breit-Wigner for the off-shell spinor.
outThe ParticleData pointer for the off-shell spinor.
sp1The wavefunction for the ferimon.
sca3The wavefunction for the scalar.
massThe mass of the off-shell particle if not taken from the ParticleData object
widthThe width of the off-shell particle if not taken from the ParticleData object

Implements ThePEG::Helicity::AbstractFFSVertex.

SpinorBarWaveFunction ThePEG::Helicity::FFSVertex::evaluate ( Energy2  q2,
int  iopt,
tcPDPtr  out,
const SpinorBarWaveFunction sbar2,
const ScalarWaveFunction sca3,
complex< Energy mass = -GeV,
complex< Energy width = -GeV 
)
virtual

Evaluate the off-shell barred spinor coming from the vertex.

Parameters:
q2The scale $q^2$ for the coupling at the vertex.
ioptOption of the shape of the Breit-Wigner for the off-shell barred spinor.
outThe ParticleData pointer for the off-shell barred spinor.
sbar2The wavefunction for the antifermion.
sca3The wavefunction for the scalar.
massThe mass of the off-shell particle if not taken from the ParticleData object
widthThe width of the off-shell particle if not taken from the ParticleData object

Implements ThePEG::Helicity::AbstractFFSVertex.

ScalarWaveFunction ThePEG::Helicity::FFSVertex::evaluate ( Energy2  q2,
int  iopt,
tcPDPtr  out,
const SpinorWaveFunction sp1,
const SpinorBarWaveFunction sbar2,
complex< Energy mass = -GeV,
complex< Energy width = -GeV 
)
virtual

Evaluate the off-shell scalar coming from the vertex.

Parameters:
q2The scale $q^2$ for the coupling at the vertex.
ioptOption of the shape of the Breit-Wigner for the off-shell scalar.
outThe ParticleData pointer for the off-shell scalar.
sp1The wavefunction for the ferimon.
sbar2The wavefunction for the antifermion.
massThe mass of the off-shell particle if not taken from the ParticleData object
widthThe width of the off-shell particle if not taken from the ParticleData object

Implements ThePEG::Helicity::AbstractFFSVertex.

Complex ThePEG::Helicity::FFSVertex::left ( )
inline

Get the couplings.

Get the left coupling.

Definition at line 138 of file FFSVertex.h.

References _left.

void ThePEG::Helicity::FFSVertex::left ( Complex  in)
inlineprotected

Set the couplings.

Set the left coupling.

Definition at line 155 of file FFSVertex.h.

References _left.

virtual void ThePEG::Helicity::FFSVertex::setCoupling ( Energy2  q2,
tcPDPtr  part1,
tcPDPtr  part2,
tcPDPtr  part3 
)
pure virtual

Calculate the couplings.

This method is virtual and must be implemented in classes inheriting from this.

Parameters:
q2The scale $q^2$ for the coupling at the vertex.
part1The ParticleData pointer for the first particle.
part2The ParticleData pointer for the second particle.
part3The ParticleData pointer for the third particle.

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