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

This is the implementation of the four vector vertex. More...

#include <VVVVVertex.h>

Inheritance diagram for ThePEG::Helicity::VVVVVertex:
Inheritance graph
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List of all members.

Public Member Functions

virtual void setCoupling (Energy2 q2, tcPDPtr part1, tcPDPtr part2, tcPDPtr part3, tcPDPtr part4)=0
 Calculate the couplings.
Complex evaluate (Energy2 q2, int iopt, const VectorWaveFunction &vec1, const VectorWaveFunction &vec2, const VectorWaveFunction &vec3, const VectorWaveFunction &vec4)
 Members to calculate the helicity amplitude expressions for vertices and off-shell particles.
- Public Member Functions inherited from ThePEG::Helicity::AbstractVVVVVertex
 AbstractVVVVVertex ()
 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 setOrder (int id1, int id2, int id3, int id4)
 Set the order of the particles.
void setType (int itype)
 Set the type of the vertex.
void setIntermediate (tcPDPtr part1, tcPDPtr part2, Complex c1, Complex c2)
 Set the intermediate particles if including s/u/t channel terms.

Private Member Functions

VVVVVertexoperator= (const VVVVVertex &)
 Private and non-existent assignment operator.

Private Attributes

int _itype
 Type of vertex 1=QCD 2=EW.
int _iorder [4]
 Order of the particles.
tcPDPtr _inter [2]
 Intermediate particles.
Complex _coup [2]
 Couplings of the intermediate particles.

Static Private Attributes

static
AbstractNoPIOClassDescription
< VVVVVertex
initVVVVVertex
 Describe an abstract base class with persistent data.

Detailed Description

This is the implementation of the four vector vertex.

It is based on the AbstractVVVVVertex class for the storage of particles which are allowed to interact at the vertex. Classes implementation a specific vertex should inherit from this one and implement the virtual setCoupling member.

The form of the vertex is

\[ic^2\left[ 2\epsilon_1\cdot\epsilon_2\epsilon_3\cdot\epsilon_4- \epsilon_1\cdot\epsilon_3\epsilon_2\cdot\epsilon_4- \epsilon_1\cdot\epsilon_4\epsilon_2\cdot\epsilon_3 \right]\]

optional the additional diagrams from the three point vertices can be included.

See also:
AbstractVVVVVertex

Definition at line 39 of file VVVVVertex.h.


Member Function Documentation

Complex ThePEG::Helicity::VVVVVertex::evaluate ( Energy2  q2,
int  iopt,
const VectorWaveFunction vec1,
const VectorWaveFunction vec2,
const VectorWaveFunction vec3,
const VectorWaveFunction vec4 
)
virtual

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

Evaluate the vertex.

Parameters:
q2The scale $q^2$ for the coupling at the vertex.
ioptEvaluation option, 0 just evaluate the four point vertex, 1 include all the three point diagrams as well.
vec1The wavefunction for the first vector.
vec2The wavefunction for the second vector.
vec3The wavefunction for the third vector.
vec4The wavefunction for the fourth vector.

Implements ThePEG::Helicity::AbstractVVVVVertex.

virtual void ThePEG::Helicity::VVVVVertex::setCoupling ( Energy2  q2,
tcPDPtr  part1,
tcPDPtr  part2,
tcPDPtr  part3,
tcPDPtr  part4 
)
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.
part4The ParticleData pointer for the fourth particle.
void ThePEG::Helicity::VVVVVertex::setIntermediate ( tcPDPtr  part1,
tcPDPtr  part2,
Complex  c1,
Complex  c2 
)
inlineprotected

Set the intermediate particles if including s/u/t channel terms.

Parameters:
part1The ParticleData pointer for the first particle.
part2The ParticleData pointer for the second particle.
c1The coupling for the first particle.
c2The coupling for the second particle.

Definition at line 113 of file VVVVVertex.h.

References _coup, and _inter.

void ThePEG::Helicity::VVVVVertex::setOrder ( int  id1,
int  id2,
int  id3,
int  id4 
)
inlineprotected

Set the order of the particles.

Parameters:
id1The PDG code of the first particle.
id2The PDG code of the second particle.
id3The PDG code of the third particle.
id4The PDG code of the fourth particle.

Definition at line 91 of file VVVVVertex.h.

References _iorder.

void ThePEG::Helicity::VVVVVertex::setType ( int  itype)
inlineprotected

Set the type of the vertex.

Parameters:
itypeThe type of vertex (QCD=1 or electroweak=2).

Definition at line 102 of file VVVVVertex.h.

References _itype.


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