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SSTVertex.h
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// -*- C++ -*-
#ifndef HERWIG_SSTVertex_H
#define HERWIG_SSTVertex_H
//
// This is the declaration of the SSTVertex class.
//
#include "Herwig++/Helicity/Vertex/VertexBase.h"
#include "Herwig++/Helicity/WaveFunction/ScalarWaveFunction.h"
#include "Herwig++/Helicity/WaveFunction/TensorWaveFunction.h"
#include "SSTVertex.fh"
namespace Herwig {
namespace Helicity {
using namespace ThePEG;
/** \ingroup Helicity
*
* The VVTVertexclass is the implementation of the
* scalar-scalar-tensor vertex.
* It inherits from the VertexBase class for the storage of the particles
* interacting at the vertex and implements the helicity amplitude calculations.
*
* All implementations of this vertex should inherit from it and implement the
* virtual setCoupling member.
*
* The form of the vertex is
* \f[
* -\frac{i\kappa}2\left[m^2_Sg_{\mu\nu}-k_{1\mu}k_{2\nu}-k_{1\nu}k_{2\mu}
* +g_{\mu\nu}k_1\cdot k_2\right]\epsilon^{\mu\nu}_3\phi_1\phi_2
*
* \f]
*
* @see VertexBase
*/
class SSTVertex: public VertexBase {
public:
/** @name Standard constructors and destructors. */
//@{
/**
* Default constructor.
*/
inline SSTVertex();
/**
* Copy-constructor.
*/
inline SSTVertex(const SSTVertex &);
/**
* Destructor.
*/
virtual ~SSTVertex();
//@}
public:
/** @name Functions used by the persistent I/O system. */
//@{
/**
* Function used to write out object persistently.
* @param os the persistent output stream written to.
*/
void persistentOutput(PersistentOStream & os) const;
/**
* Function used to read in object persistently.
* @param is the persistent input stream read from.
* @param version the version number of the object when written.
*/
void persistentInput(PersistentIStream & is, int version);
//@}
/**
* Standard Init function used to initialize the interfaces.
*/
static void Init();
public:
/**
* Members to calculate the helicity amplitude expressions for vertices
* and off-shell particles.
*/
//@{
/**
* Evalulate the vertex.
* @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
* @param sca1 The wavefunction for the first scalar.
* @param sca2 The wavefunction for the second scalar
* @param ten3 The wavefunction for the tensor.
*/
Complex evaluate(Energy2 q2, const ScalarWaveFunction & sca1,
const ScalarWaveFunction & sca2, const TensorWaveFunction & ten3);
/**
* Evaluate the off-shell scalar coming from the vertex.
* @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
* @param iopt Option of the shape of the Breit-Wigner for the off-shell scalar.
* @param out The ParticleData pointer for the off-shell scalar.
* @param sca1 The wavefunction for the first scalar.
* @param ten3 The wavefunction for the tensor.
*/
ScalarWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
const ScalarWaveFunction & sca1,
const TensorWaveFunction & ten3);
/**
* Evaluate the off-shell tensor coming from the vertex.
* @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
* @param iopt Option of the shape of the Breit-Wigner for the off-shell tensor.
* @param out The ParticleData pointer for the off-shell tensor.
* @param sca1 The wavefunction for the first scalar.
* @param sca2 The wavefunction for the second scalar.
*/
TensorWaveFunction evaluate(Energy2 q2,int iopt,tcPDPtr out,
const ScalarWaveFunction & sca1,
const ScalarWaveFunction & sca2);
//@}
/**
* Calculate the couplings. This method is virtual and must be implemented in
* classes inheriting from this.
* @param q2 The scale \f$q^2\f$ for the coupling at the vertex.
* @param part1 The ParticleData pointer for the first particle.
* @param part2 The ParticleData pointer for the second particle.
* @param part3 The ParticleData pointer for the third particle.
*/
virtual void setCoupling(Energy2 q2,tcPDPtr part1,tcPDPtr part2,tcPDPtr part3)=0;
protected:
/** @name Standard Interfaced functions. */
//@{
/**
* Check sanity of the object during the setup phase.
*/
inline virtual void doupdate() throw(UpdateException);
/**
* Initialize this object after the setup phase before saving and
* EventGenerator to disk.
* @throws InitException if object could not be initialized properly.
*/
inline virtual void doinit() throw(InitException);
/**
* Initialize this object to the begining of the run phase.
*/
inline virtual void doinitrun();
/**
* Finalize this object. Called in the run phase just after a
* run has ended. Used eg. to write out statistics.
*/
inline virtual void dofinish();
/**
* Rebind pointer to other Interfaced objects. Called in the setup phase
* after all objects used in an EventGenerator has been cloned so that
* the pointers will refer to the cloned objects afterwards.
* @param trans a TranslationMap relating the original objects to
* their respective clones.
* @throws RebindException if no cloned object was found for a given pointer.
*/
inline virtual void rebind(const TranslationMap & trans)
throw(RebindException);
/**
* Return a vector of all pointers to Interfaced objects used in
* this object.
* @return a vector of pointers.
*/
inline virtual IVector getReferences();
//@}
private:
/**
* Describe an abstract class with persistent data.
*/
static AbstractClassDescription<SSTVertex> initSSTVertex;
/**
* Private and non-existent assignment operator.
*/
SSTVertex & operator=(const SSTVertex &);
};
}
}
#include "SSTVertex.icc"
namespace ThePEG {
/**
* The following template specialization informs ThePEG about the
* base class of SSTVertex.
*/
template <>
struct BaseClassTrait<Herwig::Helicity::SSTVertex,1> {
/** Typedef of the base class of SSTVertex. */
typedef Herwig::Helicity::VertexBase NthBase;
};
/**
* The following template specialization informs ThePEG about the
* name of this class and the shared object where it is defined.
*/
template <>
struct ClassTraits<Herwig::Helicity::SSTVertex>
: public ClassTraitsBase<Herwig::Helicity::SSTVertex> {
/**
* Return the class name.
*/
static string className() { return "Herwig++::Helicity::SSTVertex"; }
/**
* Return the name of the shared library to be loaded to get
* access to this class and every other class it uses
* (except the base class).
*/
static string library() { return "HwTVertex.so"; }
};
}
#endif /* HERWIG_SSTVertex_H */

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