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MEMinBias.h
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// -*- C++ -*-
#ifndef HERWIG_MEMinBias_H
#define HERWIG_MEMinBias_H
//
// This is the declaration of the MEMinBias class.
//
#include "ThePEG/MatrixElement/MEBase.h"
namespace Herwig {
using namespace ThePEG;
/**
* The MEMinBias class provides a simple colour singlet exchange matrix element
* to be used in the soft component of the multiple scattering model of the
* underlying event
*
* @see \ref MEMinBiasInterfaces "The interfaces"
* defined for MEMinBias.
*/
class MEMinBias: public MEBase {
public:
/** @name Virtual functions required by the MEBase class. */
//@{
/**
* Return the order in \f$\alpha_S\f$ in which this matrix
* element is given.
*/
virtual unsigned int orderInAlphaS() const;
/**
* Return the order in \f$\alpha_{EW}\f$ in which this matrix
* element is given.
*/
virtual unsigned int orderInAlphaEW() const;
/**
* The matrix element for the kinematical configuration
* previously provided by the last call to setKinematics(), suitably
* scaled by sHat() to give a dimension-less number.
* @return the matrix element scaled with sHat() to give a
* dimensionless number.
*/
virtual double me2() const;
/**
* Return the scale associated with the last set phase space point.
*/
virtual Energy2 scale() const;
/**
* Set the typed and momenta of the incoming and outgoing partons to
* be used in subsequent calls to me() and colourGeometries()
* according to the associated XComb object. If the function is
* overridden in a sub class the new function must call the base
* class one first.
*/
virtual void setKinematics();
/**
* The number of internal degrees of freedom used in the matrix
* element.
*/
virtual int nDim() const;
/**
* Generate internal degrees of freedom given nDim() uniform
* random numbers in the interval \f$ ]0,1[ \f$. To help the phase space
* generator, the dSigHatDR should be a smooth function of these
* numbers, although this is not strictly necessary.
* @param r a pointer to the first of nDim() consecutive random numbers.
* @return true if the generation succeeded, otherwise false.
*/
virtual bool generateKinematics(const double * r);
/**
* Return the matrix element squared differential in the variables
* given by the last call to generateKinematics().
*/
virtual CrossSection dSigHatDR() const;
/**
* Add all possible diagrams with the add() function.
*/
virtual void getDiagrams() const;
/**
* Get diagram selector. With the information previously supplied with the
* setKinematics method, a derived class may optionally
* override this method to weight the given diagrams with their
* (although certainly not physical) relative probabilities.
* @param dv the diagrams to be weighted.
* @return a Selector relating the given diagrams to their weights.
*/
virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) const;
/**
* Return a Selector with possible colour geometries for the selected
* diagram weighted by their relative probabilities.
* @param diag the diagram chosen.
* @return the possible colour geometries weighted by their
* relative probabilities.
*/
virtual Selector<const ColourLines *>
colourGeometries(tcDiagPtr diag) const;
//@}
public:
/**
* The standard Init function used to initialize the interfaces.
* Called exactly once for each class by the class description system
* before the main function starts or
* when this class is dynamically loaded.
*/
static void Init();
protected:
/** @name Clone Methods. */
//@{
/**
* Make a simple clone of this object.
* @return a pointer to the new object.
*/
virtual IBPtr clone() const;
/** Make a clone of this object, possibly modifying the cloned object
* to make it sane.
* @return a pointer to the new object.
*/
virtual IBPtr fullclone() const;
//@}
// If needed, insert declarations of virtual function defined in the
// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).
private:
/**
* The static object used to initialize the description of this class.
* Indicates that this is a concrete class with persistent data.
*/
static ClassDescription<MEMinBias> initMEMinBias;
/**
* The assignment operator is private and must never be called.
* In fact, it should not even be implemented.
*/
MEMinBias & operator=(const MEMinBias &);
};
}
#include "ThePEG/Utilities/ClassTraits.h"
namespace ThePEG {
/** @cond TRAITSPECIALIZATIONS */
/** This template specialization informs ThePEG about the
* base classes of MEMinBias. */
template <>
struct BaseClassTrait<Herwig::MEMinBias,1> {
/** Typedef of the first base class of MEMinBias. */
typedef MEBase NthBase;
};
/** This template specialization informs ThePEG about the name of
* the MEMinBias class and the shared object where it is defined. */
template <>
struct ClassTraits<Herwig::MEMinBias>
: public ClassTraitsBase<Herwig::MEMinBias> {
/** Return a platform-independent class name */
static string className() { return "Herwig::MEMinBias"; }
/**
* The name of a file containing the dynamic library where the class
* MEMinBias is implemented. It may also include several, space-separated,
* libraries if the class MEMinBias depends on other classes (base classes
* excepted). In this case the listed libraries will be dynamically
* linked in the order they are specified.
*/
static string library() {return "HwMEHadron.so";}
};
/** @endcond */
}
#endif /* HERWIG_MEMinBias_H */

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