MEQQ2GG.h

// -*- C++ -*-
//
// MEQQ2GG.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_MEQQ2GG_H
#define ThePEG_MEQQ2GG_H
// This is the declaration of the MEQQ2GG class.

#include "ThePEG/MatrixElement/ME2to2QCD.h"

namespace ThePEG {

class MEQQ2GG: public ME2to2QCD {

public:

  virtual double me2() const;

  virtual void getDiagrams() const;

  virtual Selector<const ColourLines *>
  colourGeometries(tcDiagPtr diag) const;

  virtual Selector<DiagramIndex> diagrams(const DiagramVector & dv) const;

protected:

  double colA() const 
  {
    return uHat()/tHat() - 2.0*sqr(uHat()/sHat());
  }


  double colB() const
  {
    return tHat()/uHat() - 2.0*sqr(tHat()/sHat());
  }


public:

  static void Init();

protected:

  virtual IBPtr clone() const;

  virtual IBPtr fullclone() const;

private:

  static NoPIOClassDescription<MEQQ2GG> initMEQQ2GG;

  MEQQ2GG & operator=(const MEQQ2GG &);

};

}


namespace ThePEG {

template <>
struct BaseClassTrait<MEQQ2GG,1>: public ClassTraitsType {
  typedef ME2to2QCD NthBase;
};

template <>
struct ClassTraits<MEQQ2GG>: public ClassTraitsBase<MEQQ2GG> {
  static string className() { return "ThePEG::MEQQ2GG"; }
  static string library() { return "MEQCD.so"; }
};

}

#endif /* ThePEG_MEQQ2GG_H */

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