MEQG2QG.h

// -*- C++ -*-
//
// MEQG2QG.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2019 Leif Lonnblad
//
// ThePEG is licenced under version 3 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_MEQG2QG_H
#define ThePEG_MEQG2QG_H
// This is the declaration of the MEQG2QG class.

#include "ThePEG/MatrixElement/ME2to2QCD.h"

namespace ThePEG {

class MEQG2QG: 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 colA1() const 
  { 
    return ( interference()? 2.25: 2.0 )*sqr(uHat()/tHat()); 
  }

  double colB1() const 
  { 
    return ( interference()? 2.25: 2.0 )*sqr(sHat()/tHat());
  }

  double colA2() const { return  -uHat()/sHat(); }

  double colB2() const { return -sHat()/uHat(); }

public:

  static void Init();

protected:

  virtual IBPtr clone() const;

  virtual IBPtr fullclone() const;

private:

  static NoPIOClassDescription<MEQG2QG> initMEQG2QG;

  MEQG2QG & operator=(const MEQG2QG &) = delete;

};

}


namespace ThePEG {

template <>
struct BaseClassTrait<MEQG2QG,1>: public ClassTraitsType {
  typedef ME2to2QCD NthBase;
};

template <>
struct ClassTraits<MEQG2QG>: public ClassTraitsBase<MEQG2QG> {
  static string className() { return "ThePEG::MEQG2QG"; }
  static string library() { return "MEQCD.so"; }
};

}

#endif /* ThePEG_MEQG2QG_H */