MEqq2qq1.h

// -*- C++ -*-
//
// MEqq2qq1.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_MEqq2qq_H
#define ThePEG_MEqq2qq_H
// This is the declaration of the MEqq2qq class.

#include "ThePEG/MatrixElement/ME2to2QCD.h"

namespace ThePEG {

class MEqq2qq: 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 (sqr(tHat()) + sqr(uHat()))/sqr(sHat()) +
      (interference()? -double(sqr(uHat())/(3.0*sHat()*tHat())): 0.0);
  }

  double colB() const
  {
    return (sqr(uHat()) + sqr(sHat()))/sqr(tHat()) +
      (interference()? -double(sqr(uHat())/(3.0*sHat()*tHat())): 0.0);
  }

public:

  static void Init();

protected:

  virtual IBPtr clone() const;

  virtual IBPtr fullclone() const;

private:

  static NoPIOClassDescription<MEqq2qq> initMEqq2qq;

  MEqq2qq & operator=(const MEqq2qq &) = delete;

};

}


namespace ThePEG {

template <>
struct BaseClassTrait<MEqq2qq,1>: public ClassTraitsType {
  typedef ME2to2QCD NthBase;
};

template <>
struct ClassTraits<MEqq2qq>: public ClassTraitsBase<MEqq2qq> {
  static string className() { return "ThePEG::MEqq2qq"; }
  static string library() { return "MEQCD.so"; }
};

}

#endif /* ThePEG_MEqq2qq_H */