RunningCoupling.h

// -*- C++ -*-
//
// RunningCoupling.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad, (C) 2009 Simon Platzer
//
// 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_RunningCoupling_H
#define ThePEG_RunningCoupling_H
// This is the declaration of the RunningCoupling class.

#include "ThePEG/Interface/Interfaced.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "StandardModelBase.fh"

namespace ThePEG {

class RunningCoupling: public Interfaced {

public:

  RunningCoupling () : theScaleFactor(1.) {}


  virtual double value (Energy2 scale, const StandardModelBase & sm) const = 0;

  virtual unsigned int nloops () const { return 0; }


  double value(Energy2 scale) const {
    return value(scale,*(generator()->standardModel()));
  }

  virtual double overestimateValue (Energy2 scale) const {
    return value(scale);
  }

  virtual double ratioToOverestimate (Energy2) const {
    return 1.;
  }

  double scaleFactor () const { return theScaleFactor; }

public:

  void persistentOutput(PersistentOStream & os) const;

  void persistentInput(PersistentIStream & is, int version);

  static void Init();

private:

  static AbstractClassDescription<RunningCoupling> initRunningCoupling;

  RunningCoupling & operator=(const RunningCoupling &);

  double theScaleFactor;

};

template <>
struct BaseClassTrait<RunningCoupling,1>: public ClassTraitsType {
  typedef Interfaced NthBase;
};

template <>
struct ClassTraits<RunningCoupling>: public ClassTraitsBase<RunningCoupling> {
  static string className() { return "ThePEG::RunningCoupling"; }
};

}

#endif /* ThePEG_RunningCoupling_H */

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