alphaqcd.h

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//
// APFEL++ 2017
//
// Author: Valerio Bertone: valerio.bertone@cern.ch
//
 
#pragma once
 
#include "apfel/matchedevolution.h"
 
#include <functional>
 
namespace apfel
{
  class AlphaQCD: public MatchedEvolution<double>
  {
  public:
    AlphaQCD() = delete;
 
    AlphaQCD(double              const& AlphaRef,
             double              const& MuRef,
             std::vector<double> const& Masses,
             std::vector<double> const& Thresholds,
             int                 const& pt,
             int                 const& nsteps = 10);
 
    AlphaQCD(double              const& AlphaRef,
             double              const& MuRef,
             std::vector<double> const& Masses,
             int                 const& pt,
             int                 const& nsteps = 10);
 
    double MatchObject(bool const& Up, int const& nf, double const& Coup) const;
 
    double Derivative(int const& nf, double const&, double const& as) const;
 
    double betaQCD(int const& pt, int const& nf) const;
 
  private:
    int                                                           const _pt;                    
    std::function<double(bool const&, int const&, double const&)>       _MatchingConditions;    
    std::function<double(int const&, double const&)>                    _BetaFunction;          
  };
}