alphaqcdxi.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 AlphaQCDxi: public MatchedEvolution<double>
  {
  public:
    AlphaQCDxi() = delete;
 
    AlphaQCDxi(double              const& AlphaRef,
               double              const& MuRef,
               std::vector<double> const& Masses,
               std::vector<double> const& Thresholds,
               int                 const& pt,
               double              const& xi = 1,
               int                 const& nsteps = 10);
 
    AlphaQCDxi(double              const& AlphaRef,
               double              const& MuRef,
               std::vector<double> const& Masses,
               int                 const& pt,
               double              const& xi = 1,
               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, double const& lambda) const;
 
  private:
    int                                                           const _pt;                    
    double                                                        const _xi;                    
    std::function<double(bool const&, int const&, double const&)>       _MatchingConditions;    
    std::function<double(int const&, double const&)>                    _BetaFunction;          
  };
}