energy_levels.hpp

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#pragma once

#include "parameters.hpp"

namespace QQbar_threshold{


  double ttbar_energy_level(
      int n, double mu, double m, order o,
      options opt = top_options()
  );


  double bbbar_energy_level(
      int n, double mu, double m, order o,
      options opt = bottom_options()
  );

  namespace detail{
    double QQbar_energy_level(int n, parameters const & p, double m_unshifted);

    double QQbar_energy_level_no_shift(int n, parameters const & p);

    double E_LO(int n, parameters const & p);

    // higher order corrections
    // E = E_LO * (1 + e1 + ... + e<order>)
    double e1(int n, parameters const & p);
    double e2(int n, parameters const & p);
    double e3(int n, parameters const & p);
    double e1_no_mass_shift(int n, parameters const & p);
    double e2_no_mass_shift(int n, parameters const & p);
    double e3_no_mass_shift(int n, parameters const & p);

    //charm integrand
    complex light_integrand_NNLO(complex const & u, parameters const & p);

  }
}