The mass formulas obtained for pseudoscalar π ±,K±,K⁰(K̄⁰) mesons in the NLO approximation of combined expansion in momenta, quark masses m_q , and 1 1pt / 1pt N_c allow us to conclude that the ratios mᵤ 1pt / 1pt md and mₛ 1pt / 1pt md belong to a third-order algebraic curve. It is shown that the inclusion of higher-order corrections does not affect the shape of the curve. The data on the effective Lagrangian constants found from lattice calculations allow us to determine the quark masses.
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A. A. Osipov (2026) studied this question.
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