In large-Nc chiral perturbation theory, the decay constant depends on a single correlated combination of F0, L4, and C16, so phenomenological fits constrain directions rather than independent low-energy constants.
Approximating chiral SU(3) ampli- tudes,
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Correlated low-energy constants in large-$N_c$ chiral perturbation theory
In large-Nc chiral perturbation theory, the decay constant depends on a single correlated combination of F0, L4, and C16, so phenomenological fits constrain directions rather than independent low-energy constants.