$η-η^\prime$ Mixing in the Flavor Basis and Large N

The mass matrix for $η-η^\prime$ is derived in the flavor basis at ${\cal O}(p^4)$ of the chiral Lagrangian using the large $N$ approximation. Under certain assumptions, the mixing angle $ϕ=41.4^\circ$ and the decay constants ratio $f_K/f_π=1.15$ are calculated in agreement with the data. It appears that the FKS scheme arises as a special limit of the chiral Lagrangian. Their mass matrix is obtained without the hypothesis on the mixing pattern of the decay constants.

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