Contribution of Sigma Meson Pole to K_L-K_S mass Difference(§5. Low Energy Hadron Phenomenology and Chiral Symmetry,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)

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The hypothesis of σ meson pole dominance in the |ΔI| = 1/2 K → ππ amplitudes is tested qualitatively by using the K_L-K_S mass difference.