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We use $B^0 \\to K^0_S \\pi^0$ decays for both mixing-induced and direct $CP$ violating asymmetry measurements and $B^0 \\to K^0_L \\pi^0$ decays for the direct CP violation measurement. The CP violation parameters obtained are $\\sin 2 \\phi_1^{\\rm eff} = +0.67 \\pm 0.31{(stat)} \\pm 0.08 {(syst)}$ and $\\mathcal{A}_{K^0 \\pi^0} = +0.14 \\pm 0.13{(stat)} \\pm 0.06 {(syst)}$. 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Fujikawa, Y.Yusa (for the Belle Collaboration)","submitted_at":"2008-09-25T10:29:31Z","abstract_excerpt":"We report measurements of CP violation parameters in $B^0 \\to K^0 \\pi^0$ decays based on a data sample of $657 \\times 10^6 B\\bar{B}$ pairs collected with the Belle detector at the KEKB $e^+ e^-$ asymmetric-energy collider. We use $B^0 \\to K^0_S \\pi^0$ decays for both mixing-induced and direct $CP$ violating asymmetry measurements and $B^0 \\to K^0_L \\pi^0$ decays for the direct CP violation measurement. The CP violation parameters obtained are $\\sin 2 \\phi_1^{\\rm eff} = +0.67 \\pm 0.31{(stat)} \\pm 0.08 {(syst)}$ and $\\mathcal{A}_{K^0 \\pi^0} = +0.14 \\pm 0.13{(stat)} \\pm 0.06 {(syst)}$. 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