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2008

Measurement of CP asymmetries in $B^0 \to K^0\pi^0$ decays

Fujikawa, M., Yusa, Y.

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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 $\mathcal{A}_{K^0 \pi^0} = +0.14 \pm 0.13{(stat)} \pm 0.06 {(syst)}$.
The branching fraction of $B^0 \to K^0 \pi^0$ decay is measured to be $\mathcal{B}(B^0 \to K^0 \pi^0) = (8.7\pm0.5 (\rm{stat.})\pm0.6 (\rm{syst.}))\times 10^{-6}$.

Measurement of CP asymmetries in $B^0 \to K^0\pi^0$ decays · Around

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