BELLE2-CONF-PH-2022-002

Measurements of the branching fraction and direct $\CP$-violating asymmetry in $\Bz \to \Kz \piz$ decays

S.~Hazra ; A.~B.~Basith ; G.~B.~Mohanty

02 March 2022

Abstract: We report the measurements of branching fraction ($\mathcal{B}$) and direct $\CP$-violating asymmetry ($\ACP$) in the charmless decays $\Bz\to K^0\pi^0$ at Belle~II. A sample of $\ep\en$ collisions, corresponding to $189.8\invfb$ of integrated luminosity, recorded near the $\Upsilon(4S)$ resonance is used for the study. We find $135$ signal candidates, and measure $\mathcal{B}(\Bz \to \Kz \piz) = [11.0 \pm 1.2 \stat \pm 1.0 \syst] \times 10^{-6}$ and $\ACP = -0.41_{-0.32}^{+0.30}\stat \pm 0.08\syst$.

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