Speaker
Description
The $B^{0}\to K^{0}\pi^{0}$ decay is mediated by flavor-changing neutral currents, which are suppressed in the standard model (SM), and it provides an indirect route to search for beyond-the-SM particles. The decay is a key factor in improving the sensitivity of the $K$--$\pi$ isospin sum-rule. The first time-dependent analysis of the decay within Belle II is performed using a sample of $e^{+}e^{-}$ collisions corresponding to $189.8 fb^{-1}$ of integrated luminosity recorded at the $\Upsilon(4S)$ resonance. We measure the decay branching fraction $\mathcal{B}(B^{0} \to K^{0} \pi^{0}) = [11.0 \pm 1.2\, (stat.) \pm 1.0\, (syst.)] \times 10^{-6}$ and direct $CP$ violation asymmetry $A_{CP} (B^{0} \to K^{0} \pi^{0})= -0.41_{-0.32}^{+0.30}\, (stat.) \pm 0.09\, (syst.)$.
| Session | Quark and Lepton Flavour Physics |
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