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We present a measurement of the time-dependent $CP$ violation parameters in$B^0\to\eta'K^0$ decays. The measurement is based on the full data samplecontaining $772\times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$resonance using the Belle detector at the KEKB asymmetric-energy $e^+e^-$collider. The measured values of the mixing-induced and direct $CP$ violationparameters are: \begin{align} \sin 2 \phi^{\rm eff}_1 &= +0.68\pm 0.07 \pm0.03, \nonumber \\ \mathcal{A}_{\eta'K^0} &= +0.03\pm 0.05\pm 0.04, \nonumber\end{align} where the first uncertainty is statistical and the second issystematic. The values obtained are the most accurate to date. Furthermore,these results are consistent with our previous measurements and with theworld-average value of $\sin 2\phi_1$ measured in $B^0\to J/\psi K^0$ decays.}

Measurement of Time-Dependent $CP$ Violation in $B^0\to \eta'K^0$ Decays