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We report the measurement of the branching fraction of the $B^0 \to K_S^0\pi^0 \gamma$ decay in $e^+ e^- \to \Upsilon(4S) \to B \overline{B}$ datarecorded by the Belle II experiment at the SuperKEKB asymmetric-energy colliderand corresponding to 190 fb$^{-1}$ of integrated luminosity. The signal yieldis measured to be $121\pm 29\,\hbox{(stat.)}$, leading to the branchingfraction ${\cal B}\left(B^0 \to K_S^0 \pi^0 \gamma\right) = \left(7.3 \pm1.8\,\hbox{(stat.)} \pm 1.0\,\hbox{(syst.)} \right)\times 10^{-6}$, whichagrees with the known value.

Measurement of the branching fraction of the $B^0 \to K_S^0 \pi^0 \gamma$ decay using 190 fb$^{-1}$ of Belle II data