| Abstract |
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We describe searches for $B^0$ meson decays to the charmless final
states $\pi^0 K^0_SK^0_S$, $\eta K^0_S K^0_S$, and
$\eta^{\prime}K^0_SK^0_S$.
The data sample corresponds to $467 \times 10^{6}$ $B\bar{B}$ pairs
produced in $e^+e^-$ annihilation and collected with the
BABAR detector at the SLAC National Accelerator Laboratory.
We find no significant signals and determine the 90\% confidence
level upper limits on the branching fractions, in units of $10^{-7}$,
$\cal{B}(B^0 \ra \pi^0K^0_SK^0_S) <9 $,
$\cal{B}(B^0 \ra \eta K^0_SK^0_S) <10$,
and $\cal{B}(B^0 \ra \eta^{\prime}K^0_SK^0_S) <20$.
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