Search for $B^0 \to K^{*0} \overline{K}{}^{*0}$, $B^0 \to K^{*0} K^{*0}$ and $B^0 \to K^+\pi^- K^{\mp}\pi^{\pm}$ Decays

We report a search for the decays $B^{0} \to K^{* 0} \overline{K}^{* 0}$ and $B^{0} \to K^{* 0} K^{* 0}$ . We also measure other charmless decay modes with $K^{+} π^{-} K^{-} π^{+}$ and $K^{+} π^{-} K^{+} π^{-}$ final states. The results are obtained from a data sample containing $657 \times 10^{6}$ $B \overline{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We set upper limits on the branching fractions for $B^0\to K^{*0} \kstarbar $a n d$ B^0\to K^{*0} K^{*0} $o f$ 0.81 \times 10^{-6} $a n d$ 0.20\times 10^{-6}$, respectively, at the 90% confidence level.

Search for $B^{0} \to K^{* 0} \overline{K}^{* 0}$ , $B^{0} \to K^{* 0} K^{* 0}$ and $B^{0} \to K^{+} π^{-} K^{\mp} π^{\pm}$ Decays

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Search for $B^{0} \to K^{* 0} \overline{K}^{* 0}$ , $B^{0} \to K^{* 0} K^{* 0}$ and $B^{0} \to K^{+} π^{-} K^{\mp} π^{\pm}$ Decays

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Search for B0→K∗0K‾∗0B0→K∗0K∗0, B0→K∗0K∗0B0→K∗0K∗0 and B0→K+π−K∓π±B0→K+π−K∓π± Decays

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Search for B0→K∗0K‾∗0B0→K∗0K∗0, B0→K∗0K∗0B0→K∗0K∗0 and B0→K+π−K∓π±B0→K+π−K∓π± Decays

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Search for $B^{0} \to K^{* 0} \overline{K}^{* 0}$ , $B^{0} \to K^{* 0} K^{* 0}$ and $B^{0} \to K^{+} π^{-} K^{\mp} π^{\pm}$ Decays

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Search for $B^{0} \to K^{* 0} \overline{K}^{* 0}$ , $B^{0} \to K^{* 0} K^{* 0}$ and $B^{0} \to K^{+} π^{-} K^{\mp} π^{\pm}$ Decays

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