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

Abstract

We report a search for the decays $B^0\to K^{\ast 0}\overline{K}{}^{\ast 0}$ and $B^0\to K^{\ast 0}{K}^{\ast 0}$. We also measure other charmless decay modes with $K^{+}{\pi }^{-}{K}^{-}{\pi }^{+}$ and $K^{+}{\pi }^{-}{K}^{+}{\pi }^{-}$ 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 $B^0\to K^{*0} \kstarbar$ and $B^0\to K^{\ast 0}{K}^{\ast 0}$ of $0.81\times 10^{-6}$ and $0.20\times 10^{-6}$, respectively, at the 90% confidence level.

7 pages, 2 figures. submitted to PRD(R)

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