Search for the decay $B^{+}\to \bar{K}{}^{\ast 0}{K}^{\ast +}$ at Belle

We report a search for the rare charmless decay $B^{+}\to \bar{K}{}^{\ast 0}{K}^{\ast +}$ using a data sample of $772\times {10}^6$ $B\bar{B}$ pairs collected at the $\mathrm{{\rm Y}}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. No statistically significant signal is found and a 90% confidence-level upper limit is set on the decay branching fraction as $\mathcal{B}(B^{+}\to \bar{K}{}^{\ast 0}{K}^{\ast +})<1.31\times {10}^{-6}$.