Search for the rare decaysB+→D(*)+KS0

Abstract

We report on the search for the rare decays $B^{+}\to D^{(*)+}{K}_S^0$ in approximately $226\times {10}^6$ ${\rm Y}(4S)\to B\overline{B}$ decays collected with the BABAR detector at the PEP-II asymmetric-energy $B$ factory at SLAC. We do not observe any significant signal and we set 90% confidence-level upper limits on the branching fractions, $\mathcal{B}(B^{+}\to D^{+}{K}^0)<0.5\times {10}^{-5}$ and $\mathcal{B}(B^{+}\to D^{*+}{K}^0)<0.9\times {10}^{-5}$.