Search for the Rare Decays B+ --> D(*)+K0s

Abstract

We report on the search for the rare decays $B^{+}\to D^{(\ast )+}{K}_s^0$ in approximately 226 million $Y(4S)\to \mathrm{b}\bar{\mathrm{B}}$ 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, ${\ensuremath {{\cal B}(\Bp{\to}D^{+}K^0})}$ $<0.5\times 10^{-5}$ and ${\ensuremath {{\cal B}(\Bp{\to}D^{*+}K^0})}$ $<0.9\times 10^{-5}$.

8 pages, 3 postscript figures, submitted to Phys. Rev. D