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

TL;DR

This study searches for rare B+ meson decays into D(*)+ and K0s particles using a large dataset, but finds no significant signals and sets upper limits on their branching fractions.

Contribution

First search for the rare decays B+ → D(*)+ K0s, providing upper limits on their branching fractions based on extensive data analysis.

Findings

No significant signals observed for the decays.

Upper limits set on branching fractions: <0.5×10⁻⁵ and <0.9×10⁻⁵.

Results constrain theoretical models of rare B+ decays.

Abstract

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