Evidence for $B^{(*)}_s$ Production at the ϒ(5S)

Based on data collected by the CLEO III detector at CESR, we started a series of investigations to open the mysteries of the ϒ(5 S ) resonance decay properties. Bs mesons are expected to decay predominantly into Ds meson, while the lighter B mesons decay into Ds only about 10% of the time. We exploit this difference to present the first evidence of a substantial production of Bs mesons at the ϒ(5 S ) resonance. We make here a preliminary model dependent estimate of the ratio of [Formula: see text] to the total [Formula: see text] quark pair production at the ϒ(5 S ) energy to be (21 ± 3 ± 9)%.