Observation of Υ(4S) decays into non-BB¯final states containing ψ mesons

This is the authors' abstract. We don't add key points for this paper.

We report on the observation of {ψ} mesons from {Υ}(4S) decays which are too energetic to come from B mesons. These events provide the first evidence for non-BB{} decays of the {Υ}(4S). The measured rate is B[{Υ}(4s){→}{ψ}X]=(0.22±{}0.06±{}0.04)% for {ψ} momentum above 2 GeV/c.