Probing for the charm content ofBandΥmesons

A slow $J/\psi$ bump exists in the inclusive $\overrightarrow{B}J/\psi +X$ spectrum, while the softness of the $J/\psi$ spectrum in ${\rm Y}\mathrm{}\left(1S\right)\mathrm{}\to J/\psi +X$ decay is in strong contrast to expectations from the color octet mechanism. We propose intrinsic charm as the explanation: the former is due to $\overline{B}\to J/\psi D\pi ,$ with three charm quarks in the final state; the latter is just a small fraction of ${\rm Y}\mathrm{}\left(1S\right)\mathrm{}\to (c\overline{c}{)}_{\mathrm{slow}}+2\mathrm{}$ “jet” events, where the slow moving $c\overline{c}$ system evolves into $D^{\left(*\right)}$ pairs. An experimental search for these phenomena at B factories and the Fermilab Tevatron is strongly urged, as the implications go beyond QCD.