Correlated a _c ⁺ a _c ^- production in e ⁺ e ^- annihilations at √s-10.5 GeV

Using 13.6 fb ^-1 of continuum two-jet e ⁺ e ^- →cc events collected with the CLEO detector, we have searched for baryon number correlations at the primary quark level. We have measured the likelihood for a A _c ⁺ charmed baryon to be produced in the hemisphere opposite a A _c ^- relative to the likelihood for a A _c ^- charmed baryon to be produced opposite an anticharmed meson D; in all cases, the reconstructed hadrons must have momentum greater than 2.3 GeV/c. We find that, given a A _c ^- (reconstructed in five different decay modes), a Ac+ is observed in the opposite hemisphere (0.72±0.11)% of the time (not corrected for efficiency). By contrast, given a D in one hemisphere, a A _c ⁺ is observed in the opposite hemisphere only (0.21 ±0.02)% of the time. Normalized to the total number of either A _c ^- or D "tags," it is therefore 3.52±0.45±0.42 times more likely to find a A _c ⁺ opposite a A~ than a D meson. This enhancement is not observed in the JETSET 7.3 e ⁺ e ^- →cc Monte Carlo simulation.