Momentum correlations in heavy-quark hadroproduction

Predictions are presented of correlations in rapidity and in scaled longitudinal momentum (Feynman $x_F$) for associated production of a bottom quark b and its antiquark in high-energy fixed-target and collider experiments. Rapidity correlations are positive but remarkably broad in the central region at current collider energies, extending a factor of 2 beyond the ∼2 units typical of short-range order.