  We propose a dynamical mechanism which provides an interaction between the
spins of hyperons and antihyperons and the vorticity of the baryon current in
noncentral high energy nuclear collisions. The interaction is mediated by
massive vector and scalar bosons which is well known to describe the nuclear
spin-orbit force. It follows from the Foldy-Wouthuysen transformation and leads
to a strong-interaction Zeeman effect. The interaction may explain the
difference in polarizations of $\Lambda$ and $\bar{\Lambda}$ hyperons as
measured by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider.
The signs and magnitudes of the meson-baryon couplings are closely connected to
the binding energies of hypernuclei and to the abundance of hyperons in neutron
stars.
