  Self-polarizing weak decays of $\Lambda$-hyperons provide unique insight into
the role of entanglement in the fragmentation of QCD strings through
measurements of the spin correlations of $\Lambda{\bar \Lambda}$-pairs produced
in collider experiments. The simplest quantum field theory representing the
underlying parton dynamics is the four-flavor massive Schwinger model plus an
effective spin-flip term, where the flavors are mapped to light (up/down) and
heavy (strange) quarks and their spins. This construction provides a novel way
to explore hyperon spin-correlations in 1+1-dimensions. We investigate the
evolution of these correlations for different string configurations that are
sensitive to the rich structure of the model Hamiltonian.
