  The measurement of transverse single-spin asymmetries for baryon production
in the target fragmentation region of semi-inclusive deep-inelastic scattering
(SIDIS), can produce important insight into those nonperturbative aspects of
QCD directly associated with confinement and with the dynamical breaking of
chiral symmetry. We discuss here, interns of spin-directed momentum transfers,
the powerful quantum field-theoretical constraints on the spin-orbit dynamics
underlying these transverse spin observables. The spin-directed momentum
shifts, originating either in the target nucleon or in the QCD jets produced in
the deep inelastic scattering process, represent significant quantum
entanglement effects connecting information from current fragmentation with
observables in target fragmentation.
