Systematics of exotic cascade decays

Theoretical considerations prompted by the discovery of the exotic ${\Theta }^{+}\left(uudd\overline{s}\right)$ led us to propose a dynamical picture emphasizing the role of diquark correlations, which are also useful in elucidating other aspects of low-energy QCD. A notable prediction of this picture is the existence of new exotic and nonexotic $S=-2$ “cascade” baryons with specific, characteristic properties. We argue here that recent observations by the NA49 Collaboration are broadly consistent with our predictions, and propose further tests.