Abstract
It has been recently conjectured by Selem and Wilczek 1 the existence of a ss-[ud] meson due to strong correlations between the two light antiquarks. We make a detailed study of this system within a dynamical quark model which has proven to be successful in reproducing the most important features of low-energy hadron phenomenology. Our results, obtained within a parameter-free calculation, show that the antidiquark component of the ssud system indeed entails the stronger attraction, and drives its energy much lower than the N{xi} threshold, but still above the K{sup 0}K*{sup -} or K*{sup 0}K{sup -} thresholds. We have also studied the ccud and bbud systems. Exotic mesons are only expected to exist in the limit of large mass for the two-quark subsystem, bbud, since the calculated mass is below the B{sup 0}B*{sup -} or B*{sup 0}B{sup -} thresholds.
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