Diquark model of exotic mesons

Abstract

This is a conference mostly devoted to diquarks. Although an exotic meson can in principle be composed of a diquark and an antidiquark, such an exotic is unlikely to be experimentally observable in the near future. The reason, according to the model, is that diquark-antidiquark exotics have masses well above the threshold for decay into two mesons, and are likely to have widths too large to make them observable. A possible exception is a $ud\bar{b}\bar{b}$ exotic, but it will be a long time before such a state can be observed even if it is stable against strong decay.

9 pages, plaintex, no figures