Diquark model of exotic mesons

TL;DR

This paper discusses the diquark model of exotic mesons, suggesting such states are unlikely to be observed experimentally due to their high masses and broad decay widths, with some exceptions like certain $udar{b}ar{b}$ states.

Contribution

It provides an analysis of the diquark model's implications for the observability of exotic mesons, highlighting mass and decay width challenges.

Findings

Exotic mesons as diquark-antidiquark states have high masses.

Such states likely have large decay widths, making them hard to detect.

Some specific configurations like $udar{b}ar{b}$ may be observable in the future.

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 $ u d \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.