The Uniqueness of the ${\Theta }^{+}$ Pentaquark

Abstract

The existence of the ${\Theta }^{+}$ pentaquark requires a peculiar mechanism to explain its stability. Looking at quark clusters, notably diquark and triquark configurations, such a mechanism may be found in the color-magnetic interaction between quarks. It is possible to understand why the ${\Theta }^{+}$ is unique. Chiral dynamics, in particular the ease of pion emission, will render other members of the same flavor antidecuplet, such as the ${\Xi }^{--}$ very unstable.

6 pages, 5 figures, 19th European Few Body Conference