Exotic Baryons from the Chiral Quark Soliton Model

Abstract

From the interpretation of the ${\Theta }^{+}(1540)$ and ${\Xi }_{3/2}(1862)$ baryons as an excitation of the ``skyrmion liquid'' with SU(3) flavour symmetry $\overline{10}$ we deduce a new series of baryons, ${\Theta }_1^{++}$, ${\Theta }_1^{+}$ and ${\Theta }_1^0$, situated at the top of the 27-plet of SU(3) flavour, with hypercharge Y=2, isospin I=1 and spin $J=\frac{3}{2}$. The ${\Theta }_1$ mass and width are estimated from the chiral quark soliton model. We demonstrate that the predicted mass, $m_{{\Theta }_1}=1599MeV/{\mathrm{c}}^2$, and broad width are in qualitative conflict with experiment which shows no structure in the total $K^{+}p$ cross section near $P_{\mathrm{lab}}=585$ MeV/c. We also discuss properties of other exotic baryons from the 27- and 35-plets.

Comments: 5 pages, 2 figures