We study the decay of ${\Theta }^{+}$ in a nonrelativistic quark model. The wave function of ${\Theta }^{+}$ is constructed for the two cases $J^P=1/2^{\pm }$ as products of color, spin, flavor, and orbital parts respecting total antisymmetrization among the four quarks. We find that for the negative parity ${\Theta }^{+}$ the width becomes very large which is of order of several hundreds MeV, while it is about a several tens MeV for the positive parity. By assuming additionally diquark correlations, the width is reduced to be of order 10 MeV. It is also pointed out that a similar calculation for $3/2^{-}$ results in strong suppression of its width.

• Received 5 October 2004

DOI:https://doi.org/10.1103/PhysRevD.71.074021