Threshold production of the ${\Theta }^{+}$ in a polarized proton reaction

Abstract

We compute cross sections of ${\Theta }^{+}$ production near threshold for a polarized proton reaction, $\vec{p}\vec{p}\to {\Sigma }^{+}{\Theta }^{+}$ which was recently proposed to determine unambiguously the parity of ${\Theta }^{+}$. Within theoretical uncertainties cross sections for the allowed spin configuration are estimated; it is of order of one microbarn for the positive parity ${\Theta }^{+}$ and about 1/10 microbarn for the negative parity ${\Theta }^{+}$ in the threshold energy region where the s-wave component dominates.

6 pages, 7 figures