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.