Spin correlations in the reaction "pi \vec D --> \vec\Sigma \Theta^+" and the parity of Theta^+

Abstract

We analyze two types of spin observables in the reaction $\pi \vec D\to\vec\Sigma\Theta^+$ near the threshold. One concerns the spin-transfer coefficients $K_x^x$ and $K_z^z$. The second one is the deuteron spin anisotropy. These observables are sensitive to the $\Theta^+$ parity and can be used as a tool for the $\Theta^+$ parity determination.