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Using the symmetry properties of the strong interaction, such as the Pauliprinciple, the P-invariance, the conservation of the total angular momentum andisotopic invariance, we establish the spin structure of the threshold matrixelements for the processes $p+p\to \Theta^+ +\Sigma^+$ and $n+p\to \Theta^++\Lambda^0$, in a model independent way, which applies to any spin and parityof the $\Theta^+$-hyperon in the near threshold region. We predict the doublespin observables for these processes, such as the dependence of thedifferential cross section on the polarizations of the colliding nucleons, andthe coefficients of polarization transfer from a nucleon beam or target to theproduced $\Sigma^+$ or $\Lambda^0$ hyperon. We prove that these observables aresensitive to the P-parity of the $\Theta^+$ baryon, for any value of its spin.As an example of dynamical considerations, we analyzed these reactions in theframework of K-meson exchange.Comment: 14 pages 1 figur

european physical journal. a, hadrons and nuclei

Polarization observables in the processes $p + p\to \Theta^ + + \Sigma^ + $ and $n + p\to \Theta^ + + \Lambda^0$ , in the threshold region, for any spin and parity of the $\Theta^ + $ -hyperon