DAPNIA-04-18 |
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Possible methods for the determination of the $P$-parity of the $\Theta^+$-pentaquark in NN-collisions. |
M. P. Rekalo, E. Tomasi-Gustafsson |
We present two possibilities to determine the P-parity of the pentaquark $\\Theta^+$, in a model independent way, via the measurement of polarization observables in $p+p\\to \\Theta^+ +\\Sigma^+$, or $n+p\\to \\Theta^+ +\\Lambda^0$, in the near threshold region. Besides the measurement of the spin correlation coefficient, $A_{xx}=A_{yy}$, (in collisions of transversally polarized nucleons), the coefficient $D_{xx}$ of polarization transfer from the initial proton to the final $ \\Sigma^+(\\Lambda^0)$ hyperon is also unambiguously related to the $\\Theta^+$ parity. |