Possible methods for the determination of the P-parity of the $Theta;+-pentaquark in NN-collisions

Abstract

We present two possibilities to determine the P -parity of the pentaquark Θ + , in a model independent way, via the measurement of polarization observables in p + p → Σ + + Θ + , or n + p → Λ 0 + Θ + , 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 = D yy of polarization transfer from the initial proton to the final Σ + ( Λ 0 ) hyperon is also unambiguously related to the Θ + parity.