P-parity of charm and strange particles in electroproduction processes, in collinear regime

We show that definite polarization observables for the simplest electroproduction processes, ℓ+N→ℓ+B(1/2±)+M(0±), B=Y(Λ,Σ or Yc-hyperon, Θ+-pentaquark) and M=K, K¯ or D, are sensitive to the relative P-parity of the NBM-system, P(NBM). The interference of the longitudinal and transversal amplitudes for the collinear regime of the processes γ*+N→B+M (γ* is the virtual photon)—at any value of momentum transfer squared and excitation energy of the BM-system—generates relations between the analyzing powers (in unpolarized lepton scattering by polarized target), and the components of the produced baryon B polarization which depend on P(NBM). These relations suggest a model independent method for the determination of unknown parities of strange and charm particles and even pentaquark. As an example, we give an estimation of the s-dependence of the relevant asymmetry, in framework of the Regge-pole approach for the reaction γ*+N→Θ++K¯.