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

Abstract

We show that definite polarization observables for the simplest electroproduction processes, $\ell +N\to \ell +B(1/2^{\pm })+M(0^{\pm })$, $B=Y(\Lambda ,\Sigma$ or $Y_c$-hyperon, ${\Theta }^{+}$-pentaquark) and $M=K$, $\bar{K}$ or $D$, are sensitive to the relative P-parity $\pi (B)$ of the NBM-system. The interference of the longitudinal and transversal amplitudes for the collinear regime of the processes ${\gamma }^{\ast }+N\to B+M$(${\gamma }^{\ast }$ is the virtual photon) - at any value of momentum transfer squared and excitation energy of the $BM$-system - generates model independent relations between analyzing powers (in unpolarized lepton scattering by polarized target), from one side, and the components of the produced baryon $B$ polarization. It is important to stress that these relations depend on the above mentioned P-parity, and constitute a model independent method for the determination of unknown parities of strange and charm particles.

Comments: 4 pages