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Estimates of differential cross sections and longitudinal asymmetries arepresented for the reactions $\bar pp\to \bar \Xi\Xi$ and $\bar pp\to \bar\Xi_c\Xi_c$ at energies $\sqrt{s}\lesssim 15$ GeV. The $\Xi$ and $\Xi_c$hyperons are assumed to be produced in two-step processes: first, intermediate$\bar\Lambda\Lambda$ and/or $\bar\Lambda_c\Lambda_c$ states are created whichare converted afterwards into final states $\bar \Xi\Xi$, $\bar \Xi_c\Xi_c$ and$\bar \Xi_c\Xi_c$. The full amplitudes are described by loop diagrams within amodified Regge model, based on the topological decomposition of planar quarkdiagrams. A strong sensitivity of the ratio of yields of $\bar \Xi_c\Xi_c$ to$\bar \Xi\Xi$ and of $\bar \Lambda_c\Lambda_c$ to $\bar \Lambda\Lambda$ to thedegree of SU(4) symmetry violation is found.

Exclusive $\bar\Xi\Xi$ and $\bar\Xi_c\Xi_c$ production in $\bar pp$ collisions at $\sqrt{s}\leq 15$ GeV