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We study the productions of charmed baryons ${\bar \Lambda}_c^- \Lambda_c^+$,${\bar \Lambda}_c^- \Sigma_c^+$, and ${\bar \Sigma}^- \Sigma_c^+$ in theantiproton-proton collisions within an effective Lagrangian model that has onlythe baryon-meson degrees of freedom and involves the physical hadron masses.The baryon production proceeds via the $t$-channel exchanges of $D^0$ and$D^{*0}$ mesons in the initial collision of the antiproton with the targetproton. The distortion effects in the initial and final states are accountedfor by using an eikonal approximation-based procedure. We find that thereaction amplitudes of all the production channels are dominated by the$D^{*0}$ meson-exchange diagrams. We discuss the relative roles of tensor andvector components of the $D^{*0}$ coupling in the $D^{*0}$ meson-exchangecomponent of the total production cross sections. The magnitudes of the crosssections are predicted for each final state for the range of beam momenta ofrelevance to the ${\bar P}ANDA$ experiment.

Charmed-baryon production in antiproton-proton collisions within an effective Lagrangian model