The reaction ppbar -> Lambda_c-Lambda_cbar close to threshold

TL;DR

This paper predicts the cross sections for antiproton-proton to antiLambda_c-Lambda_c near threshold using a meson-exchange model, finding results significantly larger than other models but smaller than related processes.

Contribution

It introduces a meson-exchange framework for charm baryon production near threshold, extending previous Lambda production studies via SU(4) symmetry.

Findings

Cross sections are estimated to be 1-7 microbarns.

Predicted cross sections are 10 times smaller than Lambda production.

Predictions are 100-1000 times larger than other models.

Abstract

Predictions for the charm-production reaction antiproton-proton -> antiLambda_c-Lambda_c for energies near the threshold are presented. The calculations are performed in a meson-exchange framework in close analogy to our earlier study on antiproton-proton -> antiLambda-Lambda by connecting the two processes via SU(4) symmetry. The obtained antiLambda_c-Lambda_c production cross sections are in the order of 1 to 7 \mub, i.e. a factor of around 10 smaller than the corresponding cross sections for antiLambda-Lambda. However, they are 100 to 1000 times larger than predictions of other model calculations in the literature.