Charm production in antiproton-proton annihilation

TL;DR

This paper investigates charm meson and baryon production in antiproton-proton annihilation near threshold energies, comparing different theoretical models and providing predictions for cross sections relevant to experimental searches.

Contribution

It introduces a novel approach connecting charm production processes via SU(4) symmetry and compares predictions with existing models, highlighting significant differences.

Findings

Predicted cross sections for antiLambda_c-Lambda_c are 1-7 mb, much larger than other models.

Cross sections for antiD-D are around 10^{-2} to 10^{-1} microbarn, consistent with other studies.

The approach accounts for initial and final state interactions rigorously.

Abstract

We study the production of charmed mesons (D) and baryons (Lambda_c) in antiproton-proton (app) annihilation close to their respective production thresholds. The elementary charm production process is described by either baryon/meson exchange or by quark/gluon dynamics. Effects of the interactions in the initial and final states are taken into account rigorously. The calculations are performed in close analogy to our earlier study on app -> antiLambda-Lambda and app -> antiK-K by connecting the processes via SU(4) flavor symmetry. Our predictions for the antiLambda_c-Lambda_c production cross section are in the order of 1 to 7 mb, i.e. a factor of around 10-70 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. On the other hand, the resulting cross sections for antiD-D production are found to be in the order of 10^{-2} -- 10^{-1} microbarn and they turned out to be comparable to those obtained in other studies.