Near-threshold resonance in $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ process

Abstract

We discuss the influence of various contributions of the ${\Lambda }_c{\bar{\Lambda }}_c$ potential on the energy dependence of the cross section $e^{+}{e}^{-}\to {\Lambda }_c{\bar{\Lambda }}_c$ near the threshold. New BESIII experimental data on the cross section and electromagnetic form factors $G_E$ and $G_M$ are taken into account. Our predictions are in good agreement with experimental data. We predict a bound state of ${\Lambda }_c{\bar{\Lambda }}_c$ at energy $\sim 38\text{MeV}$ below the threshold that may manifest itself in anomalous behavior of light meson production cross sections in a given energy region.

Comments: 5 pages, 1 figure