Near-threshold resonance in $e^{+}e^{-}\rightarrow\Lambda_{c}\bar{\Lambda}_{c}$ process

TL;DR

This paper analyzes the energy dependence of the $e^{+}e^{-}\rightarrow\Lambda_{c}\bar{\Lambda}_{c}$ cross section near threshold, incorporating new experimental data, and predicts a bound state that could influence meson production.

Contribution

It introduces a detailed potential model for the $\Lambda_{c}\bar{\Lambda}_{c}$ system and predicts a bound state near threshold, aligning with recent experimental findings.

Findings

Good agreement with BESIII data on cross sections and form factors.

Prediction of a $\Lambda_{c}\bar{\Lambda}_{c}$ bound state at ~38 MeV below threshold.

Potential impact on understanding light meson production anomalies.

Abstract

We discuss the influence of various contributions of the $\Lambda_{c}\bar{\Lambda}_{c}$ potential on the energy dependence of the cross section $e^{+}e^{-}\rightarrow\Lambda_{c}\bar{\Lambda}_{c}$ 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 $\sim 38~\textrm{MeV}$ below the threshold that may manifest itself in anomalous behavior of light meson production cross sections in a given energy region.