The strong coupling constants of doubly heavy baryons with heavy mesons

TL;DR

This paper calculates the strong coupling constants between doubly heavy baryons, singly heavy baryons, and heavy mesons using light cone QCD sum rules, aiding experimental and theoretical studies of these particles.

Contribution

It provides the first comprehensive calculation of these strong couplings using light cone QCD sum rules with numerical predictions and error analysis.

Findings

Numerical values for strong coupling constants are provided.

Results can be used to analyze decay processes of doubly heavy baryons.

The study offers theoretical tools for experimental data analysis.

Abstract

In the experiment, only one doubly charmed baryon $\Xi_{cc}^{++}$ was successfully identified. The LHCb collaboration is poised to discover other doubly heavy baryon, $\Xi_{cc}^{+}$ and $\Xi_{bc}^{+}$, necessitating a comprehensive study of doubly heavy baryons from various perspectives. Such investigations will elucidate the properties of the newly discovered states and facilitate the search for other doubly heavy baryons as predicted in quark model. In this paper, we explore the strong coupling between the doubly heavy baryon, singly heavy baryon, and heavy meson, ${\cal B}_{QQ^{\prime}}{\cal B}_{Q}M_{Q^{\prime}}$, using the light cone QCD sum rules approach. We analytically and numerically calculate the strong coupling, ${\cal B}_{QQ^{\prime}}{\cal B}_{Q}M_{Q^{\prime}}$, utilizing the light-cone distribution amplitudes of the singly heavy baryon ${\cal B}_{Q}$. The numerical predictions for these strong couplings are provided, along with the error analysis. Our theoretical findings can be employed to examine the strong and weak decay dynamics of doubly heavy baryons. Furthermore, our results may offer experimentalists a valuable tool for analyzing data on the strong coupling constants among hadronic multiplets.