Heavy quark spin multiplet structure of $\bar{P}^{(*)}\Sigma_Q^{(*)}$ molecular states

TL;DR

This paper analyzes the heavy quark spin multiplet structures of heavy meson-baryon molecular states, revealing four types of multiplets and their decay properties, with implications for hidden-bottom and hidden-charm sectors.

Contribution

It introduces a classification of heavy quark spin multiplets using light cloud spin basis and explores their decay channels and potential interactions.

Findings

Four types of HQS multiplets identified.

Attractive potentials depend on heavy meson-pion coupling sign.

Decay widths provide insights into HQS multiplet structures.

Abstract

We study the structure of heavy quark spin (HQS) multiplets for heavy meson-baryon molecular states in a coupled system of $\bar{P}^{(*)}\Sigma_{Q}^{(*)}$, with constructing the one-pion exchange potential with S-wave orbital angular momentum. Using the light cloud spin basis, we find that there are four types of HQS multiplets classified by the structure of heavy quark spin and light cloud spin. The multiplets which have attractive potential are determined by the sign of the coupling constant for the heavy meson-pion interactions. Furthermore, the difference in the structure of light cloud spin gives the restrictions of the decay channel, which implies that the partial decay width has the information for the structure of HQS multiplets. This behavior is more likely to appear in hidden-bottom sector than in hidden-charm sector.