Exploratory study of possible resonances in the heavy meson - heavy baryon coupled-channel interactions

TL;DR

This study employs a coupled-channel model to explore resonances in heavy meson-baryon interactions, revealing dynamically generated states that relate to observed pentaquarks and extending predictions to the beauty sector.

Contribution

It introduces a unified coupled-channel approach applying SU(3) symmetry to predict resonances in heavy meson-baryon systems, including the hidden beauty sector.

Findings

Resonant and bound states are dynamically generated in the charm sector.

More and tighter resonances are found in the beauty sector due to heavier b-quark mass.

The model relates to recently observed pentaquark states.

Abstract

We use a unitary coupled-channel model to study the $\bar{D} \Lambda_c - \bar{D} \Sigma_c$ interactions. In our calculation, SU(3) flavor symmetry is applied to determine the coupling constants. Several resonant and bound states with different spin and parity are dynamically generated in the mass range of the recently observed pentaquarks. The approach is also extended to the hidden beauty sector to study the $B \Lambda_b - B \Sigma_b$ interactions. As the $b$-quark mass is heavier than the $c$-quark mass, there are more resonances observed for $B \Lambda_b - B \Sigma_b$ interactions and they are more tightly bound.