Resonances in heavy meson - heavy baryon coupled-channel interactions

TL;DR

This paper investigates the interactions between heavy mesons and baryons using a coupled-channel approach, predicting bound states and resonances that relate to observed pentaquark states and extending understanding of hidden charm dynamics.

Contribution

It introduces a dynamical coupled-channel model to predict new bound states and resonances in the heavy meson-baryon sector, including states near observed pentaquark masses.

Findings

Four S-wave bound states near 4.3-4.5 GeV

Two states with J^P=1/2^- and two with J^P=3/2^-

Predicted additional higher partial wave resonances

Abstract

The interactions of $\bar{D}^{(*)} \Lambda_c - \bar{D}^{(*)}\Sigma_c^{(*)}$ are studied within the framework of a dynamical coupled-channel approach. A series of bound states and resonances with different spin and parity are dynamically generated in the hidden charm sector. Four $S$-wave bound states are found in the mass range of 4.3 to 4.5 GeV, close to the pentaquark states observed by LHCb. Two of the states have a spin parity of $J^P= 1/2^-$ and the other two have $J^P=3/2^-$. In addition, several resonances with different spin and parity in higher partial waves are predicted.