Molecular pentaquark states with open charm and bottom flavors

TL;DR

This paper predicts the existence of new molecular pentaquark states with open charm and bottom flavors using a coupled-channel approach and Bethe-Salpeter equation analysis, expanding the understanding of exotic hadrons.

Contribution

It introduces a theoretical framework to identify potential molecular pentaquark states with open charm and bottom flavors through meson-baryon interactions and pole analysis.

Findings

Predicted several molecular pentaquark states with specific quark contents and isospins.

Identified these states as dynamically generated from vector meson exchanges.

Provided mass and quantum number estimates for these states.

Abstract

We study the possibly-existing molecular pentaquark states with open charm and bottom flavors, {\it i.e.}, the states with the quark contents $c\bar{b}qqq$ and $b\bar{c}qqq$ ($q=u,d,s$). We investigate the meson-baryon interactions through the coupled-channel unitary approach within the local hidden-gauge formalism, and extract the poles by solving the Bethe-Salpeter equation in coupled channels. These poles qualify as molecular pentaquark states, which are dynamically generated from the meson-baryon interactions through the exchange of vector mesons. Our results suggest the existence of the $\Sigma_c^{(*)} B^{(*)}$ and $\Sigma_b^{(*)} \bar{D}^{(*)}$ molecular states with isospin $I=1/2$, the $\Xi_c^{(\prime,*)} B^{(*)}$ and $\Xi_b^{(\prime,*)} \bar{D}^{(*)}$ molecular states with isospin $I=0$ and $I=1$, as well as the $\Omega_c^{(*)} B^{(*)}$ and $\Omega_b^{(*)} \bar D^{(*)}$ molecular states with isospin $I=1/2$.