Exotic mesons with hidden bottom near thresholds

TL;DR

This paper investigates exotic bottomonium-like mesons near thresholds using meson exchange models, predicting new states and reproducing known resonances, thereby advancing understanding of heavy hadron spectroscopy.

Contribution

It introduces a meson exchange framework for studying exotic bottom mesons near thresholds and predicts new bound and resonant states, including reproducing observed Zb resonances.

Findings

Reproduced masses of Zb(10608) and Zb(10653)

Predicted additional bound and resonant states in other channels

Provided a comprehensive analysis of B and B* meson interactions

Abstract

We study heavy hadron spectroscopy near open bottom thresholds. We employ B and B* mesons as effective degrees of freedom near the thresholds, and consider meson exchange potentials between them. All possible composite states which can be constructed from the B and B* mesons are studied up to the total angular momentum J = 0, 1, 2. We consider, as exotic states, isosinglet states with exotic (J,PC) quantum numbers and isotriplet states. We solve numerically the Schrodinger equation with channel-couplings for each state. The masses of twin resonances Zb(10608) and Zb(10653) recently found by Belle are reproduced. We predict several possible bound and/or resonant states in other channels for future experiments.