Hybrid to Quarkonia transitions

TL;DR

This paper updates the spectrum of heavy hybrid mesons in charmonium and bottomonium sectors using lattice QCD, analyzes hybrid-to-quarkonium transitions, and compares results with experimental data to identify hybrid candidates among XYZ mesons.

Contribution

It refines hybrid meson spectrum calculations with latest lattice QCD data and provides a comprehensive analysis of hybrid to quarkonium transitions, including new hybrid candidate identifications.

Findings

Updated heavy hybrid meson spectrum with lattice QCD

Analysis of hybrid to quarkonium transition rates

Identification of hybrid candidates among XYZ mesons

Abstract

Hybrid quarkonia -exotic hadrons with explicit gluonic degrees of freedom- have gained increasing attention in hadron spectroscopy, particularly with the ongoing discovery of new XYZ mesons. In this work, we update the spectrum of heavy hybrid mesons in the charmonium and bottomonium sectors using the Born-Oppenheimer Effective Field Theory framework, by incorporating the latest lattice QCD results for hybrid static potentials. We refine earlier calculations and analyze allowed transitions from hybrids to conventional quarkonia, including both spin-conserved and spin-flip decays. We carry out a comprehensive error analysis and discuss the reliability of our results. We compare them to experimental data of the Particle Data Group, which allows us to identify hybrid candidates among the observed XYZ states. We provide hybrid or quarkonium interpretations for nearly all heavy isospin-zero mesons observed and incorporate new hybrid candidates.