Investigations on heavy quarkonium hybrid mesons with exotic quantum numbers $J^{PC}=2^{+-}$

TL;DR

This paper uses QCD sum rules to predict the masses of heavy quarkonium hybrid mesons with exotic quantum numbers $J^{PC}=2^{+-}$, providing guidance for experimental searches in specific decay channels.

Contribution

It constructs new currents with three Lorentz indices and calculates correlation functions to extract the masses of $2^{+-}$ hybrid states, a novel approach for these exotic quantum numbers.

Findings

Mass of $ar{c}Gc$ hybrid is about 4.49 GeV.

Mass of $ar{b}Gb$ hybrid is about 10.48 GeV.

Suggests experimental search channels for these hybrids.

Abstract

We investigate the heavy quarkonium hybrid mesons with exotic quantum numbers $J^{PC}=2^{+-}$ via QCD sum rule method. We construct the currents with three Lorentz indices and calculate the correlation functions up to dimension six at the leading order of $\alpha _{s}$. The states with $J^{PC}=2^{+-}$ are extracted by constructing the corresponding projection operators. The obtained results indicate that the masses of $2^{+-}$ $\bar{c}Gc$ and $\bar{b}Gb$ hybrid states are about $4.49~\mathrm{GeV}$ and $10.48~\mathrm{GeV}$, respectively. We suggest to search for $\bar{c}Gc$ hybrid meson with $J^{PC}=2^{+-}$ in $J/\psi f_{0,1,2}$ and $\chi_{c0,1,2} \omega$ final states.