Towards the establishment of the light $J^{P(C)}=1^{-(+)}$ hybrid nonet

Abstract

The observation of the light hybrid candidate ${\eta }_1(1855)$ by the BESIII Collaboration brings great opportunities for advancing our knowledges about exotic hadrons in the light flavor sector. We show that this observation provides a crucial clue for establishing the $J^{P(C)}=1^{-(+)}$ hybrid nonet. Based on the flux tube model picture, the production and decay mechanisms for the $J^{P(C)}=1^{-(+)}$ hybrid nonet in the $J/\psi$ radiative decays into two pseudoscalar mesons are investigated. In the $I=0$ sector, we find that the SU(3) flavor octet and singlet mixing is non-negligible and apparently deviates from the flavor ideal mixing. Since only signals for one isoscalar ${\eta }_1(1855)$ are observed in the $\eta {\eta }^{\prime }$ channel, we investigate two schemes of the nonet structure in which ${\eta }_1(1855)$ can be either the higher or lower mass state that strongly couples to $\eta {\eta }^{\prime }$. Possible channels for detecting the multiplets are suggested. In particular, a combined analysis of the hybrid production in $J/\psi \to VH$, where $V$ and $H$ stand for the light vector mesons and $1^{-(+)}$ hybrid states, may provide further evidence for this nonet structure and finally establish these mysterious exotic species in experiment.

Revtex, 12 pages, 10 figures; revised version with updated numerical results, conclusion intact, resubmitted to Chinese Physics C

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Cited by in corpus (23)

• An updated review of the new hadron states
• Possible structure of the newly found exotic state ${\eta }_1(1855)$
• $S$- and $P$-wave fully-strange tetraquark states from QCD sum rules
• $1^{-+}$ Hybrid in $J/\psi$ Radiative Decays from Lattice QCD
• Production of the ${\eta }_1(1855)$ through kaon induced reactions under the assumptions that it is a molecular or a hybrid state
• Constructing the $J^{P(C)}=1^{-(+)}$ light flavor hybrid nonet with the newly observed ${\eta }_1(1855)$
• On the ${\eta }_1(1855)$, ${\pi }_1(1400)$ and ${\pi }_1(1600)$ as dynamically generated states and their SU(3) partners
• Radiative production and decays of the exotic ${\eta }_1^{\prime }(1855)$ and its siblings
• Light double-gluon hybrid states from QCD sum rules
• Highly excited and exotic fully-strange tetraquark states
• Fully-strange tetraquark states with the exotic quantum numbers $J^{PC}=0^{+-}$ and $2^{+-}$
• Predictions of the hybrid mesons with exotic quantum numbers $J^{PC}=2^{+-}$
• Light double-gluon hybrid states with the exotic quantum numbers $J^{PC}=1^{-+}$ and $3^{-+}$
• Revealing the inner structure of the newly observed ${\eta }_1(1855)$ via photoproduction
• Investigating ${\eta }_1^{\prime }(1855)$ exotic states in $J/\psi \to {\eta }_1^{\prime }(1855){\eta }^{(\prime )}$ decays
• Mixing angle of $K_1(1270/1400)$ and the $K{\bar{K}}_1(1400)$ molecular interpretation of ${\eta }_1(1855)$
• Mass spectrum of the hidden-charm hybrid states via the QCD sum rules
• Proper constituent gluon mass as the final piece to construct hybrid mesons
• Decay properties of light $1^{-+}$ hybrids
• Light tetraquark states with exotic quantum numbers $J^{PC}=2^{+-}$
• Double-gluon charmonium hybrid states with various (exotic) quantum numbers
• Revisit the heavy quarkonium double-gluon hybrid mesons with exotic quantum numbers
• Systematic study of exotic $1^{-+}$ tetraquark spectroscopy