Hong-Xia Huang | Searcharxiv

arXiv2025

Proper constituent gluon mass as the final piece to construct hybrid mesons

In this letter, we propose that a proper constituent gluon mass $m_g$=450 MeV can be applied to identify the hybrids composed of quarks and gluons. By investigating the spectra and decay widths of the light hybrids $(q\bar{q}g)$ with $J^P=1^{-+}$, we find the $π_1(1600)$ and $η_1(1855)$ may not be explained as $1^{-+}$ hybrids, simultaneously, and the $η_1(1855)$ observed by BESIII may not be a hybrid. In addition, we predict an existence of a hybrid $η_1(1640)$, which can be verified by searching the $a_1(1260)π$ channel. Moreover, we suggest the $K_1(1270)\bar{K}$ and $K_1(1270)π$ as the golden channels to search for an isospin-0 and an isospin-$\frac{1}{2}$ hybrids, respectively.

hep-ph↗

arXiv2024

The role of triangle singularity in isospin breaking process $J/ψ\to Λ\barΛ π$ and the possible evidence of $Σ^*(\frac{1}{2}^-)$ states

In this study, the impact of triangle singularity is investigated in the isospin-breaking process $J/ψ\to Λ\barΛ π$. The triangle singularity is found to play a significant role in the process, resulting in the creation of a resonance-like structure around 1.4 GeV in the $Λπ(\barΛπ)$ invariant mass spectrum. To amplify the impact of this triangle singularity, the presence of two $Σ^*(\frac{1}{2}^-)$ states around 1.4 GeV and 1.6 GeV is essential, yet these states have not been definitively identified in the current baryon spectrum. We recommend that experiments, particularly the Beijing Spectrometer (BESIII) and the future Super Tau-Charm Factory (STCF), to investigate the process $J/ψ\to Λ\barΛ π$ to offer direct evidences for our predicted triangle singularity and additional evidence regarding the $Σ(\frac{1}{2}^-)$ states.

hep-ph↗