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

2025/04/08 by Ma, Zi-Xuan, Huang, Qi, Chen, Rui +5
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2504.05818

Abstract

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 (qqg) with J^P=1^-+, we find the π₁(1600) and η₁(1855) may not be explained as 1^-+ hybrids, simultaneously, and the η₁(1855) observed by BESIII may not be a hybrid. In addition, we predict an existence of a hybrid η₁(1640), which can be verified by searching the a₁(1260)π channel. Moreover, we suggest the K₁(1270)K and K₁(1270)π as the golden channels to search for an isospin-0 and an isospin-(1)/(2) hybrids, respectively.

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