Masses of vector and pseudovector hybrid mesons in a chiral symmetric model

Abstract

We enlarge the chiral model, the so-called extended Linear Sigma Model (eLSM), by including the low-lying hybrid nonet with exotic quantum numbers $J^{PC}=1^{-+}$ and the nonet of their chiral partners with $J^{PC}=1^{+-}$ to a global $U(3{)}_r\times U(3{)}_l$ chiral symmetry. We use the assignment of the ${\pi }_1^{hyb}={\pi }_1(1600)$ as input to determine the unknown parameters. Then, we compute the lightest vector and pseudovector hybrid masses that could guide ongoing and upcoming experiments in searching for hybrids.

Comments: 6 pages, 1 table, Contribution to the XXXIII International Workshop on High Energy Physics "Hard Problems of Hadron Physics: Non-Perturbative QCD & Related Quests", 08-12 November 2021