Systematic study of exotic $1^{-+}$ tetraquark spectroscopy

Abstract

The masses of exotic quantum-number $1^{-+}$ compact tetraquark states are calculated in a constituent quark model, where a Cornell-like potential is employed as the central potential, spin-spin and spin-orbit coupling derived from the Breit-Fermi interaction are treated as hyperfine corrections, and model parameters are taken from previous works. The ground state $1^{-+}$ P-wave tetraquarks are predicted at 1.9, 4.2, and 6.6~GeV for the light, charmonium-like, and fully-charm sectors, respectively. The decay width ratios of $1^{-+}$ tetraquark states are calculated for two-body strong decay channels within the rearrangement mechanism, including $ωh_1$ and $ηf_1$ for isospin $I=0$ light tetraquarks, $ρh_1$ and $πf_1$ for isospin $I=1$ light tetraquarks, $π/η+χ_{c1}$ and $ρ/ω+ h_c$ for charmonium-like tetraquarks, and $η_c χ_{c1}$ and $J/ψh_c$ for fully-charm tetraquarks. The theoretical results are compared with the observed exotic $1^{-+}$ states, and promising search channels for $1^{-+}$ tetraquarks are discussed. The work suggests that $η_1(1855)$ is unlikely to be a compact tetraquark state.