The Strong Decay Properties of the 1⁻⁺ Hybrid Mesons

Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University, Beijing 100871, China

^a e-mail: pzhuang@pku.edu.cn
^b e-mail: chx@water.pku.edu.cn
^c e-mail: zhusl@pku.edu.cn

Abstract

We calculate the coupling constants of the decay modes 1⁻⁺ → ρπ, f₁π, b₁π, ηπ, ήπ, a₁π, f₁η within the framework of the light-cone QCD sum rule. Then we calculate the partial widths of these decay channels, which differ greatly from the existing calculations using phenomenological models. For the isovector 1⁻⁺ state, the dominant decay modes are ρπ, f₁π. For its isoscalar partner, its dominant decay mode is a₁π. We also discuss the possible search of the 1⁻⁺ state at BESIII, for example through the decay chains J/ψ(ψ’) → π₁ + γ or J/ψ(ψ’) → π₁ + ρ where π₁ can be reconstructed through the decay modes π₁ → ρπ → π⁺π^-π⁰ or π₁ → f₁(1285)π⁰. Hopefully the present work will be helpful to the experimental establishment of the 1⁻⁺ hybrid meson.