Decay properties of the 1-+ hybrid state

Within the framework of the QCD sum rules, we consider the three-point correlation function, work at the limit q(2) -> 0 and m(pi) -> 0, and pick out the singular term similar to 1/q(2) to extract the pionic coupling constants of the 1(-+) hybrid meson. Then, we calculate the decay widths of different modes. The decay width of the S-wave modes b(1)pi, f(1)pi increases quickly as the hybrid meson mass and decay momentum increase. But for the low mass hybrid meson around 1.6 GeV, the P-wave decay mode rho pi is very important and its width is around 180 MeV, while the widths of eta pi and eta'pi are strongly suppressed. We suggest the experimental search of pi(1)(1600) through the decay chains at the Beijing Spectrometer: J/psi(psi') -> pi(1) + gamma or J/psi(psi') -> pi(1) + rho, where the pi(1) state can be reconstructed through the decay modes pi(1) -> rho pi -> pi(+) pi(-) pi(0) or pi(1) -> f(1)(1285) pi(0). It is also interesting to look for pi(1) using the available BELLE/BABAR data through the process e(+)e(-) -> gamma* -> rho pi(1), b(1)pi(1), gamma pi(1), etc.