Revisiting the b1π and ρπ decay modes of the 1â'+ light hybrid state with light-cone QCD sum rules.

We study the ρπ and b1π decay modes of the 1â?'+ light hybrid state within the framework of light-cone QCD sum rules. We use both the tensor current ψσμνψ and the derivative current ψDμγ5ψ as interpolating currents to calculate the partial decay width of the b1π decay mode. Comparing the sum rules obtained by using different currents, we obtain Γ(π1→b1π)=8-23, 32-86 and 52-151 MeV for m1â?'+=1.6, 1.8 and 2.0 GeV respectively, which favor the results from the flux tube models and lattice simulations. We also use the tensor current to study the ρπ decay mode, and although an extended stability criterion is needed, our results suggest a small partial decay width. [ABSTRACT FROM AUTHOR]