Unitary Coupled-Channel Deck Model and theQMeson Resonance Region

We construct a unitary Deck model with coupled $K^{*}\pi$ and $K\rho$ channels, including only one resonance in the $Q$ region. Adjusting the resonance parameters, we achieve a satisfactory description of the experimental phase variations and the structure in the mass spectra. The resonance is determined to belong to the $J^{\mathrm{PC}}=1^{+-}$ SU(3) octet, and is thus the $Q_B$. The relative coupling strength $\frac{K^{*}\pi }{K\rho }$ is $\sim \frac{2}{3}$.