On the η1(1855), π1(1400) and π1(1600) as Dynamically Generated States and Their SU(3) Partners

In this work, we interpret the newly observed $\eta_1(1855)$ resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in $I=0$ sector, reported by BESIII Collaboration, as a dynamically generated state from interaction between lightest pseudoscalar mesons and axial-vector mesons. The is derived lowest order chiral Lagrangian which Weinberg-Tomozawa term obtained, describing transition amplitudes among relevant channels, are then unitarized using Bethe-Salpeter equation, according to unitary approach. We evaluate decays into $\eta\eta^{\prime}$ $K\bar{K}^*\pi$ channels find that latter has larger branching fraction. also investigate its SU(3) partners, our findings, $\pi_1(1400)$ $\pi_1(1600)$ structures may correspond states, former one coupled mostly $b_1\pi$ component $K_1(1270)\bar{K}$ channel. particular, result for ratio $\Gamma(\pi_1(1600)\to f_1(1285)\pi)/ \Gamma(\pi_1(1600)\to \eta^{\prime}\pi)$ consistent measured value, supports interpretation higher $\pi_1$ state. report two poles mass about 1.7~GeV $I=1/2$ be responsible $K^*(1680)$. suggest searching additional $\eta_1$ masses around 1.4 1.7~GeV. predicted $\eta_1(1700)$ expected have width 0.1~GeV can decay easily $K\bar K\pi\pi$.