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We present a robust analysis of the $\eta^{(\prime)} \pi$ system in COMPASSdata. We fit the extracted relative phases and intensities with acoupled-channel formalism enforcing both unitarity and analyticity. We providea robust extraction of a single exotic $\pi_1(1600)$ decaying to both$\eta^{(\prime)} \pi$ final states, and the resonance parameters of the$a_2(1320)$ and $a'_2(1700)$. We find no evidence for a second exotic state,which is compatible with recent Lattice QCD estimates.

Review of phenomenological analyses of $\eta^{(\prime)} \pi$ resonances