We present a robust analysis of the $\eta^{(\prime)} \pi$ system in COMPASS data. We fit the extracted relative phases and intensities with a coupled-channel formalism enforcing both unitarity and analyticity.
We provide a 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 measured at the COMPASS experiment activities and recent results
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Pre-published on:
September 12, 2019
Published on:
September 26, 2019
Abstract
DOI: https://doi.org/10.22323/1.336.0091
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.