We present a robust analysis of the eta(') 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 pi1(1600) decaying to both eta(') pi final states, and the resonance parameters of the a2(1320) and a2'(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
Pilloni, Alessandro;
2019-01-01
Abstract
We present a robust analysis of the eta(') 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 pi1(1600) decaying to both eta(') pi final states, and the resonance parameters of the a2(1320) and a2'(1700). We find no evidence for a second exotic state, which is compatible with recent Lattice QCD estimates.File in questo prodotto:
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