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(') pi resonances / Rodas Bilbao, Arkaitz; Pilloni, Alessandro; Szczepaniak, Adam. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - 336:(2019). (Intervento presentato al convegno XIII Quark Confinement and the Hadron Spectrum (Confinement2018) tenutosi a Maynooth; Ireland) [10.22323/1.336.0091].
Review of phenomenological analyses of eta(') pi resonances
Pilloni, Alessandro;
2019
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 | Dimensione | Formato | |
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