Review of phenomenological analyses of η^(′) π resonances

2018/12/03 by A. Rodas, A. Pilloni, Rodas, A. +3
Mathematics · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Spectral Theory in Mathematical Physics

paper · pdf · doi:10.48550/arxiv.1812.00630

openalex publication_date 2018/12/03 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We present a robust analysis of the η^(′) π 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 π₁(1600) decaying to both η^(′) π final states, and the resonance parameters of the a₂(1320) and a'₂(1700). We find no evidence for a second exotic state, which is compatible with recent Lattice QCD estimates.

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