First Observation of an Exotic Reggeon

2026/07/20 by G. D. Alexeev, M. G. Alexeev, C. Alice +180
#hep-ex

paper · pdf

Abstract

We present new \compass high-statistics measurements of the peripheral production of ηπ^- and η^′ π^- pairs in the reactions π^- p → η^(′)π^- p. For the first time, we perform an unbinned analysis of the high-mass region of the ηπ^- and η^′π^- systems, which allows us to disentangle the exchange mechanisms governing their production. We report the first observation in high-energy scattering of an exotic Reggeon with high significance exceeding 5 σ for both channels, which is, most likely, related to the exotic π₁(1600).8

Related

• High-energy η^(′)π photoproduction and the nature of exotic waves
• Review of phenomenological analyses of η^(′) π resonances
• Mechanisms of the Reaction π^-p→ a⁰₀(980)n→π⁰ηn at High Energies
• Manifestations of anomalous glue: light-mass exotic mesons and the eta-prime nucleon coupling constant
• Production of 1^-+ exotic charmonium-like states in electron-positron collisions