Proton-η interactions at threshold

A. V. Anisovich, V. Burkert, Michael Dugger, E. Klempt, V. A. Nikonov, Barry Ritchie, A. V. Sarantsev, U. Thoma

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Recent data on photoproduction of η mesons off protons have been included in the data base for the Bonn–Gatchina partial wave analysis. The real and imaginary parts of the S-wave ηp→ηp scattering amplitude in the threshold region were fit to yield the ηp scattering length and the interaction range. This new analysis found |aηp|=(0.403±0.015±0.060) fm and a phase ϕ=(87±2), while the range parameter is not well-constrained. The striking behavior of the GRAAL data on the beam asymmetry in the threshold region suggests that a narrow proton-η resonance might exist. However, the scattering length was found to be relatively insensitive to the possible existence of this narrow resonance.

Keywords

  • Baryon spectroscopy
  • Meson photoproduction
  • Polarization observables

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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