Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV
M. Sumihama, D.S. Ahn, J.K. Ahn, H. Akimune, Y. Asano, W.C. Chang, S., Date, H. Ejiri, H. Fujimura, M. Fujiwara, S. Fukui, S. Hasegawa, K. Hicks, T., Hotta, K. Imai,0 T. Ishikawa, T. Iwata, Y. Kato, H. Kawai, K. Kino, H. Kohri,, N. Kumagai, T. Matsuda, T. Matsumura, T. Mibe
TL;DR
This study measures eta meson photoproduction cross sections at backward angles and identifies a unique bump structure above 2.0 GeV, suggesting a baryon resonance with strong ss-bar coupling.
Contribution
First measurement of eta photoproduction cross sections at backward angles in the 1.6-2.4 GeV range revealing a new resonance feature.
Findings
Observed a bump structure above 2.0 GeV in eta photoproduction
No such bump in eta', omega, or pi0 channels
Suggests a baryon resonance with strong ss-bar coupling
Abstract
Differential cross sections for eta photoproduction off protons have been measured at E_gamma = 1.6 - 2.4 GeV in the backward direction. A bump structure has been observed above 2.0 GeV in the total energy. No such bump is observed in cross sections for eta', omega and pi0 photoproductions. It is inferred that this unique structure in eta photoproduction is due to a baryon resonance with a large portion of ss-bar strongly coupled to the etaN channel.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research