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

1 Citation (Scopus)

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.

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proton resonance
thresholds
protons
data bases
wave scattering
photoproduction
scattering
scattering amplitude
S waves
mesons
asymmetry
interactions

Keywords

  • Baryon spectroscopy
  • Meson photoproduction
  • Polarization observables

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Proton-η interactions at threshold. / Anisovich, A. V.; Burkert, V.; Dugger, Michael; Klempt, E.; Nikonov, V. A.; Ritchie, Barry; Sarantsev, A. V.; Thoma, U.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 01.01.2018.

Research output: Contribution to journalArticle

Anisovich, A. V. ; Burkert, V. ; Dugger, Michael ; Klempt, E. ; Nikonov, V. A. ; Ritchie, Barry ; Sarantsev, A. V. ; Thoma, U. / Proton-η interactions at threshold. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018.
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AU - Anisovich, A. V.

AU - Burkert, V.

AU - Dugger, Michael

AU - Klempt, E.

AU - Nikonov, V. A.

AU - Ritchie, Barry

AU - Sarantsev, A. V.

AU - Thoma, U.

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AB - 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 η′p→η′p scattering amplitude in the threshold region were fit to yield the η′p scattering length and the interaction range. This new analysis found |aη′p|=(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.

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KW - Meson photoproduction

KW - Polarization observables

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