Proton-η′ interactions at threshold

doi:10.1016/j.physletb.2018.06.034

2018-10-01

DOI：10.1016/j.physletb.2018.06.034

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摘要

En 中文

Recent data on photoproduction of eta ' 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 eta ' p -> eta ' p scattering amplitude in the threshold region were fit to yield the eta ' pscattering length and the interaction range. This new analysis found vertical bar alpha eta ' p vertical bar =(0.403 +/- 0.015 +/- 0.060) fm and a phase phi=(87 +/- 2)degrees, 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-eta ' resonance might exist. However, the scattering length was found to be relatively insensitive to the possible existence of this narrow resonance. (C) 2018 The Authors. Published by Elsevier B.V.

Keyword:

Baryon spectroscopy

Meson photoproduction

Polarization observables

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期刊

Physics Letters B

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4.5

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3.2W

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7.3W

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Petersburg Nuclear Physics Institute

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Helmholtz Association

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national research centre - kurchatov institute

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1.0W

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