Comment on "Evidence for narrow resonant structures at $W\approx$ 1.68 GeV and $W\approx$ 1.72 GeV in real Compton scattering off the proton"

TL;DR

This paper critically examines claims of narrow resonant structures at specific energies in proton Compton scattering, contrasting different experimental observations to clarify their existence.

Contribution

It provides a detailed commentary on the evidence for narrow resonant structures, highlighting discrepancies between different experimental results.

Findings

Resonant structures at W≈1.72 GeV are observed in some measurements.

Discrepancies exist between beam asymmetry and total cross section data.

The paper questions the universality of the claimed resonant features.

Abstract

We comment on the statement by Kuznetsov et al. that the structure around W=1.72 GeV seen in the beam asymmetry in Compton scattering off the proton is not observed in the total cross section of $\eta$ photoproduction on the neutron.