OPT-IN: Photoproduction of η mesons off the proton for 1.2 < Eγ < 4.7 GeV using CLAS at Jefferson Laboratory

[Igor Strakovsky]

Dear Leading Authors,

Thank you very much for your very good write up.  Please find enclosed several my concerns 
regarding your draft for your consideration

1) pg 2, left.  Formally, "Regge" model calls differently ("Regge" is slang).  
For refs see, for instance
G. Zweig, Nuovo Cim 32, 689 (1964)
J. P. Ader et al, Nucl Phys B3, 407 (1967)
G.R. Goldstein and J.F. Owens, Phys Rev D 7, 865 (1973)

2) The right graph on Fig 1 is not really good as well.

3) pg 2, line 47, right: The word "older" does not sound good.  Probably "previous" will be better or something else

4) pg 2, lines 79-80, right: You have to explain the purpose of the quantometer in the experiment
or remove this ref.

5) pg 3 left, Table 1.  The current status of meson (in particular eta) photoproduction DB is at
D. Ireland, E. Pasyuk, and I. Strakovsky, Photoproduction reactions and non-strange baryon spectroscopy, to be published in Progress in Particle and Nucl. Phys. (2020); arXiv:1906.04228 [nucl-ex].

6) "(Color online)" for figure captions is unnecessary these days as PRC said a while ago.

7) One recent CBELSA paper is missing in your overview. New data on γ p →ηp with polarized photons 
and protons and their implications for N∗→Nη decays CBELSA/TAPS Collaboration (J. Müller et al.). Sep 18, 2019. 10 pp. e-Print: arXiv:1909.08464 [nucl-ex]

Cheers, igor