OPT-IN: Measurement of the near-threshold J/ψ photoproduction cross section with the CLAS12 experiment

Daniel Carman carman at jlab.org
Thu Feb 12 08:41:21 EST 2026


Pierre,

I have read through the Feb. 10 draft of your CLAS12 J/psi paper that the committee
used to sign off. I do not know if this is exactly the same as the version that Bryan
posted. I have just a few last things that I found.

Regards,
Daniel
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1) The last sentence before Eq.(5) is repetitive of the previous sentence. I recommend
".. massless scattered electron. These quantities were reconstructed as".

2) You use "ndf" (number of degrees of freedom), but you do not define this. Perhaps a
parenthetical remark in the Fig. 4 caption?

3) Fig. 4. The "psi" symbol in each of your 3 figure keys (where it says "J/psi yield")
is badly distorted and looks like an ink blob on my copy.

4) Section IV.E. Line 559. Use "... of each final-state particle. BH ...".

5) Section V.A. Line 637. Give a reference to the "Crystal-Ball function".

6) Table I. Match significant figures of the entries.

7) Table I. Second sub-table title. Use "Scale Systematics".

8) In two places your units are separated by a line break from their corresponding value.
You can keep them together using, e.g, "9~GeV". See line 713 and line 720.

9) Section VI. Line 725. Use "... in Ref. [32], which includes open-charm ...".

10) First line after Eq.(18). Use "where $m_A$, $C_g(0)$, and $m_C$ are ...".


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