[Clascomment] [EXTERNAL] Re: OPT-IN: First-time measurement of Timelike Compton Scattering

[Silvia Niccolai]

Hi Paul, 
We are working on addressing all comments we are receiving. 
We’ll provide an updated version as soon as the Collaboration-wide review is over. 
Best regards,
Silvia 


Sent from my iPhone

> On 25 Jul 2021, at 23:49, Paul Stoler <stolerpaul at gmail.com> wrote:
> 
> Hi Folks:
> I think both Axel’s and Dan’s comments are insightful. I agree with Axel that one or two sentences describing the D term’s significance would help the PRL reader.
> Cheers,
> Paul
>> On Jul 24, 2021, at 9:17 AM, Axel Schmidt <schmidta at jlab.org> wrote:
>> Dear Pierre, Silvia, Stepan,
>> 
>> Congratulations on this result and a well-written manuscript. I really enjoyed reading it. I hope the following comments are helpful as you make final preparations for submission. 
>> 
>> Best of luck for a speedy trip through peer-review,
>> Axel
>> 
>> 
>> 
>> - There's a slight mismatch between the plurality of the acronyms: FF, PDF, GPD, and CFF. On lines 29 and 30, you define the plural terms "form factors" and "parton distribution functions" with singular acronyms FF and PDF. You use a different convention for "GPDs" and "CFFs." It would sound better to me if it were "FFs" and "PDFs".
>> 
>> - Since the discussion and summary make a big deal of the "D-term," I think that you might consider introducing it and its role to the audience in the Introduction.
>> 
>> - The topic sentence for the paragraph beginning on line 63 introduces BH. The next sentence doesn't seem to follow. Maybe that sentence could move to the paragraph above.
>> 
>> - On line 82, I recommend changing "...the total cross-section over the one of TCS by two orders of magnitude." to "...the total cross-section over that of TCS by two orders of magnitude" to make it easier to parse and avoid number confusion.
>> 
>> - Since the photon energy and Q^2 are determined from the kinematics of the final state particles, I'm a little curious about what resolution you can achieve. I'm also curious what that implies for your determination of the photon polarization. I didn't read the analysis note, so if these are non-issues, feel free to disregard.
>> 
>> - Line 344 "which" -> "that"