[Clascomment] [EXTERNAL] OPT-IN: First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region

[Stepan Stepanyan]

Dear Maxime,

Thanks for considering my comments. Here are few more comments.

- line 100, “well-reconstructed proton”, can we avoid such statements? What does that mean, what do we want to emphasize that there are not well-reconstructed protons? Why?

=> "well-reconstructed" is implying "after performing quality cuts" (pid + fiducial cuts). A proton going on the edge of DCs may not be well reconstructed. Do you want us to rephrase a bit? We are at the very limit on the number of words for PRL. I cannot promise that I will not have to come back to well-reconstructed if PRL complains about the length of the article though.
You do perform quality cuts for electron and I am sure for the photon too. But you do not call them “well-reconstructed”. My comment was using that phrase for the proton specifically. How about to rewrite that first sentence as:
“Events with a single high energy electron, a single proton, and at least one photon above 2 GeV reconstructed with quality cuts were considered as BH/DVCS candidates”.

- line 182, in the formula, is the mass of N. Can you write M and define it as the mass of the nucleon N.
=> N refers to the letter for the 4-momentum of the target proton in Fig1.
I understand that “N” refers to the nucleon in in Fig.1. But the formula is  for x_B and in the formula you should have the mass of N.

- line 213, “the kinematics at the vertex” is an incorrect statement. The incoming electron can/will radiate before the interaction (vertex).
=> I do not understand your point as I believe the sentence emphasizes indeed the difference between the reconstructed kinematics and the "ones at the vertex" with an incident electron energy a bit lower than the beam due to soft photon emission, the scattered electron enery a bit higher due to various energy loss processes,...
OK, I guess we have different definitions of “vertex”. For me kinematics at the “vertex" means the nominal beam energy and the reconstructed momentum of the scattered electron unaltered. Of course this is not true at the real production (interaction) vertex for reasons you already explained in the paper.

Regards, Stepan

On Sep 14, 2022, at 7:03 AM, DEFURNE Maxime <maxime.defurne at cea.fr<mailto:maxime.defurne at cea.fr>> wrote:

<DVCS_PRL-stepan.pdf>

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