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Dear Maxime,
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<div class="">Thanks for great results and a nice paper.</div>
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<div class="">Regards, Stepan<br class="">
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<div class="">On Sep 15, 2022, at 5:18 AM, DEFURNE Maxime <<a href="mailto:Maxime.Defurne@cea.fr" class="">Maxime.Defurne@cea.fr</a>> wrote:</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Dear Stepan,</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">You are right regarding the "well-reconstructed proton". I have implemented your suggestion.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Regarding xB, I have chosen to write its Lorentz-invariant expression that is valid for all experiments, as opposed to q2/(2M\nu) only valid in frame where the target proton is at rest.<span class="Apple-converted-space"> </span><br class="">
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">And I confirm that we have different definition of vertex. For ne vertex=true kinematics.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Best,</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Maxime</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">PS: The new version of the article with your suggestion is attached to this e-mail.<span class="Apple-converted-space"> </span><br class="">
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<font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">De :</b><span class="Apple-converted-space"> </span>Stepan Stepanyan <<a href="mailto:stepanya@jlab.org" class="">stepanya@jlab.org</a>><br class="">
<b class="">Envoyé :</b><span class="Apple-converted-space"> </span>mercredi 14 septembre 2022 16:58:13<br class="">
<b class="">À :</b><span class="Apple-converted-space"> </span>DEFURNE Maxime<br class="">
<b class="">Cc :</b><span class="Apple-converted-space"> </span><a href="mailto:clasmbr@jlab.org" class="">clasmbr@jlab.org</a>;
<a href="mailto:clascomment@jlab.org" class="">clascomment@jlab.org</a>; <a href="mailto:silvia@jlab.org" class="">
silvia@jlab.org</a>; <a href="mailto:guidal@ipno.in2p3.fr" class="">guidal@ipno.in2p3.fr</a>;
<a href="mailto:daria@jlab.org" class="">daria@jlab.org</a>; Rafayel Paremuzyan; <a href="mailto:guillaume.christiaens@cea.fr" class="">
guillaume.christiaens@cea.fr</a>; Axel Schmidt<br class="">
<b class="">Objet :</b><span class="Apple-converted-space"> </span>Re: [EXTERNAL] OPT-IN: First CLAS12 measurement of DVCS beam-spin asymmetries in the extended valence region</font>
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Dear Maxime,
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<div class="">Thanks for considering my comments. Here are few more comments.</div>
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<font size="2" class=""><span class="" style="font-size: 10pt;"><i class="">- 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?</i></span></font></div>
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<font size="2" class="" style="font-family: Calibri, Helvetica, sans-serif;"><i class="">=> "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. <br class="">
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<div class=""><b class="">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:</b></div>
<div class=""><b class="">“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”. </b></div>
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<font size="2" class=""><span class="" style="font-size: 10pt;"><i class="">- line 182, in the formula, is the mass of N. Can you write M and define it as the mass of the nucleon N.</i></span></font></div>
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<font size="2" class=""><span class="" style="font-size: 10pt;"><i class="">=> N refers to the letter for the 4-momentum of the target proton in Fig1. <br class="">
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<div class=""><b class="">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.</b></div>
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<font size="2" class=""><span class="" style="font-size: 10pt;"><i class="">- line 213, “the kinematics at the vertex” is an incorrect statement. The incoming electron can/will radiate before the interaction (vertex).</i></span></font></div>
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<font size="2" class=""><span class="" style="font-size: 10pt;"><i class="">=> 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,...<br class="">
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<div class=""><font size="2" class=""><b class="">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.</b></font></div>
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<div class=""><font size="2" class="">Regards, Stepan </font></div>
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<div class="">On Sep 14, 2022, at 7:03 AM, DEFURNE Maxime <<a href="mailto:maxime.defurne@cea.fr" class="">maxime.defurne@cea.fr</a>> wrote:</div>
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<div class=""><span id="cid:31E0057F-956D-4C14-BC56-A7E75554F924@jlab.org" class=""><DVCS_PRL-stepan.pdf></span></div>
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<span id="cid:7D39240B-DDE1-461B-AC32-6F50093A83CF"><DVCS_PRL-stepan_v2.pdf></span></div>
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