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Dear members of the RG-C,
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<div>I hope you were able to tune in to my presentation today at the CLAS collaboration meeting. My slides are at <a href="https://indico.jlab.org/event/863/">https://indico.jlab.org/event/863/</a> (Thursday morning). Please send your comments, and - MOST IMPORTANTLY
- your updated slides. </div>
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<div>About the latter: Those of you who attended today’s meeting, you heard the comments from Patrizia and Volker, which echoed what I have been saying: we do NOT need any additional justification why the Physics is great - we need strong arguments why we need
50% more data! The same theme also comes through in the comments from our reader, which are attached. I tried to do this for the case of inclusive DIS - if any of you can provide the same for their favorite channels, please prepare ONE SLIDE (with overlays)
to send to me. For instance, I would love to replace the “p in D” plot with a prediction what we can learn about nDVCS from the already existing COMPLETE data set, and how our extraction of CFFs (see Silvia’s slide 8 from the RG-B Jeopardy presentation or
another relevant observable) would improve if we could shrink the statistical error bars by about 30% (which is the most we can realistically expect for 40 more PAC days).</div>
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<div>I propose that we use the entire RG-C meeting next week (last one before the PAC) to discuss improvements to my presentation, also in light of Kumericki’s comments. I will respond to him before the PAC.</div>
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<div>Greetings - Sebastian</div>
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<div style="margin: 0px;"><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;"><b>From: </b></span><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;">Krešimir Kumerički <kkumer@phy.hr><br>
</span></div>
<div style="margin: 0px;"><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;"><b>Subject: </b></span><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;"><b>Comments on J12-24-RunGroupC</b><br>
</span></div>
<div style="margin: 0px;"><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;"><b>Date: </b></span><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;">June 27, 2024 at 6:44:20 AM EDT<br>
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<div style="margin: 0px;"><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;"><b>To: </b></span><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;">"Kuhn, Sebastian E." <skuhn@odu.edu><br>
</span></div>
<div style="margin: 0px;"><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;"><b>Cc: </b></span><span style="font-family: -webkit-system-font, "Helvetica Neue", Helvetica, sans-serif;">"Dr. Markus Diehl" <markus.diehl@desy.de>,
"Ilieva, Yordanka" <ILIEVA@sc.edu><br>
</span></div>
<br>
<div>EXTERNAL to ODU: This email is not from an ODU account. Do not click links or open attachments unless you recognize the sender and know the content is safe.<br>
<br>
Dear Sebastian,<br>
<br>
I am a member of the PAC52 assigned to do a first reading<br>
of Run Group C Jeopardy update,<br>
(for which you are the contact person),<br>
<br>
<br>
Since this run group comprises some well-established<br>
and thoroughly reviewed experiments I don't have many<br>
scientific questions.<br>
<br>
Still, PAC has to address some points during Jeopardy review,<br>
and it would be helpful if you had some comments on the following:<br>
<br>
1. Jeopardy instructions say that "If the experiment has already received a<br>
portion of its allocated beam time, the spokespersons should present the status<br>
of the analysis of the existing data and the projected results for the final<br>
complete data set. The goal is to show the physics impact of the beam time<br>
requested in the jeopardy update."<br>
<br>
I notice that update document focuses on the preliminary results from the<br>
already recorded data (actually small part of it), and I don't see any<br>
projections for the complete data set. This would be singularly<br>
helpful to have, but I certainly understand that this<br>
means a lot of work and likely cannot be produced for the PAC meeting. In that<br>
case, PAC will work with what we have.<br>
<br>
2. Is there any change in the status of the collaboration in terms of<br>
institutes, committed staff, and prospective students that could<br>
impact the feasibility of performing and analyzing proposed measurements?<br>
<br>
<br>
3. Finally, I do have one "scientific" question. TAC report says that<br>
your APOLLO target "has been operating with great success". On the<br>
other hand, you mention problems with pre-irradiation of this target<br>
and consequently the sub-optimal polarization in the first part of<br>
your run, so the remaining 1/3 of the originally requested 120 PAC<br>
days, if approved, would result in more than 1/3 of the additional<br>
statistics. Could this improvement (or previous degradation) be somehow<br>
roughly quantified in terms of some effective PAC days or related quantifier?<br>
<br>
Also, when you write in the third-to-last sentence of the report<br>
"... mostly due to (deuterated) ammonia samples ..." do you mean that<br>
measurements with ND3 were more affected by the pre-irradiation problem<br>
than those with NH3, or is the problem ND3-NH3 symmetric? Because if it<br>
is not symmetric wouldn't it make sense to favor ND3 for the remaining data taking?<br>
(Related to this, I am confused by your Beam Requirements List which looks like you<br>
are asking for 40 days (960 hours) for each of the 5 targets.)<br>
<br>
<br>
Thank you for any comments you can provide.<br>
<br>
Best regards,<br>
Kresimir<br>
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