[Rgc] [Rgc_analysis] RGC-analysis meeting tomorrow

[Darren Upton]

RG-C Analysis Crew,

I made a first full pass of the run-based PbPt from DIS for all NH3 and ND3 run periods. These use my latest dilution factor model and fiducial cuts that mostly match her electron cuts. I find that the DIS results are more or less consistent with those from Noémie's analysis of elastics.

However, the comparison between scattering-observables and NMR remains at odds. For NH3, NMR generally underestimates the polarization but it depends on the run period and epoch in question. For instance, Spring '23 is an absolute mess where NMR and DIS disagree dramatically for earlier runs then eventually agree near the end of running. ND3 is a mixed bag because sometimes the three methods agree, then other times, there is a normalization difference where NMR is larger or smaller than DIS.

At the end I show some slightly confusing ratio plots for polarization from DIS/NMR. Given this ratio is (PbPt/Pt), we should find a value ~0.84, or the beam polarization. I find only one epoch in spring where this is the case, and some other times the ratio appears to be the inverse being ~1.19, some different value, or even 1.

I presented these findings today during a meeting with Chris Keith, James Maxwell, and the AI Online-Polarization (AIOP) group. Chris and James mentioned that the differences between NMR and scattering might be explained by ice build-up; I added them to the thread so maybe they can provide a more detailed comment.

Once I have ironed out a few things, like correcting the dilution factor for epoch-to-epoch packing fraction changes and double-checking some details with the ND3 dilution factor, I'll make a wiki page for this extraction that is similar to Noémie's page.

Cheers,
Darren


________________________________
From: silvia via Rgc_analysis <rgc_analysis at jlab.org>
Sent: Monday, June 23, 2025 10:40 AM
To: Sebastian Kuhn <kuhn at jlab.org>
Cc: Rgc Analysis <rgc_analysis at jlab.org>; Rgc <rgc at jlab.org>
Subject: Re: [Rgc_analysis] RGC-analysis meeting tomorrow

Dear Sebastian,
thanks for reminding that, I had forgotten the JLUO meeting. I propose
the following: if anyone has any urgent matter to discuss, please let me
know in the next few hours, otherwise I'll cancel the meeting and we can
resume next week.
Best regards,
Silvia

On 2025-06-23 16:37, Sebastian Kuhn wrote:
> Since the JLUO meeting starts tomorrow at 9, l will likely not be able
> to attend
> Greetings - Sebastian
>
>> On Jun 23, 2025, at 10:22 AM, silvia via Rgc_analysis
>> <rgc_analysis at jlab.org> wrote:
>>
>> Dear all,
>> we'll have our RGC-analysis meeting tomorrow, Tuesday, at 8:30AM JLab
>> time, zoom link: https://jlab-org.zoomgov.com/j/1609368114 , wiki
>> page: https://clasweb.jlab.org/wiki/index.php/RGC_Jun24 .
>> Please let me know if you plan to present something.
>> Thanks!
>> Best regards,
>> Silvia
>> _______________________________________________
>> Rgc_analysis mailing list
>> Rgc_analysis at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/rgc_analysis
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