[Rgc_analysis] hwp swap for run 17555

[Christopher Dilks]

Dear Noémie,

Derek Holmberg and I are starting the QADB for these data today; please let us know if this run (or any other runs) gets re-cooked.

In any case, if the HWP is indeed wrong for a run, the QADB will flag it automatically since it checks the SIDIS pi+ beam-spin asymmetry sign.

Thanks,
Chris


Christopher Dilks

Jefferson Lab Staff Scientist

Office: B122

Phone: 757-269-7750

Email: dilks at jlab.org

________________________________
From: pilleux via Rgc_analysis <rgc_analysis at jlab.org>
Sent: Tuesday, June 3, 2025 11:09
To: Rgc Analysis <Rgc_analysis at jlab.org>
Subject: [Rgc_analysis] hwp swap for run 17555

Dear all,
The HWP status for run 17555 in CCDB is OUT, but it should be IN
according to the logbook:
https://logbooks.jlab.org/entry/4129580
https://logbooks.jlab.org/entry/4129628

This may be why the target polarisation result for ND3- is lower, I will
need to update the results that are on the wiki page (both for NH3 and
ND3) with the proper HWP swaps for the spring23 period.

When CCDB is updated and the previous NH3 runs that was flagged is
cooked again, it would be worth it to cook run 17555 as well probably.

Best, Noémie.
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