Star-tpc-l mailing list

["Van Buren, Gene" <gene AT bnl.gov>]

Frank asked me to forward my response to the TPC group.

-Gene

Begin forwarded message:

From: "Van Buren, Gene" <gene AT bnl.gov>

Subject: Re: [[Star-scmgt-l] ] new TPC alignment: comparison of dev and SL24y // Fwd: [star-bnl/star-sw] 💥DO NOT MERGE💥 ❗ add new TPC alignment, hit errors and slewing corrections for 2024 (PR #702)

Date: September 17, 2024 at 2:47:39 PM EDT

Hi, all

I appreciate that Yuri performed this comparison and summarized it...

Yuri's summary highlights changes in tracking ("hit sharing"). I believe that to be an important topic, worthy of further understanding (and I'm certain some time was spent on this in 2016 when StiCA was integrated, and that history should be understood). It is unclear to me why it is a component in this PR for TPC alignment.

As that dominates the track-by-track comparison, we're left with the TPC hit-by-hit comparison. I guess we take Yuri's word on not being concerned about the prompt TPC hits. And I might interpret the differences in the drifting TPC hits to mean that the same alignment is applied for this old data, but with different math in the code (??), and that the RMS of ~0.00016 cm in x & y represents an uncertainty due to rounding differences in the different math (though I guess those math calculations don't apply in z as there is no difference in z at all for the drifting hits).

Regarding the new alignment's chain option "CorrZ" (to be applied to iTPC era data), my understanding is that the TPC group may not yet have seen justification for Yuri's choice of TPC distortion corrections, but I welcome being corrected on that point.

Thanks,
-Gene

On Sep 17, 2024, at 1:31 PM, Frank Geurts <geurts AT rice.edu> wrote:

Begin forwarded message:

From: Yuri Fisyak <notifications AT github.com>
Subject: Re: [star-bnl/star-sw] 💥DO NOT MERGE💥 ❗ add new TPC alignment, hit errors and slewing corrections for 2024 (PR #702)
Date: September 17, 2024 at 11:11:47 AM CDT
To: star-bnl/star-sw <star-sw AT noreply.github.com>
Cc: Frank Geurts <geurts AT rice.edu>, Mention <mention AT noreply.github.com>
Reply-To: star-bnl/star-sw <reply+AEMNVR6WCIQT56DWSN3VFBWE6WFUHEVBNHHJEYYC7A AT reply.github.com>


I have posted comparison of dev and SL24y productions to answer the question on the effect of code modification on production of old (before iTPC) data with old chains.
https://drupal.star.bnl.gov/STAR/blog/fisyak/Track-track-and-hit-hit-analyses-dev-and-SL24y-Alignment2024-AuAu2002016-sample

I don't see any show stoppers to start the calibration production with SL24l for all fixed target samples from 2019-2021 with new alignment (CorrZ).

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