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Re: [[Star-tpc-l] ] Some TPC performance issues in the current run

From: "Van Buren, Gene" <gene AT bnl.gov>
To: "Van Buren, Gene" <gene AT bnl.gov>
Cc: Star-tpc L <Star-tpc-l AT lists.bnl.gov>, Daniel A Cebra <dacebra AT ucdavis.edu>
Subject: Re: [[Star-tpc-l] ] Some TPC performance issues in the current run
Date: Thu, 22 Jan 2026 17:45:04 +0000

One more plot from FastOffline. This is the DCA in z of the global partner of primary tracks (horizontal axis) which point to a vertex at z = +200 cm, versus eta of the tracks (vertical axis). Things look pretty good here, though there may be a hint of DCA z being a little left of zero for west-side tracks (-1 < eta < 0), and a little right of zero for tracks that cross into the east TPC (-2.5 < eta < -1, which are the majority of the tracks). That difference could perhaps be due to small but uncalibrated SpaceCharge distortion corrections at this time.

-Gene

[[Star-tpc-l] ] Some TPC performance issues in the current run, Daniel A Cebra, 01/22/2026
- Re: [[Star-tpc-l] ] Some TPC performance issues in the current run, videbaek, 01/22/2026
  - Re: [[Star-tpc-l] ] Some TPC performance issues in the current run, Van Buren, Gene, 01/22/2026
    - Re: [[Star-tpc-l] ] Some TPC performance issues in the current run, Van Buren, Gene, 01/22/2026