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["Fisyak, Yuri V" <fisyak AT bnl.gov>]

Hello,  it looks like that I found the reason for dE/dx degradation in mtd stream.

See  https://drupal.star.bnl.gov/STAR/system/files/Run%20XXII%20dEdx%20comparison%20st_physics%20and%20st_mtd%20%20stream_0.pdf

The conclusion is that we need trigger dependent dE/dx correction.

                                            Yuri Fisyak

STAR                             Phone: +1 631 344 3913
Brookhaven National Laboratory  Fax:    +1 631 344 4206
510A/1-161
http://www.star.bnl.gov/~fisyak       E-mail: fisyak AT bnl.gov

From: star-tpc-l-request AT lists.bnl.gov <star-tpc-l-request AT lists.bnl.gov> on behalf of Richard Witt <Star-tpc-l AT lists.bnl.gov>
Date: Thursday, November 20, 2025 at 12:29 PM
To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
Subject: [[Star-tpc-l] ] TPC Meeting Minutes

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Present: Alexei, Flemming, Jim, Yuri, Gene, Rongrong, and myself

== Hardware

— all is going well for the most part

— was small hiccup with laser (prior repair work appears to be holding)

— current concentration seems to provide as stable 5.52 cm/us drift velocity

— cathode interlock is now behaving

== Electronics

— still the usual losses and repairs of RDOs and FEEs (usual 15% dead on average)

— lost 5 or 6 RDOs in last five days, most were fixed yesterday

— Gene reminded us that due to SL farm outage coming on Monday and Tuesday there will be a delay in fast offline processing

== Software

— hit error work for AuAu23 DAQ 5000 (2023) with different fields (RF, RHF, and ZF)

— see https://drupal.star.bnl.gov/STAR/event/2025/11/20/Weekly-TPC-Meeting

— Run23 dE/dx in physics and MTD streams

— see https://drupal.star.bnl.gov/STAR/event/2025/11/20/Weekly-TPC-Meeting

— MTD stream data presents ~1% difference in dE/dx MIP position

— seems to be attributable to the inner sectors, but not yet fully understood

— Rongrong suggest looking at shift vs. RefMult due to central bias of MTD trigger

== AOB

— Nothing new for this week.

Best Regards,

  Richard

Sent from my iPad

-- 
"Education is the most powerful weapon which you can use to change
the world."

--Nelson Mandela

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 Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
    United States Naval Academy         Email: witt AT usna.edu
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