Star-tpc-l mailing list

[Richard Witt <witt AT usna.edu>]

Present: Alexei, Jim, Yuri, Gene, Mathias, Emmy, Aihong, and myself

== Hardware

— current plan is to go forward with destructive decommissioning (TPC and others)

— gas shifts expected to start March 11th

== Electronics

— Tonko says west side is done (all working)

— needs a couple more weeks for repairs on east side 

== Software

— Emmy’s work on mass differences

— see

— looked at vertical tracks now (eta < 0.1) 

— very little pt dependence

— some small, maybe 3rd order, polynomial behavior with Vz

— will try once more with pileup removal, and perhaps multiplicity dependence

— Yuri mentions that because we know current distortion (sag), we can use correction to correct Emmy’s 2019 data

— see Yuri’s blog; TPC alignment, alignment by sector (alpha, beta, gamma)

— Yuri points out that new alignment model uses circular assumption for OFC along z

— but we know about sag, so near membrane their should be an additional term

— Addressing difference in dE/dx observed for 19GeV_2019 using MySQL and CINT tables. 

— problem has been found

— requires disactivating two older calibration, problem has been fixed.

— dE/dx 3p85GeV_fixedTarget_2021 calibration has been done, 

— put in MySQL, and now MySQL version of calibration table has been verified with TFG on AL92 

— unknown how to run SL24iy on Alma Linux as of yet

— KFParticle without Vc has been released by Maksym Zyzak on 12/16/24

— this version has been put in star-sw as PR#722 3 weeks ago (https://github.com/star-bnl/star-sw/pull/722):

— KFParticle was introduced in STAR libraries 14 years ago (Thu Apr 15 22:49:12 2010 )

— based on old Vc (0.4) library version.

— new development in KFParticle was based on the latest version of Vc (0.7+) 

— does not compile with old Vc with standard STAR library

— Almost 50% of strange particle and all charm and hypernuclei analyses are based on upgraded versions of KFParticle

— different TFG release and private Maksym’s codes

— FIAS group (M.Zyzak and Co) has promised to provide KFParticle without Vc library, based only on include files.

— This version should allow to standardize KFParticle based analyses.

— Mathias claims (Slide 14, - Presentation from Mathias Labonte) that hard coded dead region due to Gating Grid creates a problem with matching embedding and data near gating Grid. 

— Requires fix in TPC geometry (eliminate dead region due to Gating Grid).  

— Jason has removed the hard coded dead regions from TPC geometry (https://github.com/star-bnl/star-sw/pull/723)

— There are some claims that BTof alignment has problem for fixed target. (https://drupal.star.bnl.gov/STAR/system/files/QualityAssuranceFor3p9GEV.pdf). 

— Gene talked about this (https://drupal.star.bnl.gov/STAR/event/2025/01/15/SC-Management-Meeting) yesterday. 

— P Pbar Tof mass splitting for 19GeV_2019 is still questionable.

— Yuri believes, that for daq5k (2022-2025) data sample GMT information will be very valuable. 

— GMT code provide by Grigory & Co. does not have GMT information propagated to the level of (Mu|Pico)Dst. 

— This information has to be added. Yuri is working on this.

— SC calibration for beam-beam data in BES-II

— this is to check calibration with new TPC alignment in place

— Run22 pp500 calibration production is being worked on to produce a sample for Yuri

== AOB

— Nothing additional reported 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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