STAR QA Board

[Daniel A Cebra <dacebra@ucdavis.edu>]

Hi Lanny (and Larisa), Thanks so much for this QA report. There are several QA issues that we are trying to resolve with the current FXT run (which started Wednesday morning). The eTOF data, which seem scrambled, do not have the required calibrations. 

ZjQcmQRYFpfptBannerStart

This Message Is From an External Sender

This message came from outside your organization.

 

ZjQcmQRYFpfptBannerEnd

Hi Lanny (and Larisa),

   Thanks so much for this QA report.  There are several QA issues that we are trying to resolve with the current FXT run (which started Wednesday morning).

The eTOF data, which seem scrambled, do not have the required calibrations. Yannick has done a fast calibration, and the spatial (local-Y) eTOF data are recoverable. I have yet to see his calibrated TOF plots, but I am optimistic that those will also be correctable.

The TPC dEdx gain issue is a bit of a concern. I have notified the TPC group and they are trying to understand the cause and the effect. This can be corrected by calibration, however if the mip peak falls, we can lose cluster resolution, so this could impact other performance issues, so it will be good to identify the cause.

The anomolies in TPC sectors 3 and 12 are a bit of a worry. I suspect that this is caused by the support services for the FST shadowing part of the TPC. This is a unique and poorly characterized FXT issue.

The overall poor TOF resolution is probably related to the low dEdx. The T0 for FXT uses minimum ionizing pions (which are well identified via dEdx) to then calculate a an Event-by-Event T0. With the low dEdx, particles that are not pions will fall into the pion window, and this will screw up the T0 calcuation. This will be fixed with a dEdx calibration.

I will ask the shift teams to address the hot channels in the BEMC when they have a chance.

The low number of good tracks is obviously a concern. Our hypothesis is that TPC drift velocity is a but different from the calibration value due the the methane content being off. A drift velocity mismatch will cause East side tracks to miss the main vertex and will break tracks across the central membrane. Alexei has increased the methane flow, so this should improve. Please keep watching these feature and look for them to improve.

The signed DCA issue is evidence of space charge build up. This can be corrected.

I need to look into the large fraction of missed vertices. I do not quite understand this point, but it sounds important.

Thanks so much!

Daniel

---

From: star-qaboard-l-request@lists.bnl.gov <star-qaboard-l-request@lists.bnl.gov> on behalf of Ray, Robert L <ray@physics.utexas.edu>
Sent: Friday, January 23, 2026 11:53 AM
To: star-qaboard-l@lists.bnl.gov <star-qaboard-l@lists.bnl.gov>
Subject: Re: [[STAR-QAboard] ] Fw: Weekly QA Board Meeting - 05/Dec/2025 at noon 12 EDT

 

Hi Ashik and QA Board members: Larisa has prepared a summary for the fast-offline QA FXT data from this week. I have posted her slides at: https: //drupal. star. bnl. gov/STAR/system/files/FastOfflineQA-Jan23-2026-LN. pdf Thanks, Lanny From: Arushi

ZjQcmQRYFpfptBannerStart

This Message Is From an External Sender

This message came from outside your organization.

 

ZjQcmQRYFpfptBannerEnd

Hi Ashik and QA Board members:

Larisa has prepared a summary for the fast-offline QA FXT

data from this week. I have posted her slides at:

https://drupal.star.bnl.gov/STAR/system/files/FastOfflineQA-Jan23-2026-LN.pdf

Thanks,

Lanny

---

From: Arushi Dhamija <arushidhamija507@gmail.com>
Sent: Friday, December 5, 2025 11:16 AM
To: Ray, Robert L <ray@physics.utexas.edu>; star-qaboard-l@lists.bnl.gov <star-qaboard-l@lists.bnl.gov>
Subject: Re: Fw: [[STAR-QAboard] ] Weekly QA Board Meeting - 05/Dec/2025 at noon 12 EDT

 

Dear All, 

Here is the drupal link for the slides discussed today in the QA Board Meeting (Dec 5, 2025).

https://drupal.star.bnl.gov/STAR/system/files/Fast_offline_qa.pdf

Thanks and regards

Arushi Dhamija

Department of Physics

Panjab University, Chandigarh, India

On Fri, 5 Dec 2025 at 22:24, Arushi Dhamija <arushidhamija507@gmail.com> wrote:

Dear All,

I would like to give a brief summary of the fast offline QA for this week (1-5 Dec). Kindly add me to the agenda. 

Here are the slides I would like to present.

Thanks and regards

Arushi Dhamija

Department of Physics

Panjab University, Chandigarh, India

On Fri, 5 Dec 2025 at 21:52, Ray, Robert L <ray@physics.utexas.edu> wrote:

---

From: star-qaboard-l-request@lists.bnl.gov <star-qaboard-l-request@lists.bnl.gov> on behalf of ASHIK IKBAL <ashikhep@gmail.com>
Sent: Thursday, December 4, 2025 6:14 PM
To: star-qaboard-l <star-qaboard-l@lists.bnl.gov>
Subject: [[STAR-QAboard] ] Weekly QA Board Meeting - 05/Dec/2025 at noon 12 EDT

 

Dear All, We will have our weekly QA board meeting this Friday (05/Dec/2025) at noon 12 EDT. Please let me know if you would like to present.   The agenda can be found here:  https: //drupal. star. bnl. gov/STAR/blog/ashik/QA-Board Zoom connection

ZjQcmQRYFpfptBannerStart

This Message Is From an External Sender

This message came from outside your organization.

 

ZjQcmQRYFpfptBannerEnd

Dear All,

We will have our weekly QA board meeting this Friday
(05/Dec/2025) at noon 12 EDT. Please let me know if you would like to present. 

The agenda can be found here: https://drupal.star.bnl.gov/STAR/blog/ashik/QA-Board

Zoom connection details:

Join ZoomGov Meeting

https://bnl.zoomgov.com/j/1618907709?pwd=YitQYzFUdWFYU1ppTjYxTjRYbDdsZz09

Meeting ID: 161 890 7709
Passcode: 775538

Thanks,

Ashik

--

Ashik Ikbal

Research Scientist

Kent State University

(stationed at Brookhaven National Laboratory)

Department Of Physics

Kent, OH 44242, USA

Contact no.s: +1 631-504-7647 (USA)

                      +91 8250216234 (India)

Alternate e-mails: asheikh2@kent.edu

                             ashik@rcf.rhic.bnl.gov

                             ashik.ikbal.sheikh@cern.ch

This message is from an external sender. Learn more about why this matters.

This message is from an external sender. Learn more about why this matters.