STAR QA Board

["Ting Lin" <tinglin@sdu.edu.cn>]

Hi all:

A brief minutes for today's meeting:
https://drupal.star.bnl.gov/STAR/comp/qa/pwg-qa/run-22-qa

For Run-22 offline QA:
>From Lanny Ray:
Single run issue:
  1. Run 23049049 decreased number of hits in mid-section of Sector 8, RDO 7
  2. Run 23052056 iTPC sector 13, number of hits very low; ADCs low.
  3. Run 23053023 st_fwd and st_physics data streams, the dE/dx mean is much 
too high and the ionization energy band resolution is very poor.
  4. Run 23055041, Run with problematic Scalar. Gene investigated and 
determined that the absence of RICH scalers in the first part of this run 
prevented TPC distortion corrections from being calculated and caused those 
st_physics files analyzed by fastoffline QA to fail. The files used for 
st_fwd QA did have RICH scalers and produced normal QA histograms. These QA 
analyzed files were taken at about 1000 s into the run.  Gene recommends that 
the first part of this run, without RICH scaler information, be marked BAD, 
but the rest are good.

Some general issues:
   Tracking: 
      Starting last week the QA shift crew (Leszek) noticed that the 
distribution of the number of primary tracks was starting to decrease. Gene 
constructed a plot showing the trends. This plot confirms Leszek’s 
observation. The degradation in primary track yield appears in MB, HT and 
st_fwd XX trigger groups in the QA (see QA issue 18109).

   Vertex Z:
      Primary vertex z-distribution: We checked the fast-offline QA for the 
dip in PV distributions at z=0 and found that it goes back as far as the QA 
is still available, about 2 weeks to 20 days. It appears in MB, HT and XX. 
The MB case was hard to recognize because the usual st_physics stream has 
very few triggers and PVs in the plots. 
      We note that the global track DCA distributions are broad (from -200 to 
+200 cm) and peaked near z = 0 as expected, even when the PV distributions 
dip at z=0.
      Interestingly yesterday’s runs 23055064, 065 with very low ZDC/EPD 
rates, where sTGC settings were being tested, show normal looking PV 
distributions.

>From different PWG groups:
   1. 23050020-> is laser run, after loss beam. Not any thing physics. 
   2. Continue to see strange multi-peak Vz distributions; located at +-50cm. 
Also see this from the hlt monitor trigger. Need to ask experts about the 
real issues.
   3. We see TPC Vz - VPD Vz = 10cm from HF with 45cm vertex cut; TPC Vz - 
VPD Vz = 5cm from BulkCorr without vertex cut.

Best,
Ting

> -----Original Messages-----
> From: "Ting Lin" <tinglin@sdu.edu.cn>
> Sent Time: 2022-02-24 16:26:37 (Thursday)
> To: "star-qaboard-l@lists.bnl.gov" <star-qaboard-l@lists.bnl.gov>
> Cc: 
> Subject: QA Board Meeting Feb. 25
> 
> Hi all:
> 
> We will have a QA board meeting on Friday at noon BNL time, 
> https://drupal.star.bnl.gov/STAR/comp/qa/pwg-qa/run-22-qa
> 
> If you have slides to show, please link to the meeting page (in below link) 
> or send it to me.
> https://drupal.star.bnl.gov/STAR/event/2022/02/25/QA-Board-Meeting
> 
> Join ZoomGov Meeting:
> https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1618435669?pwd=L3B6M3JKcjRFMVFxQTNhaEdBdkZ5UT09__;!!P4SdNyxKAPE!Ua8K6sAQcwo75WM_dnXIW61jfKy68xgkqQVJtZvu22BXzYYEjElCgdWOnKmKr6GjSI3F0tLdzmQ$
>  
> Meeting ID: 161 843 5669
> Passcode: 194299
> 
> Thanks.
> Ting