STAR QA Board

["Van Buren, Gene" <gene@bnl.gov>]

I looked at the 3 runs reported by Lanny on slide 3 as having sDCA oddities:

24171010: there was a jump in luminosity (as Flemming already noted) mid-run, 
so hopefully this will be appropriately corrected when a good SpaceCharge 
calibration is in place

24174005 and 24172014: no features in the RICH scalers, neither in the 
database nor in the DAQ files, so this was not the explanation....
...but I believe I understand nevertheless....
The histogram points where sDCA is ~-0.5 cm and error bars are small are from 
events within st_physics files. The histogram points where sDCA is closer to 
zero and spread about with larger errors are from events within 
st_physics_adc files. Those st_physics_adc files are missing their inner TPC 
sector hits, as Lanny also reported on slide 2. Without inner TPC hits on the 
tracks, they are much less well constrained and have e larger spread in their 
projection back to the primary vertex, which itself is also less well 
constrained by these shorter tracks. The result is a broader sDCA 
distribution whose mean is closer to zero.

So this effect is an artifact of the un-reconstructed inner TPC hits this 
past week from the offline cluster finder used for st_physics_adc files.

Thanks for catching this, Lanny. Hopefully the offline cluster reconstruction 
problem is resolved soon.

-Gene


> On Jun 23, 2023, at 11:42 AM, Ray, Robert L via STAR-QAboard-l 
> <star-qaboard-l@lists.bnl.gov> wrote:
> 
> Hi Ashik:
> 
> My presentation is now posted at:
> https://drupal.star.bnl.gov/STAR/system/files/FastOfflineQA_June23-2023_Ray.pdf
> Lanny
> From: STAR-QAboard-l <star-qaboard-l-bounces@lists.bnl.gov> on behalf of 
> ASHIK IKBAL via STAR-QAboard-l <star-qaboard-l@lists.bnl.gov>
> Sent: Thursday, June 22, 2023 11:37 AM
> To: star-qaboard-l@lists.bnl.gov <star-qaboard-l@lists.bnl.gov>
> Subject: [STAR-QAboard] Weekly QA Board Meeting - 23/June/2023 at noon 12 
> EDT
>  
> Dear All,
> 
>  We will have our weekly QA board meeting this Friday
> (23/June/2023) 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 Associate
> Kent State University
> 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
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