Star-tpc-l mailing list

[Zachary Sweger <zwsweger AT ucdavis.edu>]

A follow-up question regarding today's presentation. 

I checked the gMom variable in the picoDsts, and this is not 0 when the pMom variable is 0, so Yuri was right that pMom is just being set to 0 if a track is not flagged as a primary. My question now is why would a track with a lot of hits and a small DCA not be flagged as a primary? For example this track from event 1246798 and run 20183003:

primary_px = 0

primary_py = 0
primary_pz = 0
global_px = 0.333053
global_py = -0.714979
global_pz = -1.12554
lndedx = 0.934484
dcax = -0.198708
dcay = -0.0324152
dcaz = -0.038208
charge = 1
nhitsfit = 67
nhitsmax = 72
nhitsdedx = 64

Thank you!

Zach

On Thu, Jul 25, 2024 at 12:25 PM Zachary Sweger <zwsweger AT ucdavis.edu> wrote:

Hi all,

My edited slides from today are here: https://drupal.star.bnl.gov/STAR/system/files/24_07_25%20Update_v1.pdf

I added my analysis track cuts on slide 2. And I added the mean(mean(eta)) plot as a function of Vz on slide 21.

Best,

Zach

On Thu, Jul 25, 2024 at 9:54 AM Richard Witt <star-tpc-l AT lists.bnl.gov> wrote:

Present: Alexei, Gene, Jim, Zachary, Flemming, Mathias, Grazyna, Yuri, and myself

== Hardware

— things running well in general

— laser runs are good with the usual caveats

— methane flow was slightly increased in response to decrease in drift velocity over the past couple weeks

— crews likely won’t see the difference for at least a few days of operations

== Electronics

— nothing new to report

== Software

— Run 22 SC

— pass 3 has been started and is proceeding well

— good to have calorimeter fix for this pass

—  dE/dx is turned on for this pass (no event.root files, but dE/dx is there if someone want to look at it)

— may want to take one more look with new TPC alignment 

— Production with TFG24c

— some delays due to farm capacity and killed jobs (~1-2 week delay)

— have now increased number of jobs by factor of 4 by splitting files into chunks

— so far 5-20% of data sample has been processed

— Update on test production with new alignment (3.2 GeV FXT)

— see slides sent to list by Zachary

— several tracks in test production are assigned zero momentum

— seems to be event-by-event fluctuation not track-by-track

— some example events are Run 20183003, events 1264727 and 1246798

— most events are okay and match the P24ia production, but need to understand the root of the issue

== AOB

— nothing else new 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

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