STAR Flow, Chirality and Vorticity PWG

[Cameron Racz <cracz001 AT ucr.edu>]

Hello convenors,

I was recently doing some work on how I apply the 3.2 GeV FXT TPC efficiency 
values to my analyses at 3.5, 3.9, and 4.5 GeV (since that was the plan I 
knew of since Quark Matter) and I noticed that the embedding does not fully 
cover the TPC in rapidity. I am using embedding ID 20221601 
(https://drupal.star.bnl.gov/STAR/starsimrequests/2022/Apr/23/FXT-AuAu-32-GeV-2019-proton)

I have attached here a 2D plot I made that shows all of the protons I have 
that DON’T match up to a TPC efficiency. Essentially, the empty region that 
has been cut out is the embedding/efficiency region. I was concerned about 
the yellow band at low pT in rapidity between -0.8 and 0 since all of those 
protons are being thrown out with no efficiencies.

I think this comes from the fact that the embedding used "-2 < rapidity < 0 
(LAB rapidity)” when the actual eta distribution of the TPC at 3.2 extends a 
little past -2.0 (I also attach here a picture of an eta distribution of all 
the good TPC tracks I found in my analysis).

I just wanted to bring this to your attention in case it was an unknown 
issue. Is there a way that this could be fixed, or are there other embeddings 
planned that would sort of overwrite this one and fix this issue soon?

Thank you,

Cameron Racz
Ph.D. Candidate 
Heavy-ion Physics Group
University of California, Riverside