STAR Flow, Chirality and Vorticity PWG

[cebra <cebra AT physics.ucdavis.edu>]

Hi Cameron,
   The 3.2 GeV FXT embedding request that I had submitted used and eta 
range from -2.4 to 0.0.
That embedding sample should cover the region about which you are 
concerned. Note that for the
high pT tracks we have never seen any change in tracking performance 
above 1.5 GeV, so it is really
not efficient use of embedding resources to embed to high pT. There 
ought to be another 3.2 GeV
proton embedding sample that have the full eta coverage.
   You are correct that the FXT acceptance extends beyond rapidity or 
eta of -2.0, and embedding requests
that do not cover the full acceptance of the TPC in FXT mode are not the 
best use of resources as they
will need to be redone with a complete coverage.

Regards, Daniel

On 2023-12-18 15:24, Cameron Racz via Star-fcv-l wrote:
> 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
>
>
>
>
>
>
>
>
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