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Subject: STAR task force for evaluating tracking efficiency uncertainty

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  • From: Dmitry Kalinkin <dkalinkin AT bnl.gov>
  • To: Robert Líčeník <licenik AT ujf.cas.cz>, "STAR task force for evaluating tracking efficiency uncertainty" <star-tf-trkeff-l AT lists.bnl.gov>
  • Subject: Re: [Star-tf-trkeff-l] Update - pp2012 production and embedding
  • Date: Fri, 11 Jun 2021 23:09:35 -0400


Robert Líčeník via Star-tf-trkeff-l writes:

> Hi everyone,
>
> thanks to Petr, who produced MuDsts and picoDsts from daq files in both
> SL12d_embed and SL13b_embed libraries, we can now conclude that the
> differences between the official production and the production done by
> Dmitry (and used for embedding in his study) is very likely due to the
> difference between the two libraries. See attached slides for the
> comparison plots. For simplicity, black and green points are from
> SL12d(_embed) and other points are from SL13b_embed.
> Would anyone happen to remember what changed between these two libraries
> that might cause such a large difference in refmult and other track-related
> quantities?
>
> Thanks,
> Robert
> _______________________________________________
> Star-tf-trkeff-l mailing list
> Star-tf-trkeff-l AT lists.bnl.gov
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Hi Robert,

I think I know the answer to this question. There is a difference in the
PPV vertex finder in SL13b that was introduced for run12pp510
production. I think it was called "W boosting", and the scope of the
change was just to change the default parameters (like NHits/NHitsPoss
cut) of PPV to boost vertex the finding efficiency. You can browse the
relevant differences yourself:

diff -r
/afs/rhic.bnl.gov/star/packages/SL{12d,13b}_embed/StRoot/StGenericVertexMaker

There may be other differences between the libraries, after all, experts
have unrestricted ability to tweak things in the core codes.

In my early steps I was also trying to understand what was the practical
difference between SL12d(pp200 data)/SL13b(pp510 data) and
SL13b_embed(what is available). I've looked at the event by event
differences of multiplicies of global and primary tracks. See slide 4 of
https://drupal.star.bnl.gov/STAR/system/files/iu_local_meeting_2018_11_08.pdf
I'm not sure if that contradicts your findings.

Best,
Dmitry




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