STAR HardProbes PWG

[Youqi Song <youqi.song AT yale.edu>]

Hi Nihar, all,

I uploaded some more slides here: https://drupal.star.bnl.gov/STAR/system/files/pwg_meeting_082223_followup.pdf

I didn't do any unfolding using a 2D response matrix. The reweighting procedure essentially does the same thing, since the matching between Pythia and Pythia+Geant also encodes the information about the pT distribution of the truth given a reconstructed pT range. Please see slide 2 of my new slides for more details on how this is done.

I am also now using a different formula to find the statistical uncertainty of weighted distributions, which results in a slight decrease in the statistical uncertainty for the measurement. However, there is no change in the central values. The details of this are also in the slides.

The last slide has the figure that I would like to put the preliminary stamp on, with statistical and systematic uncertainties included.

Best,

Youqi

On Wed, Aug 23, 2023 at 7:15 AM Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Youqi,

Sorry, I could not concentrate on your presentation yesterday, for me it
was too late.

I went through your presentation today.
Could you answer the following questions from your your slide?

SLide6-7:
you try to correct  reco-pT to true pT correction based on JES.
On slide-7 lower right plot, "data after mistagged subtraction and pT
correction" are plotted on the same binning "data after mistagged
subtraction". I was expecting it will only change your x-axis for
pT-correction. What am I missing here?

And also it is not clear how do you perform this correction. Could you
give a try to explain me?


General comment:
Not sure, if you are correcting your rc vs. jet pT results using
unfolding by creating 2D response matrix using.
For example, Pythia and Pythia+Geant simulation.
Or have you  tried that way?

Cheers
Nihar





On 2023-08-22 21:34, Youqi Song via Star-hp-l wrote:
> Hi all,
>
> Please find my slides for the PWG meeting presentation here:
> https://drupal.star.bnl.gov/STAR/system/files/prelim_request_082223.pdf.
> I will update the error bars for systematic and statistical
> uncertainty as suggested and upload a new version later.
>
> Best,
> Youqi
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