STAR HardProbes PWG

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

Hi Nihar,

Thanks for the questions. I will try to answer them in this email.

1) Yes, I'm using PYTHIA+GEANT's mistagged distributions for this subtraction. I have checked the mistagged distributions in HERWIG+fast sim as well (slide 20), and they are consistent with PYTHIA's. I added a slide for comparison between data and PYTHIA+GEANT on slide 27 at https://drupal.star.bnl.gov/STAR/system/files/pwg_meeting_081023_updated_0813.pdf.

2) The rc observable has a bias from the jet patch trigger below jet pT of 20 GeV. In simulations, we can choose whether to implement the JP trigger or not, and look at the corresponding truth jets that are matched to the reconstructed jets. This can be seen from the second plot on slide 24, where the truth jet population below 20 GeV is affected by the trigger. We therefore decided to not report results below 20 GeV to avoid potential bias introduced by the trigger. This lower jet pT cutoff is also consistent with the lower jet pT cutoff in the other jet substructure measurements (such as the jet mass analysis by Isaac, the jet charge analysis by Grant, and the SD analyses by Monika).

3) Right now the binning in 30-40 GeV is limited by the statistical uncertainty of the embedding that is used for mistagged subtraction. I will look into the finer binning once we have the higher statistics embedding fully setup.

Please let me know if these sound reasonable and/or if you have any other suggestions/followup!

Best,

Youqi

On Fri, Aug 11, 2023 at 2:56 AM Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Youqi,

Thank you for your nice study.
I was going through your correction procedure.

a few follow up questions:

1) On slide8:
https://drupal.star.bnl.gov/STAR/system/files/pwg_meeting_081023_new_0.pdf
As you are using PYTHIA models to subtract mistagged jet contribution
which is a model dependent way, Could you please show the following
results to validate "Mistagged (fake) subtraction" procedure?

It is important to show the comparison between each component of your rc
observables of data and that in PYTHIA+GEANt simulation.
Like N_ss, N_os, and Jet pT dist. of data vs PYTHIA+GEANT.

2) Can you please show your rc results at lower Full Jet pT range? For
example below jet pT < 20 GeV/c.  5 to 20 GeV/c range.

3) and is it possible to make your jet pT bins size a bit smaller, for
example, 30-35 and 35-40 instead of 30-40 GeV/c. To know if there is any
change in shape.

Thank you
Nihar





On 2023-08-09 23:03, Youqi Song wrote:
> Hi all,
>
> Please find my slides for tomorrow's meeting here:
> https://drupal.star.bnl.gov/STAR/blog/youqi/pwgmeeting081023-0
>
> Best,
> Youqi
>
> On Wed, Aug 9, 2023 at 12:43 PM Brennan Schaefer via Star-hp-l
> <star-hp-l AT lists.bnl.gov> wrote:
>
>> Hi Nihar, et al,
>>
>> I would like to show some embedding QA results tomorrow.
>>
>> thanks,
>>
>> b
>>
>> Brennan Schaefer
>>
>> On Tue, Aug 8, 2023 at 4:07 AM Nihar Sahoo via Star-hp-l
>> <star-hp-l AT lists.bnl.gov> wrote:
>>
>>> Hello All,
>>>
>>> We will have our HP-pwg meeting this Thursday (10th Aug) at 10 AM
>>> EDT.
>>> Let us know please if you want to present and discuss your
>>> analysis or
>>> any other business.
>>> Send your presentation slides a few hrs before the meeting,
>>> please.
>>>
>>> As QM2023 deadline is approaching, we request all PAs to update us
>>> your
>>> status for your presentation/poster.
>>>
>>> HP working group weekly meeting info:
>>>
>>
> https://drupal.star.bnl.gov/STAR/pwg/Hard-Probes/Weekly-HP-PWG-meeting
>>>
>>> Join ZoomGov Meeting
>>>
>>
> https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09
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>>>
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>>>
>>> Regards,
>>> Isaac, Yi and Nihar
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