STAR HardProbes PWG

[Tong Liu <tong.liu AT yale.edu>]

Hi all,

Please find my updates slides in the link below: https://drupal.star.bnl.gov/STAR/system/files/HP_pwg_0922_0.pdf

The Isobar vs Au+Au plot is on slide 16. I'll follow up with more pythia MPI studies later.

Tong Liu

Ph.D. Student '2023 

Physics Dept., Yale University

Tel: 203-435-2130

On Fri, Sep 23, 2022 at 11:00 AM Youqi Song via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi all,

I have updated my slides for the preliminary request at: https://drupal.star.bnl.gov/STAR/system/files/prelim_request_092222_0.pdf.

A few things that I would like to point out:

Regarding systematics,

- You might have noticed that the systematic errors for multifold have gone up by a bit. This is because I realized that before, when doing herwig and pythia8 shape variations, I was using pythia6 mass distribution for the misses. Now I changed it so that the misses contribution for prior shape variation is also weighted by the mass ratio of herwig (pythia8) over pythia6.

- After talking with Isaac, I learned that unfolding systematics due to variation of iteration number and variation of prior shape were treated as correlated in previous analyses, while I originally had these added in quadrature. Now I also treat them as correlated by just taking the largest contribution to the unfolding systematic as the overall unfolding systematic, and add it in quadrature with detector systematics.

- Regarding the question whether there's anything still missing that's raised during the meeting yesterday, I forgot to mention that we haven't included detector and generator level pT shape smearing. This is included in Raghav's and Isaac's analyses because they did 1D reweighting, but we are not sure if it should be included for multidimensional unfolding.

Regarding plotting,

- For fig. 1, I made the mass distribution plot with the same data points in 4 different styles.

- For fig. 1 ratio plot, the error band is now centered at 1 and is the quadrature of RooUnfold's and MultiFold's unfolding systematics, divided by the mean values from RooUnfold.

- For fig. 2, I also included a plot of the M vs Q correlation with raw data before unfolding.

- For fig. 3, I have pythia8 curves plotted together with my unfolded mass distributions.

Please let me know if you have any comments/suggestions.

Best,

Youqi

On Wed, Sep 21, 2022 at 5:47 PM Youqi Song <youqi.song AT yale.edu> wrote:

Hi all,

I have uploaded my slides here: https://drupal.star.bnl.gov/STAR/blog/youqi/multifold092222

Best,

Youqi

On Wed, Sep 21, 2022 at 5:04 PM Tong Liu via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi all,

Please find my pdf in this post:

https://drupal.star.bnl.gov/STAR/blog/tongliu/Tong-Lius-HP-PWG-updates

Tong Liu

Ph.D. Student '2023 

Physics Dept., Yale University

Tel: 203-435-2130

On Wed, Sep 21, 2022 at 3:29 AM Nihar Sahoo via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hello All,

We got requests from Youqi and Tong to present their results for the Hot
Quark conference.
And during Youqi's talk at the collaboration meeting, we did not get
time to have Q&A.
So let's meet this week to discuss their updates.

Youqi and Tong, can you please send link of your slides in this thread
again?
(I didn't get your previous emails, the reason I do not know)

If anybody wants to discuss their results, please let us know.


HP-pwg weekly meeting Drupal page:
https://drupal.star.bnl.gov/STAR/pwg/Hard-Probes/Weekly-HP-PWG-meeting

Zoom Meeting link:
https://bnl.zoomgov.com/j/1611419615?pwd=VW1hNm43ZDd5d2EvK2R4aEJsQ2ZNZz09

Meeting ID: 161 141 9615
Passcode: 744968


Thank you
Barbara, Yi, Sooraj, Nihar



On 2022-09-19 22:13, Nihar Sahoo via Star-hp-l wrote:
> Hello All,
>
> Last week we discussed a lot at the collaboration meeting, If there is
> no urgent matter to discuss,  let's cancel this week's HP pwg meeting.
>
> Have a great week.
>
> Thank you
> Barbara, Yi, Sooraj, and Nihar
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> Star-hp-l AT lists.bnl.gov
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