STAR HardProbes PWG

["Ma, Rongrong" <marr AT bnl.gov>]

Hello Neil

Thanks for your responses. However, I still do not fully understand. 

1. Let's just focus on jet pT measurement, and forget about z-spectra. You have three priors: PYTHIA, FONLL and DataWeighted. On slide 11, one sees that FONLL is quite close to DataWeighted, and both of them deviate from PYTHIA. Then on slide 12, the unfolded spectra are very similar for using PYTHIA and FONLL as priors, but the one using DataWeight as the prior could deviate as large as more than 100% in peripheral events. Do you understand why? In your response, you mentioned "measured distribution also changes for the data-weighted distribution in comparison to PYTHIA+FONLL". It is not clear why measured distribution (data) would change when the prior is changed.

2. For the ratio plots (R_CP), you should either add the uncertainties from central and peripheral events in quadrature if they are uncorrelated, or directly assess the uncertainty on the ratio if they are correlated. Which method do you use now? If the latter, is the very small uncertainty on the ratio due to the cancellation of the uncertainties from central and peripheral events? What is the percentage error on the ratio? If this is true, it is a remarkable statement that we can control the unfolding uncertainty on jet measurement to such a level. I know it is on the ratio, but still. 

Best

Rongrong

On Aug 16, 2023, at 3:05 PM, Diptanil Roy <roydiptanil AT gmail.com> wrote:

Hi Rongrong, please find some replies below:

1. Do you understand why the spectrum shape for "Data Weighted" is closer to FONLL than PYTHIA (slide 12) but variations in unfolded results are so much larger than PYTHIA (slide 13)?

• A. The spectrum shape for 'Data Weighted' is on top of PYTHIA weighted with FONLL. 
• The jet pt spectra are quite similar in the 5-20 GeV range. The lower end of the z-spectra is where we see some differences between data weighted and PYTHIA/FONLL. 
• The measured distribution also changes for the data-weighted distribution in comparison to PYTHIA+FONLL. I think these changes together compound the variation we see.
  
• Apart from that, the weights derived by dividing a 2D distribution of Data and GEANT. Data distributions have significantly low statistics, so there are some bin-by-bin fluctuations we end up with. For example, in Slide 10, if you look at the comparisons between Jet pT between GEANT and Data, you can see some differences even after reweighting.

2. With the update, the systematic uncertainties become very small, e.g. low pt on slide 30. Why is this the case?

• This is only true for the ratio plots.
• Yes, that's true for some bins. That is because of the changes that were suggested for the error calc. 
  
• I am now choosing the upper and lower limit of variation of the RCP due to 1) iteration parameter changes 2) prior changes.
• In the previous version, I wanted to choose the maximum variation in spectra (between central and peripheral), and propagate it all the way to the RCP. I had a small mistake in the code where I was always choosing the systematic unc. in the central spectra. That has now been fixed.

Please let me know if you have any further questions.

On Wed, Aug 16, 2023 at 1:16 PM Ma, Rongrong <marr AT bnl.gov> wrote:

Hello Neil 

Do you understand why the spectrum shape for "Data Weighted" is closer to FONLL than PYTHIA (slide 12) but variations in unfolded results are so much larger than PYTHIA (slide 13)?

With the update, the systematic uncertainties become very small, e.g. low pt on slide 30. Why is this the case?

Thanks. 

Best

Rongrong

On Aug 16, 2023, at 12:22 PM, Diptanil Roy via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi everyone, I have implemented the changes recommended yesterday in the PWG meeting. Please find the updated presentation here. https://drupal.star.bnl.gov/STAR/system/files/HardProbes_Aug10_Diptanil_v3.pdf

Here are some comments below:

1. Slide 11: I added the generated level input plots for PYTHIA+FONLL distribution weighed by the data. They are shown in black.

2. Slides 27-38: I have added the new plots with the updates. Slide 26 summarises the updates. I have retained the old plots just in case you wanted to compare them. For eg: Slide 27 has the jet pT spectra that I showed yesterday. Slide 28 has the jet pT spectra after I moved the central value to the mean of the prior variation.

3. Slides 39-44: I have the plots compared to available theory predictions. I have added the prediction for peripheral events spectra in D0 pT 1-10 GeV, and all the spectra in D0 pT 4-10 GeV.

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

Cheers,

On Tue, Aug 15, 2023 at 10:35 AM Diptanil Roy <roydiptanil AT gmail.com> wrote:

Hi everyone, please find my contribution from today. https://drupal.star.bnl.gov/STAR/system/files/HardProbes_Aug10_Diptanil_v2.pdf

Thank you for your comments.

Cheers,

On Tue, Aug 15, 2023 at 7:50 AM Barbara Trzeciak via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Thanks Jakub for the quick update.

Unfortunately, I won't be able to connect today for your presentation. 

Will check the discussion from the recording and let you know in case of further questions. 

Cheers,

Barbara

On Tue, Aug 15, 2023 at 1:09 PM Ceska, Jakub via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear Barbara,

thank you for your comments. Please find and updated version of the presentation (same link, https://drupal.star.bnl.gov/STAR/blog/ceskajak/HP-PWG-meeting-150823).

The pT bin fits (slides 24-29) are the first approach and can definitely be improved. The 0-2 GeV/c bin would need a different background shape, as the exponential does not work here). The plots show a comparison of fits with Leszek's constraints (left) and with larger, arbitrarily chosen constraints (right). Again, relaxing the constraints improves the accuracy of the signal fit.

The constrained values used previously and the current values can be found again on slides 22 and 23. The fit does not seem to succeed for any unbound signal width and tends to grow to unexpectedly large values of sigma. The upper constraint of 0.3 was chosen arbitrarily.

Best regards,
Jakub

---

Od: Barbara Trzeciak <barbara.trzeciak AT gmail.com>
Odesláno: úterý 15. srpna 2023 11:04
Komu: STAR HardProbes PWG <star-hp-l AT lists.bnl.gov>
Kopie: Ceska, Jakub <jakub.ceska AT fjfi.cvut.cz>
Předmět: Re: [Star-hp-l] HP-pwg meeting 10 AM BNL time, 10th Aug 2023

 

Hi Jakub,

thanks for the update. It looks like the peaks are wider. If it's quick, can you do the same exercise for Upsilon signal divided in Upsilon pT bins ? 

It would be useful to add comparison of  numerical values between the previous constraint from Leszek fit parameters (mean and width) and the ones that your new fit prefers. 

And it would be good to see in more detail what happens with the signal's width for J/psi in Brennan's analysis. 

Cheers,

Barbara

On Tue, Aug 15, 2023 at 10:44 AM Ceska, Jakub via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear Barbara,

thank you for your comments. I have tried relaxing the widths (and the means) of the CB functions. This appears to cover the signal better. Please see slides 22 and 23 in the attached presentation: https://drupal.star.bnl.gov/STAR/blog/ceskajak/HP-PWG-meeting-150823

As for the embedding, I am working on it, but have no results yet.

Best regards,
Jakub

---

Od: Barbara Trzeciak <barbara.trzeciak AT gmail.com>
Odesláno: pátek 11. srpna 2023 12:49
Komu: STAR HardProbes PWG <star-hp-l AT lists.bnl.gov>
Kopie: Ceska, Jakub <jakub.ceska AT fjfi.cvut.cz>
Předmět: Re: [Star-hp-l] HP-pwg meeting 10 AM BNL time, 10th Aug 2023

 

Hi Jakub,

thanks for the update on the fitting.

Looking at your slide 20, it seems that this left tail is part of the signal. Could you please check what happens if you make looser constraints to your Upsilon signal width.

Also, have you had a chance to look at the embedding to see if you get such a wide signal there ? 

Cheers,

Barbara

On Thu, Aug 10, 2023 at 2:11 PM Ceska, Jakub via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear all,

please find my slides attached:
https://drupal.star.bnl.gov/STAR/blog/ceskajak/HP-PWG-meeting-100823

Best,
Jakub

---

Od: Star-hp-l <star-hp-l-bounces AT lists.bnl.gov> za uživatele Ceska, Jakub via Star-hp-l <star-hp-l AT lists.bnl.gov>
Odesláno: středa 9. srpna 2023 18:02
Komu: STAR HardProbes PWG <star-hp-l AT lists.bnl.gov>
Kopie: Ceska, Jakub <jakub.ceska AT fjfi.cvut.cz>
Předmět: Re: [Star-hp-l] HP-pwg meeting 10 AM BNL time, 10th Aug 2023

 

Dear all,

I will report on the questions raised last week and present an update on the status of the analysis of the Run17 Upsilons.

If possible, I would like to present at the beginning of the meeting, as I will need to leave by 12 EDT.

Best,

Jakub

---

From: Star-hp-l <star-hp-l-bounces AT lists.bnl.gov> on behalf of 张炜 via Star-hp-l <star-hp-l AT lists.bnl.gov>
Sent: Wednesday, August 9, 2023 3:47:06 PM
To: STAR HardProbes PWG <star-hp-l AT lists.bnl.gov>
Cc: 张炜 <wzhang AT m.scnu.edu.cn>
Subject: Re: [Star-hp-l] HP-pwg meeting 10 AM BNL time, 10th Aug 2023

 

Dear All，

I'd like to give an update on AuAu27、19.6、14.6GeV analysis.

Best，

Wei

 

 

 

------------------ Original ------------------

From:  "STAR HardProbes PWG"<star-hp-l AT lists.bnl.gov>;

Date:  Wed, Aug 9, 2023 07:53 PM

To:  "STAR HardProbes PWG"<star-hp-l AT lists.bnl.gov>;

Cc:  "Roy Chowdhury Priyanka (DOKT)"<priyanka.roy_chowdhury.dokt AT pw.edu.pl>;

Subject:  Re: [Star-hp-l] HP-pwg meeting 10 AM BNL time, 10th Aug 2023

 

Hello Nihar and all,

I will give an update on track merging issue for D0-hadron femtoscopy. I will upload my slides later.

Regards,

Priyanka

---

From: Star-hp-l <star-hp-l-bounces AT lists.bnl.gov> on behalf of Nihar Sahoo via Star-hp-l <star-hp-l AT lists.bnl.gov>
Sent: Tuesday, August 8, 2023 10:06 AM
To: Star-hp L <Star-hp-l AT lists.bnl.gov>
Cc: Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>
Subject: [Star-hp-l] HP-pwg meeting 10 AM BNL time, 10th Aug 2023

 

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

Meeting ID: 161 141 9615
Passcode: 744968


Regards,
Isaac, Yi and Nihar
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~ Neil

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~ Neil

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