STAR HardProbes PWG

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

Hi Jiangyong and James,

Thanks for the discussion. A "centrality for centrality" comparison can be found in my QM talk slide 12: 

https://indico.cern.ch/event/895086/contributions/4724877/attachments/2421964/4145646/TongLiu_QM22_final.pdf

However if you want to see nPDF difference, then I agree with James that we need to get a "Npart for Npart" ratio. Actually I'm planning to talk to the centrality group in the coming weeks about a finer centrality binning, and I think we can also try to push for something like a RefMultCorr classification that leads to the same <Npart>.

Tong Liu

Ph.D. Student '2023 

Physics Dept., Yale University

Tel: 203-435-2130

On Sun, Sep 25, 2022 at 11:09 AM James Dunlop via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi Tong, Jiangyong,
   It  is clear in the plot that the Npart are shifted
in the bins between Ru and Zr,  so a direct ratio would
be comparing at different Npart.  I read the
plot as pretty clear that  Npart is the correct
scaling, most clearly seen on the red and blue most peripheral
points which are different but really look like they fall on a
common curve vs Npart.

If you want to look for effects I'd argue that you'd
want to compare between Ru and Zr at common Npart (or just
multiplicity) as a 0th order
removal of system size dependence. 
--J

> On Sep 23, 2022, at 6:12 PM, Jiangyong Jia via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:
>
>
> Hi, Tong,
>
> I found your RAA compared between Ru and Zr on slide 2 interesting.
> Could you make a double ratio (i.e pp baseline is cancelled)? I want to see if you see difference between Ru and Zr out to high pT due to difference between nPDF between isobars?
>
> Thanks,
> Jiangyong
>
>
> On 9/23/22 6:01 PM, Tong Liu via Star-hp-l wrote:
>> 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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