STAR Flow, Chirality and Vorticity PWG

["Md. Nasim" <mnasim2008 AT gmail.com>]

Dear Niseem,

                      Let me make it clear again.

I am doing analysis using 6-particle and higher order correlation (7 and 8).

You have done 6-particle and lower order correlation (5,4,3 etc).

So only overlap or similarity is the 6-particle correlation observables, which you repeatedly pointed out.

Since there is an overlap for the 6-particle correlation, we can collaborate and cross-check similar observables. 

It does not matter whether we show individual terms and add them to make AS21 and AS31, all observables are sensitive to initial conditions and transport properties. I have the results of individual correlation terms for 7-order and 8-order, but I did not show them because we need more statistics. Please see the attached plot. As mentioned in my talk, we will present it after adding Run 14 and Run 16 data.

If you want, you can also do 7 and 8-order correlation, after all, it is STAR data and anyone can do any analysis.

On Wed, Apr 5, 2023 at 11:14 PM Niseem Magdy <niseemmagdy AT yahoo.com> wrote:

Hi Nasim,

I think the analyses is very similar, take the attached plot for example (it gives the mixed harmonic correlations between v^4_n and v^2_m) this is the 6-PC that will be used in your AC2,1(m,n) on your slide 2. Also the other 4-PC and 2-PC are presented or published. With that being said I do not see a problem I'm not interested in looking into the AC2,1 I'm looking into the individual correlations which is sensitive to the final state effect.

Thanks,
Niseem

On 4/5/23 1:25 PM, Md. Nasim wrote:

Hi Niseem,

                   Thanks for your reply.  Let me explain what I plan to do in this study.

As mentioned in the title of my talk, I am only interested in measuring higher-order correlation (6-particle and 8-particle correlation)  using high statistics data sets at 200 GeV AuAu (Run 11 +14+ 16) and Isobar. To do higher order cumulant, one needs to measure lower order as well and some of the terms may be common in our analysis that does not mean I am presenting the same results that you already have but just adding them. 

But I agree, our physics motivation is the same as mentioned in the first symmetric cumulant paper from RHIC, PLB 783, 459, 2018 .

On Wed, Apr 5, 2023 at 9:44 PM Niseem Magdy via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Hi Nasim,

I see your point; however, both observables are similar. Please see my recent PRC on this part, "Niseem Magdy Phys.Rev.C 107, 024905 (2023)" You will find all the equations on the APPENDIX. We are using the same equations. The only difference is that I'm reporting the individual parts of the observable, and you are adding them together. To get the AC_21(m,n), you need to measure the 6-, 4-, and 2-PC of n and m. In addition, there is not much difference between ATLAS paper using the Q-cumulant method and both of our works. On page 6 of "arXiv:2101.05619" they speak to how one can construct asymmetric cumulants, which is a part of my work. However, we are talking about the symmetric cumulants part. Also, you can find in my recent paper, I pointed out the difference in analyses and the purpose of different observables.

Thanks,
Niseem

On 4/5/23 11:43 AM, Md. Nasim via Star-fcv-l wrote:

Hi Nissem,

                Thanks for sharing your analysis details. 

https://drupal.star.bnl.gov/STAR/system/files/Flow_PT_Cmeeting_Feb_2023.pdf

I have quickly gone through it, it is very interesting. 

However, I can see my observable i.e "Asymmetric cumulant" (taken from PRC 105 (2022) 024912) is not the same as your observables which is similar to the ATLAS paper (JHEP 01 (2020) 51).

The main difference is reported and shown in detail in PRC 105 (2022) 024912.

Please look at page 6 of the paper (arxiv link: https://arxiv.org/pdf/2101.05619.pdf)

Although we used the same name, the observable is different.

On Wed, Apr 5, 2023 at 8:09 PM EsumiShinIchi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Xionghong
I would guess you are using Epd E-W 2-sub correlation to estimate the
Epd combined resolution via chi extraction (right?), which might be affected
by the p-cons effect (in the resolution estimation, although Epd combined
plane is used) as Sergei pointed out. EpdE-EpdW-TPC 3-sub correlation
plus EpdFull-TPC correlation would give the same Epd combined resolution,
which might still be affected by the same effect. Therefore one could also
try EpdInn-EpdOut-TPC 3-sub plus EpdFull-TPC correlation could give
somewhat different Epd combined resolution, since TPC resolution would
be different between the 2 cases, that you could try to answer such question.
One can also do the two v1 measurements just with EpdE or EpdW plane
to be compared with the current one using Epd combined plane, but the
resolution is always affected, when you start with E-W correlation.

Since the low pT region of triton seems to be strange to me, I also wonder
deuterons at low pT region were OK or not. Please make sure the purity.
Anyway, thank you very much for the interesting results… I’m looking for
more differential pT and centrality dependent studies.
Best regards, ShinIchi

> On Apr 5, 2023, at 9:52, Xionghong via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>
> Dear Subhash,
>
> My slides for the meeting tomorrow can be found at the link
> https://drupal.star.bnl.gov/STAR/system/files/PWG_LightNucleiv1atBES2_Xiongh
> ong_20230405.pdf.
>
> Thanks and best regards,
> Xionghong
>
>> -----Original Message-----
>> From: star-fcv-l-bounces AT lists.bnl.gov
> [mailto:star-fcv-l-bounces AT lists.bnl.gov]
>> On Behalf Of Xionghong via Star-fcv-l
>> Sent: Tuesday, April 4, 2023 9:50 AM
>> To: 'subhash' <subhash AT rcf.rhic.bnl.gov>; 'STAR Flow, Chirality and
> Vorticity
>> PWG' <star-fcv-l AT lists.bnl.gov>
>> Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed. 9:30 AM
> EDT
>>
>> Dear Subhash,
>>
>> I would like to present light nuclei v1 measurements at 14.6 GeV and 19.6
> GeV.
>> Please add me to the agenda. I will post my slides later. Thanks.
>>
>> Best regards,
>> Xionghong He
>>
>>> -----Original Message-----
>>> From: star-fcv-l-bounces AT lists.bnl.gov
>> [mailto:star-fcv-l-bounces AT lists.bnl.gov]
>>> On Behalf Of subhash via Star-fcv-l
>>> Sent: Monday, April 3, 2023 9:55 PM
>>> To: STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
>>> Subject: [Star-fcv-l] FCV PWG meeting on 05/April/2023 Wed. 9:30 AM
>>> EDT
>>>
>>> Dear All,
>>>
>>> We shall have our weekly FCV PWG meeting this Wednesday
>>> (05/April/2023) at
>>> 9:30 AM EDT. If you would like to present please let us know. Please
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>> posting
>>> your slides by Tuesday. The agenda will be collected at:
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Thanks,

With Best Regards,

Nasim

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Thanks,

With Best Regards,

Nasim

--

Thanks,

With Best Regards,

Nasim

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