STAR Flow, Chirality and Vorticity PWG

[ShinIchi Esumi <esumi.shinichi.gn AT u.tsukuba.ac.jp>]

Dear Prabhupada
One more point; the point 4 from Prithwish is one way of getting v2 with 3 
particle correlation "v2*v1*v1”, 
which gives us a "good" reaction plane v2 in stead of event plane v2, but it 
does not really help to improve 
the resolution, where I was talking in my previous E-mail, for that purpose, 
you need "2" inside cos() with 
Psi1 for the v2 resolution, in order for you to get the combined plane from 
different detectors with additional 
weighting factors between them based on the measured resolutions. I guess you 
know about it. 
Best regards, ShinIchi

> On Jul 29, 2021, at 1:11, ShinIchi Esumi 
> <esumi.shinichi.gn AT u.tsukuba.ac.jp> wrote:
> 
> Dear Prabhupada
> If you like to maximize the event-plane resolution, you could just use full 
> TPC region 
> including iTPC region for your 2nd order Q-vector and do your 
> phi-reconstruction analysis 
> with excluding the two tracks from the Q-vector for pair-by-pair, just to 
> exclude the trivial 
> auto-correlation, where you might worry about small (or zero) eta-gap 
> between POI and 
> EP, that can only matter if the statistical accuracy of the measurement is 
> very good that 
> you do not have at the moment. One could even combine EP from full 2nd 
> order TPC plane 
> and full 1st order EPD plane, that Prithwish mentioned below, using the 
> relative weighting 
> factor between TPC and EPD based on the measured resolution in order to 
> improve further 
> more. It’s good to go step by step with individual planes as you do now, 
> but at the end 
> the resolution indeed matters to get the best statistically significant 
> result, especially 
> for such measurement with rare species. 
> Best regards, ShinIchi
> 
>> On Jul 29, 2021, at 0:00, Prithwish Tribedy via Star-fcv-l 
>> <star-fcv-l AT lists.bnl.gov> wrote:
>> 
>> Hello Prabhupada,
>> Thanks for the update. A few follow-up comments.
>> 
>> 1. Please take a look at the run-by-run variation of QA variables. One can 
>> make use of the automated algorithm that was developed for isobar 
>> analysis. It takes histograms of quantities vs run number and gives you 
>> the bad runs.
>> /star/u/huyu/jumpcheck/jumpcheck_advanced.zip
>> 
>> 2. Please make sure you check the pile-up cuts by looking at TOF_match vs 
>> refMult correlation.
>> 
>> 3. For TPC event plane analysis instead of using 1>η>0.05 for particle of 
>> interest and -1<η<-0.05 for event plane (and vice versa) can you do the 
>> following. Use -0.9<η<0.9 for particle of interest and 1.5<|η|<0.9 for 
>> event plane.
>> 
>> 4. Use -0.9<η<0.9 for particle of interest and EPD first order planes for 
>> v2 estimations. You have to estimate v_211 = <cos(2φ - Ψ_1(east) - 
>> Ψ_1(west)>. The resolution for this measurement is Res(211) = 
>> <cos(Ψ_1(east) - Ψ_1(west))>.
>> 
>> 5. Please make plots of m^2 from TOF for each pT window and show the pion, 
>> kaon and proton peaks to understand the contamination.
>> 
>> 
>> Best,
>> Prithwish
>> 
>> 
>> 
>> 
>> On 2021-07-28 04:39, pdixit via Star-fcv-l wrote:
>>> Dear convenors and all,
>>> Please find the link to my slide for today's weekly meeting.
>>> https://drupal.star.bnl.gov/STAR/system/files/7p7_phiv2_analysis.pdf
>>> Thanks and regards,
>>> Prabhupada
>>> On 2021-07-27 15:52, pdixit wrote:
>>>> Dear convenors,
>>>> I would like to present my analysis on v2 of phi-meson in Au+Au
>>>> collision at 7.7 GeV in run-21. Please add me to the list for the
>>>> presentation. I will post my slides later.
>>>> Thanks and regards,
>>>> Prabhupada Dixit
>>>> On 2021-07-26 15:56, ShinIchi Esumi via Star-fcv-l wrote:
>>>>> Dear FCV PWG colleagues
>>>>> We will have our weekly FCV PWG meeting on this Wednesday morning 
>>>>> 28/July/2021
>>>>> 9:30AM in BNL (NY time zone) at our usual time and place. So if you
>>>>> have anything to
>>>>> present, please let us know and please post your slide by Tuesday. The
>>>>> zoom room link,
>>>>> ID and pass for the FCV PWG meeting are in our usual drupal agenda page 
>>>>> below.
>>>>> Please also keep in mind that all the preliminary plots should have
>>>>> already been there
>>>>> in the summary area below.
>>>>> Best regards, Jiangyong, Prithwish and ShinIchi
>>>>> Meeting agenda page with zoom link :
>>>>> https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr
>>>>> Preliminary page :
>>>>> https://drupal.star.bnl.gov/STAR/pwg/bulk-correlations/bulkcorr-preliminary-summary
>>>>> _______________________________________________
>>>>> Star-fcv-l mailing list
>>>>> Star-fcv-l AT lists.bnl.gov
>>>>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>>> _______________________________________________
>>> Star-fcv-l mailing list
>>> Star-fcv-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>> _______________________________________________
>> Star-fcv-l mailing list
>> Star-fcv-l AT lists.bnl.gov
>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l
>