STAR Flow, Chirality and Vorticity PWG

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

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
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