STAR Flow, Chirality and Vorticity PWG

["Zuowen Liu" <liuzw AT mails.ccnu.edu.cn>]

Dear Prof. ShinIchi,

Thanks a lot for your nice suggestions.

Junyi and I have talked about the approximation on sqrt(2).

We agree that the approximation is not appropriate, and it would be corrected.

For the mom. cons. effect, I agree if we reconstruct EP with one arm of EPD, we would face the p cons. effect due to the asymmetry. But I don't understand why we need to worry about p cons. if we used 2-sub event, where the mom is conserved "naturally" due to the symmetric track direction. While Junyi and I could take a quick cross-check for the 

single and two EPDs.

Thanks and Best regards,

Zuowen

 

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

From:  "EsumiShinIchi via Star-fcv-l"<star-fcv-l AT lists.bnl.gov>;

Date:  Tue, Oct 17, 2023 11:14 AM

To:  "star-fcv-l"<star-fcv-l AT lists.bnl.gov>;

Cc:  "ShinIchi Esumi"<esumi.shinichi.gn AT u.tsukuba.ac.jp>;

Subject:  [Star-fcv-l] mom.-cons. effect in 2-sub e.p. resolution estimation...

 

Dear Zuowen (and Junyi)
I mentioned to Junyi about the approximation on sqrt(2), so I hope you can
communicate with Junyi on this. As I’ve also written in the chat window, I
send you the same (following) message just in case you might have missed,
that is about the mom.-cons. effect in 2-sub e.p. resolution estimation.

I should have asked this to Zuowen, who is doing similar 2 sub-event methods
for estimating e.p. resolution, I think we need to think about p-conservation
between 2-subs, by including and/or comparing the 3-sub or other methods in
order to understand the possible contribution from p-cons effect in the current
e.p. resolution estimation. While for measuring raw v1, it is canceled, since you 
use the combined E.P. from e/w EPDs, but as long as you are based on the
2-sub method between E-W event planes for the E.P. resolution estimation,
we are affected by the momentum conservation effect, that we would like
to subtract, as we could clearly see the effect using the single arm EPD plane
E or W, that is the p-cons effect between TPC and single EPD, which would be
different from the one between two EPDs...
Best regards, ShinIchi

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