STAR Flow, Chirality and Vorticity PWG

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

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