STAR Flow, Chirality and Vorticity PWG

["Wang, Fuqiang" <fqwang AT purdue.edu>]

Hi Baoshan,

Please find below my comments to your QM proceedings.

Your statement on rho spin alignment effect on CME measurements is misleading. It gives the impression that it affects all CME Delta gamma measurements. I suggest the following formulation, especially the last sentence I recommend you add:

The study revealed a clear dependence of THE CME-SENSITIVE ∆γ112 observable on ρ0 meson’s ρ00. When the global spin alignment of ρ0 is larger (smaller) than 1/3, it CONTRIBUTES A POSITIVE (NEGATIVE) BACKGROUND TO the ∆γ112. Thus, investigating the global spin alignment of ρ0 mesons is IMPORTANT to understanding its impact on THE CME-SENSITIVE ∆γ112 observable. ON THE OTHER HAND, NEW CME OBSERVABLES, SUCH AS THE SPECTATOR/PARTICIPANT PLANE ∆γ112 RATIO, ARE NOT EXPECTED TO BE AFFECTED.

I would combine Eqs. 1 and 2 by using \pm sign.

In referring to the spectator plane and participant plane spin alignment results in Fig.1, you state “Notably, there was no significant difference observed in the physics contribution concerning the participant plane and spectator plane.”
I admit I never understood the consistency or inconsistency between these two measurements. The data used for the two measurements are identical, with the only difference being the event planes. So, the data stat. and syst. uncertainties are completely correlated. Wouldn’t the results be just a constant ratio between the two, with the ratio being cos(2\Delta\Psi)? Why would it be anything else? This point should be clarified.

About the band in the right panel of Fig.1, my understanding is that it's the theory fitting error coming from our own data uncertainty of the BES-I measurements published in nature, not theoretical uncertainty. If so, then why is the band relevant at all in comparing to data? We should just compare our data to the theoretical curve, otherwise we’re fooling ourselves by using the data error twice. If we do want to include the band in the figure, then the band should now be significantly shrunk with the BES-II data, and we should clearly point out how the band was obtained and how it’s correlated with the data error.

Best regards,

Fuqiang

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Subject: [Star-fcv-l] STAR presentation by Baoshan Xi for Quark Matter 2023 submitted for review

 

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