STAR HardProbes PWG

[Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>]

Hello Dandan,

Please find my comments on your nice proceedings.

Abstract:
1. "The large scale set by the charm mass means the heavy quark pairs 
are produced early…" -> "The heavy quark pairs are produced early…"
2. Because of this, J/psi -> "The J/psi…"
3.  "In Ru+Ru and Zr+Zr… contributions, respectively." -> Too long and 
complicated sentence, break it.
4. we will present -> we present
5. in the mid-rapidity -> at mid-rapidity
6. the Collins-Soper frame ;  "and with respect to the event plane." -> 
"and also with respect to the event plan."

L9: a new perspective -> a new insight
L12: "STAR collaboration observed, for the first time, that the 𝜙 meson 
exhibits a global spin alignment " -> "STAR collaboration reported for 
the first time global spin alignment of 𝜙 meson."

L14: "the observed polarization of 𝐽/𝜓 " -> the J/psi polarization 
sensitive …"  [see L22, you mentioned "no observation yet" and also you 
are are measuring in this proceeding]
Why do you discuss phi meson spin alignment and J/psi polarization in 
the same para? Make it two separate para. They are two different topics.

L20: experimental measurements ->  𝐽/𝜓 polarization measurement is
L21:	it can have an impact on the polarization of  -> it contributes to 
the J/psi polarization.
L24: The presence of QGP will affect 𝐽/𝜓 polarization. -> The QGP could 
affect 𝐽/𝜓 polarization in heavy-ion collisions.
L25:	the inclusive 𝐽/𝜓 component differs -> Not clear what is that 
"component"?
L29:    meson, 𝜆𝜃, between  ->meson between [you introduced later]

Eq.1:  W(cos theta, phi) -> make "cos" roman. [check other places]
L59: xz plane -> xz-plane
L60:	and of the decaying particle itself.  -> and the decaying particle 
itself.
L65: in both HX and CS frames -> in both the HX and CS frames
L74:	Bring the relationship between polarization …distribution function 
-> Not a clear sentence.
Secondly, chnage "polarization density matrix" to "spin density matrix";
Recall we had a discussion before, we should not mix "polarization" and 
"spin alignment".


L79: "where 𝜃∗ is the polar angle between the z-axis …" ->Here you need 
to mention what is z-axis? As you have already mention HX, CS frame. So 
you must mention how do you assign z-axis in the spin-alignment 
analysis?

Fig.1 caption: invariant mass spectrum for unlike-sign -> invariant mass 
spectrum for the same event unlike-sign…

L85: −1 < 𝜂 < 1 and a full azimuthal angle (−𝜋 < 𝜙 < 𝜋) -> |eta| < 1 and 
within full azimuthal angle.
L97: extracting data from 7 cos𝜃 bins spanning from -1 to 1 -> 
extracting data from the seven bins of cos theta spanning from -1 to 1
 [similarly for L99]

L100: Fig.  2 -> Fig. 2 [no gap] same for other cases like L130, L127, 
and also Eqs.   (5) and …

L106: elaborate "  from gamma conversions "
L108: by unfolding
L109:the correct input distributions in MC are not known a priori  -> 
Not clear, we do know inout distribution in embedding. Do you mean the 
"true distribution of J/psi or its decayed electron" ? If yes, please 
mention it clearly.

L131: to obtain the rho_00
This procedure is repeated for different centrality and Npart 
selections. -> Remove it, not needed.

L133: "The 𝐽/𝜓 polarization parameters (𝜆𝜃 and 𝜆𝜙)….complete Run 2018 
isobar data sample." -> remove it. Not needed. You already discussed.
Fig.3 caption: "as a function of 𝑝𝑇" -> is this J/psi pT? If yes, then 
mention it. And change x-axis title to " p_{\rm T}^{J/\psi}" because you 
have used the same notation in the text.
L137: "		consistent with zero in both the HX and CS frames " -> does 
this imply that "J/psi polarization is zero" ?

L138: a slight indication of non-trivial -> an indication of non-trivial
"but overall, there is …" -> Remove it, you already mentioned it in L137 
; meaning is the same.
L140: agreement with the uncertainties with… -> agreement, within the 
uncertainty, with …
L141:           GeV,[4].  ->                 GeV [4].

L142-143: "Furthermore, the analysis of the 𝐽/𝜓 …. as demonstrated in 
the right panel of Fig. 3." -> The same repetition you discussed in the 
previous section. Remove it. Directly mention what you observed and 
conclusion.
L147: in the 0.3 < … -> in the range of 0.3 <…
L147: The results obtained are visually represented -> The results are 
presented in Fig. 4.
L149: < 0.6 -> …< 0.6 GeV/c

L154: polarization and 𝐽/𝜓 spin alignment  -> polarization and spin 
alignment
L155: heavy-ion collisions completed at RHIC energy -> heavy-ion 
collisions at RHIC energy
L157:           Ru+Ru Zr+Zr -> Ru+Ru and Zr+Zr
L158: from -> range

L157-159: "The J/psi polarization …CS frames" -> Sloppy writing. Break 
this sentence.
L160: ",confirming the reliability of the results " -> Remove this. All 
our measurements are reliable. Don't you have confidence?

L160-162: "𝐽/𝜓 global spin alignment …" -> the same Sloppy writing.

L164: "…are very welcome and crucial to understanding the physics." -> 
"Theory calculations are needed to explore the underlying physics."


Best
Nihar


On 2023-12-13 07:55, webmaster--- via Star-hp-l wrote:
> Dear Star-hp-l AT lists.bnl.gov members,
>
> Dandan Shen (shendandan AT mail.sdu.edu.cn) has submitted a material for a
> review, please have a look:
> https://drupal.star.bnl.gov/STAR/node/66258
>
> ---
> If you have any problems with the review process, please contact
> webmaster AT www.star.bnl.gov
> _______________________________________________
> Star-hp-l mailing list
> Star-hp-l AT lists.bnl.gov
> https://lists.bnl.gov/mailman/listinfo/star-hp-l