STAR Flow, Chirality and Vorticity PWG

[subhash <subhash AT rcf.rhic.bnl.gov>]

Dear Chendong,

Nicely proceedings. I have a few suggestions below for your 
consideration:

Abstract:
--------------------
"These results imply that the coalescence procedure dominants the 
formation mechanism"
--> These results suggest that the coalescence mechanism plays a 
dominant role in the formation of light- and hyper-nuclei.


1 Introduction
--------------------
"The RHIC two-phase Au + Au collisions beam energy scanning experiment 
BES-I and BESII is to produce nuclear matter with different temperatures 
and baryon chemical potentials by changing the collision energy, to find 
the first-order phase transition and QCD critical point in high baryon 
density region."
--> The two phases of the Beam Energy Scan program at RHIC, BES-I and 
BES-II, aim to investigate nuclear matter at different temperatures and 
baryon chemical potentials by colliding gold nuclei at various collision 
energies. The goal is to identify the first-order phase transition and 
the QCD critical point within the high baryon density region.


"so it is possible to study the collective flow of light- and 
hyper-nuclei." --> you can probably make a new sentence: This allows for 
the study of the collective flow of light- and hyper-nuclei.

"Where the light-nuclei carry information about local baryon density 
fluctuations at freeze-out, which offers insights on the final state 
nucleon-nucleon (N−N) interaction. And hyper-nuclei provide access to 
the hyperon-nucleon (Y −N) interaction."
--> A better rephrase: Light-nuclei, in particular, carry information 
about local baryon density fluctuations at freeze-out, providing 
insights into the final state nucleon-nucleon (N−N) interaction. 
Hyper-nuclei, on the other hand, offer access to the hyperon-nucleon 
(Y−N) interaction.

"mainly because of it is genuinely sensitive to early collision 
dynamics."
--> primarily due to its sensitivity to the early dynamics of the 
collision.

"The first harmonic coefficients" --> The first harmonic coefficient 
.... called the directed flow (v1), has been analyzed using different 
particle species.

2 Experiment and data analysis
--------------------
"setup in 2018 for the center-of-mass energy √sNN = 3.0 GeV, in 2019 for 
3.2 GeV, in 2020 for 3.5 GeV and 3.9 GeV"
--> setup during 2018-2020 for the center-of-mass energies at √sNN = 
3.0, 3.2, and 3.9 GeV

"The main charged-particle tracking and particle identification 
detectors are the Time Projection Chamber (TPC) [11] and the 
Time-of-Flight (TOF) barrel [12] placed inside a 0.5 T solenoidal 
magnetic field along the beam direction."
--> I think you can split it into two sentence: TPC is used for 
tracking, while a combination of TPC=TOF is used for PID.

" In order to balance the..."
--> I suggest to rewrite something like: In order to achieve better 
precision, ....

"Fig.1 shows the reconstructed invariant mass distributions for 3ΛH and 
4ΛH 2-body decay with topological cuts and phase space cut of 3.2, 3.5 
and 3.9 GeV, and obvious hyper-nuclei signals with good significance can 
be observed."
--> Fig.1 shows the reconstructed invariant mass distributions for 3ΛH 
and 4ΛH 2-body decay using phase space listed in Table 1 for 3.2, 3.5 
and 3.9 GeV. Combinatorial backgrounds for hyper-nuclei are constructed 
by rotating decay daughter particles through a random angle between 10◦ 
and 350◦. The signal is fitted with a Gaussian plus a linear function  
....

"Due to the collective flow dependent on the pT range, "
--> Since the collective flow depends on the pT range of particle 
species, for a meaningful comparison we use same pT /A range when 
comparing different species and it is listed in Table-1.

"Due to the statistics is poor for 3 ΛH and 4ΛH...."
--> Due to limited statistics for 3 ΛH and 4ΛH

" In all this fit, zero point (0,0) is forced going through, taking the 
advantage of the symmetry"
--> In all the above cases, the fit is constrained to pass through (0,0) 
taking the advantage of the symmetry.

"arising from the particle misidentification determined by varying the 
cuts on z and m2"
--> arising from the particle misidentification.
Here z and m2 are not defined.



3 Results and Discussion
--------------------
"For comparison, the hadronic transport model (JAM2) with coalescence 
afterburner calculations are also added, which is consistent with 
observed energy dependence."
--> The hadronic transport model (JAM2) with coalescence afterburner 
calculations are consistent with observed energy dependence.


4 Summary
--------------------
"In this paper we report the collision energy and particle mass of the 
directed flow"
--> In these proceedings, we report the collision energy and particle 
mass dependence of the directed flow (v1) ... at in 3.0, 3.2, 3.5 and 
3.9 GeV ...

"Calculations of hadronic transport model plus coalescence afterburner 
.... "
--> Calculations of hadronic transport JAM model with a coalescence 
afterburner can qualitatively reproduce the observed dependence for 
hyper-nuclei as well as light-nuclei collective flow measurements. It 
suggests that the dominant process in the underlying production 
mechanism for light clusters is the coalescence process.

"The STAR experiment has collected 2 billion events for the 3.0 GeV Au + 
Au collisions which will help us to further constrain coalescence 
parameters for both light- and hyper-nuclei at the high density region."
--> Moreover, results from a high statistics 2 billion event samples for 
the 3.0 GeV Au + Au collisions will significantly enhance the precision 
and help constrain coalescence parameters for both light- and 
hyper-nuclei at the high density region.


Thanks and regards,
Subhash


On 2023-11-23 01:42 PM, webmaster--- via Star-fcv-l wrote:
> Dear star-fcv-l AT lists.bnl.gov members,
>
> Chengdong Han (chdhan AT impcas.ac.cn) has submitted a material for a 
> review,
> please have a look:
> https://drupal.star.bnl.gov/STAR/node/66064
>
> ---
> If you have any problems with the review process, please contact
> webmaster AT www.star.bnl.gov
> _______________________________________________
> Star-fcv-l mailing list
> Star-fcv-l AT lists.bnl.gov
> https://lists.bnl.gov/mailman/listinfo/star-fcv-l