STAR Flow, Chirality and Vorticity PWG

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

ps: For the next iteration, please add latex line numbers.


On 2023-11-23 05:15 PM, subhash via Star-fcv-l wrote:
> 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
> > _______________________________________________
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