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Light Nuclei Production in Au+Au Collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV from the STAR experiment

by Hui Liu

This Submission thread is now published as SciPost Phys. Proc. 10, 040 (2022)

Submission summary

As Contributors: Hui Liu
Arxiv Link: (pdf)
Date accepted: 2022-05-06
Date submitted: 2022-03-15 09:09
Submitted by: Liu, Hui
Submitted to: SciPost Physics Proceedings
Proceedings issue: 50th International Symposium on Multiparticle Dynamics (ISMD2021)
Academic field: Physics
  • Nuclear Physics - Experiment
Approach: Experimental


Light nuclei production is expected to be sensitive to baryon density fluctuations and can be used to probe the signatures of QCD critical point and/or a first-order phase transition in heavy-ion collisions. In this proceedings, we present the spectra and yields of protons ($p$) and light nuclei ($d$, $t$, $^{3}\mathrm{He}$, $^{4}\mathrm{He}$) in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV by the STAR experiment. Finally, it is found that the kinetic freeze-out dynamics (temperature $T_{kin}$ $vs.$ average radial flow velocity $\langle\beta_{T}\rangle$) at 3 GeV extracted with the blast-wave model deviate from the trends at high energies ($\sqrt{s_{\mathrm{NN}}}$ = 7.7 - 200 GeV), indicating a different medium equation of state.

Published as SciPost Phys. Proc. 10, 040 (2022)

Author comments upon resubmission

Weaknesses: Surely due to the limited length of the paper the analysis part could profit from some small extension, discussing e.g. the contribution of the feed-down production to the final measurement.

Requested changes: I could submit the following suggestions: - "restricted volume of phase space" it is unclear what the author is referring to, either specify more either drop the sentence - If possible in the data analysis section I would add a sentence discussing the contribution to measured yields of the particles produced in the material

List of changes

-> Section2 Experiment and Analysis Details
We have added two paragraphs as the following:
For the final results, the several corrections must be applied. Due to the limited detector acceptance and efficiency, the raw spectra are corrected with TPC tracking efficiency and TOF matching efficiency, and the energy loss correction is also applied due to the loss of energy when particles traversing the detector material.
On the other hand, to consider the weak decay feed-down contribution from strange baryons to the proton is below 2%, in this proceeding, we have not applied the feed-down correction to the proton measurement. At this energy, without enough antiparticles, we also not removed the particles from material knock-out. Those corrections will be done in the future analysis.

-> Since the Legend font in Figure 1 is too small, we also change the legend on fig1

Submission & Refereeing History

Published as SciPost Phys. Proc. 10, 040 (2022)

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Resubmission 2110.10929v3 on 15 March 2022

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