Strangeness in Quark Matter 2024 (SQM 2024)

Production of light nuclei in Au+Au collisions with the STAR BES-II program

5 juin 2024, 12:00

20m

Room Londres 1 (Palais de la Musique et des Congrès)

Talk Resonances and Hyper-nuclei Track3-Res&Hyp

Orateur

Yixuan Jin (Central China Normal University)

Description

The production mechanism of light (anti-)nuclei in heavy-ion collisions can be either by the thermal model or the coalescence model. By studying the yields and ratios of light (anti-)nuclei, we can gain insight into their production mechanism and physical properties of the expanding system at freeze-out. Furthermore, the enhancement in the light nuclei compound ratios such as $N_t{N}_p/N_d^2$ and $N_{{}^{3}He}{N}_p/N_d^2$ from the coalescence baseline, has been suggested as a potential probe to search for the critical phenomena in the QCD phase diagram. This enhancement might be a consequence of the enhanced baryon density fluctuations when the system is in vicinity of the critical point or the first-order phase transition. In the first phase of the Beam Energy Scan (BES-I) program at RHIC, an enhancement relative to the coalescence baseline of the light nuclei yield ratio ($N_t{N}_p/N_d^2$) is observed in the most central Au+Au collisions at $\sqrt{s_{NN}}$ = 19.6 and 27 GeV with a combined significance of 4.1$\sigma$. The large datasets ($\sim 10\times$BES-I) taken by the STAR BES-II with enhanced detector capabilities will greatly improve the precision of the new measurements.

In this talk, we will present the centrality and energy dependence of transverse momentum ($p_T$) spectra of $p$, $\overline{p}$, $d$, $\overline{d}$, and ${}^{3}He$ in Au+Au collisions at BES-II energies of $\sqrt{s_{NN}}$ = 7.7 -- 27 GeV. We will also report the centrality and energy dependence of integrated particle yields ($dN/dy$) and mean $p_T$ ($⟨p_T⟩$) of light nuclei. We will discuss the centrality and $p_T$ dependence of the coalescence parameters ($B_2(d)$ and $B_3{(}^{3}He)$). The physics implications of these results will be discussed.

Documents de présentation

SQM2024_final.pdf

Examen par les pairs

Article

Accepté le 29 nov. 2024 par Boris Hippolyte

275_[Parallel-3]_LightNucleiProductionWithSTARBESII_YixuanJin_v2024-11-29.pdf