Centrality dependence of light (anti)nuclei and (anti)hypertriton production in Au+Au collisions at $\sqrt{s_{\rm{NN}}}$ = 200 GeV

TL;DR

This study investigates how the production of light (anti)nuclei and hypertriton varies with collision centrality in gold-gold collisions at 200 GeV, using a coalescence model based on simulated hadronic final states.

Contribution

It introduces a combined PACIAE and coalescence model approach to analyze centrality dependence of light (anti)nuclei and hypertriton production, aligning with experimental data.

Findings

Yields decrease rapidly with increasing centrality.

Yield ratios are independent of centrality.

Production is concentrated in central collisions.

Abstract

We have used the dynamically constrained phase space coalescence model to investigate the centrality dependence of light (anti)nuclei and (anti)hypertriton production based on the $6.2\times 10^7$ hadronic final states generated by the PACIAE model in Au+Au collisions at $\sqrt{s_{\rm{NN}}}=200$ GeV in $|y| <1$ and $p_T<5$ acceptances. It turned out that the yields of light (anti)nuclei and (anti)hypertriton strongly depend on the centrality, i.e. their yields decrease rapidly with the increase of centrality bins; but their yield ratios are independent on centrality. These theoretical results are consistent with the STAR and PHENIX data. Furthermore, centrality distribution of $d$ ($\bar d$), $^3{He}$ ($^3{\bar{He}}$) and $_{\bar\Lambda}^3H$ ($\bar{_{\bar\Lambda}^3H}$) follows Gaussian distributions. This means that light (anti)nuclei and (anti)hypertriton are primarily produced in the central collisions.