# Measurements of $\Lambda_c^+$ and $D_s^+$ productions in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from STAR

## TL;DR

This paper presents the first measurements of $ ext{Lambda}_c^+$ and $D_s^+$ baryon and meson production in Au+Au collisions at 200 GeV, revealing significant enhancements over p+p collisions and comparing results to theoretical models.

## Contribution

First measurement of $ ext{Lambda}_c^+$ and improved $D_s^+$ production data in Au+Au collisions at 200 GeV, with comparison to theoretical models including coalescence and thermalization.

## Key findings

- $ ext{Lambda}_c^+/D^0$ ratio is significantly enhanced in Au+Au collisions.
- $D_s^+/D^0$ ratio is also enhanced but less than predicted by some models.
- Model calculations including coalescence are consistent with $ ext{Lambda}_c^+/D^0$ data.

## Abstract

We report the first measurement of $\Lambda_c^+$ (average of $\Lambda_c^+$ and $\bar{\Lambda}_c^-$) baryon production and significantly improved measurement of $D_s^+$ (average of $D_s^+$ and $D_s^-$) meson production, within the rapidity range of $\left|y\right| < 1$ in Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV from the STAR experiment. The transverse momentum spectra of $\Lambda_c^+$ and $D_s^+$ as well as their yield ratios to that of $D^0$ meson are also presented and compared to theoretical calculations.Both the $\Lambda_c^+/D^0$ and $D_s^+/D^0$ ratios are found to be significantly enhanced in Au+Au collisions with respect to those in p+p collisions predicted by PYTHIA. A model calculation including coalescence hadronization and thermalized charm quarks is consistent with the measured $\Lambda_c^+/D^0$ ratio. On the other hand, the TAMU model seems to underestimate the $D_s^+/D^0$ ratio measured in Au+Au collisions in the applicable kinematic region.