Charged Hadron Production from Au+Au Collisions at $\sqrt{ s_{NN} } $ = 27 GeV at STAR

The Relativistic Heavy Ion Collider (RHIC) beam energy scan I (BES-I) covered a range of energies from $\sqrt{ s_{NN} } $ = 62.4 to 7.7 GeV and ran from 2010 to 2014. Only mid-rapidity spectra for $\pi$, $K$, and p have been published from those energies. The BES-I results have justified a new beam energy scan (BES-II) with higher statistics and a series of detector upgrades. The first collider energy from BES-II, 27 GeV, was run in 2018. This analysis will address the spectra and yields of $\pi$, $K$, and p as a function of rapidity and centrality from the 27 GeV Au+Au collisions from 2018 at RHIC. The relative yields of the various particle species allow for a measurement of the chemical freeze-out temperature and baryon chemical potential. The $K^{+}$ to $K^{-}$ ratio gives insight into associated production as an alternative to thermal production. The $p$ to $\bar{p}$ ratio determines the baryon chemical potential, pinning down the collision's location on the QCD phase diagram. The parameters extracted from the 4$\pi$ yields in the current analysis are compared to experimental results extracted from previous mid-rapidity particle yields.