\documentclass[
 reprint,
 amsmath,amssymb,
 aps,
 prc,
]{revtex4-2}

\bibliographystyle{apsrev4-1}

\usepackage[colorlinks]{hyperref}
\usepackage{graphicx}
\usepackage{dcolumn}
\usepackage{bm}
\usepackage[mathlines]{lineno}
\usepackage[mathlines]{lineno}
\usepackage{hyperref}
\usepackage{placeins}
\usepackage{multirow}
\usepackage{ulem}
\usepackage{lineno}
\setcounter{tocdepth}{4}
\setcounter{secnumdepth}{4}
\linenumbers\relax 

\newcommand{\ppt}{p_{\rm T}}
\newcommand{\sqrtsNN}{\mbox{$\sqrt{\mathrm{s}_{_{\mathrm{NN}}}}$}}
\def \auau  {Au+Au}
\def \ruru {Ru+Ru}
\def \zrzr {Zr+Zr}
\newcommand{\mean}[1]{\left\langle #1 \right\rangle}

\begin{document}
\preprint{APS/123-QED}

\title{Higher-Order Cumulants of Net-Proton Multiplicity Distributions in Zr+Zr and Ru+Ru Collisions at \mbox{$\sqrt{\mathrm{s}_{_{\mathrm{NN}}}}$}~= 200\,GeV by the STAR Experiment}

\author{Ho-San Ko}
\affiliation{Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA}

\collaboration{for the STAR Collaboration}

\begin{abstract}
The Relativistic Heavy Ion Collider (RHIC) at Brookhaven is a facility to create and study the strongly interacting Quark-Gluon Plasma (sQGP). Higher-order cumulants of the conserved quantities and their ratios are powerful tools to study the properties of sQGP and explore the QCD phase structure, such as critical point and/or the first-order phase transition boundary. It has been reported by the STAR Collaboration that the fourth-order cumulant of the net-proton multiplicity distribution shows a non-monotonic energy dependence (\mbox{$\sqrt{\mathrm{s}_{_{\mathrm{NN}}}}$}~= 7.7 - 62.4 GeV). In addition, the comparison between the sixth-order net-proton cumulant results and Lattice QCD calculations suggests a smooth crossover transition in central Au+Au collisions at \mbox{$\sqrt{\mathrm{s}_{_{\mathrm{NN}}}}$}~= 200\,GeV.

 In this talk, we will present the net-proton cumulants and their ratios up to sixth-order as a function of multiplicity using high statistics data of Zr+Zr and Ru+Ru collisions at \mbox{$\sqrt{\mathrm{s}_{_{\mathrm{NN}}}}$}~= 200\,GeV. The STAR experiment collected two billion events for each colliding system. We will compare the multiplicity dependence to the published net-proton cumulants in Au+Au collisions at \mbox{$\sqrt{\mathrm{s}_{_{\mathrm{NN}}}}$}~= 200\,GeV. In addition, we will compare the results to Lattice QCD, the Hadron Resonance Gas model, and hadronic transport model calculations. The physics implications will be discussed.
\end{abstract}

\maketitle

\end{document}