\documentclass{article}
%\topmargin -2cm
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\usepackage{graphicx}% Include figure files
%\usepackage{dcolumn}% Align table columns on decimal point
%\usepackage{bm}% bold math
%\usepackage{color}
\usepackage{lineno}
\usepackage[numbers,sort&compress]{natbib}
%\usepackage[top=1.54cm, bottom=1.54cm, left=2.18cm,right=2.18cm]{geometry} %页面边距
%\usepackage[colorlinks,
%           bookmarks=true,
%           linkcolor=blue,
%           %pdfborder=blue?
%           urlcolor=blue,
%            anchorcolor=black,
%            citecolor=blue
%            ]{hyperref}

%\usepackage[all]{hypcap}

\begin{document}
\begin{center}
\textbf{\Large Anisotropic flow of (multi-)strange hadrons and $\phi$ mesons in Au+Au collisions at $\sqrt{s_{NN}}$ = 3 - 19.6 GeV from STAR  
% Anisotropic flows of (multi-)strange hadrons and $\phi$ mesons at $\sqrt{s_{NN}}$ = 3 - 19.6 GeV in Au+Au collisions at STAR
 }\\
\end{center}
\begin{center}
\testbf{Li-ke Liu, Prabhupada Dixit, Ding Chen}\\

\textbf{for the STAR Collaboration}\\
\end{center}
\begin{center}
%\textbf{Central China Normal University}\\
\end{center}

\linenumbers

Directed and elliptic flow, $v_1$ and $v_2$,
% are the first and second harmonic coefficients in the Fourier expansion of the final state azimuthal distribution relative to the collision reaction plane. They 
are sensitive to dynamics of heavy-ion collisions at the early stage of the system evolution and equation of state of the medium. 
% Higher harmonic triangular flow, $v_3$, originating from initial geometry fluctuations, is suggested to be an even
% more sensitive probe for the viscosity of the medium and initial density profile of the colliding nuclei. 
The hadronic interaction cross sections of multi-strange hadrons and $\phi$ mesons are expected to be small and their freeze-out temperatures are close to the quark-hadron transition temperature. Hence, these hadrons may provide information primarily from the early stage of the high energy collisions and are important for the study of QCD phase diagram at RHIC.
 
In the first phase of RHIC beam energy scan (BES-I), we observed that $v_{1}$ slopes ($dv_{1}/dy$) at mid-rapidity region for net-proton and net-$\Lambda$ show a minimum value when the collision energy is around $\sqrt{s_{NN}}$ = 10 - 20 GeV~\cite{ref3}. The $v_2$ of $\phi$ mesons seems lower than those of other particles at $\sqrt{s_{NN}}$ = 7.7 and 11.5 GeV~\cite{ref4}. In this poster, with large statistics from the STAR fixed-target (FXT) and second phase of RHIC beam energy scan (BES-II), we will present precise measurements on $v_1$ and $v_2$ of $K^\pm$, $K_S^0$, $\Lambda$, $\bar{\Lambda}$, $\Xi$, $\bar{\Xi}^{+}$, $\Omega$, $\bar{\Omega}^{+}$, and $\phi$ mesons 
% together with $v_3$ results of $\phi$ mesons 
in Au+Au collisions at $\sqrt{s_{NN}}$ = 3 - 19.6 GeV from STAR. 
% Precise measurements of $v_{1}$ and $v_{2}$ for strange hadrons such as $K$, $\phi$, $\Lambda$, and $\Xi$ will shed light on the QCD phase structure at energies $\sqrt{s_{NN}}$ = 3 - 20 GeV.




%\nolinenumbers
\pagenumbering{gobble}
%\small

\begin{thebibliography}{99}


\bibitem{ref3}(STAR) L.~Adamczyk \textit{et al.},
%``Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions,''
Phys. Rev. Lett. \textbf{120}, 062301 (2018).
%200 citations counted in INSPIRE as of 28 Oct 2021
\bibitem{ref4}(STAR) L.~Adamczyk \textit{et al.},
%``Elliptic flow of identified hadrons in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7-62.4 GeV,''
Phys. Rev. Lett. \textbf{110}, 142301 (2013).
%149 citations counted in INSPIRE as of 28 Oct 2021
\end{thebibliography}

\end{document}