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\title{$K^{*0}$ and $\phi$ production in Au+Au collisions at RHIC }
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\author{Aswini, Yan Huang, Weiguang Yuan (for the STAR collaboration) \\ 
%\emph{[1] Tsinghua University } \\ 
\vspace{3ex} \\ 
}

\date{\vspace{-3ex}}

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  $\quad$Heavy-ion collisions provide a unique opportunity to study the properties of the QCD matter at varying temperatures and densities. For the $K^{*0}$ resonance which has a short lifetime (4.16 fm/c), its yield may deviate from thermal model expectations due to hadronic processes (re-scattering and re-generation) that occur after the chemical freeze-out. On the other hand, the $\phi$ resonance, which has a longer lifetime (46 fm/c), has relatively small hadronic interaction cross section. Therefore, it is less susceptible to final-state effects and can be used to study the early evolution of the system.  In addition, coalescence model calculations indicate that the $\Omega/\phi$ yield ratio is sensitive to strange quark thermodynamic properties since both the $\Omega$ hyperons and $\phi$ mesons have relatively small hadronic interaction cross sections and their yields suffer minimal distortion from decay feed-down. Therefore, measuring the $\Omega/\phi$ yield ratio as a function of  collision energy can potentially probe the onset of deconfinement.
  
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  \quad In this talk, we will present measurements of $K^{*0}$ at $\sqrt{s_{NN}}$ = 19.6, 14.6 and 7.7 GeV and $\phi$ at $\sqrt{s_{NN}}$ = 27, 19.6, 14.6 and 7.7 GeV using high statistics STAR BES-II data. Transverse momentum spectra of $K^{*0}$ and $\phi$ will be presented in intervals of rapidity and centrality, and resonance to non-resonance particle ratios ($\phi/K$ and $K^{*0}/K$ ) will be shown as a function of centrality for various collision energies. In addition, rapidity dependence of $K^{*0}$ and $\phi$ production and the elliptic flow of $K^{*0}$ will be shown. Physics implications of these measurements will also be discussed.
  
  

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