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\title{Strangeness production and probing energy dependence of hadronic phase from BES at STAR}
\author{Sameer Aslam, Yan Huang, Aswini Kumar Sahoo and Yingjie Zhou\\ (for the STAR Collaboration)}
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Searches for the QCD critical point and the onset of deconfinement are the main motivations of the Beam Energy Scan (BES) program at RHIC. Strangeness production has been suggested as a sensitive probe to the early-time dynamics of the deconfined matter. Due to the short lifetime, the production of resonances, e.g. $K^{\ast 0}$, provides a unique opportunity to study the effect of rescattering and regeneration in the hadronic phase of heavy-ion collisions. The BES Phase I (BES-I) data taken during 2010 and 2011 have indicated potential changes of medium properties at low energies. However, the statistics collected during BES-I are not sufficient to draw definite conclusions. Since 2018, STAR has accumulated high statistics Au+Au datasets at various energies below 27 GeV during BES Phase II (BES-II) campaign.

Production of $K^0_{S}$, $\Lambda$, $\Xi$, $\Omega$ and $\phi$ from BES-II Au+Au collisions at $\sqrt{s_{NN}}=$ 27, 19.6, 14.6 and 3 GeV will be presented in this talk. The strange hadron spectra, nuclear modification factors, particle ratios,  rapidity density distributions, and centrality dependence will be reported. The physics implications on the collision dynamics will be discussed. We will also report the mass, width and invariant yields of $K^{\ast 0}$ using BES-I data ($\sqrt{s_{NN}}$ = 7.7-54.4 GeV). The average transverse momenta of $K^{\ast 0}$ and $\phi$ as well as the resonance to non-resonance particle ratios will be shown and compared with the measurements at SPS and LHC energies. The energy dependence of hadronic phase lifetime will be studied.

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