Elliptic flow measurements of strange and multi-strange hadrons in isobar collisions at RHIC

We present measurements of elliptic flow ([Formula: see text]) of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] at mid-rapidity ([Formula: see text]) in isobar collisions ([Formula: see text]Ru+[Formula: see text]Ru and [Formula: see text]Zr+[Formula: see text]Zr) at [Formula: see text] [Formula: see text]GeV by STAR. The centrality and transverse momentum ([Formula: see text]) dependence of elliptic flow are presented and the Number of Constituent Quark (NCQ) scaling of [Formula: see text] in isobar collisions is discussed. The [Formula: see text]-integrated elliptic flow ([Formula: see text]) is observed to increase from central to peripheral collisions. The ratio of [Formula: see text] between the two isobars shows a deviation from unity for strange hadrons ([Formula: see text], [Formula: see text] and [Formula: see text]) suggesting differences in nuclear structure and deformation between the systems. Additionally, a dependency of strange hadron [Formula: see text] on the system size at high [Formula: see text] is observed across various collision systems, including Ru+Ru, Zr+Zr, Cu+Cu, Au+Au and U+U. A Multi-Phase Transport (AMPT) model with String Melting (SM) describes the experimental data well in the measured [Formula: see text] range for isobar collisions at [Formula: see text] [Formula: see text]GeV.