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We report the measurements of spin alignment ($\rho_{00}$) for $K^{*0}$,$\overline{K^{*0}}$, $K^{*+}$, and $K^{*-}$ vector mesons in RHIC isobarcollisions (Zr+Zr and Ru+Ru) at $\sqrt{s_{\mathrm {NN}}}$ = 200 GeV. We observethe first non-zero spin alignment for $K^{*\pm}$ in heavy-ion collisions. The$K^{*\pm}$ $\rho_{00}$ is about 3.9$\sigma$ larger than that of $K^{*0}$. Theobserved difference and the ordering between $K^{*\pm}$ and $K^{*0}$ aresurprising, and require further inputs from theory. When comparing between theisobar and Au+Au collisions, no significant system size dependence in $K^{*0}$$\rho_{00}$ is observed within uncertainties.

Measurement of global spin alignment of vector mesons at RHIC