K* production in Cu+Cu and Au+Au collisions at sqrt(s_{NN}) = 62.4 GeV and 200 GeV in STAR

We report the measurements of $p_T$ spectra of $K^{\ast }$ up to intermediate $p_T$ region in mid-rapidity through its hadronic decay channel using the STAR detector in Au+Au and Cu+Cu collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$= 62.4 GeV and 200 GeV. Particle ratios such as $K^{\ast }\mathrm{/}K$ and $K^{\ast }\mathrm{/}\varphi$ is used to understand the rescattering and regeneration effect on $K^{\ast }$ production in the hadronic medium. The $K^{\ast }$ $v_2$ measurement using a high statistics Au+Au 200 GeV dataset and nuclear modification factor measurement supports the quark coalescence model of particle production in the intermediate $p_T$ range.