K*(892) production in Au+Au collisions at RHIC

Short-lived resonances are useful tools to probe the property of the matter created in heavy ion collisions. Measurements of their production yields and elliptic flow allow us to understand particle production mechanisms as well as the system evolution after hadronization. We report the measurements of transverse momentum (PT) spectrum and anisotropic parameter v(2) of K* resonance from a high statistics data set of Au+Au collisions at root(NN)-N-s = 200 GeV taken by the STAR experiment in year 2004. The K* are measured up to intermediate PT region PT < 5 GeV/c at mid-rapidity through its hadronic decay channel. Its nuclear modification factor as well as elliptic flow are compared with corresponding results for K-S(0) and A up to intermediate PT to check the number of constituent quark scaling for resonances. Combined with the K*/K and phi/K* yield ratios, the production mechanism of K* is discussed. The first results on K* m(T) spectra from Au+Au 62.4 GeV are presented to understand the energy dependence of K* production.