The short-lived K(892) resonance provides an efficient tool to probe properties of the hot and dense medium produced in relativistic heavy-ion collisions. We report measurements of K in √sNN=200GeV Au+Au and p+p collisions reconstructed via its hadronic decay channels K(892)*0→Kπ and K(892)*±→K0Sπ± using the STAR detector at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The K*0 mass has been studied as a function of pT in minimum bias p+p and central Au+Au collisions. The K∗pT spectra for minimum bias p+pinteractions and for Au+Au collisions in different centralities are presented. The K∗/K yield ratios for all centralities in Au+Au collisions are found to be significantly lower than the ratio in minimum bias p+p collisions, indicating the importance of hadronic interactions between chemical and kinetic freeze-outs. A significant nonzero K*0 elliptic flow (v2) is observed in Au+Au collisions and is compared to the K0S and Λ v2. The nuclear modification factor of K at intermediate pT is similar to that of K0S but different from Λ. This establishes a baryon-meson effect over a mass effect in the particle production at intermediate pT (2



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NOTE: At the time of publication, the author Thomas Gutierrez was not yet affiliated with Cal Poly.

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