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K*0 production in Cu + Cu and Au + Au collisions at √sNN=62.4 GeV and 200 GeV

We report on K*0 production at midrapidity in Au + Au and Cu + Cu collisions at √sNN=62.4 and 200 GeV collected by the Solenoid Tracker at the Relativistic Heavy Ion Collider detector. The K*0 is reconstructed via the hadronic decays K*0→K+π− and K*0̅ →K−π+. Transverse momentum, pT, spectra are measured over a range of pT extending from 0.2 GeV/c up to 5 GeV/c. The center-of-mass energy and system size dependence of the rapidity density, dN/dy, and the average transverse momentum, 〈pT〉, are presented. The measured N(K*0)/N(K) and N(φ)/N(K*0) ratios favor the dominance of rescattering of decay daughters of K*0 over the hadronic regeneration for the K*0 production. In the intermediate pT region (2.0<pT<4.0 GeV/c), the elliptic flow parameter, v2, and the nuclear modification factor, RCP, agree with the expectations from the quark coalescence model of particle production.

STAR; 200GeV; K

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