Large proton and antiproton enhancement with respect to pions has been
observed at intermediate transverse momentum pTββ 2-5 GeV/c in Au+Au
collisions at RHIC. To investigate the possible source of this anomaly, the
production of Ο mesons and two particle angular correlations triggered by
mid-pTβ baryons or mesons are studied. We also present the first measurement
of proton and antiproton production at sNNββ=62.4 GeV in Au+Au
collisions, which aims to study the energy dependence of the observed baryon
enhancement.Comment: 7 pages, 5 figures, proceedings of Hot Quarks 2004 workshop, Taos
Valley, New Mexico, 18-24 Jul 2004,, to be published in J. Phys.