Near-side Delta eta correlations of high-pt hadrons from STAR

Joern Putschke

Systematic measurements of pseudorapidity (Delta eta) and azimuthal (Delta phi) correlations between high-pt charged hadrons and associated particles from the high statistics 200 GeV Au+Au and Cu+Cu datasets will be presented. In previous measurements differences in the near-side Delta Eta correlation between central Au+Au and the lighter systems d+Au and p+p were observed, including an additional long-range near-side correlation in Au+Au collisions. With the increased kinematic reach and statistical precision in Au+Au and Cu +Cu systematic studies of the Delta eta widths and correlated yield dependence on centrality, pt of the trigger and associated particles will be shown. In addition measurements to characterize the properties of the additional long-range correlation in Au+Au will be presented and discussed within different possible physics scenarios.