High-transverse-momentum hadron-hadron correlations in. sqrt. s = 38. 8 GeV proton-proton interactions

Measurements of correlations of nearly back-to-back hadrons produced at a large transverse momentum in ..sqrt..s = 38.8 GeV proton-proton collisions are presented and compared to previous results with a beryllium target. The correlations of identified unlike-sign hadron pairs in ratio to the correlation for all unlike-sign pairs are compared with predictions of the Lund model. These predictions differ from the data.