Measurements of pp-+n + n m +X at Vs = 44 and 62 GeV are compared. The data are taken under identical conditions utilizing clean proton-proton collisions from the CERN intersecting storage rings and confirm scaling to 5%. The observed JU + JT yield is a factor of 1.6 ± 0.2 larger than estimated from a simple parton model but is consistent with QCD. The p T dependence of the muon pairs agrees well with expectations from QCD.

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We report the results of a study of the mechanism of inclusive dimuon production from the reaction p+p p p, +X at the CEHN intersecting storage rings. The present experiment was done at the center-of-mass energies vs =62 and 44 GeV and in the dimuon pair invariant- mass region m =3—25 GeV. The dependence on the Feynman variable x has been measured. The average transverse momentum is found to increase with Vs and with mass and reaches (Pr)~ 1.9 GeV, compatible with predictions from quantum-chromodynamic gluon processes

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