Dimuon Scaling Comparison at 44 and 62 GeV

Measurements of $\mathrm{pp}\to {\mu }^{+}{\mu }^{-}+X$ at $\sqrt{s}=44\mathrm{} \mathrm{and} 62$ 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 ${\mu }^{+}{\mu }^{-}$ 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.