Measurement of the Upsilon and Drell-Yan production Cross Sections at √s = 1.8 TeV using Dimuons.

Abstract

The production of heavy quarkonium in hadronic collisions is particularly interesting as a testing ground for QCD, in that both perturbative and non-perturbative QCD processes are important. Recent measurements of the J/ψ and ψ' cross sections at √s = 1.8 Te V indicate that our present understanding of these processes is incorrect by more than an order of magnitude. In this analysis, the ϒ cross section at √s = 1.8 TeV is extracted from 1992-93 dimuon data collected using the DØ detector at the Fermilab Tevatron. The differential cross section is found to be more than a factor of five higher than the O(ɑ³(s)) prediction over part of the PT range measured. The differential Drell-Yan cross section in the mass region from 6 to 35 GeV/c² is also extracted from the same data sample. The results of this measurement are in good agreement with the partial O(ɑ²(s)) prediction.