Constraints on the Gluon Density from Lepton Pair Production
E. L. Berger, M. Klasen
Abstract
The hadroproduction of lepton pairs with mass Q and finite transverse momentum QT is described in perturbative QCD by the same partonic subprocesses as prompt photon production. We demonstrate that, like prompt photon production, lepton pair production is dominated by quark-gluon scattering in the region QT>Q/2. This feature leads to sensitivity to the gluon density in kinematical regimes accessible in collider and fixed target experiments, and it provides a new independent method for constraining the gluon density.
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