Probing the Parton Densities of Virtual Photons at ep Colliders

Abstract

The feasibility of an experimental determination of the parton distributions of virtual photons at high energy $ep$ colliders is studied in the context of the DESY-HERA collider. Recently proposed parton densities of virtual photons are utilized to evaluate the appropriate production processes and their relevant kinematical regions. It is demonstrated that high $E_T$ jet production with $E_T\simeq 5-7\mathrm{GeV}$ and $b\bar{b}$ production can probe the parton distributions of virtual photons up to virtualities of a few ${\mathrm{GeV}}^2$. A useful leading order parametrization of our proposed photonic parton densities, suitable for further studies of these issues, is presented.

Comments: 23 pages, LaTeX, 6 figures, uses amssymb and epsfig styles