Signals for Virtual Leptoquark Exchange at Colliders
  We study the effects of virtual leptoquark exchange on charged current and neutral current processes at HERA, on di-lepton production at the Tevatron, and on quark pair production at LEP II. We present the areas of parameter space that can be excluded at these colliders by searching for deviations from Standard Model expectations. 
M.A. Doncheski and J.L. Hewett