We discuss polarized proton-positron scattering in the context of the excess
of large Q2 events at HERA. We define and estimate a polarized asymmetry to
examine two scenarios, the contact interaction and the stop scenario with
broken R-parity. This asymmetry exhibits a characteristic behavior depending on
the scenarios. Thus the polarized experiment at HERA will provide with a good
test for these models.Comment: 6 pages, 3 figures, PTPTe