Toward loop level study of supersymmetric models at future e^+e^- linear colliders

In the case with a large splitting between the squark and slepton masses, the supersymmetric identities which enforce the equality of the gauge and gaugino couplings are violated in the effective theory below the squark mass threshold. We compute the full one-loop (s)quark corrected slepton production cross-sections. We find that the one-loop corrected slepton production cross-sections can depend on the squark mass strongly, up to 9% *log_{10}(M_{\tilde{Q}}/m_{\tilde{l}}). We investigate the squark mass sensitivity of the slepton cross-section measurements at a future linear collider. For sneutrino production accessible at \sqrt{s}=500 GeV there can be sensitivity to squark masses at or larger than 1 TeV.