Supersymmetric corrections to $\epsilon^\prime /\epsilon at the leading order in QCD and QED

We study the corrections to ${ϵ}^{\mathrm{\prime }}\mathrm{/}ϵ$ in the minimal supersymmetric model at the leading order in QCD and QED. Supersymmetry can increase the standard model prediction for ${ϵ}^{\mathrm{\prime }}\mathrm{/}ϵ$ by at most 40% for $m_t=174$ GeV, an enhancement which is indistinguishable from the present theoretical uncertainties. The most conspicuous effect of supersymmetry is a strong depletion of ${ϵ}^{\mathrm{\prime }}\mathrm{/}ϵ$. For certain choices of supersymmetric parameters, vanishing and even small negative values of ${ϵ}^{\mathrm{\prime }}\mathrm{/}ϵ$ can be obtained for the top quark in the CDF range.