Supersymmetric corrections to $ε^\prime /εat the leading order in QCD and QED

Abstract

We study the corrections to $ε^\prime /ε$ in the minimal supersymmetric model at the leading order in QCD and QED. Supersymmetry can increase the standard model prediction for $ε^\prime /ε$ 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 $ε^\prime /ε$. For certain choices of supersymmetric parameters, vanishing and even small negative values of $ε^\prime /ε$ can be obtained for the top quark in the CDF range.