Next-to-leading order short distance QCD corrections to the effective $ΔS = 2$ Hamiltonian, implications for the $K_L$-$K_S$ mass difference

Abstract

We report on the results of a calculation of next-to leading order short distance QCD corrections to the coefficient $η_1$ of the effective $ΔS = 2$ Lagrangian in the standard model and discuss the uncertainties inherent in such a calculation. As a phenomenological application we comment on the contributions of short distance physics to the ${\rm K}_{\rm L}$--${\rm K}_{\rm S}$ mass difference. This report is based on research work done in collaboration with Ulrich Nierste.