ǫ ′ / ǫ at the next-to-leading order in QCD and QED

We present a new calculation of the CP violation parameter ǫ′/ǫ. The results reported in this paper have been obtained by using the ∆S = 1 effective Hamiltonian computed at the next-to-leading order, including QCD and QED penguins. The matrix elements of the relevant operators have been taken from lattice QCD, at a scale μ = 2 GeV. At this relatively large… CONTINUE READING