An upgraded analysis of $\varepsilon$'/$\varepsilon$ at the next-to-leading order

An upgraded analysis of \ep, x_d and \epp/\ep, using the latest determinations of the relevant experimental and theoretical parameters is presented. Using the recent determination of the top quark mass, m_t=(174 \pm 17) GeV, our best estimate is \epp/\ep= 3.1 \pm 2.5 , which lies in the range given by E731. We describe our determination of \epp/\ep and make a comparison with other similar studies. A detailed discussion of the matching of the full theory to the effective Hamiltonian, written in terms of lattice operators, is also given.