Perturbative renormalization of neutron-antineutron operators
Perturbative renormalization of neutron-antineutron operators
Two-loop anomalous dimensions and one-loop renormalization scheme matching factors are calculated for six-quark operators responsible for neutron-antineutron transitions. When combined with lattice QCD determinations of the matrix elements of these operators, our results can be used to reliably predict the neutron-antineutron vacuum transition time, ${\ensuremath{\tau}}_{n\overline{n}}$, in terms of basic parameters …