Complex scaling and residual flavour symmetry in the neutrino mass matrix

摘要

Using the residual symmetry approach, we propose a complex extension of the scaling ansatz on the neutrino Majorana mass matrix $M u$ which allows a nonzero mass for each of the three light neutrinos as well as a nonvanishing $ heta_{13}$. Leptonic Dirac CP violation must be maximal while atmospheric neutrino mixing need not be exactly maximal. Each of the two Majorana phases, to be probed by the search for $0 uetaeta$ decay, has to be zero or $pi$ and a normal neutrino mass hierarchy is allowed.