Abstract

One-loop corrections to the neutrino mass matrix within the MSSM with bilinear R-parity violation are calculated, paying attention to the approach in which an effective 3 x 3 neutrino mass matrix is used. The full mass matrix is block-diagonalized, it is found that second and third order terms can be numerically important, and this is analytically understood. Top stop loops do not contribute to the effective 3 x 3 approach at the first order, nevertheless they contribute at the third. An improved 3 x 3 approach that includes these effects is proposed. A scan over parameter space is made supporting the conclusions. (C) 2014 The Authors. Published by Elsevier B.V.