Eur. Phys. J. C (2015) 75: 99
https://doi.org/10.1140/epjc/s10052-014-3244-1

Regular Article - Theoretical Physics

Neutrino masses from SUSY breaking in radiative seesaw models

Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais 1, 1049-001, Lisbon, Portugal

^* e-mail: ajrf@cftp.ist.utl.pt

Received: 10 September 2014
Accepted: 22 December 2014
Published online: 28 February 2015

Abstract

Radiatively generated neutrino masses () are proportional to supersymmetry (SUSY) breaking, as a result of the SUSY non-renormalisation theorem. In this work, we investigate the space of SUSY radiative seesaw models with regard to their dependence on SUSY breaking (). In addition to contributions from sources of that are involved in electroweak symmetry breaking ( _EWSB contributions), and which are manifest from and , radiatively generated can also receive contributions from sources that are unrelated to EWSB ( _EWS contributions). We point out that recent literature overlooks pure- _EWSB contributions () that can arise at the same order of perturbation theory as the leading order contribution from _EWS. We show that there exist realistic radiative seesaw models in which the leading order contribution to is proportional to _EWS. To our knowledge no model with such a feature exists in the literature. We give a complete description of the simplest model topologies and their leading dependence on . We show that in one-loop realisations operators are suppressed by at least or . We construct a model example based on a one-loop type-II seesaw. An interesting aspect of these models lies in the fact that the scale of soft- effects generating the leading order can be quite small without conflicting with lower limits on the mass of new particles.